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 .

berlandyr

Callout

Close Valve

berlandyr

Callout

Close Valve

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






7 C‐21 11 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




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


18 C‐21 235 Main Street Water Service Three Family 6 675

19 C‐21 236 Main Street Water Service Church 300




23 C‐21 243 Main Street Water Service Office 300









32 C‐23 175R Main Street Water Service Single Family 3 300


34 C‐23 177R Main Street Water Service Single Family 3 300



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


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


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



46 C‐29 97R Maple Avenue Water Service Single Family 3 300








54 C‐31 17 Wallingford Road Water Service Single Family 3 300







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

http://www.epa.gov/watersense

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


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


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


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


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


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


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


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



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


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


CIS-1,2-DICHLOROETHYLENE <.0005 mg/L 0.0005 EPA 524.3

CHLOROFORM 0.0012 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


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


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



FINAL REPORT

Report Date: 28-OCT-2019 01 :12 PM Sample Number: 200554089


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


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


Approved by and Date :-------- ~= .....,,_~""""'=-'-¼-~..,__.,

OCT 2 8 2019

Page 2 of 2



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


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


Approved by and Date : c(a(/✓~

DEC O Z 20l9

Page 1 of 1

technical memorandum regarding early startup

Documents