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' k" K L E IN E E L D E R <br /> UST 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, Fre-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 respectively were submitted for laboratory analysis from <br /> both soil borings Total petroleum hydrocarbons as referenced to gasoline and diesel (TPH-G and <br /> 1 TPH-D) were detected from both borings from one or more of the samples collected <br /> Based upon these results Mr Harlin Knoll of the San Joaquin County PHS/EHD requested <br />' installation of a single monitoring well southwest of the existing UST The well location is based <br /> on previous assessments at the General Mills facility, which showed a localized southwest <br /> groundwater gradient Based upon PHS/EHD comments and desires, General Mills retained <br />' Kleinfelder to install the monitoring well <br /> A single monitoring well (MW-1) was subsequently installed on May 23, 2000 just southwest of an <br />' 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 depth <br /> of approximately 45 feet bgs and screened from 25 to 45 feet <br /> Soil samples were collected at 5-foot intervals beginning at 5 feet from the 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 analyses <br /> were collected at approximate depths of 20 and 30 feet bgs A total of 2 soil samples and a single <br />' groundwater sample collected from MW-1 were analyzed for total petroleum hydrocarbons as <br /> referenced to diesel (TPH-D) and benzene, toluene, ethylbenzene, and total 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 soil <br /> 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 µg/l, respectively <br /> 1 Kleinfelder conducted groundwater sampling for the fourth quarter 2000 and the first quarter 2001 <br /> Two groundwater samples were collected from MW-1 during the October 2000 and January 2001 <br />' quarterly sampling events The samples were analyzed for extractable hydrocarbons and gasoline <br /> constituents, benzene, toluene, ethylbenzene, and total xylenes (BTEX), during both sampling <br /> events Purgeable hydrocarbons as referenced to gasoline were also analyzed dunng the January <br /> 2001 sampling event at the request of San Joaquin County Public Health Services, Environmental <br /> Health Division (PHS/EHD) <br /> 18748 T02/ST02R795 <br /> Page 4 of 1 I <br />' ©21102 Klemfelder,Inc December 3,2002 <br />