Download - TECHNICAL MEMORANDUM REGARDING EARLY STARTUP
1
To: Ed Hathaway
CC: Project File
AECOM250 Apollo DriveChelmsford, MA 01824aecom.com
Project name:DES Durham Waterline
Project ref: 60614871
From:AECOM Project Team
Date:June 10, 2021
Technical MemorandumSubject: Durham Waterline – Early Startup Using the Durham Center Water System
Introduction
The United State Environmental Protection Agency (EPA), along with the Connecticut Department of Energy and Environmental Protection (CTDEEP), are implementing the component of the Durham Meadows Superfund Site remedial action that involves the establishment of an alternative water supply to those properties impacted by the contamination at the Durham Meadows Superfund Site along with additional properties within a defined groundwater protection zone. These properties are located in the Superfund service area shown on Figure 1 and identified in Attachment A. The remedial action was selected in the 2005 Record of Decision and revised in the 2018 Explanation of Significant Differences.
The remedial design for the alternative water supply project was initially completed in 2016 but was then revised and updated in May 2018 as a result of changes required by the permitting of the water tank. The remedial design was performed by AECOM, under contract to the EPA. The major components of the design include the following, which are also generally shown on the system schematic in Figure 2:
Installation of a new water main to provide water within the Superfund service area and connect to the City of Middletown water supply system.
Connection of about 125 properties to the new water main. Connection of the new water system to the water main of the Durham Center Water Service. Discontinuation of the Durham Center Water Service use of the Fairground Wells and
modifications to the Durham Center Water Service pump house. Installation of fire hydrants along the new water main. Installation of a 797,000-gallon water storage tank in the City of Middletown to provide the water
pressure and storage for the new water main. Installation of a booster station, meter vault, pressure relief valve vault and upgrades to City of
Middletown Long-Hill pump station to support the delivery of water to the Superfund service area. Abandonment of the existing water supply wells, after water service has been initiated, for those
properties within the Superfund service area. Some wells may remain as monitoring wells.
A:COM Imagine it Delivered.
2
Restoration of the roads and properties impacted by the installation activities.
EPA retained the United States Army Corps of Engineers (USACE) to procure and manage theconstruction of the project.
The Durham Center Water System:
This system was formerly owned and operated by the Eastern Connecticut Regional Water Company(ECRWC). The Town of Durham obtained the exclusive water service area and purchased this systemfrom ECRWC in 2002. The Durham Center Division water system is served by two wells located in a fieldbehind the town hall and fairgrounds known as "White's Farm". These wells are known as theFairgrounds Wells. The area surrounding the wells is mounded. The wells first feed into the originalpumphouse which still houses old equipment. This is where raw water taps and meters are located. Thenewer pumphouse (approximately 10 years old) is built into a hillside and located on an access road offMaple Avenue. The new pumphouse houses chlorination equipment (residual at the time of survey was0.94 mg/L), bulkheaded steel atmospheric and pressurized storage tanks (one 15,000-gallon atmospherictank and two 6000-gallon hydropneumatic tanks) and various controls. Booster pumps are twin 10horsepower vertical turbine pumps each rated at 200 gallons per minute. The two wells are gravel packwells with one having an allowable safe yield of 78 gallons per minute and the other having an allowablesafe yield of 76 gallons per minute for a combined capacity of 154 gallons per minute or 221,760 gallonsper day. There is an onsite generator with an automatic transfer switch to provide standby power to thebooster station and wells during utility power interruptions. Water usage at this system peaks during theannual agricultural fair in September every year. Flows were recorded at approximately 95,000 gallonsper day during the highest usage day at the fair.
Under the current CT DEEP operating permit, the withdrawal from the Fairgrounds Wells is limited to50,000 gallons per day. The existing system average daily water demand is about 11,000 gallons per daybut increases to about 14,000 gallons per day during July and August.
The current water billing rate is $6.20 per 1000 gallons.
Proposed Additional Short-Term (less than 1 year) Demand on Durham Center Water System
Water main construction to expand the distribution system in Durham and to connect the expandedsystem to the Middletown system has been largely completed. The next step is to install the individualconnections to the 125 households and businesses for whom the public water will replace the existingprivate wells. EPA is proposing to initiate service for up to 60 homes/businesses whose private wells areimpacted to provide clean water and eliminate the need for the treatment systems and bottled water inthose residences/businesses as soon as possible. The connections will be made at a rate of 1 to 2 perday. The entire process will take up to four months. Under the proposed early start-up, the newconnections, like the existing customers of the existing Durham Center service area, will be supplied bythe Fairgrounds Wells until the connection to Middletown is activated. In addition, by making theseconnections prior to the initiation of water service from the new water tank in the City of Middletown therewill be an increase demand to “turn-over” the tank more frequently to reduce water age. The actual importof water from the City of Middletown is not anticipated to begin early autumn 2021.
The projected average daily demand from the additional 60 water service connections proposed to beadded to the Durham Center water system on a short-term basis is 21,240 gallons per day as indicated inthe attached water demand estimate (Attachment A). The projected average demand is a conservativeestimate based on a residential water usage estimate of 150 gpd for the first bedroom and an additional75 gpd for each additional bedroom, in accordance with the CT DPH Technical Standards. Actual usagein the existing Durham Water Center System has been reported to be significantly less than this amount.This projected water demand added to the existing Durham Center system demand of 14,000 gallons per
3
day results in a combined average daily demand of 35,240 gallons per day. Peak hour demand, which iscalculated to be one third of average daily demand, is estimated to be 11,747 gallons per hour or 196gallons per minute.
Table 1 provides a listing of the applicable operating criteria with the additional water system demand.
Table 1Durham Center Water System Operating Criteria
Criteria Proposed Existing Water SystemAverage Daily Demand (gpd) 35,240 14,000*Maximum Hourly Demand (gph)
(gpm)11,747
19612,000200**
Atmospheric Storage Capacity (gallons)(hours)
15,00010.2
15,00025.7***
Chlorination Requirements+ (gph)(gpd)
0.0800.235
0.0800.093
* Limited to 50,000 gpd by CT DEEP diversion permit withdrawal regulations. 0.2 MGD available fromwells** - Firm capacity with one of two booster pumps out of service*** - Based upon existing 14,000 gpd water demand+ - Based upon a chlorine residual of 1 ppm and un-diluted 12.5% Sodium Hypochlorite Solution
The recently installed water mains to be placed in service under the early start-up plan are indicated inFigure 1. Also indicated are the locations of the valves needed to isolate the section of the water mainsystem to be supplied by the Durham Center water system on a temporary basis.
The highest building that will be served under the early connections is 268 Main St. at a second floorelevation of 230 +/-. The discharge pressure at the booster station (Elev. 176) is 75 psi. The pressure atthe second floor of 268 Main St. should be around 50 psi.
The peak discharge rate from the booster station will not be changing from what is existing (200 gpm) butthe pumps will run for longer periods of time. The chlorination rate will not change but, like the boosterpumps, the length of time and the total amount of chemical (sodium hypochlorite) used per day willincrease.
Durham Center Water System Water Quality
The location of the Fairgrounds Wells and their proximity to the Superfund Site contaminant plume isshown on Figure 3. The extent of the plume was updated in 2020 based on residential well sampling datafrom early 2020 (or, for wells not sampled in 2020, the most recent results from 2019) and the results fromthe sampling of the eight new long-term monitoring (LTM) clusters in late 2020. Based on current and pastdata, the plume has generally been determined to be stable. The LTM wells, shown on Figure 3, will beused for continued monitoring of the plume boundary.
Water quality data collected from the DCWS were also reviewed. The 2019 Annual Consumer Report onthe Quality of Tap Water for the Durham Center Division, included as Attachment B, was prepared by theTown to comply with the Safe Drinking Water Act (SDWA) requirements for a public water supply. Theresults of the annual DCWS sampling indicate that all water quality criteria were met. The report alsoshows that no Site-related contaminants (VOCs and 1,4-dioxane) are present in the water. The most
4
recent results for the DCWS are also available on the Town of Durham’s website at:https://www.townofdurhamct.org/content/28562/27556/27707/default.aspx
In addition, as part of the CT DEEP’s temporary authorization to withdraw more than 50,000 gallons ofwater per day from the Town’s wells during the Durham Fair, the CT DEEP has required that the water betested for VOCs immediately before and after the Durham Fair and for 1,4-dioxane after the Fair. Again,no Site-related contaminants were detected in most recent samples, collected during the fall of 2019,even after the period of the high rate of pumping required by the Fair. The results, including before andafter the Durham Fair, are included as Attachment C. This sampling will be conducted on a monthly basisonce the DCWS starts supplying the additional properties.
Impact of Increased Pumping on Capture Zone
The Fairgrounds Wells on the Durham Fairgrounds property currently supply the Durham Center publicwater system as explained above. The wells, which are screened at the base of the overburden (sandand gravel) aquifer, are located proximal to one another, within a fenced enclosure that is approximately150 feet long by 50 feet wide. As stated above, the withdrawal rate from the Fairgrounds Wells isreportedly in the range of 11,000 to 14,000 gallons per day (gpd), equal to constant-rate pumping at about7.5 to 10 gallons per minute (gpm). Despite years of operation, the wells have not been affected by theSite-related contamination that has affected many residential bedrock wells along Main Street and MapleAvenue, to the east and northeast of the Fairgrounds property.
As up to 60 connections are made over the four-month period, the daily withdrawal from the FairgroundsWells will gradually increase. Following that four-month period, the Fairgrounds Wells may continue tosupply water to the expanded Durham system for an additional three to six months if the water tank is notready to be brought into service. When all 60 new connections have been activated, the averagewithdrawal from the Fairgrounds Wells will have risen from 14,000 gpd (high end of the current range) toan estimated maximum of 32,000 gpd; the estimated increase of 18,000 gpd is based on 60 new connections with a conservative daily use of 300 gallons each. Actual usage is expected to range fromapproximately 150 to 300 gpd. With that net increase, the average total pumping rate would increase toabout 22 gpm. One concern associated with the increased rate of withdrawal is the possibility ofexpanding the capture zone of the Fairgrounds Wells to the extent that it encompasses part of theexisting plume of contamination. The plume is defined as groundwater with a trichloroethene (TCE)concentration >1 ppb.
Note that the daily water demand for the expanded system that was estimated for the purposes ofinfrastructure design, as described earlier in the memorandum (Table 1), is 35,420 gpd, equal to constantrate pumping at about 24.5 gpm. This rate is slightly higher than the estimated long-term averagedemand (22 gpm) that is more appropriate for groundwater modeling.
Even though the water use will increase gradually over several months, it was assumed for modelingpurposes that the full additional demand (from the 60 new connections) will be imposed on the system onthe first day. This assumption, which was necessary for the steady-state modeling of effects of theincreased pumping on the groundwater system, is conservative since it over-estimates withdrawal fromthe Fairgrounds Wells in the first four months.
The overburden aquifer, from which the Fairgrounds Wells withdraw water, pinches out along the base ofthe hill that slopes down from Main Street to just west of Maple Avenue. Only the bedrock aquifer existsas a viable water supply along and to the east of Maple Avenue, and it is within the bedrock that theplume has been delineated based on the residential wells and recently installed bedrock monitoring wells.Samples from bedrock residential wells on Johns Way and on Maple Avenue north of Johns Way have foryears shown high (hundreds of parts per billion) levels of TCE contamination. However, samples frombedrock monitoring wells recently installed into the bedrock (beneath the overburden aquifer) in thefairgrounds area have shown no evidence of contamination. These results suggest that along and just
5
west of Maple Avenue, the plume in the bedrock aquifer rises into the overburden and discharges to AllynBrook or the Coginchaug River/wetland complex. This concept is supported by the detection ofcontamination in Allyn Brook, and in a sample of groundwater from immediately beneath the streambed,just west of Maple Avenue. Although no overburden monitoring wells (and therefore no groundwaterquality data) exist in the fairgrounds area, the available data suggest that low levels of contamination maybe present. To the west of Maple Avenue, the position of the edge of the plume in bedrock (defined byTCE at a concentration of 1 ppb) is estimated as shown on the figures.
Over the last several years, as part of the long-term monitoring requirements for the Site-WideGroundwater Study area, a groundwater flow model was constructed to try to predict changes ingroundwater flow directions and patterns that might occur as private wells are replaced by public water.The model was focused on simulating groundwater flow in the fractured bedrock aquifer; however, theoverburden aquifer was included by necessity since it is part of the groundwater flow system.
Although the model covers a large area and cannot be used to predict “small scale” changes ingroundwater flow directions, it can be used to generally predict how the flow system will respond tochanges in groundwater withdrawals. Therefore, the model has been used in this case to estimate theeffects of the proposed increase in pumping from the Fairgrounds Wells. Three simulations weresimulated to explore various pumping rates at those wells. The first simulation considered currentpumping rates. A rate of ~9 gpm, which is near the high end of the range of current water use (7.6 to 9.7gpm), was used to conservatively simulate existing conditions. The second simulation considered theproposed Fairgrounds pumping rates (~22 gpm) with all 60 new connections made. The third simulationconsidered an arbitrary higher pumping rate (30 gpm) simply to visualize the potential impacts of ahigher-than-anticipated withdrawal rate (this rate exceeds the infrastructure design rate by about 20percent).
Figure 4 compares the three simulations. Groundwater contours (purple lines, 20-foot contours) andforward tracking particles from DMC and MMC (left) are shown. Particles are also tracked backward fromthe Fairgrounds Wells (combined) to depict a capture zone. The first simulation (~9 gpm) is shown at topleft. On the top right, the same particles are shown for a case where pumping rates at the FairgroundsWells are increased to ~22 gpm. On the bottom right, pumping rates at the Fairgrounds Wells areincreased to 30 gpm.
For the 9 gpm case (existing conditions), the capture zone includes the overburden aquifer to the east ofthe wells. Near the edge of the overburden aquifer, the capture zone includes groundwater from thebedrock aquifer. However, it remains south of the southern edge of the plume footprint (as mapped in2020), and no contamination is captured as historical sampling has shown. Based on a visualassessment comparing the edge of the plume footprint and the 9 gpm capture zone, there is nocontribution of the plume to the Fairgrounds Wells. These results are consistent with actual conditions,since no plume contaminants occur in samples from the Fairgrounds Wells.
For both the 22 gpm and the 30 gpm simulations, the capture zone (as represented by backtrackedparticles) extends incrementally farther to the east and northeast toward the estimated edge of the plumefootprint, but it does not reach it. Like the 9 gpm case, the southern part of the capture zone extends intothe bedrock aquifer at its eastern extremity but remains south of the plume footprint. The northeasternpart of the capture zone stays within the overburden, indicating that the groundwater that is captured bythe supply wells in the simulations in that area originates as recharge to the overburden aquifer. Basedon a visual assessment comparing the edge of the plume footprint and the 22 and 30 gpm capture zones,there is no contribution of the plume to the Fairgrounds Wells. As noted above, the extent of the plume inthe overburden west of Maple Avenue is not known due to the absence of monitoring wells; however, it is important to note that even if low levels of contamination are present and captured by the FairgroundsWells, two mitigating conditions exist: 1) time to travel (i.e., ~7 years minimum) from the edge of thecurrent plume extent to the Fairgrounds Wells is in excess of the time the Fairgrounds Wells’ rates maybe increased (on the order of months but less than a year); 2) the contaminated water would be a small
6
part of the total volume of captured water and would therefore be heavily diluted in the output from thetwo wells.
In addition to those two mitigating conditions, the modeling methodology was conservative. As notedabove, the increase in withdrawal from the Fairgrounds Wells from 9 to 22 gpm will actually be gradualand not instantaneous as modeled, so the actual duration of time at peak pumping will be shortercompared to the steady-state simulation. Also note that the model is a groundwater flow model andsimply predicts changes in groundwater flow directions due to variations in aquifer stresses. It is not acontaminant transport model and therefore does not predict decreases in plume strength that would resultfrom degradation and dilution of contaminants.
In conclusion, the model was used as a screening-level tool to evaluate changes in capture zone withchanges in pumping rates at the Fairgrounds Wells. The proposed increase in pumping from theFairgrounds Wells from 9 to 22 gpm generates a commensurate expansion of capture zone, and thenortheast part of the expanded zone comes close to the estimated edge of the existing plume as mappedbased on 2019/2020 data, but it does not overlap it.
Furthermore, the model indicates that the groundwater captured by the wells consists mainly of water thatoriginates as recharge to the overburden aquifer and does not include significant amounts of water thatrise into the overburden from the bedrock aquifer, where the plume is present along Maple Avenue. Theuncertainty regarding the levels of contamination in the overburden aquifer could be largely eliminated bygroundwater profiling and monitoring well installation and sampling. The uncertainties associated withgroundwater modeling, in general, cannot be eliminated because modeling includes assumptions tosimplify a complex process. The model assumes homogeneity when in fact there is significantheterogeneity that cannot be captured in the model. Specifically, groundwater flow in the bedrock ismostly governed by fracture flow. However, the model assumes that groundwater flow in the bedrock isgoverned by primary porosity. This approximation can yield inaccuracies in the predictions. Predictionsshould be tested with additional field data. If for instance, pumping at the Fairgrounds Wells is increased,additional sampling of wells located between the edge of the plume and the Fairgrounds Wells may berecommended to monitor any changes in water chemistry that may suggest plume migration.
Contingency Measures
To confirm that water quality from the Fairgrounds Wells remains unimpacted during the period ofincreased pumping, a program will be implemented by the EPA to conduct monthly sampling of theFairgrounds Wells for VOCs and 1,4-dioxane. In the event that any detections of Site-related VOCs or1,4-dioxane are observed, or should any other operational problems associated with the increasedpumping occur, actions will be taken to change over to the Middletown water supply.
As shown in Figure 1, valves will be in place to remove the DCWS from service and put Middletown intoservice. As previously discussed, it is very unlikely that the bedrock groundwater contamination in theDurham Meadows Superfund Site would impact the water quality of the Durham Center Water Service asa result of this short-duration increase in demand. If contamination was detected in the Fairground Wells,it has been determined that, in an emergency, sufficient infrastructure is currently in place to supply waterfrom Middletown while construction of the remaining support facilities is being completed.
It is recommended that upgrades to the Long Hill Pump Station be prioritized for completion to allow forimproved operation, should an emergency switch-over be required. The variable speed operation of thelarge pumps at the Long Hill Booster Station would allow better control of the feed from this system tomatch the needed water demand.
7
Summary
The information in this memorandum is based on known conditions at the time of development. Thenumber of properties included in the evaluation is the maximum and the actual number of connections tothe DWCS using the Fairgrounds Wells could be fewer than 60. The number of properties to beconnected will be re-evaluated as demand on the system increases when new connections are added. Itis assumed that the system operator (the Town of Durham) will coordinate with the CT DPH to addressany changes in testing or operation of the Durham Center Water Service.
8
FIGURES
Proposed Temporary Additional Durham Center Service Area Figure 1 -
\
se Va lve 1 1 ~- -r. __ ....,
x • Valve Existing Durham Cent New W er System
ate, Main to be ~aced n SerVI
New Water Main not m Se . ce rv,ce
~ =J, I .
10
Figure 2. Durham Waterline System Components
JS Roth River Road Wells and
Treatment Facility
Existing long Hill Water Tank
j Water Tank I
Talcott Ridge Booster Station
·EL 442 20" -2318'
••. Takon Ridge : Cul de Sac
.: EL 410 ......
I 16" 3718' Mam St
Durham Meadows Waterline
Schematic Drawing
Strong Middle
School
Connection to Existing Water
Main
M ill Pond Lil Allyn Brook
Durham ■ ■ I CenterWater
'- .. ~=:=.;;::::==:;::::!.!::;;::::::;;::::::=::::::::::::::=:!..!::4:::7:::4:;:' :::16=·== ' fl ■ ~2-;. _.._ ■ 8; ■ ■
II Durham
■ System
•• • 8" 1987' 12" 2065'
Maple Ave Maple Ave
11 Library
II
II 12"
II
II
■ ;:
■J • t .~
• ■ Connection to Existine Water
GROUNDS
!(!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
!(
Main St
Maple Ave
Cherry Ln
Maiden Ln
Brick Ln
New H
aven R
d
Higganum Rd
Madison Rd
Haddam Quarter Rd
Wallingford Rd
Middlefield Rd
Oak Ter
Pickett Ln
Guilfo
rd Rd
Guire Rd
S End
Ave
Fowler Ave
Whee
ler H
ill Dr
Magner
Ln
Partridge Ln
Steph
anie
Ct
Woodland Dr
Talcott LnMarina Pl
Town House Rd
Hamlet Manor
Edwards Rd
Old Cemetery Rd
Birch Mill Rd
Cesca Ln
Main St
Parmelee Hill Rd
9
8
4
1
5
76
3
2
10
HS
HH
FG-2
FG-1
MW-6MW-4
MW-2
DMC-2 DMC-1
C:\W
ork\60
6148
71DU
R\Ma
ps\Fi
gure
3 Rec
omme
nded
LTM.
mxd
I
0 600 1,200300Feet
FIGURE 3.Contaminant Plume Boundary
and LTM Well LocationsLegend!( Existing Well to be Used for LTM!( Recommended New LTM Well
Groundwater Management ZoneGroundwater PlumeBall Brook Fault Property lines are based on Town
of Durham Assessor Maps.
FairgroundWells
----
!!
!!
!
!
!
!!!
!!
!!
!!!
!!
!
!
C:\W
ork\60
6148
71DU
R\Ma
ps\C
ompa
reFlow
Paths
.mxd
I0 610 1,220
Feet
FIGURE 4.COMPARING FLOW PATHSFOR VARIOUS PUMPING
RATES AT THEFAIRGROUND WELLS
LegendWater Supply WellsBall Brook FaultRiversDrainsSimulated GroundwaterElevation Contour(20 ft contours)1 µg/LTCE in Bedrock GroundwaterContour (Dashed where inferred)
Alluvial Sand and Gravel (Layer 1)Till (Layer 2)Till (Layer 3)Bedrock (Layer 4)Bedrock (Layer 5)Bedrock (Layer 6)
! Particle Starting LocationArea of Wells to be Abandoned
1 inch = 1,200 feet
Hamlet Manor
DMC
MMC
Fairgrounds
30 gpm
150
150
170190
190210
210 230
")
!!
!!
!
!
!
!!!
!!
!!
!!!
!!
!
!
Hamlet Manor
DMC
MMC
Fairgrounds
22 gpm
150150
170190
190210
210 230
!!
!!
!
!
!
!!!
!!
!!
!!!
!!
!
!
Hamlet Manor
DMC
MMC
Fairgrounds
9 gpm
150150
170190
190210
210 230
AECOM [SSSl
ATTACHMENTS
Attachment A
Item
Number
Drawing
Number Address Connection Type
Number of
Bedrooms
Water
Demand
(GPD)
1 C‐19 257 Main Street Water Service Single Family 4 375
2 C‐19 261 Main Street Water Service Single Family 2 225
3 C‐19 262 Main Street Water Service Single Family 2 225
4 C‐19 265 Main Street Water Service Single Family 3 300
5 C‐19 267 Main Street Water Service Single Family 4 375
6 C‐19 268 Main Street Water Service Single Family 4 375
7 C‐21 11 Maiden Lane Water Service Single Family 2 225
8 C‐21 17 Maiden Lane Water Service Single Family 2 225
9 C‐21 203R Main Street Water Service Durham Mfg.‐see item 38 ‐
10 C‐21 205 Main Street Water Service Ambulace Corps. 300
11 C‐21 208 Main Street Water Service Two Family 4 450
12 C‐21 215 Main Street Water Service Two Family 6 600
13 C‐21 216 Main Street Water Service Single Family 6 525
14 C‐21 220 Main Street Water Service Single Family 4 375
15 C‐21 227/227A Main Street Water Service Two Family 4 450
16 C‐21 228/228R Main Street Water Service Church Center 300
17 C‐21 233 Main Street Water Service Single Family 2 225
18 C‐21 235 Main Street Water Service Three Family 6 675
19 C‐21 236 Main Street Water Service Church 300
20 C‐21 238 Main Street Water Service Two Family 4 450
21 C‐21 239 Main Street Water Service Single Family 3 300
22 C‐21 242 Main Street Water Service Two Family 5 525
23 C‐21 243 Main Street Water Service Office 300
24 C‐21 246 Main Street Water Service Single Family 3 300
25 C‐21 248 Main Street Water Service Single Family 4 375
26 C‐21 252 Main Street Water Service Single Family 4 375
27 C‐21 253 Main Street Water Service Single Family 3 300
28 C‐21 256 Main Street Water Service Single Family 5 450
29 C‐23 174 Main Street Water Service Single Family 3 300
30 C‐23 167 Main Street Water Service Single Family 3 300
31 C‐23 168 Main Street Water Service Two Family 6 600
32 C‐23 175R Main Street Water Service Single Family 3 300
33 C‐23 176 Main Street Water Service Single Family 3 300
34 C‐23 177R Main Street Water Service Single Family 3 300
35 C‐23 186 Main Street Water Service Single Family 3 300
36 C‐23 188 Main Street Water Service Single Family 5 450
37 C‐23 196 Main Street Water Service Church 300
38 C‐23 199 Main Street Water Service Durham Mfg. 1,440
39 C‐23 201 Main Street Water Service Office 0 300
40 C‐23 202 Main Street Water Service Single Family 4 375
41 C‐27 10 John's Way Water Service Single Family 3 300
42 C‐27 13 Maple Avenue Water Service Single Family 4 375
43 C‐27 29 Maple Avenue Water Service Single Family 3 300
Durham Meadows Early Connection Water Demand Estimate
Item
Number
Drawing
Number Address Connection Type
Number of
Bedrooms
Water
Demand
(GPD)
Durham Meadows Early Connection Water Demand Estimate
44 C‐29 109 Maple Avenue Water Service Single Family 3 300
45 C‐29 110 Maple Avenue Water Service Single Family 5 450
46 C‐29 97R Maple Avenue Water Service Single Family 3 300
47 C‐31 134 Maple Avenue Water Service Single Family 3 300
48 C‐31 119 Maple Avenue Water Service Single Family 2 225
49 C‐31 126 Maple Avenue Water Service Single Family 3 300
50 C‐31 129 Maple Avenue Water Service Single Family 3 300
51 C‐31 133 Maple Avenue Water Service Single Family 3 300
52 C‐31 146 Maple Avenue Water Service Single Family 3 300
53 C‐31 148 Maple Avenue Water Service Single Family 3 300
54 C‐31 17 Wallingford Road Water Service Single Family 3 300
55 C‐31 22 Wallingford Road Water Service Single Family 1 150
56 C‐31 47 Wallingford Road Water Service Single Family 3 300
57 C‐37 18 Maiden Lane Water Service Single Family 3 300
58 C‐37 19 Maiden Lane Water Service Single Family 3 300
59 C‐37 24 Maiden Lane Water Service Single Family 3 300
60 C‐37 29 Maiden Lane Water Service Single Family 4 375
Total Average Daily Water Demand (Gallons per Day) 21,240
Attachment B
2019 Annual Consumer Report on the Quality of Tap Water for the Durham
Center Division Is my water safe?
We are pleased to present this year's Annual Water Quality Report (Consumer Confidence
Report) as required by the Safe Drinking Water Act (SDWA). This report is designed to provide
details about where your water comes from, what it contains, and how it compares to standards
set by regulatory agencies. This report is a snapshot of last year's water quality. We are
committed to providing you with information because informed customers are our best allies.
Do I need to take special precautions?
Some people may be more vulnerable to contaminants in drinking water than the general
population. Immuno-compromised persons such as persons with cancer undergoing
chemotherapy, persons who have undergone organ transplants, people with HIV/AIDS or other
immune system disorders, some elderly, and infants can be particularly at risk from infections.
These people should seek advice about drinking water from their health care providers.
EPA/Centers for Disease Control (CDC) guidelines on appropriate means to lessen the risk of
infection by Cryptosporidium and other microbial contaminants are available from the Safe
Water Drinking Hotline (800-426-4791).
Where does my water come from?
The Durham Center Water System is supplied by groundwater pumped from two wells located
within the Town of Durham. Wells #1 and #2 are 6 inch diameter screened wells. Both wells
obtain water from stratified glacial drift deposits located on the White Farm within the
Coginchaug River valley. Customers have been provided with water from the wells since 2007.
The water system serves approximately 40 properties, mostly residential but some are
commercial, including the Durham Agricultural Fair Association.
Source water assessment and its availability
The State of Connecticut Department of Public Health has completed an assessment of our
drinking water sources and has assigned an overall rating of "high". This rating indicates that our
water sources have a high risk of contamination primarily as a result of the proximity of the
wells to the Coginchaug River's floodplain and the Durham Agricultural Association's
fairgrounds. However, the completed "Groundwater Under the Direct Influence of Surface
Water" study concluded that the Durham Center Water System wells #1 and #2 are not under the
direct influence of the Coginchaug River.
Why are there contaminants in my drinking water?
Drinking water, including bottled water, may reasonably be expected to contain at least small
amounts of some contaminants. The presence of contaminants does not necessarily indicate that
water poses a health risk. More information about contaminants and potential health effects can
be obtained by calling the Environmental Protection Agency's (EPA) Safe Drinking Water
Hotline (800-426-4791). The sources of drinking water (both tap water and bottled water)
include rivers, lakes, streams, ponds, reservoirs, springs, and wells. As water travels over the
surface of the land or through the ground, it dissolves naturally occurring minerals and, in some
cases, radioactive material, and can pick up substances resulting from the presence of animals or
from human activity:
microbial contaminants, such as viruses and bacteria, that may come from sewage treatment
plants, septic systems, agricultural livestock operations, and wildlife; inorganic contaminants,
such as salts and metals, which can be naturally occurring or result from urban stormwater
runoff, industrial, or domestic wastewater discharges, oil and gas production, mining, or farming;
pesticides and herbicides, which may come from a variety of sources such as agriculture, urban
stormwater runoff, and residential uses; organic Chemical Contaminants, including synthetic and
volatile organic chemicals, which are by-products of industrial processes and petroleum
production, and can also come from gas stations, urban stormwater runoff, and septic systems;
and radioactive contaminants, which can be naturally occurring or be the result of oil and gas
production and mining activities. In order to ensure that tap water is safe to drink, EPA
prescribes regulations that limit the amount of certain contaminants in water provided by public
water systems. Food and Drug Administration (FDA) regulations establish limits for
contaminants in bottled water which must provide the same protection for public health.
How can I get involved?
We encourage public interest and participation in our community's decisions affecting drinking
water. The Durham Water Commission meetings are held in the evening at the Town Hall.
Please see the Town of Durham's website for meeting date, times and agendas.
Water Conservation Tips
Did you know that the average U.S. household uses approximately 400 gallons of water per day
or 100 gallons per person per day? Luckily, there are many low-cost and no-cost ways to
conserve water. Small changes can make a big difference - try one today and soon it will become
second nature.
• Take short showers - a 5 minute shower uses 4 to 5 gallons of water compared to up to 50
gallons for a bath.
• Shut off water while brushing your teeth, washing your hair and shaving and save up to
500 gallons a month.
• Use a water-efficient showerhead. They're inexpensive, easy to install, and can save you
up to 750 gallons a month.
• Run your clothes washer and dishwasher only when they are full. You can save up to
1,000 gallons a month.
• Water plants only when necessary.
• Fix leaky toilets and faucets. Faucet washers are inexpensive and take only a few minutes
to replace. To check your toilet for a leak, place a few drops of food coloring in the tank
and wait. If it seeps into the toilet bowl without flushing, you have a leak. Fixing it or
replacing it with a new, more efficient model can save up to 1,000 gallons a month.
• Adjust sprinklers so only your lawn is watered. Apply water only as fast as the soil can
absorb it and during the cooler parts of the day to reduce evaporation.
• Teach your kids about water conservation to ensure a future generation that uses water
wisely. Make it a family effort to reduce next month's water bill!
• Visit www.epa.gov/watersense for more information.
Cross Connection Control Survey
The purpose of this survey is to determine whether a cross-connection may exist at your home or
business. A cross connection is an unprotected or improper connection to a public water
distribution system that may cause contamination or pollution to enter the system. We are
responsible for enforcing cross-connection control regulations and insuring that no contaminants
can, under any flow conditions, enter the distribution system. If you have any of the devices
listed below please contact us so that we can discuss the issue, and if needed, survey your
connection and assist you in isolating it if that is necessary.
• Boiler/ Radiant heater (water heaters not included)
• Underground lawn sprinkler system
• Pool or hot tub (whirlpool tubs not included)
• Additional source(s) of water on the property
• Decorative pond
• Watering trough
Source Water Protection Tips
Protection of drinking water is everyone's responsibility. You can help protect your community's
drinking water source in several ways:
• Eliminate excess use of lawn and garden fertilizers and pesticides - they contain
hazardous chemicals that can reach your drinking water source.
• Pick up after your pets.
• If you have your own septic system, properly maintain your system to reduce leaching to
water sources or consider connecting to a public water system.
• Dispose of chemicals properly; take used motor oil to a recycling center.
• Volunteer in your community. Find a watershed or wellhead protection organization in
your community and volunteer to help. If there are no active groups, consider starting
one. Use EPA's Adopt Your Watershed to locate groups in your community, or visit the
Watershed Information Network's How to Start a Watershed Team.
• Organize a storm drain stenciling project with your local government or water supplier.
Stencil a message next to the street drain reminding people "Dump No Waste - Drains to
River" or "Protect Your Water." Produce and distribute a flyer for households to remind
residents that storm drains dump directly into your local water body.
Additional Information for Lead
If present, elevated levels of lead can cause serious health problems, especially for pregnant
women and young children. Lead in drinking water is primarily from materials and components
associated with service lines and home plumbing. Durham Center Division is responsible for
providing high quality drinking water, but cannot control the variety of materials used in
plumbing components. When your water has been sitting for several hours, you can minimize the
potential for lead exposure by flushing your tap for 30 seconds to 2 minutes before using water
for drinking or cooking. If you are concerned about lead in your water, you may wish to have
your water tested. Information on lead in drinking water, testing methods, and steps you can take
to minimize exposure is available from the Safe Drinking Water Hotline or at
http://www.epa.gov/safewater/lead.
Additional Information for Arsenic
While your drinking water meets EPA's standard for arsenic, it does contain low levels of
arsenic. EPA's standard balances the current understanding of arsenic's possible health effects
against the costs of removing arsenic from drinking water. EPA continues to research the health
effects of low levels of arsenic which is a mineral known to cause cancer in humans at high
concentrations and is linked to other health effects such as skin damage and circulatory
problems.
Water Quality Data Table In order to ensure that tap water is safe to drink, EPA prescribes regulations which limit the
amount of contaminants in water provided by public water systems. The table below lists all of
the drinking water contaminants that we detected during the calendar year of this report.
Although many more contaminants were tested, only those substances listed below were found in
your water. All sources of drinking water contain some naturally occurring contaminants. At low
levels, these substances are generally not harmful in our drinking water. Removing all
contaminants would be extremely expensive, and in most cases, would not provide increased
protection of public health. A few naturally occurring minerals may actually improve the taste of
drinking water and have nutritional value at low levels. Unless otherwise noted, the data
presented in this table is from testing done in the calendar year of the report. The EPA or the
State requires us to monitor for certain contaminants less than once per year because the
concentrations of these contaminants do not vary significantly from year to year, or the system is
not considered vulnerable to this type of contamination. As such, some of our data, though
representative, may be more than one year old. In this table you will find terms and abbreviations
that might not be familiar to you. To help you better understand these terms, we have provided
the definitions below the table.
Contaminants
MCLG
or
MRDLG
MCL,
TT, or
MRDL
Detect
In
Your
Water
Range
Sample
Date Violation Typical Source Low High
Disinfectants & Disinfection By-Products
(There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants)
Haloacetic Acids
(HAA5) (ppb) NA 60 3.5 NA NA 2019 No
By-product of
drinking water
chlorination
TTHMs [Total
Trihalomethanes]
(ppb)
NA 80 12.9 NA NA 2019 No
By-product of
drinking water
disinfection
Inorganic Contaminants
Barium (ppm) 2 2 .389 NA NA 2019 No
Discharge of
drilling wastes;
Discharge from
metal refineries;
Erosion of natural
deposits
Chromium (ppb) 100 100 1 NA NA 2019 No Discharge from
steel and pulp
Contaminants
MCLG
or
MRDLG
MCL,
TT, or
MRDL
Detect
In
Your
Water
Range
Sample
Date Violation Typical Source Low High
mills; Erosion of
natural deposits
Fluoride (ppm) 4 4 .07 NA NA 2019 No
Erosion of natural
deposits; Water
additive which
promotes strong
teeth; Discharge
from fertilizer and
aluminum
factories
Lead - source water
(ppm) NA NA NA NA 2019 No
Nitrate [measured
as Nitrogen] (ppm) 10 10 2.388 NA NA 2019 No
Runoff from
fertilizer use;
Leaching from
septic tanks,
sewage; Erosion
of natural deposits
Sodium (optional)
(ppm) NA 13.4 NA NA 2019 No
Erosion of natural
deposits;
Leaching
Microbiological Contaminants
E. coli (RTCR) - in
the distribution
system
0
Routine and repeat
samples are total
coliform positive and
either is E. coli -
positive or system fails
to take repeat samples
following E. coli
positive routine sample
or system fails to
analyze total coliform
positive repeat sample
for E. coli.
0 NA NA 2019 No
Discharge from
petroleum
factories;
Discharge from
chemical factories
Fecal Indicator - E.
coli at the source
(positive samples)
0 0 0 NA NA 2019 No Human and
animal fecal waste
Turbidity (NTU) NA 5 .35 NA NA 2019 No Soil runoff
Contaminants MCLG AL
Your
Water
Sample
Date
# Samples
Exceeding
AL
Exceeds
AL Typical Source
Inorganic Contaminants
Copper - action level at
consumer taps (ppm) 1.3 1.3 .14 2020 0 No
Corrosion of household
plumbing systems; Erosion of
natural deposits
Contaminants MCLG AL
Your
Water
Sample
Date
# Samples
Exceeding
AL
Exceeds
AL Typical Source
Lead - action level at
consumer taps (ppb) 0 15 1.5 2020 0 No
Corrosion of household
plumbing systems; Erosion of
natural deposits
Additional Contaminants In an effort to insure the safest water possible the State has required us to monitor some
contaminants not required by Federal regulations. Of those contaminants only the ones listed
below were found in your water.
Contaminants State MCL Your Water Violation Explanation and Comment
1,4 Dioxane 0 ug/l No
chloride 31.1 mg/l No
sulfate 17 mg/l No
Undetected Contaminants The following contaminants were monitored for, but not detected, in your water.
Contaminants
MCLG
or
MRDLG
MCL,
TT, or
MRDL
Your
Water Violation Typical Source
1,1,1-Trichloroethane (ppb) 200 200 ND No Discharge from metal degreasing sites and
other factories
1,1,2-Trichloroethane (ppb) 3 5 ND No Discharge from industrial chemical factories
1,1-Dichloroethylene (ppb) 7 7 ND No Discharge from industrial chemical factories
1,2,4-Trichlorobenzene
(ppb) 70 70 ND No Discharge from textile-finishing factories
1,2-Dichloroethane (ppb) 0 5 ND No Discharge from industrial chemical factories
1,2-Dichloropropane (ppb) 0 5 ND No Discharge from industrial chemical factories
Alpha emitters (pCi/L) 0 15 ND No Erosion of natural deposits
Antimony (ppb) 6 6 ND No
Discharge from petroleum refineries; fire
retardants; ceramics; electronics; solder; test
addition.
Contaminants
MCLG
or
MRDLG
MCL,
TT, or
MRDL
Your
Water Violation Typical Source
Arsenic (ppb) 0 10 ND No
Erosion of natural deposits; Runoff from
orchards; Runoff from glass and electronics
production wastes
Benzene (ppb) 0 5 ND No Discharge from factories; Leaching from gas
storage tanks and landfills
Beryllium (ppb) 4 4 ND No
Discharge from metal refineries and coal-
burning factories; Discharge from electrical,
aerospace, and defense industries
Cadmium (ppb) 5 5 ND No
Corrosion of galvanized pipes; Erosion of
natural deposits; Discharge from metal
refineries; runoff from waste batteries and
paints
Carbon Tetrachloride (ppb) 0 5 ND No Discharge from chemical plants and other
industrial activities
Chlorine (as Cl2) (ppm) 4 4 ND No Water additive used to control microbes
Chlorobenzene
(monochlorobenzene) (ppb) 100 100 ND No
Discharge from chemical and agricultural
chemical factories
Cyanide (ppb) 200 200 ND No Discharge from plastic and fertilizer factories;
Discharge from steel/metal factories
Ethylbenzene (ppb) 700 700 ND No Discharge from petroleum refineries
Hexachlorobenzene (ppb) 0 1 ND No Discharge from metal refineries and
agricultural chemical factories
Mercury [Inorganic] (ppb) 2 2 ND No
Erosion of natural deposits; Discharge from
refineries and factories; Runoff from landfills;
Runoff from cropland
Nitrite [measured as
Nitrogen] (ppm) 1 1 ND No
Runoff from fertilizer use; Leaching from
septic tanks, sewage; Erosion of natural
deposits
Radium (combined
226/228) (pCi/L) 0 5 ND No Erosion of natural deposits
Selenium (ppb) 50 50 ND No
Discharge from petroleum and metal refineries;
Erosion of natural deposits; Discharge from
mines
Styrene (ppb) 100 100 ND No Discharge from rubber and plastic factories;
Leaching from landfills
Tetrachloroethylene (ppb) 0 5 ND No Discharge from factories and dry cleaners
Thallium (ppb) .5 2 ND No
Discharge from electronics, glass, and
Leaching from ore-processing sites; drug
factories
Toluene (ppm) 1 1 ND No Discharge from petroleum factories
Trichloroethylene (ppb) 0 5 ND No Discharge from metal degreasing sites and
other factories
Uranium (ug/L) 0 30 ND No Erosion of natural deposits
Contaminants
MCLG
or
MRDLG
MCL,
TT, or
MRDL
Your
Water Violation Typical Source
Vinyl Chloride (ppb) 0 2 ND No Leaching from PVC piping; Discharge from
plastics factories
Xylenes (ppm) 10 10 ND No Discharge from petroleum factories; Discharge
from chemical factories
cis-1,2-Dichloroethylene
(ppb) 70 70 ND No Discharge from industrial chemical factories
o-Dichlorobenzene (ppb) 600 600 ND No Discharge from industrial chemical factories
p-Dichlorobenzene (ppb) 75 75 ND No Discharge from industrial chemical factories
trans-1,2-Dichloroethylene
(ppb) 100 100 ND No Discharge from industrial chemical factories
Unit Descriptions
Term Definition
ug/L ug/L : Number of micrograms of substance in one liter of water
ppm ppm: parts per million, or milligrams per liter (mg/L)
ppb ppb: parts per billion, or micrograms per liter (µg/L)
pCi/L pCi/L: picocuries per liter (a measure of radioactivity)
NTU NTU: Nephelometric Turbidity Units. Turbidity is a measure of the cloudiness of the water. We
monitor it because it is a good indicator of the effectiveness of our filtration system.
NA NA: not applicable
ND ND: Not detected
NR NR: Monitoring not required, but recommended.
positive
samples positive samples/yr: The number of positive samples taken that year
Important Drinking Water Definitions
Term Definition
MCLG MCLG: Maximum Contaminant Level Goal: The level of a contaminant in drinking water below
which there is no known or expected risk to health. MCLGs allow for a margin of safety.
MCL
MCL: Maximum Contaminant Level: The highest level of a contaminant that is allowed in
drinking water. MCLs are set as close to the MCLGs as feasible using the best available
treatment technology.
TT TT: Treatment Technique: A required process intended to reduce the level of a contaminant in
drinking water.
AL AL: Action Level: The concentration of a contaminant which, if exceeded, triggers treatment or
other requirements which a water system must follow.
Variances and
Exemptions
Variances and Exemptions: State or EPA permission not to meet an MCL or a treatment
technique under certain conditions.
Important Drinking Water Definitions
MRDLG
MRDLG: Maximum residual disinfection level goal. The level of a drinking water disinfectant
below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of
the use of disinfectants to control microbial contaminants.
MRDL
MRDL: Maximum residual disinfectant level. The highest level of a disinfectant allowed in
drinking water. There is convincing evidence that addition of a disinfectant is necessary for
control of microbial contaminants.
MNR MNR: Monitored Not Regulated
MPL MPL: State Assigned Maximum Permissible Level
For more information please contact:
Contact Name: William Milardo
Address:
Phone: 8603498253
Attachment C
South Central Connecticut Regional Water Authority 90 Sargent Drive, New Haven, CT 06511-596 Tel. (203) 401-2700
Connecticut Laboratory Cert. ID PH-0411, New York Laboratory Cert. ID 11867
FINAL REPORT
Report Date; 15-AUG-2019 11:13 AM Sample Number: 200540682 ... -.. .._.,, , .. _ ... ______
Subm # : 100173533 Type ; 4520 EFF Customer : -Study : CTWC-OURHAM CENT (Loca): -LOGIN Attn : -
Logged : 16-Jul-2019 07:55 pm ID : EP • DURHAM FAIR WELLS Samp Addr; .. By: ULMER Samp City: -
Categ. ; CTWC-DURHAM CENT Collected: 07/16/19 13:00
3_00702 Loca Desc : LAB
PARAMETER RESULT UNITS RL METHOD COMMENTS
CHLOROMETHANE <.0005 mg/L 0.0005 EPA 524.3
VINYL CHLORIDE <,0005 mg/L 0.0005 EPA 524.3
BROMOMETHANE <.0005 mg/L 0.0005 EPA 524.3
CHLOROETHANE <.0005 mg/L 0.0005 EPA 524.3
1, 1-DICHLOROETHYLENE <.0005 mg/L 0.0005 EPA 524.3
METHYLENE CHLORIDE <.0005 mg/L 0.0005 EPA 524.3
TRANS-1 ,2-DICHLOROETHYLENE <.0005 mg/L 0.0005 EPA 524.3
1, 1-DICHLOROETHANE <.0005 mg/L 0.0005 EPA 524.3
2,2-DICHLOROPROPANE <.0005 mg/L 0.0005 EPA 524.3
CIS-1,2-DICHLOROETHYLENE <.0005 mg/L 0.0005 EPA 524.3
CHLOROFORM 0.0010 mg/L 0.0005 EPA 524.3
1,3,5-TRIMETHYLBENZENE <.0005 mg/L 0.0005 EPA 524.3
1, 1, 1-TRICHLOROETHANE <.0005 mg/L 0.0005 EPA 524.3
1, 1-DICHLOROPROPENE <.0005 mg/L 0.0005 EPA 524.3
CARBON TETRACHLORIDE <.0005 mg/L 0.0005 EPA 524.3
BENZENE <,0005 mg/L 0.0005 EPA 524.3
1,2-DICHLOROETHANE <.0005 mg/L 0.0005 EPA 524.3
TRICHLOROETHYLENE <.0005 mg/L 0.0005 EPA 524.3
1,2-DICHLOROPROPANE <.0005 mg/L 0.0005 EPA 524.3
BROMODICHLOROMETHANE 0.0013 mg/L 0.0005 EPA 524.3
DIBROMOMETHANE <.0005 mg/L 0.0005 EPA 524.3
CIS-1 ,3-DICHLOROPROPYLENE <.0005 mg/L 0.0005 EPA 524.3
TOLUENE <.0005 mg/L 0.0005 EPA 524.3
1, 1,2-TRICHLOROETHANE <.0005 mg/L 0.0005 EPA 524.3
1,3-DICHLOROPROPANE <.0005 mg/L 0.0005 EPA 524.3
TETRACHLOROETHYLENE <.0005 mg/L 0.0005 EPA 524.3
DIBROMOCHLOROMETHANE 0.0019 mg/L 0.0005 EPA 524.3
CHLOROBENZENE <.0005 mg/L 0.0005 EPA 524.3
ETHYLBENZENE <.0005 mg/L 0.0005 EPA 524.3
1, 1, 1,2-TETRACHLOROETHANE <.0005 mgll 0.0005 EPA 524.3
M-XYLENE 0.0006 mg/L
XYLENE (ORTHO) <.0005 mg/L 0.0,905 EPA 524.3
P-XYLENE 0.0006 mg/L
STYRENE <.0005 mg/L 0.0005 EPA 524.3
BROMOFORM 0,0012 mg/L 0.0005 EPA 524.3
1, 1,2,2-TETRACHLOROETHANE <.0005 mg/L 0.0005 EPA 524.3
1,2.3-TRICHLOROPROPANE <.0005 mg/L 0.0005 EPA 524.3
N-PROPYLBENZENE <.0005 mg/L 0.0005 EPA 524.3
Page 1 of 2
South Central Connecticut Regional Water Authority 90 Sargent Drive, New Haven, CT 06511-596 Tel. (203) 401-2700
Connecticut Laboratory Cert. ID PH-0411 , New York Laboratory Cert. ID 11867
FINAL REPORT
Report Date: 15-AUG-2019 11 :13 AM Sample Number:
------ -200540682
PARAMETER RESULT UNITS RL METHOD COMMENTS
BROMOBENZENE <.0005 mg/L 0.0005 EPA 524.3
ORTHO-CHLOROTOLUENE <.0005 mg/L 0.0005 EPA 524.3
PARA-CHLOROTOLUENE <.0005 mg/L 0.0005 EPA 524.3
1,2,4-TRIMETHYLBENZENE <.0005 mg/L 0.0005 EPA 524.3
META-DICHLOROBENZENE <.0005 mg/L 0.0005 EPA 524.3
PARA-DICHLOROBENZENE <.0005 mg/L · 0.0005 EPA 524.3
N-BUTYLBENZENE <.0005 mg/L 0.0005 EPA 524.3
ORTHO-DICHLOROBENZENE <.0005 mg/L 0.0005 EPA 524.3
1,2,4-TRICHLOROBENZENE <.0005 mg/L 0.0005 EPA 524.3
NAPHTHALENE <.0005 mg/L 0.0005 EPA 524.3
METHYL T-BUTYL ETHER <.0020 mg/L 0.0020 EPA 524.3
DATE OF ANALYSIS REQUIRED 07/18/19 MM/DD/YY
TIME COLLECTED 1300 Hours
- - ----····--
All parameters were analyzed in accordance with EPA approved methods EXCEPT where noted in 'COMMENTS' column or in the discussion below. This report is not valid without the cover sheet.
Please note that not all the analytes listed above are NELAC certified. For identification of specific analytes maintaining this certification please contact the Laboratory Manager. Perfluorinated compounds performed by isotope dilution are nol certified and New York NEL,AC only provides certification for PFOA and PFOS by method 537. RWA does maintain certifications in other states for perfluorinated compounds encompassing the entire list found in EPA method 537 and 537.1. RL - Reporting Limits J - The reported result is an estimate. The value is less than the minimum calibration level but greater than the calculated
method detection limit (MDL)
Approved by and Date : - -----~-=--;1;-,-1,~.,._'l.,,..~iJ:,i.~,.,.--
AU6 1 5 2019
Page 2 of 2
South Central Connecticut Regional Water Authority 90 Sargent Drive, New Haven, CT 06511-596 Tel. (203) 401-2700
Connecticut Laboratory Cert. ID PH-0411, New York Laboratory Cert. ID 11867
FINAL REPORT
Report Date: 28-OCT-2019 01:12 PM Sample Number:
-----Subm #: 100180590 Type : 4520 EFF Customer: --
Study : ClWC-DURHAM CENT (Loca) : -LOGIN Attn : --
Logged : 24-0ct-2019 09:57 am ID ; ClWC- EP DURHAM FAIR WELLS Samp Addr; --
By : AKINOCHO Samp City : --
Categ. : ClWC-DURHAM CENT Collected: 10/23/19
3_ 00702 Loca Desc: LAB
200554089
10:41
PARAMETER RESULT UNITS RL METHOD COMMENTS
CHLOROMETHANE <.0005 mg/L 0.0005 EPA 524.3
VINYL CHLORIDE <.0005 mg/L 0.0005 EPA 524.3
BROMOMETHANE <.0005 mg/L 0.0005 EPA 524.3
CHLOROETHANE <.0005 mg/L 0.0005 EPA 524.3
1, 1-DICHLOROETHYLENE <,0005 mg/L 0.0005 EPA 524.3
METHYLENE CHLORIDE <.0005 mg/L 0.0005 EPA 524.3
TRANS-1,2-DICHLOROETHYLENE <.0005 mg/L 0.0005 EPA 524.3
1, 1-DICHLOROETHANE <.0005 mg/L 0.0005 EPA 524.3
2,2-DICHLOROPROPANE <.0005 mg/L 0.0005 EPA 524.3
CIS-1,2-DICHLOROETHYLENE <.0005 mg/L 0.0005 EPA 524.3
CHLOROFORM 0.0012 mg/L 0.0005 EPA 524.3
1,3,5-TRIMETHYLBENZENE <.0005 mg/L 0.0005 EPA 524.3
1, 1, 1-TRICHLOROETHANE <.0005 mg/L 0.0005 EPA 524.3
1, 1-DICHLOROPROPENE <.0005 mg/L 0.0005 EPA 524.3
CARBON TETRACHLORIDE <.0005 mg/L 0.0005 EPA 524.3
BENZENE <.0005 mg/L 0.0005 EPA 524.3
1,2-DICHLOROETHANE <.0005 mg/L 0.0005 EPA 524.3
TRICHLOROETHYLENE <.0005 mg/L 0.0005 EPA 524.3
1,2-DICHLOROPROPANE <.0005 mg/L 0.0005 EPA 524.3
BROMODICHLOROMETHANE 0.0018 mg/L 0.0005 EPA 524.3
DIBROMOMETHANE <,0005 mg/L 0.0005 EPA 524.3
CIS-1 ,3-DICHLOROPROPYLENE <.0005 mg/L 0.0005 EPA 524.3
TOLUENE <.0005 mg/L 0.0005 EPA 524.3
1, 1,2-TRICHLOROETHANE <.0005 mg/L 0.0005 EPA 524.3
1,3-DICHLOROPROPANE <.0005 mg/L 0.0005 EPA 524.3
TETRACHLOROETHYLENE <.0005 mg/L 0.0005 EPA 524.3
DIBROMOCHLOROMETHANE 0.0025 mg/L 0.0005 EPA 524.3
CHLOROBENZENE <.0005 mg/L 0.0005 EPA 524.3
ETHYLBENZENE <.0005 mg/L 0.0005 EPA 524.3
1, 1, 1,2-TETRACHLOROETHAN E <.0005 mg/L 0.0005 EPA 524.3
M-XYLENE <.0005 mg/L
XYLENE (ORTHO) <.0005 mg/L 0.0005 EPA 524.3
P-XYLENE <.0005 mg/L
STYRENE <.0005 mg/L 0.0005 EPA 524.3
BROMOFORM 0.0011 mg/L 0.0005 EPA 524.3
1, 1,2,2-TETRACHLOROETHANE <.0005 mg/L 0.0005 EPA 524.3
1,2,3-TRICHLOROPROPANE <.0005 mg/L 0.0005 EPA 524.3
N-PROPYLBENZENE <.0005 mg/L 0.0005 EPA 524.3
Page 1 of 2
South Central Connecticut Regional Water Authority 90 Sargent Drive, New Haven, CT 06511-596 Tel. (203) 401-2700
Connecticut Laboratory Cert. ID PH-0411, New York Laboratory Cert. ID 11867
FINAL REPORT
Report Date: 28-OCT-2019 01 :12 PM Sample Number: 200554089
PARAMETER RESULT UNITS RL METHOD COMMENTS
BROMOBENZENE
ORTHO-CHLOROTOLUENE
PARA-CHLOROTOLUENE
1,2,4-TRIMETHYLBENZENE
META-DICHLOROBENZENE
PARA-DICHLOROBENZENE
N-BUTYLBENZENE
ORTHO-DICHLOROBENZENE
1,2,4-TRICHLOROBENZENE
NAPHTHALENE
METHYL T-BUTYL ETHER
DATE OF ANALYSIS REQUIRED
ODOR
TIME COLLECTED
WATER TEMPERATURE
<.0005
<.0005
<.0005
<.0005
<.0005
<.0005
<.0005
<.0005
<.0005
<.0005
<.0020
10/25/19
00
1041
16
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
MM/DD/YY
CODE
Hours
Degrees C.
0.0005 EPA 524.3
0.0005 EPA 524.3
0.0005 EPA 524.3
0.0005 EPA 524.3
0.0005 EPA 524.3
0.0005 EPA 524.3
0.0005 EPA 524.3
0.0005 EPA 524.3
0.0005 EPA 524.3
0.0005 EPA 524.3
0.0020 EPA 524.3
0
All parameters were analyzed in accordance with EPA approved methods EXCEPT where noted in 'COMMENTS' column or in the discussion below. This report is not valid without the cover sheet.
Please note that not all the analytes listed above are NELAP certified. For identification of specific analytes maintaining this certification please contact the Laboratory Manager. Perfluorinated compounds performed by isotope dilution (PFC Isotope) are not certified and New York NELAP only provides certification for PFOA and PFOS by method 537. RWA does maintain certifications in other states for perfluorinated compounds encompassing the entire list found in EPA method 537 and 537.1. RL - Reporting Limits J - The reported result is an estimate. The value is less than the minimum calibration level but greater than the calculated
method detection limit (MDL)
Approved by and Date :-------- ~= .....,,_~""""'=-'-¼-~..,__.,
OCT 2 8 2019
Page 2 of 2
South Central Connecticut Regional Water Authority 90 Sargent Drive, New Haven, CT 06511-596 Tel. (203) 401-2700
Connecticut Laboratory Cert. ID PH-0411, New York Laboratory Cert. ID 11867
FINAL REPORT
Report Date: 02-DEC-2019 01 :34 PM Sample Number: 200556330
Subm # : 100181633
Study : CTWC-DURHAM CENT
Logged : 13-Nov-2019 10:37 am
By: ULMER
Categ. : CTWC-DURHAM CENT
3_00702
PARAMETER
TIME COLLECTED
FREE CHLORINE
WATER TEMPERATURE
ODOR
1,4-DIOXANE
DATE OF ANALYSIS REQUIRED
DATE OF EXTRACTION REQUIRED
Type : 4520 EFF
(Loca) : -LOGIN
ID : EP - DURHAM FAIRS WELLS
RESULT UNITS RL
0837 Hours
0.70 mg/L 0.03
13 Degrees C.
00 CODE 0
<0.07 ug/L
11/29/19 MM/DD/YY
11/27/19 MM/DD/YY
Customer : --
Attn : -
Samp Addr: -
Samp City : -
Collected : 11 /13/19
Loca Desc : LAB
METHOD
STM 4500CL G
EPA 522
08:37
COMMENTS
All parameters were analyzed in accordance with EPA approved methods EXCEPT where noted in 'COMMENTS' column or in the discussion below. This report is not valid without the cover sheet.
Please note that not all the analytes listed above are NELAP certified. For identification of specific analytes maintaining this certification please contact the Laboratory Manager. Perfluorinated compounds performed by isotope dilution (PFC Isotope) are not certified and New York NELAP only provides certification for PFOA and PFOS by method 537. RWA does maintain certifications in other states for perfluorinated compounds encompassing the entire list found in EPA method 537 and 537.1. RL - Reporting Limits J - The reported result is an estimate. The value is less than the minimum calibration level but greater than the calculated
method detection limit (MDL)
Approved by and Date : c(a(/✓~
DEC O Z 20l9
Page 1 of 1