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IASI <br /> INDUSTRIES <br /> V�,ATERWORK CORP. <br /> SIt�F.RIES S <br /> April 26, 1991 a <br /> rd 'V fix" <br /> MAY 6 tfi1 <br /> ENVIR0'���NI'l"TFA HEALTH 3, <br /> Ms. Laurie A. Cotulla PER10I i/SFI-VIC1S <br /> San Joaquin County Public Health Services, <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: 1991 Second <br /> Quarter Groundwater Monitoring <br /> Report <br /> Genstar Western Stone site, 8181 E. Eleventh St. , , <br /> Tracy, CA (county site code: 1393) <br /> Dear Ms. Cotulla: <br /> This letter presents the results of our 1991 second 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 <br /> Ef;.=.. ethylbenzene, and xylenes (HTEX) . <br /> f' Groundwater monitoring and sampling was conducted on April 8, <br /> 1991. Depth to groundwater was measured in each well and sub- <br /> tracted from wellhead elevation to determine groundwater eleva- <br /> tion (Table 1) . Water levels in April were found to be essen- <br /> tially the same as when last measured in January 1991. Figure 2 ` <br /> depicts the groundwat,ar gradient on April 8, 1991. Gradient <br /> magnitude was essentially unchanged since January 1991, at ap- <br /> proximately 005t/ft or 25 ft/mile. Crour�d�aater flow direction <br /> wasiaharagd acrid re:nans norttwese .y. <br /> Water samples were collected from each well on April 8, 1991, <br /> after purging and stabilization of pH, conductivity, and tempera- <br /> ture. The sampl•_s were analyzed by Applied Analytical P Y Laborato- <br /> ries (DHS cert. #1211 ) for TPHD and HTEX utilizing EPA methods <br /> 8015 and 8020, respectively. Table 2 summarizes analytical ' <br /> results. Attachment chment 1 contains laboratory data sheets, chair:-of- <br /> custody documentation, and well purge logs. <br /> The water sample collected from MW4 was found to contain 1 . 1 <br /> parts per billion (ppb) ethylbenzene. Benzene, toluene, xylenes, <br /> and TPHD were not detected in this sample. No detectable concen- <br /> trations of any analytes were found in the remaining samples. <br /> a' 17I0 MAIN STREET w ESCALON,CA 95320 a (209)838-3507 <br /> 2350-A WALSH AVENUE a SANTA CLARA,CA 95051 • (408)496-1249 <br /> f <br /> 9: <br />