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San Joaquin County DIRECTOR , <br /> Donna Heran, REHS <br /> Environmental Health Department <br /> ASSISTANT DIRECTOR <br /> � oG , <br /> fi00 East Main Street Laurie Cotulla, REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Mike Huggins, REHS, RDI <br /> i PMargaret Lagorio,REHS <br /> :- :• Website: www.sjgov.org/ehd <br /> Robert McClellon, REHS <br /> Q L j F" <br /> Phone: (209) 468-3420 .teff Carruesco, REHS,RDI <br /> Fax: (209) 464-0138 Kasey Foley, REHS <br /> March 31, 2009 <br /> Thrifty Oil Company � , s9 <br /> Mr. Chris Panaitescu <br /> 13116 Imperial Hwy. <br /> Santa Fe Springs, CA 90670 <br /> Subject: Thrifty Gas Station #171 RO#: 0552 <br /> 1250 N. Wilson Way APN: 117-310-01 <br /> Stockton, CA 95205 Geotracker ID#: T0607700132 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed your request to reduce <br /> the quarterly sampling frequency of selected monitoring wells located on the subject site and to evaluate <br /> non-purge ground water sampling. <br /> The EHD has evaluated the ground water data on file and believes the plume of ground water impacted <br /> by the unauthorized release from your underground storage tank (UST) system can be effectively <br /> managed by reducing the peripheral monitoring wells MW-3R, MW-4, MW-6, TBA, TB-8, and TB-1,0 to <br /> E annual sampling. The remaining monitoring wells will remain on quarterly sampling and reporting <br /> schedule. i <br /> The request is adequate and approved. The annual sampling is to be conducted during the first quarter of <br /> each year, starting in 2010. All monitoring reports are due on Geotracker:by the 15th of the month ' <br /> i following the end of each quarter. <br /> The EHD also evaluated your request to conduct non-purge sampling of two monitoring wells at this <br /> Thrifty Oil site and at the Thrifty Oil site at 7647 Pacific Avenue, Stockton. The proposal is to sample two <br /> monitoring wells at each site prior to purging and again after purging each of the wells. The analytical <br /> results of each sample will be forwarded to the EHD for review. <br /> I <br /> The proposal is adequate and approved. After reviewing the analytical results for the pre-purge and post- <br /> purge groundwater samples, the EHD will notify Thrifty Oil if the purging requirement for all of the <br /> monitoring Wells.may be waived. <br /> If you have any questions, please contact Michael Infurna at(209)468-3454. <br /> a Michael J. I urns Jr., RENS Nuel C. Henderson Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. James L. Barton, CVRWQCB - 11020 Sun Center Dr., #200 Rancho Cordova, CA <br /> Mr. Mark Owens, SWRCB-CUF— P.O. Box 944212 Sacramento, CA, 94244-2120 <br /> r <br /> r <br />