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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> p.? ''" "' •.0 f" Donna Heran,REHS <br /> Z r -F2� y 2 1868 East Hazelton Avenue PROGRAM COORDINATORS <br /> Stockton, California 952056232 Robert Mccleuon,RENS <br /> I_LSLl Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> •.. '. �P Website: www.sjgov.org/ehd Linda Turkatte,REHS <br /> q�/FORS Phone: (209) 468-3420 <br /> Fax: (209)464-0138 <br /> December 28, 2012 <br /> Mr. Denis L. Brown <br /> Shell Oil Products US <br /> HSE — Environmental Services. <br /> 20945 South Wilmington Avenue <br /> j Carson, California 90810-1039 <br /> Subject Interstate Shell <br /> 620 West Charter Way <br /> Stockton, California 95206 <br /> In view of the site closure recommendation by the State Water Resources Control Board, <br /> the San Joaquin County Environmental Health Department (EHD) is going to move this <br /> site to closure. <br /> The EHD will not comment about Feasibility Study & Corrective Action Plan, dated 12 <br /> October 2011, submitted by your consulting firm, Conestoga-Rovers & Associates as the <br /> report and its recommendations are now moot. Please submit a closure summary report <br /> that addresses the criteria set forth in the recently adopted Low Threat Closure Policy <br /> LTCP and that includes data listed in Table 1 of Appendix A of the Tri-Regional <br /> Guidelines. While all items in Appendix A should be addressed, the EHD is particularly <br /> interested in the following to facilitate closure consideration: <br /> Cross sections, or references to reports with cross sections, that show correlated <br /> � soil lithologies, contaminant concentrations, lateral and vertical extents of <br /> impacted soil and groundwater, and contaminant migration pathways; <br /> Tables of current and historical soil and groundwater data; <br /> Calculations showing current estimates of the residual dissolved and adsorbed <br /> 1 total petroleum hydrocarbons as gasoline (TPH-g) and methyl tertiary-butyl ether <br /> (MTBE) contaminant masses; <br /> + An estimate of the future impact to groundwater from adsorbed contaminants; <br /> An estimate of the projected maximum plume extent resulting from the modeled <br /> additional impact of groundwater; and <br /> An estimate of when site conditions will meet water quality objectives (WQOs). <br />