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I <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> OG Donna Heran,REHS <br /> a4� 600 East Main Street <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> Jeff Carruesco,RENS,RDI <br /> c FSP Website: www.sjgov.org/ehd Kasey Foley,REHS <br /> FOR <br /> Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> May 4, 2010 <br /> David Buccolo, Superintendent <br /> Central California Traction Company <br /> 2201 West Washington Street#12 <br /> Stockton, CA 95203-2942 <br /> Subject: Central California Traction Company <br /> 1645 Cherokee Lane <br /> Stockton, CA 95205 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Quarterly <br /> Monitoring Report — Fourth Quarter 2009 (Report) dated January 25, 2010, submitted on <br /> your behalf by TRC Solutions (TRC), and has the following comments. <br /> In this report TRC documents a routine groundwater monitoring and sampling event <br /> conducted at this site on November, 18, 2009, and makes a recommendation that the site be <br /> considered for low-risk closure. <br /> In order to have your site reviewed for closure, please prepare 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 discussion of the potential vapor intrusion threat from the remaining contamination <br /> in both soil and groundwater. <br /> 4. 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 /> (MA. I NV�rnt I- -u�/.Gr✓ -L- <br /> Lori Duncan, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: James Barton, CVRWQCB, 11020 Sun Center Dr. #200, Rancho Cordova CA 95670 <br /> Keith Woodburne, TRC, 1590 Solano Way#A, Concord CA 94520 <br />