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ClaN for • Clayton discovered significant concentrations of oil and grease and gasoline in samples MN-1, ML--1, and NE-1 These samples were collctted from the north and east walls of the excavation Clayton recommended additional excavation of soil in these areas Additional samples were collected after overexcavation was completed (Figure 3) These sampies were NE-2, MN-2, ME-2, and SME-1 These samples did not show any significant contamination Laboratory results of all samples collected from trio excavation pit are presented in Appendix C 52 SEPTIC TANK REMOVAL On August 9, 1910, during the soil excavation, a septi~ underground concrete tank was encountered PHS/EHD and Mr Lewis, land owner, were informed of the • -ik's existence. Clayton obtained a septic tank closure permit from the PHS/EHD on August 10, 1990 Ms Diane Hinson o, the PHS/EHD oversaw the septic tank removal on August 17, 1990 i Prior to the septic tank removal, about 8 .riches of waste oil and about 30 inr.hes of solid sewage were rernov-d from the tank The tank was then steam cleaned The removed Haste oil and resulting ansate were sent to an oil recycling facility, Domino Kurdoon in Compton, California, accompanied by a hazardous waste manifest A copy of the manifest is included in Appendix A. Two soil samples were collected from under the former location of the removed septic tank The analytical results for these samples are presented in the next section 53 AERATED SOIL SAMPLING AND ANALYSIS The soils excavated from the pit were divided into three piles The first 2 feet of soil, which appeared to be clean, was pil-d on the east and west sides of the excavation The soil excavated from between 2 feet and 10.5 feet below ground surface (bgs) was spread out in a 1-foot layer east of the excavation The soil excavated from below the septic tank was separated from the rest of the: soil and was piled east of the excavation. Eight soil samples were: collected from the locations shown in Figure 4 Five of these samples were collected from the aerating soil, and one soil sample was ^ollected from each of the remaining piles. These samples were collected in brass cylinders and handled in accordance with the sampling instructions desenbed in Appendix C. Table 4 summarizes the laboratory results obtained from composite samples Figure 4 shows locations where samples were collected Laboratory results are included .n Appendix D 29s;144 REP