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tk'q KLEINFELDER <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 /> borings from one or more of the samples collected <br /> Based upon these results, Mr Harlin Knoll of the SJC/EHD requested installation of a <br /> single monitoring well southwest of the existing UST The well location is based on <br /> previous assessments at the General Mills facility, which showed a localized southwest <br /> groundwater gradient Based upon SJCIEHD comments and desires, General Mills <br /> 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 sod 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 on June 6, 2000 had <br /> a reported TPH-D concentration of 46 8 milligrams/liter (mg/1) Two BTEX constituents, <br /> ethylbenzene and total xylenes, were also detected in this groundwater sample at 4 88 <br /> and 4 17 micrograms/liter (4g/1), respectively <br /> Kleinfelder conducted groundwater sampling for the fourth quarter 2000 and the first <br /> quarter 2001 Two groundwater samples were collected from MW-1 during the October <br /> 2000 and January 2009 quarterly sampling events During both sampling events the <br /> samples were analyzed for extractable hydrocarbons and BTEX A groundwater sample <br /> was also analyzed for TPH-G during the January 2001 sampling event at the request of <br /> SJC/EHD <br /> TPH-D was detected in the groundwater samples collected from MW-1 during the <br /> October 2000 and January 2001 sampling events at concentrations ranging from 14 4 to <br /> 18 6 mg/1 BTEX were not detected from groundwater samples collected during these <br /> two sampling events TPH-G, which was analyzed for the first time in January 2001, was <br /> detected in the groundwater sample collected from MW-1 at 3 3 mg/I <br /> 28209 T09/ST06R160/CD Iv Page 4 of 12 <br /> 0 211015 Klemfelder, Inc February 15, 2006 <br />