ARCHIVED REPORTS XR0009862 - Laserfiche WebLink

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Soil samples would be transported under chain of custody to a state-certified laboratory for analyses Samples should be analyzed for BTEX and TPHg using EPA methods 8020 and 8015 ' modified, respectively ' Upon approval from PHS/EHD, the open pit would be backfilled. with the clean overburden material and self compacting material in accordance with local agency requirements 7.2 Soil Remediation One 2 1 composite sample should be collected for every 200 cubic yards of the excavated hydrocarbon impacted soils for characterization If the volatile organic compounds (VOC) of the soil register less than 50 ppm, the soil may be aerated under exemption from 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 may be transported off- site, to an appropriate landfill, or aerated under permit from the APCD 7.3 Report Preparation Upon completion of field activities and receipt of laboratory analysis, a technical report ' summarizing field methods and data collected during the remediation/excavation would be prepared for submittal to the PHS/EHD 8.0 RECOMMENDED GROUNDWATER INVESTIGATION WORKPLAN ' To further define the extent of groundwater contamination, it is recommended that up to three additional groundwater monitoring wells be installed at the site One 2-inch diameter well should be installed approximately, 30 to 40 feet northwest of SBS to further define the downgradient extent of the contaminant plume, one 2-inch diameter well should be installed ' approximately 20 to 30 feet southeast of SB9 to further define the upgradient extent of the contaminant plume, and one 4-inch diameter well should be installed in the vicinity of SB7/SB3 to monitor contaminant levels in the heart of the plume and as a potential future extraction well 1500871R 053194 F'NL 10