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0 <br /> San Joaquin County <br /> Environmental Health Department <br /> DIRECTOR <br /> W:: ,"—`�" ? 600 East Main Street Donna Heran,REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Robert McClellon, REHS <br /> ' <br /> cJeff Carruesco,REHS, RDI <br /> 4�lFo'R'`P Website: WWW.sjgov.org/ehd Kasey Foley,REHS <br /> Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> April 15, 2010 <br /> Ms. Mabel Keir Ms. Nereida P. Lopez <br /> 1103 Grantland Court P. O. Box 6569 <br /> Modesto, California 95350 Stockton, California 95206 <br /> Subject: Lopez Properties <br /> 1601 Turnpike Road <br /> Stockton, C lifornia 95206 <br /> Dear Ms. Keir and Ms. opez: <br /> The San Joaquin Court Environmental Health Department (EHD) has received and reviewed <br /> Ozone Bench Scale Pilot Study Work Plan, dated March 3, 2010, prepared and submitted by <br /> Advanced GeoEnvironmental, Inc. (AGE) on your behalf for the above-referenced site. By <br /> letter dated April 2, 2000, the EHD approved the submittal of a work plan for an ozone bench- <br /> scale test, and proposed that a feasibility study/remedial action plan be submitted to identify a <br /> remedial technology, or a combination of technologies, capable of mitigating petroleum <br /> hydrocarbon contamination beneath your site. In response, AGE has submitted this work plan <br /> to provide the data necessary to identify adverse effects to water quality by ozone injection, <br /> and if present, project the time required to restore the aquifer to background levels. The <br /> results from the bench- cafe test will be used to evaluate the feasibility of in-situ chemical <br /> oxidation with ozone as One possible remedial method. <br /> In the ozone injection b nch-scale pilot test, AGE proposes to collect discreet soil samples <br /> from proposed soil bo 'ng BST-1 illustrated in Figure 2 of the work plan. Soil will be <br /> lithologically characteriz d and field-screened for volatile organic compounds using an organic <br /> vapor meter with a photo- ionization detector. Proposed soil samples will be collected at <br /> depths of approximately twenty, twenty-five, thirty, fifty, fifty-five, sixty, and sixty-five feet <br /> below surface grade ( sg) using either direct push or hollow stem auger soil sampling <br /> technology. AGE propo, es to collect a minimum of one gallon of groundwater from the two <br /> most impacted wells, MW-1, screened from ten to thirty feet bsg, and MW-10, screened from <br /> fifty to sixty feet bsg. <br /> AGE proposes to perform the bench-scale test on two sets of samples. One set will consist of <br /> combining soil samples Collected from soil boring SBT-1 at approximately twenty, twenty-five, <br /> and thirty feet bsg wiff groundwater collected from MW-1; and one set will consist of <br /> combining soil samples collected from soil boring SBT-1 at approximately fifty, fifty-five, sixty, <br /> and sixty-five feet bsg wth groundwater collected from MW-10. AGE proposes that the soil <br /> and groundwater will be combined at a ratio of approximately one thousand grams of soil to <br />