SITE INFORMATION AND CORRESPONDENCE_CASE 2 FILE 2

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ENVIRONMENTAL HEALTH'f)EPARTMENT SAN JOAQUIN COUNTY 2 x Unit Supervisors .: K.y Donna KHeran R.E.H.S. Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. Mike Huggins,R.E.H.S.,R.D.l. Al Olsen,R.E.H.S. StOCktOri, California 95202-2708 Douglas W.Wilson,R.E.H.S. oq . Nuc Program Manager Tele hone: (209) 468-34,20 Margaret Lagorio,R.E.H.S. <<Foa Laurie A.Cotulla,R.E.H.S. p Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S. Mark Barcellos,R.E.H,S. DENIS L BROWN JUN 2 4 2005 SHELL OIL PRODUCTS 20945 S WILMINGTON CARSON CA 90810-1039 RE: SHELL Sites in San Joaquin County A meeting was held on June 9,2005,at the office of San Joaquin County Environmental Health Department(EHD). Attending the meeting were you representing Shell Oil,Joe Neely and Aubrey Cool representing Cambria Environmental Technology,Inc.,and Margaret Lagorio,Nuel C. Henderson,Jeff Wong,Harlin Knoll,Michael Infurna,Lori Duncan,and Vicki McCartney representing EHD. There was a general discussion about preparing cross sections that have lithological correlations with interpretations of the subsurface and including them in site conceptual models (SCM)prepared for each site. The following is a synopsis of the status and/or site specific discussions at the meeting. 3011 Benjamin Holt,Stockton A third geologic cross section is to be prepared that extends from the contaminant source area to newly installed monitoring well MW13 and is to be included in an updated SCM. In the conclusions and recommendations of the August 14,2004,SCM,it was stated that MTBE was no longer a fuel-- component at this site, that concentrations of MTBE were declining and expected to continue .- ' declining and that case closure may be warranted. If this is the conclusion and recommendation of the updated SCM,then a closure report should be prepared as discussed in the Tri-Regional Board Staff Recommendations dated April 16,2004. 1313 Charter Way,Stockton An SCM is to be prepared for this site and can be included in the next quarterly monitoring report. The contaminant of concern at this site is 1,2-DCA. If it can be demonstrated that the 1,2-DCA plume has been adequately characterized on-site and off-site and that action to remediate the mass of contamination is not necessary,then a closure report should be prepared as discussed in the Tri- Regional Board Staff Recommendations dated April 16,2004. 620 Charter Way,Stockton The comments provided in the EHD letter dated May 18,2005,were discussed. It was agreed that CPT borings would be advanced and the data would be used to decide where monitoring wells > would be installed. 440 Charter Way,Stockton It was stated that the off-site property owner had not responded to the access agreement request. Cambria will follow up on securing an access agreement and proceed with implementation of the work plan approved December 13,2004.