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San Joaquin County DIRECTOR <br /> Donna Heran, REHS <br /> Environmental Health Department M ASSISTANT DIRECTOR <br /> z r 600 East Main Street Laurie cotuua,REHS <br /> Q 1, <br /> ` Stockton, California95202-3029 PROGRAM COORDINATORS <br /> • Mike Huggins,REHS, RDI <br /> Margaret Lagorio,REHS <br /> cq :R :° Website: www.sjgov.org/ehd Robert McClellon,REHS <br /> Phone: (209)468-3420 .teff Carruesco,REHS,RDI <br /> Fax: (209)464-0138 Kasey Foley,REHS <br /> February 24, 2009 <br /> Paul Verma <br /> City of Tracy <br /> 520 Tracy Boulevard <br /> Tracy, CA 95376 <br /> Subject: Wastewater Treatment Plant Site Code: 2330 <br /> 3900 Holly Drive <br /> Tracy, CA 95376 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Limited Phase I <br /> Investigation (Report) dated January 14, 2009, submitted on your behalf by Wright Environmental <br /> Services, Inc. (Wright)and has the following comments. <br /> The Report documents the advancement of five direct push Geoprobe soil borings and collection of soil <br /> and grab groundwater samples for analysis. Wright also performed a sensitive receptor survey to identify <br /> all wells and potential receptors located within a 2000-foot radius of the former UST area. <br /> The five Geoprobe borings were located surrounding the previous four Geoprobe borings. Analytical <br /> results reported detections of total petroleum hydrocarbons as diesel (TPHd) in soil samples from three of <br /> the borings and in all of the grab groundwater samples, though at concentrations lower than those <br /> reported in a previous phase of Geoprobe boring grab groundwater samples. <br /> In the Report Wright recommends the site be considered for regulatory closure. The EHD does not agree <br /> with this recommendation at this time. This decision is subject to appeal to the State Water Resources <br /> Control Board (State Water Board), pursuant to H&SC Section 25296.40(a)(1), (Thompson-Richter <br /> Underground Storage Tank Reform Act — Senate Bill 562). Please contact the State Water Board <br /> Underground Storage Tank Program at (916) 341-5752 or visit the State Water Board internet website at <br /> http://www.waterboards.ca.gov/water issues/programs/ust/cleanup/petitions! html for information <br /> regarding the appeals process. <br /> The EHD directs submittal of a work plan to install groundwater monitoring wells to verify the <br /> concentrations of contaminant impact to groundwater at your site, and to establish the groundwater <br /> gradient and flow direction. Please submit the work plan to the EHD no later than April 27, 2009. <br /> If you have any questions please call Lori Duncan at (209)468-0337. <br /> Sincerely, <br /> (Z� 1" <br /> Lori Duncan, REHS Nuel C. Henderson, Jr., PG <br /> Registered Environmental Health Specialist Engineering Geologist <br /> c: James Barton, CVRWQCB, 11020 Sun Center Drive, Suite 200, Rancho Cordova CA 95670 <br /> John Lynch, Wright Environmental, 2395 East Pescadero Avenue, Tracy CA 95304 <br />