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PUBLf: HEALTH SEAICES <br /> SAN �OAQCIN COOT}, <br /> m: <br /> J. . <br /> JOGI KHANNA ,\LD.MT fi ;:, I <br /> Heiilrh Officer �P <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, Califomia 95201 eq ciF6a�\ <br /> (209) 468-3400 <br /> AUG 2 8 1991 l� <br /> JEFF WERNER <br /> GEWEKE PROPERTIES <br /> 1045 S CHEROKEE LANE <br /> LODI CA 95241 <br /> RE: Geweke Car Capitol IN REPLY REFER TO SITE CODE: 2065 <br /> 16 S. Cherokee <br /> Lodi, CA 95241 <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) and the California Regional Water Quality <br /> Control Board (CVRWQCB) have reviewed the July 31, 1991 Problem <br /> Assessment Report for the above referenced site. In May 1991, four <br /> additional monitoring wells and one extraction well were installed. <br /> Your consultant, PES Environmental, Inc. proposes to remediate <br /> contaminated groundwater via an extraction system. Disposal of <br /> treated groundwater is still being considered. Reinjection of <br /> treated groundwater is a viable alternative and should be <br /> considered with the other possible disposal methodologies. <br /> On June 5, 1991, an aquifer test was conducted on the extraction <br /> well, EW-1. The well was pumped for 168 minutes at flow rates <br /> ranging from 0. 0 - 3 . 1 gallons per minute. The data were plotted <br /> to facilitate calculation of aquifer properties. The calculations <br /> used to determine the radius of influence were not included in the <br /> PAR. In addition, 168 minutes is usually an insufficient length of <br /> time to measure aquifer properties. Further tests should be <br /> conducted to more completely define these properties (ie, <br /> transmissivity, capture radius, hydraulic conductivity, hydraulic <br /> gradient, etc. ) . <br /> In addition to groundwater remediation, a soil remediation plan <br /> should be proposed. Soil contamination has been detected as deep <br /> as 50 feet below ground surface and should be removed so as not to <br /> impact the groundwater further. Vapor extraction has been shown to <br /> greatly reduce concentrations of petroleum hydrocarbon <br /> contamination from the vadose zone and the capillary fringe. You <br /> should consider vapor extraction as well as other means of soil <br /> remediation. <br /> A Division of Jan Joaquin County Health Cure Services �, <br />