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k" KLEINFELDER <br /> Based upon analytical data obtained during these sampling events, the CVRWQCB and EHD <br /> requested continued quarterly groundwater sampling, and preparation of a workplan to address the <br />' extent of the contamination in the vicinity of the subject site, including a sensitive receptor survey <br /> and estimates as to the amount of contamuiation in soil and groundwater <br />' At the request of General Mills, Kleinfelder installed three additional monitoring wells in the <br /> vicinity of the UST in January 2002 (MW2, MW-3 and MW4) During the installation, soil <br />' samples were collected from the borings and submitted for laboratory analysis None of these <br /> samples contained detectable concentrations of TPH-G, TPH-D, nor BTEX, at or above laboratory <br /> reporting limits <br />' Four quarterly sampling events were conducted in 2002 with groundwater samples collected from <br /> all four monitoring wells MW-1 through MW-4 Monitoring wells MW-2, MW-3 and MW-4 were <br />' installed as perimeter monitoring wells MW-2 and MW-3 were installed downgradient of the UST <br /> area and MW-1 was installed upgradient of the UST area Based on findings of the four quarterly <br /> sampling events conducted during 2002, fael constituents continued to be present in MW-1 <br />' including TPH-D, TPH-G, ethylbenzene and total xylenes at relatively lower concentrations (See <br /> Table 2) Floating product was noted in September 2002 in monitoring well MW-1 Product <br /> thickness since this time has been noted in MW-1 at thicknesses ranging from a film (<0 1 feet) to <br />' approximately 4 inches A trace concentration of TPH-D (0 076 mg/1) was detected in the June <br /> 2002 sampling event in downgradient well MW-2 No petroleum constituents were otherwise <br /> detected in perimeter monitoring wells MWs 2, 3 or 4 in 2002 <br /> Dunng the quarterly sampling events in 2003 petroleum constituents were detected only in MW-1 <br /> Product was measured in MW-1 in consecutive quarterly events in 2003, beginning with the 0 <br />' quarter 2003 at 4, %2, 3/4 and '/4 inches, respectively TPH-D ranged from 13 to 32 mg/l in MW-1 <br /> during 2003 Approximately t/z inch of product was measured during the lst quarter 2004 sampling <br />' event with TPH-D detected at 550 mg/1 No requested petroleum constituents were detected in <br /> MWs 2, 3 or 4 during the 1St quarter 2004 sampling event <br />' The following Sections document Kleinfelder's findings from the third quarter 2004 sampling <br /> event <br /> 28209 T03/ST04RI402/ISH lv Page 5 of l I <br /> 0 2004,Kleinfelder, Inc October 20,2004 <br />