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San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> PD u'�N Environmental Health Department ASSISTANT DIRECTOR <br /> Laurie Cotulla,REHS <br /> 600 East Main Street <br /> cZ< Stockton,. California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgman.REHS <br /> - Mike Huggins,REHS,RDI <br /> • C ., �P • Website: www.sjgov.org/ehd Margaret Lagorio, REHS <br /> '9��FORt� Phone: (209) 468-3420 Robert McClellon,REHS <br /> Fax: (209) 464-0138 Jeff Carruesco,REHS, RDI <br /> Kasey Foley,REHS <br /> DEC 2 8 2007 <br /> ERIC HETRICK <br /> CONOCO PHILLIPS <br /> RISK MANAGEMENT & REMEDIATION <br /> 76 BROADWAY <br /> SACRAMENTO CA 95818 <br /> RE: Tosco 76 Service Station 5886 SITE CODE: 1176 <br /> 2701 March Lane <br /> Stockton, CA <br /> San Joaquin County Environmental Health Department (EHD) has reviewed <br /> "Quarterly Status and Remediation Summary Report—Third Quarter 2007" <br /> dated October 26, 2007, prepared by Secor Internantional Inc. for the above <br /> referenced site and the EHD file for this site. <br /> The field monitoring data sheet in the report shows that monitoring well 3 is only <br /> 9.7 feet deep. This well was originally constructed to a depth of 25 feet. In a <br /> letter dated January 12, 2005, EHD noted the data sheet for the third quarter of <br /> 2004 showed the well depth was 9.68 feet deep and requested information on <br /> the status of this well. There was no follow up to that request. If the well has <br /> been damaged it must be repaired or destroyed and replaced. Information on <br /> this well should be submitted to EHD by March 1, 2008. <br /> Both the second and third quarter 2007 monitoring reports recommended <br /> performance of a one time hydrogen peroxide injection using MW-1, MW-91, MW- <br /> 9D, MW-10S, MW-101, and MW 1 O and stated a work plan for hydrogen <br /> peroxide injection would be submitted. A work plan has not been submitted to <br /> EHD. Prior to injection of hydrogen peroxide, data must be provided to the <br /> Central Valley Regional Water Quality Control Board (CVRWQCB) so they can <br /> evaluate the effects of injecting the hydrogen peroxide and determine if a Report <br /> of Waste Discharge and Waste Discharge Requirements are necessary. This is <br /> accomplished by performing a bench scale test to determine the potential <br /> byproducts or breakdown products that may be formed from reactions between <br /> the injectant, the pollutants, and any naturally-occurring minerals or metals in the <br /> soil and groundwater. If you wish to proceed with this proposal, please contact <br /> Jim Barton at the CVRWQCB concerning the submittal of a work plan for this <br /> bench scale test. In addition, a technical justification for the one time hydrogen <br /> peroxide injection must be provided to the EHD that discusses the effectiveness <br /> of injecting the hydrogen peroxide and the amount that would be injected. <br />