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C A M B R I A <br /> August 28,2002 <br /> Mr. Mike Infurna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton,California 95202 <br /> Re: Work Plan Approval Emma <br /> V a <br /> Shell-branded Service Station <br /> 3011 West Benjamin Holt Drive SEP 0 3 2002 <br /> Stockton, California <br /> SAP Code 136148 ENVIRONMENT HEALTH <br /> © Incident No. 98996188 PERMIT/SERVICES <br /> SJCPHS Site 1883 <br /> Dear Mr. Infurna: <br /> Thank you for your work plan approval facsimile dated June 6, 2002. The work plan approval <br /> had a condition in it that we "Install phase two wells now." We are somewhat confused about <br /> the request to implement both phases of work at the same time. We have clearly described the <br /> reasoning for a phased well installation program for this site in our work plan addendum and <br /> revised work plan. The second phase of work is contingent on the findings of the fust phase. <br /> EHD has not disagreed with this approach or presented any technical reasoning as to why this is <br /> not an appropriate way to proceed at this site. <br /> Here again is our rationale for performing the well installation in a phased approach. <br /> • There is some question as to whether the grab groundwater findings from the previous <br /> investigation are representative of deep groundwater conditions beneath the site. The highest <br /> detections of MTBE at depth were from soil borings drilled in the suspected source area. It <br /> is possible shallow impacted groundwater was inadvertently introduced or mixed with the <br /> deep groundwater samples collected during drilling activities. <br /> • Confirmation of the grab groundwater sample data is warranted prior to installation of deep <br /> Oakland, CA groundwater monitoring wells at every location and depth interval where MTBE was <br /> San Ramon, CA <br /> 5 o n o m a C A detected above MCLS. Therefore Cambria proposes to initially install two groundwater <br /> monitoring wells for this purpose — one in the suspected source area and a second <br /> Cambria downgradient of the suspected source area. These wells will monitor the deep groundwater <br /> Environmental quality and validate or discount the grab groundwater sample data previously collected. <br /> Technology,Inc. <br /> 270 Perkins Street <br /> P.O.Box 259 <br /> Sonoma,CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />