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I I I I I I I I I I I I r: I I I I I ::, I I TABLE VI-l UNIT PRICES (January 1975) I tern CONCRETE - St ructu ra 1 Vertical walls European type wal Is Slab BR I DGES - New Add to existing Replace existing (with same) Small foot bridges SUPER SPAN CULVERTS 1,000 cfs capacity/barrel 1,500 cfs capacity/barrel EARTH WORK Excavation - Urban - Rural Ponds Closed Conduit - Structural - Mole tunnel Placement - Structural - Dam embankment (Excavation & fill) Riprap - Placed - Gabion - Grouted - Dumped GRASSING - Natural - seeded Blue Grass - seeded CLEANUP LAND (\IITH NO STRUCTURES) VI-2 TABLE VI-2 Unit co~ill 200 150 1')0 75 PHASE A ANNUAL UNIT COSTS FOR OPERATION AND MAINTENANCE* c.y, c.y. c.y. c.y. Annua 1 Cos t Type of Flood Conveyance s.f. sJ. s. f. s, f. Natural grasses, without sprinkler system $ 700/ acre of r.o.w. 25 35 15 5 Flood plains, undeveloped basin 0.20/foot Flood plains, developed basin 0.30/foot 1,245/acre 1,245/acre of grassed area 845/acre of raO.W. 845/acre of r.o.w. 1. f sJ. I.f. s . f . Grass-lined channel 275 15 375 17 European channel Concrete-lined channel c y, c.y. cy. cy. c,y, c y. c.y. c.y. 1.50 1. 25 1.00 2.00 3.00 6,00 3.00 0.30 Closed conduit Operation and maintenance for items such as the sediment basins were estimated on an engineering judgment basis to take care of small silt deposits, minor gradings, and occasional reseeding. c.y. c.y. c.y. c y. 35 60 40 10 * Channel annual 0 & M is based upon figures obtained from the City of Englewood resulting from the 1973 flood on Big Dry Creek and modified to apply to Ralston and Leyden Creeks. acre acre 500 1000 acre 1000 acre 6000