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VOW <br /> San Joaquin County DIRECTOR <br /> Donna Heran, RENS <br /> amu'" Environmental Health Department O h ASSISTANT DIRECTOR <br /> r � `^ ., �z� 600 East Main Street Laurie Cotulla,REHS <br /> WA, Stockton, California 95202-3029 <br /> PROGRAM COORDINATORS <br /> •' Carl Borgman,RENS <br /> Website: www.sjgov.ogr /ehd Mike Huggins, REHS,RDI <br /> cQCi O 'a�P Margaret Lagorio,REHS <br /> Phone: (209)468-3420 Robert McClellan,REHS <br /> Fax: (209)464-0138 Jeff Carruesco, REHS, RDI <br /> Kasey Foley, REHS <br /> RAY BAGLIETTO & FRANK RAUZI [JUL 0 3 2097 <br /> TULEBURG WAREHOUSE AB NAWAR <br /> 301 S AURORA STREET 8200 N HWY 99 <br /> STOCKTON CA 95203 STOCKTON CA 95212 <br /> RE: Speedy Food Mart SITE CODE: 1612 <br /> 8200 N. Hwy. 99 <br /> Stockton CA 95212 <br /> San Joaquin County Environmental Health Department (SJC/EHD) has reviewed Work <br /> Plan forAdditionai Subsurface Investigation (Work Plan) dated May 11, 2007 submitted <br /> on your behalf by Ground Zero Analysis, Inc. (GZA) and has the following comments. <br /> The Work Plan proposes the installation of one soil boring to evaluate the effectiveness <br /> of soil vapor extraction on the sorbed contamination near the former underground <br /> storage tank (UST) area, three groundwater monitoring wells to investigate the lateral <br /> and vertical extent of the groundwater contamination in the deeper zones, and one <br /> additional groundwater extraction well. The Work Plan also discusses modifications and <br /> enhancements to groundwater remediation processes in use at the site. <br /> In the May 20, 2004 report on the soil vapor extraction pilot test results, GZA calculated <br /> a radius of influence of approximately 30 feet for the vapor extraction wells. SJC/EHD <br /> approves the installation of one confirmation soil boring located near VW-2, but requests <br /> that the boring be placed near MW-1 and SB-2. The boring will be advanced by hollow <br /> stern auger; soil samples will be collected every five feet from surface to approximately <br /> 80 feet below surface grade (bsg). All samples collected from 15 feet bsg to total depth <br /> will be submitted for laboratory analysis for total petroleum hydrocarbons as gasoline, <br /> benzene, toluene, ethylbenzene, xylenes and fuel oxygenates. <br /> Three additional groundwater monitoring wells are proposed to define the vertical extent, <br /> and the lateral extent at depth, of the groundwater contamination. One "B Zone" well will <br /> be installed near MW-12; one "C Zone" well and one °D Zone" well will be installed near <br /> MW-8. SJC/EHD approves the installation of these wells, but cautions that care should <br /> be taken during installation to ensure the screen intervals and filter packs do not bridge <br /> two sand zones. A shorter (10 or 15-foot) screen interval may be more appropriate. <br /> At a meeting on January 25, 2007 GZA indicated the groundwater extraction (GWE) <br /> system in operation at this site was not ideally effective; flow rates were very low due to <br /> the aquifer properties and problems with operation of the system, including scaling, <br /> channeling and frequent contaminant breakthrough of the carbon were continuing. GZA <br /> now proposes the installation of one additional groundwater extraction well, stating that <br />