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HomeMy WebLinkAbout2.b. 2022 Street Improvement Project (2022-01) – Curb and Assessment Discussion EXECUTIVE SUMMARY City Council Work Session: April 5, 2022 AGENDA ITEM: 2022 Street Improvement Project (2022-AGENDA SECTION: 01) – Curb and Assessment Discussion Discussion PREPARED BY: Brian Erickson PE, City Engineer AGENDA NO. 2.b. ATTACHMENTS: None. APPROVED BY: LJM RECOMMENDED ACTIONS: Discussion BACKGROUND During the planning and design phases of the 2022 Street Improvement Project (SIP), City Project 2022- 01, staff had discussed the potential for including ribbon curb as part of the improvement. Now that bids have been opened and a final cost has been calculated, staff is seeking final direction on the inclusion of curb on the portion of street where it does not exist. Three questions remain: 1. Should ribbon curb be installed along Areas 1 and 2? 2. If the answer to 1 is yes, how should the incremental cost be split between the City’s funds and special assessments? 3. How should smaller, unplatted parcels on Biscayne Avenue be assessed? Project Scope The 2022 SIP consists of three reconstruction areas with the existing conditions as noted: th  Area 1 – Biscayne Avenue and 126 Street West – primarily rural section with gravel shoulders th  Area 2 – Chinchilla Avenue and 127 Court West – rural section with gravel shoulders  Area 3 – Danbury Way (north of McAndrews Road) – urban section with bituminous barrier curb Based on pavement conditions these areas are planned to be reclaimed (pavement is ground up in place and mixed with underlying gravel base, and then new pavement is built on top). Area 3 will also have a new concrete barrier curb to replace the high maintenance, low durability bituminous curb. However, Areas 1 and 2 are areas where a concrete ‘ribbon’ curb would provide an improvement to pavement durability. The ribbon curb provides the following advantages over a gravel shoulder:  Protects and constrains the bituminous pavement edge, thus reducing edge cracking  Provides a more durable surface for plow blade edges/tips to glide on  Eliminates vegetation ‘migration’ into the pavement  Reduces moisture migration from the gravel shoulder to beneath the bituminous section  Reduces aggregate shoulder maintenance  Long life span (50-60 years) which will last through future pavement maintenance projects Project Cost and Funding With the opening of bids, staff has calculated the total project cost and funding required for completing this project. The tables below provide the calculations along with a comparison of previous estimates. There were six bids received, the low bid was below the Engineer Estimate and the three lowest bids were less than 10% apart. C:\\Users\\jab\\AppData\\Local\\Temp\\2.b. 2022 Street Improvement Project (2022-01) – Curb and Assessment Discuss_725888\\2.b. 2022 Street Improvement Project (2022-01) – Curb and Assessment.docx TOTAL PROJECT COSTTOTAL PROJECT FUNDING Amount of Curb & Gutter Assessed 100%75%50%35%25%0% Feasibility Engineer's Cost Based on Street CIP$ 689,716.58 $ 753,924.08 $ 818,131.58 $ 856,656.08 $ 882,339.08 $ 946,546.58 Report*Estimate @ BidLow Bid Special Assessments$ 628,215.85 $ 564,008.35 $ 499,800.85 $ 461,276.35 $ 435,593.35 $ 371,385.85 Storm Utility Fund$ 143,428.69 $ 143,428.69 $ 143,428.69 $ 143,428.69 $ 143,428.69 $ 143,428.69 Biscayne & 126 - Area 1 TOTAL$ 1,461,361.13$ 1,461,361.13$ 1,461,361.13$ 1,461,361.13$ 1,461,361.13$ 1,461,361.13 Street$ 616,800.00 $ 532,402.50 $ 535,652.25 C&G$ 223,100.00 $ 244,289.06 $ 193,889.06 Subtotal$ 839,900.00$ 776,691.56$ 729,541.31 Chinchilla & 127th - Area 2 Street$ 296,300.00 $ 273,364.88 $ 269,323.69 Storm$ 37,300.00 $ 51,299.06 $ 49,989.19 C&G$ 73,300.00 $ 78,238.13 $ 62,940.94 Subtotal$ 406,900.00$ 402,902.06$ 382,253.81 Danbury Way - Area 3 Street$ 270,300.00 $ 270,816.00 $ 256,126.50 Storm$ 129,100.00 $ 89,735.63 $ 93,439.50 Subtotal$ 399,400.00$ 360,551.63$ 349,566.00 TOTAL$ 1,646,200.00$ 1,540,145.25$ 1,461,361.13 Staff also calculated the funding for the project based on assessing the curb cost at various percentages. An overview of the totals is shown in the table below. Depending upon how assessments are directed the individual amounts would range from $18,160 to $8,927 for Area 1, and $10,480 to $6,284 for Area 2. Area 3 assessment amounts don’t vary and are calculated at $6,895 for all work. RECOMMENDATION Staff will present additional details at the work session to receive Council direction regarding curbing and assessments. 2