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' k4 KLEINFELDER <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 Mulls Facility, 2000 West Turner Road, Lodi, Califorma," dated January 19, 1999 Two <br /> soil borings, B1 and B2 (Plate 1) were advanced west of the existing underground storage tank to a <br /> depth of approximately 25 feet bgs in April of 1999 Groundwater was not encountered Soil <br /> ' samples collected from approximate depths of 20 and 25 feet bgs respectively, were subrrutted for <br /> laboratory analysis from both soil borings TPH-G and TPH-D were detected from both bonngs <br /> from one or more of the samples collected <br />' Ba HD requested <br /> Based upon these results Mr Harlin Knoll of the San Joaquin County PHSB q <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 morutoring 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 bgs A total of 9 soil samples <br /> were collected from boring MW-1 Petroleum-like odors were noted from soil samples collected at <br /> depths ranging from 15 to 40 feet bgs The soil samples submitted for analyses were collected at <br /> approximate depths of 20 and 30 feet bgs A total of 2 soil samples and a single groundwater <br /> sample collected from MW-1 were analyzed for TPH-D and BTEX <br />' Both of the soil samples collected at approximate depths of 20 and 30 feet bgs had reported <br /> P pp eP g P <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 mg/l <br />' Two BTEX constituents, ethylbenzene and total xylenes were also detected in this groundwater <br /> sample at 4 88 and 4 17 µg/l, respectively <br />' 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 during the January <br /> 2001 sampling event at the request of San Joaquin County Public Health Services, Environmental <br />' Health Division (PHS/EHD) <br /> TPH-D was detected in the groundwater samples collected from MW-1 during the October 2000 <br /> and January 2001 sampling events at concentrations ranging from 14 4 to 18 6 mg/1 BTEX were <br /> • not detected from groundwater samples collected during these two sampling events TPH-G, wluch <br /> 28209R18u I T Page 4 of I I <br /> T03 S 03 I g <br /> O 2003 Klemfelder, Inc December 29,2003 <br /> 1 <br />