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EMIR, Stockton Scavenger Association Facility ' November, 1997 Page 3 ' 3 0 REMEDIATION ACTIVITIES The following sections include a summary of the sod and groundwater remediation activities at the ' subject site 31 Soil Remediation Sod remediation activities are documented in MARK's Preliminary Closure Report, June 1994 The sod in three locations within the SSA site were known or suspected to contain petroleum ' hydrocarbons at concentrations above applicable regulatory criteria These are identified as the north and south pits (former UST locations) and the former fuel dispenser island area (Figure 2) ' In January 1993, MARK conducted sod excavation at the north and south pits A total of approximately 1,400 cubic yards (in place volume) of sod was removed from the two excavations Approximately 1,000 cubic yards of soil contained petroleum hydrocarbons and was segregated for remediation The remaining 400 cubic yards of soil did not contain noticeable concentrations of petroleum hydrocarbons and was used as backfill material Remediation of approximately 1,000 cubic yards of impacted soil removed from the north and south pits was required prior to disposal MARK implemented a hybrid combination of Heat Enhanced Vapor Extraction and Thermal Oxidation augmented with bioremediation to destroy petroleum hydrocarbons in the sod After treatment and confirmation sod sampling, the stockpiled sod was hauled to B & J Landfill for disposal Analysis of the north pit sod confirmation samples indicated no detectable petroleum hydrocarbons ' in the north, south, and west side walls, and trace levels of hydrocarbons in the east side wall and floor BTEX concentrations in floor sample B1/B2 were 0 082 milligrams per kilogram (mg/kg) benzene, 0 087 mg/kg toluene, 0 008 mg/kg ethylbenzene, and 0 030 mg/kg total 'xylenes ' Hydrocarbon concentrations in east wall sample E1/E2 were 3 6 mg/kg TPHd, 3 9 mg/kg TPHg, 0 071 mg/kg toluene, 0 042 mg/kg ethylbenzene, and 0 250 mg/kg total xylenes Benzene was not detected in sample E1/E2 Soil confirmation samples collected from the south pit did not contain ' detectable petroleum hydrocarbons On July 20, 1993, MARK conducted soil excavation around the former diesel fuel dispenser island Approximately 1,133 cubic yards of petroleum hydrocarbon-containing soil was removed and ' hauled to B & J Landfill in Solano County, California Laboratory analysis of soil confirmation samples indicated no detectable hydrocarbons in the east and west side walls, and trace levels of hydrocarbons in the north and south side walls and the floor The north side wall samples ' contained a maximum of 150 mg/kg TPHd, 20 mg/kg TPHg, 0 0065 mg/kg benzene, 0 290 mg/kg ethylbenzene, and 2 6 mg/kg total xylenes The south side wall samples contained a maximum of 77 mg/kg TPHd and did not contain detectable concentrations of TPHg and BTEX The floor sample contained a maximum of 13 mg/kg TPHd, 1 5 mg/kg TPHg, 0 065 mg/kg benzene, and 0 053 mg/kg ethylbenzene 5027002 ART