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4.0 HYDROLOGY AFTER PROPOSED BULKHEADS ARE /NSTALLED <br />This section outlines the overall hydrologic situation which is expected to result from <br />the installation of underground bulkheads proposed by SGC. Many of the details and <br />supporting evidence for this conceptual hydrologic model are provided in the following <br />sections. <br />Once the bulkhead is installed in the American Tunnel (near the underground property <br />line with the Gold King Mine) waters presently leaving the Sunnyside Gold property <br />are expected to be impounded behind the bulkhead. The physical and chemical <br />integrity of the bulkhead itself are considered in a separate report by Abel, 1993. The <br />rate of localized leakage around the bulkhead is considered in Section 7.3 of this <br />report. <br />It should be noted that the proposed bulkhead near the underground property line is <br />expected to impound the water which originates on SGC property, but a significant <br />amount of water originating on Gold King property will not be impounded. Figure 7 <br />shows that approximately 930 gpm presently flows past the proposed American <br />Tunnel bulkhead site, but that approximately an additional 650 gpm flows into the <br />American Tunnel from Gold King property. Hence, the American Tunnel portal is <br />expected to flow an average of approximately 650 gpm even after installation of the <br />proposed bulkhead. The rate of flow downstream of the proposed American Tunnel <br />sunnylwpltraci122511Mar7 993.Ppt 22 <br />H:1 SIITIO(1 HYDRO-SERRCH <br />