The Royal Gorge Bridge and Park rebuilt its water treatment and finished water storage infrastructure. Project elements included adding redundancy to the intake pumping system, a 50-gpm conventional water treatment system housed inside a new 1,280-ft vertical structure, and a 120,000-gallon glass-fused-steel finished water storage tank. The existing site was already substantially developed; construction occurred in close proximity to existing infrastructure. Design of new elements began in August, 2017 and were completed in June, 2018.
JDS-Hydro was onsite for system start-up and continues to be a resource for operators in managing data and water usage at the Park. Closing books included a hard copy and electronic copy all construction documents, including submittals and as-built drawings.
Woodmen Hills Metropolitan District Regional Water Reclamation Facility
The existing lagoon wastewater treatment facility owned and operated by Woodmen Hills Metropolitan District (WHMD) was determined to be undersized and incapable of meeting upcoming discharge permit regulations. In 2015, WHMD entered into a Compliance Order on Consent (COC) with CDPHE which required WHMD to meet future discharge limits. JDS Hydro, having already assisted in negotiating the COC, began planning and design of a new treatment facility to meet effluent requirements in a new discharge permit issued by CDPHE. The new facility was designed for a hydraulic capacity of 1.3 MGD. The design consisted of below-grade anaerobic, anoxic, and aerobic basins for biological nutrient removal, two secondary clarifiers, pump room, and two sludge holding tanks – all consisting of approximately 6,000 cubic yards of concrete.
The facility also includes a 15,000 SF above-grade building that houses a lab, bathrooms, electrical room, blower room, dewatering room, offices, break room and solids loading area.
Process equipment for the project includes:
Pumps – RAS, WAS, Internal Recycle, Sludge Feed, Chemical Feed, and Scum Pumps
Blowers & Diffused Air System
Flow Control Valves
Dewatering Screw Press and Polymer Feed SystemSolids Loading Conveyors and Distributer
Seepage Control and Monitoring Improvements (2018)
Quail Lake Dam is a high hazard dam located in the Broadmoor area and is used to impound water in Quail Lake. Quail Lake is located within Quail Lake Park which includes various amenities including a hiking trail around the reservoir. The park is a very popular area for local residents to hike, fish, paddle, and more.
Due to an observed increase in seepage, a storage restriction had been issued for Quail Lake until the seepage could be controlled. The City of Colorado Springs Parks, Recreation, and Cultural Services department tasked JDS-Hydro with the design of a seepage collection and conveyance system on the downstream toe of the dam near the existing outlet structure. The seepage collection and conveyance system consisted of a weighted filter buttress which included a slotted collection pipe surrounded by drainage rock with a sand drainage blanket across the identified seepage area. The system tied into the existing toe drain pipe to convey collected seepage through a new concrete headwall adjacent to the existing outlet structure. In addition, there were upgrades implemented on the upstream dam embankment which included placement of new riprap and installation of a trail that connects with the existing hiking trail around the reservoir.
The new trail section provides the public with a path located closer to the water surface rather than the existing trail on the dam crest near the road. JDS-Hydro worked closely with the Dam Safety Branch throughout design and construction of this project. Construction was completed in February 2018. The Dam Safety Branch lifted the storage restriction from Quail Lake in March 2018.
Sanctuary Pointe Tank and Booster Pump Station (2017)
Continued growth along the Front Range has required many systems to increase the capacity, storage, and install new pumping systems. The Triview Metropolitan District tasked JDS-Hydro with the design of a new 1.1 MG water storage tank and booster pump station to serve expansion within the District.
The work included master planning, hydraulic analysis, permitting, design and construction management of a 1.1 MG AWWA D110 Pre-Stressed Concrete Tank and 0.75 MGD Booster Pump Station. The Booster Station design included superstructure, piping, control narrative, and pumping system for the upper pressure zone. Other work items included the design and construction management for the 12” water transmission main that provides water to the new tank.
The tank, located specifically for maximum hydraulic capability, provided a challenge during construction due to the limited site space. JDS-Hydro was able to coordinate two contractors during the construction phase. The tank and booster pump station went online April 2017.
Southmoor Water Treatment Plant (2017) – PFOA, PFOS, PFHpA removal with Single-Use Ion Exchange
The Widefield Water and Sanitation District is one of the first municipalities in the US to implement full-scale treatment of groundwater contaminated with PFAS utilizing single-use Ion Exchange media.
In May 2016, the EPA issued a Health Advisory Limit (HAL) of 70 parts-per-trillion (ppt) combined PFOA and PFOS for drinking water. Colorado Department of Public Health and Environment (CDPHE) issued a HAL of 70 ppt combined PFHpA, PFOA, and PFOS. The District relies on the Widefield Alluvial Aquifer to provide drinking water during peak summer demands. Results from EPA’s UCMR3 testing showed PFAS levels in the Widefield Aquifer exceeded both HALs.
In order to meet system demands and provide drinking water below the HAL by summer 2017, the WWSD Board of Directors gave their approval to begin a Fast-Track approach to research, pilot, and install a full-scale treatment plant. JDS Hydro, as the engineer, worked diligently with the District to evaluate GAC and IX pilot performance for a full-scale treatment system.
Design and construction of the Southmoor Water Treatment Plant preceded the media selection in order to meet the stringent deadline. The new plant went online May 4th, 2017 with two Ion Exchange resin systems capable of treating up to 3 MGD. JDS-Hydro was able to take the project to start-up (including: pilot, existing system evaluation, permitting, design, and construction) in less than a year.
Retrofit Design of Existing WWTF for Nutrient Removal – A Case Study
The City of Woodland Park is a dedicated environmental steward. The City’s existing activated sludge WWTF was designed for BOD reduction and nitrification. Retrofit design includes expansion of organic and hydraulic treatment capacities together with employing biological nutrient removal process technology. Other projects elements include construction of an additional clarifier, replacement of the existing chlorine contact basin with UV disinfection, integration of tertiary filtration, replacement of an aging belt filter press with a new, low horsepower screw press as well as relocation and expansion of sludge holding capacity. New process elements will reduce nutrient loading into Trout Creek while also allowing for reuse of plant effluent.
After performing a Plant Performance Evaluation, Site Amendment Approval was obtained by CDPHE. Primary design challenges included working within a limited footprint and manipulating basin configuration to accommodate biological nutrient removal. While PELs were obtained prior to design, significant uncertainty about future discharge permit limits also had to be considered. Built-in operational flexibility accommodates routine plant maintenance as well as targets potential future discharge permit limits. Finally, and critically, construction sequencing played into both design and value engineering. Construction is underway with substantial completion scheduled for Spring 2018.
Budget: $8.1 million
JDS-Hydro is dedicated to supporting Water and Wastewater providers. We make clients our priority by focusing on planning and design around operations and long-term objectives. We maintain a flexible and a highly efficient work environment for our employees which allows us to deliver quality engineered solutions while sustaining strong working relationships.
5540 Tech Center Drive, Suite 100
Colorado Springs, CO 80919