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.� t( 7 <br /> CAM B RIA <br /> 40 , APR 1 2 2004 <br /> ENVIRONMENT HEALTH April 9, 2004 <br /> PERMIT/SERVICES <br /> Ms Lon Duncan <br /> San Joaquin County Environmental Health Department <br /> 304 E Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Site Investigation/First Quarter 2004 Groundwater Monitoring Report <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue <br /> Stockton, California <br /> SAP Code 136149 <br /> Incident No 98996189 <br /> SJCEHD Site Code 1223 <br /> Dear Ms Duncan <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 site investigation <br /> activities at the above referenced site The purpose of the investigation was to further assess the <br /> vertical and lateral extent of petroleum hydrocarbons in soil and groundwater beneath and in the <br /> 1 vicinity of the site Cambria followed the scope of work presented in our October 3, 2003 Site <br /> Conceptual ModellSite Investigation Work Plan, which was approved in the San Joaquin County <br /> Environmental Health Department (SJCEHD) correspondence dated December 23, 2003 The <br /> SJCEHD August 12, 2003 correspondence initiated the investigation, and the work was <br /> performed in accordance with SJCEHD and Central Valley Regional Water Quality Control <br /> Board (RWQCB)guidelines <br /> SITE LOCATION AND DESCRIPTION <br /> The subject site is an active Shell-branded service station located on the southwest comer of the <br /> intersection of Pacific Avenue and Porter Avenue in a mixed commercial and residential area of <br /> Stockton, California(Figure 1) The site layout includes three existing fuel underground storage <br /> tanks (USTs), four dispensers, a service station building, and a former UST complex(Figure 2) <br /> PREVIOUS WORK <br /> Cambria 1990 Soil Bonngs During March 1990, Aegis Environmental Consultants (Aegis) of Roseville, <br /> Environmental California dnlled fourteen soil borings near the former (then existing) and current (then <br /> Technology,Inc proposed) UST locations The highest concentrations of petroleum hydrocarbons were detected <br /> *Perkins Street in a soil boring at the southwest corner of the former UST location Maximum concentrations <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tet(707)935-4850 <br /> Fax(707)935-6649 <br />