DEL 302 8344536MJ. 2TWX 510-4STD CLO*

STANDARD CHLORINE OF DELAWARE, INC.GOVERNOR LEA ROAD • P.O BOX 319 • DELAWARE CITY, DELAWARE 19706

April 19, 1990

Ms. Diane WehnerEnvironmental ScientistDNREC715 Grantham LaneNew Castle, Delaware 19720

Dear Ms, Wehner:

In accordance with Paragraph 6 of the Consent Order betweenStandard Chlorine of Delaware, Inc. and the DelawareDepartment of Natural Resources and Environmental Control, weare hereby submitting the Ninth Quarterly GroundwaterMonitoring Report.

Please feel free to contact me if you have any questions.

Sincerely,

-r - - IRobert J. Touhey, P.E.Assistant Vice PresidentEnvironmental Affairs

RJT/dabEnclosure

cc: A. R. SinibaldiT. E. PlersonB. V. Bowers

0R3078I3

QUARTERLY MONITORING REPORTGROUNDWATER RECOVERY OPERATIONS

STANDARD CHLORINE OF DELAWARE, INC.DELAWARE CITY, DELAWARE

Patrick H. DoranProject Geologist

Thomas A. Drew, P.G.Project Manager

20 April 1990

Prepared By:

Roy F. Weston, Inc.Weston Way

West Chester, Pennsylvania 19380

AR3078U

QUARTERLY MONITORING REPORTGROUNDWATER RECOVERY OPERATIONS

STANDARD CHLORINE OF DELAWARE, INC.DELAWARE CITY, DELAWARE

In accordance with the 22 January, 1988 consent order betweenthe Delaware Department of Natural Resources and EnvironmentalControl (DNREC) and Standard Chlorine of Delaware, Inc., thisquarterly report has been prepared to document the activitiesassociated with the contaminant recovery program at thereferenced site. This report presents the monthly withdrawalrates, and contaminant recovery at the pumping wells, as wellas quarterly sampling analytical results and water elevationdata for the recovery and monitor wells, for the first Quarter1990. The report also contains an evaluation of theeffectiveness of the recovery system and appropriaterecommendations. Documentation presented in this report;covers the quarterly period from January through March, 1990.

Evaluation of the Recovery System

The average monthly withdrawal rates from recovery wells RW-1 through RW-4 for the quarterly period January through March1990 ar© presented in Table 1. The withdrawal rates indicatedfor each well represent the average withdrawal rate for thedays when the well is actually pumping. The number of daysduring the monthly period when the well is not pumping is alsoindicated in Table 1.

Recovery well RW-1 pumped almost continuously during thisquarterly period, except for brief periods for scheduledmaintenance. On 23 March 1990, RW-1 was shut down forredevelopment and testing. During the redevelopment work onRW-1, it was determined that a hole had formed in the wellscreen allowing filter pack material to enter the well. Thiswell will be relined with a 10-foot long section of 6-inchdiameter, 0.02-inch slot "Monel" well screen attached to anappropriate length of 6-inch diameter carbon steel pipe. Therelining work*is scheduled to start on 16 April 1990.

Recovery well RW-2 pumped only intermittently during themonths of January and February, 1990. Redevelopment and acidtreatment was performed during the period between 26 Februaryand 12 March 1990. During the redevelopment, it was

-1-

flR3078'l5

determined that a hole had formed in the sump, below the wellscreen, allowing filter pack material to enter the well. A"hydro-ester" plug was installed to seal the hole. Followingthe completion of well rehabilitation and the repair work, a25-gpm pump was installed and pumping was started on 12 March1990. The average withdrawal rate increased to approximately8.8 gpm for the remainder of March, 1990.

Recovery well RW-3 pumped almost continuously during thisquarter, except for a short period of down time in March forredevelopment and acid treatment and other short periods ofscheduled maintenance. Average pumping rates increased fromapproximately 6.4 gpm to approximately 13.7 gpm afterredevelopment of the well.

Due to electrical problems, recovery well RW-4 did not pumpfor a period of 12 days during the month of January. RW-4pumped continuously during the month of February .3Redevelopment and acid treatment was performed on RW-4 during:March. During the development, it was determined that a hole;had developed near the top of the sump, below the well screen,allowing filter pack material to enter the well. As in RW-2,a "hydro-ester" plug was installed to seal the hole.Following completion of the development work, the averagewithdrawal rate had increased from approximately 8.4 gpm toapproximately 19.9 gpm.

Depth to water measurements obtained from the recovery andmonitoring wells on 19 and 20 March 1990 were used togenerate the water level contour map presented in Figure 1.This map represents water levels observed while recovery wellsRW-1, RW-2 and RW-3 were pumping. A summary table of thesewater elevation data is presented in Table 2.

Monthly concentrations of organics recovered at RW-1, RW-2,RW-3 and RW-4 are presented in Table 3. Table 4 presents thetotal tgsnzene species concentrations for the 14 March 1990sampling event which included monitoring and recovery wells.An isoconcentration map prepared using the data from Table 4is presented in Figure 2. Table 5 presents the results forindividual benzene species analysis at the recovery andmonitoring wells for. samples collected on 14 March 1990.Comparison of the isoconcentration map presented in the fourthquarter 1989 report to the first quarter 1990 indicatessimilar conditions existing for both periods.

-2-

flR3078i6

Summaries of monthly and cumulative groundwater withdrawalsand contaminant recovery for each of the recovery wells RW-1,RW-2, RW-3 and RW-4 are presented in Tables 6, 7, 8 and 9respectively. Monthly and cumulative results for the entiresystem are presented in Table 10. The data indicate that thetotal benzene species recovered during the first quarter of1990 has increased compared to contaminant recoveries recordedin the fourth quarter 1989. The increase can be attributedin part to higher pumping rates in all the wells followingredevelopment work.

Installation of Recovery Well RW-5

The installation of recovery well RW-5 was completed duringthe period between 28 February and 13 March 1990 under thedirection of an on-site WESTON geologist. The location of RW-5 is shown on Figure 1.

Drilling of the recovery well RW-5 was performed using cable-tool drilling techniques. A 16-inch temporary steel casingwas installed to a total depth of approximately 57 feet belowground surface (BGS). A dark, grey micaceous, clayey silt(Merchantville Formation) was encountered at approximately 54feet BGS. The recovery well RW-5 was constructed inside the16-inch temporary casing, following the removal of the drillcuttings. A 3-foot long section of 8-inch diameter schedule80 carbon steel casing (sump) was welded to the bottom of a10-foot long section of 8-inch diameter, continuous wound,0.02-inch slot stainless steel well screen. The bottom of thewell screen was placed at approximately 54 feet BGS. The 3-inch diameter schedule 80 steel casing extends from the topof the well screen to approximately 1.5 feet above groundsurface. Centralizers were attached to the well on the sumpand on the steel casing approximately 10 feet BGS to insurethe uniform placement of the sand filter pack around the wellscreen. Also, in order to monitor water levels in the pumpingwell, af 2-inch diameter observation well was placed in theannular space between the 16-inch temporary casing and therecovery well. The 2-inch diameter observation well consistsof a 10-foot long section of 2-inch diameter, 0.02-inch slot,stainless steel well screen. The bottom of the 2-inch screenis set at approximately 54 feet BGS. 2-inch diameter steelcasing was welded to the top of the 2-inch well screen andextends to approximately 1.5 feet above ground surface.

-3-

AR3078I7

A sand filter pack was placed from the bottom of the sump toapproximately 34 feet BGS (10 feet above the top of thescreen). A bentonite pellet seal was installed on top of thefilter pack to 31 feet BGS. A cement grout was then placedfrom 31 feet BGS to ground surface. The 16-inch temporarycasing was then removed from the ground except for a 10-footlength which remained from ground surface to 10 feet BGS.Following completion of the well construction, the recoverywas developed using mechanical surging and airlift techniques.A well construction diagram for RW-5 is shown in Figure 3.Purge water was directed to the on-site treatment system forprocessing.

On 27 March 1990, WESTON performed a step drawdown pumpingtest on recovery well RW-5. The purpose of the step test wasto determine the specific capacity of the well. This

I . information could then be used to determine an optimum pumping' 'rate for the recovery well and the appropriate size of pumpL'

.- jtb be installed at RW-5. Depth to water measurements were./obtained prior to the start of the test in the recovery well/ and surrounding monitor wells, and throughout the duration of

the test. Discharge water was directed to the on-sitetreatment system.

Figure 4 is a graph showing the depth to water measurementstaken in the pumping well during the test performed on 27March 1990. Figure 5 is a graph showing the projected(estimated) drawdown at increasing pumping rates, based on thedata collected from the 27 March JL99Q test. T$f specificcapacity of the well at the end of he step// test wasdetermined to be approximately, 1.7 gpm/ft.

Based on the results of the step-idfawdown jumping test, apumping rate of between 20-25 gpm will yield a drawdown ofapproximately 15 feet. This would place the pumping waterlevel approximately 5 feet above the bottom of the wellscreen.:; <- •"£-"->.Based on the results of the redevelopment of the existingrecovery wells, it was decided that the specific capacity ofRW-5 may be enhanced by acid treatment prior to theinstallation of the recovery pump. The acid treatment of RW-5 was performed during the week of 2 April 1990. A step-drawdown pumping test was performed following the acidtreatment in order to determine if the specific capacity ofthe recovery well was enhanced by the acid treatment. Figure

-4-

AR3078I8

6 and Figure 7 present the results of the step test performedon 7 April 1990. Review of these results indicate that thespecific capacity of the well was not significantly increasedfay the acid treatment.

Recoimendations

1. A pumping system (i.e. pump, piping, flow meter, and allother necessary equipment) should be installed at the newrecovery well RW-5 so that this new well can be broughtinto service*

2. Recovery well RW-1 should be relined. Followingcompletion of the well relining, an assessment of thespecific capacity of the well .should be performed inorder to determine an optimal pumping rate for the well.

3. An assessment of the specific capacities in recoverywells RW-2, RW-3 and RW-4 should be performed in orderto determine optimal pumping rates for these recoverywells.

4. A meeting is planned with WESTON and SCO personnel todiscuss possible enhancements/modifications to theexisting contaminant recovery syst<

-5-

4R3078I9

""—— Standard Chlorine Boundary Un.TW-10 Monitoring Well

RGURE 1 WATER LEVEL CONTOUR MAP19MARCH1990 4R307820

-- —— - Standard Chlorine Boundary Line• TVMO Monitoring Well§)RW-1 Recovery Well—50— Concentration of

Total Benzene Species (ppm)TW- 5 TW-28.30 Have Fre« Organics

STANDAUD CHLORINE Or nr. .u,>B. |N

FIGURE 2 ISOCONCENTRATION MAP OF TOTAL BENZENE SPECIES,14 MARCH 1990 3 ft 30 78 2 |

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Schedule 80Steel Sump

FIGURE 3 RECOVERY WELL RW-5WELL CONSTRUCTION SCHEMATIC

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AR307823

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AR307825

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TABLE 1

AVERAGE MONTHLY WITHDRAWL RATES (GPM)GROUNDWATER RECOVERY WELL SYSTEM

STANDARD CHLORINE OF DELAWARE, INC.

MONTH (1990) RW-1 RW-2 RW-3 RW-4

January 21.8 2.6 .7.0 6.0PD » 21 days PD « 1 day PD = 12 days

February 41.3 0.7 6.4 8.4PD — 23 days

March 40.0 8.8 13.7 19.9PD - 8 days PD » 11 days PD = 5 days PD =• 8 days

PD - pump down

flR307827

TABLE 2

GROUNDWATER LEVEL DATASTANDARD CHLORINE OF DELAWARE, INC.

19, 20 MARCH 1990

Measuring Point Depth to GroundwaterElevation Water Elevation

Location (Ft. MSL) (Ft.) (Ft. MSL)

TW-1 49.90 30.08 19.82TW-2 56.10' 39.92 16.18TW-3 56.30 40.25 16.05TW-4 55.00 40.33 14.67TW-5 50.10 33.92 16.18TW-6 , 50.70 35.08 15.62TW-7 50.40 35.17 15.23TW-8 52.20 37.75 14.45TW-10 50.50 38.00 12.50TW-22 ** 40.16 **TW-24 49.44 38.92 10.52TW-25 49.44 36.17 13.27TW-28 52.82 42.42 10.40TW-30 52.29 40.17 12.12TW-31 50.36 36.92 13.44TW-49 55.71 49.08 6.63TW-50 53.28 47.33 5.95TW-60 46.44 37.83 8.61TW-61 45.50 38.00 7.50TW-62 48.92 42.08 6.84TW-63 53.83 47.25 6.58TW-64 53.48 44.08 9.40RW-1 54.75 55.00 -0.25RW-2 52.99 64.75 -11.75RW-3 45.55 47.75 -2.20RW-4 48.08 * *

* unable to take measurements, well temporarily inaccessible.

** Additional riser pipe added to well, elevation undetermined.

Ar?307828

TABLE 3

MONTHLY CONCENTRATIONS OF TOTAL BENZENE SPECIES (mg/L)GROUNDWATER RECOVERY WELLS

STANDARD CHLORINE OF DELAWARE, INC.

MONTH (1990) RW-1 RW-2 RW-3 RW-4

January 76.11 248.31 97.87 63.50

February 76.96 251.23 107.68 46.47

March 91.27 279.94 114.77 57.54

AR307829

TABLE 4

QUARTERLY SAMPLING RESULTSMONITOR AND RECOVERY WELLS

STANDARD CHLORINE OF DELAWARE, INC.

14 MARCH 1990

: Total BenzeneSpecies Concentrations

Location ________(mcy/1)____

TW-1 6.19TW-2 0.37TW-3 0.52TW-4 0.92TW-5 *TW-6 179,80**TW-6A 27.70TW-7 21.76TW-8 127.55TW-10 161.86TW-22 2.27TW-24 105.84TW-25 105.04TW-28 *TW-30 *TW-31 245.10TW-49 285.71TW-50 278.04RW-1 83.49RW-2 279.94RW-3 100.55RW-4 57.54**

* Free organics in well

** Sample Results in from 28 February 1990 - Sample NotCollected on 14 March 1990

AR307830

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