Appendix N Preliminary Design
Belfountain Dam and Headpond Class EA Preferred Alternative D4H5: Lower the spillway & backfill headpond & construct channel Preliminary Cost Estimate ITEM ITEM UNIT EST. UNIT TOTAL NO. QTY. PRICE General 1 Mobilization LS 1 $30,000 $30,000 2 Construction Access LS 1 $20,000 $20,000 3 Dewatering & Erosion & Sediment Controls LS 1 $100,000 $100,000 Subtotal General $150,000 Dam Works 4 Concrete removals m 3 80 $1,000 $80,000 5 New concrete m 3 42 $1,500 $63,000 6 Cobble surface finish m 2 30 $1,000 $30,000 7 Install shear anchors EA 12 $10,000 $120,000 8 Rehabilitate south abutment LS 1 $20,000 $20,000 9 Rehabilitation work (concrete, south abutment & north retaining wall toe erosion) LS 1 $50,000 $50,000 10 Public safety signage, fencing, etc. LS 1 $5,000 $5,000 Subtotal Dam $368,000 North Retaining Wall Mitigation 11 Impervious membrane m 2 50 $100 $5,000 12 Wall drains EA 14 $500 $7,000 13 Excavation and restoration LS 1 $5,000 $5,000 Subtotal North Retaining Wall $17,000 Headpond/Channel 14 Sediment removal and disposal m 3 2000 $50 $100,000 15 Fill borrow m 3 5000 $10 $50,000 16 Riffle stone tonne 900 $70 $63,000 17 Lunker EA 8 $500 $4,000 18 Vegetated stone tonne 1000 $80 $80,000 19 Vegetated block m 2 450 $10 $4,500 20 French drain m 190 $20 $3,800 21 Coir cloth m 65 $50 $3,250 22 Topsoil m 3 600 $30 $18,000 23 Floodplain planting and seeding m 2 2500 $20 $50,000 Subtotal Headpond/Channel $376,550 Other Structural 24 Rehabilitation of existing north terrace retaining walls m 90 $500 $45,000 25 Raise existing pool terrace retaining walls m 40 $500 $20,000 26 Headpond pedestrian bridge (18 m span) LS 1 $120,000 $120,000 27 Proposed boardwalk m 2 390 $600 $234,000 Subtotal Headpond/Channel $419,000 Subtotal $1,330,550 28 Engineering, Environmental, Landscaping Design (10%) $133,055 29 Contingency (25%) $332,638 30 HST (13%) $233,512 Total $2,029,754 ITEM NO. 1 2 3 4-6 Measured quantity 7 8 9 10 Allowance 11-13 Measured quantity Disposal as clean fill. Higher than average unit cost considering logistical issues (remove site; limited access/staging area may allow only 1 truck on site at 14 once) and material issues (possible need to mix with other bulk source to achieve engineering/environmental requirements). Assume majority of unconsolidated sediment (2500m3) is removed only. 15 16-23 Measured quantity 24 25 26 27 ASSUMPTIONS Allowance Allowance Allowance Unit cost of achors installed as part of investigation by Terraprobe (2013). Allowance. Work is completed while headpond is dewatered, if necessary Allowance Based on cut/fill balance (assumes consolidated sediment is reused as fill; unconsolidated is removed from the site) Allowance for concrete rehabilitation, and localized replacement where deterioration is advanced. Allowance for new concrete, rehabilitation, and localized replacement where deterioration is advanced. Prefabricated steel span plus abutments. Pedestrian and small vehicle loads only. 155 m long x 2.5 m wide
1 0+080 2 0+100 4 0+305 0+300 0+120 0+140 3 0+160 0+280 0+180 1 0+260 2 0+200 0+240 0+220 4 LEGEND 3 PROPOSED POOL PROPOSED RIFFLE PROPOSED COIR CLOTH BANK TREATMENT PROPOSED VEGETATED STONE BANK TREATMENT PROPOSED VEGETATED BLOCK BANK TREATMENT PROPOSED LUNKER BANK TREATMENT OPTIONAL FRENCH DRAIN SYSTEM PROPOSED FILL AREA EXISTING TREE EXISTING TRAIL
361 361 359 359 357 357 355 355 354 354 353 0+080 0+100 0+120 0+140 0+160 0+180 0+200 0+220 0+240 0+260 0+280 0+300 353 POND PROFILE SCALE HOR=1:300 VERT=1:150
30 20 Gravel Path Concrete Wall To Be Removed 1.50m 10 Vegetated stone XS1 1+30.00 16.00m Vegetated block Inv..41m ground Concrete Wall To Be Removed 0 10 20 30 30 Raise existing retaining wall to elev. 359.90m 'Pool' Terrace Stone Wall Top of existing retaining wall at terrace = 359.60m Concrete Wall 20 1.50m Grade out from top of bankfull at 1.30% min. -1.30% Fill existing pond with compacted native and imported material 10 Vegetated block Inv..59m XS3 1+83.00 Vegetated stone 16.00m Bankfull 1.06m 2.61m 1.5m Proposed Boardwalk Bed of channel to be compacted clean material. Imported material as required depending on future sediment quality testing ground Trail Grade to existing ground from top of bankfull at 2% min. 0 10 20 30 30 Wall Sidewalk 20 Wrapped Coir Cloth Bank Treatment Inv. 359.02m 10 XS2 1+53.47 16.00m Bankfull 0.75m Wrapped Coir Cloth Bank Treatment 1.50m ground Grade to existing ground from top of bankfull at 2% min. Fill existing pond with Proposed grade compacted native and control riffle imported material 0 10 20 30 Stone Wall 40 ground Concrete Wall 30 Grade to existing ground from top of bankfull at 2% min. Fill existing pond with compacted native and imported material 20 10 Vegetated block 8:1 XS4 2+60 Inv. 357.80m 20.50m Bankfull Bed of channel to be compacted clean material. Imported material as required depending on future sediment quality testing Vegetated stone 1.55m 1.50m Proposed Boardwalk 5.18 1.5m Fill existing pond with compacted native material Grade to existing ground from top of bankfull at 2% min. 0 10 20 30 Trail
PROPOSED IMPERVIOUS LAYER NATIVE TO FILL GRANULAR 'B' CONCRETE RETAINING WALL PROPOSED WALL DRAIN @ ±1.0m C/C FINE AGGREGATE CONCRETE INFERRED FROM GEORADAR DATA BEDROCK (MANITOULIN FORMATION) NORTH RETAINING WALL DETAIL COIR CLOTH BANK TREATMENT SEE DETAIL THIS SHEET SHRUB PLANTINGS OR LIVE CUTTINGS DEPENDING ON SEASON Coir Cloth Bank Treatment N.T.S. Live stakes STONE SIZE MAY DECREASE TOWARDS TOP OF BANK TOPSOIL MIX ANGULAR STONE MIX (LARGEST STONES CONCENTRATED AT TOE OF BANK) Mix of topsoil and native materials to be wrapped with coir cloth and well compacted to form banks TOPSOIL PLANTING MEDIUM MUST BE IN CONTACT WITH NATIVE BANK MATERIAL PROPOSED CHANNEL BED 1 1 4 1 THICKNESS OF PROTECTION STONE TO BE 2 x D84 STONE TO BE KEYED INTO CHANNEL BED A MINIMUM OF 75% OF MAXIMUM STONE DIAMETER Minimum of 1m past wet edge of for both sides of the banks VEGETATED BLOCK DETAIL N.T.S. VEGETATED ANGULAR STONE DETAIL N.T.S.
LEGEND PROPOSED NATURALIZED FLOODPLAIN AREA PROPOSED RIPARIAN BUFFER PROPOSED RECREATIONAL GREENSPACE EXISTING TREE EXISTING TRAIL HAZARD WARNING SIGNAGE CULTURAL HERITAGE INTERPRETIVE SIGNAGE PROPOSED FENCE
CONSTRUCTION NORTH TP114113 S1 S3
TP114113 S2 S3
TP114113 S3 S3