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—� <br /> CIayton <br /> Eh'VI$O\IThNiSM1IENihL <br /> CQNSU <br /> a R � <br /> Clayton Environmental Consultants, Inc. was retained by Orchard Supply Hardware <br /> (OSH) to install one monitoring well to sample and analyze soil and groundwater at <br /> } -1 the northeast corner of MacArthur Drive and Grant Line Road in Tracy, California <br /> 1 (Figure 1). Mr. Michael D. La Tourette authorized this project on November 29, <br /> 1990, by accepting Clayton's Proposal No. 90-B-281 and its accompanying terms and <br /> conditions. <br /> The following tasks were performed at the property site: <br /> 1 <br /> ( ) Installed groundwater monitoring well, MW-3B, sampled and analyzed soil and <br /> p groundwater <br /> (2) Proper abandonment of monitoring well MW-3 <br /> (.3) Proper abandonment of a domestic water well <br /> J (4) Quarterly sampling all monitoring wells on <br /> Based on the results of the work outlined above, we make the <br /> and recommendations: following conclusions <br /> • Concentrations of hydrocarbons in the water samples collected from MW-1, MW-2 <br /> and MW-3B were below detection levels. <br /> • The newly`installed monitoring well MW-3B deteotal rec <br /> cted 770 m <br /> hydrocarbons in soils at 4 feet:bgs,and 20 mg/kg at 9 feet. ��ted shallow soloverable <br /> boring program to define the horizontal and vertical extent of contamination may <br /> be required by the SJ CPHS along the abandoned leach line. . <br /> Although the sail sample from MW-3B @ 4 feet exceeds the LUFI'manual <br /> r guidelines for petroleum hydrocarbon contamination:of shallow soils; concentrations <br /> of hydrocarbons in the water samples collected from MW-3B are below detection <br /> r' levels. Clayton recommends that semiarLaual groundwater monitoring of monitoring <br /> ` .`. well MW-3B be conducted at the site for one-year to monitor any changes. <br /> R <br /> { 1 <br /> r <br /> r <br /> Y r A <br />