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%use �..� <br /> r <br /> November 2 , 1987 <br /> ' r - <br /> i <br /> Ms. Kellie Reichenberg <br /> REYNOLDS AND BROV►TN <br /> 6601 Owens Drive <br /> Pleasanton, CA 94566 <br /> Subject: Groundwater Quality Evaluation at Property <br /> Located at 724 Grant Line Road, Tracy, CA. <br /> Dear Ms_ Reichenberg: <br /> In accordance with your request, Aqua Terra <br /> Technologies, Inc. has evaluated groundwater quality at <br /> property located at 724 Grant Line Road, Tracy, <br /> California, hereafter referred to as the Tracy property_ <br /> Our groundwater quality evaluation was based on review <br /> qua Terra Technologies of the Kennedy/Jenks/Chilton Engineers report, dated <br /> an-ulting £npneers January 26, 1987 ; the Applied Geosystems report, dated <br /> �cirntiSLE - August 26, 1987 ; and our site visit, sampling, and <br /> analysis of groundwater for suspected contaminants. <br /> 930 Buskin A%rnue Kennedy/Jenks/Chilton Investigation <br /> Brite 120 <br /> shut Creel. Ga Kennedy/Jenks/Chilton (KJC) conducted an assessment of <br /> 4596 two underground fuel storage tanks located at the Tracy <br /> 15934-4884 property. The KJC study was comprised of locating the <br /> tanks using- ground penetrating radar, sampling and <br /> analysis of three soil borings, and construction and <br /> sampling of one monitoring well located down gradient to <br /> the fuel tanks. Soil and groundwater samples were <br /> collected and analyzed according to approved methodology <br /> established by the California Department of Health <br /> Services (DHS) . The monitoring well was--j,-onstructed <br /> according to procedures established by the State Water <br /> Resources Control Board and the DHS in the Site <br /> Mitigation Decision Tree (May, 1986) . Results of the - <br /> KJC study indicated 13-43 ppb (ug/Kg) of toluene in soil <br /> and no detectable levels of benzene, toluene, or xylene <br /> in groundwater at detection levels down to <1 ug/L. The <br /> Environmental Protection Agency's (EPA) Practical <br /> Quantification Limits (PQL) of benzene, toluene, and <br /> xylene is 2, 2, and 5 ug/L respectively. ;Appendix IX; <br /> 52 FR 25946, July 9, 1987) . <br /> EPA has defined the PQLs, "as the lowest -concentrations <br /> of analyses in groundwater that can be reliably <br /> determined within specified limits of precision and <br /> accuracy by the indicated methods under routine <br /> laboratory operating conditions . " <br />