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San Joaquin County <br /> a Environmental Health Department DIRECTOR <br /> -0 Donna Heran, REH5 <br /> 600 East Main Street <br /> PROGRAM COORDINATORS <br /> N: Stockton, California 95202-3029 <br /> s Robert N;cC1ellon, REHS <br /> .:. JefCarruesco, REHS, RDI <br /> ►�' Kasey Foley, REHS <br /> Website: www.Sov.org/ehd <br /> Phone: (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> May 6, 2010 <br /> Lori Shields <br /> Diesel Performance <br /> 2804 Fremont Street <br /> Stockton, CA 95205 <br /> Subject: Diesel Performance <br /> 2804 Fremont Street <br /> Stockton, CA 95205 <br /> The San Joaquin County Environmental Health Department ( <br /> EHD) has reviewed <br /> Groundwater Monitoring and System Operation Report - First Quarter 2010 (Report) <br /> dated April 21, 2010, submitted on your behalf by ATC Associates,Inc. (ATC) and has the <br /> following comments. <br /> In the Report ATC recommends the site is ready to be considered for regulatory closure. <br /> In order to make this review, please provide a closure report that includes: <br /> 1. A calculation of contaminant mass remaining in both soil and groundwater. <br /> 2. A prediction of how long, in years,' it will ;be until the dissolved contaminant <br /> concentrations on site reach water quality objectives. <br /> 3. A review of the potential threat from vapor intrusion from the remaining <br /> contamination in both soil and groundwater. If it is considered that vapor sampling <br /> must be done, please.provide a work plan to do it. <br /> 4. Confirmation that a sensitive receptor-survey has been completed. <br /> II'I 5. All other requirements of the Tri-Regional Guidelines Appendix A. <br /> If you have any questions please call Lori Duncan.at (209) 468-0337. <br /> Sincerely, <br /> 1.er[�t �'�vw�co�✓� 'i�i�� <br /> Lori Duncan, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Jim Barton, PG, CVRWQCB, 11020 Sun Center Dr. #200, Rancho Cordova, CA 95670 <br /> Jeanne Homsey, PE, ATC, 1117 Lone Palm Avenue, #201, Modesto, CA 95351 <br />