hydrogeology of the surficial and intermediate …...hydrogeology of the surficial and intermediate...

Hydrogeology of the Surficial andIntermediate Aquifer Systems in Sarasotaand Adjacent Counties, Florida

By G.L. Barr

U.S. GEOLOGICAL SURVEYWater·Resources Investigations Report 96-4063

Prepared in cooperation withSARASOTA COUNTY, FLORIDA, and theSOUTHWEST FLORIDA WATER MANAGEMENT DISTRICT

Tallahlilisce, Florida1996

I·····• .'.. '

U.S. DEPARTMENT OF THE INTERIORBRUCE BABBITT, Secretary

u.s. GEOLOGICAL SURVEYGordon P. Eaton, Director

.,

i!

Ir,}

f::!i!l!iit

I

~~

I

!

Any use of trade, product, or firm names In this publication Is for descriptive purposes onlyand does not imply endorsement by the U.S. Geological Survey.

For additional informationwrite to:

District ChiefU.S. Geological SUlVeySuite 3015227 North Bronaugh StreetTallahassee, Ronda 32301

Copies of this report can bepurchased from:

U.S. Geological SurveyBranch of Information ServicesP.O. Box 25286Denver, CO 80225-0288

_Cylene McPeeks - u.s Geolo~ical~ur:vey~R,!:p'.':t.~9~6~-4:::0~6~3:::.t~if P_a->9'-.-e_3 1

CONTENTS

Abstract 1Introduction _............................ 1

Purpose and Scope __ 2Description of the Study Area 2Previous Investigations 4Methods for Describing the Hydrogeology 5Acknowledgments 6

Hydrogeologic Framework 7Surficial Aquifer System 7Intermediate Aquifer System 10

Lithology and Age 10Areal Extent and Thickness 11Hydraulic;; Properties 12Geologic Faulting 12

Ground·W8tcrUse 13Ground-WaterQuality 13

Surficial Aquifer System 14Intennediate Aquifer System 15

Penneable Zone 1 15Permeable Zone 2 16Permeable Zone 3 16Carlton Reserve and South Venice Test Wells 17

Ground-WaterFlow 18Summary 18Selected References 20

Figures [Most figures B/e/ocated at the back of this report.]

1. Map showing location of the study area, ground-water quality study area, and test wells 32-4. Diagrams showing lithologic, hydrogeologic, and geophysical data at the:

2. Carlton Reserve test well 63. South Venice test well...................................................................................................................................... 74. Walton test wel1................................................................................................................................................ 8

5. Hydrogeologic framework in the study area 96. Map showing location of hydrogeologic sections in the study area 23

7·16. Hydrogeologic sections in southwest Florida:7. Section A-A' 248. Section B-B' 259. Section C-C' 26

10. SectionD-D' 2711. Section E-E' 2812. Section F-F' 2913. SectionG-G' 3014. Section H-H'..................................................................................................................................................... 3115. Section I-r........................................................................................................................................................ 3216. SectionJ-J' 33

17-22. Maps showing~

17. Generalized thickness of the surficial aquifer system in southwest Florida 34

Contents III

iI

18. Generalized altitude of the base of the intermediate aquifer system in southwest Florida. .19. Generalized thickness and extent of permeable zone 1 of the intermediate aquifer system in

southwest Florida .20. Generalized thickness of permeable zone 2 of the intermediate aquifer system in southwest Florida .21. Generalized thickness of permeable zone 3 of the intermediate aquifer system in southwest Florida .22. Generalized thickness and extent of the Venice Clay in southwest Florida .

23. Major pumping centers in southwest Sarasota County .24. Surficial and intermediate aquifer system ground-water quality monitor wells in southwest

Sarasota County .25-40. Maps showing:

25. Chloride concentration in water from wells open to the surficial aquifer system in southwestSarasota County _..•.._ ,

26. Sulfate concentration in water from wells open to the surficial aquifer system in southwestSarasota County .

27. Dissolved-solids concentration in water from wells open to the surficial aquifer system in southwestSarasota County ~ .

28. Specific conductance of water from wells open to the surficial aquifer system in southwestSarasota County ~ .

29. Chloride concentration in water from wells open to the intermediate aquifer system, permeablezone I, in southwest Sarasota County _ _

30. Sulfate concentration in water from wells open to the intermediate aquifer system, permeablezone I, in southwest Sarasota County .

31. Dissolved-solids concentration in water from wells open 10 the intermediate aquifer system,permeable zone I, in southwest Sarasota County .

32. Specific conductance of water from wells open to the intermediate aquifer system, permeablezone I, in southwest Sarasota County .

33. Chloride concentration in water from wells open to the intermediate aquifer system. permeablezone 2, in southwest Sarasota County _ _ .

34. Sulfate concentration in water from wells open to the intermediate aquifer system, permeablezone 2, in southwest Sarasota County .

35. Dissolved-solids concentration in water from wells open to the intermediate aquifer system,permeable zone 2, in southwest Sarasota County ..

36. Specific conductance of water from wells open to the intermediate aquifer system, permeablewne 2. in southwest Sarasota County .

37. Chloride concentration in water from wells open to the intermediate aquifer system. permeableZOne 3, in southwest Sarasota County .

38. Sulfate concentration in water ft:om wells open to the intermediate aquifer system, permeablezone 3, in southwest Sarasota County ..

39. Dissolved-solids concentration in water from wells open to the intermediate aquifer system,permeable zone 3, in southwest S8I1ISoIa County .

40. Specific conductance of water from wells open to the intermediate aquifer system, permeablezone 3, in southwest Sarasota County .

41-50. Graphs showing:41. Chloride, sulfate, and dissolved-solids concentrations in water from intermediate aquifer system.

permeable zone I, at the Englewood Water District well En 9, 1987-93 .42. Chloride, sulfate, and dissolved-solids concentrations in water from intermediate aquifer system,

permeable zone 2, at the Venice Gardens well field monitor well 9, 1985-90 .43. Chloride, sulfate, and dissolved-solids concentrations in water from intermediate aquifer system,

permeable zone 2, at the Plantation monitor well MW4, 1987-94 ..44. Chloride, sulfate, and dissolved-solids concentrations in water from. intennediate aquifer system,

permeable zone 2, at the Southbay Utility well PZ2, 1983-94 _ _.45. Chloride, sulfate, and dissolved-solids concentrations in water from intennediate aquifer system,

penneable zone 3, at the EWD RO Production well I, 1983-93 .46. Chloride, sulfate, and dissolved-solids concentrations in water from intermediate aquifer system,

penneable zone 3, at the Plantation monitor well MW3, 1987-94 .

IV Conllln"

35

36.(

37383940

41

42

43

44

45

46

47

I48 ,

49 !-50

51 I52 !

53

S4

ISS

56 !57

58

59

60

61

62

63

1

47. Chloride. sulfate, and dissolved-solids concentrations in water from intennediate aquifer system.penneable zone 3. at the Sarasota County Utility well PZ3. 1985-94 64

48. Chloride. sulfate. and dissolved-solids concentrations in water from intermediate aquifer system.permeable zone 3. at the Southbay Utility well PZ3. 1989-93 65

49. Chloride. sulfate. and specific-conductance values at selected depth intervals below land swfaceat the Carlton Reserve test well _ 66

50. Chloride. sulfate. and specific-conductance values at selected depth intervals below land surfaceat the South V~ce test well 67

51. Diagrams showing major-ion concentrations of water from the intermediate aquifer system at selectedintervals below land surface at the Carlton Reserve and South Venice test wells................................................... 68

52. Maps showing composite potentiometric swface of the intennediate aquifer system, Mayand September 1993 .••. 69

53. Section showing two-dimensional conceptual model of the intermediate aquifer system.southwest Sarasota County 19

54. Graphs showing water levels in the surficial, intermediate. and Upper Floridan aquifer monitor wellsat ROMPTR 5-2, January 1993 to December 1994 70

Table [Most tables are located at the back of this report.]

1. Summary of well records and hydraulic properties of the surficial and intermediate aquifer systemsat selected sites and areas in southwest Florida....................................................................................................... 71

2. Ground-water withdrawals from the surficial and intermediate aquifer systems at major pumping centers.southwest Sarasota County. 1992 13

3. Well records for ground-water sampling network and ground-water quality data in southwestSarasota County. 1993 76

4. Ground-water quality data collected with a pore squeezer at the Carlton Reserve andSouth Venice test wells. Sarasota County. 1992 80

CONVERSION FACTORS, VERTICAL DATUM, ABBREVIATED WATERQUALITY UNITS, AND ACRONYMS

Multiply

inch (in.)

inch (in.)cubic inch (inl)

fool (ft)

foot per day (ftld)

foot per day per fool [(ftld)/ft]mile (mi)

fool squared per day (Wid)

square mile (mi2)gallon (gal)

galIon per day (golld)gallon per minute (gallmin)

million gallons per day (MgaVd)

By

25.425,400

16.390.3048[.01.0

1.609

0.0929

2.590

3.7853.7850.063080.04381

To obtain

millimetermicrometercubic centimetermeier

meter per daymeter per day per meter

kilometermeter squared per daysquare kilometerliterliter per dayliter per secondcubic meter per second

Temperature in degrees Fahrenheit (Of) can be converted to degrees Celsius fC) as follows:

"C = 5/9 ("F - 32)

Contents V

C¥lene McPeeks - us G_e()logi~j_~~-=.e,-Y_R:.c:pccl.-.::9-.:.6_-4-.::0-.:.6-.:.3_.li_f _

SEA LEVEl: In Ibis report, "sea level" refers to the National Geodetic Vertical Datum of 1929(NOVO of 1929)-a geodetic datum derived from a general adjustment of the first-order level nelll of boththe United States and Canada, formerly called "Sea Level Datum of 1929,"

ABBREVIATED WATER-QUALITV UNITS

)lm micrometers

mL millilitersjJ.S/cm microsiemens per centimeter at 25 degrees CelsiusmgIL milligrams per liter

J.lgIL micrograms per liter

ACRONYMS

SAS Surficial aquifer systemlAS Intermediate aquifer system

PZl Intermediate aquifer system. permeable zone 1PZ2 Intermediate aquifer system. permeable zone 2PZ3 Intcnnediate aquifer system, permeable zone 3

UFA Upper Floridan aquiferCU SASlPZl Confining unit between gAS and PZl

CU PZIIPZ2 Confining unit between PZl and PZ2

CU n2JPZ3 Confining unit between PZ2 and PZ3CU PZ3/UFA Confining unit between PZ3 and UFA

EWD Englewood Wat<r DistrictFOS Florida Geological Survey

MCL Maximum concentration levelQWIP Quality afWater Improvement Program

RO Reverse osmosisROMP Regional Observation and Monitor-Well Program

SWFWMD Southwest Florida Water Management DistrictUSEPA U.S. Environmental Protection Agency

USGS U.S. Geological Survey

WRAP Water Resources Assessment Program

VI c.......

i·, "".'y

i,,

~I

~Cyle';e McPeeks=-U}; Geological SUrVeyRpt. 96-4063.tif

Hydrogeology of the Surficial and Intermediate AquiferSystems in Sarasota and Adjacent Counties, Florida

Pa.~ill

ByG.L. Barr

ABSTRACT

From 1991 to 1995, the hydrogeology ofthe surficial aquifer system and the majorpermeable zones and confining units of theintermediate aquifer system in southwest Floridawas studied. The study area is a 1,400-squaremile area that includes Sarasota County and partsof Manatee, De Soto, Charlotte, and LeeCounties. Lithologic, geophysicaL hydraulicproperty, and water-level data were used tocorrelate the hydrogeology and map the extenrofthe aquifer systems. Water chemistry wasevaluated in southwest Sarasota County todetermine salinity of the surficial andintermediate aquifer systems.

The surficial aquifer is an unconfinedaquifer system that overlies the intermediateaquifer system and ranges from afew feet to over60 feet in thickness in the study area. Hydraulicproperties of the surficial aquifer systemdetermined from aquifer and laboratory tests, andmodel simulations vary considerably across thestudyarea.

The intermediate aquifer system, a confinedaquifer system that lies between the surficial andthe Upper Floridan aquifers, is composed ofalternating confining units and permeable zones.The intermediate aquifer system has three majorpermeable zones that exhibit a wide range ofhydraulic properties. Horizontal flow in theintermediate aquifer system is northeast tosouthwest. Most of the study area is in adischargearea of the intermediate aquifer system.

Water ranges naturally from fresh in thesurficial aquifer system and upper permeablezones of the intermediate aquifer system tomoderately saline in the lower permeablezone.Water-quality data collected in coastalsouthwest Sarasota County indicate that groundwater withdrawals from major pumping centershave resulted in lateral seawater intrusion andupcooing into the surficial and intermediateaquifer systems.

INTRODUCTION

Demand for public, industrial, and domesticwater-supply is increasing in southwest Florida largelydue to an influx of new residents and increased development in coastal regions. In southwest Florida.ground water is the main source of potable water. In1992, a variety of community potable water systems,ranging from county-owned water systemB to independent businesses in Sarasota County were pennitted bythe Southwest Florida Water Management District(SWFWMD) to withdraw ground water. The SWFWMD also requires pennits by other independentbusinesses that withdraw ground water for agricultural, industrial. mining, and recreational purposeswhen the outside diameter of the well casing is 6-in. orgreater, total withdrawal capacity from any source orcombined sources is greater than or equal to 1 milliongal/do or the annual average withdrawal from anysource or combined sources is greater than or equal to100,000 galld (SWFWMD, 1994). Withdrawalsreported by these permined water systems rangedfrom hundreds ofgallons to more than 2 million gallons per month. Domestic homes and private companies do not require water·use permits when the outside

diameter of the well casings is smaller than 6-in. andwithdraws are less than threshold pumpage rates.

Ground water is withdrawn from three mainaquifer systems in Sarasota County and neighboringcounties: the surficial aquifer system (SAS),intennediate aquifer system (lAS), and Upper Floridanaquifer (UFA). Manatee County withdraws much of itspotable water from the UFA. Southern SarasotaCounty and counties to the south rely heavily on thesurficial and intermediate aquifer systems for theirpotable water. Umited supplies of potable groundwater can be pumped from thin layers of the SAS andthe upper two permeable zones of the lAS in thoseareas. Limited amounts of water can be withdrawnfrom these potable water zones because they are thinand have limited areal extent. Slightly saline to verysaline water is available in larger quantities from thedeeper permeable zones in the area. Slightly saline tomoderately saline water can be converted to potablewater by desalinization but at a relatively largeexpense. Because of the need for large quantities ofpotable water, 42 facilities for public water supplywere permitted for desalinization operations in theSarasota..charlotte County area in 1993; 19 of thefacilities produced more than 100,000 gaUd (MarkHanuuond, SWFWMD, oral commun., 1994).

The lAS has a series of penneable zo~ andconfining units. Water quality in the zones depends onthe hydrogeologic setting, flow dynamics, wellconstruction, and pumping stresses on the aquifersystem. The confining units of the lAS limitmovement of water between the various permeablezones. Many production wells are open to severalpenneable zones of the lAS, allowing for aninterchange of water with significantly different waterquality properties. Consequently, potable water inupper zones can be degraded by saline water fromdeeper permeable zones. Wells with corroded casingsalso can allow interchange of water among the zones.The withdrawal of ground water from productionwells near the coast increases the possibility of lateralseawater intrusion because of the proximity to theseawaterlfreshwater interlace at the coast Intensepumping of an upper permeable zone also can causeupconing of water with higher dissolved solids fromlower permeable zones.

A berter undersranding of the hydrogeology ofthe SAS and the lAS is needed to evaluate the effectsof pumping on the entire aquifer system. Because ofinsufficient hydrogeologic infonnation of the

individual permeable zones and confining units of thelAS, the potentiometric surfaces of the individualpermeable zones of the lAS and the UFA is not welldefined. In October 1991, the U.S. Geological Survey(USGS), in cooperation with the SWFWMD, began a3·year study to define the hydrogeology of the surficialand intermediate aquifer systems in Sarasota Countyand adjacenr counties (fig. I). In 1993, SarasotaCounty became a cooperator and the study wasexteoded through September 1995 and expanded toinclude an evaluation of ground-water quality andseawater intrusion along coastal Sarasota County,from Osprey to Englewood (fig. I).

Purpose and Scope

This report describes the hydrogeology of thesurficial and intermediate aquifer systems in southwestFlorida. focusing on the area where the Venice Clayexists. The hydrogeologic framework is based uponlithologic, geophysical, head, water-quality, andhydraulic property data from many existing wells andthree test wells constructed in Sarasota County duringthe study. Data from existing wells were from the filesof the USGS, SWFWMD, Floridll Geological Survey(FGS), Sarasota County Utility and WaterDepartments, and private consultants' reports.Ground-water quality and the potential for seawaterintrusion in coastal Sarasota County between Ospreyand Englewood were determined from water collectedfrom wells open to the SAS and lAS.

Description of the Study Area

The study area is about 1,400 mi2 and includesSarasota County and pam of Manatee, De Soto,Charlotte, and Lee Counties (fig. 1). The areal extentof the study area was selected by evaluating thehydrogeologic framework and defining the landwardextent of the Venice Clay, a member of a confiningunit in the upper port of the lAS. A smaller pari of thestudy area in southwest Sarasota County, betweenOspeey and Englewood and to the east in the geoeralvicinity of the Myakka River. was selected forevaluation ofground·wat:ei' quality, seawater intrusion,and a general discussion of ground-water flow.

The study area lies in parts of the Gulf CoastalLowlaods, the lagoons and barrier chain, and the DeSoto Plain, all minor divisions of the Florida ceotral or

i. ',"'"1:i1w::::n:i~,,

,

I

I'

2 Hvdrog.oIogy of the Surflcllli .nd Inblrtnedlllbt Aqua... SystelTlllln Baruotll and AdJ_nt Countln, FtorJda

Cylene McPeeks ~U~SGeol()j:l.lcal Survey Rpt 96-4063.tif J

82"15'

~,..~

i·IDESOTO

COUNlY

CHARLOTTECOUNlY

HARDEE COUNTY

LEECOUNlY

I,I

IL J------,I

o

-------------------------------t-------------------I

QROUND-WAlERQUAUTY STUDY AREA

•BOUNDARY OF STUDY AREA

EXPLANATION•S 1p MILES

5 10 KILOMETERS

WALroN leST WELL MID NAME

qo

Ba88 from U.S. Geological Survey digital data, 1:2,000,000, 1972Albers Equal-area Conic projectionStandard Parallel, 29"30' and 4''"30', central merldlan ·83"00'

27"00'

'7"30'

,.

Figure 1. Location of the study area. ground-water quality study area, and test wells.

Introduction 3

.

I

I

Cylene McPeeks - U.S Geological_Surv,-:::eyL:-:R:;:p=l.-=9::6_-4:-:0:.:6::3:.:.li.:-f _ I

4 Hydrogeology of the Surtlcial.nd Intermedr.te Aquifer Sysbtms In s.raaca mel AdJ-m Countl.., F1orld81

midpeninsula physiographic zone described by White(1970). Land-surface altitude ranges from sea levelalong Gulf coastal regions to over 100 ft above sealevel in southeast Manatee County. The area is characterized by gradually sloping plains and terracesfanned in shallow marine environments by advancesand retreats of the sea during Tertiary and Quaternaryperiods. Most inland areas are dry upland habitats withan assortment of palustrine forested. scrub-shrub. orpiJustrine emergent wetland habitats (U.S. Fish andWildlife Service, 1985). The area is marked withsprings and karst features including, sinkholes. depressions, and relict-sink: lakes.

Previous Investigations

Early reconnaissance reports ofFlorida before themid-1980's, which described geology or gronnd water inthe study area, reported the surficial or intermediateaquifer systems in geologic or hydraulic tenns. Theseproposed descriptioos and JllIIllClI for the surficia1 andintermediate aquifer systems as hydrogeologic unitswere acknowledged by the Soutbeas_ GeologicalSociety (1986). Tenninology for the SAS bas generallyundergone few changesand bas usually been called thenon-artesian aquifer. unconfined aquifer. water-tableaquifer, or the surlicial aquifer.

Descriptions of sediments of the lAS byinvestigators have undergone a progression ofterminology. Stringfield (1936, p. 131) combined theIAS with the Floridan aquifer in his investigation ofartesian water in Tertiary deposits of the southeasternStates and refened to both as "the nutin body ofwater,"1n 1966, Stringfield described the geology inFlorida and called the lAS the ''local artesian aquifers"of middle Miocene and younger aged sediments.Parker and others (1955, p. 189) defined the Hawthornand Tamiami Formations as the "Florida aquiclude."Peek (1958) completed the first detailed geologicstudy of Manatee County, noting that the HawthornFormation serves as a confining bed for the Floridanaquifer. Clark (1964) investigated the bydrelogicconditions near Venice, Fla., and caned the upperHawthorn sediments the ''first and second artesianaquifers," an early attempt to distinguish individualpermeable zones of the lAS.

Later, investigators began describing the lAS asan aquifer system with discrete permeable zones.Sutcliffe (1975), investigating the water resources ofCharlotte County, divided the Tamiami Fonnation and

other Miocene sediments into three discrete aquiferzones. The bydregeoiogy and water qoality of the threediscrete aquifer zone system of the Tamiami Fonnationand Miocene sediments were further described byJoyner and Sutcliffe (1976) for Sarasota County andpartS of Manatee, Hardee, De Soto, Charlotte, and LeeCounties. Geraghty and Miller (1974, 1975)investigated the hydrogeology of the "water tableaquifer" and the ''upper artesian aquifer" at the Vernawell field in northeast Sarasota County, thehydrogeology in centtal Sarasota County at theMacArthurtract (1981), and at Venice Gardeos (1985),wbere the lAS was tenned the "secondary artesianaquifer." Wolansky (1978) reported the hydregeologyof the unconfined aquifer in Charlotte County. InBrown's reports of the water resources of ManateeCounty (1981) and the Manasota basin (1982), becalled part of the lAS the "minor artesian aquifer." Inthe study by Sntc1i1fe and Thompson (1983), in theVenice-Englewood area, Sarasota and CharlotteCounties. the hydrogeology and water quality of fiveaquifer zones were described for the surficial,intermediate, and Upper Floridan aquifer systems.

A report by Wolansky (1983) describing thehydregeology of the Sarasota-Port Charlotte areadivides the Miocene and lower Pliocene sedimentsinto two hydrogeologic units called the lowerHawthorn-upper Tampa aquifer and the Tamiamiupper Hawthorn aquifer. These two hydrogeologicunits are called the "intermediate aquifers," andcorrespond to the upper two permeable zones of thepresent day lAS. In a study of the hydregeology of theVema well field in Sarasota County, Hotchiosnn(1984) also used Wolansky's terminology for theMiocene and lower Pliocene sediments of the lAS.Campbell reported the geology of Sarasota County(1985a) and De Soto County (1985b). A water sopplyand development study by Dames and Moore (1985)that included bydregeology ofcentral Sarasota County(Rin8ling-MacArthur Reserve) notes a "secondaryartesian aquifer" within the Hawthorn and TampaLimestone. Duerr and Wolansky (1986) reported thebydregeology and water quality in the surlicial andintermediate aquifers in central Sarasota County(Ringling-MacArthur Reserve).

Since 1987, the USGS bas published biannualpotentiometric-surface map reports of the lAS insouthwest Florida. Potentiometric surfaces arecontoured based upon Wolansky's (1983) twopermeable zones of the lAS. Reports sbow general

.,

'-I

[CylEme McPee.ks : u.s ~eOI()9iCal Survey Rpt. 96-4063:iiT---

head relations, but insufficient areal coverage and... composite·head data have resulted due to a paucity of

single permeable-zone head data. The first effort tomap the areal extent and upper and lower bounds ofthe lAS was in a study of the geohydrology and waterwithdrawals of the aquifer systems in southwestFlorida by Duerr and others (1988). Lithostratigraphicwork. by Scott (1988) lead to an accurateunderstanding of the Hawthorn sediments andsubsequent revision to group status. The SWFWMD(1990) presented ground-water quality results inManatee, Hardee, Hishlands, Sarasota, De SOlO, andCharlotte Counties of water samples from wells opento the surficial. intermediate, and Upper Floridanaquifer systems; all water-quality data from IAS wells,however. were reported as composite data becausesome wells were open to several permeable zones.Hutchinson (1992) assessed the hydrogeology ofsouthwest Sarasota and west Charlotte Counties, andreported on water quality of samples from springs andwells open to the lAS and Upper Floridan aquifer;some water-quality data were of samples from wellsopen to several zones ofthc lAS.

Infonnation about the hydraulic properties ofthe SAS and lAS was also obtained from reports byCH2M Hill (1978), Post, Buckley, Schuh, andJernigan (1981, 1982.. and 1982b}, and AJdaman andAssociates, Inc. (1992). Hydrogeologic and wellconstruction data from the SWFWMD RegionalObservation Monitoring Program (ROMP), WaterResoW'Ces Assessment Program (WRAP). Quality ofWater Improvement Program (QWIP), andinformation from the data·resources. water-use, andwell-permitting departments were also used.

Methods for Describing the Hydrogeology

Files of the USGS, SWFWMD, POS, SarasotaCounty, and consultants' reports were the Sources oflithologic, bydraulic, borehole geophysical, and headdata From all the well data available, 61 wells wereselected to evaluate the hydrogeologic properties ofthe SAS, Venice Clay, and the permeable zones andconfining units of the lAS in the study area.

The areal extent of the penneable zones of thelAS has not been determined. In 1992, the CarltonReserve and South Venice test wells were drilled bythe FOS to collect hydrogeologic data that could beused to provide benchmark information for the SAS,Venice Clay, and the lAS. The Walton test well was

______

drilled in 1991 by the USGS for geologicreconnaissance. At all three test wells (fig. I),continuous sediment and core samples were collectedusing split-spoon (upper 10 to 30 ft) and wire~line

techniques. The Carlton Reserve, South Venice, andWalton test wells were drilled to depths of 580,701,and 304 it below land surface. respectively. TheCarlton Reserve and South Venice test wellspenetrated the UFA, and the Walton test well wascompleted into the lAS. The Carlton Reserve test wellwas converted into a 4-in. monitor well with an openhole interval of 175 to 190 ft below land surface.Personnel from the FGS and USGS providedlithostratigraphic and paleontologic descriptions fromsamples collected at the test wells (Campbell andothers, 1993; Wmgard and others, 1995). The FGSconducted laboratory tests on selected cores of theCarlton Reserve and South Venice wells using falling~

head permeameters to dctennine vertical hydraulicconductivities. Borehole geophysical data werecollected at the three test wells by the USGS.

Correlation techniques were used. to constructhydrogeological sections across the study area. Thedata acquired during this study were used to constructisopach maps of the surficial, intennediate. and UpperFlorida aquifer systems. At the three test wells. depthintervals of hydrogeologic units were detennined andcorrelated with lithologic descriptions and signatureson the geophysical logs. Correlations subsequentlywere made with log data from other wells on thesection line. Head data from 15 ROMP sites and IFOS well were used to define the depth intervals forpermeable zones and confining units of the lAS;however. head data were interpreted with cautionbecause of well construction techniques and seasonalhead changes that occurred. during drilling periods thatsometimes exceeded 6 months.

Other well data used in the correlation ofhydrogeologic units included reliable lithologicdescriptions from core or cutting samples, geophysicallogs, and heads collected during drilling. Naturalgamma and electric logs were used to establishgeophysical profiles for the SAS and lAS. The mostcomprehensive data for defining the Venice Clay werefrom the Carlton Reserve, South Venice, and Waltontest wells, and from ROMP sites 22, TR 5-1, and TR7-2. Samples of the Venice Clay at these sites were agedated. by fossil identification. and mineral content wasanalyzed by x-ray diffraction in samples at the threetest wells. Selected data from the key wells. presented.

IntrodUction 5

- - -----------------. -- ------------------

NATURAL GAMMA·RAY ELECTRIC RESISTIVITY

,'>~~--:-:-

j~

",

':::.-~

~~ ::: VENICE CLAY

.~~~

.~--

~--:f-;-

y , ''I''COUNTS PER seCOND

UFA

PZ3

HYDROGEOLOGICUNrr

UTHOLOGY

~

~ ""~

~;,9 ...w..a:0w> 300~C0-WW~.. 400

uic::>

"~ 500

000

SEALEVEL

~ lAS confining unit

~ lAS r*nneable zona and number

D Sand

• Cloyl.1ft

• LimHW".

EXPLANATION

• eo-.[fJ Pho._[£] Chen

SAS Sut1lcl.. equiler systemPZ1 PenneatHzone 1PZ2 Penneable ZeN 2PZa Permeable zone 3lAS lmennedla.. aquifer systemUFA Upper Floridan aquifer

Figure 2. Uthologlc, hydrogeologic, and geophysical data at the Carlton Reserve test well.

in figures 2-4, include lithology, hydrogeologic unit.head, and borahole geophysical logs_

AcknoWledgments

The author gratefully acknowledges the supportof the SWFWMD and Sarasota County_ SarasotaCounty and the U.s. Army Corps ofEugineers allowedthe drilling of test wells on their propenies. Specialthanks are extended to the following individuals: FrankT. Manheim. USGS. for providing the core-squeezingapparatus and technical advice on sampling methods;

Amleto A. Pucci, Lafayette College, Baston, Pa., whoalso advised on core-squeezing, water sampling, andlaboratory analytical techniques; Roger Quick,Englewood Water District; Robert Money, PlantationUtility; Steven F. Park, City of Venice; and BettyThomas, Venice Gardens Utility, for providingproduction-well and water-quality data at the respectivewell fields; George Ulrich, USGS, retiree, whovoluntarily assisted in identifying lithologies at the test

wells. Thanks also are given to the many residents inSarasota County who allowed water samples to becollected from their wells. The author is grateful to

, Hydrogaology of the Surficial and Intermedlata AquHer IVII_ms In Sliruota and AcQacn Count.... Florida

Cylene McPeeks - U":~"Geolo\lical Survey ~t 96-4063.lif

UniOLOGY

SEALEVEL-r------.'

fOO«lJl200;09lli 300

g~ 400

iffi5000;

~600

~:i 700

HYDROGEOLOGICUNIT

$AS

PZ3

UFA

NATURAL GAMMA~RAY

100I

COUNTS PEA SECOND

ElECTRIC RESISTIVITY

~ lAS confining unit

~ lAS permeable zone end number

DSond• Clay/.II

• Umo._

EXPLANATION• DoI.._

W Pho4phale

~ Chort

$AS SUr1lcial aquifer ayal8mPZt Permeable zone 1PZ2 Pnneablezone 2PZ3 Permeable ZONI 3lAS Intennedlateaqulfef aysll8mUFA Upper Floridan aquifer

Figure 3. uthologlc. hydrogeologic, and geophysICal data at the South Venice test well.

Jonathan D. Arthur and Thomas M. Scott. FloridaGeological Survey, for their insightful comments andtechnical review of the Florida geology.

HYDROGEOLOGIC FRAMEWORK

The surficial and intermediate aquifer systems. aseries of unconsolidated and consolidated marinesediments from the land surface downward are morethan 700 ft thick in the study area. The hydrogeologicunits in these sediments range in age from Quaternaryto early Tertiary. The hydrogeologic framework of thestudy area i~ presented in figure 5. The locations of 10hydrogeologic sections are shown in figure 6 and thesections are shown in figures 7-16. A summary of well

records. vertical hydraulic conductivities, andhydraulic properties of the SAS and lAS are listed intable 1.

Surficial Aquifer System

The SAS consists ofpermeable, unconsolidated,clastic sediments and some locally consolidated basalcarbonates that range in age from Holocene toPliocene. The sediments are composed of fine tomedium quartz and phosphatic sand, clayey sand, clay,sandy clay, shells. limestone, and dolostone, andbecome increasingly phosphatic and clayey withdepth. Carbonate sediments usually are components ofdeeper aquifers. but when clay and confining materials

Hydrogeofoglc Framework 7

I Cyl~ne McPeeks - U.S Geological Survey Rp~3l.64_.::.06.::.3",._tif ~

HYDROGEOLOGICUTHOLOOY UNIT NATURAl GAMMA-RAY ELECTRIC RESISTIVITY

Page~~{]

~w>

I-~ilJi!i 100~'";Ii;!:",ggill

2005~.. ~~ 300

PZ3

~=..::=-VE.NICE CLAY

'00

o 100 200, . ,

OOUNTS PER SECOND

~ lAS confining unil

~ lAS penneabIe %OM and numbel'

o sand

• Claylollt

.u-tono

EXPLANATION_I0oס0.

0@] Chert

s~ Surldllll aquifer avr*fnPZ' Perrr.ablezone 1PZ2 perrneetjezone 2

pz.s P.~%anlt 3lAS 1n18rrnel:lll" aquifer systemUfA Upper ROI1dan aquifer

Figure 4. LIthologIc, hydrogeologIc, and geophysical data at the Walton test well.

are not present. the carbonates may be part of the baseof the SAS. The SAS is contiguous with land surfaceand extends to the top of laterally extensive andvertically persistent sediments of much lowerpermeability (Southeastern Geological Society,1986). Data collected during this study indicate thatthe SAS ranges in thickness from a few feet to morethan 60 ft (fig. 17).

Sediments of the SAS have a wide range ofhydraulic properties because of variations in grain sizeand texture. porosity, depositional environment, anddegree of fluid saturation. Previous investigationsshow the hydraulic properties vary considerablyacross the study area (table 1). Transmissivities fromaquifer tests at eight wells in Sarasota County range

from ISO to 1,800 tt"/d, and in western andnorthwestern Charlotte County from 1,340 to greaterthan 3,340 tt"/d (table I). Storage coefficients inSarasota County from aquifer tests at two wells in theCarlton Reserve and the Vema weli field 2E7 rangefrom 0.1 to 0.19. Horizontal hydraulic conductivityvalues from 15 wells in Sarasota County range from 2x 10-3 to 159 ftId and in western and northwestCharlotte County ranges from 47 to 60 ftId.

The water table of the SAS generally followsland-sUIface topography; however. the water tablevaries in altitude seasonally because of recharge fromprecipitation and the effects of pumping. The watertable is generally 0 to 5 itbelow land swface, and is at

Surficialaquifersystem

Hydrogeologic unitl

Surficial aquifer

General lithology

Ane to medium quartz and phospbaticsand, c1aJ<Y sand, limestooe,

clay. and shells

Rlssiliferous limestone and dolostone,clay, quartz """ pboophatic wuI,

and s • calcarious cia

Undifferentiated depositsTamiami Rmnation

Stratigraphic unit

Peace Ril'Cl" Formation"

Unconsolidated to weaklyindurated clastics

and marine deposits

Series

Hiocene

Holoceneand

Heistocene

System

Miocene Arcadia Inter-Formationl mediateHawthorn Fossiliferous limestone aquiferTertiaIY Group 2. 3 and dolostone, quartz and system

phosphatic sand, and clay

TampaUpper Member

OligoceneNocateeMember'

fussiliferous limestoneand dolostone, some Upper

Suwannee limestone! clay and qUllItz sand; Roridan aquifer FloridanLower some tIaces of phos- aquiferOligocene phate near top system

QuatemaIy

, Based on nomenclature of Southeastern Geological Society (1986).'Based on nomenclature of Soott (1988).'Based on age detennination by Covington (1993), Missimer and othera (1994), Soott and o!hera (1994),Winganl and othetS (1993), and Wmganl and others (1995).

Figure S. Hydrogeologic framework in the study area

.:; ..

land surface where surface-water bodies such as lakes,streams, and swamps exist.

Intermediate Aquifer System

The lAS "includes all rocks that lie between andcollectively retard the exchange of water between theoverlying surficial aquifer system and the underlyingFloridan aquifer system" (Southeastern GeologicalSociety, 1996, p. 5). Three llll\ior permeable zones arerecognized within !be study area (fig. 5). Penneablezones 1,2, and 3 (pzl,PZ2, PZ3), respectively, &reinthe upper, middle, and lower parts of the lAS. Thezones are distinguished as separate units byintervening confining units, and by differences inwater quality and water levels. The major permeablezones of the complex lAS may be thick sequences ofpermeable sediments, or successive layers ofpermeable and semi-permeable sediments thatfunction as a single hydrogeologic unit. Boundaries ofthe major permeable zones and their confining unitsalso may transverse cbronohorizons (sediments of thesame age). Some layers of clastic or carbonatesediments within major confining units are morepermeable and are capable ofproducing smallquantities of water to wells than other layers ofsediments; however, the layers may be thin or notareally extensive, and incapable of sustaining longtenn ground-water withdrawals.

Lithology and Age

Sediments of the lAS in the study area includefossiliferous limestone and dolostone, quartz andphosphate sand, clayey sand, clay, sandy clay, andchert, ranging in age from Pliocene to Oligocene(fig. 5). The relation between the stratigraphic andhydrogeologic units shown in figure 5 is developedbased on limited lithologic control in the study areaand is, the~·efore, subject to change with more data.

The confining unit below the SAS, the upperconfining uni~ is the top of the lAS (fig. 5). The npperconfining unit consists mostly of clay with varyingpereentagea of quartz and phosphatic sand, sil~

carbonates, and micro- to macrofossils, and sometimesdense,low-to-very-Iow-permeability carbonates.Permeable zone 1 lies below the upper confining unit(fig. 2) and consislB primarily of limestone, dolostone,and sand with varying percentages of quartz and

phosphatic sand, silt, clay, fossils, and accessoryminerals.

The confining unit below PLI consists primarilyof clay with varying percentages of quartz andphosphatic sand, silt, and accessory minerals, chert,

and low permeability sandstone and carbonates.Within this confining unit and sometimes composingthe entire confining unit (figs. 10 and 16) is the VeniceClay (fig. 5). The nameVenice Clay was probably firstused by Joyner and Sutcliffe (1976), and later bySutcliffe and Thompson (19g3), and Miller andSutcliffe (19g5) to describe a previously unnamed clayunit. No outcrops of the Venice Clay exist, butpresumably, below-water-surface exposures arepresent at about 50 ft below land surface in WarmMineral Springs in southern Sarasota County (about9 mi northeast of Englewood) where Pleistocene toMiocene sediments arc exposed along the open springvent wall.

For this study, the Venice Clay is defined as agreen to gray, magnesian clay composed of illitesmectite, sepiolite, and palygorskite with little or noquartz, phosphate, or carbonates. Due to samplingtechniques, previous descriptions may have includedmaterials in contact above and below the Venice Clay.The USGS conducted x-ray diffraction analyses ofVenice Clay samples from the Carlton Reserve, SouthVenice, and Walton test wells. Analyses showed thatthe primary components of the Venice Clay aremagnesian clays composed of illite-smectite, sepioliteand palygorskite, containing little or no carbonate orquartz (Lney McCartan, USGS, Reston. Va., wriuencommun., 1992). The Venice Clay possesses swellingproperties; several core samples collected at the SouthVenice test well expanded about two times the lengthof the collection interval upon removal from the corebarrel. Substantial amounlB of quonz, phosphate, andcarbonates were observed in sediments suprajacentand subjacent the Venice Clay. Mixing of the VeniceClay with these sediments during previous samplingcould explain earlier descriptions of the Venice Clayas being dolomitic.

Geophysical data can indicate lithologiccharacteristics of !be sedimenlB. Nalor1l1gamrna andelectric gcophysicallog data for 3 wells are given infigw"es 2 to 4. The Venice Clay is identified on thenatural gamma log at the area of low intensity. Naturalgamma radioactivity is relatively low (25-30 countsper second) in the Venice Clay because of low or nophosphate content

- 1

..i

I!

10 Hydrogeology of the Surflc181 and Intermlldlme Aquifer System. In Seruota and AdJacent Countle., Florlda

IC\"el1e McPeeks - U.S Geological Survey R..!?t~96-406.-,,3:.:.t:.cif _

Based on FOS and USGS evaluations afthecores from the Carlton Reserve, South Venice, andWaiton test wells and lithologic data from selectedwells, Scott (1992) proposed that the Venice Clay berecognized as a member of the Arcadia Formation,Hawthorn Group. The Venice Clay previously wasdefined as the basal part of the Tamiami Fonnation.Paleopalynologic evaluations of Venice Clay samplesfrom the Carlton Reserve, South Venice, Walton,ROMP 22, and TR 5-1 wells by Lucy E. Edwards(USGS, Reston, Va., written commun., 1994);Wingard and others (1993) reported the presence ofdinoflagellate assemblages that range in age fromearly or middle Miocene.

Permeable zone 2 underlies the confining unitthat contains the Venice Clay (fig. 5) and is composedprimarily of limestone and dolostone with varyingpercentages of quartz and phosphate sand, silt, clay,fossils, and accessory minerals. The confining unitbelow PZ2 is composed primarily of clay with varyingpercentages of quartz and phnsphate sand, sll~ anddense.low-to-very-Iow permeability carbonates.

Permeable zone 3 underlies the confining unitbelow PZ2 (fig. 5) and is composed primarily oflimestone and dolostone. and varying percentages ofquartz and phosphate sand. silt, clay. fossils. andaccessory minerals. The confining unit below PZ3. thelower confining unit, is the base ofthe lAS. The lowerconfining unit is composed of clay with varyingpercentages of quartz and phosphate sand. silt, anddense. low-to-very-Iow penneability carbonates.

Areal Extent and Thlckneaa

The lAS exists throughout the entire stody srea;however. some hydrogeologic units of the system arenot areally extensive. The lAS is thinnest in ManateeCounty and thickest in Lee County. ranging inthickness from 221 to 745 ft (figs. 7-16). The altitodeof the top of the lAS can be extrapolated from the SASthickness map (fig. 17); for example, where the SAS is20 ft thick, the top of the lAS is at 20 ft below landsurface. The bottom of the lAS coincides with the topof the UFA and ranges in altitude from less than 300 togrester than 700 ft below sea level (fig. 18).Structurally, the lAS and its associsted hydrogenlogicalunits have a gentle slope and dip one degree or lessgenerally toward the south in the study area.

Permeable zone 1is not extensive throughout thestudy area but exists in a part of western Manatee,southern and western Sarasota. and western Charlotte

Counties (fig. 19). Permeable zone I may exist ineastern Charlotte and Lee Counties. although the extentof it in those counties was not determined during thisstudy. This is generally the thinnest permeable zone ofthe lAS, averaging 80 ft or less (fig. 19). Wherepresent, PZl always overlies the Venice Clay.

Permeable zone 2 extends throughout the studyarea and beyond, ranging in thickness from 20 ft togreater than 190 ft (fig. 20); the zone is thickest ineastern and southern Sarasota. and eastern ManateeCounties. Penneable zone 2 is always below theVenice Clay.

Permeable zone 3 extends throughout most ofthe study area except in northern and eastern ManateeCounty (fig. 21); it probably extends beyond the stodyarea to the south. Thickness ranges from 0 feet incentral and western Manatee County to greater than300 ft in southwest Sarasota County. Permeable zone 3is generally the thickest permeable zone of the lAS inthe study area.

Upper, lower. and intervening confining unitsalways separate the permeable wnes of the lAS. Insome locations however. the various confining unitsmerge and function as a single confinittg unit (figs. 716). This condition is most prevalent in the northernpart of the srody area. where penneable zones narrowprogressively to extinction in Manatee County. Theresult may be very thick confining units between thinpermeable zones. The upper confining unit generallyis thickest in the southern part of the study area,ranging in thickness from about 5 to 150 ft. Variousmiddle confining units that separate PZI. PZ2, andPZ3 range in thickness from about 15 to 240 ft,depending on whether or not they merge with otherconfining units. Because the Venice Clay is animportant hydrogeologic unit, it is delineated as adiscrete unit within the study area. The Venice Clay isaconvenient marker bed that separates PZ1 from PZ2;the Venice Clay's slratignlphic poaition belps drillersto locate these zones. The Venice Clay occurs insouthern and western Manatee. Sarasota. western DeSoto and western Charlotte Counties. and probablyextends under the GulfofMexico (fig. 22). The VeniceClay ranges from 0 to 29 ft thick and averages aboutII ft thick. The lower confining unit, generallythickest in the southern part of the study srea andwhere it merges with middle confining units (figs. 7-9.16), ranges in thickness from about 10 to 240 ft.

Hydrogeologic Fralln.work 11

[C:Ylene McPeeks - us Geological Survey Rpt ~6:4".:-~06:::3~.t",if _

Hydraulic Properties

The lAS is a heterogeneous unit because oflocal variations in sediment composition anddepositional environments. and in the diagenetic(physical, chemical, and biological) processes thathave altered those sediments since they weredeposited. As a result of these variations, hydraulicproperties of the hydrogeologic units of the lAS varygreatly among and also within hydrogeologic units.Hydraulic properties of the lAS reported by previousinvestigators were sometimes determined from wellsthat were open to several permeable zones. Onlyvalues representative of discrete penneable zones andconfining units are given in table 1.

The principal hydraulic properties summarizedin table 1 for the permeable zones and confining unitsare transmissivity,leakance coefficient. storagecoefficient, and vertical and horizontal hydraulicconductivities. Some values of leakance coefficientsfor variow confining units arc given as values for apermeable zone reported by other investigators; theirintent was to report leakage away from the permeablezone. Permeable zone 1 has tI'ansmissivities rangingfrom 1,100 to 8,000 tt2/d, leakance coefficientsranging from 3.6 x Hr'to 1.2 x 10-1(ftId)/fl, andstorage coefficients ranging from 1.6 x 10-5 to 6.5 x10-4. Few hydraulic conductivity values are availablefor permeable material in any of the major permeablezones. except on the Carlton Reserve tract wherehorizontal hydraulic conductivity for two wells in PZlranged from 17'to 56 ftId; the wells were reported tobe SAS wells,_ but well construction data suggest thesewells are open to PZI. Permeable zone 2 hastransmissivities ranging from 200 to 5,000 'tt2/d,leakance coefficients ranging from 2 x 10-5 to I.! x10-3 (ftId)/ft, and storage coefficients ranging from 6 x10-6 to 6.2 x 10-4. Permeable zone 3 hastransmissivities ranging from 5,600 to 15.400 ft?/~

one reported leakance coefficienl of 3.5 x ur' (ftId)/fl,and storage coefficients ranging from 8.5 x 1O~5 to 6.4x 10-4. All hydraulic conductivity values for sedimentsfrom the three test wells constructed during the studywere delennined by the FGS using a falling-headpermeameter. Vertical hydraulic conductivity valuesfor confiniug material within PZI, PZ2, and PZ3 in thethree test wells ranged from less than 3.6 x urlO to 2.4x 10-3 ftId. Vertical hydraulic conductivity values ofthe various confining units between PZI. PZ2, andPZ3 ranged from I x 10-3 to less than 3.6 x 1(f1O ftId.The hydraulic conductivity values of less than 3.6 x

10-10 ftId noted above were from samples that did notsaturate in the penneameter after 31 days or more; thesediments have very low hydraulic conductivity, andthe values should be used with caution. Verticalhydraulic condUctivity for the confining units aboveand below penneable zone 3 at well TR 5-2 were0.1 ftId and 10 ftld, respectively, and were estimatedby model simulations (Hutchinson and Tromrner,1992).

Geologic Faulting

Geologic faulting has been reported in the lASand the UFA (Hutchinson, 1992) in southern parts ofthe study area and may have important implicationsfor ground-water qualily and movement in the lAS. Iffaulting extends into the lAS, results could include:I) breaks in confining units and direct paths forupward flow of ground water from lower permeablezones; 2) major permeable zones may be in directcontact with each other and water quality of onepermeable zone may he affected by the chemicalproperties of water in an adjacent permeable zone; and3) conduit flow may occur and natural ground-waterflow rates and directions may differ from estimatesderived from aquifer tests and model simulations thatassume porous media flow. Hutchinson (1992)presents evidence for an east-west fault extendingfrom the lower lAS to the base of the SuwanneeLimestone in southern Sarasota and northern CharlotteCounties. Based on observations during this study,faulting appears to extend into the upper parts of thelAS between the South Venice and TR 4-2 wells andnearby areas (fig. 7). The Venice Clay gently slopes inthe study area usually from 0.01 to 0.1 degree. Insouthern Sarasota COlUlty a slight deviation of theslope to about 0.3 degree between the wells may be anindication of faulting that extends to sballow depths.The South Venice well is on the down-thrown side.and the TR 4-2 well is on the up-thrown side of thefault described by Hutchinson (1992). The VeniceCay appears to he .t the expected depths. Data fromwells near TR 4-2. although not included in the sectionline.. were used to corroborate depths of the VeniceClay and showed inconsistency with the expected faultdisplacemenL Although not conclusive evidence, thedepths of the Venice Clay at these wells suggestadditional fault lines or more complex faulting hastaken place in the region north of Englewood.

r,,

12 Hydrogeology of the Surficial and Intermedla Aquifer ey_tlim. In Saruotll and AdJ-m Count.... Florida

!" C¥IElrle McPeeks - u.s Geological Survey Rpt. 96-4063.lif

GROUND-WATER USE

In coastal southwest Sarasota County, groundwater withdrawals from individual aquifers is reportedto the SWFWMD by major pumping centers andpermitted users, to aid the evaluation of water qualityand ground-water flow in that area. Ground water isprimarily used for domestic, agricultural irrigation,and public supply. A large part of ground-water use insouthwest Sarasota County is for public supply. Majorpumping centers are defined by this report ascommunity potable water systems that pumped50,000 galId or more. The water systems were either autility company with a consolidated network ofproduction wells. or a municipality with severaldispersed well fields. Many private wells used fordomestic supply in southwest Sarasota County pumpless than 50,000 gal/d" In 1992, there were four majorpumping centers in southwest Sarasota County thatproduced 50,000 gal/d or more from either the SAS orthe lAS for public supply (fig" 23 and table 2)"Average daily withdrawal rates for 1992 ranging fromabout 90,000 to 4,038,000 gal/d from these pumpingcenters are shown in· table 2 (SWFWMD, writtencommun., 1993). The ~or pumping centers, due todevelopment preferences and population density insouthwest Sarasota County. have been constructedwithin 5 mi of the Gulf of Mexico.

Table 2. Ground-water withdrawals from the surficial andintermediate aquifer systems at major pumping centers,southwest Sarasota County, 1992[Major pumpina: <:eIltcrI are COIII!DIIDl.ty potable WIteJ aupply I)'IteIDIwhere accumuJ.1llCd. JtOUI1d-water pumpage excccdcd so.ooo plJd in 1992.Withdrawal rates weM Mported as avaqc values (Southwest FloridaWIlIC:rMan~t District da1I. filea). SAS. surfldaI aquifer .yllem; lASPZi, intermedi.1IIe aquifer Iystem. permeabLe zone 1; lAS PZ2, iPtcnDedI..ate aquifer :syltem. pcrmcable zone 2; lAS PZ3. iutamedillle aquifer 1)'1tcm, penncable zone 3; lalId, Sa1kmlJ per day]

Englewood Water District:

..........Wcll field 1 SAS 93,000

..........Well field 1 lAS PZl 90,400

..........Well field 2 !ASPZl 103,100

..........Well field 3 !ASPZl 722.400

..........Well field 4 IASPZ3 1,655,300

Plantation Utility IASPZ3 278,900

City of Venice well Iield 1ASPZ2 27,000

IASPZ3 4.038,000

Venice Garden. Utility IASPZ2 268,100

IASPZ3 2,176,100

The SAS yields freshwater, which is usedprimarily for public and domestic supply, and lawnand agricultural itrigation. Because of lowtransmissivity of the SAS and because mostwells aresmall in diameter, withdrawal rates usually are lessth8Il 50 gal/min. If the wells are located close to thecoast, withdrawal rates are intentionally decreased toreduce the possibility of seawater intrusion. Use ofwater from the SAS varies among the communities inthe study area depending on the availability of otherwater sources. In Englewood and areas to the south,the SAS is used mostly for public and domesticsupply; north of Englewood, the SAS is used moreextensively for lawn and agricultural irrigation. Waterfrom the SAS usually requires treatment to removedissolved solids" The lAS yields larger quantities offreshwater than the SAS or the UFA, although theUFA yields larger quantities but with greaterconcentrations of dissolved solids in southwestSarasota County. Water from the lower part: of the lASis more saline than water in the upper part;consequently, community potable water systems andother public facilities use desalinization or reverseosmosis processes to treat the water.

GROUND-WATER QUALITY

Ground-water quality was evaluated in thisstudy over a lSS-mi2 area of coastal southwestSarasota ColDlty berw..n OSPleY and Englewood, andat the Carlton Reserve and South Venice test wells(fig" 1); this was done because of potential groundwater degradation from upconing-and lateral intrusionof seawater. Southwest Sarasota COlmty had asufficient number of wells in which water could besampled and evaluated from discrete permeable zones;other parts of the study area lacked the required datasites. Lateral intrusion of seawater in Florida's aquifersystems within this century has become a derivative ofcoastal metropolitan development, and SarasotaCounty is no exception. GrouIul-water withdrawalsfrom the lAS in the county also have caused upconingof saline water from the UFA. Ground-water flow inthe lAS in the study area at most times has an upwardflow componen~ and consequently, pumping from oneaquifer allows water in the next lower aquifer to moveup through the system at a faster rate. Deeperhydrogeologic units are the source of verticallyintnIded water containing higher dissolved-solidsconcentration.

Bround-Water QUlllty 13

I _-

r

~.'I.

I

]

iCytene McPeeks - u.s Geological Survey Rpt. 96-4063.tif Page20j

14 Hydroo-olagy of the SUrflol" and Inlltnnedlate Aquhr &y.-...ln s.ruata .nd AdJ_cent Countl... FICIf'imI

collected from cores dwing drilling of the test wells.The purpose of collecting the samples was to evaluateinterstitial water qUality in confining material and todemonstrate the capacity of a pore-squeezingapparatus to extrude water from sediments in Florida.The pore-squeezing technique aiuI apparatus used inthis study were adapted from techniques used in thepetroleum industry and described by variousinvestigators including Swarzenski (1959),Lusczynski (1961), Manheim (1966), Manheim andothers (19g5). Pucci and Owens (19g9), and Pucci andothers (1992).

The pore-squeezing apparatus used in this studyincluded a stainless-steel hollow cylinder (3 in. inlength by 2.5 in. in diameter) with matching piston,seals, gaskets, and a 0.45 JID1 filter. A small sedimeotsample, about 1.5 in3, was taken from the interior ofthe unconsolidated core material immediately uponremoval from the well bore, inserted into the cylinder,and pressed into the chamber by the piston. Amannal1y cranked bar-clamp was used to apply theforce needed to extrude interstitial water from the coresample in the apparatus into a polyethylene tube orcollector syringe. Volumes of water collected fromeach core sample ranged from 3 to 14 mL. Extractiontimes ranged from 5 to SO minutes.

Water samples were analyzed by the USGSOcala Laboratory for cations. anions, iron, strontium.nitrogen. hardness, specific conductance, pH, andalkalinity. No field measurements were made.Standard laboratory analytical procedures and inducedcoupled plasma/mass spectrometry methods wereused. Water samples were collected from eight coresamples at the Carlton Reserve test well and 6 samplesat the South Venice test well. Some analyses were notmade when limited volumes of sample water wereavailable; laboratory alkalinity and pH measurementswere perfonned only on water from the CarltonReserve test well. Alkalinity concentrations for theSouth Venice test well were not analyzed by field orlaboratory titrations, but were approximated bycalculating the difference between cations and anionsin milliequivalents per liter and converting tomilligrams per liter of calcium carbonate.

Most of the 26 SAS wells from which watersamples were collected produce water with chlorideand sulfate concentrations below U.S. Environmental

Surficial Aquifer System

250mgIL500mgIL250mgIL

secon.,. mulmumcontaminn level

Chloride

Dissolved solidsSulfate

Constituents that included chloride. sulfate, anddissolved-solids concentrations, and temperature, pH,and specific conductance nieasurements were used asprecursors to evaluate lateral seawater intrusion fromthe Gulf of Mexico and upconing of saline water fromthe UFA into the lAS. In order to characterize theground-water quality in southwest Sarasota Countybetween Osprey and Englewood. 96 wells open to theSAS, and-individual permeable zones and confiningunits of the lAS were sampled from June to November1993 (fig. 24).

Only water from wells open to discretepermeable zones as defined by this study was sampled.Well records and ground~water quality data for 96wells (26 SAS, 23 PZI, 28 PZ2, and 19 PZ3 wells) aregiven in table 3. Water samples from 85 of these wells,including five SAS wells drilled by the USGS using asolid-stem auger rig in areas where data were notavailable, were collected by USGS personnel Duringthe period June to November 1993, the USGS, usingpnxluction pumps, water taps, and portable centrifugaland submersible pumps, collected one water samplefrom each of the 85 wells. Water samples werecollected after 2 to 3 casing volumes of water wereevacuated and field measurements had stabilized.Field measurements included temperature. pH, andspecific conductance. Water samples were then sent tothe USGS Water-Quality Laboratory, Ocala, Florida,and analyzed for chloride, sulfate, dissolved solids,and nitrogen. Seleeled water-quality data for samplesfrom 11 wells, qollected and analyzed by privatesources, also were evaluated and are given in table 3.The water-quality data were evaluated with respect tosecondary maximum contaminant levels (SMCL) ofthe recommended secondary drinking-water regulations (U.S. Environmental Protection Agency, 1988)for chloride, sulfate, and dissolved solids as follows:

Water samples were collected from the lAS atselected intervals of clay within the major permeablezones and from the confining units between majorpermeable zones at the Carlton Reserve and SouthVenice test wells (fig. 24). The water samples were

ICyl~ne_Mc:Peeks - u.s Geological Survey Rpt. 96-4063.tif

Protection Agency (USEPA) recommended secondarydrinking-water regulations SMCL (figs. 25 and 26).About half the water samples eXceeded the SMCL fordissolved solids: all water samples analyzed exceptone have dissolved-solids concentrations greater thanor equal to 300 mgIL and specific conductancesgreater than 500 mgiL (fig. 27). Nitrogen'concentrations were also analyzed in water from wellsopen to the SAS. Nitrogen (NOz+N03) concentrationsfrom most samples were less than the detection limitof laboratory analytical equipment (less than0.02 mgiL). The pH of SAS water ranged from 4.8 to8.9. Water in the SAS is usually acidic due to contactwith carbon dioxide in the air and sediments; however,some SAS water is alkaline because of dissolution ofaccessory shell and calcium materials. Temperaturesof the water samples ranged from 23.6 to 32.4°C.

Wells within 2 mi of coastal or estuarineenvironments have concentrations of chloride, sulfate,and dissolved. solids that approach or exceed theUSEPA recommended secondary drinking-waterregulations. Water from wells in the study area morethan 2 mi from coastal or estuarine environmentsusually had chloride and sulfate concentrations withinthe recommended limits. Water samples from the SASin the centml region of the water-quality study areahad dissolved-solids concentrations less than500 mgIL. The dissolved-solids concentrations greaterthan 500 mgIL that were detected more than 2 miinland were in an area centered around major pumpingcenters that include the Englewood Water District,Plantation Utility. and the City of Venice well fields(fig. 27). Coastal aod estuarine areas occasiooally aresubjected to short durations of flooding by high tidesthat result in inundation by sea water with highdissolved-solids concentrations. Inlets. creeks, andcanals allow further contamination by seawater intoareas beyond coastal margins. Chloride concentrationson some barrier islands such as at the CaspersOnBeach well (fig. 25; index no. 10) may be less thanexpected due to local recl>arge. Detectable nitrite plusnitrate nitrogen concentrations (0.09 to 0.85 mgJL.table 3) in water from four wells may be due tofertilizers in inland areas. or natural concentrationlevels in coastal areas.

Intermediate Aquifer System

Ground water from wells tapping all permeablezones of the IAS is predominately calcium

bicarbonate, calcium sulfate. or sodium chloride type(Hutchinson. 1992), although water of other typesexists in the study area. Water from the lAS is slightlysaline with chloride and dissolved-solidsconcentrations generally increasing with depth. Waterin the lAS in most parts of the water-quality study areais not suitable for drinking without treatment becausethe water exceeds the SMCL for dissolved solids(USEPA, 1988).

Permeable Zone 1

Twenty-three wells open to PZI were sampledduring the study (table 3). The distribution ofchloride.sulfate and dissolved-solids concentrations, andspecific conductance measurements in PZ1 are shownin figures 29-32. Chloride concentrations ranged from45 to 1,520 mgIL. Sulfate concentrations ranged fromless than 0.2 to 1.200 mgIL. Dissolved-solidsconcentrations ranged from 431 to 3.410 mgIL.Temperatures ranged from 23.6 to 28.1DC. The pHranged from 6.6 to 7.8. Specific cooductances rangedfrom 674 to 5,250 lIS/em. Chloride conoentrationsexceeded USEPA regulations at five wells (index nos.103,107,164,168, and 169), sulfate at five wells(index nos. 90, 93,164,176, and 183), and dissolvedsolids for all wells except for three wells (index nos.97,105, and 188).

Wells at or near coastal and estuarineenvironments and major pumping centers generallyproduce water that exceeds USEPA regulations forchloride, sulfate, and dissolved solids (figs. 29-31).Water from PZI wells within 2 mi of coastal andestuarine environments usually exceeded USEPAregulations for chloride and sulfate; wells within 5 mihad dissolved-solids concentrations greater than500 mgIL. Water from PZl wells that were 2 mi ormore from coastal and estuarine environments hadspecific conductance measurements that were less than1,000 lIS/em; some of the highest specificconductance measurements (table 3) were in waterfrom wells at or near coastal or estuarine environments(fig. 32).

Chloride, sulfate. and dissolved-solidsconcentrations have been determined for watersamples from we11164 (EWD EPZ 9) since 1987(fig. 41). Although a variety of sampling techniqueshave been used by the Englewood Water Districtpersonnel over the years, the effects of varyingpumping rates are also apparent. Concentrations ofchloride, sulfate. and dissolved solids are relatively

Ground-W8ter Qu.1tv 15

I

stable when pumping rates are low, but increase duringperiods of increased pumping (Roger Quick. theEnglewood Water District, 0raJ. commun., 1993), suchas in 1991. Water from the area around the EWD wellfield generally exceeds the USEPA regulations forchloride and dissolved solids (figs. 29 and 31). In thearca of the Englewood Water District well fields, highchloride and sulfate concentrations probably resultfrom a combination of lateral seawater intrusion andupconing of saline water from deeper permeablezones.

High chloride, sulfate, and dissolved-solidsconcentrations in ground water from an area centeredat the Venice well field could be related to lateralseawater intrusion induced by pumping. Pumpingfrom PZ2 and PZ3 In the Venice well field (table 3)may also cause upconing of saline water that migratesinto PZl because of an upward hydraulic gradient

Permeable Zone 2

Moat of the 28 PZ2 wells evaluated and sampledare in the northern half of the study area; few wellsopen to PZ2 were available in the southern half of thearea. Chloride concentrations in water from thesewells ranged from 48 to 4,920 mgIL. Sulfateconcentrations ranged from 16 to 1.600 mgIL.Dissolved-solids concentrations ranged from 316 to10,300 mgIL. Temperatures ranged from 24.4 to27.5 ·C. The pH ranged from 6.5 to 7.7, Specificconductances ranged from SIS to 15,100 IlS/cm.Chloride concentrations exceeded USEPA regulationsat five wells (index nos. 56, 74, 108, 192, and 194,table 3 and fig. 33), for sulfate from all except 9 wells(index nos. 70, 97, 146, 15g, 182, 185, 187,197, and221, table 3, and fig. 33), and for dissolved.solids fromall except 3 wells (index nos. 182, 185, and 193, table3, and fig. 34).

Concentrations of chloride, sulfate, anddissolved solids generally are highest along the coastand at major pumping centers (figs. 33-35). Lateralintrusion of seawater probably takes place in coastalregions. Wells located more than 2 mi from coastal orestuarine environments generally have concentrationsof chloride, sulfate, and diasolved solids less thanUSEPA regulations. Maps showing COnoen1ratioDS ofwater-quality parameters indicate upconing of salinewater from PZ3 in the Venice well field.

High concentrations of dissolved solids ininland areas is due to the interchange of water amongseveral permeable zones through multiple-zone wells.

Water from many multiple-zone wells in the studyarea can have local or regional effects on waterquality. An example of possible local effect is waterfrom well 74 (table 3 and figs. 33-35) which hadhigher than expected concentrations of chloride.sulfate, and dissolved solids, and high specificconductance. A well with high dissolved-solidsconcentration, about 400 ft away from well 74, may beopen to PZ2 and deeper permeable zones, thusallowing saline water to enter PZ2 and into well 74.

Water quality at same pumping centers canfluctuate widely due to changes in withdrawal ratesfrom the pumping wells. Long-term concentrations ofchloride, sulfate. and dissolved solids in water fromthree wells open to PZ2 are shown in figures 42-44.We11loca.tions are shown in fig. 24. Increases inconcentrations ofchloride. sulfate, or dissolved-solidsconcentration in water from Venice Gardens (VO 9)and Plantation MW4 coincided with increases inpumping rates on one or more occasions. Data fromVO 9 (index no. 185, figs. 33-35) and MW4 (index no.182, figs. 33-35) indicate that water-quality changes ininland areas probably are the result of upconing ofsaline water from deeper aquifer units. At theSouthbay lftility well PZ2 (fig. 44) both latera1seawater intrusion and upconing probably areoccurring due to elevated wncentrations ofchloride,sulfate, and dissolved solids.

Perm8llble Zone 3

Nineteen wells tapping PZ3 were sampled in thenorthern half of the study area. Wells in the waterquality study area used for public supply commonlyare not completed in PZ3, except for those wells usedfor reverse-osmosis treatment and agriculturalirrigation. because the water has high concentrationsof sulfate and dissolved solids. Chlorideconcentrations ranged from 33 to 4,200 mgIL. Sulfateconcen1ratioDS ranged from 388 to 2,500 mgIL.Dissolved-solids concentrations ranged from 1.120 to7,700 mgIL Tempemturea ranged from 25.6 to28.4OC. The pH ranged from 6.4 to 7.s. Specificcondnctancea ranged from 1,347 to 10,370 flSIcm.Chloride concentrations in water samples exceededUSEPA regulations for drin1ring water for all exceptsix wells (index nos. 109, 112, 114, 123, 124, and 308,table 3 and fig. 37). Sulfate and dissolved-solidsconcentrations in water from an the wells exceededthe standan1s.

I..,

16 Hydrogeology of the Sut1klilll.,.d Intermed.... Aquifer ay.-..ln Baruotll and AdjMlent Counties, Florid.

l

iCylene McPeeks - U.S Geological Survey Rpt. 96-4063.lill_~~. ._ ._.~.._ ._~-~---. --"~--~-'--'---' '----~~~~

I

Water with the highest concentrations ofchloride and dissolved solids was generally from wellsin the southern part of the study area (figs. 37 and 39).However, sulfate concentrations were much lower inthe southern part of the area Specific conductance .measurements of more than 2,000 J.LS/cm werecornmon in water from wells in the study area(fig. 40); the disbibution of specific conductancefollowed the same pattern as concentrations ofdissolved solids.

Water in PZ3 has naturally higherconcentrations of chloride, sulfate, and dissolvedsolids than water in PZl and PZ2 in the study area.Pumping from PZ3 causes lateral Beawater intrusion incoastal regions and upconing from the UFA. resultingin increased mineral concentration. Plots of chloride.sulfate, and dissolved·solids concentration from 1983to 1994 for water from four wells open to PZ3 areshown in figures 45~48. In southern Sarasota County,chloride, sulfate, and dissolved-solids concentrationsin water from EWD RO Production well 1 (index no.147 in table 3 and figs. 37-39) generally increasedfrom 1983 to 1993. Pompag. from PZ3 at theEnglewood Water District well field 4 increased fromabout585 Mgalld in 1993 to about 1,358 Mgalld in1993 (a l32-percent increase). The increases inchloride, sulfate. and dissolved-solids concentrationsat the Englewood Water District RQ Production weillin late 1992 and early 1993= probably due to apumpage increase at the Englewood Water Districtwell field 4 from 1.4.Mgalld in September 1992101.9 MgaUd in January 1993 (EWD data files).Monthly fluctuations of chloride. sulfate, anddissolved-solids concentrations in water fromPlantation MW3 (fig. 46), Sarasota County UtilitiesPZ3 (fig. 47), and Soutbbay Utilities PZ3 (fig. 48) =similar to concentration changes in water from wellEWD RO I (fig. 45) and probably are related tochanges in pumping rates.

carlton -Ru.rve and South Venice Tnt Well.

Comparisons were made between chloride. sulfate, and specific conductance data for water samplesfrom the lAS at different intervals in each borehole(figs. 49 and 50). Major-ion diagtams for water samples from the Carlton Reserve and South Venice testwells are shown in figure 51 and the data are shown intable 4.

Water from the lAS at the Carlton Reserve testwell is a calcium bicarbonate type in the upper confin-

ing unit through the upper part of penneable zone 2. amagnesium bicarbonate type in the lower part of permeable zone 2, and a calcium sulfate type in permeable zone 3 through the lower confining unit (fig. 51).Water from the lAS at the South Venice test well is acalcium bicarbonate type iu the upper confining unitbetween permeable zones 2 and 3. a sodium-magnesium chloride-bicarbonate type in the lower part of theconfining unit between permeable zones 2 and3, and acalcium sulfate type in penneable zone 3 (fig. 51).

Chloride, sulfate, and hardness concentrations,and specific-conductance values generally increasedwith depth in the lAS at both test wells (table 4 andfigs. 49-51). At both test wells. chloride concentrations were below the USEPA SMCL in all evaluatedhydrogeologic units of the IAS. Whereas most sulfateconcentrations were below the SMCL in PZ2 andupper zones at both test wells. sulfate concentrationsof 270 and 280 mgIL were detected in water from theVenice Clay at the Carlton Reserve test well. Thehighest sulfate concentrations at both test wells weredetected in water at depths below PZ2. The higherchloride, sulfate, and hardness concentrations, andspecific conductance in the lower penneable zones canbe attributed to upward ground-water flow from theUFA at both test wells, and also to lateral flow due toproximity to the Gulf of Mexico at the South Venicetest well. Specific conductance measurements rangedbetween 920 and 2.120 J.1S/cm at the Carlton Reservetest well and 550 and 2,080 IIS/cm at the South Venicetest well; the highest specific conductance measurements were in water from PZ3 at both test wells(table 4 and figs. 49-51). Generally, the water isslightly acidic or slightly alkaline at the CarltonReserve test well and pH ranged from 6.3 to 7.9. Ironconcentrations were usually less than the USEPASMCL (0.3 mgIL) at both test wells, but wereLl mgIL in permeable zone 2 and 0.4 mgIL in thelower confining unit at the Carlton Reserve test well.Strontium concentrations, ranging from 1,200 to14,000 I'gIL at the Carlton Reserve test well, and 620to 13,000 I'gIL at the South Venice test well, increasedwith depth, but some exceptions were detected. Nitriteplus nitrate showed no discernible trend with depth;concentrations as nitrogen ranged from 0.14 to2.g mgIL at the Carlton Reserve test well and less than0.02 to 0.42 mgIL at the South Venice test well, andwere always below the USEPA SMCL (10 mgIL).

The chemical composition of water samplesfrom various depths in the two test wells was also com-

Ii."..

~C¥~neMcPeekS - u.s Geological Survey ~R~p~t:-;.9~6~-4:::0~6~3:.:.ti~f _ 1

pared to the composition of water from other wells taP"'ping the same hydrogenlogic units. Although theCarlton Reserve test well is slightly east of the waterquality study area (fig. 24), chloride, sulfate, and specific-conductance values for water from the CarltonReserve test well were similar to or slightly lower thanthe values for water from well 70 inPZ2 and wells 114and 124 in PZ3 (tables 3 and 4). Chloride, sulfate, andspecific-conductance values at the South Venice testwell were similar or slightly lower than values forregional PZI and PZ3 water (tables 3 and 4).

GROUND-WATER FLOW

Ground-water flow, described for the lAS in thestudy area, occurs under confined conditions.Horizontal ground-water flow through the lAS in thestudy area is generally from northeast to southwest, asindicated in the composite potentiometric surfacemaps in May and SePtember 1993 (fig. 52). Data usedto define head altitudes on the potentiometric mapswere from wells open to all or only parts of the lAS.The seasonal low (May) and high (September) waterlevel periods, typical for the study area are also sho~in figure 52. The potentiometric surface ftuctuates inresponse to hydraulic characteristics of the sediments,rechaIge, dischaIge, and pumping stresses. A rechargearea can be defined 88 that part of a ground-water flowsystem that has downward head. gradients. whereas adischarge area has upward head gradients. A twodimensional conCeptual model of the flow system,shown in figure 53, represents a discharge area of thelAS in southwest Sarasota County. All lAS confiningunits in the study area allow verticalleakance. Most ofthe study area is in the discharge area ofthe lAS.Some parts of the study area in Manatee, Hardee, andDe Solo Counties may be recharge or intermittentdischarge areaa of the lAS.

The lAS has vertical ground-water flow in thestudy area. An upward flow in the major permeablezones of the lAS results in hydraulic heads thatgenerally increase with depth in the study area. Thegeneral head relation between the SAS, lAS, and UFAat ROMP 1R 5·2 in Sarasota County is shown infigure 54. Head data from the wells shown in figurea2-4 indicate a gradual head increase in the lAS withdepth, and 80-' significant head increasea occurwhen major permeable zones are penetrated duringdrilling. Water-level relations hetween the SAS, majorpermeable zones of the lAS. and the UFA are not

completely understood in the study area due toinsufficient head data for discrete penneable zones ofthe lAS.

Water withdrawn from the lAS will probablyresult in changes in the chemical composition andavailahility of the ground water. The ability of groundwater managers to detect these changes can beenhanced by the use of numerical models. Conceptualground-water How models, used to design numericalmodels. may sometimes use simplified assumptionsabout the hydrogenlogy. IT the hydrogenlogy iscomplex, as in the case of the lAS in the study area,more complex assumptions should be employed. Thefollowing assumptions should be considered whennumerical models are used to evaluate ground-waterflow of the lAS in the study area:I. The lAS Is heterogeneous. Although this study

shows that a broad range of hydraulic propertiesexist for major penneable zones of the lAS. values reported by this and previous reports appearreasonable and could be used for modeling purposes.

2. Two or three major permeable zones of the lASexist in the study area. The lAS should be evaluated as a multilayer flow system.

3. Permeable zones 1 and 2 are only several tens offeet: thick in some areas; thus, pumping may havea greater effect on water-level drawdowns inthese areas. Models should be designed that consider the effects of ground-water withdrawalsmm~jm~~ingcenrenilimwi~w

50.000 gaUd or more.4. Major permeable zones of the IAS have unique

water chemistry. Different concentrations of dissolved solids in the zones are important if particle-tracking simulations are performed.

5. Adequate head data of major permeable zones ofthe lAS are lacking in the study area because ofnonuniform distribution of monitor wells. Observation wells outside the study area also areneeded for the collection of head data. Head dataare necessary fm evaluating model assumptions,boundary conditions, water budgets, and groundwater fluxes in and out of the aquifer units.

SUMMARY

Demand for ground water for public, industrial,agricultural irrigation. and domestic use has intensified the need to understand the hydrogenlogy of the

••••... '. . ~

18 Hydrogeology of the SUrftclal ...d Intllrmedl.- Aquifer Syat8ma In SUMOlll ...d AdJ8C8nt Countill.. F1or1d11

! CYI:~e-MCPeekS - u.s GeO-lo-g-ic-a-I-S-u-rv-e-Y-R-p-t.-9-?-.4-_0-_6-_3-._I~if_~~~~~~~~~~·~--------- --------=-P-ag-·e--zs-I

--~-0

I-

z

.....

..

..

-

II:

C

o

Z

::>-0

A E C H A R G E

~ ~ •..LAND SURFACE WATER TABLE········_-_··_--~~-_·· __ ·_····-AQUlFEa--_··-_·· __·_-Sy~_··_- ........ __ .

! INTERMEDIATE AQUIFER SYSTEM UPPER CONFINING UNIT --INTERMBDIATE AQUIFER SYSTEM PERMEABLBZONE 1

CONPI:NINO UNIT + VENICE CLAY

IN'TERMBDlATE AQUIPBR SYSTEM HORIZONTALPBRMEABLBZONB2 • fWW

~ I OONFlNINO UNIT

IHORIZONTAL• FLOW

INTERMBD1ATB AQUIFER SYSTEM

I'BRMEABLBZONB 3

~/

~..H:NTAL

LOWER CONFININGUNIT UPPER FLORIDAN AQUIFER

c

o

II:

...

.,Z

o

.. --

..

..

Figure 53. Two-dimensional conceptual model of the intennedlate aquHer system, southwestsarasota County. (The section is part of hydrogeologic section H·H', figure 14, from the Bay Indieswell to the Carlton Reserve test wei!.)

ICylene MCP_e~ks : u.s Geological Survey Rpt. 96-406~Ji~ ._.

surficial and the intermediate aquifer systems in southwest Florida. The surficial. intennediate, and UpperFloridan aquifers are the milin aquifer systems in Sarasota County and neighboring counties. In southernSarasota County and counties to the south, limitedsupplies of potable water can be pumped from thesurficial and intennediate aquifer systems.

An investigation was conducted in southwestFlorida from 1991 to 1995 to evaluate the hydrogeology of the surficial aquifer system and the major permeable zones and confining units of the intermediateaquifer system in a 1.400-square-mile area thatincludes Sarasota County and parts of ManalJ:e, DeSooo, Charlotte. and Lee Counties. Lithologic, ge<rphysical. hydraulic property. and water-level data from61 wells were uaed to correlate the hydrogeology andmap the extent of the surficial and intermediate aquifersystems in the study area.ln southwest SarasotaCounty, water chemistry was evaluated to detenninesalinity or saline character of the surficial and intermediate aquifer systems. Furthennore,. ground-waterflowwithin the major permeable zones of the intermediateaquifer system was described.

The surficial aquifer is an unconfined aquifersystem that overlies the intermediate aquifer systemand ranges from a few feet to over 60 feet in thicknessin the study area. Pliocene and younger surficial aquifer system sediments are composed mainly,of unconsolidated clastics and carbonates. Hydraulic propertiesof the surficial aquifer system determined from aquiferand laboratory tests, and model simulations vary considerably across the study area.

The intermediate aquifer system is a series ofPleistocene to Oligocene age sediments composed offossiliferous limestone and dolostone, quartz andphosphatic sand, clayey sand, clay, sandy clay, andchert. The intermediate aquifer system., a confinedaquifer system that lies between the surficial and theUpper Floridan aquifers, is composed of a1teroatingconfining units and permeable zones. The intcnncdiateaquifer system, a complex heterogeneous system, hasthree major permeable zones that exhibit a wide rangeof hydraulic properties.

The surficial aquifer system and major permeable zones of the intermediate aquifer system have distinct water-quality characteristics that range naturallyfrom fresh in the surficial aquifer system and upperpermeable zones of the intermediate aquifer system tomoderately saline in the lower permeable zone.Waterquality data collected in coastal southwest Sarasota

County indicate that ground-water withdrawals frommajor pumping centers have caused lateral seawaterintrusion and upconing into the surficial and intennediate aquifer systems.

Water-level data indicate that horizontal flow inthe intermediate aquifer system is northeast to southwest. Most of the study area is in a discharge area ofthe intermediate aquifer system. Data from this studyindicate an upward heatl gradient in the intermediateaquifer system, where heads increase with depth.

SELECTED REFERENCES

Ardaman and Associates, Inc., 1992, Geotechnicalevaluation. hydrogeological survey and groundwatermonitoring plan. Sarasota Central Landfill Complex,Sarasota County, Florida: Consultant's report in thefiles of Sarasota County.

Brown. D.P., 1981, Water resources of Manatee County,Florida: U.S. Geological Survey Water-ResourcesInvestigations Report 81-74,112 p.

--1982, Water resources and data-network assessmentofthe Manasota basin, Manatee and Sarasota Counties,Florida: U.S. Geological Survey Water-ResourcesInvestigations Repmt82-37, 80 p.

Campbell, K..M•• 198580 Geology of Sarasota County,Florida: Florida Geological Survey Open-File ReportIO,16p.

--198Sb, Geology ofDe Sato County, Florida: FloridaGeological 5IUVey Open-File Report II, 13 p.

Campbell, K.M., Scott, T.M., Green, RC., and Evans, W.L.m, 1993, Sarasota County intermediate aquifer systemcore drilling and analysis: Florida Geological SurveyOpen-File RepoIl56. 21 p.

CH2M Hill, Inc., 1978, Investigation of water aVailabilityfor proposed well field no. 3, the Englewood WaterDistrict: Consultant's report in the files of theEnglewood Water District, Sarasota County, Florida.

--1980. Drilling and testing of wells for reverseosmosis water supply: Englewood Water District:Consultant's report in the files of the Englewood WaterDiSUiet, Sarasota Couoty, Florida.

--1988, Drilling and testing of the deep injection wellsystem at North Port Charlotte, Florida: Consultant'sreport to the Florida Department ofEnvironmentalRegulation. file no. FCI5920.C2.

Clark, W.E., 1964, Possibility of salt-water leakage fromproposed iratracoasta1 waterway near Venice, Floridawell field, Florida Geological Survey Report ofInvestigations 38, 33 p.

Covington, J.M.• 1993, Eogeoe nanofossils of Florida inZUllo, V.A., Harris, W.B., Scott, T.M•• and Partello,R.W., eds., The Neogene ofFlorida and adjacent

-i' ,0.,'

i

I;

b,,;,,;:·

I

20 Hydrogeology at the Surficial and 1rd81'1Md1... Aquifer SyNma In s.ruotII.nd AdJac:.nt CountJ... F1ori~

r~~lleneMCPeekS- u.s Geolollical Survey Rpt. 96-4063 IiI

regions. Proceedings of the third Bald Head IslandConference on Coastal Plains Geology: Florida

- Geological Survey Special Publication 37, p. 43-44.

Dames and Moore. Inc.• 1985, Water supply developmentproject. Ringling-MacArthur Reserve: Consultant'sreport in the files of Sarasota County.

Duerr, A.D., Hunn, J.D.• Lewelling, B.R.. and Trommer,J.T., 1988, Geohydrology and 1985 water withdrawalsof the aquifer &ystems in southwest Florida, withemphasis on the intennediate aquifer system: U.S.Geological Survey Water-Resources InvestigationsReport 874259, liS p.

Duerr, A.D.• and Wolansky, R.M•• 1986, Hydrogeology ofthe surficial and intermediate aquifers ofcentralSarasota County, Florida: U.S. Geological SurveyWater-Resources Investigations Report 86-4068, 48 p.

Geraghty and Miller, Inc., 1974. A reconnaissance appraisalof the water potential of the upper artesian aquifer atthe Vema well field, Sarasota, Florida: Consultant'sreport in the files of Sarasota County.

--1975, Ground-water resources of the Vema wellfield, Sarasota, Florida: Consultant's report in the filesof Sarasota County.

--1980, Hydrogeologic investigation of the upperaquifer systems in the Venice Gardens area, Phase 1and Phase IT: Consultant's report to the FloridaDepartment of Environmental Regulation, file no.UOS8-116725.

--1981, MacArthur tract hydrologic and water-supplyinvestigation, Phase I: Consultant's report in the filesof Sarasota County.

--1985, Construction and testing of the injection wellat Venice Gardens: Consultant's report to the FloridaDepartment of Environmental Regulation, file no.UDS8-90S9S, 25 p.

Hutchinson, C.B., 1984, Hydrogeology of the Verna wellfield area and management alternatives for improvingyield and quality of water, Sarasota County, Florida:U.S. Geological Survey Water-ResourcesInvestigations Report 84-4006, S3 p.

--1992, Assessment of hydrogeologic conditions withemphasis on water quality and wastewater injection,southwest Sarasota and west Charlotte Counties,Florida: U.S. Geological Survey Water-Supply Paper2371, 74 p.

Hutchinson, C.B., and Trommer, J.T., 1992, Model analysisof hydraulic properties of a leaky aquifer system,Sarasota County, Florida: U.S. Geological SurveyWater-Supply Paper 2340, p. 49-62.

Joyner, B.P., and Sutcliffe, H., Jr., 1976, Watcrresourccs ofMyakka River basin area, southwest Florida: U.S.Geological Survey Warer-Resources InvestigationsReport 76-S8, 87 p.

Lusczynski, N.J., 1961, Filter-press method of extractingwater samples for chloride analysis: U.S. GeologicalSurvey Water-Supply Paper 1544-A, 8 p.

Manheim, F.T., 1966, A hydraulic squeezer for obtaininginterstitial water from consolidated and unconsolidatedsediments: U.S. Geological Professional Paper SSo-C,p.256-261.

Manheim, F.T., Peck, B.B., and Lane, C.M., 1985,Dctennination of interstitial chloride in shales andconsolidated rocks by a precision leaching technique:Society ofPetroleum Engineers JoumaI, October 1985,p.704-710.

Miller, R.L, and Suteliffc.lL,1r., 1985, Water-quality andhydrogeologic data for three phospbale industry wastedisposal sites in central Florida, 1979-80: U.S.Geological Survey Water-Resources InvestigationsReport 81-84, 77 p.

Missimer, T.M., McNeill, D.F., Ginsbmg, R.N., Mueller,P.A., Covington, J.M., and Scott, T.M., 1994, Cenozoicrecord of global sea level events in the HawthornGroup and Tamiami Formation on the Floridaplatform.: Abstract, Geological Society of America.Annual Meeting, Seattle, Wash., Program withAbstracts, p. A-1St.

MuIaroni, R.A., 1994a. Potentiometric surfacCi of theintermediate aquifer system, west-central Florida, May1993: U.S. Geological Survey Open-File Report 94-34,1 sheet.

--I994b, Poten1iometric surfaces of the intermediateaquifer system, west-antral 'Florida. September 1993:u.s. Geological Survey Open-Pile Report 94-80,1 sheet.

Parker, G.G., Ferguson, G.E., Love, S.K., and othen, 1955,Water resources of soutllcastern Florida. with specialreference to the geology and ground water of theMiami area: U.S. Geological Survey Water-SupplyPaper I25S, 965 p.

Peek, H.M., 1958, Oround~wal.er resources of ManateeCounty, Florida: Florida Geological Sunrey Report ofInvestigalions No. 18,99 p.

Post, Buckley, Schuh, and Jernigan, Inc., 1981, Aquifer testeoginoering report, The _on. Sarasota County,Florida: Consultant's report to the Florida DepartmentofEnvironmeola1 Regulation. file no. U058-109386.

--19828., Test of second 8rtesian and Floridan aquifers,City of Venice, Sarasota County, Florida: Consultant'sreport in the files of the City of Venice.

--1982b. F1nridan "Iuifcr test engineering report, ThePlantation, Sarasota County, Florida: Consultant'sreport in the files of the Plantation Utilities.

Pucci, A.A, and Owens, J.P., 1989, Geochemical variationsin a core ofhydrogeologic units near Freehold, New1ersey: Ground Water, November-December 1989,v.27,no.27,p.802~812.

8e1ees.d Refenncn 21

ICylene McPeeks -U.S Geological Survey Rpt. 96-4063.lil

Pucci. A.A., Ehlke, T.A.. and ·Owens, J.P., 1992, Confiningunit effects on water quality in the New Jersey CoastalPlain: Ground Water, May-June 1992, v. 30, no. 3,p.415-427.

Ryder. P.O., 1982. Digital model ofpredevelopment flow inthe Tertiary liD1C8tone (Floridan) aquifer system inwest-eentral Florida: U.S. Geological Survey WaterResources Investigations Report 81-54.61 p.

Scott, T.M.• 1988, The lithostratigraphy of the HawthornGroup (Miocene) of Florida: Florida GeologicalSurvey Bulletin 59, 148 p.

--1992, Neogene lithostratigraphy of the Floridapeninsula-problems and prospects: The third BaldHead Island Conference on Coastal Plains Geology,Abstract volume p. 34-35.

Scott, T.M., Wmgard, G.L, Weedman, S.D., and Edwards,LB., 1994, Rcintelprctation of the peninsular FloridaOligocene: A multidisciplinaIy view: Abstract,Geological Society ofAmerica, Annual Meeting,Seattle, Wash., Program with Abstracts, p. A-lSI.

Southeastern Geological Society, 1986. Hydrogeologicalunits ofFlorida: Florida Bureau of Geology SpecialPublication 28, 9 p.

Southwcat Florida Water Management District. 1990,Ground-water quality of the Southwest Florida WaterManagement District: Southern region: Brooksville,351 p.

--1994. Florida Administrative Code: Rules of theSouthwest Florida Water Management District,Chapter 400-2, Pan 2.041, Consumptive Use ofW_--Pcmrits Requirod, p. 2-2.

Stringfield, V.T., 1936, Artesian water in the FloridaPeninsula: U:S. GeologicalWater-Supply Paper 773-C,p.115-195.

__ 1966. Artesian water in Tertiary limestone in thesoutheastern States: U.S. Geological SurveyProfessional Paper 517, 226 p.

Sutcliffe, H.• Jr., 1975. Appraisal of the water resources ofCharlotte County, Florida: Florida Geological SurveyReport of Investigations 78, 53 p.

Sutcliffe. H., Jr.• and Thompson, T.H., 1983, Occurrenceand usc of ground water in the Venice-EngJewood area,Sarasota and Charlotte Counties, Florida: U.S.Geologico! Survey Open-File Report 82-700, 59 p.

Swanenski, W.V., 1959, Determination of chloride in waterfrom core samples: American Association ofPetroleum Geologists Bulletin. v. 43, no. 8, p. 19951998.

U.S. Environmental Protection Agency, 1988, Secondarymaximum contaminant levels (section 143.3 of part143, National secondary drinking-water regulations):U.S. Code ofFedenlJ. Regulations, TItle 40, parts 100t~149. revised as of July I, 1988, p. 608.

U.S. Fish and Wildlife Service, 1985, Wetlands anddeepwater habitats of Florida: U.S. Fish and WildlifeService National Wetlands Inventory, 1 sheet.

U.S. Geological Survey. 1984, Aquifer test at ManateeJunior College, Venice, Florida: U.S. GeologicalSurvey Open-File Release. in files of the U.S.Geological Survey. Tampa, Florida.

--1986. Aquifer test at ROMP 'fRS-2, SarasotaCounty, Florida: U.S. Geological Survey Open-FileRelease, in files of the U.S. Geological Survey,Tampa,Florida.

White, W.A., 1970, The geomorphology of the FloridaPeninsula: Florida Bureau ofGeology Bulletin 51,164p.

Wingard, G.L., SUgarman. PJ., Edwards, L.E., McCartan,L.E., and Feigenson, M.D., 1993, Biostratigraphy andchronostratigraphy of the area between Sarasota andLake Okeechobee, southern Florida: An integratedapproach: Geological Society ofAmerica, Abstractswith programs, v. 25. no. 4, 78 p.

W"mgard, G.L., Weedman. S.D., Scott, T.M., Edwards, L.a,and Green, R.C., 1995, Preliminary analysis ofintegrated stratigraphic data from the South Venicecoreho1e, Sarasota County, Florida: U.S. GeologicalOpen-File Roport 95-3,129 p.

Wolansky, R.M., 1978, Feasibility of water-supplydevelopment from the unconfined aquifer in CharlotteCounty, Florida: U.S. Geological Survey Water·Resources Investigations Report 78-26, 34 p.

--1983, Hydrogeology of the Sarasota·Port Charlottearea, Florida.: U.S. Geological Survey Water-ResourcesInvestigations Report 82-4089, 48 p.

Wolansky, R.M., and CorraJ., M.A., 1985, Aquifer tests inwest-eentraI Florida, 1952-76: U.S. Geological SurveyWater-Resources Investigations Report 84-4044,127p.

i·•

22 Hydrogeology of IhIISurtlcill .,d Inlllrmed.... Aquhr SysIarM In kasota and AdJacent CountJe.. Florldli

ICylene McPeeks - U.S Geololjical Survey Rpt. 96-4063.lil

Figure 8. Location of hydrogeologic sections In the study area.

,

I

I:,':'i>,

w-588.5

J'HoI!

CHARLOTTE314 COUNTY

C ' 1R 1-20'

HAROEE COUNlY

MANAlEE COUNTY

_.....\"'~;;;;,:;--!',;w, 13727

0'DE 801'0 COUNTY

H'ROMP 11

-~-----------------------------t-------------------,I

5 19 MILES10 KllOMETERS

A

5

EXPLANATlON ~~a 0

.Jl..A' HYDROGEOLOGIC SECTlON UNE 1'" \\'IR 3-3 WELL AND NMlE »\\JI

~qo

Base from U.S. Geological Survey digital data, 1:2,000,000, 1972Albers Equal·area Conic projectionStandard Parallelt 29030' and 4S031Y. central meridian -83W

26"30'

Flgu,.. 23

Icyiene_ r.1~Peeks - u.s Geological Survey Rpt 96-4063.lil

., "" ~:0 :0r;; ~w .. ~z o! ~~ ., g,g " ;;:

'" !~w ;j ~,l! :0

~e ~ 'I g e~ iii m ;;; ~

~ ~ ~!" ~ ~~

" ~

FIgure 7. Hydrogeologic section A-A: In southwest Florida. (line of section is shown In figure 6.)

24 Hydl'Ogllology of the Surficial end Inlitrmedlate Aquifer By-.- In 8111'l1*Ota Mel AdJ_nt Count.., florid.

A

~ "~

";;; 0

FEET ~ ~100

SEALEVEL

100

200

300

400

sao

600

700

800

III Surficial aquifer system

Intermeclate aquifer system

o Confining lA"IIt

• Venice Clay

• Permeablezone 1

• Penneablezone 2

• Permeable zone 3II Upper Floridan aquHer. - - Estimated

VERnCAL SCALE GREATlY EXAGGERATED

EXPLANATION

Data used for interpretation:(1) Uthologlc log

(2) Garrwna log(3) E1eclric log(4) Head

~ A'

"~. g,"g,g ~ ~ig~I§ ~ "

,~i,~

!i~:0

<is ."~ ~

1!l

o 5 10 MILESI 'o 5 10 KILOMETERS

S S'..-" ~

~ £ ..-± " ::-

a ::. z ~ ~;;:~ i

:;:z

~;; iii £ 0z tiw ~ g ..- 0

z '8 ~~ 'r " w

~'i § ~~

!!1.8~ tl !l! ~

~

" ",,,, '" "z

II I !!1. z ::- N !!1.

~!!1. wg N

~ "~

m ~ ~~

0 I< ~ ~z

~FEET ~ " .. 10 ~ ~100

SEALEVEL

100

200

300

400

500

600

700

____P_a"""gtiii]

I..VERTICAL SCALE GAEAnY EXAGGERATED

o 5 10 MILES

EXPLANATION 01-1-'5-""'~~-KJ-LOM-...JE'm.s

III SurficiBI aquHer system

Intennedlate aquifer II)'St8m

D Confining unit

• Venice Clay

• Permeabl8 zone 1

• Permeable zone 2

• Permeable zone 3• Upper floridan aqulet• - - Ee1lrnated

Data UHd for interpretation:

(1) UIhoIogIc log

(2) Ganvna log(3)El_1og

(4) Head

FIgure 8. Hydrogeologic section B-B' In southwest Florida. (Une of aectlon Is shown In figure 6.)

Figure. 25

C g~

~ "'I

f'" '"[z

~Q

"b i " '"w g z w £ . ~z Q !2

~,:I: b ~ a z "g z

8!g~ og, Qw

'" z

iiil iI!!- W!l!'~ l!!- ii'

~a:

I[~~N

I::>

N N

~~.. ;:;'" a:

1i'Jj~ If '" I:a: ..100 ) (PZl

SEALEVEL

100

200

300

400

500

600

700

800

C'I.

~I!

Figure 9. Hydrogeologic secUon C-C' In southwest Florida. (Une of section Is shown In figure 6.)

26 Hydrogeology of th. Surflclal and Intermedblle Aquifer Syatam.ln a .....ota and Adjacent Countie.. Florldll

5 10 KILOMETERS

Data used for Interpretation:

(1) LIthologic log

(2) Gamma log(.)e_1og

(4) Heed

EXPLANATION

VEAnCALSCALE GREAllY EXAGGERATED 0 5 10 MIL.ES1-1~~~--"o

III Surficial aquifer system

Intermediate aquifer sy8Iem

D Confining unit

• Venice Clay



• Perrneable zone 3

II1II Upper AorIdan aquiferEstImated

[c-yiene McPeeks - U.S Geologic~1 Survey Rpt. 96-4063.lil

o

100

SEALEVEL

100

200

300

400

'00

eoo

700

800

0'

" ~,;;

~ E "e~

~~ Ls ~

b s: z

=- !! ~i8 ~!~ §"~ ~ t o~IO !! =-..

~19 j~ia! ~ ~'" WI;!Ii! Iw 2 '"1O

l>-

I...

• Surficial aquifer system

Intermedia18 aquifer system

D Coofining unit

• Venice Clay

• PermB8blezone 1

• Permoablezone 2

• Permeablezone 3

• Upper Floridan aquifer• - - Estimated

EXPLANATION

Data used for Interpretation:

(1) LithoIoglc log

(2) Gamma log(3) EleclrIc log(4) Head

i;

Figure 10. Hydrogeologic section [).O' In southwest Florida. (Une of section is shown In flgure e.)

Figuru 27

iCylene McPeeks - u.s Geological Surv~y~R~p:.'.:t....::9~6=-4'.':O~6::.3.~tif~ P",""ag,,""ec...3",""4~1

~~

l

Data used lor Interpretation:

(11 UIhologIc log(2) Gamma log(3)E-.1og

(4) Head

EXPLANATION

VEA.TICAL SCALE OREATLY EXAGGERATEDo 5 10 MILES1-1-...,,-'-'--.,-~,o 5 10 KILOMETERS

III Surficial aquifer Syalem

Intermediate aquifer Iy8tem

o ConfIning unit

• Vonk:o Clay


• Permeablezone 3

l1li lJl>per Rorldan_,. - ~ Estimated

100

200

300

400

E E'

~

~ '"c" c ~

e ~ 00;:

~ ~ g Qe

~z

0 z

~SQ z

~ §()

t; ~ w

I!i '" !!!. !!!.

~c

~ N l:l'" ~

~..

~ ~

"w I!: I!: '" li!FEET .. "'00

SEALEVEL

Figure 11. Hydrogeologic section E·E' In southwest Florida. (Wns of section Is shown In figure 6.)

LC:;l'leneM~£,~eks--u.S Geological Survey Rpt. 96-4063.lil 1

D Confining unit

• V.... CIay



• Permeable zone 3• Upper FIol1dan aquifer. - - Estimated

•!VERTICALSCALEGREATLYEXAGGERATED 0 5 10 MILES

EXPLANATION 1-1__.,1_--'1'--,.--__-'1o 5 10 KILOMETERS

Data used lor Interpretation:(1) U1hologlc log

(2) Gamma log

(3) EIectr1c log(4) Head

Surficial aquifer system

IntermedIate aquifer system

300

BOO

400

500

F P

~:; "1"I '""I '" ~

3c

'" ;;: <I

~ '" ~.. zis

~is § §: .lg w

§ !rlw :I: 8iw e

w e 0 li§ ;;;e '" e ~z~

N

~ :z~

i!l; ~

Ii' w '"II: II: i'i ':I: 0FEET '" '" '" !o II:

100

SEALEVEL

100

200

Figure 12. Hydrogeologic section F~P in southwest Florida. (Una of section Is shown in figure 6.)

Figu.... 28

.Cylene McPeek. - U.S Geological Survey Rpt. 96~063.tif

G ;;:g ;;:

~

'1: "c

z C~ '" Q z

"-~ ~

~

iii'!< .. !!!.z z ~ !!!.Q Q <Ii rt;

~ ~~ g' . If

rd. !!!. !\: ~18~"- ~ blWlii

~ ~ i.. I:~ ~" !~~ ~ :>il' ~

FEET100

SEALEVEL

100

200

300

400

soc

BOO

G'

.1

VERTICAL SCALE GREATLY EXAGGERATED

EXPLANATIONo 5 10 MILES

OrI ---,--~..., .".-=-"

5 10 KILOMETERS

Cata used tor InterpretaUon:

(1)~log

(2) Gamma log

(3) EJecIrI, log

(4) Head

• SUrficll!ll aqulrer syatem

Intermediate aquifer system

o Confining un"

• _Clay

• Penneablezone 1

• Pannaabla ""'" 2

• Pannaabla""'" 3

• Uppa' FIooldan .."fer· - - Eatlma1ed

figure 13. Hydrogeologic 8ectIon G..Q' In southwest Florida. (Une of section', shown In figure e.)

30 HydrDgflOlogy or thII SurfloiaJ -.c:Ilnaermed'-te AquIfer SyMems In 8aruotIi and AdJllCllnt CounUH, FktlldII

[C~lene McPeeks - U.S Geological Survey Rpt. 96-4063.tif.~~~~

Figure 14. Hydrogeologic section H-H' in southwest FlorIda. (Une of section Is shown In figure 6.)

o 5 10 MILESI .', 'o li 10 KILOMETERS

Data used for interpretation:

(ll LItholo<Jc log

(2) Gamma log

(3)E_clog

(4)H....

EXPLANATIONVERTICAL SCALE GREARY EXAGGERATED

• SUrflclat aquifer system


o Cooflnlng unJt

• Venice Clay


• Permeablezone 2


• Upper Aorldan ~lfer0_- Estimated

H ; H'~ "@:., .. ".. g N

~ § ~ ~

z ii ~§ w ~ !rl ;

~~ '"

~!i: ww'" ~

.~~ !2 w z'" '" '" '" ~ >::.w !5 z " 3J 0 ::i5 g .,

~~ w ! w ..w

~0 "FEET ~ § 0 0CJ '"100

ICylene McPeek~ ::...~.S Geological Survey Rpt. 96-4063.tif

i~';

!i;

5 10 KILOMETERS

Data LI88d for Interpretation:

(1) LlIIlologIclog

(2) Gamma log

(.)EJ..... 1og(4)_

EXPLANATIONVERTICAL SCALE GREATlY EXAGGERATED 0 5 10 MILES

~I__~~~__...J·

o

700

II Surficial aquifer system


o Cooflnlng unit

• -Clay• Pe........zone,

• Permeablezone 2

• Pe_""'8'II Upper Floriden equller• - - E8tImated

"! I'

'<: ~

~"'- iii'" .. "! ~

z q~

0 ~

~ 9 "zz~ o i' §g: .0 z '.8" ~ ~gw<J

~~:8w-li§!!J.

N 5:!g:g ~N ill.. ..

l; :!l "~:lili= ~ 115 :w 10

~~o a:: 0,0 ..FEET

( (100

SEALEVEL

100

200

300

....500

800

FIgure 15. Hydrogeologic section I-I' in southwest Florida. (Une of section Is shown In figure 6.)

32 Hydrogeology of the Burflclal.nd IntwmecIr.ttI Aquifer By..... In s.r.sota and AdIM:llnt Count_, Florida

I Cylene McPeeks ':-0.8 Geological Survey Rpt. 96-4063.tif J

Figura 33

Figure 18. Hydrogeologic sec:tlon J-J' In southwest Rorlda. (Una of section Is shown in figure 6.)

-

J'

o 5 10 MILES1-1--,...,-0.,_.~_...Jlo 5 10 KILOMETERS

"'"~~~!i "!w "- a!2

!!:; :j§! :;!

Data used for interpretation:(1) U1hoJoglc lag

(2) Gamma log

(3) E1llC1r1c lag

(4)_.

VERTICAL SCALE GREATLY EXAGGERATED600

700

200

600

500

400

300

Il!!llI S,"'." aq,no, system EXPLANATIONIntennedIate aquifer system

o ConfIning unit

• Venice Clay. ......-."""',• Permeable zone 2

• Pel'lTl8able zone 311IIII u",", Flo'clan .q,....• - - EstImated

J

'<'"~ ~~ g'"z z0

~0

~ !iw

!2 "- !2:l ;i; ;;;'" '" I!'FEET >- >-

'00

SEALEVEL

'00

LCy'!~.n_e.~~peekS - U.S Geological Survey Rpt 964063.lif

34 Hydrogeology of the SUrfl.llnCllntermedlate Aquifer Systems In Saruota Md Adjacenl Count.., FI0rkt8

I..II

I!

DEBOlDCOUNTY

CHARLOTTECOUNlY

HARDEE COUNlY

L J------,I

-------------------------------t--_·_--------------I

.~J--,p1'

MANAlEE COUNlY

0o~

EXPlANATION

-30"· GENEFW.JZED UNE OF EQUALlHlCKNESS OF lHE SURACIAI.AQUIFER SYSlEM··lmeN81Ia 10feet. Dashed '6tIen!I approximate.HachunNl Indicate thinner beds

~ 5 10 MIlESo S 10 KIWMElERS

'''30'

27'00'

Base from U.S. Geological Surwy digital data, 1:2,000,000, 1972Albers Equal-area Conic projectionStandard Parallels 29"30' and 45"30', central meridian -83000'

Figure 17. Generalized thickness of the surficial aquifer system In southwest Flarlda,

I Cylene McPeeks - u.s Geological Survey Rpt. 96-4063.lil

Base flOm U,S. Geological Surwy dIgital data, 1:2,000,000, 1972A1benl Equal..rea Conic projectionStandaJd Pal'8.llela29"3O'and~, centl1ll merfdlan-83-oo'

Figura 18. Generalized alUtude of the baa. of the Intermediate aquifer system In southwest Florida.

CHARlDTlECOUNlY

HARDEE COUNTY

LEECOUNlY

o

o

-------------------------------t-------------------

~o~

~<1""o

GENERAUZED UNE OF EQUAL ~AL.1TTUDE OF THE BASE OFnlEINlERMEDIAlE PQUIFEA SYSTEM- nIn feet beloW 188.18Wl1. IntaMliI '\)Is 100 feet

~

I,I

L ~------

,I

I

I

I-----------.j! DE SOlO COUNTYI

}i 10 MILES

10 KILOMElCAS

EXPLANATION

•9o

--500-

F1gurw 35

ICylene McPee~s::U.SGeOlogical Survey Rpt. 96-4063.tif

Base from U.S. Geofogical Surwy digital elata, 1:2,000,000, 1972A1be,. Equal-a,.. Conic projectionStandettl Pal1lllels 29"30' and 45"30'. central meridian ·83W

Figure 19. Generalized thickn888 and extent of permeable zone 1 of the Intennedlate aquifer system Insouthwest.Florida.

!

~I,

CHARLDTTECOUN1Y

DE SOlO COUN1Y

HARDEE COUN1YMANAlEE COUN1Y

-------------------------------t-------------------,I,I

I,I

EXPlANAilON

- 30 - GENERAUZED UNE OF EOU.....1HICKNESS OF PERMEABLEZONE 1 OF lHE INlERMEDlAlEAQUIFER SYSTEM-lnteNalla 10feet The zelO4oot line I&Pf8IEInIathe extent of the t.Wl1t HachUIUIndicate thinner beds

q 5 10 MILESo 5 10 KILOMElERS

'7"00'

cyiene McF',eeks - U.S Geological SUrv~x Rpt. 96-4063.lif

82"13'

I"

I'.';':".'

!

'00CHARLOTIE

COUNlY

DE SOTO COUNTY

HARDEE COUNTY

~ . J------

"II Ii Ii

MANAlEE COUNTY<@

20

- 60 - GENERAUZEO UNE OF EQUALTHICKNESS OF PERMEABLEZONE 2 OF lHE INTERMEDlAlE,fQUIFER SYSlEM-1n1ervaI8 .... 20,40. and 60 1eet. HachuT88 Indicatethinner bed.

,------------------------------t-------------------

q 5 10 MILES

o 5 10 KILOMETERS

EXPlANATION

26"30'

27"00'

Base from U.S. Geological Survey digital data, 1:2,000,000, 1972A1berB Equal-area Conk: projectionStandan:l Parallels 29"30'and~. central meridlan-83"OO'

Figure 20. Generalized thickness ot permeable zone 2 of the intermediate aquifer system In southwest Florida.

Flgu.... 37

ICylene McPeeks - U. S Geological Survey Rpt. 9~:4063. tit _

Figure 21. Generalized thickness of penneab/e zone 3 of thelnt8rmedlate aquHer system In southwest Florida.

~

I

i

I

200

CHARLOTIECOUNlY

DE SOTO COUNTY

I,I; HARDEE COUNlYI,I,I,I

L J------,I

I

'-~--.

MANAlEE COUNTY

9 ~ '.MILESo 5 10 K1L.OMETERS

-------------------------------t-------------------

EXPLANATION

-200 - GENERAUZED UNE OF EQUAL'THICKNESS OF PERMEABLEZONE 3 OF THE INTERMEDIATEAQUIFER SVSTEM-InIeJVaIs IlJ8 50and 100 feel Hachu... lnclcatethinner beds

Base from U.S. Geological SUMlY digital data, 1:2.000,000, 1972Albel'l Equal-area Conic projectionStandan:l ParaUela29'"3O' and 4'''30'', central merldian-83-oo'

27"00'

26"30'

ICylene"-McP"eeks -" u.s Geolo9ical Survey Rpt. 96-4063.lil

27·00'

-------------------------------t-------------------

MANATEE COUNlYHARDEE COUNlY

I,~_._.--_.----~------

DE SOTO COUNlY

CHARLOTTECOUNlY

I..

""0'

EXPLANAllON

-10 - GENER.M.IZED UNE OF EQUALlHlCKNESS OF n-IE VENICECLAY-In1eNalls to ieet. The zelOtoot lne represents the extent of !tievenice Clay. HachuntS Indicatethinner beds

? 15 10MlLES

o 5 10 KILOMETERS

LEECOUNlY

Ba88 from U.S. Geological Survey digital data, 1:2,000,000, 1972Albers Equal-area Conic plOjecUonStandald Parallels 29"30' and 45"30', central merldlan-83"OO'

Flgul1I22. GeneralIzed thickness and extent of the Venice Clay In southwest Flonda.

ICylene McPeeks - U. S Geological Survey Rpt. 96-4063.tit

Figure 23. Major pumping centers In southwest Sarasota County.

ENGlEWOODWAlER •DISlRlCT WEll FIELD 2 I

II ENGLEWOOD WATER!__ DISlRICT \\I'ELL FIELDf;

1 AND4 I

------c=rit~.J

~ENGLEWOOD WAlERDISlRlCTWELL FIELD 3

VENICE GARDENSunuTY

IIPl.ANTAnoNUTlUTY

IrVENICE

/WElLFIELD

I5 KILDMETEASo

oI

EXPlANATION

•MAJOR PUMPING CENTER··

. Well field or utility

Base from U.S. Geological Survey digital data, 1:2,000,000, 1972Albe1'8 Equal-lJ8a Conic pl'OJectionStandard Parallels 290)0" and 45"30", cenlral meridian .83"00'

2

ii

15::ylene McPeeks : u.s Geological ~,:urv~·~eLy.'-:R~p::.t....:9~6.::.4:,:O~6::::3:.:.ti::..f '-'-'P...:a:,;g"'e_4:..:...7j

,

1:,:·, ..:",i;

,i

I,-

CARL.TONRESERVE

c/86

0221

0,.

EXPLANATION

062 cf' 0'14~ ~ 1~ 187

'56 0183 *lEST WELL"'1195

' 198 70308 1ID207

~."!:-~)~.3 24 '~15 A 7.. '7VENICE Q171 rI4

12 WELL VENICE GARDENS304 F1ELC 1811UTlUlY

A 0 97.6. '81' 182,MAJOR PUMPING 189 200 303 1,0

• CENTER o. Well field 10 0204 PLANTATIONor uUlty SOUlli 087 UTlUTY

VENICE 48 05* TEST WELL TEST WEL.L .clOO 193

0128

WELL LDCAllONllNDEX NUMBER ~74 ENGLEWOOD WATER(as .hOM'lln table 3) () 159~1DI8mICT

~ 160 WELL FIELD 30201 WEll. TAPPING SURFICIAL 103.0-

AQUIFER SYSTEM 2020 107.

WELl TAPPING INTERMEDIATE 184 184~42. AQUIFER SYSTEM: 199 0 1 ENGLEWOOD WATER I

~05 'iiD'SlR'CT WELL FIElD 2 IA 164 PERMEABLE ZONE 1 08 1390 I

0108 PERMEABLE ZONe 2 \:,..,~.,. ~NGLEWOODWATER!• __ DISTRICT WELl. F1E~

(>126 PERMEABLEZONE3 1 AND 4 I

01 ·_·c~~~J147,162,180,

o 5 KILDMETEFIS 301,302

27'00'

27"1~'

Base from U.S. Geological Surwydlgital data. 1:2,000,000, 1972A1belB Equal.area Conic projectionStandard ParaUels29"3O' and 45"30', central merldlan ·83"00'

Figure 24. Surficial and intermediate aquifer system ground-water quality monitor wells in southwest SarasotaCounty,

Figura 41

1 Cylene M~~eeks- u.s Geological Survey Rpt. 96-4063.lif 1

Figure 25. Chloride concentration In water from wells'open to the surficial aquifer system In southwest SarasotaCounty.

WOVENICE

J1~WELLAELD

V VENICE GARDENSUTIUlY

11FVl<T:~NUl1LITY

2115..EXPLANA1l0N

•

I5 KILOMETERS

.w.033

MAJOR PUMPING CENlERWell field orutlilly

UNE OF EQUAL CHLORIDECONCENTRAT1ON- In m11lgrams

-250",:,,- per liter. Concentrallon InteMll &variable. Dashed w-... 8PJ)lDXImate. •Hachul98 indicate 818U Onlil8ll8r value

WELL-- Upper number Is Index numberIn table 3; lower number Is chlorideconcentrallon

Base from U.S. Geological Survey digital data, 1:2,000,000, 1972Albers Equal·area Conic projectionStandard Parallels 29°30' and 4.:1"30'. central meridian -83W

27"00'

[c::¥!~~~ McPeeks - U.S Geological Survey Rpt. 96-4063.lil

1ZJl '10 ENGLEWOODWAlER I

•DlsmlCT 'I

WEll. FIELD 2 I

-ENGlEWOOD WAlER DISTRICWWELLFIELDS 1 AND 4 r---

------c~~~.J

2fo__';;:"'~NIC"E

.l2. ..-/ well. RELD6~ VENICE GARDENS

U11UTY

~ II II020

o ~ ANorr.AllONU11UTY

2115'80

.1Jl,.

82"30'

1-------,-,-----'o 5 KlL.OMETERS

MAJOR PUMPINQ CENTERWell field or ullll1y

UNE OF EQUAL. SULFATECONCENTRATION·· In milligramsper liter, Concentration Intervalvarlabl•. Duhed where approximate

WELL·· Upper number I. Index numberIn table 3; IOMr number1111ulfateconcentration

EXPLANATION

•

""o •

-250"~

Base from U.S. Geological Survey digital data, 1:2,000,000, 1972Albers Equal-aAla Conic projectionStandard Parallels 290)()' and 45"30', central mltf1dlan -83"00'

27W

Figure 28. Sulfate concentration In waler from weBs open to the surficial aquifer system in southwest SarasotaCounty.

Agum 43

iCylene N1_,:Peeks - u.s Geological Survey Rpl. 96-4063.tif

FIgure 27. Dlssolved...oIk1s concentration in water from wella open to the surficial aquifer system In southwestSarasota County.

Base from U.S. Geological SUMJY digital data, 1:2,000,000, 1872A1be... Equal-area Conic projectionStandard Parallels 29"30' and 4S~. central meridian -83"00'

B2"U'

1--.----'o 5 KIlOMETERS

MAJOR PUMPING CENlERWell field or utility

UNE OF EQUAL DISSOLVEO-BOUDSCONCENlRAll0N-·ln mliligramt .2QLper Hler. Concentration IntelWl 8,260variable. Dashed wtIerv approximate.

WELL- Upper nLmber • Index nUmberIn table 3; lower IUnber Is dlS8O/Ved-aolldeconcentration

EXPlANA1l0N

~0 393

•-500~·

27'00'

27"15'

44 Hydrogeology or the Surtlclsllllld Intenudl... Aquifer Sy8tenw In s.-otII and Adjacent Countllls, FIorIdll

ICylene McPeeks- u.~_~~ological Survey Rpt. 96-4063.lil

Base from U.S. Geological Survey digital date, ':2,000,000, 1972Alba,. Equal-area Conic projectionStandard Parallels 29"30' and 45"30', central merldlan -83"00'

EXPLANATlON

VlJl!l, U2.~1,200

""-l1lI '.~ foo ENG~DWATERI

•DlsmlcT 1WELL RELD 2 I

-ENGlEYJOOD WATER DlfITAlCTWELL FIELDS 1 NIID 4 I

---c~~.J

.1li01,460

1--~-Jo 5 KILOMETERS

MAJOR PUMPING CENTERWei field or utility

10,000UNE OF EQUAl. SPECIFICCONDUCT}l\,ICE-ln m1croeiemenspercenllmeler. Intervalvariable. Deahed vmere approxlrTl8te.

~0806

•27"00'

-1,000--.

Figure 28. Specific conductance of water from wells open to the surficial aquifer system In southwest SarasotaCounty.

F1guree 4&

[Cylene McPeeks - uS"_Geological Survey Rpt. 96-"4663.tif

Base from U.S. Geological Surwy digital data, 1:2,000,000, 1972Albers Equal-area Conic projectionStandard ParaUels29"'3O' and 4SV3O', central meridian -83"00'

ENGLEWOOD WADISlRICTWELLFIElDp

__~1§i ~7JP1,520 45lJ

lllli., -::l:=t-..... 230 '577. ENGlEWOOD wAl-eR

DiSTRICT 'IwelJ. FIELD 2

...".,;;;..<!!.!GLEWOODWA~RDISTRICT WELL F1E1JJ81M1D4 ,

---c~AfflJff---......,.---lo 5 KILOMElERS

MAJOR PUMPING CENTEFIWell field or utility

UNE OF EQUAL CHLORIDECONCENTRATION-In milligrams 1,5(0)\(~[ll.!~pur liter. Concentration Interval d'Cvariable. Dashed where approximate \P"

WELL·· Upper number I, Index numberIn table 3; lower number I. chlorideconcentration

EXPlANATION..-260~-

27"00'

Figure 29. Chloride concentration In water from wells open to thelntermedia1e aquifer system, permeable zone 1, Insouthwest Sarasota County.

48 Hydrogeology Of U. SUrficlalMd Intermediate Aqu!t.r Sptem8 In 8wuotII and Adjacent Countlu, Florida

'Cyle~!: McPeek. -U.S Geolo.!lical. SurveyRpl. 96-4063.til il

8aS8 from U.S. Geological SUMydigltal data, 1:2,000,000, 1972Albert Equal-area ConIc projectionStandard Parallels 29,,](), and 45"30', central meridian -83"00'

EXPlANATION

VENICE GARDENS

i~·~moN1J.~T1UTY

I ~MIl.ES

o 5 K1LOMElEAS

MAJOR PUMPING CEN1ER~·

Well field or utility

LINE OF EQUAL SULFATEOONCENTRATlON··ln milligramsper liter. Concentration Int81\1&1variable. Dashed wheN approximate

WEll·· Upper number Is Index numberIn table 3j lower number is lulfateconcentration

•-250··,

27"00'

Figure 30. Sulfate concentration In water from wells open to the Intennedlate aquiler system, penneable zone 1, Insouthwest sarasota County.

Flgum 47

@X!!:~~"~c:,:~.~"~s :.~..:.~Geological Survey Rpt. 96-4063.lif

o 5 KILOMETERSBase from U.S. Geological Survey digital data, 1:2,000,000. 1972A1bel'B Equal-area Conic projectionStandard Parallel. 290W and 450J0', central meridian -83W

27"00' UNE OF EQUAL DISSOLVED·SQuas-soo •• CONCENTRATlON··jo milligrams

. per liter. Concentration InteMilIvariable. Cashed where approximate

162 WELL·· Upper number Is Index numbert::,.m In table 3; lower number Is dissolwd

solide concentration

82"~

MAJOR PUMPING CENTER-·Wen field or utility

EXPlANAilON

•

27°15'

Figun 31. Dissolved-solids concentration In water from wells open to the intermediate aqUifer system, permeablezone 1, In southwest Saruata County.

48 Hydrogeology of~ Surflcltilend Int..-rned18te Aquifer By_me In Saruota and Adjaoent Countln, Ftorida

Pages5!1IcYien~_~~,:~ekS - u.s Geological SUi"I!.ey Rpt. 96-4063.lil~"-'-- . ~.............J

EXPlANATION

Baa8 from U.S. Geological Surveydlgitar data, 1:2,000,000, 1972Albers Equal-area Conic p$ctIonStandard Parallels 29"30' and 45°30', central merldlan -83"00'

iDWATERICT i

=,-::,","aD~" 2 ,o WATEA DI~lRlELDS 1AND 4 I

____~~T1\£QJCHARLOTTE CO.

82'"30'

• MAJOR PUMPING CENTERWell field or utility

UNE OF EQUAL SPECIFICCONDUCTANCE·· In mlCfOslemensper centimeter. Dashed ¥lttereapproximate. Hachurealndlcatearesa ot le...r value

1§2. WELL- Upper number la Index number6.820 In table 3; lower number Is specific

conductance

f---,--------'o 5 K1LDMETERS

27W

Figure 32. Specific conductance of water from wells open to the intermediate aquifer system, permeable zone 1, Insouthwest Sarasota County.

F1guRlS 41

1:"gy~e~ne" McPeeks - U"S Geological Survey Rpl. 96-4063.I~if ~ ~~_~~~--"-=;:,,c:-=~.

•

ENGlEWOODWAlER!DIS1FlICT IWELL FIElD 2 I

- ENGLEWOOD WATER CIPTRICTWELL FIElDS 1 AND 4 ,

------c~~_g§.J

oW....

~ENGLEWOOOWATERDISTRICTWELl FIELD 3

~

"'""IPlANTATION57 U11UTY

1meo

o

~\

oS~.5Z....~

o <a-8. 22ll

''''''''-'''43

MAJOR PUMPING CENTERWell field or utility

EXPLANATION

•UNE OF EQUAL CHLORIDE

-250-· CONCENTRAll0N-lnmilJlgrama 250per liter. Concentration Interval 1000vall.ble. Dashed where approximate. 'Hachuf88 indicate areas of I.narvalue 2~

O •..llIL,.20 WELL-Upper number Is Index number 4,920i~~~~~

In table 3; IOwef number 18 chlorideconcentration

ff----,------Jo 5 KILOMElERS

Base from U.S. Geological Survey digital data, 1:2,000,000, 1972A1bal1l Equal-area Conic proJecUonStandard Parallel. 29-30' and 4''"30', central meridian -83"00'

FIgure 33. Chloride concentration In water from wells open to the intermediate aquifer syatem, penneBble zone 2, insouthwest Sarasota County.

27"00'

50 Hydrogeology of the SUrficial and InterrMdlD Aquifer SystllrrIIIln 8IIruotll end Adjacent Count... Florid.

1 Cylene McPeeks - u.s Geological Surve-y--=R=-p-I-.9'--6=-4-'--06=3--:_,I=il-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-~-_-~-~-_-_-_-::~~~~~-::!P--:ag-e--:TJ:5:::""l71

srls',

gl<1'8>-w

~t

•

ENGLEWOOD WATER iDISlRICT I

-ENV:~~ ~A1ER DI¥TRIWEL.L RELDS 1 AND 4 I

------c~~~.J

lIliIiICE GARDEN

18 Ita2. PLANTATION30 ll11UTY

oW

)IENGLEWOOD WATER

~~LD3 .

o 5 KILDMETEAS

MAJOR PUMPING CENTERWellileid or utility

UNE OF eaUAL SULFATECONCENTRAllON·-ln mHllgramsper liter. Concentration Intervalvariable. Dashed where approximate.Hachurea indicate arass of lesaer value

WELL-· Upper number 18 Index numberIn table 3; lower number 18 sulfateconcentration

EXPLANATION

o~

•-250"·

Bas.trom U.S. Geological Survey digital data, 1:2,000,000, 1972A1bel8 Equal-area ConIc projectionStandal'd Parallels 2~' and 4j~, central meridian -83W

27"00'

Figure 34. Sulfate concentration In watsr from wells open to the intermediate aquIfer system, permeable zone 2, insouthwest Sarasota County.

Fllltni 61

i C~lene McPeek. - U:~"~eological Survey Rpt. 96-4063.111 ···.P.·.ae58..,1g ....

Base from U.S. Geological Survey digital data, 1:2,000,000, 1972A1bel1l Equal-area Conic projectionStandard Parallels 29°30' and 45"30', central meridian -83"00'

EXPLANATION

•

ENGLEWOOD WAlER iDI8'TRICT IWELL FIELD 2 I

-ENGlEWOOD WAlER o,mlWELL FIELDS 1 AND 4 I

------c~88J

olH

~ENGlEWOOD WA.TERD151RICT

, WEll AELD3

'-%

1 y"'1£8o 5 K1LCMElERS

~~iuB"LD.1:4 ..2,180

WC'i.~DEN

tailPLANTATION316 UllUlY

MAJOR PUMPING CENTER-Well field or utility

UNE OF EQUAL DISSOL.YEo-SOUDSCONCENTRATION-In milligramsper liter. Concentration Intervalvariable. Dashed where approximate.Hachul8slncllcate are.. of lesser value

WELL- Upper number I, Index numberIn table 3; lower nUmber Is dissolved.solids concentration

•

0'£

27"15'

27"00' _ eoo ....

Figure 35. Dlssolved-solJds concentration In water from wells open to the IntennedlBte aquIfer system, penneablezone 2, In southwest Sarasota Cowrty.

52 Hydrogeology of the SurflcJ. end Intenneelete Aquifer Syeteme In S8ruote end Adjecent CountJu, Rorlde

iCyleneMcPeeks =-U.S~GElOlogical Survey Rpl. 96-4063.lif~~"-'--'---------------::---"C""I

.

Base from U.5. Geological Survey digital data, 1:2,000,000, 1972Albers Equal-area Conic projectionStandard Parallels 29°30' and 4S-:W. central mendian -83000'

f TMILES

o 5 KILOMETERS

LINE OF eaUAL SPECIFIC-1000". CONDUCTANCE-In micro8lemen.

• Pef centimeter. Interval variable.Oaehed where apPrDxlmate

...1Q8... WELL- Upper number Is Index numbero 15,100 In table 3; lower number Is specific

conductance

MAJOR PUMPING CENTER··Well field or utility

EXPLANATION

II27'00'

Figure 36. Specific conductance of water from wells open to the Intennediate aquifer system, permeable zone 2, Insouthwest Sarasota County.

Figures 53

I Cylene MCPeeks - u.s Geological Survey Rpt. 96-4063.lil

Base from U.S. GeologIcal SUIV8Y digital data, 1:2,000,000, 1972A1berB Equal-area Conic projectionStandald Parallels 29030' and 4S"3O', central meridian -83000'

EXPLANATION

ENGLEWOOD WATERDISlRlCTWELl FIELD 2

ENGLElNOOD WA*'RDISTRICT WElL FIE S1 AND 4 I

--~8!Q...-c~~~,J

82°]0'

o 5 K1LOMElERS

oI

MAJOR PUMPING CENTER-·Well field or utility

UNE OF eQUAL CHLORIDECONCENTRATION-In milligramsper liter. Concentration Intervalvariable. Dashed where approximate

WeLl-- Upper number 18 Index numberIn table 3; lower number Is chlorideconcentralon

-500··

•.ill..<> 3.250

27W

Figure 37. Chloride concentration in watertrom wells open to the tntennediate aquifer system, permeable zone 3, Insouthwest Sarasota County.

ICylene MCF'e..eks -ITs Geological Survey Rpt. 96-4063.li(----._-----~~-

Baaefrom u.s. Geological SUMY digital data, 1:2,000,000. 1972Albers EquaJ-a188 Conic projectionStandard Parallel. 29°30' and 450J0', central meridian -83000'

ENGlEWOQDWAlER I

.ao2. DISTRICT WELL FIELD 2 !.... ~ENGLEWOOD WA R• __DISTRICT well. FIE

.3D1.. 1 AND 4 I

---!BJI--c=ritga,J

0 126700

~ENGlEWOOD WATERDISlRlCT .WEL.L AELO 3

I5 KILOMETERSo

oI

MAJOR PUMPING CENTERWell field or utility

UNE OF eQUAL SULFAlECONCENTRAll0N-ln m1111g1afT'1aper Utero Concentration Interval Is 500milligrams per liter. Dashed wh81'8approximate

WELl.- Upper number Is Index numberIn table 3; lower number I. aulfateooncentratlon

EXPlANATION

•-1,000-

27000'

Figure 38. Sulfate concentration In water from wens open to the intermediate aqu"er system. permeable zone 3. insouthwest Sarasota County.

FJguru 55

21

"....

EXPLANATION

• MAJOR PUMPING CENTERWell field or utility

UNE OF EQUAL DISSOLVED·SCUDS-1 000.. CONCENTRATlON- In milligrams per

I • liter. Concentration Interval variable.Dashed whel9 approximate

~ well.·· Upper number lalndex numbero 7.320 In table 3; lower number Is dlssolved-solldaconcentration

I Io 5 KILOMETERS

Bas. from U.S. Geological Survey digital data, 1:2,000,000, 1972Albers Equal-area Conic projectionStandard Parallels 29°30' and 45"30", central meridIan -83000'

Figure 39. Disolved-scMlds concentration in watsr from wells open to the Intermediate aquifer system, permeablezone 3, in southwest Sarasota County.

56 Hydrogeology of the SUrficial and Intltrmedlate Aquifer By..."" In Bar-.otllanc:l Adleoent Countl... Aorldll

[Cylene McPeeks - U.S Geolo9ical Survey Rfll. 96-4063.lil

_IIlI,'",'l.If"~~

81 .

'8~Iw~'I!!

~lL

ENGLEYiDOD WATERDISTRICT WEll. FIELD 2

• ENGlEWOOD WAJRDISlRICT WELL FIElDS1 AND 4 f

____~~J~CHAALDTI'E CO.10,370

VENICE GARDENSUTl=

1-....-- -'000

'~TAll0NUTlUTY

.m.3,320

.)IENGLEWOOD.WATERDISTRICTWEll. FIELD 3

I--,-----.Jo 5 KILOMETERS

82"30'

MAJOR PUMPING CENTERWell field or urillty

EXPLANATION

•UNE OF EQUAL SPECIFIC

.. CONDUCTANCE·· In microsiemens--3,000 • . per centimeter. InteNaI variable.

Dashed wheN approximate

...MZ.- WELL·· Upper number Is Indsx number010,370 in table 3; lower number 18 specific

conductanco

Base from U.S. Geological Survey digital data, 1:2,000,000, 1972Albers Equal-area Conic projectionStanden::! P8railela29"3O' and 43"]0', central meridian -83'"00'

27"00'

27"15'

Figure 40. SpecIfic conductance of water from wells open to the lntermedlate aquifer system, permeable zone 3, Insouthwest Sarasota County.

Filum 57

r-Cylene McPeeks - U.S Geological Survey Rpt. 96-4063.tif j

Zo: 600Q w~t: Bailer uMd to sample Sampling procedures=ed to clearing casing volume0:-' (P~~~1~'19) (p In 1989)

!zffi 400 Product" rates decteasedWo. nwell "sid 3 Production rates IncreasedOm / In well fiflId 3Z::i!0 ..00: 200W<.!JQ30:_O::i!-'z 0:I:_

° '987 ,... '989 '090 '99' ,... 1993

zo: 250OWt=t:~-' 200

!zffiwo. 100om!5~ '000<.!Jw-t(~ 50u.::;;-'zijl- 0

'987 '088 '989 '090 '99' '992 '99'0: '.200 i!\lllllilllll!ID~

~z~ 1,000ENGLEWOOD WATER DISTRICT EPZ 9~3801:::::iQ w I IN~~\;}r"Q'ABLE ')

~I-o.6~(/) 800 DEPTH 70 FEET

!!;!I-::i!800

J~-'~~

O°<.!J '--J VV(l)Z::J'V~'-m8= 400 ~

15 ::i!~ 200

1967 ,... '98. '090 '99' ,... '.93YEAR

Figure 41. Chloride, sulfate, and dissolved-solids concentrations in water from intermediate aquifer system,permeable zone 1, at the Englewood Water District well EPZ 9, 1987·93. (Data coDected by Englewood Water Districtpersonnel.)

58 Hydrogeology 01 the Surflcbll and IntermediN Aqutrer Sy."'" In Su-.obl and Adl_nt Countlu. Floridil

leylen;; M~'peeks - u.s Geological Survey Rpt. 96-4063.lil

5OL-_'----'C_--'_--'_--'_ ___'_ _'__ _'__ _'__ _'__ _'__-"

'50 r--""__-~---,--~~--r----'---r---,---r--~-__r--,Zo:Ow

~~... 0:Zwwe..0",z::;8~w£1Q::I0:0::;-'z:1:-o

200

'50

'OIl

1983 '994 19..

Col'fie" produo1loo

rates were Increased

,--/I

1986 1987 1988 1989 1990 '99' 1992 '993 '994

120 r--~-__r-_r--.--~-..,.__-__r-_r-__,---r----.--_,

'9"'9"'99'1988 1989 1990 1991'987'9"1984 19851983

40

90

90

'OIl

YEAR

650 .---r--__r--.---.--r---r--__r--.---.--~--,--_,

900

500

550

4OOL-_'--~c_--'c_--' _ _=_"--,----'--'---'--,,-'---,--'-__,_-'-__,_-,J1983 1984 1985 1986 1987 1988 1989 1980 1991 1992 1993 1994

450

Figure 42. Chloride, sulfate, and dissolved-aollds concentrations In water from Intermediate aquifer system.permeable zone 2, at the Venice Gardens well field monitor well 9. 1985-90. (Data collected by Venice Gardenspersonnel.)

Figures 59

Cylene McPeeks • u.s Geological Survey Rpt. 96:4063.lif

O'-_ _'__-'-_.....L._ _'__~__L-_-'-_.....L._ _'___'__ _'__ _'

'00 r---r--r--r---r--r--.---r--r--r--~-~-....,

'9941983 1984 1985 1988 1987 1988 1989 1990 1991 1992 1993

80

40

80

20

20 L-_-'-_~__'-_-'-_~__'-_-'-_~__L-_ _'__~_ __'

'00 .---r--r--r---r--r--.---r--r--r--~-~-"'"

\

'9941986 1987 1988 1989 1990 1991 1992 19931983 1984 1985

40

80

80

/

w....~_uctionrates were Incru88d

IPlANTATION MW4

iN~~c.,WABLE3)CA3ING ...EOEPTH 180 FE

200 '-_........_-'--_......._ ......._-'-_-'-_~_.....L._~_ ___'__~_ __'

800r---,---r--r---,---r--.---,--~--~-~-~-_.

500

400

300

1983 1984 1985 1988 1987 1988 1989 1990 1991 1992 1993 1994YEAR

Figure 43. Chloride, sulfate, and dlssotved-80Dcfs concentrations In water from Intermediate aquifer system.permeable zone 2, at the Plantation monitor well MW4, 1987-94. (Data collected by Plantation personnel.)

60 Hydrogeology of the Surficial and Intermedilte AquH...Sys~ In SUuotli and AcIJ-nt Count.... Floridli

@'ylene M,~Peeks - U.S GeoloQlcal Survey Rpt. 96-4063,111 Page :67 1

a:wI- 500

-:Jis a:

400 Jw-wc!<Q..[fa:(I)

300O\;::O....lUJ~:rOe! 200°z-oj

O'jE 1001983 '984 '985 1986 1987 '988 1989 '990 '99' 1992 1993 1994

;,;2,000

\-ZenQ::Oa:

~~~~',5OO<.-£LJ~z-'::)~ ~ffi 1,000en z D.-

O;';0a: 500

~'983 '984 1985 '986 1987 '988 1989 '990 '99' 1992 ,- 1994

Cf) R::J 5,500

g~c: SOUTHBAY UTILITY PZ2

-'-w 3,000271037082285901

O~D.-

~INDEX NO. 220 (TABLE 3)

en en CASING 60 FEET

~\;:i 2,500DEPTH 100 FEET

~wa:~Oe! 2,000 -z-eng;;!i5 ::0 1,500

1983 1984 1985 '986 1987 '988 ,- '990 199' '992,_

'994;,;YEAR

Figure 44. Chloride, sulfate, and dissolveckolids concentrations in water from Intermediate aquifer system,permeable zone 2, ,at the Southbay UtIlity well PZ2, 1983-94. (Data collected by Soulhbay Utillly personnel.)

Figu.... ,1

Lcylene~McPeeks ~ U.S Geological Survey Rpt. 96-4063.tif

Z~a:4,000

~~12::;!zffi 3,500

wa.0'"z::; 3,000

812~3 2,500a:-0::;-'z 2,000I-

° '1183 19.. 1985 19.. '987 '9" '989 1990 1991 1992 1993 19..

:ia: 600o~

~::; ~:'=re~~!zffi 500

wa. ,>0'"z::; 400

0120"~:J 300<=~::;:>z 200"'- ,... '984 '985 '986 1987 '986 '989 1990 1991 '992 1993 19..

~ 9,000 !!lii1ffi\lI!llli

~z-~ 8,000ENGELW~ODWATERD~TR~

Well fleld p:roducUon -AO PROO I WEll. 1:JQ w 1~47 ABLES),.188 were lricrused

0"" a.'" 12 '" 7,000 E TH425 FEc.... ~Wz~w 6,0000~12 .gJ o::f ',000Ci°:!

~ 4,0001983 1984 '98' '9" '987 '986 198. 1990 199' '992 1993 19..

YEAR

Figure 4S. Chloride, sulfate, and dissolved-solids concentrations In water from Intermecllale aquifer system,permeable zone 3, at the EWe RO Production weill. 1983-93. (Data collected by Englewood Water Districtpersonnel.)

62 Hydrogeology of the Surflct.l and Intermedr.te Aquifer Sy...,.,. In Saruota lind Adjacent Count.... Floridll

:to: 800Qw!<t:0:-'

!zffi 800 ~-wo.OwZ::>0",00:

400w'-"C::J--,0:-0::>-'z

'00:I:_0 '983 19.. ,... '988 1987 1988 '98' '990 '99' 199. 1993 '994

:to: 1,800Q~

~::J ',800... a:ZWwo. ',400OWZ::>O~ 1,200

~0,-"w-~~ 1,000

~::>:::>Z 800W- ,... ,... 1985 ,.88 '987 '988 1989 1990 1991 111192 ,... '994

et 4,000 -~en -::::;Qt5a:6J=; ~ 3,000 PLANTATION MW3

'Vvvl)"I~w270408082215501

~INDEX NO. 303 (TABLE 3)c ... ::> CASING 245 FEET!!:!Z~ DEPTH 380 FEET-,W00 <.? 2,000(/lZ3~8:!

~ 1,0001983 ,... ,... 1988 '987 "88 1989 "90 1991 1992 '''' 1994

YEAR

Figure 48. Chloride, sulfate, and d1ssoJved-solids concentrations In water from intermediate aquifer system,permeable zone 3, at the Plantation monitor well MW3, 1987-94. (Data collected by Plantation personnel.)

Filii.... 83

[CY1~ne !"1cPeeks - U.S GElOlogical Survey Rpt. 96-4063.lif

1992 1993 1994

1992 1993 1994

1991

'99''990

'990

'999

'99.

'999

'99.'997

'9971986

,...'995

,...

500

, ,000

300

'00'--~--~---'---~--~--'----'---~---'-----'

200

',500

400

6OOr--.,--~--.---...,----r--,.---.---..,.---r---.,

500

2,000

2,500 r---.-----.---~--~--,_-~--___,.--__._--_r_-___,

',000 L-_-'-__-'-_~____'____'___~____'____'__~__...J

'985 1985 1987 1988 1989 1990 1991 1992 1993 1994-YEAR

2,000

1,500

SARASOTA~NTY unUTY PZ3

~'~300.,~"iSrnH-:l3b FEW

Figure 47. Chloride, sulfate, and disaolved-solids concentrations In water from intermediate aquifer system,permeable zone 3, at the Sarasota County Utility weU PZ3, 1985-94. (Data collected by Sarasota County personnel.)

84 Hydrogeology 01 the Surficial end Intermediate AquH.r Syattlm.ln SIIraaota end AdjKent Countl.., Florid_

I cyle!]e-MCPeekS - U.S_~eolo9ical Survey Rpt 96-4063_tif

400r--~-~--~--.----'--~--'--~--~-~--~-~

1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994

1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994

200

300

100 L_-'-_-'-_--L_-'__'-_-'-_-'-_-"-__'-_-'-_-'-_...J

2,000

1,0008OO'-_-'-_-'-_--'-_--'__'-_-'-_-'-_--L_-''-_-'-_-'-_-'

1,500

2,800r--,_--,--~-~~-~-~--,-----r--,__-,_--,----,

2,500

II: 3,500r--,_---r--~-~--,__-,_-__r_-~-~--,_-~-_,

t':!Cf) -:JQ~a: 3,000...J-wO!;(a."'"en0 .... ::0 2,500wz<~wa:0(,)<:)"'Z3 2,000

~8~~ 1,500 L-_'-_-'-_-'-_-"-_-',-_-,-_-'--_-'-_-'-__'-_-'-_...J

1983 1984 1985 1986 1987 1988 1989 1990 1991 1902 1993 1994YEAR

Figure 48. Chloride, sulfate, and dissolved-sollda concentrations in water from Intermediate aquifer system,permeable zone 3. at the Southbay Utility well Pl3, 1989-93. (Data collected by Southbay Utility personnel.)

Rgu,.. 66

L~~:!:!e McPeeks - U.S Geological Survey Rpt. 96-4063.tif

6- CHLORIOE CONCENTRATION, IN MILUGRAMS PER UTER00 ~ ~ ~ ~ 100 1~ 1~ 1M 1~ M

HYDROGEOLOGICUNIT

4500!-~~-500;*:;--~",1.:;tOOO~~-""".500=-~"""2".OOO""'~~",";;2,500~

o - SULFATE CONCENTRATION, IN MILLIGRAMS PEA LITER. 0 - SPECIFIC CONDUCTANCE, IN MICROSIEMENS PEA CENTIMETER

AT 25 DEGREES CEI.SIUS

"""'MEDIATEAQUIFERSYSTEM.PERMEABlE'ON"

,,""""'-AQUIFER SYS'TEM ,

CONFINING UNIT

"""""'''''''''AQUIFER 8Y8TEM,

PEIWE.\BLE ZONE 2

CONFINING UNIT

INTERMEDIATEAQUIFEFl SYSTEM,PERMEABLE zotE 3

50

Iii 100 WATER SAMPLES WERE COLLECTEDUSING PORE-SQUEEZING APPARATUS

WLL

~

W 150()

L1'II:

200:J

'"0~ 2503:0.....wen 300:I:

Ii:w0 350

400

Figure 49. ChlorIde, sulfate, and speclfic.conduetance values at selected depth Intervals below land sulface at theCarlton Reserve test well.

66 Hydrogeotogy of the Surfhul and Im.nnedllde Aquifer Sv-a-ma In s.a.ota .nd Adjacent Countiu, Floridll

[, Cylene McPeeks - U.S Geolollical Survey Rpt. 96-4063.lil

SURFICIALAQUIFER SYSTEM

CONFINING lRoll

INTERMEDIATEAQUIFER

P~~EZONE 1

CONFINING UNI

INTERMEDIATEAQUIFER

pBXW~ZONE2

CONFINING UNI

INTERMEDIATEAQUIFER

p~tEZONES

Iii 50WU.

~WATER SAMPLES WERE COLLECTED

USING PORE-8aUEEZING APPARATUSW 100

~ 150a:::JrnC 200

~

~250

WIII 300::t:l-n.

350wC

400 0 SOO 1,000 1,500 2,000 2,500

o - SULFATE CONCENTRATION, IN MllUGRAMS PER UTER

0·· SPECIFIC CONDUCTANCE, IN MICROSIEMENS PER CENTIMETER

AT 25 DEGREES CELSIUS

Figure SO. Chloride, sulfate, and speclfio-conductance values at selected depth Intervals below land surface at ~.....the South Venice teat well. ' '. '.,

6 - CHLORIDE CONCENTRATION, IN MILLIGRAMS PER LITER HYDROGEOLOGICo0 20 40 60 80 100 120 140 160 180 200 UNIT

FililUfH ~

Figure 51. Maior-ion concentrations of water from the intermediate aquifer system at selected intervals below land surface at theCarlton Reserve and South Venice test wells.

Sodium + PotassIum~Calcium~ BIcarbonate + Carbonate

Magnesium Sulfate

SuOldeJ .."II,,, ."tern'nll"modlale ..uIIe,_Permeable mne 1 of the lASf'eImeabIe zone 2 of the lASPermeable zone 3 of the lASConflnlng ant between the BAS and PZ1ConfIning wit between PZ2 and PZ3Confining l.I'Iit between PZ3 and the Upper Floridan aquifer

20,

15,

'0,5o

,5

MlweQUIVALENTS PER UlEA

CATIONS ANIONS

SOUTH VENICE TEST WELL

,'0

<: >-'Z7 FEET CU SASlPZ1

< >-n FEET lAS PZ1

<P125 FEET VENICE CLAY

{ ..>291 FEET CU PZ2JPZ3

I /304 FEET CU PZ2IPZ3

""" 373 FEET lAS PZ3

'520

EXPLANATlON

,, 15

,10

,5o

,5

MlweQUIVALENTS PER UTER

CATIONS ANIONS

-<:20 FEET CU SAS/PZ1

< :>40 FEET VENICE CLAY

< >-94 FEET lAS PZ2

<:148 FEET lAS PZ2

I162 FEET lAS PZ2

350 FEET lAS PZ3

'--432 FEET CU PZ3IUFA

CARLroN RESERVE TEST WELL

,'0

BASlASPl1PZ2PZ3

CU SAS.iPZ1CU PZ2IPZ3CUPZ3IUFA

15

i

fJj

J!!.

fIn

ii

I~

t

f..f

"'1'---'"

!Cyiene McPeeks -u.S Geological Survey Rpt. 96-4063.iif

Pm~lH,._y_.....~"_>,MocIlIed by Barr, 1996

SEPTEMBER 1993

9 5 10 MILESo 5 10 K1LDMETERS

EXPlANATIONMAY 1993

o 5 10 MILESo 5 10 KILDME1CAS

Bue,1rom U.S. Geological Survey dililillli data, 1:2,000,000, 1872A1belll Equal..rel Conic profectlonSt.ndard Parallal, 2Y.5O'and~, centnllM~dlan -13"00'

""'-._M_"_>'MocIlIed by BIIrr, lfi8

., ,!1i

t t I>--,

N N

0c- ce'8.... ....

9,., 9,., :g

\. \. !~'w'Q'6 '6

_~_J __

---20- POTENTlOMETRIC SURFACECONlOUA - ShowII altitude ofPDtentlometric surface. ContourIntel'll8lls 10 teet. HachUIHindicate dlPfUS/ona. Datum 18sealevel

+--- Direction of groond-water flow

Figure 52. Composite potentlometrlc surface of the Intermediate aquifer system. May and September 1993.

FlguI'8II 89

Cylene McPeeks - u.s Geological Survey Rpt. 96-4063.lil F'ae.·.·.·.7.. 6il......g

2•

10

..J

~ 2.U'irn 24

I1;;22~i!:

~20

ffi 18!;(;=~ 16wCl

~ 14

•• SURFICIAL AQUIFER SYSTEM MONrroR WEl.L, CASING 8 FEET, DEPTH 13 FEET

o ·1"lTERMEDlATE AQUIFER SYSTEM, PERMEABLE ZONE 2 MONITOR WB.l, CASING 100 FEET, DEPTH 120 FEET

o -INTERMEDIAte AQUIFER SYSTEM, PERMEABLE ZONE 3 MONITOR WElL, CASING 245 FEET, DEPTH 28!5 FEET

6. ·INTfRMEDIATEAQUlFER SYSTEM, PERMEABLE ZONE 3 MONITOR WELL, CASING 380 FEET, DEPTH 400 FEET

+ .UPPER FLORIDAN AQUIFER MONITOR WB.l., CASING 510 FEET, DEPTH 700 FEET

30

.'--J.--...l--J...-J._L.......l-...l--J...-J.-'l-..l-+-J...-J...-'_J--J.---J...-J._l-..l-...l--J...-JJFMAMJJASONDJFMAUJJASONO

. 1993 1994

Figurtl 54. Water levels In the 8urficlal, Intermediate, and Upper Floridan aquifer monitor wells at ROMP TA 5-2,January 1993to December 1994.

70 HydrogllOlogV 01 the Burflclaland IntermediN Aquifer SystwnI; In hruotII and AdJ-cent CountlH, FIorkhI

Table 1. Summary of well records and hydraulic properties of the surfICial and intermediate aquifer systems at selected sites and areas in southwest Florida

lEWD, BliPwood Wtr«District; FOS. Flodda OcoIogiCIII Surwy; SWFWMD. Soutbwcst Florida WIdD MaDagemtntDislrict; ROMP, RecioDal Observation Monittr Program; USGS, U.S. Geological SurYey; ft, l'cet; tt?td, feet squami per day; (ftJdYft, feet pel day per foot; ftId, feet per day; <.less than; >. greatecthm; -. DO data]

Site namelwell_ ogle (:asIngfdepth or T_ ......... S_ Hyd.....1e

nurn....S~ IdentifiClltion

unU' (nIemIl below '.nd _{ft'td} ......- coefficientccnductlvlty Reference

surJat;e (It) [(ftldl/ltl (ftId)

Carlloc R=vc 270803082210301 SAS . '. 70.0511 Campbell and others.Ic5twell (1993)

SAS 'IS 7.cI0233 Do.SAS 'I. 7.673 Do.

CUPZ1IPZ2 '3. 7.001 Do.(Venice Clay)

lAS PZ2 (confining ] 101 7.00394 Do.material)

IASPZ2C_ '122 0( ,0024 Do."""""al)

CUPZ21PZ3 ' 165 7.000196 Do.CUPZ21PZ3 3119 7.000155 Do.CUPZ21PZ3 '206 8 <.0IXI00000036 Do.

lAS PZ3 (confining '402 adlOOOOOOOO36 Do."""""al)

lAS PZ3C_ 3 413 1<.OOOOOOOOO36 Do."""""al)

CUPZ3llJFA '426 7.0000155 Do.CUPZ3llJFA '441 8<.OOOOOOOOO36 Do.CUPZ3llJFA '460 8<.£10000000036 Do.

South Venice teIt 2703400822554 CUSASJPZl '31 7.00282 Do.well

Cll SASlPZI '38 7,(XI38S Do.eu SASJPZI '59 7.00502 Do.CUSASJPZl '7. 7.00592 Do.

lASPZIC_ 2111 7.00828 Do."""""al)

CUPZJIPZ2 2126 7.'~.00026S Do.(Vcmcc C1&y)

lASPZ2<_ '246 7.0000002 Do."""""al)

f lAS PZ3<_ 3416 .00523 Do."""""al)

lAS PZ3 (ccnfinin, '543 7.000332 Do.

=:! """""al)

I

Table 1. Summary of well records and hydraulic properties of the surficial and intennedlate aquifer systems at selected sites and areas in southwest Florida -Continued

lEWD, Englewood Watec District; FOS. F1oridaGcological Survey; SWFWMD, Southwest Florilk Water Management District: ROMp, Regiooal ObscrvatiOll Monitor Program; USGS, U.S. Geological Survey; ft, f'ect; ~/d, fcc:l: squared per day; (ftfd)lft, feel per day pel" foot; ftfd, feet per day; <, 1ess lban; >, greater than; -. no data]

Geraghty and Miller. Inc.(1975)

Do.Geraghty and Miller, Inc.

(1981)

$,11 13.44)10.1250

470

430

21/85

1000

41/67

caalngldepth orTnlnaml...

.......... s_Hydr1lulic

interval below 18nd _In'td)_Iont _Iont conductivity Reference

........ (tt) l(ftId""J lftld)

'25 0.cXlO229 FOS, written comm.(1991)

'SO 8.00000752 Do.

l114 .0000454 Do.

l182 8.()()()(lO()752 Do.'200 .0000324 Do.'24. 7.00342 Do.

'285 7.00139 Do.

121.340-1,870 47-60 Sutcliffe (1975)

1~140->3.340 53 Do.

1,800 40.19 '56 Geraghty and Miller, Inc.(1981)

1,100 40.15 $$17 Do.

5·10110-16 $ 2.5-159 Ardaman and Assoc.,Inc. (1992)

SASSAS

SAS

SAS

SAS

SAS

Hydrag!alogkunit'

SAS

SAS

CU SASIPZI

IASPZ2(confiningmaterial)

lAS PZ2 (confiningmaleriol)

CUI'Z2IPZ3

CUI'Z2IPZ3

lAS PZ3 (confiningmalerial)

CUPZ3IUFA

2711430822403

She IdentlflcatJon

Walton test well

a_Is....well field (westawiotte Co.)

a_1sIaDdwell field (north

west Charlotte Co.)

Carlton Reserve(central Saruota

Co.)

Codlon Reoone(central Sarasota

Co.)

Sarasota CentralLandfille-Iox(12 wells. central

Sarasota Co.)

Vema well-field(northeast Sarasota

Co.),

1484 272247082175301

2E7 27224808219030212E8 272255082180201

[i

fJI

I

Table 1. Summary of well records and hydraulic properties of the surfICial and intermedlate aquifer systems at selected sites and areas in southwest Ronda --COntinued.... ': ,.[EWD, Englewood WIIa District; fOS, F10rida Geological Survey; SWFWMD, Southwest Florida Wider Management Di.'Ilri~ ROMP, Regional Observation MlJIIitor" Program; USGS, u.S. Geological Sur-vey; It, feet; WId, feet squared per day; (t'rId)lft, feet per day per foot; ftId. feet per dar. <.Iess than; >, grcatec than; -, no data)

SIte narnWell HydrogeologicC&singldepth or T......... Lookon"" ....... Hydnluiic

She identification Interval below 18nd -. conductivity ..........nu_ ~.' swlaco (tI)

..... (ft'1d)[lft/d""]

cooIflcIent (ft/d)

120... 272255082180202 SAS 530 Geraghty and Miller, Inc.(1981)

6E2 272256082183701 SAS 21/42 160 Do.

9E3A 2722S7082l81702 SAS 20140 150 Do.

Englewood WatetDistrict (southwest

Sarasota Co.):

EWD 265722082210301 lAS PZI 25/40 7,800 O.OOOOS Wolansky and CorralProduction 27 (1985)

EWD 26573S08220S701 [ASPZl 49155 5,soo 0.0007 .00011 Do.Production 9

EWD 270015082211301 [ASPZ1 31nS 1,260 .12 .00087 CH2M Hill, Inc. (1978)Production test 2

EWDRS 270019082213701 IASI'ZI 34192 8,000 .0005 .0004 Do.EWDR3 270021082221301 lAS PZI 42J43 6.2S0 .0004 .0003 Do.

EWD 270033082214201 IASI'ZI 35nO 3,320 .000036 .000016 Do.Production lest 4

EWDC-IO 270036082214101 IASPZl 4'1J7O 3,800 DOO24 .00017 Wolansky and Corral(1985)

EWD 270038082211301 IASI'ZI 35nO 1,525 .005 .OOOOS8 CH2M Hill, Inc. (1978)Production test 5

EWD 270104082214101 lAS I'ZI 4'1J7O 1,608 Do.Production 1est 3

EWD 270107082211201 lAS I'ZI 43f1O 2,970 .013 .0006S Do.Production lest I

VCnicc well field 32 2705360822S3901 lAS I'ZI 421S9 1,100 .0009 Clark (1964)

Carlton RcIc:rve lAS PZ2 811205 2,670 .00013 .0001 Geraghty and Miller, Inc.(central Sarasota (1981)

Co.)

Maname Jr. CoI- 270219082185801 lAS PZ2 1101270 200 1lOOO2 USGS test (1984)

~ lege. IOUIb well

" Plantatioo Utility 270403082220501 lAS PZ2 701180 ''200-400 12.0000196- Pool, Bucldey, Schuh,: 3A .000038 and Jernigan, Inc. (1981)

<:I

>! T.~e 1. Summary of well records and hydraulic properties of the surficial and Intermediate aquifer systems at selected sites and areas in southwest Florida -Continued

[BWD, Eagiewood Water Distrlct; FOS, Florida Geological. Survey; SWFWMD, Southwest Florida WaIer Management District; ROMP, Re,ional Ob.sernltioo Monitor Program; USGS. U.S. Oeol.ogical Sur-% vey; ft, feet; tt2/d. feet squared pel'day; (ftld)lft, feet per day per fOOl; ftId, feet pel" day; <, less than; >. pealer than; -. no dIIta]

I SII. n.me/wefl HydrogeologicCalngfdllpch or

1iwIsml.......... - Hydl'8ullc

.....- an. klentlftcatlon un.' IntervIII below land./VI1)' (It'1d) .......- ooefflcI...

conductivity Ref.......

~.~(n) ((ft/d)IIt) (ftId)

!!. Plantation Utility 4 270405082215601 IASPZ2 66(180 1'250-300 1"0.000045_ Post, Buckley, Schuh,

1 .00001 andJemigan. Inc. (1981).. P1anta1ion Utility 5 270406082215602 lAS PZ2 68/180 300 Do.c

~ ROMP TR5-2 270019082234200 IASPZ2 601100 5,OllO USGS test (1986)&: ROMP 18-1 271J37082074801 lAS PZ2 57nn 10),600 Geraghty and Millec•, (1980)"j ROMP 18-2 271137082074802 IASPZ2 571123 10:3.700 Do.

I ROMP 20 271137082284501 IASPZ2 7S1125 1,800 0.00006 SWFWMD data files

! Venice well-field 2 2705360822S3901 lASPZ2 77/140 5SO .0005 .000042 Post, Bucldey, Schuh.

t and Jernigan,. Inc.(I982b)

i' Venice Gardens 270322082234701 lAS PZ2 6<>'160 12600-650 Geraghty and M"dler

j wel1-fieldTPVG-I (1980)

• Vemce QanIem 270322082234702 lAS PZ2 611160 12450..550 12.00021 _ .00017- Do.• weJl-field .0011 .00062.... MWVG-I•i Vemce """"'"270430082221501 lAS PZ2 6Ul60 400 Do.

I welJ..field'IP-49

1 Vemce """"'"270430082221S02 lAS PZ2 601160 400 .000006 Gemghty and Mille<

well-field MW-49 (1980)

! Vcnioe GardeDa 270508082223301 lAS PZ2 6<>'160 6SO Do.

I .well-field TPN-la

Vemce """"'" 270S08082223302 lAS PZ2 61/160 600 .00043 Do.

~ well-field MWN-l

a Vemce Genlem lASPZ2 87/9(J 1,120 .000248 Geraghty and Miller, Inc.

t well-6cld lA (1974)

3 Venice Gm'dena lAS PZ2 97/150 610 Do.1 well-field 2At Vcnioe G8rdeDa lAS PZ2 1001106 720 Do.

well-fidd3A

Vemce """"'" lAS PZ2 85/130 790 .000175 Do.well-field SA

............... (----~ '.

Tab4e 1. Summary of well records and hydraulic properties of the surficial and Intermediate aquifer systems at selected sites and areas In southwsst Rorida -continued[EWD, Englewood Waf« District; FGS, F10rida Geological Survey; SWFWMD, Southwest Rorida Water Management District; ROMP, ~gionaJ. ObservaD.Q11 Monitor Program; USGS, U.S. Oeologll;i(9J.Ir---vey; ft, feet; at/do rcct Iquared pel day; (ftIcryft, feet per day JlC{ foot; RId, feet per day; <. less thm; >, gremr dumi -, DO data)

ROMP TR 5-2 270919082234200

Cal_orT......

LeokanceStorage

HydraurtCInterval below land

oIvlty(ll"ld)_Iont

coolIlcientconductivity ..........

-(fl) [(It/d)IIll (ftId)

228/366 5,600 0.000035 0.00033 Post. Buckley, Schuh.and Jernigan, Inc.

(1982b)

2601425 8,200 .000085 CH2M Hill. loc. (1980)

2401410 10.000 USGS lest (1986)

250137. 1,700 .00013 SWFWMD data. files2061441 15,400 .00064 Post, Buckley, Schuh.

and Jernigan, Inc.(19820)

.00002 Ryder (1982)

.0004

1001230 60.1 Hutchinson andTrommer(1992)

.000027- Ryder (1982)

.0000067

CDm:J,.'a(J)

'"~-Hutchinson andTrommec (1992)

'104101500

lAS PZ3

IASPZ3

lAS PZ3

lAS PZ3

lAS PZ3

CU1'Z2lPZ3

CUSASJPZI

CUPZ3IUFA

CUPZ3IUFA

Hydrogeologicunit'

270919082234200

2711370822845012705340822609

Site Identification

270407082215801

2657J4082203801

270919082234200

Site namelwellnumblir

Plantation UtilityRQ..Z

EWD ProductionR().Z

ROMP mS-2

ROMPZOVenice well field

RQ.<;

(S,"""", Co.. <tigital flow model)

(Sarasota Co.• digital flow model)

ROMP 1RS-2

j

I~ma!ioa: SAS, surficial~ system; lAS PZI, iDtenncdiate aquIfc;r I}'Item. pcrmc8b1e ZODC 1; lAS PZ2, intcnncdiatt; aquifer system. pcrmcIblc zone 2; lAS PZ3, inlcrmcdiate aquifcc system,permcm1I= JlIDC 3; CU SASlPZl, ccnfining unit bMw-. SAS ..d lAS PZl; CU PZUPZ2, Cl:xIfiDiDa: unit between lAS PZl BDd lAS PZ2: CU Pl:ZIPZ3. confurlng unit between lAS PZ:2 .m:I lAS PZ3; CUPZ3IUFA, Cl:xIfilUDg UDit~ lAS PZ3 BDd UFA; aDd. UFA, Upper Floridan aquifer.

Zsp!it-apooa aamplc. iD feet below land lIllface3ccre umpk. ia feet below Iaad lure's_,,,,,,,'Horizontal hydraulic COIldocti.Wy6vertieaI hydraulic 00Dduc6vity from. model simubtions1Awnge of 3F m IcItI

-Sample did IlOt ICur* If\et 31 days O£ JIlOIe

9Saq4e may have bceu cliaturbcd ia pcnncIIDCtI%10A¥CI'qO of_11 malytical mclhodt for ODC tIlIt11Averap &om 5 aqgifer testsUAvcrap &om lDII1tiple aquifer tells

~CD J

; J

s:o"lJmm""en

:cenG)mQ.0;

0.18

0.85

0.16

0.02

0.02

<0.02

<0.02

<0.02

<0.02

<0.02

<0.02

0.09

<0.02

0.02

<0.02

<0.02

<0.02

<0.02

<0.02

<0.02

<0.02

<0.02

<0.02

<0.02

<0.02

331

441

452

863

467

60

300

so,

98.

.74

".

920

393

1240

1,530

8,760

'"397

&260

413

452

471

•••2,760

51.

14,800

Dluolvedeo'lds(mgIl)

2

,88

32

"

10

28

10

73

100

<02

"840

750

60

Z1

.90

Zl

>l

34

160

860

,1,000

"-

7

32

68

"

43

13

II'

124

192

33,.,

7,000

"

33

140

'250132

7.3,900

IS'54

".68

145

38

ChI .......

(m"" ( )

7.'

7.1

'.7

6.7

'.3

••••••

7.4

7.3

7.'..,6..

6.7

6..

,~

7.'

'.7

7.1

7.0

4.'

•••4.''A'.3

7.0

pH(units)

786

102

1,1)90

.,0

1,200

."

681

22,000

630

1.460

606

1,867

1,444

S1.

'"1,862

13,600

1260...13,1JOO

.13

m

74'I2SO~860

m

32.4

23.'26.,

28.7

27.0

26.'

24.'

25.'

28.2

27.6

262

29.7

31.1

26.7

25.'

27.'

27.7

25.2

26.7

273

26.'

26.1

28.'

26.'

23.'

Tempo.......l"c)

11-4-93

11-4-93

8-26-93

11-4-93

6-23-93

8-11-93

&-02-93

6-24-93

6-24-9'

6-24-9'

11-4-93

7-29-93

6-23-93

11-4-93

7-29-93

8-19-93

8-26-93

9-21-93

9-22-93

9-22-93

9-22-93

9-22-93

9-22-93

9-23·93

9-27-93

9-28-93

Somple00'_-SAS

SAS

SAS

SAS

'AS

'ASSAS

'AS'ASSAS

SAS

'AS

'AS

SAS

SAS

'AS'AS'ASSAS

'A'SA''ASSAS

SAS

'AS

'AS

.......geologic....

'"719

719

-/10

--110

-120

--125

-110

--130

--114

··/19

-114

--120

--120

10/12

-142

12132

10/1'

10/12

'''''''1612.

421SO

8113

SltenlUM

EWDTII-14A

EWDSA·l

Iloa<b Combo<"""

""""Myakka Pinel GolfOub

ROMPTRS-2SAS

EWDEWT·5

Faith Baptist 01un:h

YeDt::lla Bay PIau

c......0..........

.........--""""""

270920082283101 Casu Boniw

2707200R221S801 Bcsosa

270511082271701

2658390B2211301

2659S0082183401

270642082264201

265910082220101

270416082250501

26592S082240501

270017082231001

27{1116082243601

2703340822S3501

27<I3OllOIl22l2801

210919082234201

270113082223303

""'4OIl220240226571200220S702

2707320822.51101

II

10 27032S082262S01 CupenoD Beach

270401082191201 Ramb1cl"s Rest

no.

131

12 270S42082261804 'mUce 'Itst 38

13 270722082281001 Nokomis Beaeh

14 271052082294401 Blactbum PoiDr:

I' 27t1S2082264601 Palmer Ranch

40 26571<4082212301 Comm. Presby. ChmclJ

130 XlII370B2284505 ROMPTR20SAS

."

139

170

142

180

196

198

199

200

201

202

20'

204

""206

1ffI

14'

.....

S'

Ii

fII

;: Table 3. Well records for ground-water sampling network and ground--water quality data in southwest Sarasota County, 1993

(c. degrees CdtiWII; EWD, fl.Dslewood Water District; mSlcm, mk:losiemens per ccDtimetu 81 25 •c; mgIL. milJ.i&rams per liter, <. less than; -, DO data; ROMP, Regioual Observation Monito£Pro~:t SAS, surfk:iaI aquifer 1}'Dm' lAS PZl,in~aquifer system pc:nnWl1ll UIIlIl 1; lAS PZ2, intennIldiate aquifer l)'llem penneable zone 2; lAS PZ3, iDlemIediale aquifer system permeable zone 3; iDdex'& numbers mfu to filt- 24J

f!l.1

i!.

IEl'

1

84 Xl1141082293401 Cobb

88 270841082261301 PWcy

90 270716082273101 Balls

30/55 lAS PZI

4S168 lAS PLI

41175 lAS PZl

7..()7·93

7-09-93

7-02-93

25.1

24.7

25.1

1,078

883

~'4O

73

7.'7.0

64

48

210

2SO

200

810

7.7

'"1,850

f.2i'< 'j

tCD'::JCD's:0,

, "'0,CD,CD'

Table 3. Well records for ground-water sampling network and ground-water quality data in southwest Sarasota County, 1993 -Continued ""["c, degrees Celsius; EWD. Englcwood Watez" District; mSlcm, miausiemens pcfCCJ:lDllM:ter at 2S ·C; mgIL, milligrams per tiler: <, less than: -, no data; ROMP,~Observation Monitor f'rogrm1;<-en'

SAS, aurfieial aquifer' .,Item; lAS PZI, iaIermlldiate aquifer system pctmeahlc zaoe 1; lAS PZ.2, iDtennediate aquifer system permeable zone 2; lAS PZ3. intennediaIe aquifer .yslcm penneable ZODe 3: Index CQUmbcn refer to iiI: 24] enIn'" SIlo Coslnt/ Hyd<o- S...... Temp-

_.pH Chlortdll Su_ DI.......

~+N03 G).......... - _,. col_on ........ conduct8nce solid.no._.....

(units) (mgIL) (mgIL) (mgIL as N} 'CD(feet) un' - re) (J<SIcm) (mgIL) 0

91 2705320B2270801M_

6016S lASt'Ll HJ1-93 25,8 966 1A 62 46 61. O!'"93 270635082253101 '''''"'''''' 421<> lAS PZI 1.()7-9l 24,8 1,874 72 170 600 1,420 0";!!!.

97 270427082240201 """""" """ IASPZI 7.Q1·93 ""6 78. U " OJ 468 en103 270041082230401 BIlJlewood Tenrti! Club 991130 lAS PZl 7-02-93 25,6 1.140 '" 2S2 IS nl c:lOS 265856082215001 """"""" 63170 IASPZI ""'.3 24,6 674 '" 57 2 431 <'CD107 26S9S9082183701 Myakka Pines Golf Cub 421100 IASPZI lJ.19-93 25,0 ~860 U 710 1,780 "'<

110::0

,60 270113082223302 BWDJlPZ" <0170 IASPZl <>24-93 23,6 1,162 72 176 24 766 ~162 265717082210301 BWDProd 14 S6I82 IASPZI <>28-93 25,7 820 7,' 76 130 '" CO'163 270111082211602 BWDJlPZ,1 1021130 lAS PZI 7-<M3 28,1 810 U 54 14 m 0>:, ,

","'164 270004082223801 BWDJlPZ,. <0170 IASPZl <>28-93 261 '''''' '" 1,820 260 3,410 0'

Ol168 263826082201301 BWDTII-13 49190 IASPZI 6-28-93 24,1 1,980 M "0 33 1,270 '";...169 26S1lO9OI2194001 BWDTH'" 4S16S IASPZI <>24-93 23.• ~020 6.6 480 40 1,330 ""174 270140082240701 1«JlPC*i 0ardcDs 7 601104 IASPZI 7-29-93 25.0 1,088 7.7 144 7 1,410

176 27<l8OIlOlt2270504 ROMPTRS-l UH 4<YS9 IASPZI 6-22-93 2M 1,400 7,1 160 280 1,040

181 2'J0406082210104 PlIDtatioa MW2-PZl '216S lAS PZl 7-06-93 28.0 914 7.' 104 160 '.3

18' 27074~1 ...... 42160 IASPZI 7-16-93 24.4 ~6OO 7.2 188 1,200 2,2SO

184 165943082183901 MyIkka Pinel Golf Oub ""''' IASPZl 7-30-93 260 1,651 .7 230 " 1,080

'88 270637082233701 ........ 331SO IASPZI 8-10-93 24.' 701 72 48 20 486

189 2704290822S3101 ......" 4"" IASPZI ..,.,93 26• 1,229 72 144 8 813

190 270216CJ822.4'201 """"""'" 3S18O IASPZI 8-10-93 252 802 72 54 <1l.2 51.

" 27112S082292901 """ 6819' IASPZ2 <>28-93 25.8 ~ISO 7.4 " 1,1lOO 1,950

54 271137082284304 ROMP 20 UH 13/125 1ASPZ2 1-30-93 24.8 1,790 7.4 " 140 1,SllO

86 27~1 -- 68/194 1ASPZ2 <>28-93 25" 3,670 7.0 m 1,600 3,400

57 2711590822S4901 ""- 42/108 1ASPZ2 8-04-93 24.7 1,302 7.2 100 300 1,000

" 270901082281101 c....,c 1llY1l0 1ASPZ2 6-28-93 25.8 1,464 7.2 124 320 1,100

~ 62 270922082261801 v.n1n1 56f116 1ASPZ2 <>28-93 25.6 1,276 .7 96 310 961

f 63 27092S0B2243901 .rod< 38190 1ASPZ2 7-02-93 24.4 1,331 .7 60 440 1,070

69 210441082270801 [,0" IllYISO 1ASPZ2 7-02·93 25.• 1.tl92 7.2 92 260 772::l

"'0Dl

CD<Xl

'"

~"CD :.

':5:''0'"tlm

'm"'"i I

~ Table 3. Well records for ground-water sampling network and ground-water qUality data In southwest sarasota County, 1993 -COntinued C• (f)(c. degree,I CcWuI; EWD, Eaj:Iewood Water District; mSlcm, microsiemcns percentimeter It 2S'c: mgIL, milIiJl1llDS pel" Jiter, <,.lcss thaD; -, DO data; ROMP, Regional ObSClVatiOll Monitor Program;

i SAS, amficlaI. aquifer-JyItI::m; lAS PZt, in1amcdiate aquUCf system pcnncabie~ 1; lAS PZ2, iDlclmediatc 1Iquifel-1)'l1em pcm:wlBbie zoae 2; lAS P'Z1, inrennediare aquifer syszm. petmelble ZOllC 3; iDdex 'G'Jnumben rmrlo fig. 24)

;CD0

f ...... ... Cuing{ Hydro- ........ T..... ....lIlepH Ct<_ SU....

Dieeolved No',NO' 0

.r_on ........ ..... ......Ic colloctlon ....... conductonce

(unit:ll) (m!>'L) (m!>'L).oIlds

(mgll. as N) '"no.(loot) .... - rCI

_II.-I rr

~ !!!.!l. 70 270720082220S01 Holland Landscaping .2183 IASPZ2 6-29-93 '''' 831 n .. 160 601

(f)

i 71 2706330B2232301 ..... 531108 IASPZ2 6-29-93 '''" .300 7.0 1<" 1,100 2,22JJ C.. 74 270544082214001 lJIdustriaJ Space, IDe. 701160 IASPZ2 7-16-93 232 2,910 72 400 830 2,190 :<c m.. to<.. '" 2'70'J0'5082252801 I<Dc<b 67/83 IASPZ2 7-07·93 23.' 613 7.6 .. 23 ""j[ ::0

1 108 265817082132.501 """""" 15CV166 IASPZ2 _93 23.0 15,100 7.' ',920 360 10,300~

I146 27022'70B2253201 ......... 13&U9 IASPZ2 7-02-93 23.1 ... 7.6 164 17 '67 <D

'" 270940082283201_...... ,

63187 IASPZ2 "22-93 23.1 .760 7.1 '" 1,400 2,680 OlJ,.

157 270848082273301 LW ViIJa&e, be. 60194 IASPZ2 ..".., 23.0 1,860 7.1 '" 680 1,.580 0

i 1" Z70&420822S2701 KiDg'I Gate., IDe. 3 63/140 IASPZ2 6-23-93 232 m 05 " 23 376OlW

1 I7l 27054508223<4101 VeDiee Rmeh. 1Dl:. ...., lAS PZ2 8-,.,.93 26.3 1,730 7.' 210 '20 1,260;...

I,..

182 270406082220103 PIIIItatia:I MW4-PZ2 6&180 lAS PZ2 7.Q6.93 23.7 '" 7.7 57 30 316

i '" 270432082231901 VaUce Qaldeq 9 ....123 IASPZ2 8-02-93 23.' '" 7.' 30 18 34'186 1:11022082235701 ""'"" 63181 IASPZ2 ..".93 232 1,202 72 80 260 887

I187 270816082223301 ""'" 42180 IASPZ2 _93 23.3 913 " " 180 680..

I' 191 270619082271601 H_ 701120 IASPZ2 • .Q6.93 23.0 .020 75 130 440 1,750

I 192 210618082245801 Venice B.t1 hrk 51 7OH1 IASPZ2 8-06-93 23.3 2,340 75 263 940 2,07.

• 193 27021308222J301 """"'ood 4OIS' IASPZ2 8-10-9] 24.9 396 7.0 67 16 39.il. 195 2107310B22S 1901 Faith BaptIst Ch. Deep 62196 IASPZ2 8-19-9] T15 ~100

,. 260 1,300 .740

~ 220 27103708228~1 Soulbbay Utility PZ2 601100 IASPZ2 16-30-93 143 1,100 2,100

I 221 271"3082'6'601 CeIItnl Co. Utility PZ2 631200 IASPZ2 16001-93 103 " 61'agc

109 2711]7082284503 ROMP20LH 2501370 IASPZ3 """3 ".0 2,600 6.4 60 1,600 .640a..112 27<1808082270303 ROMP TR 5-1 UI T131289 IASPZ3 6-21-93 T12 .170 7.1 33 1,200 2,120

"Jl 11. 270919082234204 ROMPn.5-ZTPA 3601400 IASPZ3 6-23-9] ".4 2,320 6.9 38 1,300 .620J lIS 27<l607O822627O1 VaUceRO Z 2301430 IASPZ3 _93 26.2 ~680 7.1 766 1,300 ],810

Il7 ~]2082254001 VaUce By-Pus Park 301>'479 IASPZ3 7.Q9.93 26.2 2,260 72 m 720 1,710

'23 21084~]101 ...- ]OOfSSS IASPZ3 -93 26.. 1,347 7.' " 400 1,120

124 270628082244601 Capri Isles GolfOub 3601600 IASPZ3 8-19-9] 23.0 .700 7~ 170 1,400 "20

126 27O'l41082213601 Taylor Rmch Elcm. SCh. 301>'390 IASPZ3 7-09-93 23.. ],320 75 '" 700 .280

.._--"-- ----_.---,.

I, .'....

"tl,mt<a !iCD i

00'...

Table 3. WeH records for ground~watersamplmg network and ground-waler quaflty data In southwest Sarasota County, 1993 -continued

(c. deJf=S Celsius; EWD, Eoglcwood Wiler District; mSlcm. miCC05iemcns pel' centimctCll" 8l2S ·c: mJIL. millipms pef liter; <.Iess than; -, no data; ROMP, RegIonal ObJervation Monitor Progr~ •SAS.1IIriic:iaJ. aquifer I)'Jlem; lAS PLt,ia~.terI)'SIem permeable zoae 1: lAS PZ2, iIltennedbte "IUifer IYItem permsable :r.oDe 2; lAS PZ3,l~ aquifer,Y*Jn permeable zone 3; iDdexnnmben mer to fig. 24J

147 26S713082204401 EWD RO Prod 1 26<>"25 lAS I'Z3 6-23-93 26.5 10,370 7.' 3,2S0 400 7,320

156 Z7OOO5082280201 Scmcruo Sborcs 10 301J3W 1ASP73 6-21.J13 25.7 3390 6.' m 1,700 3,310

301 2M721082204S01 EWDROProd 9 -1372 lAS I'Z3 '6-12-93 3,690 "8 S,033

302 26.f722082205101 EWDROProd 4 -1375 lAS I'Z3 26-22-93 4,200 582 7,700

3Il3 270408082115501 _MM 2451380 1ASPZ3 '7.06-93 26.0 3,700 7.' '89 1,1SO 2,710

304 27m26082260401 Veak:eRO 7 23Q1439 lAS I'Z3 38-26-93 7.2 330 900 1,960

305 270S46082261701 VoDkeRO • """50 lAS I'Z3 '&-10-93 7.3 62S 1,625 2,710

306 270605082262101 VoDkeRO 2A """30 lAS I'Z3 'B-1.,.., 7.3 665 ~125 3,180

307 21064608224'101 VeaieclE 269/405 1ASPZ3 Ja-l0-93 7.3 46' 2,500 ~660

301 270723082243201 """"'''' 1971360 1ASPZ3 'B-20-93 7.3 100 1,700 1,720

309 '1:11029082285901 ........,. Utility I'Z3 22IY_ lAS I'Z3 16-30-93 202 1,630 ~940

ISample c:oIIectaI. by nlility pc:noDDd IDd analyzed by prlVIte IaboraIorics2Sample caUected aDd lIU1yzcd by EqIewood WaIa: Distric:t wc1J.ticld pmt:mJel's1Dlp1e coIJcctcd aDd -)'2Zd by City of VaIicc wdI.·fioId plll'IODDe1

_. SItlI

no. l~cIItlonSI........

CnlngI(feet)

H.......... _collection- cond_co

-)

pH(.....)

Chlortdl au.....(mgIL) (mgIL)

D........ool...(mgIL)

NO'.NO'(mglLaN)

• TabJe4. Ground water-qualfty data collected with a pore squeezer at the Cariton Reserve and Sooth Venice test wells, Sarasota County, Florida, 1992a[UDCOIU01i.datcd clay material is the lOurce ofall water samples. AlbIimiy CODC:CtItrlItions from me South Venice tell wdlll!'C oot1Abooltory data, but were approximated. SAS, surficial aquifer system; lAS,

i~.-prifersystem; V.C., VeDk:e Clay; PZt, permeablll Wl1C I; PZ2,.penneab1ezooe 2: PZ), permeable ZOlIC 3; CU SA3lPZl.eoafiDi.ugunit bctwccD SAS mdIAS PZl; CU PZI!PZ2, confiDing unitbetween lAS PZ1 and lAS PZ2; CU PZ.2IPZ3. confining IlIlil: betwoen lAS Pl2 and lAS PD; CU PZ3IUFA, coafiDinl unit betwccD lAS PZ3 md upper fIoridan aquifer, ft, feet; 1J,SIcm, micnJsiemens per

i cemimr.:tct at 2S"C; mgfL. milliaraw pee lib:r; mgIL, microgwos per ljtel; <, less than; -, DO dIta]

~ SampleHydrogeologic Sample

SpecificAlkallirity Hardness. total

!l. Site Name Site identification depth unit collection dateconductance pH (uni")

(mgIL) (mg/L)

i (ft) (JiS/csm)

r Carlton 270803082210301 20 CUSASJPZI 4-28-92 1,160 6,6 476 350~ Reserve..i 40 CUPZIIPZ2 4-28-92 1,240 6.5 443 375

i (V.C.)

I 48 Do. 4-29-92 1,220 6.8 249 168

i 94 PZ2 4-3(1.92 920 7:l 300 287

•~148 Do. 5-02-92 940 7.9 512 294c

f!I 162 Do. 5-02-92 1,120 7.0 256 256

I 350 PZ3 5-27-92 2,000 7.1 238 1.068

!i 432 CU 1'Z3IllFA 5-28-92 2,120 6.3 443 615

[ South Venice 270340082255401 27 CUSASJPZ1 7-26-92 1.040 448 367

i 72 PZI 8-04-92 640 334 270

f 125 CUPZIIPZ2 8'()8-92 550 252 218('I.C.)

iCUPZ21PZ3 8-19-92 870 268 297f 291

J 304 Do. 8-2(1.92 1.060 245 331

l 373 PZ3 8-21-92 2.080 286 1.067

t

--,:'

•T_... Ground-wmer quality data collected wlth a pore squeezer at the Carlton Reserve and South Venice test welts. Sarasota County, Aorida, 1992-Gontinued[UlICCXIlI01icIIZd clay material. is 1bc IOUlt:e of anw~ SlUDpIes. AlbJ.iDi.ty COIlCCDtrations from tb= South vemee test wcIlare DOt 1aboratoIy data, but _1PPIOXimatOO. SAS, surlicial. aquifer system; IAS,

i.nlenncdillle~ sysrcm; v.c., Venice clay; PZI, permeable ZWIC 1; PZ2., permeable ZODC 2; PZ3,~ zone 3; CU SASlPZl. CUI1I.aiDg unit betwcc:D $AS and lAS PZl; CU PZl1PZ2, confining unitbetwoeu lAS PZI and lAS PZ.2: CU PZ2/PZ3., CODlining unit between lAS PZ.2 IIDd lAS PZ3; CU PZ3IUFA, confiDing unit betweeD lAS PZ3 aDd upper Floridan .:prlfer. It. feet; ,&tan. microsicmens percentimeter, nWL. miIJigrams per liter,~ micrograms pee liter, <, less thaD;_. no data]

S_le Calcium. Magnesium, Sodium, Potassium. Chloride. Sulfate, Iron. Strontium.Nitrogen,

SiteNamc depth dissolved dissolved dissolved dissolved dissolved dissolved dissolved dissolvedND,+ND,.dissolved

(ft) (mgIL) (mgIL) (mgIL) (mgIL) (mgIL) (mgIL) (I'WL) (llgIL)(mgIL)

Carltnn Reserve 20 llO 18 42 4.6 46 140 300 1.200 0.70

40 100 30 61 5.4 65 280 6 1.800 0.80

48 llO 34 48 52 270 80 1.900 0.52

94 68 28 46 6.8 69 31 40 2.000 0.28

148 llO 52 54 14 66 46 1,100 3.000 0.14

162 SO 31 44 8.2 52 52 20 2.80

350 240 llO 38 2.4 20 840 <5 14.000 0.38

432 140 62 140 II 75 660 400 8,800 2.50

South Venice 27 130 to 70 8.3 87 37 140 870 <0.02

72 92 9.5 24 4.2 34 4.0 <5 720 <0.02

125 64 14 24 4.8 45 4.8 130 620 0.30

291 58 36 SO 8.7 100 49 <5 3.900 0.42

304 63 41 69 13 140 90 80 4.700 0.35

373 240 llO 86 to 160 760 30 13,000 0.22

~

f!l

•

rcylel1e MCPeekS. - u.s Geological Survey Rpt 96-4063.lif

, .

i _ .'.~i!,I

I!.I.I: 1",'1'1

hydrogeology of the surficial and intermediate …...hydrogeology of the surficial and intermediate...

Documents