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San Joaquin County DIRECTOR <br /> Environmental Health Department Donna Her an, REHS <br /> ASSISTANT DIRECTOR <br /> a i 600 East Main Street Laurie Cotulla, REHS. <br /> y ` Stockton , California 95202-3029 PROGRAM COORDINATORS <br /> • Carl Bergman. REHS <br /> ' '�P Mike Huggins, REHS, RDI <br /> � r F o'R � Website: www.Sjg0Vorg/ehd Margaret Lagorio, REHS <br /> Phone: (209) 468-3420 Robert McClellon, REHS <br /> Fax : (209) 464-0138 ,teff Carruesco, REHS, RDI <br /> Kasey Foley, REHS <br /> VELMA MASTERSON !JUL O 929a <br /> BENETO INC <br /> 4080 SEAPORT BLVD <br /> WEST SACRAMENTO CA 95691 - 3417 <br /> RE: DARPETRO, INC Site Code: 1060 <br /> 749 E CHARTER WAY <br /> STOCKTON, CA 95202 <br /> San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Quarterly Groundwater Monitoring Report October 1, 2006 through December 312007 <br /> (4t' QR 2006), dated 29 January 2007, Investigation Summary Report, Installation of <br /> Deep Monitoring Wells (ISR) dated 15 May 2007, and Quarterly Groundwater <br /> Monitoring Report, January 1, 2007 through March 31, 2007(lst QR 2007) dated 03 <br /> August 2006, all prepared and submitted by Lee & Pierce, Inc. (L&P) on your behalf <br /> None of the reports provide any recommendations for future actions. <br /> The 1st QR 2007 shows declining contaminant concentrations in the recently installed <br /> deep monitoring wells (MW- 1713 and MW- 18C). Continue quarterly monitoring on these <br /> wells to observe the concentration trends over time. If it becomes apparent that all the <br /> observed contaminates in those wells are due to cross contamination or `drag down' <br /> during the well installations, the EHD will consider the vertical delineation of your plume <br /> as adequate at that time. <br /> In the 1st QR 2007 it was stated that the report on the soil vapor extraction (SVE) test was <br /> in preparation. Submit the report to the EHD by 06 August 2007. Also submit by that <br /> date the report onthehistorical SVE operation as has been directed by the EHD several <br /> times previously, <br /> i <br /> i <br /> The EHD has directed you by letters issued in September 2003 and September 2005 to <br /> prepare a feasibility study for interim remediation of impacted groundwater on your site. <br /> i <br /> I <br />