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y GROUND ZERO ANALYSIS, INC. 1714 Main Street Escalon,California 95320 Telephone: (209)838-9888 Facsimile: (209)838-9883 I I August 26, 1999 fc 1 Mr. Vidal Pedraza San Joaquin County Public Health Services, ; Envirorvnentai Health Division 304 E. Weber Ave., 3rd Floor r .. .r: Stockton, CA 95202 ' Subject: Underground Storage Tank Closure Report 1501 W. Charter Way, Stockton, CA(Figure .1) Dear Mr. Pedraza: Ground Zero Analysis, Inc. (Ground Zero) submits this Underground Storage Tank Closure Report on behalf of Woolsey Oil, Inc. to document the activities conducted at the subject property. On July 13, 1999, during excavation activities on the subject.property, one 350 gallon underground storage tank(UST) was discovered. On July 16, 1999, under permit issued by the San Joaquin County Public Health Services, Environmental Health Division. (PHS%EHD) Johnson Petroleum Service removed the UST. The tank was identified as.number 39-51.5216 and was-assumed to have formerly contained waste oil. Figure 2 depicts the location of the fonner UST. - Prior to removal the tank was exposed, urn ed.d and inerted through the application of d ice. P � P P -dry g PP �' � Upon completion of the inerting procedure, the tank was removed and examined for compromises of tank integrity. Upon examination it was noted that a small puncture and crack had developed along the seam on the west side of the tank. Some surface rust was also present on the west end. Observations of tank condition are recorded in the Tank Removal Soil:Sampling Report included as Attachment,A to this letter. Residual tank contents and rinsate were transportedto Ramos Environmental in Sacramento by Asbury Environmental Services under hazardous"waste inanifest No. 99239224. The UST was transported to Triangle, Inc. in Sacramento-for disposal recycling. Copies of the hazardous waste manifest and the tank disposition tracking records.are included in Attachment B. Two soil samples were collected by Ground Zero personnel:under the direction of PHS/EHD. One sample was collected from native soil in the UST pit at a-depth of 9 feet, and one composite sample was collected from the stockpiled soil.