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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> 2.•' �,d,,�, �G Donna Heran,RENS <br /> 'Ax :2 600 East Main Street <br /> U)' �' , :X Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> :l-J Robert McClellon,REHS <br /> — Jeff Carruesco,RENS,RDI <br /> Kase Foley,REHS <br /> . <br /> q�j�o. a� Website: www.sjgov.Org/ehd Linda Turk tte,REHS <br /> Phone: (209)468-3420 <br /> Fax: (209)464-0138 <br /> December 21, 2010 <br /> Paul Verma Rosaia, D & NC Trust, etal <br /> City of Tracy PO Box 274 <br /> 325 Civic Center Plaza Tracy CA 95378 <br /> Tracy, CA 95376 <br /> Subject: Delta Disposal <br /> 99 West Sixth Street <br /> Tracy, CA 95376 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Response <br /> Letter Addendum for Closure Summary Report (Addendum), dated November 19, 2010, <br /> submitted on your behalf by Wright Environmental Services, Inc. (Wright) and has the following <br /> comments. <br /> The Addendum provides the following information to supplement the Closure Summary Report: <br /> 1. A calculation of contaminant mass remaining in both soil and groundwater at the site. <br /> 2. Clarification of contaminant concentrations in MW-3. <br /> 3. Clarification of the locations of domestic.wells noted in the 2,000-foot radius well survey. <br /> 4. Clarification of the groundwater flow direction. <br /> The Addendum did not provide an evaluation of the potential threat of vapor intrusion from the <br /> remaining contamination. Site closure cannot be considered until this issue is addressed. If your <br /> consultant considers not enough data is available to make a technical evaluation of the threat of <br /> vapor intrusion from the remaining contamination, please prepare and submit a work plan to <br /> obtain the necessary data. The technically justified evaluation, or work plan, is due for submittal <br /> to the EHD no later than January 28, 2011. <br /> If you have any questions please contact Lori Duncan at (209) 468-0337. <br /> Sincerely, <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 Drive, #200, Rancho Cordova CA 95670 <br /> John Lynch, Wright Environmental, 2395 East Pescadero Avenue, Tracy CA 95304 <br />