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i <br /> y s <br /> City of Stockton Fire Station #6 <br /> Soil Remediation Plan <br /> Site Code 1013 <br /> June 24, 1992 <br /> Page 4 <br /> Confirmation Sampling <br /> Upon the removal of the contaminated soil, five confirmation soil samples will be collected, one <br /> from the excavation floor, and four from the sidewalls at appropriate depths to verify source <br /> removal. Samples will be analyzed by a State certified laboratory for benzene, toluene, <br /> ethylbenzene, xylenes (BTEX) and total petroleum hydrocarbons as diesel (TPHD) utilizing EPA <br /> Methods 8020, modified 355018015. Based upon the leaching potential analysis completed by <br /> PHS/EHD, any soils remaining in place with TPHD levels below 100 ppm.will not pose a threat <br /> to groundwater quality. it is anticipated that no soils containing greater than 100 ppm will be <br /> left in place. <br /> Backfilling <br /> Subsequent to the collection of confirmation soil samples, the excavated area will be backfilled <br /> with the.clean excavated soils (as determined from field observations), engineered sand, and/or <br /> ravel under the requirements set forth b the Cit of Stockton Public Works Department. <br /> P� g � Y Y P <br /> Soil Remediation <br /> One 2:1 composite sample will be collected from the excavated hydrocarbon impacted soils for <br /> characterization. If the volatile organic compounds (VOC) of the soil register less than 50 ppm, <br /> the soils will be relocated to the City of Stockton Corporation yard under the authorization of <br /> the PHS/EHD for use as a roadbase material at various city paving projects. <br /> Should VOC content of the soil register greater than 50 ppm, the impacted soil will be <br /> transported off site to an appropriate landfill or aerated under permit from the San Joaquin <br /> Valley Unified Air Pollution Control District, San Joaquin County Zone (APCD). <br /> SF5692.TIL <br />