HomeMy WebLinkAbout#13 - 2023 Street Improvements Design Change STAFF REPORT
DATE: June 20, 2023
CONSENT
AGENDA ITEM: Approve Tana Ridge Curb Design Revisions for the 2023 Street Improvements SUBMITTED BY: Jack Griffin, City Engineer REVIEWED BY: Kristina Handt, City Administrator Marty Powers, Public Works Director Mike Rusenovich, Project Engineer
ISSUE BEFORE COUNCIL: Should the City Council approve a design change to revise the curb and gutter type used in the Tana Ridge subdivision for the 2023 Street Improvements? BACKGROUND: On April 18, 2023, the City Council awarded a construction contract for the 2023 Street Improvements project, including street and drainage improvements within the Tana Ridge neighborhood and the Fields of St. Croix 2nd Addition, consisting of approximately 12,300 feet (2.3 miles) of local streets. The improvements include the installation of new concrete curb and gutter to replace the existing bituminous curb. As part of the project design a combination of surmountable concrete curb and gutter and barrier concrete curb and gutter (B418) were used in the approved design. More specifically, surmountable curb was proposed along the frontage of each property, and barrier curb
was proposed as requested by Public Works along each inside radii, at catch basins, at corner radii, and along open space/Outlot property (see attached Exhibits 1 and 2 – Original Project Design). Barrier curb provides improved drainage characteristics, helps to guide snow plow operations at critical locations, and
helps to maintain vehicle traffic on the paved roadway surface while driving and when parking. PROPOSAL DETAILS/ANALYSIS: At the June 6, 2023 City Council meeting, in response to a petition
and property owner communications to staff/Council, the Council directed staff to revise the curb type layout for the Tana Ridge neighborhood, by increasing the use of surmountable curb when deemed acceptable to Public Works. Following the meeting, staff reviewed and revised the project design accordingly. The attached Exhibit 3 depicts the revised design, after replacing 1,918 feet of barrier curb with surmountable curb. In the revised design the use of barrier curb was limited to inside radii, at catch basins (not shown), and at corner radii. Staff reviewed the proposed changes with the project contractor and it was jointly determined that a formal change order would not be necessary to implement changes. Staff is therefore only seeking Council approval for this Council directed change in the design. The contractor intends to begin curb installation on June 21, 2023.
FISCAL IMPACT: Approval of this design change will alter the final installed quantities for the different curb types. The estimated price change from barrier curb to surmountable curb is 1,918 LF x $0.19 per LF;
or $364.42. RECOMMENDATION: Staff is recommending that the City Council approve, as part of the consent
agenda, a change in the curb design/layout for the Tana Ridge neighborhood as depicted in the attached Exhibit 3 – Revised Design, for the 2023 Street Improvements. If removed from the consent agenda, the recommended motion for this action is as follows:
“Move to approve the revised curb design/layout for the Tana Ridge neighborhood as depicted in the
attached Exhibit 3 – Revised Design, for the 2023 Street Improvements.”
ATTACHMENTS: 1. Exhibit 1 – Original Curb Design for Tana Ridge.
2. Exhibit 2 – Original Curb Design for Fields of St. Croix 2nd Addition. 3. Exhibit 3 – Proposed Curb Design for Tana Ridge.
2023 Street ImprovementsMARCH 7, 2023 FOCUSENGINEERING, inc.• Surmountable curb to be installed along lot frontage when feasible. • 4” high-back (barrier curb) installed at subdivision entrances and along Outlots/Park areas.TANA RIDGEFULL DEPTH RECLAMATION• 8” Full Depth reclamation to create a recycled aggregate base.• 2” Bituminous Base Course.• 1-1/2” Bituminous Wear Course.
2023 Street ImprovementsMARCH 7, 2023 FOCUSENGINEERING, inc.FIELDS OF ST CROIX 2ND ADDITIONFULL DEPTH RECLAMATION• Surmountable curb to be installed along lot frontage when feasible. • 4” high-back (barrier curb) installed at subdivision entrances and along Outlots/Park areas.• 8” Full Depth reclamation to create a recycled aggregate base.• 2” Bituminous Base Course.• 1-1/2” Bituminous Wear Course.• Entrance one-way streets widened to 19 ft. B-B (existing is 17 ft.).
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LEGEND:
SURMOUNTABLE CURB
BARRIER CURB
H:\LKELMN\0N1129205\CAD\C3D\FIGR-129205-B V SURM_1_V2.dwg 6/9/2023 12:25:59 PMR
2023 Street Improvements
City of Lake Elmo
Figure 1: Surmountable and Barrier Curbs (Tana Ridge)
June 2023