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City of Stockton Police Facility/Site Code 1178 `--•-^ Soil Remediation Plan May 21, 1992 Page 4 Confirmation Sampling Upon the removal of the contaminated soil, five confirmation soil samples will be collected, one from the excavation floor, and four from the sidewalls at appropriate depths to verify source removal. Samples will be analyzed by a State certified laboratory for benzene, toluene, ethylbenzene, xylenes (BTEX) and total petroleum hydrocarbons as gasoline (TPHG) utilizing EPA methods 8020, modified 8015. Backfilling Subsequent to the collection of confirmation soil samples the excavated area will be backfilled with the clean excavated soils (as determined from field observations), engineered sand, and/or pea gravel under the requirements set forth by the City of Stockton Public Works Department. Soil Remediation One four container composite sample will be collected from the excavated hydrocarbon impacted soils for characterization. If the volatile organic compounds (VOC) of the soil register less than 50 ppm, the soil will be aerated under exemption of the San Joaquin Valley Unified Air Pollution Control District, San Joaquin County Zone (APCD). Should the VOC content of the soil register greater than 50 ppm, the impacted soil will be transported off the site to an appropriate landfill or aerated under permit from the APCD. .Report Preparation Upon completion of both field activities and receipt of laboratory analysis, RESNA will incorporate summarized field methods along with data collected during the remediation/excavation in the second 1992 quarterly report due in July of 1992. Field work proposed in this workplan will be performed according to the Site's Quality Assurance/Quality Control guidelines and Health and Safety Plan included in Attachments II and III, respectively. SRP51992.TJL