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