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January 13, 2003 <br />L � �� <br />G v _MD <br />Mr. Dennis Catanyag <br />San Joaquin County Environmental Health Department JAN 2 1 2003 <br />304 East Webber Avenue, Third Floor <br />Stockton, California 95202 ENVIRONMENT HEALTH <br />PERMIT/SERVICES <br />Re: Product Line Soil Sampling Report <br />ARCO Service Station No. 2093 <br />3425 Tracy Boulevard <br />Tracy, California <br />URS Project No. 38466066.00003 <br />Dear Mr. Catanyag: <br />URS Corporation Americas (URS) has prepared this report on behalf of Atlantic Richfield <br />Company (ARCO) to document soil sampling conducted during the removal and replacement of <br />product lines and dispensers at ARCO Sevice Station No. 2093 located at 3425 Tracy Boulevard, <br />Tracy, California (site) (Figures 1 and 2). <br />Site Background <br />Currently, the site is operated as an ARCO gasoline service station; an air sparging system is <br />operating, and quarterly groundwater monitoring is being conducted at this site. The majority of <br />the property is paved. <br />The removed product piping was transported to Norcal Waste Systems Pacheco Pass Landfill in <br />Gilroy, California, for proper disposal. Sampling activities were observed and approved by <br />Mr. Dennis Catanyag of the San Joaquin County Environmental Health Department (SJCEHD). <br />Soil Sampling and Analysis <br />On December 18, 2002, eight soil samples (designated DI -1 through DI -8) were collected beneath <br />the dispenser stands, and six soil samples (designated LS -1 through LS -6) were collected beneath <br />the product line trenches. Soil samples were collected at depths ranging from 3.5 to 7 feet below <br />ground surface (bgs) at the locations shown on Figure 2. Soil samples were collected by pushing <br />six-inch brass liners into a backhoe bucket of excavated soil. Soil was field screened for the <br />presence of volatile organic compounds with a photoionization detector (PID) at all sample <br />loctions. The maximum PID reading of 80 parts per million (ppm) was recorded at DI -6. Stained <br />soil was observed in dispenser island samples DI -1 through DI -6. Field and laboratory procedures <br />are presented as Attachment A. <br />Soil samples were analyzed for purgeable hydrocarbons by U.S. Environmental Protection Agency <br />(EPA) Method 8015M; benzene, toluene, ethylbenzene, and total xylenes (BTEX) by EPA Method <br />8021; methyl tert-butyl ether (MTBE), tert-butyl alcohol (TBA), di -isopropyl ether (DIPE), ethyl <br />tert-butyl ether (ETBE), and tert-amyl methyl ether (TAME) by EPA Method 8260B; and total <br />lead by EPA Method 6010B. Samples were submitted to Sequioa Analytical Laboratory in <br />Morgan Hill, California (Sequioa) for analysis. <br />URS Corporation <br />Crown Corporate Center <br />2870 Gateway Oaks Drive, Suite 300 <br />Sacramento, CA 95833 <br />Tel: 916.679.2000 KA15 BP ARCO\02093\Line Upgrade\1_011002.doc <br />Fax: 916.679.2900 <br />