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San Joaquin County <br /> Environmental Health Department °rR °r°R <br /> Donna Heran,REHS <br /> 600 East Main Street <br /> Stockton, California 95202-3029 ARobeRAMcCIeI oCOORDINATORS <br /> :. <br /> Jeff Carruesco, REHS,RDI <br /> Website: www.sjgov.org/ehd Kasey Foley, REHS <br /> Phone: (209) 468-3420 <br /> Fax: (209)464-0138 <br /> June 1, 2010 <br /> Ray Bagiietto & Frank Rauzi Ab Nawar <br /> Tuleburg Warehouse 8200 North Highway 99 <br /> 301 South Aurora Street Stockton, CA 95212 <br /> Stockton, CA 95203 <br /> Subject: Speedy Food Mart <br /> 8200 North Highway 99 <br /> Stockton, CA 95212 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Site <br /> Closure Request and Semi-Annual Groundwater Monitoring Report — Winter/Spring 2010 <br /> (Report), dated March 24, 2010, submitted on your behalf by Ground Zero Analysis, Inc. <br /> (Ground Zero) and has the following comments. <br /> The Report documents a routine groundwater monitoring and sampling event conducted at <br /> this site in February 2010. Laboratory analytical results report significant petroleum <br /> hydrocarbon contamination remains in only one well, EW-1 (former MW-1) located near the <br /> former underground storage tank pit. <br /> Remediation was conducted at this site by groundwater extraction (GWE) starting in <br /> November 2003 and by soil vapor extraction (SVE) starting in August 2005, Ground Zero <br /> reports that approximately 125 pounds of total petroleum hydrocarbons as gasoline (TPHg), <br /> 14 pounds of benzene and 44 pounds of methyl tertiary butyl ether (MtBE) were removed by <br /> the GWE system, and 2,500 pounds of TPHg were removed by the SVE system. Based on <br /> decreased influent contaminant concentrations, these systems have both been shut down <br /> since February 2009. The current analytical results indicate no rebound of contaminant <br /> concentrations in the groundwater has occurred since the systems were shut down. <br /> Confirmation soil borings were installed at the site in November 2007 near the location of the <br /> former tank pit, the area subjected to SVE remediation. Laboratory analytical results reported <br /> elevated concentrations of petroleum hydrocarbon contamination only in samples collected <br /> at 70 feet below surface grade (bsg), which is near the groundwater interface. Based on <br /> these results the SVE remediation was continued, sometimes intermittently, until final <br /> shutdown in February 2009. <br /> In the Report Ground Zero provides BIOSCREEN models for TPHg and benzene, and other <br /> models for the reduction of methyl tertiary butyl ether (MtBE) concentrations in the <br /> groundwater. Using heavily conservative data inputs, the models predict that the remaining <br />