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^* 5 August 1992 <br /> (GeoAudit CV 30-34E3-1. 47) <br /> Page 4 of 6 <br /> elevations were surveyed to the nearest 0. 01 foot, relative to a <br /> temporary bench mark with an assumed elevation of 100 feet. A <br /> Solinist water meter was used to measure the depth to water in MW- <br /> 1, MW-4 and MW-5 and the relative groundwater elevation in the <br /> three wells was calculated: <br /> f <br /> Relative Relative <br /> Casing Depth to Ground Water <br /> Well No. Elevation Water Elevation <br /> IMW-1 98. 16 59. 33 38. 83 <br /> MW-3 97.93 ----- ----- <br /> MW-4 98. 30 59 .50 38. 80 <br /> MW-5 96.78 58 . 39 38. 39 <br /> These data indicate that 14W-1 and MW-3 are equi-gradient and that <br /> groundwater is slightly deeper in MW-5. This suggests a groundwater <br /> 1 gradient to the west or northwest, roughly 900 to the north- <br /> northeast gradient measured by Weiss Associates in November 1987 . <br /> To confirm these results, the depth to groundwater was again <br /> measured on 4 August 1992: <br /> Relative Relative <br /> Casing Depth to Ground Water <br /> Well No. Elevation Water Elevation <br />�l <br /> MW-1 98. 16 60.46 37.70 <br /> MW-4 98. 30 60.72 37. 58 <br /> MW-5 96. 78 59. 58 37. 20 <br /> These data indicate that water levels have dropped one foot since <br /> ' 30 June, but confirm that the present groundwater gradient is to <br /> the northwest. The calculated gradient is 0. 01. <br /> ` CONCLUSIONS <br /> 1) Field observations and analytical results of soil and water <br /> . -- .••r..-*. c•-++.- ..cd I:: , J oJ4 ir'a Cats . aqua. ai� a1 J.aJ a.cai l.v 11 <br /> contamination is present in groundwater in the area near the <br /> former UST, but no soil contamination was detected. Moderate <br /> levels of contamination that exceed the DHS action levels for <br /> BTE&X and TPH were detected in MW-4 and MW-5 in the 30 June <br />.;` 1992 sampling event. <br />