Main Treatment Plant - Additional Expenditure
for Construction of Digester Gas Control Building
Contract No. WPC-5-97
The Works and Utilities Committee recommends the adoption of the following report (November 27, 1998) from
the Commissioner of Works and Emergency Services:
Purpose:
To obtain Council authority to negotiate and authorize additional expenditures for the performance of necessary additional
work on Contract No. WPC-5-97 for the construction of the Digester Gas Control Building at the Main Treatment Plant.
Funding Sources:
Funds are available in the approved 1998-2002 Water and Wastewater Services Division, Water Pollution Control Capital
Account C-WP160, Main Treatment Plant.
Recommendations:
It is recommended that:
(1)additional expenditures in the amount of $1,393,444.44, including Goods and Services Tax, be authorized for the
performance of necessary additional work on Contract No. WPC-5-97 for the construction of the Digester Gas Control
Building at the Main Treatment Plant in accordance with the estimates listed in Appendix A attached; and
(2)the appropriate City officials be authorized to take the necessary action to give effect thereto.
Background:
By adoption of Clause No. 28 of Report No. 12 of The Environment and Public Space Committee, the former Metro
Council, at its meeting of September 24, 1997, awarded Contract No. WPC-5-97 for the construction of the Digester Gas
Control Building at the Main Treatment Plant. The contract was awarded to Bondfield Construction Company (1983) Ltd.
for the total lump sum tender price of $24,549,000.00 including GST and a Schedule of Prices allowance of $129,900.00
for additional work if required. The order to commence work was dated October 22, 1997, at which time the contract
work began.
At the time of award, in accordance with former Metro By-law No. 146-90, as amended, a Department Head had authority
to approve additional expenditures on a commitment in accordance with the By-law up to an amount equal to ten percent
of the commitment. As such, under the former Metro By-law a further $2,454,900.00 or ten percent of the awarded
contract amount would have been available for required extra work.
At its meeting of January 6, 1998, City of Toronto Council enacted By-law No. 7-1998, Interim Financial Control
By-law, which repealed former Metro By-law No. 146-90. As the new by-law contains no provision to exceed the
awarded contract value, as confirmed by the City's Legal Division, the Department has effectively lost its ability to
authorize the unforeseen and necessary additional work that may arise during construction of capital projects. This is
particularly problematic given that the majority of capital construction performed by this Department is tendered on a
firm, lump sum basis. For contracts recently tendered, since confirmation of the repeal of former Metro By-law No.
146-90, we have been providing, on an interim basis, a general contingency allowance for possible extra work into the
Schedule of Prices for Alterations, Extras, and Deductions for incorporation into the total lump sum tender price. In the
case of Contract No.WPC-5-97, however, no such general contingency was added, as we believed it was still available
through former Metro By-law No. 146-90.
Comments and Justification:
Since the commencement of Contract No. WPC-5-97, issues have been identified as requiring the performance of extra
work. In some cases, additional information and unexpected circumstances have arisen during construction, which have
necessitated changes to the original tendered scope of work. To ensure continuity with respect to liability and warranty
issues under the contract, these changes must be implemented by the issuance of extra work orders. For example,
unanticipated contaminated soils encountered during construction have resulted in the additional trucking and disposal
costs associated with landfill disposal. In other cases, staff of the Department and/or our consultants have identified
changes to the design of the original contract which are now advisable to be performed to conform to changed regulatory
code requirements or operating procedures, and which should be implemented to ensure construction of the best possible
finished product. For instance, proposed changes to the raw sludge distribution valving and control systems to be
constructed in existing anaerobic digestion tanks nos. 5 to 12 have resulted in expediting the construction of a previously
designed control room building for digestion tanks nos. 1 to 12. As well, it is proposed to install an integrated
natural/digester gas flow measurement system to more accurately determine Main Plant digester gas production, and
consumption of both digester gas and natural gas. Such a system will prove invaluable in improving unit process cost data
during the conversion to 100 percent beneficial reuse of biosolids, and in any future district energy or co-generation
initiatives. For the same aforementioned reasons of liabilities and warranty issues, these changes are required to be
performed under the contract by the issuance of extra work orders.
Conclusion:
The additional expenditures required for extra work in the amount of $1,393,444.44 including GST on Contract No.
WPC-5-97 are summarized in Appendix A.
Contact Name:
Mr. P.A. Bradley, P.Eng.,
Senior Project Engineer, Technical Services Division
Telephone No.: (416) 392-8251.
APPENDIX A
Main Treatment Plant
WPC-5-97 Gas Control Building
Request for Authorization of Additional Expenditures
| Item |
Description |
Terms |
Authorized
Amount |
| 1 |
Truck/dispose registerable soil at Keele Valley |
LS |
$15,916.80 |
| 2 |
CREDIT: delete flanges on exterior gas piping |
LS |
-13,356.00 |
| 3 |
Additional Seawall Tunnel wall dowels resteel |
LS |
3,218.15 |
| 4 |
Construct Dig. 1-12 control room building |
LS |
615,250.00 |
| 5 |
CREDIT: mods. to combustible gas monitoring system |
LS |
-1,280.51 |
| 6 |
CREDIT: delete security gate and guardhouse |
LS |
-36,000.00 |
| 7 |
Extend height of shoreline sheetpiling |
LS |
24,726.00 |
| 8 |
Remove obstruction at tunnel piles H19/H20 |
LS |
5,000.00 |
| 9 |
CREDIT: construction power consumption |
LS |
-10,000.00 |
| 10 |
Remove obstruction at sheet pile at outfall |
LS |
15,000.00 |
| 11 |
Larger openings in seawall for cable tray |
LS |
15,000.00 |
| 12 |
Relocate catch basin #2 |
LS |
2,500.00 |
| 13 |
Jeene joint alternative |
LS |
1,500.00 |
| 14 |
Replace spool at digester gas valve chamber |
LS |
5,500.00 |
| 15 |
Remove conc. saddle encasement re: 750 dia. st. sewer |
LS |
3,500.00 |
| 16 |
Program seawall gates flow metersSchedule |
Schedule |
10,000.00 |
| 17 |
New HSS support beam at overhead gas pipe |
LS |
16,000.00 |
| 18 |
Conc. encase drain pipe E. of line 7 |
LS |
12,500.00 |
| 19 |
Cut exist. steel sheeting at outfall |
LS |
14,000.00 |
| 20 |
CREDIT: concrete haunch brick support at control room bldg. |
LS |
-10,000.00 |
| 21 |
CREDIT: clevis hangers in lieu of rollers |
LS |
-2,000.00 |
| 22 |
Raise tunnel roof at exist. pipe bridge supports |
LS |
31,500.00 |
| 23 |
Substation grounding cable connection |
LS |
2,500.00 |
| 24 |
Add resteel at top of DT #1&3 columns |
LS |
1,750.00 |
| 25 |
CREDIT: gas dryer equipment alternative |
LS |
-10,000.00 |
| 26 |
CREDIT: alternative rolling doors |
LS |
-4,280.00 |
| 27 |
Additional excavation at Dig. #1-12 control room bldg. |
LS |
30,000.00 |
| 28 |
Building lighting modificationsest |
est |
60,000.00 |
| 29 |
Gasproofing inspectionSchedule |
Schedule |
20,000.00 |
| 30 |
Shoreline restorationSchedule |
Schedule |
25,000.00 |
| 31 |
Digester gas utilization system |
Schedule |
550,000.00 |
|
|
TOTAL |
$1,393,444.44 |
