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San Joaquin County DIRECTOR <br /> Donna Hera RENS <br /> AEnvironmental Health Department�O•_,�•.•cp p SStSTANTDIRECTOR <br /> s:' ? 600 East Main Street Laurie Cotulla,REHS <br /> U. X Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> •' Carl Borgman,REHS <br /> Mike Huggins, REHS,RDI <br /> 4,Ci F o•a�'�P Website: www.sjgov.org/ehd Margaret Lagorio,REHS <br /> Phone: (209)468-3420 Robert McClellon,REHS <br /> Fax: (209)464-0138 Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> Terrence Fox <br /> Cal Trans District 6 <br /> 2015 East Shields Avenue, Suite 100 date stamped 4/24/08 <br /> Fresno CA 93726 <br /> Subject: Stockton Yard Maintenance Station Site Code: 10193 <br /> 1604 B Street <br /> Stockton CA 95201 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Groundwater Monitoring Report— Fourth Quarter 2007 (Report) dated February 13, 2008 <br /> submitted on your behalf by Geocon Consultants, Inc. (Geocon) and has the following <br /> comments. <br /> The Report documents routine quarterly groundwater monitoring and sampling activities <br /> conducted at this site in January 2008. In the Report, Geocon recommends either a <br /> change in the monitoring frequency of three of the onsite groundwater monitoring wells, <br /> MW-7, MW-8 and MW-9, or that the wells be destroyed. This recommendation is based <br /> on the absence of reported detections of contamination in the samples from these wells. <br /> The EHD agrees that the subject wells do not need to be sampled on a quarterly basis <br /> and approves conducting annual sampling. The wells should continue to be monitored <br /> quarterly for depth to groundwater for use in groundwater elevation and flow direction <br /> calculations. The EHD does not approve the destruction of the wells at this time. In <br /> correspondence dated June 3, 2002, the EHD directed submittal of a site conceptual <br /> model (SCM) for this site including maps and cross-sections depicting the site geology <br /> and plume, and a revised calculation of contaminant mass remaining at the site. Please <br /> proceed with preparation of a SCM for this site and submit it to EHD by August 1, 2008. <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Sincerely, COPT <br /> FILE <br /> Lori Duncan, Senior REHS Nuel C. Henderson, Jr., PG <br /> Registered Environmental Health Specialist Engineering Geologist <br /> c: James Barton, CVRWQCB, 11020 Sun Center Drive #200, Rancho Cordova 95670 <br /> Rebecca Silva, Geocon, 3160 Gold Valley Drive#800, Rancho Cordova CA 95742 <br />