Memorandum

City of Lawrence

Public Works Department

TO:	Dave Corliss, Interim City Manager
FROM:	Steve Bennett, Buildings & Structures Manager
CC:	Charles Soules, Public Works Director Debbie Van Saun, Assistant City Manager
Date:	May 8, 2006
RE:	Parking Structures Repairs Project

Please place the following item on the consent agenda for City Commission consideration at their May 16, 2006 meeting:

Set bid date for a parking structures repair project.

Project History.  Walker Parking Consultants were hired to review the City of Lawrence Riverfront and New Hampshire Parking Structures, noting the observed conditions of the structural members, floor surfaces, ceiling surfaces, joints, walls, facades, waterproofing materials, and other features. Visual observations were also conducted of the exposed mechanical and electrical systems. The review included select materials testing, and a review of structural drawings and previous reports. The objectives with these services were to:

· Evaluate the overall condition of the structures.

· Present findings and recommendations for work items that require repair.

· Evaluate the impact of the noted deterioration on long-term durability and service life of facility.

· Identify and prioritize repair and maintenance items required for maintaining the structure through their respective remaining service life.

· Present a recommended repair program and associated probable costs.

Project Funding.  This project is being funded with Parking reserve fund (New Hampshire garage) and Capital Improvement Reserve Fund (Riverfront garage).

Project Status.  Included below is a summary of the findings of the Walker Parking Consultants review of both the Riverfront and New Hampshire Parking Structures:

RIVERFRONT PARKING GARAGE

Constructed 1989-1990

510 Parking Spaces

The Riverfront Parking Structure includes a slab on grade parking level and one structural pre-cast supported concrete level. The parking garage is in good shape for its age. The conditions observed include deterioration that is considered typical in garages with over 15 years of service life. The major conditions observed include deteriorated stairs, failed expansion joints, concrete spalls, moisture infiltration to the lower level at stairs entrance, and miscellaneous maintenance repairs.

Recommended repairs would be replacement of stairs, concrete repairs to the floor slabs, removal of the brick plaza at the stair entrances, and waterproofing and maintenance repairs.

The stairs will be bid as a separate project, however stair replacement costs are included in the overall estimates.

Summary of Estimated Costs – Riverfront Parking Structure:

Concrete Repairs                                                     64,000

Waterproofing / Protection                                     107,000

Mechanical Systems                                                  4,000

Stair replacement                                                    75,000

Miscellaneous                                                           3,000

Mobilization                                                            17,710

Subtotal                                                               270,710

Contingency                                                           25,300

Total                                                                 296,010

The Riverfront Parking Structure will require regularly scheduled repair to the concrete members, re-application of the silane sealer, and the replacement of sealants and on going tracking of the chloride ion content of supported floor slab. Expansion joints will need continued maintenance to minimize water migration to the level.

New Hampshire Parking Garage

Constructed 2000-2001

493 Parking Spaces

The New Hampshire Parking Structure includes a slab on grade parking level and three supported structural levels constructed of precast concrete tees. The condition observed include minor deterioration that is considered typical in garages with five years of service life. The structure is showing slight deterioration that we consider typical in garages with five years of service life. The structure is showing slight deterioration and only requires protective applications and maintenance to mitigate infiltration of concrete components with chlorides that induces corrosion. The double tee floor system is in good condition. The major conditions observed include sealant failures; weld connection failures, minor concrete spalls, and corrosion of metal stairs/railings.  Recommended repairs would include minor concrete repairs; reestablish weld connections, waterproofing, and maintenance repairs.

Summary of Estimated Costs – New Hampshire Parking Structure:

Concrete Repairs                                                     13,500

Waterproofing/Protection                                         95,500

Mechanical Systems                                                  7,000

Architectural-Paint Stairs                                          10,000

Miscellaneous                                                           5,000

Mobilization                                                             9,170

Subtotal                                                             140,170

Contingency                                                           13,100

Total                                                                  153,270

The New Hampshire Parking Structure will require regularly scheduled repairs to the concrete member, replacement of sealants, reapplication of the silane sealer, reapplication of the traffic topping membrane and ongoing tracking of the chloride ion content of floor slabs. Maintenance sandblasting and painting of metal stairs and railings will be an ongoing maintenance item.  

City Commission Action.  Approval is requested from the City Commission to set a bid opening date of June 27, 2006.