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San Joaquin County <br /> DE'4 u• ' "' Environmental Health Department DIRECTOR <br /> Donna Heran, REHS <br /> r. ' 600 East Main Street <br /> PROGRAM COORDINATORS <br /> < Stockton , California 95202-3029 ILL <br /> Robert McClellon, REHS <br /> ..—_ Jeff Carruesco, REHS, RDI <br /> � ' • \1 Wewww.SIgov. org/ehd wwsjgov. org/ebd Kasey Foley, REHS <br /> o R `d Linda Turkatte, REHS <br /> Phone : (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> January 9, 2012 <br /> Raymond Farmer Enterprises , Inc. <br /> 3810 Fourteen Mile Drive <br /> Stockton , CA 95219 <br /> Subject: Farmer Property Site Code: 1151 <br /> 610 Hunter St <br /> Stockton CA 95202 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Ozone Injection <br /> Feasibility Report, dated April 8, 2011 , and First Semi Annual Monitoring Report 2011, prepared by <br /> your consultant ATC Associates Inc. (ATC) and submitted on your behalf for the above subject site. In <br /> the Reports, ATC concludes that ozone sparging appears to be a suitable and effective alternative for <br /> remediating petroleum hydrocarbon-impacted soil in the saturated zone and groundwater beneath the <br /> site. ATC conducted a limited duration ozone treatment pilot test for approximately 30 days using <br /> ozone injection in the saturated zone in the on-site source area. <br /> In a work plan (WP) , ATC proposed installation of three ozone sparge wells for the test. However, the <br /> additional wells were not installed and ozone was injected utilizing two existing on-site air sparge <br /> wells (AS-1 and AS-2) that were converted for ozone diffusion. <br /> The EHD approves ATC's recommendation in the Reports to conduct ozone sparing for additional <br /> corrective action and ground water cleanup. EHD directs you to submit a WP by February 29, 2012, <br /> to perform continuous ozone sparging utilizing the existing wells and piping infrastructure. <br /> After the WP is approved by the EHD, the full scale ozone injection remediation must begin within 60 <br /> days. Prior to conducting the full scale operation , contact Mr. James Barton with the Central Valley <br /> Regional Water Quality Control Board (CVRWQCB) at (916) 464-4615, concerning the requirements <br /> for a General Permit for injecting oxidants into the subsurface. You may not inject any substances <br /> into the subsurface without the approval of the CVRWQCB . <br /> If you have any questions , please contact Harlin Knoll , at ((2,09) 468-3442 . <br /> Harlin Knoll , REHS Nuel C. Henderson , Jr. , PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> cc: Jeanne Homsey, ATC Associates Inc. , 1117 Line Palm Avenue Ste 201 , Modesto , CA 95351 <br /> James Barton , CVRWQCB <br />