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I <br /> C A M B R I A FF�y 2 4 2006 <br /> ,) Mr Jeffrey Wong ENVIRCN;NIE N T HEALTH February 15, 2006 <br /> San Joaquin County Environmental Health Department PERMIT/SERVICES <br /> 304 East Weber Avenue, Third FIoor <br /> Stockton, California 95202 <br /> Re Subsurface Investigation and Fourth Quarter 2005 Groundwater Monitoring <br /> Report <br /> Independent Shell-branded Service Station <br /> 4315 Waterloo Road <br /> Stockton, California <br /> Incident No 98996183 <br /> SJCEHD Site No 1760 <br /> Cambria Project No 248-1359-006 <br /> Dear Mr Wong <br /> Cambria Environmental Technology, Inc (Cambria) prepared this report on behalf of Equilon <br /> Enterprises LLC dba Shell Oil Products US (Shell) to document the recent investigation activities <br /> at the referenced site The purpose of the investigation was to further assess the extent of <br /> gasoline constituents in soil in the vicinity of the dispenser islands and in groundwater beneath <br /> the site Cambria followed the scope of work presented in our September 17, 2004 Site <br /> Investigation Work Plan and July 5, 2005 Site Investigation Work Plan Addendum, which were <br /> approved in San Joaquin County Environmental Health Department's (SJCEHD's) April 4, 2005 <br /> and November 9, 2005 letters to Shell Cambria performed the work in accordance with <br /> SJCEHD and Central Valley Regional Water Quality Control Board guidelines <br /> SITE LOCATION AND DESCRIPTION <br /> The subject site is an active independent Shell-branded service station located on the north side of <br /> Waterloo Road near Piccoli Road in a mixed industrial and agricultural area in Stockton, <br /> California(Figure 1) Shell ceased operations at the site during March 2005 and sold the property <br /> and station to the current owner during May 2005 Prior to their removal, two underground <br /> storage tanks (USTs) and four dispensers were present at the site (Figure 2) <br /> tambna PREVIOUS INVESTIGATIONS <br /> Environmental <br /> Technology, Inc 1994 UST Removal During December 1994, four single-walled steel USTs (two 5,000-gallon, <br /> soHollis Street one 7,000-gallon, and one 8,000-gallon) and associated product piping were removed Petroleum <br /> , A hydrocarbons were detected in soil samples collected from the former UST excavation Over- <br /> Emeryville CA94608 <br /> Tel(510)420-0700 <br /> Fax(510)420-9170 <br />