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E. iii <br /> t November 2 1987 <br /> xr <br /> h mow: <br /> Ms. Kellie Reichenberg . <br /> REYNOLDS AND BROWN <br /> 6601 Owens Drive . <br /> Pleasanton, CA 94566 <br /> Subject: ' Groundwater_ Quality Evaluation at Property . <br /> Located at 72.4 Grant Line Road, Tracy, CA. f <br /> Dear Ms. Reichenberg: <br /> In accordance With.-your request, Aqua Terra <br /> Technologies, Inc. has evaluated groundwater quality at <br /> property located. at 7-24 Grant Line Road, Tracy, <br /> California, hereafter referred to as the Tracy property.. <br /> Our groundwater quality evaluation was based on. review <br /> Aqua Terra Technologies of the Kennedy/Jenks/Chilton' Engineers report, dated <br /> Consulting Engineers January 26., :1987 ; the Applied Geosystems report, dated" <br /> &Scientists August 26, 1987 ; •and our site Visit, -sampling, and <br /> Analysis of groundwater for suspected contaminants. <br /> 2950 Buskirk Avenue Kennedy/Jenks/Chilton Investigation <br /> Suite 120 - <br /> Walnut Creek, CA Kennedy/Jenks/Chilton (KJC) conducted an-assessment of <br /> 94.596 two underground fuel storage tanks located at the Tracy - <br /> 415934-4884 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 constructed <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 /> i <br />