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K L E I N F E L D E R <br /> M <br /> The General Mills facility utilized this and the previously removed UST for fuels used to run the <br />' turbines in their production process which has been stored onsite in two 10,000 gallon underground <br /> storage tanks discussed in the text of this report Kleinfelder understands that there is only one UST <br /> in place and that the UST has been emptied of all contents <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 analyses from both soil bonngs Total <br /> petroleum hydrocarbons as referenced to gasoline and diesel (TPH-G and TPH-D) were detected <br /> from both borings from one or more samples collected at depths of 20 to 25 feet bgs A summary <br /> of the boring locations and the results are summarized in Plate 1 and Table 1, respectively, found in <br /> the Appendix <br /> Based upon these results the PHS/EHD requested installation of a single monitoring well (MW-1) <br /> immediately southwest of the existing UST The location of the well was requested by Harlin <br />' Knoll of PHS/EHD based on previous assessments at the General Mills facility, which showed a <br /> localized southwest groundwater gradient in the past Based upon PHS/EHD comments and desires <br /> General Mills retained Kleinfelder to conduct additional assessment in the vicinity of the UST <br /> based upon Kleinfelder's workplan titled "Proposal/Cost Estimate, Monitoring Well Installation, <br /> Pre-Abandonment Underground Storage Tank Assessment, General Mills Facility, 2000 West <br /> Turner Road,Lodi, California", dated May 2, 2000 <br /> A single monitoring well (MW-1) was subsequently installed on May 23, 2000 just southwest of <br /> an existing UST at the subject site During advancement of the soil boring groundwater was <br /> encountered at about 34 feet bgs The monitoring well was advanced vertically to a depth of <br /> approximately 45 feet below ground surface (bgs) and screened form 25 to 45 feet <br />' Soil samples were collected at 5-foot intervals beginning at 5 feet from ground surface A total <br /> of 9 soil samples were collected from boring MW-1 Petroleum-like odors were noted from soil <br /> 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 <br /> and 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, total xylenes <br /> (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 CIO to <br /> C16) BTEX constituents were not detected at or above laboratory reporting limits in these two <br /> soil samples The groundwater sample collected form MWA 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 µg/1, respectively <br /> ' 20-1417-16 E03/201 1 8259 Page 4 of 1 i <br /> Copyright 2001 Kleinfelder Inc February 28 2001 <br />