Document 990jYLNQex28kVK8JpBRnXab5

AR226-2542 ^:;::?;::;x:?a:K:| YV.-.-:-y-;-'--.-f-^ WASHINGTON WORKS & EP RFI PLANNING MEETING JUNE 26, 1997 810ZOOHSV K-^^sysj ONTPERSONNE^ML^ *> Bill Majndni-DiiPont CRG-Program Manager ^ Walt Stewart-Site Sr. Environinental CoMtrol Consultant ^ Dan Weber-Site Environmental Engineer ^ Mike Lukas-^iiPont CRG-Prindpal Engineer ^ Andrew Hartten-DuPont CRGr-Senior GeoJPM 6IOZOOHSV ^ 10:00-10:10 ^ 10:10-10:40 ^ 10:40-11:10 ^ 11:10-11:20 <> 11:20-12:20 < 12:20-1:00 IntroductioB (Walt/B Review 30 Day Response (Dan) Current Conditions Summary (Dam/An Break RPI W.P. Conceptual Approacli (Mike/A Define Path Forward (AM) OZOZOOHSV ^ To review the required scope and schedule for RFI activities ROZOOHSV CUSSION TOPICS ^ List ofSWMUs to be addressed in R ^ Current conditions and VI results -> RFI workplan technical approach a schedule ZZOOOHSV 30-DAY RESPONSE ceo&ooHsv '^iT CURRENT CONDITIONS SUMMARY W)0%)HSV GEOLOGY & HYDROGEOLOGY seoeooHsv ^LOGY -> Simple stratigraphy--Ohio River Ter Deposits ^ Fine grained soils near surface and a riverbank <* Sand and gravel primary site geologi unit and aquifer *> Overlies Permian age bedrock (shale/ 9ZOZOOHSV ROGEOLOGY ':* Flow direction controlled by groundwater pumping centers >:* Pumping induces recharge--flow int from river >> East WeU Field 2000 gpm ^RanneyWeU 800-1000 gpm {* Lubeck 500-700 gpm LWiQQHSV WASHINGTON WORKS VI RESULTS KEY CONSTITUENTS DETECTED IN GROUNDWATER (by SWMU) Concentration Range (ing/I) RIVERBANK LANDFILL Freonll3 C-8 Tetraehloroethylene Chlorofoirn Axsemc Mercury .081-3.1 .052-7,1 .019-.22 .005-.006 .007-.38 .0005-.028 ANAEROBIC DIGESTION PONDS Freonll3 Methytene Chloride C-8 Barium Lead .015-4.0 .26-.29 .025.38,0 2.9-3.8 .13-.36 BURNING GROUND Carbon Tettachloride Tetrachloroethykne Triehloroethylene Freonll3 .009-.036 .011 -.025 .027-.32 .027-.039 EID911366 RFI WORKPLAN TECHNIC APPROACH 6ZOZOOHSV ''.' TECHNICAL APPROA -> Fully understand hydrogeologic system confirm gw capture) ^ Identify key data needs (hydro, & analyt -> Meet applicable EPA standard RFI requirements Refine Site Conceptual Model (SCM) QWOOHSV ^ CONCEPTUAL MOD ^ Present hypothesis to confirm or ref current understanding ^-> Supports risk-based decision makin >> Aids in identifying potential remedia alternatives *> Focuses RFI activities itonxuisv 'K-BASED DECISION KING *:< Screen VI data against Region III residential RBCs to identify applica analytical list :* Development of site-specific RBCs OZOOHSV WORKPLAN VHNICAL APPROACH ^ STEP 1-Identify initial data needs (includ workplan) -> STEP 2-Constriict grouiidwater flow mod fully define hydrogeologic system (identif additional data needs) > STEP 3-Refine site conceptual model to confirm or identify final data needs ^ STEP 4-Submit tech. memo to EPA with RFI data collection points ^ STEP 5-Field implementation ESOZOOHSV vssy WORKPLAN TABLE O INTENTS :* Introduction <:* Current Conditions (SWMUs, Geo/Hydro, SCM) -> REI Technical Approach <* Report Preparation *:* References KOZOOHSV ^KSS^^ ^MT WORKPLAN' INDICES ^ Proj. Management Plan i> Sampling & Analysis Plan ^ QAPP -> Data Management Plan 4- HASP ^ Community Relations Plan SEOZOOHSV WORKPLANPATH UPWARD *:* Subniittal date September 26,1997 9SOZOOHSV