SITE INFORMATION AND CORRESPONDENCE_FILE 2

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M San Joaquin County DIRECTOR Donna Her an, RENS Environmental Health Department oA ' c r ASSISTANT DIRECTOR 600 East Main Street Laurie Cotulla, REHS Stockton , California 95202 -3029 PROGRAM COORDINATORS Mike Huggins, REHS, RDI Margaret Lagorio, REHS cq</ FORc Website: www. sjgov. org/ehd Robert McClellon, REHS q Phone : (209) 468-3420 Jeff Carruesco, REHS, RDI Fax: (209) 464=0138 Kasey Foley, REHS March 31 , 2009 Raymond Farmer Enterprises , Inc. 3810 Fourteen Mile Drive Stockton , CA 95219 Subject: Toyota Town Site Code: 1151 610 Hunter St Stockton CA 95202 The San Joaquin County Environmental Health Department (EHD) has reviewed the Monitoring Report Third Quarter 2008 (QR) dated December 29 , 2008 , Work plan to Conduct a Feasibility Study for Ozone Pilot Testing (WP) dated August 6 , 2008, and Mass Calculations (MC) dated January, 22, 2009 , prepared by your consultant ATC Associates Inc. (ATC) for the above subject site and provides the following comments . In the WP ATC proposes installation of three ozone sparge wells, performing an ozone sparging pilot test, conducting a bench scale test if found to be appropriate, and preparation of a feasibility report. The EHD approves of conducting the bench scale test and requires it be conducted prior to installation of ozone sparge wells and conducting a field pilot study test. The bench scale test is used to determine the effectiveness of ozone in treating the contaminant and evaluate if byproducts or breakdown products may be formed in the reaction of ozone with any naturally occurring metals or minerals in the soil or groundwater. Since the EHD does not approve of the installation of the proposed ozone sparge wells at this time, a work plan must be submitted that includes proposed soil and ground water sample locations and the number of samples to be collected for conducting the bench scale bench test. This work plan should be submitted within 60 days of the date of this letter. In the QR, ATC recommends reducing the frequency of groundwater monitoring sampling in selected monitoring wells to semi-annual . The EHD approves of reducing the groundwater sampling schedule as follows until a groundwater remediation system is operated at this site: MW-4, MW-5, MW-6, MW-8 , MW-9 , and MW-10 sampled biennially; MW-7 sampled annually; MW- 1 , MW-2 , and MW-3 sampled semi-annually; and discontinuation of sampling Canapa's Well (MW-4) . Prior to operation of a groundwater remediation system , a new sampling schedule must be proposed and approved . If you have any questions , please contact Frank Girardi , at (209) 953-7868 . AJot� � Frank Girardi, RENS Marga�o , RE Senior Registered Environmental Health Specialist Program Coordinator cc: Jeanne Homsey, ATC Associates Inc. , 1117 Line Palm Avenue Ste 201 , Modesto, CA 95351 James Barton, CVRWQCB