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' Shaw Environmental,lnc <br /> 1326 North Market Boulevard <br />'k Sacramento, California 95834-1912 <br /> 916-928-3300 <br /> 70 FAX 916-565-4356 <br /> Shaw® Shaw Ermronmental Inc. <br />�x <br /> April 4, 2006 <br /> To Ms Vicki McCartney _- ,_0 <br /> San Joaquin County Public Health Services FD �� W"(� <br /> Environmental Health Division � <br /> 304 East Weber Avenue <br /> i Stockton, California 95202 API? 5 � b <br /> cc Mr Jim Parkinson ENVIRONNI-CNT IIEALTH <br /> eI 3250 West Hammer Lane, Stockton, California PERMIT/SERVICES f <br /> Mr James Barton <br /> California Regional Water Quality Control BoardpF { <br /> 11020 Sun Center Drive, #200 Iv�� <br /> Rancho Cordova, California ei✓ G ]L� <br />,} End Figure 1, Groundwater Elevation Contour Map, Fourth Quarter 2005 <br /> Figure 2, TPHg/Benzene/MTBE Concentration Map, Fourth Quarter 2005 <br /> Table 1, Groundwater Elevations and Analytical Data <br /> Attachment 1, Field and Laboratory Procedures <br /> Attachment 2, Certified Analytical Reports, Chain-of-Custody Documentation, and Field Data <br /> Sheets <br /> Subject Fourth Quarter 2005 Groundwater Monitoring Report, Parkinson's Hammer 1-5 Arco, 3250 <br /> West Hammer Lane Stockton, California <br />' Dear Ms McCartney <br />' On behalf of Parkinson's Hammer 1-5 Arco, Shaw Environmental, Inc (Shaw) presents the results of the <br /> Fourth Quarter 2005 groundwater monitoring event for the above referenced property (the site) <br />' Site Background <br /> The site is located at 3250 West Hammer Lane, in Stockton, San Joaquin County, California The site is a <br />' privately owned Arco-branded service station that has retailed gasoline fuel for approximately 15 years It <br /> contains three 12,000-gallon capacity gasoline underground storage tanks (USTs) and associated product <br /> lines and dispensers Diesel fuel has never been dispensed at the site <br />' In January 2000, the station began product line upgrades and encountered petroleum hydrocarbon-impacted <br /> soil below the western fuel dispenser islands <br />' Remedial activities in January 2000 included removal of approximately 262 tons of impacted soil from <br /> • beneath and near the dispenser and product lines Excavation was restricted laterally by concrete canopy <br />' footings and asphalt surfacing, and the depth of excavation was limited to 10 feet <br />