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 Name: 1 Ridge Creek Rd Bank Stabilization Project ID Number: Problem: The resident of 1 Ridge Creek Road has indicated continued erosion of the embankment at his property as well as the adjacent properties. In particular, an existing railroad tie wall at 3 Wyndmoor Terrace Court is deteriorating due to instability and erosion. The eventual collapse of the wall could be a significant threat to the yard or structure at 3 Wyndmoor Terrace Court. Proposed Solution: Install a combination of hard armor, vegetated stabilization, and grade controls to halt erosion of the creek bank from downcutting and surface runoff. Remove the existing railroad tie wall, regrade the slope, and reinforce with vegetated stabilization. Description of Proposed Alignment: Repair localized erosion of stream bank on 1 Ridge Creek from overland flow coming from between the lots. Vegetation should be established at top of bank in areas where turf is currently maintained to the top of bank. Plant areas with shrubs or trees of appropriate varieties. Install grade controls at the upstream and downstream ends of improvements, as well as at the outfall of the existing 2-in pipe coming from Wyndmoor Terrace Court. Required Easements: 1 Ridge Creek Road (Temporary Construction Easement) 1 Ridge Creek Road (Temporary Construction Easement) 3 Wyndmoor Terrace Court (Temporary Construction Easement) 3 Wyndmoor Terrace Court (Temporary Construction Easement) Commentary: Minor grading in yards may help. Consider extending drainage pipe to stream, or constructing headwall on end of pipe to resist erosion. PROJECT SCOPE OF WORK

2 PROJECT SUMMARY CITY OF TOWN AND COUNTRY STORMWATER PROGRAM Project Name: 1 Ridge Creek Rd Bank Stabilization Project ID Number: Number of Properties Impacted: Number of Easements Required: Number of Properties Benefited: Opinion of Probable Construction Cost (OPC): Location Benefit Identification (LBI) Project Points: Cost to Benefit Ratio: Coordination Required: $12, ,27 Project Source: x Citizen Complaint Municipality Maintenance Government Agency Category of Problem: Description A: Frequent structural flooding from creeks or rivers (floodplain) B: Frequent structural flooding from overland flow (non-floodplain) C: Frequent roadway flooding x MSD x Corps of Engineers x MO DNR MODOT County Highways City Streets City Parks County Parks x Municipality: City of Town & Country Railroad: : Attached Supplemental Information: x Project Scope of Work x Conceptual Plan Drawing x Itemized Opinion of Probable Construction Cost (OPC) x Location Benefit Identification (LBI) Forms x Existing Condition Photos 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: Yard erosion x J: Moderate risk structural erosion K: Moderate risk roadway erosion L: Erosion or flooding of common ground or unmaintained area x M: Yard flooding N: Flooding from inadequate sinkhole O: Flooding from inadequate roadway drainage P: Maintenance of stormwater system facilities Q: Notes: MSD/MO American Water Base Map Number(s): FEMA FIR Map Number(s): 18P 29189C163H PROJECT SUMMARY

3 OPINION OF PROBABLE CONSTRUCTION COST CITY OF TOWN AND COUNTRY STORMWATER PROGRAM Project Name: 1 Ridge Creek Rd Bank Stabilization Project ID Number: ITEM ESTIMATED UNIT EXTENDED NUMBER PAY ITEM DESCRIPTION QUANTITY UNIT PRICE PRICE 1 Mobilization 1 Lump Sum $1,632. $1, Excavation Class "C" 218 Cubic Yards $28. $6,1. 3 Grade Control 92 Square Yards $1. $13,8. Granular Backfill (Under Planted Rock Slope) Cubic Yards $. $27. Clearing 1 Lump Sum $,. $,. 6 Compaction of Fill 3 Cubic Yards $22. $66. 7 Bank Protection - Biostabilization 297 Square Yards $6. $17,82. 8 Seeding & Live Staking Square Yards $. $2,2. 9 Sodding - Fescue 7 Square Yards $13. $9,1. 1 Protection and Restoration of Site 1 Lump Sum $7,73.9 $7,73.9 SUB-TOTAL - CONSTRUCTION: $63,121. Estimated Engineering Fee: $23,. Estimated Geotechnical Engineering Fee: $. Estimated Property Survey/Strip Map Preparation Fee: $1,8. Estimated Property Title/Easement Search Report Fee: $8. Estimated Topographic Survey Fee: $1,. Estimated Property Rights Acquisition Document Preparation Fee: $1,8. Estimated Cost of Easements: $,. Estimated Construction Survey Fee: $6. SUB-TOTAL: $96,121. 3% Contingency: $28,836.2 TOTAL: $12,97.82 OPINION OF PROBABLE CONSTRUCTION COST

4 City of Town & Country Location Benefit Identification Project Name: 1 Ridge Creek Rd Bank Stabilization Project Id Number: Location Address / Description: 1 Ridge Creek Rd Total Calculated Benefit Points: 1.7 Evaluation Category Problem Type Benefit Points High Medium Low Retaining Wall (Public) Street ROW Retaining Wall (Private) Yard 3 (Accessory Structure) 3 Erosion Erosion Subtotal 9 Impassable Traffic Passable Traffic Accessory Structure 1 Yard 3 Flooding Flooding Subtotal Maintenance Street Gutter Swale / Berm Maintenance Subtotal 3 Street Drainage Drainage Subtotal 1 >1 / year 1 1 / year 1 / years Property Value.1 1 / 1 years Frequency Rating Life / Limb Health Degree of Risk Frequency Rating Multiplier 1 Degree of Risk Multiplier.1

5 City of Town & Country Location Benefit Identification Project Name: 1 Ridge Creek Rd Bank Stabilization Project Id Number: Location Address / Description: 1 Ridge Creek Rd Total Calculated Benefit Points: 1.1 Evaluation Category Problem Type Benefit Points High Medium Low Retaining Wall (Public) Street ROW Retaining Wall (Private) Yard 3 Erosion Erosion Subtotal 6 Impassable Traffic Passable Traffic Accessory Structure Flooding Flooding Subtotal 1 Maintenance Street Gutter Swale / Berm Maintenance Subtotal 3 Street Drainage Drainage Subtotal 1 Frequency Rating Degree of Risk >1 / year 1 Life / Limb 1 / year Health 1 / years Property Value.1 1 / 1 years Frequency Rating Multiplier 1 Degree of Risk Multiplier.1

6 City of Town & Country Location Benefit Identification Project Name: 1 Ridge Creek Rd Bank Stabilization Project Id Number: Location Address / Description: 3 Wyndmoor Terrace Ct Total Calculated Benefit Points:.7 Evaluation Category Problem Type Benefit Points High Medium Low Retaining Wall (Public) Street ROW 3 Retaining Wall (Private) 18 6 Yard 3 Erosion Erosion Subtotal 38 Flooding Impassable Traffic Passable Traffic Accessory Structure Yard Flooding Subtotal 2 6 Maintenance Unimproved Channel Street Gutter Swale / Berm Maintenance Subtotal 8 Street Drainage Drainage Subtotal 1 Frequency Rating Degree of Risk >1 / year 1 Life / Limb 1 / year Health 1 / years Property Value.1 1 / 1 years Frequency Rating Multiplier 1 Degree of Risk Multiplier.1

7 City of Town & Country Location Benefit Identification Project Name: 1 Ridge Creek Rd Bank Stabilization Project Id Number: Location Address / Description: 3 Wyndmoor Terrace Ct Total Calculated Benefit Points:.6 Evaluation Category Problem Type Benefit Points High Medium Low Retaining Wall (Public) Street ROW Retaining Wall (Private) Unimproved Channel 1 Erosion Erosion Subtotal 2 Flooding Impassable Traffic Passable Traffic Accessory Structure Yard Flooding Subtotal Maintenance Street Gutter Swale / Berm Maintenance Subtotal 3 Street Drainage Drainage Subtotal 1 Frequency Rating Degree of Risk >1 / year 1 Life / Limb 1 / year Health 1 / years Property Value.1 1 / 1 years Frequency Rating Multiplier 1 Degree of Risk Multiplier.1

8 21-11 Deep erosion to channel behind 1 Ridgecreek Rd. Left: 212. Right: 216. Vertical channel bank behind 1 Ridgecreek Rd. (21)

9 21-11 Upstream channel, behind 1 Ridgecreek Rd. (216) Looking north (downstream) behind 1 Ridgecreek Dr. Shows 2-in CMP. CMP discharges stormwater collected from Wyndmoor Terrace Ct, Bryn Wyck Pl, and Doulton Pl, which are located south and southwest. (216) Looking northeast toward 1 Ridgecreek Rd. (212)

10 Ridgecreek Rd property line, leading to channel behind properties. (212) 1-1 Ridgecreek Rd property line, leading to channel behind properties. (216)

11 Project Location U V 3 12 Existing 1-ft Contours P-7S 1 K 18P-7D 3 V U Proposed 18P-8D 2 Strip Map Limits 18P-9S 3 Proposed Improvements BRYN WY P-61S 18P-7D P-69D 12 18P-66S P-17D 18P-6S P-93S P-68S 8' ' 8 Feet 1 inch = 8 feet Warning: If this bar does not measure 1" then drawing is not to scale 1 Ridgecreek Rd Bank Stabilization P-67S P-81D 18P-78D 18P-9S 1 18P-2S Problem Description City of Town & Country Stormwater Program 18P-113D ' 8' 18P-18D 8.1 $12,98 1,27 Remove railroad tie wall and install grade control and bank stabilization P-71S 31.2% Annual Chance Flood Hazard Proposed Solution Description 8' ' P-7S 18P-72S P-9S 21 18P-19D 1 18P-11D 1.% Annual Chance Flood Hazard Degradation of an existing railroad tie wall is unstable and may fail. 18P-9S 18P-1S CK PL P-7D FEMA Flood Hazard Zone Easements Required Properties Impacted Properties Benefited Project Benefit Points Conceptual Cost Cost to Benefit Ratio 18P-111D 322 Topo Limits Regulatory Floodway 18P-8D Stormwater Gravity Main Pavement 18P-112D 1 Stormwater Intake/Outfall Impervious 18P-89S 18P-8D Stormwater Manhole Parcels 18P-73S 31 Sanitary Gravity Main Stormwater Channel Stormwater Inlet # * RD 18P-8S 12 " ), % E RE EC 18P-39S 1 11 DG RI 1 V U 33 Sanitary Manhole , % 21-11