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83 WEST MARCH LANE <br /> SUITE 12 May 3 , 1990 <br /> STOCKTON,CA 95207 <br /> W2] PHONE:(209J 476-1635 <br /> MANAGERS WWMIOMULTANTS <br /> Mr. Greg Lyon <br /> San Joaquin County Public Health services <br /> Environmental Health Division <br /> P.O. Sox 2009 <br /> 1601 East Hazelton Ave. <br /> Stockton, CA 95201 <br /> Dear Mr. Lyon, <br /> Please find enclosed the analytical results for the initial <br /> groundwater sample collected from the monitoring well located at <br /> 100 W. Valpico Road in Tracy, California. As can be seen by <br /> reviewing these results, no total petroleum hydrocarbon compounds <br /> were detected. The only compounds detected were toluene and xylene <br /> at concentrations of 0. 87 ug/L and 0.97 ug/L respectively. These <br /> concentrates are several orders of magnitude lower than the <br /> published water quality goals of 100 ug/L for toluene (DHS action <br /> level) and 1750 ug/L for xylene (State MCL) . <br /> Therefore, based on these results, the results of the soil samples <br /> collected during the borehole installation in January 1990 and per <br /> our previous conversations, WESTON is requesting that we be allowed <br /> to land applicate the containerized well and boring installation <br /> cuttings and well development water in the open area directly south <br /> of the buildings. Since we will be on-site with a backhoe on <br /> Friday, May 4, 1990, I would like to request that we be provided a <br /> response prior to demobilizing the backhoe. <br /> I appreciate any effort you may be able to make to expedite this <br /> request and should you have any questions regarding this matter, <br /> please do not hesitate to call me. <br /> Sincerely, <br /> ROY F. WESTON, INC. <br /> Erik A. Friedrich, R.E.A. , R.E.P. <br /> Project Manager <br /> EAF/cmc <br /> Enclosure RECEIVED <br /> MAY 4 99°0 <br /> ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br />