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Disco History for Meeting with Dot Lofstrom <br /> July 11, 2001 <br /> - Three 10,000-gallon gasoline tanks <br /> Purchased property from Parmaceast on April 1, 1976 <br /> -USTs removed in 1985 with PHS oversight <br /> - Contaminated soil aerated on site to less than allowed levels and backfilled <br /> -PHS requested additional investigation in 1991 <br /> - Soil gas survey, soil borings, monitoring wells, start of MW sampling <br /> -Most contamination between 55 and 75 feet below ground surface <br /> - An AS/SVE system using an internal combustion engine started in Feb 1995 <br /> - ICE stopped the end of 1995 and a GAC system ran off and on Dec. 95-Feb 96 <br /> - The groundwater flow direction changed October 1995 I <br /> - Where I became active at Disco <br /> - Groundwater level covered the top of the AS/SVE wells, system stopped <br /> - ITB investigation completed—plume believed to be contained <br /> - Groundwater direction changed early 1996 and no downgradient wells <br /> - Groundwater level is now 44 feet bgs and has risen 33 feet since 1991 <br /> -No MTBE has been detected and confirmed <br /> - A hydrogeologic cross sectional analysis completed <br /> -A receptor well survey completed <br /> - Workplan for additional investigations completed, revised five times <br /> - Ethylene dibromide and 1,2-Dibromoethane reported <br /> r <br /> i� <br /> iC <br /> �i <br /> i� <br /> I <br />