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URS <br /> Mr. Harlin Knoll <br /> San Joaquin County Environmental Health Department <br /> August 6,2002 <br /> Page 2 <br /> Sampling Procedures <br /> Confirmation Samples <br /> A backhoe bucket of native soil will be collected from each sample location and rapidly brought to the <br /> surface. Approximately three inches of soil will be rapidly scraped away from the surface, and a clean brass <br /> tube (at least three inches long) will be driven or pushed into the soil. Once the tube is filled with soil, the <br /> ends will be covered with Teflon tape and plastic end caps. Once properly sealed, the sample will be <br /> labeled, logged onto the chain-of-custody document, placed into an individual resealable plastic bag, and <br /> placed on ice in an insulated cooler, pending shipment to Sequoia Analytical Laboratories in Sacramento, <br /> California,for analysis. <br /> Stockpile Samples <br /> Samples will be collected from random locations throughout the stockpile. At each location, approximately <br /> 3 inches of soil will be scraped away from the surface of the stockpile prior to sample collection. Samples <br /> will be collected following the same procedures as the confirmation samples. <br /> Sample Analysis <br /> Samples will be analyzed within the appropriate holding times. Turn-around times for sample analysis will <br /> be determined in the field. Samples will be analyzed for the following: <br /> • Total petroleum hydrocarbons as gasoline (TPHg) by U.S. Environmental Protection Agency <br /> (EPA)method 8015M. <br /> • Benzene,toluene,ethylbenzene,and total xylenes(BTEX)by EPA method 8021. <br /> • Methyl tert-butyl ether(MTBE), tert-butyl alcohol (TBA), di-isopropyl ether(DIPE), ethyl tert- <br /> butyl ether(ETBE),and tert-amyl methyl ether(TAME)by EPA method 8260B. <br /> • Total lead by EPA method 6010B (stockpile samples,only). <br /> Report Preparation <br /> At the completion of the field activities, a UST closure report will be prepared. Included in this report will <br /> be a summary of the overexcavation activities, the results of the confirmation sampling, and a discussion of <br /> the soil stockpile disposal. <br /> If you have any questions or comments,please call me at(916)679-2299. <br /> Sincerely, C ?ED GEO� <br /> URS Corporation Americas �� �oN PAUL F�9�G'id,� <br /> s <br /> No. 7120 <br /> Vernon Elarth,R.G.7120 Exp. <br /> Project Manager �Q. <br /> s <br /> SL/hr OF CAS-����� <br /> cc: Mr.Paul Supple,Atlantic Richfield Company <br /> Mr.Marty Hartzell,RWQCB,Central Valley Region <br /> K:U5 BP ARCO\00434\UST Removal\WorkPlan.doc <br />