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Appendix F

APPENDIX F

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PHASE

HI-TETRACHLOROETHYLENE (PCE)

CONCENTRATIONS

IN SHALLOW

GROUNDWATER

NOVEMBER, 1990

DUPONT -

NEWPORT

NEWPORT, D

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APPENDIX G

RESIDENTIAL WELL DATA

Du PONT CHEMICALS bcc: s. caffney, BADWilmington, DE 19898 J. Karmazyn, DERS

C. Trmal, ESDN. Griffiths, LegalR. Gresh, Woodward-

Clyde

cc: K. Kalbacher, DNRECR. Sturgeon, EPA

APRIL 24, 1991Mr. Frank Eversonc/o John LaddRed Clay ConsolidatedSchool District479 Old Airport RoadNew Castle, DE 19804

Dear Mr. Everson:

Du Pont is pleased to inform you that no contamination from theNewport Superfund site has migrated to nearby residential wells.

As you are aware, a residential well water sampling program in thevicinity of Old Airport Road was conducted in 1990. This work wasundertaken as part of an investigation at the Newport Superfund Site(James Street, Newport, Delaware). The purpose of the sampling wasto determine whether contaminants found at the Newport Site hadmigrated to offsite water wells. We appreciate your cooperation ingranting access to your property to obtain the necessary samples.The enclosed tables contain sampling data collected from your welland three others in your vicinity over the nine month period betweenApril, 1990, and December, 1990.

We tested for the presence of constituents found at the NewportSite, along with certain other selected chemicals. The testsfollowed EPA's strict quality control standards. For comparison,all data are summarized and natural local groundwater quality andEPA's Maximum Concentration Level (MCL) are .listed, where available.Although these results are not a comprehensive analysis of yourgroundwater fdr all possible contaminants, even those that may occurnaturally, the water from your well compares closely with thenatural groundwater found nearby.

In no instance do the detected levels of Newport Target Constituentsexceed the amounts found in natural local groundwater. Otherparameters, such as iron, magnesium, calcium, manganese and others,are somewhat higher than the levels found in other nearby wells, butthey are unrelated to past activities at the Newport site.

SR315875

Mr. Frank EversonApril 24, 1991Page 2

Since the disposal areas were active for decades and closed in theearly 1970's, we believe it is unlikely that contaminants associatedwith the site would migrate to your well if they haven't shown up bynow.

I have recently replaced Bob DeStephano as the site manager, andwill call on you soon to personally introduce myself and answer anyquestions you may have. In the meantime, you may contact me at302-773-4237.

Very truly yours,

P. Brandt ButlerNewport Superfund site Manager

PBBrhibEnclosures ^ # 3 / 5 # 7 C

TABLE 1

1ST ROUNDRESIDENTIAL WELL SAMPLING

OLD AIRPORT ROADOU PONT-NEUPOftT SITE

COLLECTION DATE: April 20, 1990ANALYTICAL RESULTS

NON-FILTERED SAMPLES

NEWPORT SUPERFUND Natural Local Red Clay EarlSITE TARGET Groundwater Consolidated Van Den Necastro's Necastro'sPARAMETERS MCL Qualityd) School Dist. Heusel Auto Salvage(2) Auto Salvage(2)<ug/L) (ug/L) <ug/L) (R-5) (R-14) (R-4A) (R-4B)

Barium 1000 25.8 to 143 41.4 28.6 42.2 82.1Cadmiun • - . . . .Zinc * 27.3 to 659 24.7 182 116 214Trichloroethene 5 - t o 1Tetrachloroethene * . . . .

ITHER PARAMETERS(ug/L)

Aluminum * 128 to 282 - - 33.1 515Calcium * 5030 to 27600 9310 34000 28700 66900Copper * 4.4 to 28.2 - - 28.9Iron * 59.6 to 304 11600 5140 173 731Lead 50 - to 9.3 - - 4.8 41.7Magnesium . * 1580 to 9500 2520 20700 14300 32200Manganese * 29.7 to 120 36.5 2480 1520 638Potassium * 1950 to 12000 - 2360 - 4560Sodium * 7740 to 22200 7280 10700 23000 59600

Notes:

MCL - Maximum Concentration Level for final Federal Primary Drinking Water Standards.NA 3 Not Available"-" = Not Detected"*" = No MCL established ""

(1) Taken from DuPont Monitoring Wells MU-2SA, MU-28B, MU-28C, MU-34A and MU-34B, EPA confirmedbackground walls for the Newport Superfund Site.

(2) R-4A is a sample collected on May 15, 1990 from a well that serves 2 houses and an office;R-4B is a sample from an unused well located west of the houses and office.

A Woodward-Clyde Consultants Quality Assurance/Quality Control Audit has been performed on these data.

TABLE 2

2ND ROUNDRESIDENTIAL WELL SAMPLING

OLD AIRPORT ROADOU PONT-NEUPORT SITE

COLLECTION DATE: September 28, 1990ANALYTICAL RESULTS

NON-FILTERED SAMPLES

NEWPORT SUPERFUND Natural Local Red Clay EarlSITE TARGET ( Groundwater Consolidated Van Den Necastro'sPARAMETERS MCL Qualityd) School Dist. Heusel Auto Salvage(2>(ug/L) (ug/L) (ug/L) (R-5) (R-14) <R-4B>

Barium 1000 25.8 to 143 43.4 32.2 63.1Cadmium * . . .Zinc » 27.3 to 659 24.6 35.4 109Trichloroethene 5 - to 1Tetrachloroethene * . . .

OTHER PARAMETERS(ug/L)

Aluminum * 128 to 282 - - 444Calcium * 5030 to 27600 9740 35500 37400Copper * 4.4 to 28.2 13.4 38.3 58.2Iron * 59.6 to 304 11900 258 896Lead 50 - to 9.3 - - 26.8Magnesium * 1580 to 9500 2700 23100 17400Manganese * 29.7 to 120 39.2 3090 538Potassium * 1950 to 12000 - 3920 3830Sodium * 7740 to 22200 7810 12200 113000

Notes:

MCL 3 Maximum Concentration Level for final Federal Primary Drinking Water Standards.NA - Not Available"-" = Not Detected ."*" = No MCL established

(1) Taken from DuPont Monitoring WelU MU-28A, MU-288, MU-28C, MW-34A and MU-34B, EPA confirmedbackground wells for the Newport iiuperfund Site.

(2) R-4B is a sample from an unused wull located west of the houses and office.

A Woodward-Clyde Consultants Quality Assurance/Quality Control Audit has been performed on these data.

"R3I5878

TABLE 3

3RD ROUNDRESIDENTIAL WELL SAMPLING

OLD AIRPORT ROADDU PONT-NEWPORT SITE

COLLECTION DATE: December 14, 1990ANALYTICAL RESULTS

NON-FILTERED SAMPLES

NEWPORT SUPERFUND Natural Local Red Clay EarlSITE TARGET Grounduater Consolidated Van Den Necastro's Necastro'sPARAMETERS MCL Qualityd) School Dist. Heusal Auto Salvage<2) Auto Salvage<2)(ug/L) (ug/L) (ug/L) (R-5) (R-14) (R-4A) (R-4B)

Barium 1000 25.8 to 143 42.6 26.6 68.5 32.3Cadmium * - - - - .Zinc * 27.3 to 659 18.2 24.8 54.8 44.8Trichloroethene 5 - to 1Tetrachloroethene * . . . .

HER PARAMETERS(ug/L)

Calcium * 5030 to 27600 9400 32700 35300 24200Copper * 4.4 to 28.2 4.7 19.5 22.7 18.4Iron * 59.6 to 304 11400 500 105Lead 50 • to 9.3 4.4 - - 6.3Magnesium * 1580 to 9500 2730 21900 18800 11200Manganese * 29.7 to 120 34.3 2830 1140 307Potassium * 1950 to 12000 1420 ' 2820 2820 3040Sodium * 7740 to 22200 7580 12100 34500 75200Benzene 5 - - - - 6

Notes:

MCL = Maximum Concentration Level for final Federal Primary Drinking Water Standard*.NA = Not AvailableH.M s Mot Detected"*" 3 No MCL established . ,

(1) Taken from DuPont Monitoring Wells MW-2SA, MU-288, MU-28C, MU-34A and MW-348, EPA confirmedbackground wells for the Newport Superfund Site.

(2) R-4A is a sample collected from a well that serves 2 house* and an office;R-4B is a sample from an unused well located west of the house* and office.

Woodward-Clyde Consultants Quality Assurance/Quality Control Audit ha* been performed on the** data.