CONTINUING WORK

3Kings Water Treatment Plant Construction 

3KWTP construction continues and is on schedule. Work activities include:

Construction Mitigation 

Construction mitigation (fencing, erosion protection, mud track off pads, etc.) are in place and will remain for the duration of the project.

The temporary pedestrian walkway adjacent to the project site and along the west side of Three Kings Drive has been removed and new sidewalk and gutter installed.

Efforts to prevent the tracking of debris off the site continue. As the season changes, road sweeping will be adjusted to address the changing conditions from mud to dust. 

Site Construction

Building shells and roof structures for all eight buildings are now completed. Final roofing materials, windows, exterior siding, and stone veneer is being installed and is generally complete on six of the eight buildings.

Work inside the buildings will continue late winter through early spring. Start-up and testing of all building and treatment systems will occur from early spring to early summer.

Site yard piping is complete and site grading is underway. Site landscaping, fencing, paving, cleanup, and removal of construction trailers will occur as soon as the weather allows.

Construction is scheduled to be complete, water treatment operations to commence, and water administration to move onto the site in June 2023.

Three Kings Drive Roadway Work

Landscape restoration in the areas north of the 3KWTP site has been completed. New gutter in front of the 3KWTP will be installed in the spring of 2023. Pavement resurfacing of Three Kings Drive will be performed in 2023 by the Park City Streets Department as part of their annual paving program.

Golf Course Impacts

Restoration of all Golf areas, including Hole 11, is scheduled to be complete in mid-May 2023 and open for play as weather allows.

The following key construction mitigation items are contained in Park City’s Conditional Use Permit and Building Permits. Park City Water is committed to meeting these items.

• Working hours 7:00 a.m. to 7:00 p.m.
• No staging, unloading, or deliveries within Three Kings Drive or adjacent streets
• No parking on Three Kings Drive or adjacent streets
• Installation of a pedestrian walkway on the west side of the Three Kings Drive along the Project frontage
• Construction worker parking off-site and shuttled in and out daily
• Noise Mitigation
• Lighting Mitigation
• Park City will monitor pavement condition of Thaynes Canyon Drive and Three Kings Drive and Three Kings Drive. Pavement maintenance to be performed on an as needed basis. Final paving will be performed following project completion.
• Additionally, Public Information notices will be sent out in advance of significant work impacting the adjacent City streets occurring    (i.e. large concrete pours involving a significant number of concrete trucks on the road, large equipment deliveries, or necessary water shutdowns)

The construction manager has developed a detailed critical path for the Project. The following milestones have been identified, however, the schedule is dynamic due to work production and issues such as weather and materials availability/deliveries.

What is Mining-Influenced-Water?  

During the mining period in Park City’s history, drainage tunnels were constructed at the lower elevations of the mine works to keep water within the mountain from interfering with the mining operations.  These drainage tunnels, which contain trace metals from the natural soils and mining operations, discharged directly to the environment.  Over the course of Park City’s history, these waters have been used for various purposes such as drinking water, irrigation, and snowmaking.  The water which exits existing mine tunnel entrances (portals) are referred to as Mining-Influenced-Water (MIW).

Why Treat Mining Influenced Water?

Metals in waste streams don't naturally degrade and are toxic to aquatic life, even at low concentrations.  As part of the EPA’s Clean Water Act, it has established that cleanup of mining-influenced-waters, such as those being discharged from the tunnels, is a significant environmental benefit.  In 2014 the Utah Division of Water Quality (DWQ) and Park City entered into a Stipulated Compliance Order (SCO) which contained major milestones for treatment compliance and requirements on pollutant loadings related to the water discharges from the Judge and Spiro mine tunnels.  Non-compliance with the terms of the SCO can lead to:

• fines and operations interference from the State of Utah Division of Water Quality and the EPA:

• continued stream degradation

Characteristics of MIW Treatment Design

Water treatment design is a process in which the raw water is analyzed and, based on the receiving water characteristics (stream designation by the DWQ) and the discharge requirements for the treated effluent (water to be discharged from the plant), the treatment process is established. The design is highly site specific and focuses on treatment efficiency, reliability, cost-effectiveness, and minimalizing such items as energy use, traffic impacts, maintenance, and personnel.

Characteristics of the tunnel water must be taken into consideration in terms of physical, chemical and biological characteristic. Sizing of the M-I-W treatment plant depends upon the flows collected within each drainage tunnel. Tunnel flows change from year to year and vary significantly from season to season.  The new water treatment plant process has been developed through substantial studies, which included a year-long pilot-scale study to establish the treatment process and prove its effectiveness in removing metals in the tunnel raw water and a thorough evaluation of life-cycle cost and benefit.

The selected process is considered a multi-barrier approach and includes pre-oxidation, rapid mix/flocculation/ sedimentation (to remove specific particulate metals though precipitation), granular media filtration (to further remove iron and manganese from the water which may cause aesthetic water quality problems such as reddish and/or blackish staining of sinks/bathtubs or laundry), post-filter adsorption (where specific medias are used to remove targeted dissolved metals), and disinfection (for drinking water use).