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C A M B R I A <br />Cl <br />Oakland, CA <br />Sonoma, CA <br />Portland, OR <br />Seattle, WA <br />Cambria <br />Environmental <br />Technology, Inc. <br />270 Perkins Street <br />P.O. Box 259 <br />Sonoma, CA 95476 <br />Tel(707)935-4850 <br />Fax(7o7)935-6649 <br />August 18, 1999 <br />Ms. Letitia Briggs <br />San Joaquin County Public Health Services <br />Environmental Health Division <br />304 E. Weber Avenue, Third Floor <br />Stockton, California 95202 <br />Re: Underground Storage Tank Removal Report <br />Former Shell Service Station <br />1313 E. Charter Way <br />Stockton, California <br />SAP Code 136138 <br />Dear Ms. Briggs: <br />Cambria Environmental Technology, Inc. (Cambria) prepared this report on behalf of Equiva <br />Services LLC (Equiva) to document the underground storage tank (UST) removal and site <br />demolition at the above referenced site. Cambria performed inspections and soil sampling <br />following the removal of three gasoline USTs, four fuel dispenser islands, and associated <br />product piping. The work was performed to comply with the San Joaquin County Public <br />Health Services (SJCPHS) and Central Valley Regional Water Quality Control Board <br />(RWQCB) guidelines. <br />SITE BACKGROUND <br />Site Description: The subject site is located on the northeast comer of Airport Way and <br />E. Charter Way in a mixed commercial/residential area of Stockton, California (Plate 1). <br />The former site layout included two station buildings, three fuel USTs, and four dispenser <br />islands (Plate 2). K.E. Curtis Construction Company, Inc. of Newbury Park, California <br />demolished the service station during April 1999. <br />SAMPLING ACTIVITIES AND SAMPLE ANALYSIS <br />UST Removal. Three 10,000 -gallon single-wall steel gasoline USTs were removed on <br />April 29, 1999. Ms. Letitia Briggs of the SJCPHS and Cambria field staff were present to <br />witness the removal and condition of the tanks. The tanks were in good condition with no <br />obvious indications of failure. <br />UST Soil Sampling: Cambria collected soil samples from the bottom of the UST excavation <br />at locations specified by Ms. Briggs. Six samples (TS -A through TS -F) were collected at <br />depths ranging from 14.0 to 15.0 feet below grade (fbg) (Plate 2). Soil samples were <br />