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TABLE 1
<br />STORMWATER FACILITIES
<br />ESTIMATED CONSTRUCTION COSTS PER UNIT
<br />Stormwater Facility Type
<br />Unit
<br />S/Unie "` i +z
<br />Description of Stormwater Facility Construction Activities
<br />Trash Rack Inlet (Type 1)
<br />EA
<br />$5,940
<br />Cone shaped rebar cage bolted to an inlet structure (manhole or vault), inlet protection
<br />(riprap, geotextile fabric), clearing of invasive vegetation, grading and revegetation .
<br />Trash Rack Inlet (Type 2)
<br />EA
<br />$9,970
<br />Steel trash rack approximately 15 It wide and 4 It high placed in the channel with concrete
<br />foundation walls on both banks. Also includes inlet protection, clearing of invasive vegetation,
<br />grading and revegetation.
<br />Garbage and Debris Removal
<br />CY
<br />$120
<br />Hand collected debris not requiring mechanical means to lift, hauled in 10 CY truck to disposal.
<br />Sediment Removal
<br />CY
<br />$250
<br />Removal of sediment from channels and culverts with heavy equipment. Includes
<br />hydroseeding for revegetation.
<br />Streambank Stabilization
<br />SY
<br />$90
<br />Grading, geotextile, toe reinforcement, revegetation and erosion control.
<br />Open Channel Improvements (Type 1)
<br />LF
<br />$350
<br />Traffic control, excavation (0 tol 0 It bottom width, 4 to 6 It depth, 3:1 side slopes),
<br />hydroseed, erosion protection at inlet and outlet Modification of existing channel.
<br />Open Channel Improvements (Type 2P
<br />LF
<br />$730
<br />Same as above except 10 to 20 It bottom width, 6 to 10 It depth.
<br />Dry Extended Pond
<br />Ac -Ft
<br />$59,700
<br />Gravel access road (25 It long x 12 It width), clearing & grubbing, excavation (3 It depth),
<br />grading, erosion protection at inlet & outlet, hydroseed, trees & shrubs, safety fence,
<br />erosion control.
<br />Wet Extended Pond
<br />Ac -Ft
<br />$59,700
<br />Gravel access road (25 It long x 12 It width), clearing & grubbing, excavation (3 -6 It depth),
<br />grading, erosion protection at inlet & outlet, hydroseed, trees & shrubs, safety fence,
<br />erosion control. No lining has been included.
<br />Stormwater Marsh/Wetland
<br />AC
<br />$88,300
<br />Gravel access road (25 It long x 12 It width), grading (1 -2 It depth, no removal from site),
<br />erosion protection at inlet & outlet, hydroseed, vegetation and erosion control.
<br />Flood Control Facility
<br />Ac -Ft
<br />$59,700
<br />Gravel access road (25 It long x 12 It width), clearing & grubbing, excavation (3 It depth),
<br />grading, erosion protection at inlet & outlet, hydroseed, trees & shrubs, safety fence,
<br />erosion control.
<br />Outfall Protection
<br />EA
<br />$7,670
<br />Precast concrete outlet structure, erosion protection, geotextile fabric, clearing of vegetation
<br />around structure, grading and revegetation.
<br />Vegetated Swale
<br />LF
<br />$17
<br />Traffic control, clearing & grubbing, excavation (4ft bottom width, 2 It depth, 4:1
<br />side slopes), hydroseed, erosion protection at inlet and outlet
<br />Infiltration Trench
<br />LF
<br />$50
<br />Clearing & grubbing, excavation (2ft bottom width, 4 It depth), geotextile fabric,
<br />4 " -8" perforated pipe, drain rock, and hydroseed.
<br />Natural Resource Enhancemene -3
<br />SY
<br />$10
<br />Add additional vegetation
<br />Natural Resource Revegetation
<br />SY
<br />$56
<br />Remove invasive vegetation, grade and revegetate.
<br />Recreational Trail
<br />SF
<br />$5
<br />Clearing & grubbing, grading (up to 1 It depth), erosion control, cedar shavings.
<br />Does not include storm drainage, signage, benches or other recreational amenities.
<br />Raingarden - Native Soils N -5
<br />SF
<br />$8
<br />Includes installation of plants.
<br />Does not include grading, curb work, and sod installation outside of garden area.
<br />Rain garden - Engineered Soils N -6
<br />g g
<br />SF
<br />$29
<br />Includes installation of plants, bed amendment with engineered soils), and underdrain piping.
<br />P ( g ) P P g.
<br />Does not include grading, curb work, and sod installation outside of garden area.
<br />Note 1: The costs in this table reflect an update of the original Table 1 prepared in 1999. It is based on a 2007 update that included an accross the board increase of 15% to all unit costs in Table 7. It
<br />also includes the inclusion of geotextile fabric for both types of open channel improvements (see update to Table 7).
<br />Note 2: Construction costs presented in this table are planning level estimates. They are reflective of average facilities constructed under typical conditions. Each facility will vary depending on site
<br />conditions, the size and number of facilities constructed, and depending on the local construction market at the time of bidding. Contingencies should be reflected for budgeting purposes based on the
<br />variety of possible conditions.
<br />Note 3: For purposes of calculating costs, these 2 categories have been combined and called Natural Resource Enhancement (use $13 /sy) see attached addendum dated 11 /01. This $13 /sy should be
<br />updated to $15 /sq based on the 15% increase being applied for a 2007 update.
<br />Note 4: The cost presented here for TYPE II channel improvements of $730 reflects a 2007 accross the board update of +15% to the costs in the 1999 tables. However, due to several years experience
<br />with this type of project and an expectation of economies of scale (e.g., wider bottom width, deeper excavation, but same start up /mobilization/erosion control costs, etc.), an amount of $600/LF is now
<br />used as the unit cost here.
<br />Note 5: Native soil mingarden cost estimates are assumed for 2007 and were provided by David Dods at URS (Overland Park, Kansas) , email dated 9 -21 -2007 and approved by Eugene and Lane
<br />County staff. See attached email.
<br />Note 6: Engineered soil raingarden cost estimates are estimated for 2007, based on information provided by David Dods at URS (Overland Park, Kansas) , email dated 9 -21 -2007, and information
<br />provided by the City of Portland (phone call with City 8- 10 -09). The two costs provided ($24 /sf from Kansas City and $34 /sf from Portland) were averaged to take into account the fact that the Kansas
<br />City estimate was assumed to be on the low side when compared to typical costs in Eugene, and the City of Portlands estimate was on the high side given that it reflected 2009 costs as opposed to 2007.
<br />To be consistent with the other unit costs in these tables, unit costs should reflect 2007 estimates.
<br />Reference:
<br />Table 1 summarizes data in Table 7.
<br />Table 5 (Unit Cost) x Table 6 (Quantities) = Table 7 (Unit Cost per CIP Type)
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