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k'9 KLEINFELDER <br /> 1 EXECUTIVE SUMMARY <br /> 1 <br />' This report summarizes the Fourth Quarter 2004 groundwater sampling activities conducted in <br /> the vicinity of a underground storage tank (UST) at the General Mills Facility located at 2000 <br /> West 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 November 23, 2004 (Plate 1) The groundwater samples were analyzed <br />' for total extractable petroleum hydrocarbons as referenced to diesel (TPH-D), purgeable <br /> hydrocarbons as referenced to gasoline (TPH-G), and 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 /> p �' P , <br />' and 4 during this sampling event Approximately one-fourth 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 17 feet at MW-2 to 1 30 feet at MW-4 The groundwater <br /> i flow direction was calculated to the southwest with an approximate gradient of 0 004 ft/ft 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 26 milligrams/liter (mg/1) and TPH-G <br /> concentration was 0 87 mg/l The BTEX constituents ethylbenzene and total xylene were <br />' detected with a concentrations of 1 3 micrograms/liter (µg/1), and 0 57 (µg11) from groundwater <br /> collected from MW-1 None of the requested petroleum constituents including TPH-G, TPH-D <br /> and BTEX were detected in the groundwater samples collected from the down-gradient <br /> monitoring wells, MW-2 and MW-3, nor from the upgradient well MW-4 Based on the <br /> information obtained, it is Kleinfelder's opinion that the groundwater contaminant plume is <br /> located in the vicinity of MW-1 and the existing UST area, and is apparently contained within <br />' perimeter 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 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 /> 28209 T03/5TO5R277/DH Iv Page I of I I <br />' t 2005 Kleinfelder, Inc March 10, 2005 <br />