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Item 1.D.
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| City Council Regular | |
| Date: | 01/27/2025 |
| Title: | W.O. 19-12, West End Reservoir Project, GC/CM Contract Change Order No. 4, Site Clearing & Preparation |
| Presented by: | Debi Meling |
| Department: | Public Works |
| Presentation: | No |
| Legal Review: | Template Contract |
| Project Number: | N/A |
RECOMMENDATION
Staff recommends that the City Council approve Change Order No. 4 to the Standard Agreement and General Conditions Between Owner and General Contractor/Construction Manager (Construction Contract) with Dick Anderson Construction, Inc. for the W.O. 19-12: West End Reservoir Project in the amount of $2,168,482.86.
BACKGROUND (Consistency with Adopted Plans and Policies, if applicable)
On December 11, 2023, City Council approved a Construction Contract with DAC for the West End Reservoir Project in the amount of $153,211.35. This initial contract Guaranteed Maximum Price (GMP) allowed the Project Team to begin dewatering the reservoir site through rental of temporary pumping equipment and purchase of permanent dewatering equipment.
Change Order No. 1 for the procurement of an electrical equipment substation for the Raw Water Pump Station (RWPS) for a GMP of $408,352.64 was approved by City Council on August 26, 2024. Early procurement of this equipment ahead of construction was necessary to maintain overall project schedule due to the 40-week lead time in delivering the project site.
On November 25, 2024, City Council approved Change Order No. 2 for the construction of the BBWA Raw Water Delivery (RWD) Facilities in a GMP amount of $13,553,020.76. Work includes construction of a BBWA Unloader Structure, Screen Structure, Diversion Channel, Raw Water Pump Station (RWPS), a Canyon Creek Diversion Structure, gravel access roads, and 36, 42, and 60-inch connecting piping.
Change Order No. 3 for dewatering pumping improvements for a GMP of $165,070.04 was approved by City Council on December 16, 2024 and allowed for construction of pumping systems that enabled more efficient winter operations and continuous dewatering of the north reservoir site.
Change order No. 4 now under consideration includes:
· Clearing, grubbing and stripping of approximately 35 acres along the north and east sides of the future north reservoir cell for installation of permanent dewatering drain pipe.
· Clearing 20 additional acres for future excavation and material transfer to the adjacent property.
· Removing refuse across the entire site and burning slash piles.
· Performing exploratory excavation to locate buried concrete and to confirm depth to shale.
· Removing 40,000 cubic yards of overburden soil along new dewatering trench; excavating trenches to one foot below shale for 5000 linear feet to install 12-inch perforated HDPE pipe surrounded by drainrock and geofabric, and backfilling trenches.
· Placing excavated material in lifts adjacent to the dewatering trench to 10-12 feet above grade for installation of WEWTP Zone 3 water transmission main.
Installing the drain pipe allows for continuous long-term dewatering of the majority of the site to enable future construction of the north reservoir cell. Filling 10-12 feet along 2500 feet of the eastern City property line brings a portion of the site to the future surface grade and enables construction of the remaining phase of the WEWTP Zone 3 water transmission main anticipated in 2025 under a separately bid project.
Change Order No. 1 for the procurement of an electrical equipment substation for the Raw Water Pump Station (RWPS) for a GMP of $408,352.64 was approved by City Council on August 26, 2024. Early procurement of this equipment ahead of construction was necessary to maintain overall project schedule due to the 40-week lead time in delivering the project site.
On November 25, 2024, City Council approved Change Order No. 2 for the construction of the BBWA Raw Water Delivery (RWD) Facilities in a GMP amount of $13,553,020.76. Work includes construction of a BBWA Unloader Structure, Screen Structure, Diversion Channel, Raw Water Pump Station (RWPS), a Canyon Creek Diversion Structure, gravel access roads, and 36, 42, and 60-inch connecting piping.
Change Order No. 3 for dewatering pumping improvements for a GMP of $165,070.04 was approved by City Council on December 16, 2024 and allowed for construction of pumping systems that enabled more efficient winter operations and continuous dewatering of the north reservoir site.
Change order No. 4 now under consideration includes:
· Clearing, grubbing and stripping of approximately 35 acres along the north and east sides of the future north reservoir cell for installation of permanent dewatering drain pipe.
· Clearing 20 additional acres for future excavation and material transfer to the adjacent property.
· Removing refuse across the entire site and burning slash piles.
· Performing exploratory excavation to locate buried concrete and to confirm depth to shale.
· Removing 40,000 cubic yards of overburden soil along new dewatering trench; excavating trenches to one foot below shale for 5000 linear feet to install 12-inch perforated HDPE pipe surrounded by drainrock and geofabric, and backfilling trenches.
· Placing excavated material in lifts adjacent to the dewatering trench to 10-12 feet above grade for installation of WEWTP Zone 3 water transmission main.
Installing the drain pipe allows for continuous long-term dewatering of the majority of the site to enable future construction of the north reservoir cell. Filling 10-12 feet along 2500 feet of the eastern City property line brings a portion of the site to the future surface grade and enables construction of the remaining phase of the WEWTP Zone 3 water transmission main anticipated in 2025 under a separately bid project.
ALTERNATIVES
City Council may:
- Approve Change Order No. 4 to the Standard Agreement and General Conditions Between Owner and General Contractor/Construction Manager (Construction Contract) with Dick Anderson Construction, Inc., or,
- Not approve Change Order No. 4. If Council does not approve this change order, the north cell site cannot be fully dewatered to enable construction of the reservoir, and the site will not be filled to future surface grade to enable construction of the WEWTP Zone 3 water transmission main in the most cost-effective manner.
FISCAL EFFECTS
The W.O. 19-12: West End Reservoir Project was budgeted in FY25 using Water Funds in the amount of $74,878,045. Considering previously encumbered funds of $16,794,570 and this change order in the amount of $2,168,482.86 there is $55,914,992 remaining in the budget.