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i s <br /> I i <br /> Project No 58080-06-02 <br /> May 5, 1995 <br /> n <br /> ' equipped with an interface probe with measurements obtained from the top of well casings The <br /> interface probe, which is capable of measuring thicknesses of both hydrocarbon product and water, <br /> did not detect hydrocarbon product <br /> ' Prior to groundwater collection, at least three well volumes of groundwater was purged to allow <br /> fresh formation water to infiltrate the wells During purging, the pH, temperature, and electrical <br /> conductivity of the groundwater was measured and the purging was considered complete when these <br /> parameters stabilized to within 10% <br /> Groundwater samples were collected utilizing disposable Voss polyethylene bailers The samples <br />' were placed in laboratory provided volatile organic analysis {VOA} vials and 1-liter amber Jars, <br /> labeled, chilled, and delivered to Sequoia Analytical, a California certified analytical laboratory, <br /> following standard chain-of-custody procedures <br /> 28 Analytical Methods <br /> Soil samples were transported to Sequoia Analytical for testing of TPHg and TPHd following EPA <br /> Test Method 8015 modified, and BTEX and MTBE following EPA Test Method 8020 <br /> Groundwater samples were transported to Sequoia Analytical for testing of TPHg and TPHd <br /> following EPA Test Method 8015 modified, BTEX and MTBE following EPA Test Method 8020 <br /> and Purgeable Halocarbons following EPA Test Method 601 I <br /> i <br /> 29 Well Survey <br />' The elevations of the top of each well casing for wells MW-1 through MW-5 were surveyed relative <br /> to City of Lodi Benchmark 4516 by a Geocon Registered Civil Engineer The survey data for each <br /> well is included to Table Il, Summary of Groundwater Elevation Measurements <br /> -13- <br /> 1 <br />