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Public Amenities Master Plan <br /> 7 <br /> Preliminary Cost Estimate July 2009 <br /> Bigelow Creek Enhancements <br /> including Water Quality Improvement Facility <br /> Description of Potential Project Elements <br /> Construct water quality improvement facility as constructed wetland (per design report); <br /> excavate new stream alignment through South Wetland Complex, from stormwater facility <br /> to Snohomish River outfall; excavate portions of adjacent wetland to enhance function and <br /> increase tidal exchange potential; construct dikes supporting trail to Simpson Pad and <br /> abutting WSDOT property; armor outfall from flood &storm event erosion; construct curved <br /> Trestle Bridge to span new outfall, capable of supporting light maintenance vehicles; <br /> provide interpretive signage/stations on and off bridge; minimal site furnishings; realign <br /> portion of Riverfront Trail at bridge approach; provide new south Simpson/west Simpson <br /> perimeter trail from Riverfront Trail, with connector to Simpson Pad interior; restore <br /> disturbed landscape with native plantings. <br /> Estimated Area Costs Low High <br /> Earthwork $1,100,000. $2,760,000. <br /> Bank stabilization/enhan.,wetland creation/enhan. 750,000. 1,733,000. <br /> Utilities and lighting 0. 0. <br /> Drainage 21,000. 21,000. <br /> Structures 450,000. 750,000. <br /> Site furnishings and signage 100,000. 100,000. <br /> Pavement 0. 262,000. <br /> Soil preparation and planting 145,000. 213,500. <br /> Water Quality Improvement Facility 545.000. 545.000. <br /> Subtotal 3,111,000. 6,384,500. <br /> 10% Mobilization 311,100. 638,500. <br /> 20%Contingency 622200. 1,276,900. <br /> Subtotal 4,044,300. 8,299,900. <br /> 9.2% Sales tax 372,100. 763,600. <br /> 20% Engineering and Construction Admin. 754,400. 1,605,500. <br /> (excludes design of Water Quality Improvement Facility) <br /> TOTAL $5,170,800. $10,669,000. <br /> Page 4 of 9 <br /> 97 <br />