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WEISS AS.SOCL4TES J <br /> ATTACHNIENT B <br /> PROPOSED SOIL ANI) GROUND WATER REh1EDIATION <br /> I. SOIL RF,MEDIATIOIs <br /> High hydrocarbon. concentrations are found only in unsaturated soil immediately <br /> adjacent to the present cxcavatian, Since the affected soil can be easily accessed by <br /> excavators, the excavation and backfilling can be accomplished quickly, the total quantity <br /> of impacted soil appears to bo moderate and there is ample room available on-site for <br /> treatment of the removed soil, we I•ccl that excavation and subsequent on-site aeration of <br /> the hydrocarbon-impacted soil is the most most effective and cost-efficient remedial <br /> option for these soils. "Therefore we propose to: <br /> cs <br /> r of <br /> 1) Excavate all soil containing detectable hydrocarbons f from <br /> a all`usail n onta0ntng <br /> the excavation adjacent to the c.,ncrctc slab, <br /> identifiable hydrocarbons has been removed, collect soil s,mple col e�edsides <br /> per <br /> and floor of the final excavation. One sample u <br /> 15-ft-by-15-Ct section of exposed wall and floor of the excavation. Wewill use <br /> a portable organic vapor analyzer (OVA) and observations of by <br /> 1 bon <br /> staining and odor to determine the limits of excavation. <br /> 2} Analyze the samples for TFHC by EPA Method 8015, to confirm that remaining <br /> soil contains no hydrocarbons at concentrations above the detection limit of 1(1 <br /> parts per million (pptn). if hydrocarbons are detected in the remaining soil, <br /> continue the excavation with subsequent confirmatory resampling, until no <br /> hydrocarbons are detected. <br /> 3) Backfill the excavation with clean sand or gravel and cover the backCi!!ed <br /> excavation with impermeable asphalt or concrete. <br /> 4) Stockpile the removed soil at the rear of the Safeway facility with previously <br /> excavated material and aerate the soil according to SJLHD-Air Quality Control <br /> District guidelines <br /> Leaving the slab in place will not adversoil <br /> sely affect the-proposed-excavat�on._s�nce..... . <br /> known to contain high hydrocarbon concentrations is covered by the slab. <br /> 1 <br />