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5.0 EST/MAT/ON OF HYDRAUL/C HEAD AND HYDRAUL/C <br />CONDUCT/V/TY FROM FLOW TESTS <br />The average hydraulic conductivity of the fractured volcanic rocks near the 0700 and <br />1500 runarounds in the American Tunnel is estimated to be on the order of 5x10-5 <br />cm/sec 10.15 feet/day). These conclusions are based on an analysis of flow tests <br />described in detail in the remainder of this section. Rock in the vicinity of the flow <br />tests may be somewhat more permeable than is typical for the deep rocks in the <br />vicinity of the Sunnyside Mine. <br />Constant discharge flow tests. were conducted on December 17 and 18, 1992, from <br />two longholes (diamond drill holes) located in the American Tunnel. The purpose of <br />these tests was to estimate the present hydraulic head over the American Tunnel and <br />to estimate the average hydraulic conductivity of the fractured volcanic rocks in the <br />vicinity of the tests. The analytical techniques applied to the test results can only <br />produce rough averages over the entire length of open borehole. <br />5. 7 Description of the Dri// Ho%s Used for F/ow Testing <br />In the Terry Tunnel (F-level) a diamond drill hole was drilled in late 1992 for the <br />purpose of estimating hydraulic parameters. The hole was drilled east-northeast from <br />the general vicinity of one of the bulkhead sites proposed by SGC. As expected, the <br />hole did not encounter water and no flow testing was conducted. <br />tunny\wp\traci122511Mar1993.Rpt 27 <br />Hit SIIT10t1 HYDRO-SERRCH <br />