2014-01-21_REVISION - M1999058 (9)

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3. Hydrology The affected area drains exclusively into Yule Creek through a small tributary located as shown on Map C -2. This tributary is an ephemeral stream that only flows during spring snowmelt and summer thundershowers. Its drainage area is less than 10 acres. Yule Creek joins the Crystal River near the town of Marble approximately 2.5 miles north of the quarry. The closest standing water is located at beaver ponds approximately 1 mile north of the quarry. In the area near the quarry, Yule Creek is a rapidly falling high mountain stream. It drops approximately 600 feet from the southern end of the New Discovery claim to the northern end of the White Marble claim. Based on the drainage area, Yule Creek, where it joins the Crystal River at Marble, is estimated to have a mean flow of 42 and 76 cubic feet per second during May and June respectively. The drainage basin of Yule Creek is extremely steep, with some bare rock areas and high altitude pine forest. The base of Yule Creek is solid rock and is for all practical purposes non - erodible. The underground portions of the quarry receive water from faults in the marble, primarily in early summer. This water is generally retained within the settling sumps in the quarry. But during high runoff periods, some water discharge will be pumped from the sumps. The quality of the water in the sumps has been monitored periodically by the Colorado Department of Public Health and Environment. Records indicate no water quality problems and none are expected in the future due to the pure nature of the marble, which is calcium carbonate. CYMC operated the quarry under Permit No. CO- G- 500184 issued by the Colorado Department of Health. Sierra Minerals Corporation operated the quarry under a new Process Water and Stormwater permit from that agency. Polycor — Colorado Stone Quarries, Inc. now operated the quarry under Permit No: M- 1999 -058. Anew company, Colorado Stone Quarries, has now assumed the permit. The maximum flow from the quarry is estimated at 100 gpm (0.16 cfs) during the high flow season, so there should be no noticeable impact on Yule Creek from such discharge. The primary non - potable water use at the quarry is for cooling, dust control and flushing of the saw cuttings from the diamond wire saw and chain saw. Six diamond wire saws and two chain saws are used for the production. Each saw consumes an average 5 gallons of water a minute. Three development gallery saws are operated dry and consume no water. This rate is not consumptive since the water is reused from settling ponds and sumps in the quarry. Water from seepage into the quarry from Yule Quarry January 2014 11