PROJECT SCOPE OF WORK CITY OF TOWN AND COUNTRY STORMWATER PROGRAM

Transcription

1 PROJECT SCOPE OF WORK CITY OF TOWN AND COUNTRY STORMWATER PROGRAM Project ID Number: 1-1 Problem: The 1-foot long reach of stream between S. Mason Road and 11 Cross Land Drive is downcutting and causing bank erosion. Thick honeysuckle dominates the vegetation on both banks. The stream is cluttered with discarded trash, yard residue, and fallen vegetation. The discharge pad at the upstream flared end section at 148 Kings Glen Drive is damaged from erosion and pieces of the structure have broken. Creek erosion is threatening the pool at 11 Cross Land Drive and a fence at 141 Kings Glen Drive. Proposed Solution: Stabilize the creek reach with bank protection/biostabilization in two locations: near 141 Kings Glen Dr & 17 Cross Land Dr as well as on 11 Cross Land Dr. Install grade controls at 8- to 16-ft intervals in the stream to slow downcutting of the stream. At the bank protection locations, native vegetation should be established at the top of the slope and invasive species should be removed from the entire area. Required Easements: 11 Cross Land Drive (Temporary Construction Easement) 1 Cross Land Drive (Temporary Construction Easement) 14 Cross Land Drive (Temporary Construction Easement) 148 Cross Land Drive (Temporary Construction Easement) 17 Cross Land Drive (Temporary Construction Easement) 141 Kings Glen Drive (Temporary Construction Easement) 14 Kings Glen Drive (Temporary Construction Easement) 148 Kings Glen Drive (Temporary Construction Easement) 1 S. Mason Road (Temporary Construction Easement) 18 S. Mason Road (Temporary Construction Easement) 1 S. Mason Road (Temporary Construction Easement) 7 Lochinvar Drive (Temporary Construction Easement) Lochinvar Drive (Temporary Construction Easement) Lochinvar Drive (Temporary Construction Easement) Commentary: Average reach slope is approximately.% (typical stable slope is. to.7%). Bank full depth is approximately ft and the entrenched depth is 6 ft. Bed width is approximately 8-feet wide. Twoinch cobble armor the bed. Limited improvements to the area are proposed in order to reduce the disturbance to the area. Many residents enjoy the screening that the thick vegetation provides. Large-scale bank stabilization would require much of that vegetation to be torn out. If residents are amenable to losing their screening, more extensive bank stabilization measures may be constructed. Significant downcutting has occurred along the reach. In addition to local bank stabilization improvements, the entire reach should be assessed in more detail to ensure a geomorphically stable channel design under a variety of flow conditions. Solutions such as raising the channel bed to reconnect it to the natural floodplain may be considered. PROJECT SCOPE OF WORK

2 PROJECT INFORMATION SUMMARY CITY OF TOWN AND COUNTRY STORMWATER PROGRAM Project ID Number: 1-1 Number of Properties Impacted: Number of Easements Required: Number of Properties Benefited: Opinion of Probable Construction Cost (OPC): (LBI) Project Points: $1,7. 9. Project Source: x Citizen Complaint Municipality Government Agency Category of Problem: Description Cost to Benefit Ratio: 1,86 Coordination Required: x MSD x Corps of Engineers x MO DNR MODOT County Highways City s City Parks County Parks x Municipality: City of Town & Country Railroad: x : Attached Supplemental Information: x Project Scope of Work x Conceptual Plan Drawing x Itemized Opinion of Probable Construction Cost (OPC) x (LBI) Forms x Existing Condition Photos A: Frequent structural flooding from creeks or rivers (floodplain) B: Frequent structural flooding from overland flow (non-floodplain) C: Frequent roadway flooding D: Infrequent structural flooding from creeks or rivers (floodplain) E: Infrequent structural flooding from overland flow (non-floodplain) F: Infrequent roadway flooding G: High risk structural erosion H: High risk roadway erosion x I: erosion x J: Moderate risk structural erosion K: Moderate risk roadway erosion L: or flooding of common ground or unmaintained area M: flooding N: from inadequate sinkhole O: from inadequate roadway drainage P: of stormwater system facilities Q: Notes: MSD/MO American Water Base Map Number(s): FEMA FIR Map Number(s): P4 9189C1K PROJECT INFORMATION SUMMARY

3 OPINION OF PROBABLE CONSTRUCTION COST CITY OF TOWN AND COUNTRY STORMWATER PROGRAM Project ID Number: 1-1 ITEM ESTIMATED UNIT EXTENDED NUMBER PAY ITEM DESCRIPTION QUANTITY UNIT PRICE PRICE 1 Mobilization 1 Lump Sum $1,81.8 $1,81.8 Bank Protection - Biostabilization 18 Square s $6. $1,98. Clearing 1 Lump Sum $1,. $1,. 4 Excavation Class "B" 9 Cubic s $. $,4. Excavation Class "C" 177 Cubic s $8. $4,96. 6 Grade Control 114 Cubic s $1. $17,1. 7 Rock Toe Protection 48 Square s $11. $,. 8 Seeding & Live Staking 18 Square s $4. $8,. 9 Sodding - Fescue 6 Square s $11. $,99. 1 Protection and Restoration of Site 1 Lump Sum $8,19.8 $8,19.8 SUB-TOTAL - CONSTRUCTION: $7,.46 Estimated Engineering Fee: $,. Estimated Geotechnical Engineering Fee: $6,. Estimated Property Survey/Strip Map Preparation Fee: $8,4. Estimated Property Title/Easement Search Report Fee: $6,. Estimated Topographic Survey Fee: $17,6. Estimated Property Rights Acquisition Document Preparation Fee: $6,. Estimated Cost of Easements: $14,. Estimated Construction Survey Fee: $1,. SUB-TOTAL: $14,67.46 % Contingency: $46,4.4 TOTAL: $1,7. OPINION OF PROBABLE CONSTRUCTION COST

4 Project Id Number: Cross Land Dr Total Calculated : 1.7 ROW 1 (Pool) 1 Subtotal 14 Subtotal Unimproved Channel Gutter Subtotal > 1 1 / years Property Value.1 1 / 1 years Life / Limb Multiplier 1 Multiplier.1

5 Project Id Number: Cross Land Dr Total Calculated :. ROW 1 Subtotal Subtotal Unimproved Channel Gutter Subtotal > 1 1 / years Property Value.1 1 / 1 years Life / Limb Multiplier 1 Multiplier.1

6 Project Id Number: Cross Land Dr Total Calculated :. ROW 1 Subtotal Subtotal Unimproved Channel Gutter Subtotal > 1 Life / Limb 1 / years Property Value.1 1 / 1 years Multiplier 1 Multiplier.1

7 Project Id Number: Cross Land Dr Total Calculated :. ROW 1 Subtotal Subtotal Unimproved Channel Gutter Subtotal > 1 Life / Limb 1 / years Property Value.1 1 / 1 years Multiplier 1 Multiplier.1

8 Project Id Number: Cross Land Dr Total Calculated :. ROW 1 Subtotal Subtotal Unimproved Channel Gutter Subtotal > 1 Life / Limb 1 / years Property Value.1 1 / 1 years Multiplier 1 Multiplier.1

9 Project Id Number: Kings Glen Dr Total Calculated :.6 ROW 1 (Fence) 1 Subtotal Subtotal Unimproved Channel Gutter Subtotal > 1 1 / years Property Value.1 1 / 1 years Life / Limb Multiplier 1 Multiplier.1

10 Project Id Number: Kings Glen Dr Total Calculated :. ROW 1 Subtotal Subtotal Unimproved Channel Gutter Subtotal > 1 Life / Limb 1 / years Property Value.1 1 / 1 years Multiplier 1 Multiplier.1

11 Project Id Number: Kings Glen Dr Total Calculated : 1.7 ROW 6 1 Subtotal 8 Subtotal 6 Unimproved Channel Gutter Subtotal 9 > 1 1 / years Property Value.1 1 / 1 years Life / Limb Multiplier 1 Multiplier.1

12 Project Id Number: S. Mason Rd Total Calculated :. ROW 1 Subtotal Subtotal Unimproved Channel Gutter Subtotal > 1 Life / Limb 1 / years Property Value.1 1 / 1 years Multiplier 1 Multiplier.1

13 Project Id Number: S. Mason Rd Total Calculated :. ROW 1 Subtotal Subtotal Unimproved Channel Gutter Subtotal > 1 Life / Limb 1 / years Property Value.1 1 / 1 years Multiplier 1 Multiplier.1

14 Project Id Number: S. Mason Rd Total Calculated :. ROW 1 Subtotal Subtotal Unimproved Channel Gutter Subtotal > 1 Life / Limb 1 / years Property Value.1 1 / 1 years Multiplier 1 Multiplier.1

15 Project Id Number: Lochinvar Dr Total Calculated :.6 ROW 1 Subtotal Subtotal Unimproved Channel Gutter Subtotal 1 1 > 1 Life / Limb 1 / years Property Value.1 1 / 1 years Multiplier 1 Multiplier.1

16 Project Id Number: 1-1 Lochinvar Dr Total Calculated :.6 ROW 1 Subtotal Subtotal Unimproved Channel Gutter Subtotal 1 1 > 1 Life / Limb 1 / years Property Value.1 1 / 1 years Multiplier 1 Multiplier.1

17 1-1 Typical stream reach near upstream outlet structure. (1) Outlet structure near 148 Kings Glen Drive. (1) Debris in stream. (1) Typical stream segment. (1) Many roots have had soil washed away around them. (1) Concrete debris in stream. (1)

18 1-1 Looking upstream, black residue in stream shown Streambank erosion near fence at 141 Kings Glen Drive. (1) of yard between 141 & 17 Cross Land Drive. Homeowner has placed rock to stabilize; rock has stayed in place thus far. (18)

19 '' 14 P4-4D V U 6 1'' P4-19S LA N D DR 14 4'' 8 4 '' 9 P4-88D 6 P4-9D 18 '' P4-91D 1'' 4 P4-14D 1'' P4-87D '' Cross Land Dr P-41D 8 P4-177S City of Town & Country Stormwater Program 6 P4-7S 9 1'' P4-179S Install grade controls and bank stabilization. P-4D 6 4'' 8 '' 48 Proposed Solution Description 14 P4-89D P4-97D Stream downcutting and creekbank erosion threatening yards and fences P4-178S P4-49D $1,76 1,86 Problem Description '' 8 4 '' P4-18S 8 1 1'' P4-94D P4-47D 7 1'' LOCHINVAR D R P4-46D 1'' P4-76S 9 P4-1D P4-9D P4-9D P4-1D 1'' P4-48D P4-98D 9 Easements Required Properties Impacted Properties Benefited Project Conceptual Cost Cost to Benefit Ratio '' 1.% Annual Chance Flood Hazard O SS 7 9 CR 6 7 P4-1D 1.% Annual Chance Flood Hazard 1 P4-4D '' P4-11D FEMA Flood Hazard Zone '' Proposed Improvements Topo Limits '' Proposed Pavement Regulatory Floodway P4-17S 1 Stormwater Gravity Main Strip Map Limits 111 P4-1S 141 Stormwater Intake/Outfall Impervious 6 P4-44D 61 Stormwater Manhole Parcels P4-8S P4-4D P4-D 6 Stormwater Inlet Sanitary Gravity Main Stormwater Channel '' 6'' P4-1S " ), % Sanitary Manhole ft Contours, % # * '' 9 14 Existing P-18D P4-77S P4-78S P4-D '' 1 P4-41D 1'' P4-4D '' P4-8D P4-16S 6 P4-4D 6 V U 7'' 64 KIN EN DR GS GL 1'' '' 61 U V '' Project Location P4-176S 1 Feet 1 inch = 1 feet Warning: If this bar does not measure 1" then drawing is not to scale 1-1