Document dOeDLoMm3nRDwQo48ZnDEDwG

AR226-2596 OEPA/DuPont Off-site Water Sampling Re October 22. 2002 Water Sampling Topics For Today ^Ohio 2-Mile Radius Sampling Result ^Groundwater Modeling Update ^Little Hocking W.A. Investigation Re Groundwater Results/Soil Analysis Stat ^Public Water System Sampling Upda ^Status of Water Sampling Work Und WVDEP Consent Order Ohio 2-Mile Residential Sampling Results ASH019870 EID630302 Ohio 0-2 Mile Water Sampl Scope Summary ^Over 1200 homes surveyed/interview ^Over 130 residential drinking water groundwater samples collected ASH019872 EID630304 ASH019873 EID630305 ^ySX^i^ 'is^r '--^' O^w 2-Mile Sampling ^Observations: All results significantly below 150 ug/L scr level for drinking water Definite trend toward lower concentrations to 2 mile radius sampling area (vs 0 to 1 mi Highest drinking water result: 6.5 ug.L (BoardJG, close to 1 mile boun M H 0 0 tri S0 n W1 a Highest drinking water result near 2-mile boundary: 2.59 ug/L (KnottsC, west of Little Hocki 1.81 ug/L (SmithDD, north ofPorterfiel /^ -s^<>" Groundwater Modeling ^Project Objectives: Evaluate if a groundwater flow pathwa between DuPont site and Little Hocking Field under current flow/pumping cond Evaluate other possible flow/pumping conditions Pumping Rates, February 2002 (gpm) Site DuPont (exc. Gallery) GE Little Hocking Lubeck Belpre Total 68 21 4 4 7 ASH019878 EID630310 No DuPont Pumpin '\..------. it .-_n i l ; i \\ .-..../ W 00 ; ' ^ <o ' ''^w/ Little Hocking Water Association Well Field Investigation v-^:-3:-s:^^:/-.^ \Wi^- LHWA Investigation ^Objectives: Determine reason for elevated 08 concentrations in TW-4 Understand general distribution of C-8 and groundwater '^iis^' ---------" ' "^ . .. ----^ T .------"' '""' 1 , WELL (fl TV- iO ^ IV S -^ Tw-5. ^WEC-L^5 TU-3 ^ ^WELL fl. ^W-ll ^^---'"^" LHWAffW--1 Al.MBANE-1X ......... ' ' LHWW-) y WA-3 '- X UWANE-Z /< ' IV-t ^'-" '*' x y UWASW-1 "^1E-1 '' / / / LHMW-1 v Lra'w* s-i ---- ----' "^ ;< UHWHS-? . ^WEU. S3 1 I iv-i ^ --------^ \ -- '~^~\ EASEMENT----\ ^ B u - ---- ^p OF ^-...-""^ ^ ----- LEGEVD- WATER SUPPIY WFIL ^ TEST WELL- A BORING - SOIL S GROUNDWATER SAMPtES V BORtNG - GROUNDWATCR " SAMPLES SCALE 200 0 Q^O ^W^ NOTE: LCCATONS OF WEL-S AND BOR NGS ARE APPROXIMATE. 200" i------------------ Corporate Rcinediatlon Ji AilWM teriMm Suyvst mvS. UltS JHw--nd ^ Group iSwtcy unn PiBTd, Guildin 37 Wrnbigton, Delaware iaSO& SAMPLING LOCATIONS UlUB Hocking WoUr Aacio< tiafe Hocking, Ohio Jbi ^ .nSSW 4-D DO. 3MU 1 X ,,WEXL ft (1.72-3-6(5) v-1.0 d.1-.9 <0 OF 8A.Nt<.. LEGEND: WATER SUPPtY WEi-L TST WELL BORING - SOIL & GROUNDWATER SAMPLES BORING SAMPLES GROUNOWATER 0^ R^ NOTE: LOCATIONS OF WELLS ARE APPROXIMATE. NO <0.01 ug/L A\0 eORtNRS 200 Corporate Reniedtatton Am MWanuaf b4R(fWr OuPant ofut ifS IKmwuC - Group BorKy U;[i PIOTO. B^lcfi^B 37 WW-lrireylo", Dcn*f TBaOS ________ iKOUNCWATCal C--B CONCeNTflWO Uttl l-oeking . Water Asso Uttio Moc<1n9, Ohio Wafer Data Summary (in ug/ ^ Production Well C-8 Concentrations: Well 1 (1.7-3.6) Well 2 (2.0-4.3) Well 3 (.42-.9 Well 5 (5.7-8 ^ Test Wells: TW-1 (.8-2.2) TW-4 (12.3-3 TW-9 (.1-.3) TW-10 (1.1-1 ^ Probe Investigation: Shallow GW ND, 6.2,34.6, 50.8, 78 Midaq.GW Deepaq.GW 1.32 .166 (next to TW-4) Preliminary Observations ^No results higher than 150 ug/L screening ^ Production-finished water consistently aro ug/L ^ Higher C-8 concentrations in shallow grou where fme grained aquifer matrix (IJe., cla present w Steep downward trend in aquifer C-8 concentrations with depth ^ Higher concentrations observed in TW-4 anomalous compared to overall data set Bieoesaia saeeTOHsv x >^ M B1f1l in 1 ^uii);ip<" n t^I>fUa0DoOM-OO6) "-nj f, 3 > rm a C5 ^ " g, p^ ^t. 11^- ^^ |1 |sCi ! r 1 n\^-, ' 0" B3 S \ * 1 '. ' : \ \ N . . '' \ \ I \ ' \ \ ' \ i \ 1^ s- XJg u ; . S ^i^ s 1 ^ . sS ^,' p e \ -\-. \" \ \ \ \ \ \ '. \ ' \.\ \ . \\:- \ , .. \ ' ... \ i'., i s \ ' " ! M"8. ^i g ----^L^x1 a, S>Bi-Qin" r-.Q ^\ J/'LlA,/'-- tj 02" 1 \ 1 T 11[Ij1 so y -n T/vx r 1 11 i^n il E't VI n ^^ !< 0 \%'-.A-^ % V- is0 ""' - t i s" C\" X T f" i T "i ^ 'z' 1 3/C'r- ^ i^' -- '?--'" -*-'''^ \-1 ^J \ . \ i ^^ ^ M \^ s s \ \1 X / / /' '";" \ '^ y ^ ^^ i I \ \ V--1 i i '? ^ i ' !- 7 !'-ii---------- r i 3 n 1/1 Is -s I- ^ ^ < s a \ \ ^\ ^''^ i ^? |+? ^a ^ < b S'g ? j " z5 Ss t ' d p P ^ "3 0z ^ \ , :. - \ j J ! on ^ I " !' 1 ', , \ ' % '-s<- ^''k ASH019BB7 EID630319 ^ A SCKCEKBO ttdfW/A. Of TEST WELL OR WOOUtTlOlt 1EU. CMWNO WtTEIt UMPUE ti>C*'10 IM CEOMIOBE OR SOTOSCMC BCSINC; trm WU y-.... HE C~B COMCatWHTlO'l (>>aA) caouw<]rA-rEB EIEVTON S0_ SAMPLE. LOCJH OH MoriMrW ScolB; 1" 60" Verllcol Scote: 1" - 10" CiWoratB, Rwat)iition - ..^-'-".;';.'. ''.~TM' ASH019889 EID630321 ASH019890 EID630322 Ohio River Public Wate Systems ASH019892 EID630324 ^' Ohio River PWS Summary (in ug f +5 ' +3 '0 ^ -3 ^ -18 w -30 w -40 ' -42 -45 w -48 w -50 Parkersburg Bel Pre LHWA Lubbeck Tuppers PL Ravenswood Mason Cty Letart LF Racine L&D Vm.of Racine Vill of Syracuse ND .1-.3 .8-8.2 .2-1.0 .2-.7 ND NQ-.l .518 ND ND-.41 Surface Water Summary (mu ^ Transect 1 ^ Transect 2 ^ Transect 3 ^ Transect 4 ^ Transect 5 ^ Transect 6 ^ Transect 7 ^ Transect 8 ^ Trasnect 9 ^ Transect 10 ^ Transect 11/12 -18 -42(Letart) ND (2 samp) ND (2 samp) ND (2 samp) ND (9 samp) ND (10 samp) ND (9 samp) .09-.13 (2 sam .9-1.1 (2 sam .29 (2 samp) .23 (2 samp) .1 (4 samp) WVDEP Multi-Media Cons Order-Water Sampling Upd MMCO Water Sampling Up ^ Have completed the following: Off-sites 1 mile and 2 mile radius sampling Monthly sites sw/gw sampling (4 rounds), n Monthly sites putfall sampling PWS System sampling (now qtrly at 3 facil Ohio River sw sampling Sites plume delineation field work (28 new installed, gw/sw sampling full event just co ^ To complete: Water sampling final report Groundwater modeling final report Intentionally Blank Flow Path-lines "^sssy Little Hocking Water Association Well F LHWA-Groundwater Travel Times (in d MI H 0 Ci w 0 ha S g ^ ^ w U3 0 0