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10 Summary of Findings <br /> 1 <br /> 3.1 Site Hydrogeologk <br /> The well casing elevations were previously surveyed relative to an arbitrary bench mark at the <br /> site that was set to 100 06 feet. Water table depths were measured from both shallow and deep <br /> wells. The water table elevations measured on August 22, 1996 vaned between 37.06 feet and <br /> 40.06 feet A summary of groundwater elevation data is provided in Table 1. <br /> Monitoring wells MW-1, MW-2 and MW-3 (termed shallow wells) are screened within the <br /> upper portion of the unconfined aquifer, and have screen bottom depths of 63 feet, 64 5 feet and <br /> 65 5 feet below ground surface (bgs), respectively Each screen length is 20 feet. The average <br /> groundwater elevation measured in these wells on August 22, 1996 was 39 30 feet The average <br /> August 1996 groundwater elevation was 7.91 feet below the average May 1996 groundwater <br /> elevation. The groundwater in the upper portion of the unconfined aquifer had a north- <br /> northwest gradient of approximately 0 012 ft/ft <br /> Monitoring wells MW-4, MW-5 and MW-6 (termed deep wells) are screened within the lower <br /> portion of the unconfined aquifer and have screen bottom depths of 95 feet, 89 feet and 88 feet <br /> bgs, respectively. Each screen length is 20 feet The average groundwater elevation in these <br /> wells on August 22, 1996 was 37 73 feet. The average August 1996 groundwater elevation was <br /> 8 18 feet below the average May 1996 groundwater elevation The groundwater in the lower <br /> portion of the unconfined aquifer had a northerly gradient of approximately 0.020 ft/ft <br /> The water level data for the two sets of wells indicate distinct potentiometric surfaces within the <br />' unconfined aquifer, depending on the depth of the screened interval. In August 1996, the <br /> average water level elevation measured in the three shallow wells was 1.57 feet higher than the <br /> average water elevation measured in the three deeper wells. This indicates a downward <br /> component of flow, and is consistent with previous results Potennometrnc surface maps for <br /> both shallow and deep monitoring wells are presented in Figure 2. <br /> 3.2 Groundwater Quality Data <br /> TPH as diesel was detected in MW-3 at 70µg/1 and in MW-4 at 130µg/1. TPH as diesel was <br /> not detected in MW-1, MW-2, MW-5 or MW-6. The quality control sample (equipment nnsate) <br /> collected during the sampling did not yield any TPH as diesel The laboratory quality control <br /> data was determined to be acceptable. <br /> MZI09-18-96/VDBF/96-0019 js 3-1 <br />