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CAMBRIA Ell IEIEYF[0 <br /> • J UN 0 7 2002 June 5,2002 <br /> Mr Mike Infurna U."INUUMENT HEALTH <br /> San Joaquin County Public Health Services PEF I M1ITf SERVICES <br /> Environmental Health Division <br /> 304 East Weber Street,Third Floor <br /> Stockton, California 95202 <br /> Re Site Investigation Work Plan/Response Letter <br /> Shell-branded Service Station <br /> 2494 East Fremont Street <br /> Stockton,California <br /> SAP Code 136141 <br /> Incident No 98996181 <br /> SJCPHS Site 506171 <br /> Dear Mr Infurna <br /> Effective March 1, 2002, Equiva Services LLC and Equilon Enterprises LLC are now doing <br /> business as (dba) Shell Oil Products US Cambria Environmental Technology, Inc (Cambria) <br /> prepared this work plan on behalf of Shell The work proposed in this work plan was <br /> recommended by Cambria in our October 10, 2001 Site Investigation Report In general, the <br /> scope of work presented in this work plan includes installing deep monitoring wells to allow for <br /> is repeated monitoring of deep groundwater at this site and to drill additional soil bonngs to further <br /> delineate the extent of gasoline constituents in deep groundwater at this site The work plan <br /> presented below is written to comply with San Joaquin County Public Health Services <br /> Environmental Health Division (SJCPHS/EHD), and Regional Water Quality Control Board <br /> (RWQCB)guidelines <br /> A complete site background for this site is contained in the site investigation report issued <br /> October 10,2001 <br /> TECHNICAL RATIONALE FOR PROPOSED SCOPE OF WORK <br /> a Gasoline constituents have been detected in deep groundwater beneath the site during <br /> Oakland CA previous site investigations Repeatable monitoring of the deep groundwater is warranted to <br /> San Ramon CA determine concentration trends over time Cambria proposes installing deep monitoring <br /> So n o m a, CA wells to monitor deep groundwater quality beneath the subject site <br /> Cambria <br /> Environmental • The lateral extent of gasoline constituents in deep groundwater has not been delineated north <br /> Technology,Inc and northwest of the site Cambria proposes drilling soil borings north and northwest of the <br /> 0 site to assess groundwater quality <br /> erkins Street <br /> P O Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />