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w proposal to perform the work by "time and materials" where the City and Contractor would record the actual equipment, labor and materials spent on the work and use actual invoices and payroll to determine the cost of the work. After going through the records and receipts, the total cost to install the manhole is $16,217.23 which results in a 23.9% increase over the original contract amount. After the manhole was installed, Triad proceeded with the work under the original contract. After the work started in the channel, it was determined that the dewatering of the channel would prove more difficult than originally anticipated due to the excessive sediment build-up on the bottom of the channel. The original bid item for the dewatering work was $20,028. Again, Triad presented a summary of what they anticipated those additional costs to be, but we agreed to see what it would actually cost to perform the extra work. The original estimate submitted by Triad was $10,363. The actual amount agreed to in the change order is $2,625.01. After the bid, it was determined that signs to be permanently installed at the site were of a material that would difficult to maintain and it was agreed to change the sign material for a net cost reduction in the contract of $200 (original bid item was $1,500). The final item on the change order is the floating boom that floats across the Mill Race channel to prevent floatable debris from entering the City's stormwater system through the headgate. Originally, the boom was specified to be the standard color (orange) supplied by the manufacturer. Upon further discussion with Parks and Open Space, it was decided to change the color to black in order that the boom not look like an environmental hazard boom. The black material was more expensive (increase of $641.45), but would be more resistant to weather and prolong the life of the boom. Also, after the equipment began arriving on site, it was discovered that there were miscellaneous fixtures and structural attachments that were not delivered with the equipment nor shown on the original drawings that Triad was required to purchase to complete the installation. This work resulted in an additional cost of $1,137. Conclusion The original contract with Triad Mechanical was for $67,868. The change order is an increase of $19,779.24, or 29.14%, which results in a revised contract total of $87,647.24. Based on negotiations between Triad and the City and actual invoices and payrolls submitted by the Contractor, the costs on the change orders were determined reasonable and representative of the actual costs to perform the work. Due to the small size of the manhole work, it would not have been cost effective to perform the engineering tasks related to plan preparation, documentation and correspondence in order obtain additional proposals for this work. The remainder of the work would not stand on its own to be competitively bid and only resulted in a net increase of $3,562.01 or 5.2% over the original contract amount. None of this additional work results in favoritism in the award of, or diminishes competition for, future contracts. j , a~..~._ . .>~t.