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Vi 40 Gold Camp Drive, Suite 160 <br /> Rancho Cordova, CA 95670 <br /> • (91.6) 853-9293 FAX (916) 85379297 <br /> December 21, 1998 BSK No. 07-4-00183 <br /> Mr. Joseph A. Aldridge,.RG <br /> Senior Project Manager <br /> Ultramar, Inc. <br /> 525 West Third Street <br /> Hanford, CA 93230 <br /> Subject: UST Closure Report <br /> Beacon Station No. 492 <br /> 470 North Main Street <br /> Manteca, California <br /> Dear Mr. Aldridge: <br /> BSK& Associates (BSK) has prepared this UST'Closure Report to summarize field sampling <br /> activity, laboratory analytical results, and field observationsassociated with the removal of <br /> underground gasoline storage tanks at.470 North Main Street in Manteca,;California. This report <br /> also includes documentation of the management of soil removed:during the removal and <br /> replacement of the underground storage tanks at Beacon Station No.492 (the Site): <br /> BACKGROUND <br /> In December 1986 RESNA Industries (RESNA) drilled and sampled three borings;which were <br /> subsequently converted to groundwater monitoring wells. Laboratory analytical result&indicated <br /> that both soil and groundwater had been.impacted by petroleum hydrocarbons. In October 1988 <br /> RESNA managed the construction of four vapor extraction wells,from which EVAX <br /> Technologies conducted vapor extraction operations-between October and November 1988. <br /> In a letter dated April 18, 1991; the San Joaquin County Environmental.Health Division <br /> requested that an additional groundwater monitoring well be constructed downgradient from the <br /> tank cavity. RESNA completed constructionof the.well in February 1992;.including soil <br /> sampling and chemical analyses. Petroleum hydrocarbons were-not detected in the soil:sample: <br /> Quarterly groundwater monitoring was conducted by RESNA between-December 1986 and July <br /> 1992. According to RESNA(report dated November 10, 1992), groundwater samples did not <br /> yield detectable petroleum hydrocarbons from March 1.991 through cessation of groundwater;' " <br /> sampling in July 1992.. <br /> Geotechnical Engineering Engineering Geology • Environmental Services • Construction"Inspection &'Testing'- Analytical Testing <br />