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San Joaquin County DIRECTOR <br /> Environmental Health a rtment <br /> Donna Heran, REHS <br /> �0 CO a <br /> p ASSISTANT DIRECTOR <br /> 2 Z 600 East Main Street Laurie Cotulla,REHS <br /> { Stockton, California 95202-3029 <br /> PROGRAM COORDINATORS <br /> s <br /> •.tg • <br /> Carl Borgman, REHS <br /> Mike Huggins,REHS, RDI <br /> Website: www. ov.or ehd <br /> s fg Margaret Lagorio, REHS <br /> Phone: (209)468-3420 Robert McClellon, REHS <br /> Fax: (209)464-0138 Jeff Carruesco,REHS,RDI �P <br /> Kasey Foley, REHS <br /> June 23, 200 <br /> Mrs. Helen Higgins <br /> 2100 Promontory Point Lane <br /> Rancho Cordova CA 95670-7269 <br /> Subject: Vogue Cleaners Site Code: 231032 <br /> 2315 N. California St, RO#: 607 <br /> Stockton, CA 95204 SWRCB-CUF#: 011775 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Work <br /> Plan for MW-90D and MW-99S (Plan) and the State Water Resources Control Board's <br /> (SWRCB) Preliminary 5-Year Review Summary Report (Summary) dated May 12, 2008 <br /> has the following comments. <br /> The Summary evaluated this site's progress from he underground storage tank (UST) <br /> removals in 1996 up to and including the data for monitoring wells MW-1 thru 9d. The <br /> information in the Summary concluded the extent of ground wafer contamination is <br /> defined but the EHD can not agree with this conclu ion. <br /> The EHD has discussed the status of the extent of the ground water contamination with <br /> your consultant, Michael Vlach of Foothill Engineering and has agreed that further <br /> investigation is needed to define the horizontal (lateral) extents of the 1,2-dichloroethane <br /> (DCA) plume in the shallow and deeper zones o fsite. The Plan submitted recently <br /> addresses this concern by proposing the installations of MW-10D and MW-11S offsite. <br /> The Plan is adequate and necessary [H&S Code 25296.10(c)(3)] and approved. <br /> The EHD also reviewed First Quarter 2008 Monitoring (Report) dated May 30, 2008. <br /> This Report covered the ground water sampling event held on March 25, 2008. <br /> Conclusions included in the Report stated that although the dissolved benzene <br /> concentrations in the ground water show a decreasing trend, the DCA continues to <br /> remain at elevated levels in the peripheral monitoring wells, MW-7, -8, and -9. <br /> The Report included recommendations that two ground water extraction wells should be <br /> installed in the sidewalk adjacent to site, near the existing MW-5 cluster for migration <br /> control of the DCA in the shallow and deep zones. Additionally, the Report requested <br /> that quarterly ground water monitoring and report ng revert back to semi-annual and <br /> start with skipping the second quarter 2008. <br />