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e , <br /> b� 1 <br /> t, <br /> 1 � ! <br /> KLEINFELDEK <br /> March 22, 1989 may" <br /> File 20-2332-06 <br /> ...y w <br /> � <br /> -� f <br /> Gay ` f <br /> Mr. Walt Nichols * <br /> City of Stockton <br /> Department of Public Works, Room 317 �,s �� <br /> 425 North El Dorado <br /> Stockton, CA 95202 <br /> � 1 <br /> SUBJECT; Sampling Results <br /> 134 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 /> 1,200-gallon underground storage tank (UGST), located at 134 South Sutter Street, <br /> Stockton, California (Plate 1, Site Location Map) A sample was obtained from the floor <br /> and north sidewall of the new excavation and submitted for chemical analysis Total <br /> petroleum hydrocarbons and benzene, toluene, ethylbenzene, and xylene were not <br /> indicated in the analysis of the two samples <br /> Previous Activities <br /> A 1,200-gallon UGST was uncovered during excavation activities associated with new <br /> construction at the site. The location of the UGST is shown on Plate 2 As the contents of <br /> the tanks were unknown, a sample of the liquid found in the tank was obtained by a <br /> Kleinfelder geologist on February 10, 1989, and subrrutted for laboratory analysis The <br /> analytical results indicated the liquid sample was 46 percent diesel by weight The <br /> remainder of the sample was composed primarily of water Refer to Kleinfelder's report <br /> dated February 17, 1989, for analytical results of the liquid. sample <br /> On February 23, 1989, the tank was emptied of its contents and removed from the <br /> excavation A Kleinfelder geologist collected two samples from the native soil, one sample <br /> approximately 2 feet below each end of the tank bottom Sample 31034 was collected from <br /> the west end of the excavation, and Sample 31035 was collected from the east end Sample <br /> locations are shown on Plate 3 Both samples were taken approximately 8.5 feet below <br /> ground surface The soil consisted of a medium brown, moist, silty clay Samples were <br /> analyzed by California Analytical Laboratory/Enseco for total petroleum hydrocarbons <br /> (TPH) extractable (Method 3550) by GC/FID, and benzene, toluene, ethylbenzene and <br /> xylene (BTEX) by EPA Method 8020 Sample 31035 (east end of the UGST}diad_ a <br /> concentration of 110 mg/kg TPH. Further investigation for the pre ex"-Of�`soA <br /> contamination within the excavation was re ueste y San Joaquin Locallath Distric- <br /> (SJLHD) because of the TPH concent atio a ec ed in Sample 31035 <br /> L <br /> 0 FitiFR nFi2 n7ati Rii4in(-- P7rk nrive ',-irnmento CA 95827 f9W 3661701 <br />