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1 <br /> KLEINEELDER <br /> MAR 161989 <br /> March 6, 1989 EWIRONMEWAL HEALTH <br /> File: 24-I119-10 PERW ISERVICES <br /> Mr. Walt Nichols <br /> City of Stockton ' <br /> Department of Public Works, Room 317 <br /> 425 North El Dorado fZerooi z� <br /> Stockton, CA 95202 <br /> SUBJECT: Sampling Results <br /> 1321 South Sutter <br /> Stockton, California <br /> Dear Mr. Nichols: <br /> Enclosed are the analytical results for the soil samples collected from the excavation of a <br /> t160 12,000 gallon storage tank located at 134 South Sutter Street, Stockton, California, (Plate 1, <br /> Site Location Map). A sample was obtained from beneath each end of the tank and <br /> submitted for chemical analysis. <br /> Previous Activities <br /> The tank was uncovered during excavation activities associated with new construction at <br /> the site. The location of the underground storage tank is shown on Plate 2, Sample <br /> Location Map. As the original contents of the tank were unknown and a residual liquid <br /> was found in the tank, a sample of the liquid was obtained by a Kleinfelder geologist on <br /> February 10, 1989. The analytical results indicated that the liquid sample was 46 percent <br /> diesel by weight. The rest of the sample was composed primarily of water. Refer to <br /> Kleinfelder project report dated February 17, 1989, for results of the liquid sample. <br /> SamplingEvent <br /> On February 23, 1989, the tank was emptied of its contents and removed from the <br /> excavation. Backfill material and a sma:l amount of stained soil was scraped from the <br /> bottom of the excavation with a backhoe. Approximately 2 feet below each end of the tank <br /> bottom, a sample of native soil was obtained by a Kleinfelder geologist from the backhoe <br /> bucket. Soil samples were obtained by scraping away about 4 inches of the soil in the <br /> backhoe bucket with a hand trowel, then driving a clean brass tube into the native soil. <br /> Sample tubes were decontaminated prior to sampling by washing in a solution of trisodium <br /> phosphate (TSP), followed by a died led water rinse. Each tube was retracted, capped with <br /> Teflon sheeting and tightly fitting plastic end caps. Samples were labeled, logged on a <br /> chain-of-custody and stored on ice until delivery to California Analytical <br /> Laboratories/Enseco in West Sacramento, California. A representative from the San <br /> Joaquin Local Health District (SJLHD), Ms. Kaley Foley, was present throughout the <br /> sampling process. <br /> k1' cl�FFI F)FR 9795 Businevs Park: Drive. 1'ite C. Sacramento, CA 9332.7 1'916) 366-1701 <br />