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n INTRODUCTION P d S urpose an cope The purpose of this report is to describe drainage related - features associated with the Cooley Gravel Company Morrison ~ gravel quarry. The report also addresses other engineering matters related to water resources. This report is supple- mentary to the report "Potential Impacts on Environment" dated November 1972, prepared by the Thorne Eecological Institute, and describes the engineering facilities and features necessary I ' to accomplish many of the recommendations contained in the Thorne report. Detailed information on the site is in the ' Thorne report and generally will not be repeated here, except as necessary for clarity. Supplementary reports have been prepared annually by Thorne which describe periodic progress ' and conditions of the environmental aspects. ' In the Thorne report of 1972, a hydrology study was pre- pared by M. W. Bittinger & Associates, a consulting engineering firm at Fort Collins, Colorado. The Cooley Gravel Company also commissioned the firm of W. W. Wheeler & Associates to prepare a flood runoff study in 1971, also for the purpose of defining the flood potential and required size of a facility to safely pass the runoff from Strain Gulch through the operating area. t This drainage report utilizes the basic data prepared :in these previous studies. ' The facilities described as needed, either during or after the mining operation, are in the nature of engineering ' recommendations and conceptual designs. Because the operation will take place over many years and operation conditions may ' be observed which requires modification to the drainages plan, detailed designs are not required until such time as the implementation program for the construction of the facilities t ' ~(~ Leonard Rice Consuit~og Water Engineers. Inc ~ ` ~ ~~ -- ` _