CC - Agendas - City Council - REGULAR - 11/28/2017

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Water Service — The ASAP area lies between Prescott and its primary water supply, the well fields in Chino Valley. A new 36" water transmission line is under construction, and will supplement the existing 18" water transmission main crossing Deep Well Ranch west of SR 89. Phases I and II are done, with Phase III being installed concurrent with the widening of Willow Creek Road. The expanded transmission line will increase city water production by more than 50% to meet peak demands of summer use. Three water tanks lie within ASAP - a new 2 million gallon (MG) tank recently installed on Section 8 Indian Hill, a 1.5-MG tank located at the end of Melville Road, and a 0.1-MG tank in the Longview subdivision. No new water tanks are planned at this time. Developed properties within ASAP utilize central water (either City of Prescott or the Granite Dells Water Company) except the Side Road neighborhood, which utilizes individual wells. Eight-inch water lines generally serve the airport area industries, with a 10" water main NW of the main runway and a 12" water main within Melville Road ROW serving Exsil and the growing industrial park. These larger water mains and the increased water delivery from the Chino Valley transmission line will afford adequate water for future industrial and commercial development in the airport area. A new 12" alternate water loop is programmed in 2001 to feed into the airport water zone, which will increase service flows and supply to the greater airport area —especially along its east side where new industry is locating. In 1998 the Prescott Active Management Area (AMA) was declared to no longer be in a state of "safe yield", meaning that groundwater is now being removed faster than it is replenished. This also means that any new residential subdivisions not already platted by August 21,1998 will need to acquire alternate water — either from surface water rights, use of effluent recharge credits, retirement of grandfathered irrigation rights, or from imported water from outside of the AMA. Present Council policy is to allocate up to 120 acre feet (AF) of alternate water per year for new residential development. City of Prescott is currently the only area water provider designated by AZ Dept. of Water Resources (ADWR) to have a 100-yr. assured water supply. Prescott also has a legislative right to import 14,000 AF of groundwater from the Big Chino basin located outside of the AMA, although these water rights are under scrutiny by users of the Verde River for hydrological reasons. Recently the Town of Chino Valley became a water supply company by purchasing water from City of Prescott thereby allowing the town to now serve selected commercial users. Residential uses in Chino Valley continue to rely on individual wells and septic. In 1999 the Town of Prescott Valley purchased the Shamrock Water Company, allowing the town more control over its water use policies. Like Prescott, any new residential development in Prescott Valley not already platted on assured water will need an alternate water source. Presently, however, the Town of Prescott Valley does not control any water rights outside of the AMA. The development of alternate water supplies and infrastructure will ultimately determine where and how future residential neighborhoods will occur within ASAP. Sewer Service — Developed areas within ASAP are generally on central sewer served by the City of Prescott's airport wastewater treatment plant (WWTP). Exceptions are the metes and bounds Side Road area, Longview Estates, the Jack Drive and Perkins Drive areas, and scattered development east and west of SR 89 north of Willow Lake Road (Figure 2). The airport WWTP recently expanded its treatment capacity from 0.75 million gallons per day (MGD) to 2.25 MGD. The treatment plant is currently treating about 0.7 MGD. Following build-out of Prescott Lakes and Pinon Oaks developments, however, a remaining treatment surplus is expected of about 0.8 MGD. 10