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TABLE 3 <br />Analytical Results Summary <br />Soil Stockpile Core Sampling <br />November 3, 1992 <br />Sample ID <br />TPH-G <br />(mg/Kg) <br />Benzene <br />(µg/Kg) <br />Toluene <br />(KglKg) <br />Ethylbenzene <br />(ug/Kg) <br />Xylene <br />(µgIKg) <br />S-1 <br />ND,o o <br />ND, o <br />ND, o <br />ND,, <br />ND3 0 <br />S-2 <br />75 7 <br />ND,, <br />130 <br />ND, o <br />ND,, <br />S-3 <br />ND,,, <br />ND,, <br />ND, o <br />ND, 0 <br />ND3 0 <br />S-4 <br />ND,o o <br />ND, o <br />352 <br />ND, o <br />ND3 0 <br />S-5 <br />ND io o <br />NA <br />NA <br />NA <br />NA <br />ND = Non-detectable at the level of detection noted in subsenpt <br />NA = Not analyzed <br />The analytical results indicate that the interior of the soil stockpile does not contain notable <br />hydrocarbon residues except near the location of sample S-2. TPH-G at this location was found <br />at a concentration of 75 7 mg/Kg However, the duplicate sample taken from the same location, <br />S-5, showed no detectable TPH-G, which suggests that the TPH-G is unevenly distnbuted in this <br />portion of the stockpile No benzene, ethylbenzene or xylene was detected in any of the <br />samples Toluene was detected in S-2 and S-4, however, the concentrations were low. <br />3.1.2 Geotechnical Review <br />The existing soil excavation and soil types within the excavation were evaluated by a Registered <br />Professional Engineer and a Certified Engineering Geologist The evaluation indicated that the <br />excavation can be deepened without unduly endangering the integrity of the building on the site. <br />No shoring of the walls of the pit is required and there is no likelihood of measurable offsite <br />effects from the planned additional excavation <br />3.1.3 Soil Disposal Options <br />There are several options available for the use or disposal of the additional soil to be excavated <br />from the tank removal pit and for the soil currently stockpiled on the site Soil which has been <br />analyzed and found to contain no hydrocarbon residue will be utilized for backfilling the tank <br />excavation Soil which contains less than 1,000 mg/Kg TPH-G will be transported as non- <br />hazardous material and recycled at the REMCO facility in Richmond, California Disposal at <br />a Class II landfill is also an option but is not anticipated to be used for this project Soil which <br />contains greater than 1,000 mg/Kg TPH-G will be transported under hazardous waste manifest <br />and disposed of at a Class I landfill. <br />g <br />SI7iC1RPT51AREG4QTR WP olnwo <br />