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rr:Y�/j•/�jf/!Illff�lrrr' <br /> i <br /> ZZSMAALM' <br /> rrr <br /> Working to Restore Nature <br /> 1710 Main Street <br /> Escalon, CA 95320 MAY 6 '-92 <br /> Phone: (209)838-3507 <br /> FAX: (209)838-3509 <br /> PE RINI'T `�''' r'° April 30, 1992 <br /> Ms. Diane Hinson <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: 1992 Second Quarter Groundwater Monitoring Report, Genstar Western Stone <br /> site, 8181 W. Business Loop 205, Tracy, CA (county site code: 1393) <br /> Dear Ms. Hinson: a <br /> -rte• <br /> This letter presents the results of RESNA's 1992 second quarter groundwater monitoring and <br /> sampling at the referenced site (Figure 1). Activities included monitoring depth to groundwater, <br /> purging of wells, groundwater sampling, and analysis of samples for total petroleum <br /> hydrocarbons as diesel (TPHD), benzene, toluene, ethylbenzene, and xylenes (BTEX). <br /> Groundwater monitoring and sampling was conducted on April 7, 1992. Depth to groundwater <br /> was measured in each well and subtracted from wellhead elevation to determine groundwater <br /> elevation (Table 1). Water levels in April were found to have remained essentially unchanged <br /> since last measured in January 1992. Figure 2 depicts the groundwater gradient on April 7, <br /> 1992. Gradient magnitude was slightly changed since January 1992, at approximately .0047 ft/ft <br /> or 25 ft/mile in a north-northwesterly direction. <br /> Water samples were collected from each well on April 7, 1992, after purging and stabilization <br /> of pH, conductivity, and temperature. Ms. Mary Meays of the San Joaquin County Public <br /> Health Services was present to witness the sampling. Disposable bailers were used to collect <br /> the samples. <br /> The samples were collected, preserved and transported under chain of custody and in accordance <br /> with EPA and DHS protocol. The samples were analyzed by RESNA Environmental <br /> Laboratories (DHS cert. #1211) for TPHD and BTEX utilizing EPA methods 3510/8015 and <br /> 8020, respectively. Table 2 summarizes analytical results. Attachment 1 contains laboratory <br /> data sheets, chain-of-custody documentation, and well purge logs. <br /> L12050592.GPS <br />