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C A M B R I A <br /> FEB 15 ZOOZ <br /> ENVIRONMENT HEALTH February 13, 2002 <br /> Mr Jeffrey Wong PERMIT/SERVICES <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Fourth Quarter 2001 Groundwater Monitoring/Site Investigation Report and <br /> Receptor Survey <br /> Shell-branded Service Station <br /> 4315 Waterloo Road <br /> Stockton, California <br /> SAP Code 136143 <br /> Incident No 98996183 <br /> SJCPHS/EHD Site No 1760 <br /> Dear Mr Wong <br /> Cambria Environmental Technology, Inc (Cambria) prepared this report on behalf of Equiva <br /> Services LLC (Equiva) to document the recent site investigation activities at the above <br /> referenced site The purpose of the investigation was to assess the extent of petroleum <br /> constituents in soil and groundwater beneath the site Cambria followed the scope of work <br /> presented in our August 6, 2001 Site Investigation Work Plan and approved in San Joaquin <br /> County Public Health Services, Environmental Health Division (SJCPHS/EHD) correspondence <br /> dated August 10, 2001 This investigation was performed pursuant to SJCPHS/EHD's <br /> July 5, 2001 letter to Equiva requesting additional assessment, and the work was completed in <br /> accordance with SJCPHS/EHD and Central Valley Regional Water Quality Control Board <br /> guidelines <br /> SITE BACKGROUND <br /> Site Description- The subject property is an operating Shell-branded service station located at <br /> 4315 Waterloo Road in a commercial area of Stockton, California (Figure 1) The station layout <br /> Oakland, CA includes two double-walled fiberglass underground storage tanks (USTs), two dispenser islands, <br /> San Ramon CA a service station building, and a car wash (Figure 2) <br /> Sonoma CA <br /> Cambria Previous Investigations During December 1994, four single-walled steel USTs (two 5,000- <br /> Environmental gallon, one 8,000-gallon, and one 7,000-gallon) and associated product piping were removed <br /> Technology,Inc Petroleum hydrocarbons were detected in soil samples collected from the former UST <br /> OeTkins Street excavation Over-excavation was performed and additional soil samples were collected One <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />