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1 <br /> KLEINFELDER <br />' was analyzed for the first time in January 2001 was detected in the groundwater sample collected <br /> • yz ary <br />' from MW-1 at 3 3 mg/1 <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 contamination 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 bonngs 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 downgradaent 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, fuel 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 /> Mapproximately 4 inches A trace concentration of TPH-D (0 076 mg/1) was detected in the June <br /> 2002 sampling event in downgradaent well MW-2 No petroleum constituents were otherwise <br /> detected in perimeter monitoring wells MWs 2, 3 or 4 in 2002 <br /> During 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 1$t <br /> quarter 2003 at 4, %Z, 3/4 and '/a inches, respectively TPH-D ranged from 13 to 32 mg/1 in MW-1 <br /> during 2003 Approximately %2 inch and 1/5 inch of product was measured during the 1St and 3rd <br />' quarter 2004 sampling events with TPH-D detected at 550 mg/l and 24 mg/l, respectively No <br /> requested petroleum constituents were detected in MWs 2, 3 or 4 during the 1" or 3rd quarter 2004 <br /> sampling events <br /> The following Sections document Kleinfelder's findings from the fourth quarter 2004 sampling <br /> event <br /> 28209 T03/STO5R277/DH Iv Page 5 of i 1 <br />' C 2005, Kleinfelder, Inc March 10, 2005 <br />