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KLEINFFLDER <br /> 1 EXECUTIVE SUMMARY <br /> This report summarizes the First Quarter 2005 groundwater sampling activities conducted in the <br /> vicinity of an underground storage tank (UST) at the General Mills Facility located at 2000 West <br /> Turner Road in Lodi, California <br /> Groundwater samples were collected from each of the four monitoring wells, MWA, MW-2, <br /> MW-3, and MW-4 on March 10, 2005 (Plate 1) The groundwater samples were analyzed for <br /> total extractable petroleum hydrocarbons as referenced to diesel (TPH-D), purgeable <br /> hydrocarbons as referenced to gasoline (TPH-G), benzene, toluene, ethylbenzene, and total <br /> xylenes (BTEX) <br /> No product or sheen was observed in the groundwater samples collected from wells MW-2, 3, <br /> and 4 during this sampling event Approximately one-eighth of an inch of product and a strong <br /> petroleum-like odor were noted in the initial purge water from MW-1 <br /> Groundwater elevations ranged from 0 35 feet at MW-2 to 1 37 feet at MW-4 The groundwater <br /> flow direction was calculated to the southwest with an approximate gradient of 0 003 ftlft This <br /> groundwater flow direction and gradient is consistent with previous quarterly sampling events <br /> (See Table 1) <br /> The analytical results for the groundwater samples collected are summarized in Section 5 and <br /> Table 2 of this report TPH-D and TPH-G were detected in the groundwater sample collected <br /> from MW-1 The concentration of TPH-D in MW-1 was 14 milligrams/liter (mg/1) and TPH-G <br /> concentration was 1 5 mg/1 The BTEX constituents ethylbenzene and total xylene were detected <br /> at concentrations of 1 4 micrograms/liter (µg/1) and 0 57µg11 in groundwater collected from MW- <br /> 1 None of the requested petroleum constituents, including TPH-G, TPH-D, and BTEX, were <br /> detected in the groundwater samples collected from the down-gradient monitoring wells, MW-2 <br /> and 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 MW-1 <br /> and the existing UST area, and is apparently contained within perimeter monitoring wells MW-2, <br /> MW-3 and MW-4 For a complete summary of our findings, including conclusions and <br /> 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 Services <br /> Department, Environmental Health Division (EHD) and the State of California, Central Valley <br /> Regional Water Quality Control Board (CVRWQCB) for their review and comment <br /> This report, and the conclusions and recommendations presented, are subject to the "Limitations" <br /> presented in Chapter 7 of this report Any party other than the client who would like to use this <br /> report shall notify Kleinfelder, Inc of such intended use in writing for permission <br /> i <br /> 28209 T06/STO5R717/LTV lv Page 1 of 11 <br /> C 2005,Kleinfelder, Inc June 23,2005 <br />