Document rBxed6y25mDgn8N6R91j01yO0

AR226-2552 -^ Washington Works EPA/COE Update Meeting July 18, 2002 Agenda Background/Receat Project Activity - RCRA Program Status - Multi-Media Consent Order Update - GW Modeling Project Review Preliminary GW Modeling Res RCRA Program Path Forward - RFI Report/EPA Review -El Status Meeting Objectives Provide brief overview of recent MMC activity at Washington Works Re-assess where we stand with regard t EPA Region HI RCRA program, determ next steps (i.e., RFI, EJ.s) Receive technical feedback from EPA/C on the newly constructed Wash Works Flow Model ^K Background/Recent Activi RCRA Program Status - EPA reviewing RFI report - C-8 screening levels needed for completio --- El evaluation also on hold pending C-8 screening levels - Ongoing GW Modeling project will addre EPA/COE 2001 comments on 1999/RFI version of GW Model Background/Recent Activi Multi-media Consent Order (WVDEP) Required Elements: - Toxicology/CAT: Develop RBC-Like screening levels for dw, soil, and air - GW/SW Investigation/GIST: Determme in groundwater & surface water at/near sit - Cap/reduce emissions to air & sw CAT Highlights Toxicology team met May 5-7. Nation recognized experts. Evaluated 20 years tox data and TERA recommendations. Final Results: - Drinking Water: 150ug/L - Soil: 240 mg/kg (ingestion) - Air: Not final, range .1-6 ug/m3 GIST Highlights Main Plant, Local, Dry Run, Letart Landfills. Have completed: -- 1-mile water use survey & sampling (all sites) - 2-mile near Main Plant/Local LF - Ohio River PWS sampling (10 miles up/50 miles down)/l-4 events per location (15 sites) - Site monthly gw/sw sampling (4 consec. months) - Ohio River Sampling - Reports (Historical, Monthly, Summary) - Site(s) Investigation, 26 weUs, ongoing - GW Model, expanded domain, ongoing ASH02-W7 EID7811S7 EID781157 MMCO-Emissions Required: Cap air emissions at year 20 levels Voluntary Efforts in Teflon: - Teflon Wastewater/Oberim Filter (90% Reduction) - Air: New scrubbers installed in April, hop achieve 85% reduction MMCO-Groundwater Modeling Project Little Hocking WA 12/2001 results provided near -term d Objective: Is groundwater transport of C-8 possible from site to LHWA well field GIST Oversight Use team of regulatory technical experts (I.e. USGS, WVB EPA, COE) throughout process Today^s Objective: - Mid-term review of progress to-date, including model conceptual model development, calibration runs, to ob early feedback and answer questions ASH027880 EID781160 BID781160