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S►NA WATERWORK CORP. <br /> INDUSTRIES <br /> July 31, 1991 � �� � ��,� • <br /> AUG <br /> ',"IVIRONMEN- ,I <br /> ti <br /> Ms. ,Laurie A. Cotulla A ERlv�lIz;,� E:ALrty Health Services ,;tiY <br /> u�_ <br /> San Joaquin County Public H e <br /> Environmental Health Division ' <br /> P.O. Box 2009 <br /> 3 <br /> Stockton, CA 95201 <br /> "r <br /> • a <br /> Re: 1991 Third Quarter Groundwater Monitoring Report, Genstar <br /> Western Stone site, 8181 E. 11th St. , Tracy, CA (county a <br /> site code: 1393) <br /> ii <br /> K <br /> { <br /> Dear Ms. Cotulla: <br /> This letter presents the results of our 1991 third quarter <br /> groundwater Monitoring and sampling at the referenced site. <br /> Activities during the quarter included monitoring depth to <br /> _ = groundwater, purging of wells, groundwater sampling, and analysis <br /> of samples for total petroleum hydrocarbons as diesel (TPHD), <br /> benzene, toluene, ethylbenzene, and xylenes (BTEX) . <br /> Gro mdwater. monitoring and sampling was csondtxated on July 1, 1991.. <br /> Depth"to groundwater was measured in each well and subtracted from <br /> wellhead elevation to determine groundwater elevation (Table 1) . <br /> Wat 1evel4.1 in ,July dere foundto have risen appr6ki'Matel:y 2 feet <br /> cQmPa�aei to when last measiiec snlgsl "19.91. Figure 2 depicts the <br /> groundwater gradient on July 1, 1991. Gradient magnitude was <br /> slightly changed since April 1991, at approximately 0.0022 ft/ft or <br /> 11 ft/mile. Groundwater flow direction was unchanged and remains <br /> northwesterly. Z. <br /> Water samples were collected from each well on July 1, 1991, after <br /> purging and stabilization of pH, conductivity, and temperature. <br /> The samples were analyzed by Applied Analytical Laboratories (DHS <br /> cert. ##1211) for TPHD and BTEX utilizing EPA methods 8015 and 8020, <br /> respectively. Table 2 summarizes analytical results. Attachment <br /> 1 contains laboratory data sheets, chain-of-custody documentation, <br /> and well purge logs. <br /> The water samples collected from wells MW1, MW2, MW3, and MW4 were <br /> not found to contain detectable concentrations of any petroleum <br /> hydrocarbon analytes, <br /> WSTLR729.WP <br /> i <br /> 1710 MAIN STREET • ESCALON,CA 95320 . (209) 838-31507 <br /> 2350-A WALSH AVENUE 9 SANTA CLARA,CA 95051 • (408)496-1249 <br />