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WATER RESOURCES <br /> ' General <br /> The mining site lies between Boulder Creek and the Godding, <br /> ' Dailey and Plumb Ditch. Boulder Creek flows in a northeast <br /> direction at the eastern edge of the site and the ditch flows <br /> along much of the western site boundary. A 14 acre lake on <br /> ' the property is a result of previous gravel mining. <br /> Boulder Creek has its headwaters near the Continental Divide <br /> in the mountains above the city of Boulder. It is a live <br /> ' stream year around with a total tributary area of about 440 <br /> Square miles. Over half the drainage basin is in the mountains . <br /> Creek flow ranges from a low of 5 cfs in the winter to 1000 <br /> ' cfs during spring and summer runoff, when approximately 75% <br /> of the average annual flow occurs . Peak flows are regulated <br /> ' to some extent by Barker Reservoir, 12 miles upstream from the <br /> city of Boulder. Boulder Creek is a heavily over appropriated <br /> stream. Much of the flow in the latter part of the season is <br /> controlled by upstream uses. <br /> Dewatering <br /> ' Since the gravel is to be mined dry , a dewatering trench will <br /> be excavated by backhoe around each area before it is mined. <br /> Groundwater which seeps into the trench will be pumped into <br /> Boulder Creek. The pumping will be monitored under NPDES permit. <br /> 1 <br /> Dewatering will lower water levels of groundwater in <br /> ' G-1 <br />