ACWWA 2007 WCPlan

• Project Type: Water Conservation Plan
• Applicant: Arber Water, WasteWater & Reuse Engineers
• Title: Arapahoe County Water and Wastewater Authority Water Conservation Plan
• Date: 11/1/2006
• County: Arapahoe
• Water Conservation - Doc Type: Complete Plan

Water Conservation Plan

identified and quantified. Additional information regarding water system losses and unaccounted
water for ACWW A may be found in Appendix C.

1.3.4 High Population Growth

Arapahoe County is experiencing a period of rapid population growth. Between 1990 and 2004,
the population in Arapahoe County has increased by 19.9% based on estimates provided by the
State of Colorado. The County is projected to grow by an additional 0.9% in 2006. The current
population of Arapahoe County is estimated to be 530,400. The majority of the growth in
Arapahoe County is on the western side of the county. This coincides with the ACWW A service
area.

1.3.5 Plan for Substantial Improvements

Currently, water sources for ACWW A consist of alluvial and non-tributary wells. Disinfection is
provided with sodium hypochlorite, and an oxidation sequestering agent is also administered to
prevent iron precipitation at some well heads prior to the water being pumped into the
distribution systems. Due to increasing influence from upstream dischargers, as discussed in
Section 1.2.3, and the supply shortage as discussed in Section 1.3.2, ACWW A is planning an
indirect potable reuse system to serve their community and to expand the existing non-potable
water system. The Joint Water Purification Project (JWPP) will increase the Authority's water
supply and reduce their reliance on deep groundwater thus extending the life of a nonrenewable
resource. The Joint Water Purification Project Water Treatment Plant (JWPPWTP) will improve
the potable water quality and provide a positive barrier to contaminants that may be in the raw
water due to upstream dischargers and the alluvial recharge system.

Additional planned improvement projects within the Authority include water supply
improvement and delivery projects, an additional 4 million gallon water storage tanl( and
miscellaneous distribution system improvements. Water supply and delivery projects include the
Northern Water Supply Project, the Cherry Creel( Project Pipeline and Pump Station and the
development of new alluvial wells. Planned improvement projects are discussed further in
Chapter 3.

1.3.6 Increases to Wastewater Facility

ACWW A provides water and wastewater services to the Arapahoe Wastewater Service Area and
the Cottonwood Water and Sanitation District. Wastewater within this area is treated at the
L TCWRF. The plant provides tertiary treatment and has a current peal( month design capacity of
2.4 mgd. Current monthly average influent flows are approximately 1.6 mgd. Tertiary effluent
produced by the L TCWRF is used for irrigation of the Valley Country Club Golf Course.
Effluent that is not used for irrigation of the golf course is discharged to Lone Tree Creel(.

ACWW A has commenced a project to expand the existing L TCWRF to a peal( month capacity
of 3.6 mgd (3.3 mgd annual average flow). Major structures in the expanded facility will have
concrete sized for a peal( month capacity of 5.4 mgd. Equipment will be installed to expand the

November 2006

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Richard P. Arber Associates, Inc.