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i <br /> Working To Restore Nature <br /> 1710 Main Street RECENED <br /> Escalon, CA 95320 MAY 18 1993 <br /> Phone: (209) 838-3507 ENVIRONMENTAL. HEALTH <br /> FAX: (209) 838-3509 pERMIPSERVICES May 17, 1993 <br /> 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 Second Quarter 1993 monitoring and sampling activities at the <br /> above referenced site (Figure 1). Activities included measuring the depth to water in wells <br /> MW1, MW2 and MW3, purging and sampling well MW3, and on-site disposal of remediated <br /> groundwater. <br /> Groundwater monitoring and sampling was conducted on April 19, 1993. Depth to groundwater <br /> measured in wells MW1, MW2, and MW3 was subtracted from wellhead elevation to determine <br /> groundwater elevation (Table 1). Water levels on April 19, 1993 had dropped an average of <br /> 0.96 feet since last measured in January 1993. Figure 2 depicts the groundwater gradient on <br /> April 19, 1993. Gradient magnitude was approximately 0.004 ft/ft or 21 ft/mile in a north- <br /> northwesterly direction. Monitoring data is presented in Attachment 1. <br /> On April 19, 1993, after purging and stabilization of pH, conductivity, and temperature a <br /> groundwater sample was collected from downgradient well MW3. A disposable bailer was used <br /> to collect the sample. The well purge log is included in Attachment 1. <br /> The groundwater sample was delivered to State-certified RESNA Environmental Laboratories <br /> and analyzed for total petroleum hydrocarbons as diesel (TPHD) and benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX) utilizing EPA methods 3510/8015 and 503018020, <br /> respectively. No petroleum analytes were detected in the groundwater sample collected from <br /> well MW3. On May 1, 1993 RESNA Environmental Laboratory (Fremont) was consolidated <br /> with Sequoia Analytical Laboratory. During the move the holding time for the diesel sample <br /> was exceeded by three days. However, based upon the low volatility of diesel, the absence of <br /> 2QR1993.FNL <br />