PROJECT NO. CIP 99-529 CLARK FIELD IMPROVEMENTS, BUILDING DEMOLITION
APPROVE SUPPLEMENTAL AGREEMENT BETWEEN
CITY AND CONTRACTOR

 

Recommendation:

It is recommended that the City Council:

1. Approve the attached Supplemental Agreement No. 1 for Project No. CIP 99-529 Clark Field Building Demolition in the amount of $33,239.00;
2. Authorize the City Manager and the Director of Public Works/City Engineer to execute the Supplemental Agreement; and
3. Re-appropriated $50,000 from FY 1999-00 budget to the FY 2000-01 budget.

 

Background:

On January 25, 2000, Council awarded a construction contract to Viking Equipment Corp. (Contractor) for the demolition of the enclosed storage area (building) located at Clark Field. The award was based on the Contractor’s low bid price of $8,300.

During the demolition work, it was discovered that what initially appeared to be a retaining wall behind the building wall was, in fact, a row of cement blocks without any structural value. The building’s wall had been acting as a retaining wall, holding back the existing slope located behind the building. The Contractor was ordered to stop work until further engineering evaluation of the wall was performed.   (click on the thumbnail below for a larger photo.)

Staff engaged the services of an engineering firm, Jonathan E. Mahn, P.E., to evaluate the building wall and to provide design and recommendations. The engineering report has been completed and provides the following findings and recommendations:

1. The removal of the building has not adversely affected the slope’s stability. The engineer did not find any stress cracks or signs of slope failure.
2. The existing building wall should remain in place to provide shoring for a proposed retaining wall and for the protection of the existing slope.
3. A retaining wall should be constructed in front of the existing wall.

Based upon the engineering design provided by the consultant, Staff has obtained a proposal from the Contractor to construct the retaining wall structure for $33,239.00. The proposed work will be completed within 45 days from the date of the notice to proceed. Accordingly, the project can be completed ahead of the rainy season.

 

Analysis:

Since this project cannot be completed without protecting the slope behind the wall, Staff recommends that the Contractor perform the necessary work under a Supplemental Agreement for the following reasons:

1. The Contractor has performed satisfactorily during the demolition phase of the project and has provided emergency evaluation services and readiness in the event of rainfall, during the decision-making process.
2. In order to obtain bids for the proposed retaining wall work, a period of 90 days will be required. Consequently, the work would get under way at start of the rainy season.
3. The ability of the existing building wall to retain the existing slope for an extended period of time is uncertain.
4. Time is of the essence. The work must be done now to prevent potential damage to private properties.

Therefore, Staff is recommending that City Council authorize Staff to execute a Supplemental Agreement with the Contractor in the amount of $33,239.00.

 

Alternatives:

1. Approve Staff’s recommendation

2. If this alternative is chosen, all critical work will be completed ahead of the rainy season.

3. Return to Staff to rebid the proposed work

If this alternative is chosen, it is unlikely that the critical work will be completed ahead of the rainy season; consequently putting public and private property at risk.

 

Fiscal Impact:

Sufficient funds were available in the 1999-00 project budget; however, there was no opportunity to spend all funds appropriated for this project. Therefore, Staff is requesting that the funds ($119,000 in account number 125-8529-4201) be re-appropriated in the FY 2000-01 budget.

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CONTRACT CHANGE ORDER

Department of Public Works

Date: 7-11-00 Order No.: 3 Project No.: 99-529

 

Project Title: Clark Field Building Demolition

The changes or interpretations described and noted herein are hereby authorized. The signed original of this order is on file at the office of the Director of Public Works/City Engineer.

Show as separate numbered paragraphs: (1) Reason for change; (2) Description of change; (3) Change in contract cost; (4) Extension of contract, if warranted; (5) New contract total including all change orders;

SUPPLEMENTAL AGREEMENT

1. To construct a retaining wall to replace existing building wall.

2. Construct retaining wall in accordance with design criteria prepared by Bryce D. Richmond, sheets 1-4, dated 6/6/00 and Jonathan Mahn, dated 6/2/00. Sawcut and remove existing concrete slab at area of new wall only. Excludes: waterproofing membrane at back side of retaining wall, survey and engineering.

3. $33,239.00

4. 45 days

5. $45,299.00

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