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San Joaquin County DIRECTOR <br /> Donna Heran,RENS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,REHS <br /> N - '`' �< Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgman,REHS <br /> Mike Huggins,REHS,RDI <br /> C`•.- "....;Q Website:www.sjgov.org/ehd MargaretLagorio, REHS <br /> Phone: (209)468-3420 Robert McClellon,REHS <br /> Fax: (209)464-0138 Jeff Carruesco,REHS,RDI <br /> Kasey Foley, REHS <br /> August 28, 2008 <br /> Mr. Sarbjit Singh Saraa <br /> Ms. Mary L. Gardena Trust 1305 South Wilson Way <br /> Post Office Box 968 Stockton, California 95205 <br /> Capitolla, California 95010 <br /> Estate of Mr. Joseph Gardella <br /> Mr. Dennis Caspe, Esquire <br /> 2035 North Pacific Avenue <br /> Santa Cruz, California 95060 <br /> Subject: Former Stefano's Gasoline Station <br /> 1419 East Charter Way <br /> Stockton, California 95205 <br /> By letter dated March 18, 2008, the San Joaquin County Environmental Health Department <br /> (EHD) solicited information, supported by technical justification, to be submitted by April 30, <br /> 2008, concerning the ozone sparge system currently operating at the above-referenced site. <br /> Specifically, the EHD requested al evaluation of the effectivenesof the hydrocarbon contaminantssand the beneflttto <br /> ly <br /> operating ozone sparge system at remediating the <br /> be gained by operating a six-point-sparge ozone system versus a reconfigured three-point- <br /> sparge system. Advanced GeoEnvironmental, Inc. (AGE) first proposed installing three <br /> additional sparge points in Work Plan Addendum, dated November 19, 2007. <br /> To date, the EHD has not received an adequate response to the directive. Historical data <br /> submitted in Quarterly Report - First Quarter 2008, dated July 25, 2008, does not appear to <br /> demonstrate a direct correlation between ozone injection and decreased concentrations of <br /> contaminants of concern in groundwater collected from the most impacted well, MW-2, or <br /> from MW-3, located adjacent to ozone sparge point, OZ-3. Therefore, the EHD can not <br /> approve the installation of the three proposed sparge points at this time. Historical analytical <br /> data collected quarterly since January 1999 indicate that the only impacted wells are MW-2 <br /> and MW-3. For this reason, the EHD recommends that you relocate one of the existing sparge <br /> points, screened between forty-eight and fifty feet below surface grade (bsg), to a location <br /> between MW-2 and MW-3. If the relocated sparge point demonstrates a significant influence <br /> on the concentrations of contaminants detected in MW-2, the EHD may approve installation or <br /> relocation of additional sparge points. Please respond to this recommendation and all issues <br /> raised in the EHD letter of March 18, 2008,by October 1, 2008. <br />