Laserfiche WebLink
1117 Lone Palm Avenue, Suite B <br /> v Modesto, CA 95351 <br /> http 11www atcassociates com <br /> 209 579 2221 <br /> Fax 209 579 2225 <br /> A S S 0 C I A T B S I M C <br /> November 29, 2005 <br /> 54 26823 0001 <br /> Ms Lon Duncan ENV X005 <br /> San ronmentain lHealth Department unty PER MIT SEfitq F�trN <br /> Environmental p F,q�jeEs <br /> 304 E Weber Street, Third Floor <br /> Stockton California 95202 <br /> Subject Second Quarter 2005, Combined Groundwater Monitoring and Remediation <br /> Systems Operations and Monttonng Report, Jamar Service Station, 4075 East <br /> Main Street, Stockton, California <br /> Dear Ms Duncan <br /> This report presents the results of quarterly groundwater monitoring and sampling performed <br /> between June 2, 2005 and June 22, 2005 at the Jamar property located at 4075 East Main Street, <br /> Stockton, California (Figure 1) by ATC Associates Inc (ATC) It also reports the operations and <br /> maintenance (O&M) of the remediation system performed on Apn] 22, 2005 and May 25, 2005 <br /> in addition to that performed during the June 21- 22, 2005 groundwater monitonng event <br /> Quarterly groundwater monitoring and sampling was performed to evaluate the distribution of <br /> petroleum hydrocarbons in groundwater, the groundwater flow direction and the hydraulic <br /> gradient in the impacted aquifers O&M of the remediation system was performed to evaluate <br /> the effectiveness of the ozone air sparge system at remediating petroleum impacted soil and <br /> groundwater <br /> 1.0 SITE HISTORY <br /> In 1995, one 500-gallon waste oil underground storage tank (UST) and one 500-gallon kerosene <br /> UST were removed from the site <br /> In December 1998, two 6,000-gallon and one 10,000-gallon gasoline USTs were removed from <br /> the site Soil samples were collected from the tank pit and analyzed for petroleum hydrocarbons <br /> Lab analyses indicated the samples collected from the tank pit contained detectable <br /> concentrations of petroleum hydrocarbon constituents The excavation was subsequently <br /> backfilled and a 20,000-gallon UST was installed <br /> In September 1999, John P Cummings & Associates (JPCA) advanced three soil bonngs (MW1, <br /> MW2, and MW3) to depths ranging from approximately 74 to 78 feet below ground surface <br /> (bgs) The borings were completed as monitoring wells <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />