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L� V <br /> San Joaquin County DIRECTOR <br /> Q u N Donna Heran, REHS <br /> Environmental Health Department <br /> ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,REHS <br /> 0.; :{ Stockton, California 95202-3029 <br /> PROGRAM COORDINATORS <br /> Carl Borgman,REHS <br /> Cq`,� �P Website: www.sjgov.org/ehd Mike Huggins,REHS, RDI <br /> F 6-it, orio,REHS <br /> Phone: (209)468-3420 Robert M CMargaret ellon,REHS <br /> Fax: (209)464-0138 ,teff Carruesco,REHS,RDI <br /> Kasey Foley, REHS <br /> January 30, 2009 <br /> Mr. Nathan Crum <br /> Woolsey Oil Inc <br /> 166 Frank West Circle <br /> Stockton CA 95206 <br /> Subject Woolsey Oil Cardlock APN:16337016 <br /> 1501 W. Charter Way RO#: 0000640 <br /> Stockton, CA 95206 CUF#: 014328 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Site Conceptual Model <br /> for Low Risk Ground Water Closure Evaluation dated January 13, 2008, submitted by Ground Zero <br /> Analysis Inc. for the above subject site and provides the following comments. <br /> This comprehensive report covers the site investigative and remedial activities for this active card lock <br /> fuel station from 1999 to 2008. <br /> Based on soil and ground water data collected over these years, your consultant has concluded that the <br /> small area of ground water contamination located around MW-3 in the center of the current fuel dispenser <br /> area is stable and generally diminishing in concentration over time and poses no threat to the public or <br /> receptors. A test to evaluate the potential for injecting a chemical oxidant (RegenOxTM ) into the ground <br /> water was conducted and the results indicated this chemical would not work at this site. No other <br /> compound was evaluated for injection and your consultant concluded that no other remedial option would <br /> be cost-effective in cleaning up the small residual mass remaining near MW-3. <br /> The EHD considers the ground water plume laterally and vertically delineated and that no more <br /> investigation is needed at this time. The stability of the ground water plume does not show a clear pattern <br /> of stability for Total Petroleum Hydrocarbons as Diesel (TPHd) with ground water concentrations in the <br /> hundreds of parts per billion one quarter and then in the thousands of parts per billion the next. The EHD <br /> requires you to submit a professional evaluation that discusses and supports a timeline that shows when <br /> the residual contamination will reach background levels or water quality objectives. <br /> In order to better evaluate the risk to the public the residual petroleum may provide, the EHD requires you <br /> to collect soil vapor samples and conduct a vapor intrusion evaluation. The vapor concentrations can be <br /> evaluated by using the San Francisco Bay Regional Water Quality Control Board (SFBRWQCB) <br /> Environmental Screening Levels (ESL). Please submit a work plan that addresses this requirement by <br /> March 2, 2009. <br /> Thank you for your patience and cooperation during this review process. If you have any questions, <br /> please contact Michael Infurna, Senior Registered Environmental Health Specialist at(209)468-3454. <br /> (2A _7Y _�f�Michael J. Infurna Jr., Margare agorio, REHS <br /> Senior Registered Environmental Health Specialist Program Coordinator <br /> c: Mr. James L. Barton—CVRWQCB, Rancho Cordova, CA <br /> Mr. Mark Owens- SWRCB-CUF, PO Box 944212, Sacramento, CA 94244-2120 <br /> Mr. Eric Price-Ground Zero Analysis, 1714 Main St., Escalon, 95320 <br /> Mr. Richard McPherson, 1459 N. Garnica Dr., Stockton, 95215 <br /> Ms. Karen Collin - Environmental Closures, 7574 Shoreline Dr. Stockton 95219 <br />