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. Appendix A - Historical Background Former MEL BOKIDES PETROLEUM- Linden 8203 East Highway 26, Stockton, California The site was a former gasoline station and mini-mart On 07 May 1999, three USTs, associated piping and a dispenser island were removed from the site by Semco of Modesto Six soil samples were collected beneath the USTs, two soil samples were collected beneath the dispenser area and four laboratory composited soil samples were collected from the excavated soil Approximately 150 cubic yards of soil were excavated during removal of the USTs, subsequent to the soil sampling activities, the soil was placed back into the excavation Laboratory analysis of the soil samples detected total petroleum hydrocarbons quantified as gasoline (TPH-g)at concentrations up to 17,000 milligrams per kilogram(mg/kg)beneath the northern UST (Tank9l),benzene,toluene, ethyl benzene and xylenes (BTEX)were detected at concentrations as high as 3,000,000 micrograms per kilogram (gg/kg) Methyl tertiary butyl ether (MTBE) and/or tertiary butanol (TBA) were detected in soil samples collected from the former UST excavation and stockpiled soil at the site at concentrations as high as 160,000 ug/kg MTBE The presence of high concentrations of MTBE in the soil samples indicated that an unassessed mass of MTBE remained at the site INTERIM SOIL REMEDIATION On 21 March 2000,AGE personnel excavated 195 metric tons of impacted soil from the former tank pit utilizing an excavator outfitted with a 2 45 cubic-yard bucket Following the removal of the original soil backfill material, the excavation was enlarged and deepened to an approximate depth of 22 feet bsg, and soil samples were collected from the floor(F-1) and walls (WW, EW, NW and SW)of the excavation, as well as the soil stockpiles, for laboratory analysis On 22 March 2000,the impacted soil was transported from the site and disposed at Forward Landfill TPH-g was detected in excavation soil samples F-1, WW,EW and NW at 6 0 mg/kg,23,000 mg/kg, 29 mg/kg and 32 mg/kg, respectively, TPH-g was not detected in sample SW BTEX compounds were detected in all excavation samples except SW,at maximum concentrations of 56 mg/kg benzene, 1,700 mg/kg toluene, 470 mg/kg ethylbenzene and 2,900 mg/kg xylenes in sample WW MTBE was detected in all excavation samples at concentrations ranging from 28 µg/kg (SW) to 140,000 gg/kg (WW) TAME was detected only in sample WW at 9,200 gg/kg and TBA was detected only in samples F-1 and NW at 6,100 gg/kg and 100 gg/kg, respectively Advanced GeoEnvironmental