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6/0$/02 TUE 12:57 FAX 916 67 100 URS Z003 <br /> _ <br /> Mr.Karlin Knoll <br /> San Joaquin County Environmental Health I)epartmnt <br /> August 6,2002 <br /> Page 2 <br /> Sampling Procedures <br /> Confwmadon 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,arad 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 coveted with Teflonm tape and plastic end caps. Once properly scaled, 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 shipnsent 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. Turnaround tirnes 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 tent-butyl ether(MTBE),tert butyl alcohol (TBA),di-isopropyl ether(RIPE),ethyl tert- <br /> butyl ether(ETBE),and tert-amyl methyl ether(TAME)by FPA 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 stockpilc disposal. <br /> If you have any questious or comments,please call me at(916)679.2299. <br /> Sincerely, <br /> URS Corporation Americas ��� �N PAUL 01 <br /> No.11201 � <br /> Vernon Elarth,R.G.7120 * Exp, 1 3! 4 <br /> Project Manager <br /> tpj'q �y�Q <br /> SL/hr OF CAS-�F� <br /> cc: Mr.Paul Supple,Atlantic Richfield Company <br /> Mr.Marty Hartzell,RWQCB,Central Valley Region <br /> 1(:115 SP ARC010043AUST Rea owAWskFUv,d- <br />