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01/09/08 16:04 $510 842 8370 CHEVRON U.S.A. 0 004/005 <br /> LJ� <br /> 1� —1 3: 1 o1"M r Kum rwt,i r i t- JFat,KIiMG V I U J so oho GJoo Y. J <br /> former dispenser locations as warranted by soil analysis results for samples collected at <br /> the respective locations. <br /> Our objectives in performing the additional scope of work are: <br /> 1. To delineate impacted-soil at the former waste oil tank site. <br /> 2. To delineate impacted soil at impacted fuel dMenser locations. <br /> '3. To stage and evaluate over-excavations spoilt for possible reuse on <br /> site or disposal. <br /> Wknngement of Excavated Soil and Umited®ver-Auvution <br /> Over-excavation limits will be determined by the extent ofhydroc arboh-saturated soil, <br /> emergency conditions,the physical limits of excavation equipment,and/or the extent to <br /> which intoe ity of adjacent structures may be compromised. Chevron's construction <br /> contractor will perform over-excavation with an excavator. <br /> During over-excavrfion activities,PACIFIC will be or,site to observe removal of <br /> impacted soil and to collect confirmation samples.Tht'PACIFIC representative.will <br /> collect soil samples in accordance with SJCEHD regtt(rements- The samples will be <br /> submitted under chain-of-custody,documentation to a California State-certified <br /> analytical laboratory for analysis as described below. <br /> Upon excavation, soil will be stockpiled on site and covered with visqueen for sampling <br /> and later disposal or reuse. Stockpiled soils will be sainpled at one four-point <br /> composite for every 100 cubic yards according to SJCDEH guidelines. if stockpiled <br /> soil is clean,the contractor may reuse it at some other location on site other than <br /> disposing it at a suitable landfill,pending approval from SJCDEH. if stockpiled soil <br /> containing petroleum hydrocarbons cannot be used as fill,it will be subsequently hauled <br /> and,disposed of at a suitable landfill. <br /> Laborntory Procedures <br /> Soil samples collected during product line removal and dispenser investigation activities <br /> will be submitted to the laboratory and analyzed for the presence of total petroleum <br /> hydrocarbons calculated as gasoline(TPH-g),benzene,toluene,ethylbsnaene,xylenes <br /> (BTEX compounds),and methyl tertiary butyl ether(MtBE)by EPA Method 8020. In <br /> addition,one selected soil sample collected from beneath the product lines will be <br /> analyzed for fuel oxygenates by EPA Method 8260 <br /> Soil samples collected during waste oil tank over-excavation activities will be analyzed <br /> for TPH-g, STEX compounds,TPH-d,MtBE.Oil and Grease(O&G)by EPA Method <br /> 5520 E&F. volatile organic compounds(VOCs)by EPA Method 8240,semi-volatile <br /> organic compounds(SVOCs)by CPA Method $270,and CAM 5 metals(cadmium, <br /> chromium,lead, nickel,and zinc)by EPA Method 6010. All analyses will be <br /> performed by a California State-certified laboratory. <br /> 2 <br />