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k'1 KLEINFEL©>E: R <br /> 1. EXECUTIVE SUMMARY <br /> ' This report summanzes the Third Quarter 2004 groundwater sampling activities conducted in the <br /> vicinity of a 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 monrtonng wells, MW-1, MW-2, <br /> ' MW-3, and MW-4 on August 25, 2004 (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), 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 /> and 4 during this sampling event Approximately one-fifth 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 -1 50 feet at MW-2 to -010 feet at MW-4 The <br /> groundwater flow direction was calculated to the southwest with an approximate gradient of <br />' 0 004 ft/ft This groundwater flow direction and gradient is consistent with previous quarterly <br /> sampling events (See Table 1) <br /> The analytical results for the groundwater samples collected are summanzed 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 24 milligrams/liter (mg/1) and TPH-G <br /> concentration was 1 1 mg/1 The BTEX constituent ethylbenzene was detected with a <br /> concentration of 0 79 micrograms/liter (µg/1) from groundwater collected from MW-1 None of <br /> the requested 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 MW-3, nor <br /> from the upgradient well MW-4 Based on the information obtained, it is Kleinfelder's opinion <br /> that the groundwater contaminant plume is located in the vicinity of MW-1 and the existing UST <br />' area, and is apparently contained within perimeter monitoring wells MW-2, MW-3 and MW-4 <br /> For a complete summary of our findings, including conclusions and recommendations please <br /> refer to Section 6 of this report <br />' A c f this report should be submitted to the San Joaquin County Public Health Services <br /> copy o p q <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/STO4R1402/DH 1v Page 1 of 1 <br />' (0 2004,Kleinfelder, Inc October 20,2004 <br />