Parker Pump Station Replacement Project

The City contractor has poured the floor slab of the new storm water wet well and partially backfilled the large excavation to the top of the floor slab. Preparations are now taking place to install the wall forms of the structure with an anticipated concrete pour date in January.

The contractor has completed the waterproofing on the exterior of the walls for the flowmeter vault and has formed the deck of the structure. Work continues to progress on installing new sections of 24-inch and 54-inch pipelines at the rear of the site. Work continued in the large excavation with placement of 3 feet of crushed rock and geotextile fabric; a waste slab was poured, and the bottom of the waterproofing material has been installed. In the coming weeks, the contractor will be placing the reinforcement for the floor slab.

The City contractor is continuing work on the flowmeter vault, which is in the rear of the site with the concrete pour, for the walls that were finished last week. Crews are working to strip the formwork to allow for the installation of the waterproofing material prior to backfilling. The progress for the large excavation has slowed with additional shoring work; an additional 3-4 foot of excavation is needed for the contractor to move on to placing the materials for the foundation for the storm drain wet well structure.

The construction on the new Parker Pump Station, located at Eighth Street and Coronado Avenue is progressing. This critical infrastructure is responsible for collecting stormwater and sanitary sewer flows.

The City contractor continues to work on the excavation, where the storm drain wet well will be constructed. The third and final set of supports for the shoring is currently being installed. This will allow the crews the ability to excavate to the final elevation.

Completed Activities

• Shoring subcontractor mobilized and began sheet-pile installation
• Significant progress seen on the East shoring wall after adjusting installation methods
• Contractor utilizing a monitoring prism to record movement
• Last set of sheets driven to the design depth on the South shoring wall
• Excavation has reached a depth of 24 feet (bgs)below ground surface on both the South and North shoring walls to commence waler installation
• Completed the first row of waler installation

Upcoming Activities

• Second set of waler installation began on June 13 and will continue throughout the following week
• Excavation to a depth of 36 feet bgs and the third set of waler installation will follow
• Stockpile management and soil export will continue over the next few weeks
• Bypass piping installation is scheduled to begin in the later part next week

The City’s contractor, Filanc, worked in conjunction with their subcontractor, Foundation Pile, as well as city personnel and the CM team to streamline the sheet pile installation process. Crews focused on laying out the perimeter for the new pump station and modifying construction methods to minimize the impact of the construction on the surrounding neighborhood. Foundation crews pre-drilled the perimeter of the remaining sheet pile install locations.

This pre-active measure streamlined the driving of the sheet pile installation process, allowing greater ease of the sheet piles being driven resulting in a faster install process and minimizing noise to the neighborhood. Once predrilling activities were completed, sheet pile installation activities resumed on May 18 and the installation was completed on May 26. The project team appreciates the neighborhood’s patience and cooperation during this phase of work.

Now that shoring installation is complete, Filanc will focus on excavating to the bottom of the subgrade which is expected to take approximately one month. Filanc will also be working towards installation of a bypass system that will allow for the existing storm water discharge pipes from the pump station to be taken temporarily off-line and allow for the construction of a new meter vault while still maintaining the ability to pump storm water flows.

Shoring operations were placed on hold beginning April 28 (2023) due to concerns with the installation method. The City contractor, Filanc made adjustments to the procedure and this phase of work resumed on May 18 and is expected to be completed by May 26. Noise mitigation measures are in place; however, it will still be loud during this work.

The City and Filanc understand this activity is impactful to the surrounding neighborhood and are working to complete this work as efficiently as possible. We want to thank the residents for their cooperation and patience and apologize for the inconveniences.

The City contractor, Filanc, is currently making preparations to install the new underground pump station structures. The final step of preparations will be to install shoring for the excavation operation. During the shoring installation, the surrounding area will be impacted by the noise generated from the operation.

Mitigation measures are in place which consist of sound reduction materials installed on the fence along the north and south property lines, however, noise levels will be elevated throughout the surrounding neighborhood during this phase.

The work will consist of sheet pile installation using a vibratory hammer. Large heavy equipment has been mobilized for this work.

Neighborhood Impacts

• From April 18 to April 28, there will be a high level of noise and vibration, as a result of steel sheet pile driving and installation. A noise control plan is in place; however, please note - it will still be loud during those seven days.

Hours of Operation for Shoring Installation
Noise impacts will be limited to Monday-Friday between 7:00 am to 4:00 pm.

Construction has continued past the rain events these past few weeks and has been focused on the Storm Drain and Meter Access Vault. This month, the contractor will concurrently begin the sheet-pile installation for the deeper underground structures.

• Turned on dewatering pumps and began draw down around the Storm Drain and Meter Access Vault
• Shoring box was prepped and installed around the storm drain force mains
• Added additional precautions around the site to make everyone on site aware of the overhead utility safety hazard
• BMP’s are an ongoing focus to minimize track out
• Updated traffic control to increase visibility

Upcoming activities

• Sheet-pile installation will begin this week, aiming for Thursday, April 13.
• Continuing to excavate to subgrade at the Storm Drain Access and Meter vault structure.
• Major excavation and soil export will begin for the deep underground structures.

Figure 1. Turned on dewatering system and began discharging to draw down the water table around the FM vault
Figure 2. Shoring box install for Storm Drain Access and Meter Vault (Flowmeter Vault)

Figure 3. Flowmeter vault shoring and excavation
Figure 4. Added safety precautions for the overhead utility hazardFigure 5. Wheel washing to minimize track out

Figure 6. Traffic control on Coronado Avenue by Acacia Way

The Construction contractor is prepping for larger scopes of work after the latest rain events. Below are the latest construction updates:

• Effluent piping continues to be constructed from the desilting tank to the existing catch basin
• Began drilling dewatering wells
• Continue constructing the dewatering well discharge piping
• The intersection at Eighth and Coronado Avenue has been closed and construction fencing is being installed.
• Demolition of existing masonry wall and footing

Upcoming activities

• Electrical work to power each dewatering pump
• Dewatering for deep underground structures
• Shoring contractor will mobilize heavy equipment to begin sheet-pile installation.