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(Page 3) <br /> MINE ID # OR PROSPECTING ID # M ;;__378 <br /> INSPECTION DATE 7-27-93 INSPECTOR'S INITIALS ACS <br /> also apply to these locations. These are the least accessible of the proposed bulkhead <br /> locations; it will require careful planning and precise execution for installation of the <br /> plugs, particularly in terms of mixing and pouring of the concrete, for these plugs to meet <br /> the performance standards included in the design. This inspection was the final step in the <br /> process for partial approval of TR-14 regarding the Brenneman-Sunnyside connection bulkheads. <br /> Based on observations made the division can issue the partial approval requested with the <br /> requirement that the long-sections previously discussed demonstrate sufficient tunnel wall <br /> irregularity, and with the concept of a pre-pour inspection, PE certification, and other <br /> applicable items included in the adequacy review correspondence for TR-14 also included as <br /> conditions to approval. <br /> Terry Tunnel Bulkhead Location <br /> Observations at this location were similar to those documented for the American Tunnel in <br /> terms of geologic structure, etc. In addition, maximum line of site into the tunnel from the <br /> proposed bulkhead location was observed. This has a bearing on plug stability under <br /> earthquake loading in terms of acceleration of the impounded water against the bulkhead. <br /> Observations confirm that the tunnel deviates from a straight line, thus limiting the line <br /> of site distance. <br /> Other Observations-Sunnyside Basin <br /> Reclamation in Sunnyside Basin, including the back-filled Lake Emma hole, was observed from <br /> a vantage point on the south-facing slope of Sunnyside Basin. The groundwater diversions <br /> proposed in TR-15 would be constructed down-gradient from mine related disturbance, including <br /> the Washington and Sunnyside Pits. The exposed pit walls are dry. The diversions would be <br /> excavated, however, into native, or essentially undisturbed alluvium and colluvium. The <br /> question remains as to whether the intercepted ground water would be "process" water, in <br /> terms of clean water regulations. <br /> I & E Contact Address cc: Jim Stevens, DMG <br /> NAME Larry Perino <br /> OPERATOR Sunnyside Gold Corporation <br /> STREET P.O. Box 177 <br /> CITY/STATE/ZIP Silverton, CO 81433 <br />