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A WATERWORK CORP. <br /> - - - <br /> ` AN <br /> A USNA Comparry Now <br /> Environmental Solutions <br /> Through Applied Science, <br /> Engineering&Construction <br /> 1710 Main 5treei <br /> Escalon, CA 95320 <br /> Pbone: (209) 838-3507 November 8, 1991 <br /> Fax: (209) 838-3504 <br /> Ms. Laurie A. Cotulla <br /> San Joaquin County Public Health Services' <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: 1991 Fourth Quarter Groundwater Monitoring Report, Genstar Western Stone <br /> site, 8181 E. 11th St., Tracy, CA (county site code: 1393) <br /> Dear Ms. Cotulla: <br /> This letter presents the results of RESNAIWaterWork Corp.'s 1991 fourth quarter groundwater <br /> E monitoring and sampling at the referenced site. Activities during the quarter included <br /> monitoring depth to groundwater, purging of wells, groundwater sampling, and analysis of <br /> samples for total petroleum hydrocarbons as diesel (TPHD),benzene, toluene,ethylbenzene, and <br /> xylenes (BTEX). <br /> r Groundwater monitoring and sampling was conducted on October 7, 1991. Depth to <br /> groundwater was measured in each well and subtracted from wellhead elevation to determine <br /> groundwater elevation (Table 1). Water levels in October were found to have decreased <br /> approximately 1.75 feet since last measured in July 1991. Figure 2 depicts the groundwater <br /> gradient on October 7, 1991. <br /> Gradient magnitude and groundwater flow direction were slightly changed since-July 1991, at <br /> approxurlat�ly OrggQ Uff,-ftb 2l`fthhile`in.a north-northr e'sferl di3�etion. <br /> Water samples were collected from each well on October 7, 1991, after purging and stabilization <br /> of vH, conductivity, and temperature. Mary Meays of the San Joaquin County Public Health <br /> Department was present to witness the sampling. <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 Applied Analytical Laboratories <br /> (DHS cert. #1211) for TPHD and BTEX utilizing EPA methods 3510/8015 and 8020, <br /> respectively. Table 2 summarizes analytical results. Attachment 1 contains laboratory data <br /> sheets, chain-of-custody documentation, and well purge logs. <br /> T% pQlected �fFom wells MW1, IW�W2, Ml`x3,_and MW4 were not found to <br /> conetabY� ecef3tito)s.of any pexolGuifi`hydrolraYbon 'analytes: Monitoring results <br /> sui <br /> f <br /> stantiate our recommendation for case closure <br /> WSTI023.WP <br />