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Shaw Environmental, Inc <br /> 1326 North Market Boulevard <br /> Sacramento, California 95834-1912 <br /> 916-928-3300 <br /> FAX 916-565-4356 <br /> i <br /> haW a Shaw Eimronmental, Inc <br /> 1 <br /> April 4, 2006 <br /> To Ms Vicki McCartney D <br /> San Joaquin County Public Health Services FRI),E <br /> Environmental Health Division <br /> 304 East Weber Avenue APR 7 2006 <br /> Stockton, California 95202 <br /> ENVIRONMENT HEALTH <br /> cc Mr Jim Parkinson PERMIT/SERVICES� <br /> 3250 West Hammer Lane, Stockton, California <br /> Mr James Barton 4A ,� N. oc <br /> California Regional Water Quality Control Board <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, California <br /> Encl Figure 1, Groundwater Elevation Contour Map, First Quarter 2006 <br /> Figure 2, TPHg/Benzene/MTBE Concentration Map, First Quarter 2006 <br />' Table 1, Groundwater 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 /> I Subject First Quarter 2006 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 First <br /> Quarter 2006 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 /> 1. <br />