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kTI KLEINFELDER <br /> 1 EXECUTIVE SUMMARY <br /> This report summarizes the Second Quarter 2005 groundwater sampling activities <br /> conducted in the vicinity of an underground storage tank (UST) at the General Mills <br /> Facility located at 2000 West Turner Road in Lodi, California <br /> Groundwater samples were collected from each of the four monitoring wells, MW-1, <br /> MW-2, MW-3, and MW-4 on May 27, 2005 (Plate 1) The groundwater samples were <br /> analyzed for total extractable petroleum hydrocarbons as referenced to diesel (TPH-D), <br /> purgeable hydrocarbons as referenced to gasoline (TPH-G), benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX) <br /> No product or sheen was observed in the groundwater samples collected from wells <br /> MW-2, 3, and 4 during this sampling event Approximately one-eighth of an inch of <br /> product and a strong petroleum-like odor were noted in the initial purge water from MW- <br /> 1 <br /> Groundwater elevations ranged from 0 51 feet at MW-2 to 1 87 feet at MW4 The <br /> groundwater flow direction was calculated to the southwest with an approximate <br /> gradient of 0 004 ft/ft This groundwater flow direction and gradient is consistent with <br /> previous quarterly sampling events (See Table 1) <br /> The analytical results for the groundwater samples collected are summarized in Section <br /> 5 and Table 2 of this report TPH-D and TPH-G were detected in the groundwater <br /> sample collected from MW-1 The concentration of TPH-D in MW-1 was 16 <br /> milligrams/liter (mg/1) and TPH-G concentration was 3 4 mg/I The BTEX constituents <br /> ethylbenzene and total xylene were detected at concentrations of 1 7 micrograms/liter <br /> (µg11) and 0 94 µg11 in groundwater collected from MW-1 None of the requested <br /> petroleum constituents, including TPH-G, TPH-D, and BTEX, were detected in the <br /> groundwater samples collected from the down-gradient monitoring wells, MW-2 and <br /> MW-3, or from the upgradient well, MW-4 Based on the information obtained, it is <br /> Kleinfelder's opinion that the groundwater contaminant plume is located in the vicinity of <br /> MW-1 and the existing UST area, and is apparently contained within perimeter <br /> monitoring wells MW-2, MW-3 and MW-4 For a complete summary of our findings, <br /> including conclusions and recommendations, please refer to Section 6 of this report <br /> A copy of this report should be submitted to the San Joaquin County Public Health <br /> Services Department, Environmental Health Division (EHD) and the State of California, <br /> Central Valley Regional Water Quality Control Board (CVRWQCB) for their review and <br /> comment <br /> This report, and the conclusions and recommendations presented, are subject to the <br /> "Limitations" presented in Chapter 7 of this report Any party other than the client who <br /> would like to use this report shall notify Kleinfelder, Inc of such intended use in writing <br /> for permission <br /> 28209 T091ST051313230H Iv Page 1 of 12 <br /> 02005, Kleinfelder, Inc October 21,2005 <br />