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n y Y The excavated soil was characterized and disposed at BFI Waste Systems (Vasco Road Landfill) in Livermore, California Copies of the Non-Hazardous Waste Manifests are included in Appendix C The soil was transported by MP Environmental, loading and transportation was supervised by representatives of Ned Pepper, Inc (NPI) Soil excavated from 1634 East Channel Street, and stockpiled at the site,was also transported and disposed ' at BFI at the same time 2.3 Tank Removal, July 1990 ' On July 12, 1990, a 1,000-gallon gasoline tank was removed from the site by the MARK Group This tank was located on the south-central portion of the site, near Channel Street ' (see Figure 2) Two soil samples were collected from beneath the tank, both samples showed detectable levels of total petroleum hydrocarbons The analytical results are summarized in Table 3 Soil samples locations are illustrated on Figure 3 ' TABLE 3 ' ANALYTICAL RESULTS OF SOIL SAMPLES GASOLINE UST REMOVAL 1646 East Channel Street, Stockton, California July 1990 (mg/kg) Sample TPH-G Benzene Toluene Ethyl Xylenes EDB Total ID benzene Lead f 1-East 4500 115 430 280 1870 ND 83 (9') 2-West 6100 62 170 196 1680 ND 42 (91) ND= Not deteded 3.0 SITE ASSESSMENT 3.1 Depth to Groundwater The depth to groundwater was estimated to be 65 to 70 feet below surface grade, based on maps prepared by San Joaquin County Department of Public Works, Flood Control Section (1990) This depth was confirmed during drilling in March 1993, when groundwater was first encountered at a depth of between 65 and 70 feet and subsequently stabilized at a depth of approximately 68 feet. In an earlier letter to Mr Ed Gotelli, dated December 11, 1992, the PHS/EHD reported that seasonal high groundwater depth (1986) at this site was estimated to be between 45 and 50 feet. aW&O"E A.&3.n9..,1 3