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1 LATHROP PROPERTY <br /> % WKA No. 1184.02 <br /> F January 30, 1992 <br /> Page 11 <br />,m- <br /> i- <br /> i. <br /> on September 7, 1991 , to San Joaquin County Monument U-33.5, which is located <br /> approximately 60-fest 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 <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 wells. The well water was <br /> to be analyzed for TPH and BTX&E; the water obtained at the initial sampling event was also <br /> to be analyzed for lead. <br /> 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 /> I 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 /> measurements were made before and after sampling. <br /> i <br /> The wells were sampled in accordance with the California Department of Health Services Draft <br /> i Scientific and Technical Standards for Hazardous Waste Sites. Three to five well-volumes of <br />= water (for the subject property, this was calculated to be at least 18 gallons per welly were <br /> purged from the well and containerized until completion of laboratory .analysis. <br /> r' <br /> Parameters of well water temperature, conductivity and pH were measured during purging. <br /> During the initial sampling event, purging was accomplished with a self-contained, Honda <br /> centrifugal pump; a Grundfos two-inch-diameter stainless 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 TPH <br /> and BTX&E in the initial and final (second quarter) samples. The samples from the initial event <br /> f <br /> W%17 <br /> WALLACE•KUHL <br /> FZASSOCIAT€S INC <br />