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X25 ~ ~ 'A1 i 1 <br /> C. Culvert Improvements at Fredrick Court <br /> <br /> The recommended culvert improvement consists of replacing the existing 24" concrete culvert <br /> <br /> crossing at Fredrick Court with a 36" concrete pipe (Figure 1). This improvement is expected to <br /> eliminate the predicted flooding problem at this location'Tor the 10-year design storm. Since the <br /> proposed open waterway does not follow the original channel alignment, URS recommends <br /> abandoning the existing 24" culvert in place and constructing the 36" culvert according to the <br /> new alignment. <br /> PRELIMINARY COST ESTIMATE <br /> The following table presents the recommended capital projects and estimated project <br /> construction costs for the 34~' Avenue Storm Drainage system. The costs are based on unit costs <br /> that were developed for the Eugene Storm Drainage Master Plan capital projects, which do not <br /> include contingency costs, and on construction cost estimates from the recently completed Long <br /> Fellow Creek Habitat-Restoration Master Plan for the City of Seattle. The 20% mark-up shown <br /> represent costs associated with engineering design and administration. <br /> Preliminary Cost Estimate for Capital Improvements <br /> Location Capital Project Unit Cost Cost <br /> Im lications <br /> Delwood Drive 135 LF 36" CSP Re lacements $190/LF $26,000 <br /> Station 0+00 to 1+15 115 LF Open Waterway Improvements and Stream $100/LF* $11,500 <br /> Stabilization <br /> 370 LF Open Waterway Construction and <br /> Station 1+15 to 4+80 Stream/Natural Resource Enhancements $100/LF $37,000 <br /> Fredrick Court 45 LF 36" Concrete Pi a Culvert $200/LF $9,000 _ <br /> En ineerin Administration (20%) $16,700 <br /> Total $100,200 <br /> Note: *The unit cost provided includes the unit cost for open channel improvements (i.e., clearing/grubbing, <br /> excavation, truck haul, hydroseeding, and erosion control) of $20/LF and streambank stabilization (i.e., boulder bank <br /> tce) of $80/LF. . <br /> **The unit cost provided includes the unit cost for open waterway improvements (i.e., clearing/grubbing, <br /> excavation, truck haul, hydroseeding, and erosion control) of $20/LF, the unit cost.for stream enhancements (i.e., <br /> stream boulders, and tree covers) of $50/LF, and the unit cost for vegetation enhancement (i.e., trees and shrubs) of <br /> $30/LF. We assumed that natural resource enhancement (i.e., planting trees/shrubs) would be done on a 10 foot wide <br /> buffer within both sides of the open waterway. <br /> (;and ter( ~5-T c uP eoa t ~ ~t;~ <br /> a~ t ~ 3-}~ oac~ + ~ ~1,coo g'~/ 5cs~ . , : ~T. <br /> . , <br /> a <br /> S:\PRO194\945042ND1347'HAVE\CPMEMO.DOC 4 <br /> <br />