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Home My WebLink AboutPWC Agenda 2024-09-17 and PacketAGENDA PUBLIC WORKS COMMITTEE September 17th, 2024, 9:00 a.m. ZOOM Link: https://us06web.zoom.us/j/81695207215 1. Approval of Minutes a. August 20, 2024 2. Member Comments/Concerns a. Consider Modifications to Agenda 3. Gibbs Cemetery (Bostwick Rd) 4. Green Fleet Policy Joe/Hilary 5. Sewer Agreements 6. Town Board Tour 7. Project Updates – a. Streetlights b. CIP Update c. OpenGov – Asset Management d. King Rd West Culvert e. PWF MEP Updates f. TH Clerks/Mezz Update g. Town Hall Weatherization h. Ridgecrest Water Main Project i. Site Design Manual Barton & Loguidice W. King Rd - Design Memo (ID 3177881) Memo To: David O’Shea, P.E. Director of Engineering Town of Ithaca Date:September 13, 2024 From:Wendell Buckman, P.E. Barton & Loguidice, D.P.C. Project No.: 2071.011 Re:Alternative Analysis Memo King Road West Background: This memorandum serves to detail the Alternative Analysis for the repair of the culvert carrying King Road West over an Unnamed Stream in the Town of Ithaca, Tompkins County, NY. The existing crossing consists of a 5’ x 5’- 2” concrete box culvert. The downstream fascia and wingwalls have separated from the main box likely due to the hydraulic pressure from the surrounding soils. There is a large scour pocket behind the east downstream wingwall where water drains from a roadside drainage ditch into and impacting the backside of the wingwall, causing scouring and separation of the wingwall from the main box. The upstream wingwalls show advanced spalling.The fascias and interior of the box show minor isolated efflorescence from moisture penetration but are still of sound concrete. The intent of the project is to address the deterioration of the downstream fascia and repair the upstream wingwalls to increase the lifespan of the existing culvert Inspection: An inspection of the existing culvert was conducted on Thursday July 18th, 2024 to determine the extent of deterioration. The face of the upstream wingwalls were widely spalled. Throughout the interior of the culvert, there were a few isolated locations of efflorescence along the top and walls, as well as calcification at the construction joints. The majority of the interior was of sound concrete and not to be of any structural concern. The downstream fascia and wingwalls were found to be separated from the main box and completely failed. Behind the east downstream wingwall, there is a large scour pocket where water from a concrete drain along King Road West drains into and during high volume rain events, water rushes into the back of the wingwall. This has caused it to scour and is likely the cause of separation from the main box. Hydrology/Hydraulics: A hydrologic/hydraulic analysis has been completed on the Unnamed Stream and the concrete drainage ditch along King Road West. Unnamed Stream: The hydraulic analysis of the Unnamed Stream was conducted using HY-8 modeling software and the design criteria in the NYSDOT Highway Design Manual Chapter 8. Design flows were determined using StreamStats data and increased by 10% in accordance with NYSDOT Hydraulic Design Criteria for NYSDOT Region 3, Tompkins County. Analysis of the existing crossing results in a 50-year flood elevation 7.35 ft above the invert, providing an AHW/D ratio of 1.42. The 100-year flood elevation is 9.14 ft above the invert, which results in -4.14 ft of freeboard. The existing culvert does not meet NYSDOT’s hydraulic requirement of having an AHW/D maximum of 1. Hydraulics are not a controlling factor for the proposed work as the structure is not being replaced. David O’Shea Town of Ithaca September 13, 2024 Page 2 W. King Rd - Design Memo (ID 3177881) A desktop review of the surrounding buildings/structures using LiDAR indicates that the nearest structure to the culvert is approximately 20 feet above the invert of the culvert and will not be impacted by the 100-year flood event. Drainage Ditch: The hydraulic analysis of the drainage ditch was conducted using TR-55 methodology and determined the calculated flows, which are shown below. The drainage area of the ditch will be further analyzed during the design process. Storm Event 2-year 10-year 50-year Peak Flow (cfs)13.82 29.91 48.62 Time of Concentration:45 minutes CN:83 Alternative Analysis: Three alternatives were evaluated to determine the best solution. Rehabilitation: The alternative of rehabilitating the culvert would involve refacing the upstream wingwalls and replacing the downstream fascia and wingwalls. The downstream fascia and wingwalls would be removed back to the next construction joint, approximately 14 ft, and replaced with a new concrete section 6 ft from the construction joint with 45° wingwalls coming off the fascia and tying into the existing bedrock fascia. The drainage ditch would be regraded into a catch basin placed in the scour area behind the east wingwall and outlet through the back of the wingwall. Check dams would be placed along the length of the concrete drainage ditch to slow the flow of the water before entering the catch basin. It is estimated that this alternative would cost approximately $291,590. Slip-Line: The alternative of slip-lining the culvert would involve the same work as the rehabilitation alternative as well as also utilizing a Glass Reinforced Plastic Liner or similar composite system to line the interior of the culvert. Due to the varying geometry of the culvert, this system would be custom produced for this culvert. The interior of the culvert is generally in fair condition, therefore a full slip-line alternative is not determined to be advantageous to the Town. In addition, the structure is already hydraulically undersized. Therefore, any reduction in open area is not desired. It is estimated that this alternative would cost approximately $530,790. Replacement: The alternative of replacing the culvert entirely would involve closing the road and excavating down to bedrock, removing the existing culvert and replacing it with a new culvert that would meet hydraulic standards. Along with this alternative, the drainage ditch would be regraded into a catch basin placed in the scour area behind the east wingwall and outlet through the back of the wingwall. Check dams would be placed along the length of the concrete drainage ditch to slow the flow of the water before entering the catch basin. This alternative would have the highest cost compared to the other alternatives. In David O’Shea Town of Ithaca September 13, 2024 Page 3 W. King Rd - Design Memo (ID 3177881) addition, the roadway would be closed during construction, impacting residents. It is estimated that this alternative would cost approximately $1.2M. Recommendation: Our recommendation is to rehabilitate the culvert, as it presents the best cost-to-benefit ratio compared to the other alternatives. The replacement alternative would increase the service life of the culvert and improve the hydraulic capacity compared to the existing culvert, but it comes with a high a construction cost and greater impact to residents. A majority of the length of the culvert is still in good condition, and the culvert has no history of flooding. The slip-lining alternative would structurally line the existing culvert, however this alternative would decrease the hydraulic capacity of the structure. Due to the condition of the main barrel of the culvert, a slip-line alternative is not recommended. The Rehabilitation Alternative addresses the structural and drainage needs of the project at the most effective cost, therefore it is the preferred alternative. Work Zone Traffic Control: The west-bound lane will be closed over the culvert crossing during construction. Traffic will be maintained using a single lane of alternating traffic controlled by temporary traffic signals throughout the duration of construction. Right-of-Way: The existing culvert extends past the highway boundary and will require temporary easements. It is anticipated that the Town will obtain releases to complete this work. A detailed plan outlining the area of disturbance will be prepared during final design to present to the adjacent landowners. Environmental & Permitting: Based on a desktop environmental review, the following permits will be required for construction for all three of the alternatives: 1.NYSDEC Water Quality Certification 2.NYSDEC Stream Disturbance 3.ACOE NWP #3 KTR/ Item Number Item Quantity Unit Unit Cost Total Cost 201.06 CLEARING AND GRUBBING 1 LS 12,000.00$12,000.00$ 203.21 SELECT STRUCTURE FILL 530 CY 65.00$34,450.00$ 553.030001 TEMPORARY WATERWAY DIVERSION STRUCTURE 1 LS 5,000.00$5,000.00$ 555.97130016 STRUCTURAL CONCRETE 20 CY 1,500.00$30,000.00$ 580.01 REMOVAL OF STRUCTURAL CONCRETE 25 CY 500.00$12,500.00$ 595.50000018 SHEET-APPLIED WATERPROOFING MEMBRANE 50 SF 6.00$300.00$ 603.9824 SMOOTH INTERIOR CORRUGATED POLYETHYLENE CULVERT AND STORMDRAIN 24 INCH DIAMETER 100 LF 115.00$11,500.00$ 604.02010011 CATCH BASIN - TYPE 1 (NYC)2 EA 10,000.00$20,000.00$ 606.10 BOX BEAM GUIDE RAILING 675 LF 40.00$27,000.00$ 606.120102 BOX BEAM GUIDE RAILING END ASSEMBLY, TYPE I 4 EA 1,100.00$4,400.00$ 606.73 REMOVING AND DISPOSING BOX BEAM GUIDE RAILING 675 LF 10.00$6,750.00$ 610.1601 TURF ESTABLISHMENT - ROADSIDE 160 SY 3.00$480.00$ 611.0111 PLANTING - MAJOR DECIDUOUS TREES - SIZE AS SPECIFIED BALL & BURLAP, FIELD POTTED OR FIELD BOXED 10 EA 500.00$5,000.00$ 619.01 BASIC WORK ZONE TRAFFIC CONTROL 1 LS 5,000.00$5,000.00$ 619.04 TYPE III CONSTRUCTION BARRICADE 2 EA 55.00$110.00$ 619.1301 TEMPORARY TRAFFIC SIGNALS 1 ELOC 10,000.00$10,000.00$ 619.1302 TEMPORARY TRAFFIC SIGNALS 1 ELOC 10,000.00$10,000.00$ 625.01 SURVEY OPERATIONS 1 LS 20,000.00$20,000.00$ 699.04001 MOBILIZATION 1 LS 8,600.00$8,600.00$ SUBTOTAL 223,090.00$ ENGINEERING 35,000.00$ CONTIGENCY (15%)33,500.00$ TOTAL 291,590.00$ REHABILITATION COST - KING ROAD WEST Item Number Item Quantity Unit Unit Cost Total Cost 201.06 CLEARING AND GRUBBING 1 LS 12,000.00$12,000.00$ 203.21 SELECT STRUCTURE FILL 530 CY 65.00$34,450.00$ 553.030001 TEMPORARY WATERWAY DIVERSION STRUCTURE 1 LS 5,000.00$5,000.00$ 555.97130016 STRUCTURAL CONCRETE 20 CY 1,500.00$30,000.00$ 580.01 REMOVAL OF STRUCTURAL CONCRETE 25 CY 500.00$12,500.00$ 595.50000018 SHEET-APPLIED WATERPROOFING MEMBRANE 50 SF 6.00$300.00$ 603.9824 SMOOTH INTERIOR CORRUGATED POLYETHYLENE CULVERT AND STORMDRAIN 24 INCH DIAMETER 100 LF 115.00$11,500.00$ 604.02010011 CATCH BASIN - TYPE 1 (NYC)2 EA 10,000.00$20,000.00$ 606.10 BOX BEAM GUIDE RAILING 675 LF 40.00$27,000.00$ 606.120102 BOX BEAM GUIDE RAILING END ASSEMBLY, TYPE I 4 EA 1,100.00$4,400.00$ 606.73 REMOVING AND DISPOSING BOX BEAM GUIDE RAILING 675 LF 10.00$6,750.00$ 610.1601 TURF ESTABLISHMENT - ROADSIDE 160 SY 3.00$480.00$ 611.0111 PLANTING - MAJOR DECIDUOUS TREES - SIZE AS SPECIFIED BALL & BURLAP, FIELD POTTED OR FIELD BOXED 10 EA 500.00$5,000.00$ 619.01 BASIC WORK ZONE TRAFFIC CONTROL 1 LS 5,000.00$5,000.00$ 619.04 TYPE III CONSTRUCTION BARRICADE 2 EA 55.00$110.00$ 619.1301 TEMPORARY TRAFFIC SIGNALS 1 ELOC 10,000.00$10,000.00$ 619.1302 TEMPORARY TRAFFIC SIGNALS 1 ELOC 10,000.00$10,000.00$ 625.01 SURVEY OPERATIONS 1 LS 20,000.00$20,000.00$ XXX.XXX GLASS REINFORCED PLASTIC LINER 1 LS 200,000.00$200,000.00$ 699.04001 MOBILIZATION 1 LS 16,600.00$16,600.00$ SUBTOTAL 431,090.00$ ENGINEERING 35,000.00$ CONTIGENCY (15%)64,700.00$ TOTAL 530,790.00$ SLIP-LINING COST - KING ROAD WEST Item Number Item Quantity Unit Unit Cost Total Cost 201.06 CLEARING AND GRUBBING NEC LS 20,000.00$20,000.00$ 203.02 UNCLASSIFIED EXCAVATION AND DISPOSAL 240 CY 50.00$12,000.00$ 203.03 EMBANKMENT IN PLACE 2815 CY 35.00$98,525.00$ 203.21 SELECT STRUCTURAL FILL 860 CY 75.00$64,500.00$ 206.01 STRUCTURE EXCAVATION 600 CY 35.00$21,000.00$ 207.26 PREFABRICATED COMPOSITE STRUCTURAL DRAIN 355 SY 20.00$7,100.00$ 209.13 SILT FENCE-TEMPORARY 200 LF 6.00$1,200.00$ 304.12 SUBBASE COURSE, TYPE 2 108 CY 75.00$8,100.00$ 404.0983 9.5 F3 TOP COURSE ASPHALT, 80 SERIES COMPACTION 32 TON 140.00$4,480.00$ 404.1989 19 F9 BINDER COURSE ASPHALT, 80 SERIES COMPACTION 50 TON $ 135.00 6,750.00$ 404.2589 25 F9 BINDER COURSE ASPHALT, 80 SERIES COMPACTION 70 TON $ 150.00 10,500.00$ 407.0102 DILUTED TACK COAT 367 GAL $ 4.00 1,468.00$ 418.7603 ASPHALT PAVEMENT JOINT ADHESIVE 160 LF $ 1.00 160.00$ 553.030001 TEMPORARY WATERWAY DIVERSION STRUCTURE 1 EACH 20,000.00$20,000.00$ 555.97130016 STRUCTURAL CONCRETE 19 CY 1,500.00$28,500.00$ 595.50000018 SHEET-APPLIED WATERPROOFING MEMBRANE 3340 SF 6.00$20,040.00$ 603.63180615 PRECAST CONCRETE BOX CULVERT (FILL HEIGHT 2 FT OR GREATER)115 LF 4,500.00$517,500.00$ 603.98240000 SMOOTH INTERIOR CORRUGATED POLYETHYLENE CULVERT AND STORMDRAIN 24 INCH DIAMETER 100 LF 115.00$11,500.00$ 604.02010010 CATCH BASIN - TYPE 1 (NYC)1 EA 10,000.00$10,000.00$ 606.10 BOX BEAM GUIDE RAILING 675 LF 50.00$33,750.00$ 606.120201 BOX BEAM GUIDE RAILING END ASSEMBLY, TYPE IIA 4 EAC H 2,100.00$8,400.00$ 606.71 REMOVING AND DISPOSING CORRUGATED BEAM GUIDE RAILING 675 LF 3.00$2,025.00$ 610.1601 TURF ESTABLISHMENT - ROADSIDE 367 SY 3.00$1,101.00$ 611.01 PLANTING - MAJOR DECIDUOUS TREES - SIZE AS SPECIFIED BALL & BURLAP, FIELD POTTED OR FIELD BOXED 20 EA 500.00$10,000.00$ 619.01 BASIC WORK ZONE TRAFFIC CONTROL NEC LS 30,000.00$30,000.00$ 619.04 TYPE III CONSTRUCTION BARRICADE 14 EA 55.00$770.00$ 620.05 STONE FILLING (HEAVY)10 CY $ 150.00 1,500.00$ 620.0801 BEDDING MATERIAL, TYPE 1 4 CY $ 100.00 400.00$ 625.01 SURVEY OPERATIONS NEC LS $ 20,000.00 20,000.00$ 627.50140008 CUTTING PAVEMENT 60 LF $ 3.00 180.00$ 646.32 STEEL POST, 2.0 LB/FT 8 EA 100.00$800.00$ 699.04001 MOBILIZATION 1 LS 38,900.00$38,900.00$ SUBTOTAL 1,011,149.00$ ENGINEERING 40,000.00$ CONTIGENCY (15%)151,700.00$ TOTAL 1,202,849.00$ REPLACEMENT COST - KING ROAD WEST