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I <br /> Pei I 1 <br /> TANK CLOSURE RWQRT' <br /> 2320 North Et Dorado Street, <br /> Stockton, Catifornis <br /> Aegis Project No. 89-049 <br /> Page 11 <br /> 3.2.2 Petroleum Hydrocarbons in Ezcavated Soil <br /> A total of approximately 650 cubic yards of soil was excavated from <br /> the former tank basin and the new tank pit. This soil was temporarily <br /> stockpiled on site pending analytical results of composite samples. <br /> Soil excavated from the new tank pit was isolated from other soil <br /> containingdetectable le levels of hydrocarbons. Based on analytical <br /> results of soil samples, SJCEHD authorized the backfilling of the <br /> former tanklbasin with soil from the new tank pit. The former tank <br /> basin was backfilled, compacted and <br /> P paved. Approxima'-sly 20 to 30 <br /> - cubic yardsiwere removed from portions of the product line trenches. <br /> Four discrete samples were collected for every 50 cubic yards of <br /> stockpiled soil and combined into single composite samples in the <br /> laboratory. <br /> Composite samples were analyzed for TPH as gasoline, as well as <br /> benzene, toluene, ethyl benzene, and xylenes (BTEX) , ethylene <br /> r*w dibromide (EDB) and total lead. The results of the analyses are <br /> summarized in Table 3. Although petroleum hydrocarbons were detected <br /> in initial soil samples, sa1r-".>s from soil stockpiles revealed non- <br /> detectable levels of targeted compounds. Total lead results for all <br /> composite samples were below 10.0 ppm. The laboratory reports and <br /> chain-of-custody forms are included in Appendix A. The material was <br /> removed by a licensed hauler after approval was received from WCCSL <br /> " and the SJCEHD. <br /> TABLE 3 <br /> STOCKPILE SOIL SAMPLE ANALYTICAL RESULTS <br /> Results reported in Parts Per Million (PPM) <br /> a <br /> - Sample ID TPH(G) EDB Benzene Toluene Ethyl Benzene Xylenes <br /> Comp Soil ND ND ND ND ND ND <br /> Pile <br /> SP-(A-E) ND ND ND ND ND ND <br /> SP-(F-I) ND ND ND ND ND ND <br /> ND = not detected <br /> SP-(A-I) = Stockpile Material From Former Tank Basin After Over- <br /> Excavation <br /> Comp Soil Pile = Stockpile Material Generated During Tank Excavation <br /> TPH = total petroleum hydrocarbons, G = gasoline <br /> EDB = ethyl dibromide <br /> BTEX = benzene, toluene, ethyl benzene, total xylenes <br /> Note: Samples were composited in the laboratory. <br /> Detection Limits: TPH = 1.0 ppm, BTEX = 0.005 ppm, EDB = 1. 0 ppb <br /> I <br />