Document dn894r1d61YjbQk4GKew87839

AR226-2544 UNITED STATES ENVIRONMENTAL PROTECTION A6ENCY REGION II! 841 Chestnut Building Phlteitelphia, Pennsylvania 19107-4431 0x11 RMHVCB ilT.oTery ENVIRONMENTAL omci tn Reply Refer TOt 3WC23 C5RTTFIBO MftTT. HS-TORN BECBIPT BBOtffiSTBP JAN I 5 "898 Robert L. aitchey ' Senior Environmental Coatrol Consultant ' 3.1. dupont da Nemourg 6 Coir^iany Washington Woylts P.O. Box l21? Parkeraburg, We Virgiaia 26102-1317 Res RCBA Paeility Investigation Work Plan. Noeiee of Oefieieaey Washington, Weat Virginia Facility Facility BS?A ID ft: WVD 043 875 291. Dear Mr. Sitehayt On Septembear 24, 1937 E.I. duronfc de itemowfl 6 Conipany, rne. subreifceed the RCRA FaqI^^Y tnTOatigaftiatt 9l^a (HFI) for their Washington, Wast Virginia facility. Tb-s-a docuinent was xwivned to dafCTiinB i< Ch plan fulfilled the condisiona of the RCHA correetiv Aetiea PerBit liuinbaf wvo 045 87S 291. The attached Eeporfe auniiiiarizea eeneluaions Baaehad during the review. DuPont shall modify Uie RFI Woifte plan to overcome the deficiencies noted in the review and reply to ESA within forty-five (4S) calendar days of receipt ot this leteer. If you have any questions on this mateer please contact m at (215) ^66- 3431. . Attachments ess C.s. wokpara, W BBf ^Jh_^ Dsnia M. Zielinski RCRA Operations Branch EID911334 g.l, V3t9ff0iaSaSXHBGSTONHT,OMonBMST fVt ZclolOMlpajXunXc, arc, g? 10 NVO 045 875 291 RCRA ?ACIUCT IHVBa?ISATIO NOiat fUm SSNBRAI. COMTOan-3 if 1. as described on page 2 of the work plan, the f irate purpose of the RI is to isoUeefe data of sufficient quality and. quantity that characterizes the nature and extent ot contamination from release sources and to determine tha rate of migration ineo groundwater, soil or other media, applicable. In order to aceomplish this purpose the following investigations should be performed as an input of the groundwatel? (low modal and the site conceptual modal; ,, ^ /.Ffi/.itAt" OroCeS^ A. Monitoring Data Evaluation B. Slope Stability Investigation lt"ai.*A<nlm-'"B^ l^T. c. Leaehase and Perched Water Investigation, and D. Procaaa Lines and Haste stream Haw Investigation 2. Epft. has a different interpretation of ens groundwater then OWoat. It i^ItLn+1 r"in'"l'f*t- q ---'T,, -loTcOal""lanEhdafeiltlheaidaelluteviaehl egOrohuiondRwiavteerr flaw side afc as the site runs from a discharge aaaa. the '^AioiKfcs wi&' therefore, a Monitoring Data Evaluation must take place. The elay layer aa-fihaL^hio River bank acts as a lining ot the river water to farm a Jbarriagjbetweea the river and the inland sida. Sinee the production . ^r well? 'were installad, che groundwatar level wag locally altered, ""/ >r aecocding to the pumping operations, so toe groundwater flow model l^teje^/ should inelud the local landtill area, the bedrock aquifer (Attachment It L 'L A,.? A) and the psrehed wacer thereby eonaidering the site aa a whole. ia " -- important that tha input data is accurate, because tha simulatioo can't Act- be mere accurate then the data available rli ifJt I Kieisting data should be evaluated before for ths input. calculations. All For exaBpla, tha c'" w jgroundwatar levala were observed W.OS and 581.98 respectively in '1s LftA ^^-RBLMW-4 and Tw-l of the 1991 sampling prograa. Hk.Lr'''^ phenomenon of wacks which occurred on the clay It indicated layae o the B piping river bank <i i i-,. "0 T"tS whieh saeped chs river water into the RSL area, and not a recharge from/" -- the Ohio Biver. Attachment B gives sonr suggestions Cor evaluating tha^ ^ " nionitoring data along the rivar aida due ta groundwater changea. 6ijffi'^ .yll e -^ i-.i, * -*." V^^' 3. Mo Nc -tU-cl^/c, i , 'vu.t. IA ^,i|\pf4- " ^1.5 l As daacribed OB page 12 of the work Plaa, some slumping of eha elay and 3ilt exists along the River's edge, therafoire a slope stabilization investigation must take place. The stability ot tha river bank slope could, be undergoing deformation. lit the slope fails, it will not only damage the barrier as?ea, but could also damage the plane- A through investigation including the (allowing is suggested.: ^My , Ca-4 WorK " ^ A l a a ' '" j^ C M k-luJi- ytfifiV, . -- -Fifcid ^Qr"' w> ' Visual .inspection of Cha scrap area surface failureA and esaaion above tha river water level should be conducted. The evidence is often hidden by vegetation. Careful invatigacioB should be conducted at eha Rannay well and other pumping areas because lowering of the gtBundwateer cable can lead to land movement. evaluation of ehe ultimate dynamic factors, such aa axtreBaly heavy preeipieation, 100*year frequency flood and sudden drawdowns, ea eBtiniaee ehe future riska aheuld be conducted. 4. A leaehate and perched water investigation should also be conducted. > w According to your July 11, 1997 response letter, DuPont has installed, and began operating on April 25, 1991, an activated carbon treatment g ^..c.^- ^ s ^Al<t ^ ^C^k [^ ^ ^\\^st EID911335 ^ ^ 1 S^t ^ce -2- 1^4- ct ?I/MM(^ C^^ ^-^ rf- ^e. ?ns^ /, , , /? tt+. i , ^V "rtu$ ls system w capture the water leaking la the <.uKp,,,o^Y^B?Bgoeeg3iag area. ,, ( i <iilf(o*n 1nf"fl"O^otfd Through seepage the second quarter of have been processed. 1&97, It is approximately 2.8 million gallons unclear whether or not RBI&-1 is at |y)Pn.".'i^i U HA ^J<?ri<(to*- still aeeping or not, please confirm. The Work Plan should include the l /, ' measurement of elevation and quantity of BBU.1, RBtA-2 (Attachments C l*^'$ ' and B) and other seepa found. Also, the pewhed eontamtnated water should be iovesttigated for the extent and souree control. 5. r $oi(tti CI'I'&Tl-'t, 6. The Verification investigation laboracoify result? detected 'SS and PCS do , ^n t:he srouadwateK samples, but not in the soils. (See Xttachnienta E an^ F) whare is the source ta) o the oontaTOinattiCTi.? A& inveatigatioB on the process lines and waaca stream lines should.be .conducted. This investigation must be performed prior to conducting the modeling. fp^ OlA-r *>'.Wfe?- sws^ li^S cwd ttoo^ ,U^5 fls *(^4- s|A The following EP& publications, which are included-, .should be eonsidereil in the sampling. BPA/540/4-91/001 Soil Sampling and Analysis tor Volatile Organic Compounds and E?A/5<0/S9S/504 Lew-Flow (Mi-ninal Drawdown) (aouod-aater Sanpling Breeedures. OlA ^<M t^clode,'? ^i, sfxexrxe COMMBHTS [)o^ 7. seetion 2.3.3 must include tba elevation of the 100-year floodplain for the Washington Borks. ^^ es. section 3.S.3 must include language that states thate any old monitoring wells designated well as the o.S. for closure muat SPA. Q^ ^ liavewior "I approval from the wv U 3^. ^pplie-afcle' Dse as ^ 3. Figue-e l should include the structure line of Lock and Dam No. 19 across the Ohio ftiver, and should also include the actual location of the site. A.J,*iJ'^ 16. figura 2 should include the seepage collection and treatment unit as "---- well aa outfall oos. v 11. 12. AAllc."' 13. 14. p^^l^ ^'W All described locations in the Work Plan, such as Shell Chemicals, Huntsman Chemicals, Anioco, FluropelymeE Manufacturing area, ets, should , . appear on a map. Q^ ,p 41^- <">? W d(SCnb< loCft+^A ' ' or v\w^t. wTcnj poiA+ia. h> ioco>4i^ . Quarterly progress reports to EPA and ehe wv Wa must be added-co the RPX Zmplwnentation Scbedula in Appendix A. Qt/ ^, Table B-2 in Appendix B o the Sampling and analysis Plan refeifeiieas SW- 845 metnod <240 tor analysis of vocs. Please note that this method is now obaolece and has been replaced by method 9260. \^,s \f.t\o^J, The Quality Assurance Projeete Plan (QAr?), Appendix C, proposes validation for l0 of the samples. and criteria for how these samples The will plan should include be selected, /^ike a rationale A 6,WkHtf 15. In addition to the procedures listed in Section 5.2 of the QAPP in Appendix c, EPA recommends a metnanol or reagent grade alcohol rinse for > equipment used for collecting organic samples. A dilute nicrie Einse w should be used for inorganic (metals) sampling equipment. Qk ' o / l6. The narrative describing trip blanks in Section 3.7.3 of the Sampling S and Analysis plan. Appendix B, is in error. The language should be w consistent with the discussions in the QAPp, Appendix C. l^ikc A oUttss . Tt/^e. l-^e - &^ ^ Ap-d^L s4w4 . EID911336