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Working To Restore Nature <br /> 1710 Main Street MAR 16 1993 <br /> Escalon, CA 95320 ENVIRONMENTAi-e HWAILTH <br /> Phone: (209) 838-3507 PERMIT/SERVICE <br /> FAX: (209) 838-3509 March i2, 1993 <br /> 4 Ms. Mary Meays <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> RE: Genstar/Western Stone Products, 8181 West Eleventh Street, Tracy, CA <br /> Dear Ms. Meays; <br /> This letter presents the results of the First Quarter 1993 monitoring at the above referenced site <br /> and a response to correspondence from San Joaquin County Public Health Services, <br /> = r Environmental Health Division (PHS/EHD) dated December 9, 1993 (received via facsimile <br /> 1111193). <br /> Quarterly monitoring activities included measurement of the depth to water in wells MW1, MW2 <br /> and MW3 and the purging and sampling of well MW3. Additionally, water samples were <br /> collected from the Baker Tank to gauge the success of bioremediation. <br /> QUARTERLY GROUNDWATER MONITORING AND SAMPLING <br /> Groundwater monitoring and sampling was conducted on January 26, 1993. Monitoring wells <br /> MW1, MW2, and MW3 were monitored for depth to groundwater, and the downgradient well <br /> MW3 was purged and sampled. <br /> Depth to groundwater measured in wells MW1, MW2, and MW3 was subtracted from wellhead <br /> elevation to determine groundwater elevation (Table 1). Water levels on January 26, 1993 had <br /> risen approximately 1.8 feet since last measured in October 1992. Figure 2 depicts the <br /> groundwater gradient on January 26, 1993. Gradient magnitude was approximately 0.004 ft/ft <br /> or 21 ft/mile in a north-northwesterly direction. Monitoring data is presented in Attachment 1. <br /> On January 26, 1993, after purging and stabilization of pH, conductivity, and temperature a <br /> groundwater sample was collected from downgradient well MW3. An additional sample was <br /> 1 Q MR l 993.FNL <br />