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I. . I . I . I I 1.5 Background Information Background information provided by the sponsors was used to develop hydrologic and hydraulic analysis for this FHAD. Information provided is identified in Section 5, References. 1.6 FHAD Mapping Information The FHAD mapping was prepared according to the "UDFCD Guidelines for FHAD Mapping for use in DFIRMS" dated March 19,2002. 1.7 Survey Information Topographic mapping and survey data for stream/roadway crossings were provided by High Desert Surveying, LLC from Grand Junction, Colorado. Topographic mapping was prepared with two-foot contour intervals at a scale of 1"=100'. Descriptions of the benchmark locations and elevations used to establish bridge and roadway elevations are included as follows and are shown on the plan and profile sheets in the Appendix. Other monuments set for aerial photography are also included on the plans. Horizontal and vertical data for these points can be obtained from the Urban Drainage and Flood Control District. I) Colorado State Plane Coordinates North Zone Modified to 5500 Vertical Datum: NA VD88 I . I I . 1 . I '.' I Benchmark Northing Easting Elevation Location Description (NA VD88) RLl 1186495.9418 3090203.8616 5645.830 North of Leyden Creek, East of Quaker Road, approx 130' south of and centered between 2 manholes RL2 1178438.4458 3089556.3631 5615.790 North of Ralston Creek, West side of Quaker Road, 28.1' northeast of creek headwall RL3 1178096.3105 3094842.3352 5540.920 North end of steel guard rail across Ralston Creek on west side of Indiana Street RL4 1184695.5196 3094911.7540 5561.430 South side of Leyden Creek, East side of Indiana Street, 26.4' NE of power pole RL5 1183666.8692 3099822.3730 5492.830 South of Leyden Creek, West of Beech Street, 19.9 feet NE of fence post RL6 1178798.5158 3099356.9097 5485.640 South of Leyden Creek, East of Beech Street, 64.8' southeast of concrete headwall RL7 1179774.9339 3105161.7621 5429.640 South of Leyden Creek, West of Simms Street, approx. 25.5 feet northwest of railroad ties RL8 1178513.5584 3105185.4432 5428.030 South of Ralston Creek, West of Simms Street, 12.6' south of headwall RL9 1175994.6831 3019342.6355 5384.070 South of Ralston Creek, East of Miller Street, 28.4' east of southeast wingwall RL10 1172223.3061 3115867.9101 5334.560 South of Ralston Creek, East of Carr Street, 15' east of east headwall, north of southeast wingwall RLIl 1172099.5974 3120998.2585 5297.490 North of Ralston Creek, West of Pierce Street, 12.8 feet to end of bridge RL12 1169489.8603 3126231.9556 5256.800 North ofl-76, West of Sheridan,llT northwest of power pole 1.8 Acknowledgements This report was prepared by Boyle under contract with the District (Agreement No. 01-10.04). Boyle wishes to acknowledge the various individuals who assisted in the preparation of the study. These individuals were routinely coordinated with during the process, and participated by providing technical guidance and information during the course of the study: Name Dave Lloyd Bill DeGroot Patrick Dougherty Georgia Simpson Paula Lundquist Representing Urban Drainage and Flood Control District Urban Drainage and Flood Control District City of Arvada City of Arvada Jefferson County Highway Department The following members of the project team also contributed to this report: Boyle Engineering Corporation Douglas Stewart Project Manager Joel Carrasco Project Engineer 2