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KLEINFELDIE R <br /> The General Mills facility utilized flus and the previously removed UST for fuels used to run the <br /> turbines in their production process Kleinfelder understands that currently there is only one UST <br /> ' in place and that the UST has been emptied of all contents, a condition required before drilling <br /> could commence <br /> Kleinfelder conducted a soils assessment in the vicinity of the existing UST based upon our <br /> Proposal titled "Revised Proposal, Pre-Abandonment Underground Storage Tank Assessment, <br /> General Mills Facility, 2000 West Turner Road, Lodi, California," dated January 19, 1999 Two <br /> soil borings were advanced west of the existing underground storage tank to a depth of <br /> approximately 25 feet bgs Groundwater was not encountered Soil samples collected from <br /> ' approximate depths of 20 and 25 feet bgs were submitted for analysis from both soil borings <br /> Total petroleum hydrocarbons as referenced to gasoline and diesel (TPH-G and TPH-D) were <br /> detected from both borings from one or more samples collected at depths of 20 to 25 feet bgs <br /> Based upon these results the PHS/EHD requested installation of a single monitoring well <br /> southwest of the existing UST Mr Harkin Knoll of PHS/EHD requested placement of the well, <br /> ' to be southwest of the UST The well location is based on previous assessments at the General <br /> Mills facility, which showed a localized southwest groundwater gradient Based upon PHS/EHD <br /> comments and desires, General Mills retained Kleinfelder to install the monitoring well <br /> ' A single monitoring well (MW-1) was subsequently installed on May 23, 2000 dust southwest of <br /> an existing UST at the subject site During advancement of the soil boring, groundwater was <br /> encountered at approximately 34 feet bgs The monitoring well was advanced vertically to a <br /> depth of approximately 45 feet bgs and screened from 25 to 45 feet <br /> ' Soil samples were collected at 5-foot intervals begmnmg at 5 feet from the ground surface A <br /> _ total of 9 soil samples were collected from boring MW-1 Petroleum-like odors were noted from <br /> soil samples collected at depths ranging from 15 to 40 feet bgs The soil samples submitted for <br /> analyses were collected at approximate depths of 20 and 30 feet bgs A total of 2 soil samples and <br /> a single groundwater sample collected from MW-1 were analyzed for total petroleum <br />' hydrocarbons as referenced to diesel (TPH-D) and benzene, toluene, ethylbenzene, and total <br /> xylenes(BTEX) <br />' Both of the soil samples collected at approximate depths of 20 and 30 feet bgs had reported <br /> concentrations of TPH-D at 3,770 mg/kg and 2,880 mg/kg, respectively (Carbon range C10 to <br /> C16) BTEX constituents were not detected at or above laboratory reporting limits in these two <br />' soil samples The groundwater sample collected from MW-1 had a TPH-D concentration of 46 8 <br /> mg/kg Two BTEX constituents, ethylbenzene and total xylenes were also detected in this <br /> groundwater sample at 4 88 and 4 17 ug/1, respectively <br /> Kleinfelder conducted groundwater sampling for the fourth quarter 2000 and the first quarter <br /> 2001 Two groundwater samples were collected from MW-1 during October 2000 and January <br /> 2001 The samples were analyzed for extractable hydrocarbons and gasoline constituents, <br /> benzene, toluene, ethylbenzene, and total xylenes (BTEX), during both sampling events <br /> 20-1417-16 E04/ST02R038 <br /> Page 5 of 18 <br /> 0 2002 Kleinfelder,Inc June 7,2002 <br />