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ENVIRONiMENTAL HEALTH%EPARTMENT <br /> SAN JOAQUIN COUNTY <br /> v 'a Donna K.Heran,R.E.H.S. Unit Supervisors <br /> w. ` Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> q��FOPN�Q' 209 Program Manager Tele hone: Douglas W.Wilson,R.E.H.S. <br /> Laurie A.Corolla,R.E.H.S. p ( ) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Mark Barcellos,R.E.H.S. <br /> GEORGE AND MEI TERANISHI SEP 16 2005 <br /> 1600 DURHAM FERRY RD <br /> TRACY CA 95376 <br /> RE: GEORGES SERVICE Site Code: 1550 <br /> 1600 DURHAM FERRY RD <br /> TRACY CA 95376 <br /> San Joaquin County Environmental Health Department (EHD) has received and <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 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 sparger 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 of <br /> fieldwork. <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 />