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1-2 I I I I I I I I I I I I I I I I I , I I I the 100 year recurrence interval values was defined and presented in the Phase A report. Other alternative plans were defined and discussed as to advantages and disadvantages. The Phase A report was submitted to the U.D. & F.C.D. on June 18, 1975. The report was reviewed by the participating entities and a notice to proceed on the Phase B design of the recommended alter- natives was received on July 30, 1975. The purpose of the Phase B portion of the study can be summarized as follows: Prepare a preliminary design of the subject drainage courses for the selected alternative plan. The design shall be of adequate detail to permit U.D. & F.C.D., Arvada and Adams County to properly plan bridges and culverts for new vehicular thoroughfare construction. The plan shall also be in sufficient detail to permit the acquisition of needed channel right-of-way and to permit the planning of new sub- divisions and buildings with full knowledge of future channel and floodplain locations and characteristics. The drawings shall also show the plan and profile of the 100 year floodplain under existing and improved channel conditions for fully developed flows, in sufficient detail to allow administration of the floodplain regulations. The scope of work included the following: 1. Prepare final hydrologic and hydraulic studies to determine the magnitude and volume of the storm runoff to be subsequently used in the preliminary design of drainage facilities of the selected alternate plan. 2. Prepare preliminary design of the drainage facilities on 1" = 100' plan and profile maps with a contour interval of two feet. 3. Prepare a detailed cost estimate of the proposed improvements for Arvada, Adams County and the total drainageway.