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Title
Change Order No. 2 with SYB Construction in the amount of $66,590.00 for FY15 Wastewater Replacements at various locations throughout the city.
Presenter
Ron McCuller, Director of Public Works and Romin Khavari, City Engineer
Recommended Action
Approve
Analysis
On May 19, 2015, the City of Grand Prairie awarded a construction contract to SYB Construction in the amount of $548,527.70 and approved a 5% contingency of $27,426.00 for a total of $575,953.70 for the FY15 Wastewater Replacements construction project.
One location included for replacement is the wastewater main at the intersection of Marshall Drive and Belt Line Road. Construction at this location began in mid-to-late August 2015. In early September, the boring and tunneling contractor encountered a hard object on the west side of Marshall Drive and Belt Line Road. After further investigation, the contractor discovered three fiber optic duct banks instead of the two that were depicted on previous subsurface utility engineering (SUE) investigations. The contractor and City staff investigated lowering the proposed bore approximately two feet, but it was later discovered that the deepest duct bank would be in conflict with this location as well. Therefore, City staff re-designed the bored crossing under Belt Line Road at approximately six feet deeper than the original plans depicted. This change is required to maintain flow in this gravity wastewater line due to the extra depth at the bore crossing. Due to construction contract limitations, the construction activities included in this Change Order/Amendment No. 2 are the first of two phases. Phase two of the wastewater project at this location will be completed at a future date. Change Order/Amendment No. 2 in the amount of $66,590 provides for the following:
- Six-foot deeper bore and receiving pits
- Changes in manhole sizes and depths
- Installing and plugging the new 8” wastewater main to approximately 50 feet east of the intersection
- Leaving the existing wastewater lines in service until the second phase of wastewater replacement at this location can be completed at a future date.
Change Order/Amendment No. 1 in the net amount of $16,879.00 for addition and deletion of items based upon different conditions encountered during the course of construction at the Austrian Way, Graham Street, Dallas Street, NW 23rd Street, and Marshall Drive.
City staff recommends this change order option as the most viable and efficient method to replace the wastewater main at this location in light of the changes in field conditions that arose after construction began. The revised overall project completion date for all locations included in this construction contract is March 31, 2016.
Financial Consideration
Funding in the amount of $66,590.00 is available as follows:
1. $10,547 is available in project contingency. Wastewater Capital Project Fund (500692) WO #01510303 (FY15 Wastewater Main Replacements) 68540 (Construction) Contract C15114
2. $56,043 is available in the Wastewater Capital Projects Fund (500692), WO #01510303 (FY15 Wastewater Main Replacements) 68540 (Construction)
Change Order 1 currently being processed uses $16,879 of the original available $27,426 contingency.