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The miracles f science' 000003 Dordrecht Works C-8 Sampling Summary Groundwater Sampling Results March 2003 Site Conceptual Model Primary source area (I.e., C8 and chlorocarbons) is freatic (shallow) i aquifer underlying FP process area. This area of impact is contained by a sheet-pile cut-off wall and a Groundwater Pump & Treat system, i Treatment is air stripper (no affect on C-8). I First aquifer is also pumped to maintain inward groundwater flow gradient. ooo Second aquifer receives "Pumped Infiltration" to establish higher pressures (upward gradient) and prevent first aquifer from flowing o vertically downward to second. Second aquifer likely flows laterally offsite. Overall in this aquifer, C8 concentrations have gone from ND in mid 1990's to 14.4 ug/L in March 2003, DMR018561 EID720706 Page`3uordreCissrp^g 2cuj ffje miracles f science' c O cO OCT n HO -J ON) O J Scope of Work Summary 24 samples were collected on March 10-12,2003, including: - 18 site monitoring wells (most previously sampled in mid 1990's). Three water bearing zones: freatic, first, and second aquifers. - 1 site tapwater (local "city" water) - 1 from "Spaarbekk" reservior - 2 from groundwater treatment system (combined influent and effluent) - 2 from site wastewater treatment plant (sweetwater and saltwater) Dard'ccr? Semcln 2033 P-i3e? Ois sn pf,!" The miracles f science Analytical Results (in ug/L) Sam ple ID I Date 1 | C-8 (ug/L) M W -315 3 /1 0 /2 0 0 3 7 1 .3 M W -N 10-2 3 /1 0 /2 0 0 3 15 M W -N 23-1 3/1 0 /2 0 0 3 5 .5 M W -N 28-1 3 /1 0 /2 0 0 3 14 .4 G W T re atm e nt 103 3 /1 1 /2 0 0 3 9 .1 8 W a s te T re atm e nt 82 3 /1 1 /2 0 0 3 3 ,8 9 0 G W T re atm e nt 401 3/1 1 /2 0 0 3 7 .9 1 W a s te T re a tm e n t 80 3/1 1 /2 0 0 3 4 ,8 5 0 Spaarbekk 3/1 1 /2 0 0 3 0.4 39 Tap Water 3 /1 1 /2 0 0 3 0 .0 7 3 6 o M W -119 3/1 1 /2 0 0 3 158 (T, M W -303 M W -05A M W -N 26-1 M W -N 25-1 3/1 1 /2 0 0 3 3/1 1/20 03 3/1 1/20 03 3/1 1 /2 0 0 3 7 ,4 3 0 6 .1 1 6 .1 3.9 9 M W -308 3/1 1/20 03 131 M W -W 02-A 3/1 1/20 03 1 4 .7 M W -314 3/1 1 /2 0 0 3 50 .2 M W -118 3/1 1 /2 0 0 3 34 .9 M W -N 17-1 3/1 1 /2 0 0 3 0 .1 3 9 M W -N 19-1 3 /1 2/20 03 0.7 62 M W -311 3 /1 2/20 03 354 M W -316 3/1 2/20 03 1530 M W -317 3 /1 2/20 03 2890 ('n'`'H '.1t-s The miracles f science -'ace 3 DMR018563 EID720708 S I 8 8 8CNCDEN MPVD I reatic La y eN rao r o erall C-8 N 900 Concent rations (|\fn>n i 2E MERWEOtHAVtN H 200 oooO o DMROl8564 EID720709 N -W O "CSw O lH t *4 te MM Mft llfMN JI-OM*-* DUPONT De NEMOURS (NCDCRIAND} B.V. m onito ring e s (a fp o ) OBSERVATION WELLS 0RINKWA1ER8CKKCM 'IX. CROTt RUC* Mi 2002- 12-20 B0 - 403970 ANNEX. te* w . Rs t UtA wA*3 b2*00002Ck*)l? 20 o o oo o oe W boo ? 6n0N UERWCDE S 1;icond Aquifr O'crall C-8 Convelli'niions (pUflE I SC UCRWCDEHAVCN i wOOOO M OH *M'J-*OO0D)l Ot H -200 MERHEDCPOIOCT 0 ___ fin SCdla OOOa OftNMMfcTERBEKKEM *0t CHOIE HOC- -& fiOO PM I ^ *VAM W W.*MO W twn MIN>uW *KWH-KlWUJ<We DUPONT DE NEMOURS (NEDERLAND) B.V. monitoring c s (a p p o ) w>*"I<-- OBSERVATION WELLS 2002-12-20 BO- *03970 *. OCI Ha* >00 CM wwt 3092 I? 20 Win ANNEX. A3 Results Discussion Elevated levels found in Waste Treatment 82-Sweetwater (3890 ug/L) and Waste Treatment 80-Saltwater (4850 ug/L). - Based on flow of approximately 500,000 gal./day, this represents discharge of approximately 7,300 lbs/year. Highest groundwater measurement 7430 ug/L in MW-303, a well completed in shallowest water bearing zone, "freatic layer" ("Ophooglaag"). Slightly higher than Aug. 1995 measurement of 1700 ug/L. Other shallow wells near this site location MW-316 (1530 ug/L) and MW-317 (2890 ug/L). Range for shallow water bearing zone is 34.9 ug/L (central site) to 7430 ug/L, north site, near river. 000010 n HO 3too 5oH<x> Mto 00I, ODrdtecht Samping 2003 P-n? 7 i'ii! ! n n n i'i The miracles f science- I O O O OU H- noh -tOoj MoH5o UH> OOli a Results Discussion Concentrations in first aquifer "Eerste" range from .139 to 16.1 ug/L. Concentrations in second aquifer "Tweede" range from .762 to 14.4 ug/L. Overall, 2003 measured concentrations are higher than mid 90's sampling events. Spaarbekk Reservior .439 ug/L. Water used by site for non-contact cooling. Also used for water sports/recreation. Groundwater treatment system influent, GW Treatment 103 was 9.18 ug/L and effluent, GW Treatment 401, was 7.91 ug/L. Site "Tap Water" was .0736 ug/L. Source is "city water". Uorcrecht bompmg The miracles f science' Site Conceptual Model Summary Areas of impact and groundwater flow directions 000012 w Ha- j K> O sj Ocrdrenti! Ramplrr. ?0")3 H 3age 9 yp The miracles -/science* OOOO III.HI , I 5M gH o foO oM HJ U00l Ul O4 03/ 10/2003 <u U c: S y 00004 DMR018571 EID720716