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- r <br /> I <br /> RESNA WATERWORK CORP. <br /> INDUSTRIES <br /> i <br /> July 31, 1991 <br /> AUG <br /> ENV1RONMF. <br /> Ms. Laurie A. Cotulla PERM/7 <br /> San Joaquin County Public Health Services, �""'`'� . ; <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: 1991 Third Quarter Groundwater Monitoring Report, Genstar <br /> Western Stone site, 8181 E. 11th St. , Tracy, CA (county <br /> site code: 1393) <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 /> ` r--i <br /> _ 9roundwater, purging of wells groundwater sampling, and analysis <br /> of samples for total petroleum hydrocarbons as diesel (TPHD) , <br /> benzene, tolia ...�:, ethylbenzene, and xylenes (BTEX) . <br /> Groundwa;C Moni ttrr, ng,.,aaad ;sampling was conducted on July 1, 199.1. <br /> I f n <br /> DepYi to 9roun4water was measured in each well and subtracted from <br /> wellhead elevation to determine groundwater elevation (Table 1) . <br /> TtlQt� 3 Juj dere foundo„hate frisan :approximately 2 feet <br /> ooezl tcsr lteuedn Apx*i 1q1 ` Figure 2 depicts the <br /> groundwater gradient an July 1, 1991. Gradient magnitude was <br /> sIi htl chap ed since April 1991, at approxima-'k.ely 0.0022 ft/ft or <br /> 9 Y g <br /> 11 ft/mile. Groundwater flow direction was unchanged and remains <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 ksraf�les collected from-wells MW1, MW2, MW3, and MW4 were <br /> rYbourido r Cort an detectable 'concentrations of any petroleum <br /> hy�Q'��rbcirt �rialyt+�s.:' <br /> WSTLR729.WP <br /> 1710 MAIN STREET . ESCALON,CA 95320 • (209)838-3507 <br /> 2350-A WALSH AVENUE • SANTA CLARA,CA 95051 (408)496-1249 <br /> I <br />