To: Honorable Mayor and Members of Town Council
Through: David L. Corliss, Town Manager
From: Mark Marlowe, P.E., Director of Castle Rock Water
Roy Gallea, P.E., Engineering Manager
Jeanne Stevens, P.E., CIP Project Manager
Title
Resolution Approving and Adopting the Town of Castle Rock 2023 Water Master Plan [Entire Castle Rock Water Service Area]
Body
________________________________________________________________________________
Executive Summary
This memorandum has been prepared to request Town Council approval of a Resolution adopting the 2023 Water Master Plan (see Attachment A). The 2023 Water Master Plan (2023 Plan) presents findings and recommendations resulting from a reassessment of water program needs for the Town of Castle Rock through 2065, with a focus on near term needs through 2027.
Currently the Town of Castle Rock’s potable water distribution system, which serves a population of over 82,000, has more than 14,800 system valves, more than 4,720 active fire hydrants, is over 439 miles in total length, and distributes (on average) in excess of 9.38 million gallons of potable water each day to the customers of Castle Rock. The 2022 peak day demand was 19.22 million gallons per day (MGD). At an estimated build-out population that accounts for future annexations of potential infill areas and extraterritorial services, the distribution system could serve more than 155,000 residents.
For planning purposes, the 2023 Plan estimates high-case and low-case scenarios to encompass a range of possibilities. In order to plan for varying scenarios, Castle Rock Water (CRW) has identified that projected demands could be as low as 12,546 Acre-Feet (AF) under the high water conservation scenario of 100 gallons per capita day (gpcd), and 112,000 people versus 23,439 AF under a low water conservation scenario of 135 gpcd with 155,000 people. In the 2023 Plan, the base scenario is 118 gpcd at a population of 122,000, and corresponds to a projected demand of 16,126 AF by 2050. This includes an assumption that once the estimated built-out population is reached, no more population growth is planned under that scenario.
The following represent key efforts and planned major investments CRW will be doing going forward as part of the plan:
• Investigate whether the migration to direct potable reuse (DPR) from the current indirect potable reuse (IPR) scenario is the right path forward for CRW, looking at the cost, regulatory, technical and water quality implications to make an informed decision for its customers;
• Evaluate water quality continuously, health advisories and maximum contaminant levels and continue to optimize water treatment to address these items as science and regulation develop;
• Monitor our drinking water reservoirs and develop programs to ensure raw water quality in these reservoirs is maintained;
• Complete Advanced Metering Infrastructure (AMI);
• Execute the SCADA Master Plan with a focus on continuing to improve our cybersecurity;
• Fully incorporate the service area to include the existing Bell Mountain Ranch system;
• Ramp up the Rehab and Replacement Plan with priorities being the Prestwick water line replacement in 2023 and Young American rehab and replacement in 2024 and 2025. Young American will be phased due to size and budget constraints of $2 Million/year;
• Support state and local efforts to reduce phosphorus and nitrogen in the local watersheds through its participation with the Chatfield Watershed Authority (CWA) and the Cherry Creek Basin Water Quality Authority (CCBWQA);
• Work with partnering agencies to expand our capabilities to store and/or bring reusable water supplies back to the Town;
• Advance regional projects that position CRW for the future. Projects to construct infrastructure such as reservoirs, pipelines, and treatment facilities are occurring and Castle Rock will continue to support and participate in these projects where it makes sense. This infrastructure helps bring water to the area and, through economies of scale by partnering with other entities, reduces the cost impact to our customers for long-term renewable water supply;
• Defend our groundwater rights against harmful changes to management of those rights by the State, constructing new wells, acquiring additional groundwater rights, and adding new groundwater sources to our groundwater treatment plants that have available capacity as well as constructing new plant capacity where it makes sense;
• Utilize the interconnect with the Pinery to bring CCPWA renewable water back to RWRWTC for retreatment and distribution;
• Identify and implement projects to improve long term sustainability through resource recovery and reducing net energy use;
• Construct and integrate the East Plum Creek Open Space ASR Wells with a construction cost of $2,613,215.01;
• Integrate Bell Mountain into the Castle Rock Water service with the construction of a pump station, pipeline, and tank in 2023;
• Expansion of PCWPF from 6MGD to 12MGD with an estimated cost of $58.8 Million;
• Construction of Tank 11B, a new 2.3MG tank with an estimated cost of $6,600,000;
• Replacement of the aging Tank 3 with an estimated cost of $2,200,000;
• Upgrades to the existing Hillside pump station from 800gpm to 2,600gpm;
Proposed Motion
“I move to approve the Resolution as introduced by title.”
Alternative Motions
“I move to approve the resolution as introduced by title, with the following conditions: (list conditions).”
“I move to continue this item to the Town Council meeting on _____ date to allow additional time to (list information needed).”
Attachments
Attachment A: Resolution
Exhibit 1: 2023 Water Master Plan