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+ 7 <br /> San Joaquin County DIRECTOR <br /> Department <br /> Heran„REHS <br /> OPCU"!R C Environmental Health: Department ASSISTANT DIRECTOR <br /> 2, Z <br /> 600 East Main Street Laurie Cotulia,.REH& <br /> Stockton, California 95202-3029 <br /> PROGRAM COORDINATORS <br /> .;,• =. _____i_ Carl Borgman,RENS <br /> Mike Huggins,REHS,ROU <br /> ct�Li � P Website:www.sjgovorglehd Margarettagorio,REHs <br /> Phone: (2t}9)>468 3420 Robert McQlellon,REHa <br /> FAX` (2Q1 )464-0138 Jeff Carruesco,.REHS;R0..1 <br /> Kasey Foley:REHS <br /> July 15, 2008 <br /> :Joe.Toste.:ir. <br /> :JT Storage: <br /> 2.480 Toste Road <br /> Tracy, CA 95376> <br /> Subject::Curtiss Pontiac-cadillac S1TE Ct3DE: 1i��� <br /> 2450'Tost&Road <br /> Tracy, CA 95376 <br /> San Joaquin County Environmental Health Department (SJC/EH©) has reviewed Ozone <br /> Injection Bench Scale WorkPlan (Work Plan) dated May 15, 2008, and Quarterly <br /> Groundwater Monitoring Report— First Quarter 2008 (Report) dated May 29, 2008, both <br /> submitted on your behalf by Advanced GeoEnvironmental, Inc. (AGE) and has the <br /> following comments. <br /> In the Work Flan AGE proposes procedures for conducting an ozone infusion bench scale <br /> test to determine the feasibility of using ozone infusion to remediate the petroleum <br /> hydrocarbon contamination remaining in the groundwater at your site. <br /> AGE proposes the advancement of one soil boring to collect,soil samples for the ozone <br /> infusion bench scale test from the saturated zone at depths of 15 feet below surface grade <br /> (bsg) and 35;feet bsg. AGE states that up to twelve soil samples will be selected for <br /> analysis, and also states that sail samples from each interval will be utilized for the bench <br /> scale test. Approximately 4.4 pounds of sail sample is needed for the bench scale test. <br /> AGE states in the Work Pian Appendix C that groundwater samples for the ozone infusion <br /> bench scale test will be ollected from onsite groundwater monitoring wells IVIW=113ai d: <br /> MW-4 16dreened from 23-28=feet bsg and 5-15-foot respectively. Monitoring well IV1W-1B, <br /> however, is screened from 5-15 feet bsg. Clarification is needed to.identifj/ whether' . <br /> graundlivater sample.wilt.be collected from MW-18 which has the same screen interval;as. <br /> MVtI-4; yr <br /> MW1 1A which has a deeper sdreen'interval from 23=28 feet bsg. <br /> An addendum to the Work Plan Is Deeded to add the following analysis and procedures: <br /> 1. B. line..analysis of soil and groundwater samples must include tertiary butyl <br /> formate (TBE); bromate, bromide and tungsten:. <br /> 2. Stolchiometry or chemical equations' with concentrations in. moles of all. <br /> i.expected intermediate and end products from the reaction between the <br /> injectant and the soil and groundwater: <br /> 3. A.proposal for testing of a contingency plan to abort or reverse.geochemical. <br /> prbcesses induced by injectant: <br /> 4. Specific Iodation of the collection of the groundwater samples to be used in the <br /> .bench scale test. <br />