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k" KLEINFELDER November 7, 1988 File 24-111.9-00 Mr. Dan Clement City of Stockton Department of Public Works, Room 317 - 425 North El Dorado Stockton, CA 95202 SUBJECT: Soil Sampling Results 134 S. Sutter Street Stockton, California Dear Mr. Clement: Enclosed are the analytical results for the soil sample collected from under an excavated tank at 134 S. Sutter Street, Stockton, California (see Plate .1, Site Location Map). The sample was collected and submitted for laboratory analyses to assess the possible presence of petroleum hydrocarbon contamination in the soil beneath the tank. Analytical results indicate petroleum hydrocarbons are not present in the soil sample. Sam lin Event Underground Tank On October 31, 1988, a Kleinfelder field geologist collected one soil sample beneath a removed 500-gallon underground storage tank. The tank was uncovered during excavation activities associated with new construction, and the original contents of the tank are not known. A representative of San Joaquin Local Health District-(SMED), Ms. Kasey Foley, was present on October 31, 1988 while work was performed. Ms. Foley said the (SJLHD) had the tank listed as a heating oil tank and requested analyses for diesel fuel. Sample 18149 was collected approximately 1.5 feet beneath the center of the removed tank. The sample (18149) consisted of a dark red brown silt with approximately 20 percent clay. Voids and root channels were visible throughout the sample. No staining or indications of petroleum hydrocarbons were present in the sample or the soil beneath the removed tank. A sample, collected adjacent to sample 18149, was scanned with a portable flame ionization detector (FID). There was no response on the FID when this sample was scanned. The former tank location is shown on Plate 2, Sample Location Map. The sample was delivered under chain-of-custody control to Chemwest Analytical Laboratories, Inc. in Sacramento, California. The sample was analyzed for: total petroleum hydrocarbons (TPH) extractable by GC-FID; and benzene, toluene, ethylbenzene, and xylene (BTEX) by EPA Method 8020. No constituents were detected above the laboratory reporting limits in the soil sample. Copies of the laboratory data sheets and chain-of-custody form are attached.