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t <br /> amec <br /> March 19, 2010 <br /> Project 14443.010.0 <br /> Ms. Lori Duncan t [: 2 2 201� <br /> San Joaquin County ENVIRONMENT HEALTH <br /> Environmental Health Department PERMIT/SERVICES <br /> 600 East Main Street <br /> Stockton, California 95202-3029. <br /> Subject: Site Investigation And Air Sparging Pilot Test Work Plan <br /> Dear Ms. Duncan: <br /> On behalf of the California Department of Transportation (Caltrans), AMEC Geomatrix (AMEC) <br /> is pleased to submit the attached Site Investigation and Air'Sparging Pilot Test Work Plan for <br /> the Caltrans Stockton Yard Maintenance Station located at 1604 South B Street in Stockton, <br /> California. <br /> The current approach for remediation at the Site includes installation of soil vapor extraction <br /> (SVE)/air sparge (AS) system to remediate the remaining petroleum hydrocarbon impacts in <br /> the source area. Prior to completing the design of the SVE/AS system, the extent of impacts <br /> in the source area must be known so that remediation wells can be properly located. <br /> Additionally, Site specific parameters for AS must be estimated before a design can be <br /> completed. The purpose of this work plan is to outline the field work required to characterize <br /> the source area, install AS pilot test wells, and to conduct an AS pilot test. <br /> Should you have any questions regarding this Work Plan, please contact either of the <br /> undersigned. <br /> i <br /> Sincerely yours, <br /> AMEC Geomatrix, Inc. <br /> Aeen Mower Scott W. Forbess, P.E. <br /> Project Engineer Senior Engineer <br /> [Enclosure/Attachment], <br /> f <br /> AMEC Geomatrix, Inc. <br /> 10670 White Rock Road,Suite 100 <br /> Rancho Cordova,California <br /> USA 95670-6032 <br /> Tel (916)636-3200 <br /> Fax (916)636-3208 ' • <br /> www.amecgeomatrixinc.com <br /> i <br />