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WEISS ASSOCIATES <br /> A former irrigation well is located in a concrete vault within the slab floor of the <br /> processing plant Groundwater was measured at 68 ft depth in this well, which has a sounded <br /> depth of 138 ft No other information regarding the construction of this well is available <br /> In 1988, the static ground water depth in the municipal wells was approximately 50 ft <br /> to 60 ft bgs In March, 1990, water levels in the municipal wells were approximately 70 ft bgs <br /> This drop is apparently caused by regional ground water pumping overdraft (Cox, 1991) <br /> 14 PREVIOUS INVESTIGATION <br /> In December 1988, WA investigated soil conditions directly beneath the five storage <br /> vaults The objective of the investigation was to determine whether stored compounds were <br /> in soil beneath the vaults A total of nine soil borings were drilled near the vaults at angles of <br /> approximately 450 from vertical, and soil samples were collected from the borings The <br /> 1 investigation results, including the locations of the soil borings and soil samples, are described <br /> in a May 1989 WA report (Weiss Associates, 1989) Two soil borings were drilled beneath each <br /> of Vaults 1, 6, 7, and 8, and one boring was drilled beneath Vault 5 The samples collected <br /> beneath the vaults were analyzed as follows <br /> VaMlt 1 Vault 5 Vault 6 Vault 7 Vault 8 <br /> Propylene Glycol X X X <br /> Ethylene Glycol X X X <br /> Total Chromium X X <br /> Hexavalent Chromium X <br /> Copper X X <br /> Sodium X X <br /> Sulfates X X <br /> Calcium X <br /> Chlorides X <br /> D IALL1331DWG1331RIMA1 WP Page 3 <br />