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KLEENFELDER <br /> Kleinfelder conducted a soils assessment in the vicinity of the existing UST based upon <br /> our proposal titled "Revised Proposal, Pre-Abandonment Underground Storage Tank <br /> Assessment, General Mills Facility, 2000 West Turner Road, Lodi, California," dated <br /> January 19, 1999 Two soil borings, B1 and B2 (Plate 1) were advanced west of the <br /> existing underground storage tank to a depth of approximately 25 feet bgs In April of <br /> 1999 Groundwater was not encountered from either of the two borings Soil samples <br /> collected from approximate depths of 20 and 25 feet bgs respectively, were submitted for <br /> laboratory analysis from both soil borings TPH-G and TPH-D were detected from both <br /> bonngs from one or more of the samples collected <br /> Based upon these results, Mr Harlin Knoll of the San Joaquin County PHS/EHD <br /> requested installation of a single monitoring well southwest of the existing UST The well <br /> location Is based on previous assessments at the General Mills facility, which showed a <br /> localized southwest groundwater gradient Based upon PHSIEHD comments and <br /> desires, General Mills retained Kleinfelder to install the monitoring well <br /> A single monitoring well (MW-1) was subsequently installed on May 23, 2000 just <br /> southwest of an existing UST at the subject site During advancement of the sal boring, <br /> groundwater was encountered at approximately 34 feet bgs The monitoring well was <br /> advanced vertically to a depth of approximately 45 feet bgs and screened from 25 to 45 <br /> feet <br /> Soil samples were collected at 5-foot intervals beginning at 5 feet bgs A total of 9 soil <br /> 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 <br /> for analyses were collected at approximate depths of 20 and 30 feet bgs A total of 2 soil <br /> samples and a single groundwater sample collected from MW-1 were analyzed for TPH- <br /> D and BTEX constituents <br /> Both of the soil samples collected at approximate depths of 20 and 30 feet bgs had <br /> reported concentrations of TPH-D at 3,770 mg/kg and 2,880 mg/kg, respectively (Carbon <br /> range C10 to C16) BTEX constituents were not detected at or above laboratory reporting <br /> limits in these two soil samples The groundwater sample collected from MW-1 was <br /> reported by the laboratory as having a TPH-D concentration of 46 8 milligrams/liter (mg/1) <br /> Two BTEX constituents, ethylbenzene and total xylenes, were also detected In this <br /> groundwater sample at 4 88 and 4 17 micrograms/liter (µg/l), respectively <br /> Kleinfelder conducted groundwater sampling for the fourth quarter 2000 and the first <br /> quarter 2001 Two groundwater samples were collected from MWA during the October <br /> 2000 and January 2001 quarterly sampling events During both sampling events the <br /> samples were analyzed for the following extractable hydrocarbons and gasoline <br /> constituents benzene, toluene, ethylbenzene, and total xylenes (BTEX) Purgeable <br /> hydrocarbons as referenced to gasoline were also analyzed during the January 2001 <br /> sampling event at the request of PHS/EHD <br /> 28209 T091ST05R1323/DH Iv Page 4 of 12 <br /> O 2005, Kleinfelder, Inc October 21, 2005 <br />