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San Joaquin County DIRECTOR <br /> Environmental Health Department <br /> ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotu€ia,REHS <br /> t kton, California5202-3029 <br /> PROGRAM COORDINATORS <br /> Mike Huggins,REHS,R01 <br /> ebsite: www.sigovorglehdRobert.r cCie0on,REHS <br /> Phone: (209)468-3420 Jeff Carru scr,REHS,RM <br /> Fax: (209)464-0138 Kasey Fd y:REHS <br /> April 6, 2009 <br /> TO, All esponsible Parties <br /> (see attached list) <br /> Stockton Metropolitan Airport 845 <br /> 5000 South Airport Boulevard <br /> Stockton, CA 95206 <br /> The San Joaquin County Environmental health Department (lel has reviewed Work Plan, <br /> Remedial e« sibility Testing, and Groundwater Monitoring Report,, first Quarter 2009 (Work <br /> !Mari) dated March 27, 2009, submitted on your behalf by l arnage Environmental, Inc, <br /> (Ramage)and has the following comments, <br /> In the Work plan Ramage proposes to conduct feasibility pilot tests for nail vapor extraction <br /> VE) and air sparging (AS) to determine their potential effectiveness as remedial captions for <br /> mitigation of this site's sell and groundwater contamination.tion. following the tests; carnage will <br /> prepare a Problem Assessment Report and Corrective Action Plan in which they will <br /> compare SVE AS versus natural attenuation for both their ability to remediate the <br /> contamination and for cost effectiveness.. <br /> The EHD approves the proposal to conduct S E and AS feasibility tests, but does not <br /> approve the proposed locations or one of the SVE wells and the AS well. Known soil <br /> contamination exists across the site in the locations of the former underground storage tanks <br /> (UST), of which there were twenty, but none is documented near the proposed location of the <br /> AS well and the most northern proposed SVE well. The EHD recommends moving the A <br /> well closer to and upgradient of MW-1 to monitor plume response to the AS test; and roving <br /> the S E well to between MW-1 and former U <br /> If you have any questions please call Lori Duncan at 209) 468-033T <br /> Sincerely; <br /> Lori Duncan, RENS Adel C. Henderson, Jr., PCS <br /> Registered Environmental Health Specialist Engineering Geologist <br /> c: James Barton, CVRWQCB, 11020 Sun Center Drive, #200, rancho Cordova, CA 95670 <br /> Joe Rarnage, Ramage Enviro., 465 S, Meadows Pkwy Ste. 20 PMB 157 Reno, NV 89521 <br />