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<br />(i) Ground and Surface Water: The sediment control structure constructed by CYMC <br />has not been effective in preventing calcium carbonate fines from reaching Yule Creek at the toe <br />of the waste piles. According to CYMC personnel, a higher rate of sedimentation has occurred <br />only since the new road around the east side of the south waste pile was constructed in 1998 and <br />only when quarry water is pumped into the waste piles. Apparently, the excavation work for this <br />new road mobilized significant quantities of fines. CYMC had also dumped waste blocks into <br />and on top of the sediment control structure. As a resuh, the structure has apparently failed. <br />Small quantities of sediment was observed to be reaching Yule Creek in early June of 1999 (just <br />after snow melt allowed such an observation), whereupon Siena moved its quarry water <br />discharge from the top of the waste pile neaz Entry No. 3, to a point directly feeding into Yule <br />Creek east of Entry No. 3. The change was made with the approval of the Colorado Department <br />of Health. After moving the water discharge point, flow of water and sediment from the toe of <br />the waste pile was observed to be zero. This observation occurred the morning after a heavy <br />rainstorm in the Marble azea. <br />There has been no other significant effect on the quantity and quality of ground water or <br />surface water from CYMC's past operations, and none is anticipated with Sierra's operations. <br />Sierra has prepazed a Stormwater Management Plan in compliance with the rules defined by the <br />Water Quality Control Division of the Colorado Department of Health. This plan includes the <br />use of Best Management Practices for storm water. Sierra will comply fully with the terms of its <br />discharge permit and Stotmwater Management Plan. <br />The diesel fuel tank is placed within a heavy membrane lined berm structure whose <br />volume exceeds the capacity of the tank. Operating practice will include keeping the dischazge <br />valve of the main tank closed and locked during non-operating hours. <br />(i) Water Rights: A well permit was acquired by CYMC from the Colorado Division of <br />Water Resources. Sierra received approval of a transfer of ownership of the well permit on May <br />14, 1999. (Permit No. 034872-F, copy shown on the following page). There has been no <br />reported effect on existing water rights from CYMC's past operations, and none is anticipated <br />with Sierra's operations. <br />(k) Refuse, Acid, sod Toaic Materials: The quarry operation generates no refuse, acid, <br />or toxic materials other than the waste marble to be placed on the surface as discussed above. <br />Maintenance of diesel powered equipment will generate waste oil and other fluids that will be <br />transported off site and disposed of in an approved manner. Other refuse will be transported off <br />site and disposed of in an approved manner. <br />19 <br />