June 1, 1999

To:Works Committee

From:Commissioner of Works and Emergency Services

Subject:Rehabilitation of the Glen Road Bridge

Contract No. 59690 (Ward 23- Midtown)

Purpose:

To advise the Works Committee of an increase in cost of Contract No. 59690 Rehabilitation of the Glen Road Bridge, and to request authorization for the additional funds.

Funding Sources, Financial Implications and Impact Statement:

Funds to cover the total cost of the work have been accommodated within the approved 1998 Capital Budget, and carried forward as a liability into 1999 Capital Budget Account Nos. 293-801, 217-719 and TR808

Recommendation:

It is recommended that approval be given for the expenditure of additional funds in the amount of $426,142.96, under Contract No. 59690.

Background:

Contract No. 59690 for the Rehabilitation of the Glen Road Bridge was awarded by City Council at its meeting of May 13, 1998, to Bridgecon Construction Limited, in the amount of $2,783,136.03.

The purpose of the contract was to repair the substantial structural deterioration that had occurred over the 70 years since the bridge was constructed in 1928. In preparing the contract certain assumptions had to be made about the state of the bridge because there were no structural plans for it. Once construction began last year, the actual condition of the bridge was found to be worse than assumed and as a result the rehabilitation work was more costly than anticipated.

Since the Interim Financial Control By-law, as approved by City Council, requires that expenditures beyond the awarded value of a contract be reported to City Council, this report is to authorize the additional expenditure.

Discussion:

The evaluation of the Glen Road Bridge and the preparation of contract documents was undertaken on behalf of the City by the consulting engineering firm of R. E. Winter & Associates. Due to the lack of design drawings detailing the original structure, the evaluation of the rehabilitation needs had to be based largely on visual inspections and on the examination of isolated concrete core samples.

While this investigation provided reasonably accurate information about the condition of the bridge deck, it was necessary to make a number of assumptions about the repairs required for the substructure and piers supporting the bridge. On the basis of the visual inspections and concrete cores, a provisional sum of $200,000 was included in the contract award to account for unanticipated work related to the piers and substructure.

Once the rehabilitation work commenced and the deck had been removed, it became evident that the assumptions made in the evaluation of the bridge had substantially underestimated the deterioration of the deck substructure and the piers supporting the bridge. Additional internal deterioration of the piers made it necessary to undertake repairs costing approximately $450,000. These repairs, together with additional deck repairs and minor item variances, accounted for additional costs in the amount of $626,142.96, exceeding the contract award value by $426,142.96. In order to successfully reinstate the bridge it was necessary to undertake the remedial work while the deck was exposed.

The final cost of the work is $3,209,278.99. The total cost of the work has been accommodated in the Capital Budget Account Nos. 293-801, 217-719 and TR 808.

Conclusions:

The final cost of Contract No. 59690 in the amount of $3,209,278.99 is in excess of the award amount by $426,142.96. The additional costs were due to the discovery of greater structural deterioration of the bridge than the original inspection had anticipated. In accordance with the Interim Financial Control By-law, this matter is being referred to your Committee for authorization of the additional expenditure.

Contact Name:

Tim Dennis

Manager Design and Construction, District 1

Technical Services

Tel: (416) 392-6787

Fax:(416) 392-7874

Tom Denes, P. Eng.,

Executive Director,

Technical Services Division

Barry H. Gutteridge

Commissioner, Works and Emergency Services

Barry H. Gutteridge

Commissioner

Works and Emergency Services