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' TPH concentrations from four stockpile samples were 220, 430, 440, and 1,100 milligrams per '• kilogram (mg/kg) These results are presented in Appendix B - Kleinfelder Reports ' Kleinfelder proposed to aerate the stockpiled excavation soil at the Forward, Inc Class II Landfill Facility (landfarm), Stockton Kleinfelder's Soil Remediation Work Plan was submitted ' to the Regional Board and San Joaquin County The Regional Board, as the lead agency, requested that the stockpiled soil be re-sampled Soil with TPH concentrations of less than 1,000 mg/kg could be transported to the landfarm ' During October 1987, the stockpiled soil was segregated and approximately 325 cubic yards of soil with TPH concentrations of less than 1,000 mg/kg was transported to the landfarm The ' remaining 75 cubic yards was placed on new plastic sheeting and re-sampled Soil with TPH concentrations greater than 1,000 mg/kg was mixed with clean soil One composite sample made up of five discrete samples was collected from the soil stockpile remaining on site The results of this analysis was 400 mg/kg TPH Because the concentration was less than 1,000 mg/kg TPH, the remaining soil was also transported to the landfarm ' The 400 cubic yards of soil from AT&T Lodi Facility were transported to the landfarm for additional remediation and ultimate disposal The soil was not manifested because results of sampling showed concentrations of hydrocarbons were less than 1,000 mg/kg TPH The soil ' was remediated at the landfarm by aeration and discing according to Air Pollution Control District guidelines Results of soil remediation were documented by Kleinfelder in their May 01988 "Soil Remediation Report, AT&T Microwave Site, Lodi, California" (Appendix B) ' Confirmation soil samples collected from the remediated soil and submitted for analyses indicated that the soil had a concentration of less than 300 mg/kg TPH and that the soil could be used at the landfill for cover material ' Joaquin County was the lead oversight agency In a letter dated June 26, 1990, By 1990 San Joaq ty g g Y San Joaquin County requested that site investigations be re-opened, based on authority granted ' by the Regional Board's Underground Storage Tank Pilot Program The County's request was based on its concern for potential impacted soil remaining in place in a portion of the excavation, t given the TPH concentration reported from over-excavation sample SS-07 (18 feet below ground surface at a concentration of 21 mg/kg), the high site soil permeability, and shallow depth to ground water at the site ' In late October and early November 1990 FSE drilled five soil borings within and near the former excavation (Figure 3 - Worksite Plan) Three of those soil borings were converted to ' ground water monitoring wells (MW-1, MW-2 and MW-3) Soil boring B-2Y was terminated at an approximate depth of 15 feet below ground surface (bgs) due to auger refusal caused by construction debris A grab composite sample of soil cuttings, reported to contain asphalt chips, ' was collected and analyzed at the direction of a San Joaquin County Public Health Services/Environmental Health Division(PHS/EHD) representative The concentration of Total Petroleum Hydrocarbons as Diesel (TPH-D) in that sample was reported at 110 mg/Kg 1 ' F 169351861CLOSURE RPT 2 Environmental Science&Engineering Inc