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RE CEI V t1l SEP 0 2009 <br /> .ENVIRONMENTAL <br /> HEALTH DEPARTMENT <br /> z SAN JOAQUIN COUNTY <br /> a. a Donna K Heran RE.H.S. <br /> UszitSupervisors <br /> Director 304 East Weber Avenue, Third FIoor <br /> Al Olsen, . Carl 13orgman,R E.x.s. <br /> Program Manager RStockton, California 95202-2708 Mike Hugger R.E.H.S.,R.D.I. <br /> q<<F o'a�• • 'W: <br /> Laurie A.Cotulla,R.E.H.;S. Telephone: (209)468-3420 Douglas Wilson,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert l ClellLagotoo,R.E.H.S. <br /> McClellon,R.E.H.S. <br /> Mark Barcellos,RE.H.S. <br /> GEORGE AND MEI TEP—UTISHI <br /> 1600 DURHAM FERRY RD SEP 16 2005 <br /> TRACY CA 95376 COPY <br /> RE: GEORGES SERVICE <br /> 1600,DURHAM FERRY RD Site Code: 1550 <br /> TRACY CA 95376 <br /> San Joaquin County Environmental Health Department (EHD) has received an <br /> reviewed Feasibility Work•Plan, In Situ Remediation Pilot Test (Plan), dated 14 June <br /> 2005, prepared on your behalf by your consultant Geological Technics, Inc. (GTI). <br /> The Plan proposes: 1) Installation and operation of two ozone sparging wells and one <br /> observation well to evaluate ozone injection for remediation of groundwater impacted <br /> by <br /> contaminants released from an underground storage tank (UST) system formerly located <br /> on your site; 2) conducting a 7-day ozone injection test with one month of weekly follow <br /> up monitoring, and 3) conducting a 24- to 48-hour soil vapor extraction (SVE) test <br /> utilizing a mobile SVE unit and vapor wells previously emplaced in the excavation <br /> backfill. <br /> EHD approves the Plan, but recommends that one ozone spa rger well be located on the <br /> margin of the former UST excavation and the observation well be located more down- <br /> gradient from that ozone sparging well. Also, to meet the requirements of Jim Barton's e- <br /> mail of 24 February 2005, the analytical regimen for the ozone testing should include <br /> analyses for general minerals and for breakdown products from oxidation of the <br /> contaminants of concern, such as acetone. Please initiate field activities within 60 days <br /> of the date of this letter and submit a report of findings within 60 days of completion fieldwork. p n of <br /> Questions or comments may be directed to Nuel Henderson at (209) 468-3436. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Nuel C. Henderson, Jr., PG <br /> Unit IV- Site Mitigation <br /> C: James L.L. Barton, PG—CVRWQCB <br /> Ray Kablanow, PG — Geological Technics Inc. <br />