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t;1( <br /> j 1ATHROP PROPERTY <br /> WKA No. 1184,02 <br /> January 30, 1992 <br /> > Page 1 i <br /> on September 7. 1991, 'to San Joaquin County Monument U-33.5, which is located <br /> approximately 60-feet westerly from the southwesterly corner of the subject property. Mr. <br /> Lopes` report has been included in its entirety as Appendix D. <br /> Well Water Elevation Measurements and Sampling i <br /> Ms. Ratliff verbally requested that four consecutive months of ground water level <br /> measurements be made in each of the three monitoring wells on the property. Additionally, <br /> we were to perform two quarterly sampling events of the on-site well.3. The wall water was <br /> r. to be analyzed for TPH and BTX&E; the water obtained at the initial sampling event was also k <br /> k to be analyzed for lead. <br /> n We performed the requested measurement, sampling and analysis activities. The initial <br /> measurement and sampling event occurred September 9, 1991 and was observed by Ms. <br /> Meays. Water level measurements were made October 11 and November 19, 1991. The <br /> final measurement/sampling event occurred December 9, 1991. Water level measurements <br /> were made with a Solinst electronic well sounder. When sampling occurred, water level <br /> a <br /> measurements were made before and after sampling. <br /> The wells were sampled in accordance with the California Department of Health th Services Draft <br /> Scientific and Technical Standards for Hazardous Waste Sites. Three to five <br /> well volumes of <br /> water (for the subject property, this was calculated to be at least 18 gallons per well) were <br /> purged from the well and containerized until completion of laboratory analysis. <br /> F <br /> Parameters of well water temperature, conductivity and pH were measured during purging. <br /> Curing the initial sampling event, purging was accomplished with aself-contained, Honda <br /> centrifugal pump; a Grundfos two-inch-diameter stain!ess steel submersible pump attached <br /> to a portable electrical generator was utilized during the final sampling event. The wells did <br /> not purge to dryness and drawdown was observed to be minimal; this is likely attributable to <br /> the highly permeable sands in ;which the wells are screened. The water samples were <br /> retrieved with single-usage polyethylene bailers. <br /> Review of the ground water analytical results reveals non-detectable concentrations of TRH <br /> and BTX&E in the initial and final(second quarter)samples. The samples from the initial event <br /> WALLACE•KUHL <br /> r,ASSOCIAT F,INC. . <br />