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

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Effluent recharge is a critical factor in Prescott's water management program. An estimated 37% of the City's water consumption is presently returned to the aquifer via the recharge ponds located on the NE side of the airport. This reuse and recovery rate is expected to increase to about 60% for new alternate water systems. A 24" effluent line runs from the Sundog WWTP to the recharge facility, delivering treated effluent from 2 of the City's 3 sewer treatment plants. LAND OWNERSHIP Deep Well Ranch lies mainly west of the old Atchison Topeka and Santa Fe railroad bed (now the Peavine Trail) and includes 15 sq. miles within ASAP. Jointly owned Granite Dells Ranch and Point of Rocks Ranch lie mainly east of the old RR line and comprise almost 14 sq. miles of the study area. Rifle Ranch and adjacent Diamond E Ranch include about 400 acres lying between Willow Creek Road and SR 89, south of the new airport connector alignment. Approximately 13 sq. miles within ASAP are State Trust lands. City of Prescott owns over 2,000 acres including the airport and some industrial land surrounding it - also Antelope Hills Golf Course, Willow Lake and Heritage Park. The City also co-leases with the County the 930-acre, BLM-owned Pioneer Park. Figure 3 maps the major land holdings. TERRAIN and WATER FEATURES Flat-to-gently rolling terrain greatly characterizes the area, with 3 isolated low ridgelines trending south to north. A few major promontories are scattered at the southern end of the plan area. These include the Granite Dells landform in the south-central part of ASAP, Glassford Hill in the SE corner, and State Land T14N R2W Section 8 Indian Hill in the SW corner of ASAP. Portions of these same landforms are targeted for open space - acquisition once funding can be obtained. - .- Elevation contours range from 4,860' in the Granite • Creek channel to 5,600' on Glassford Hill. The flat areas average 5,000' above mean sea level. , Landforms are visible on the steep slopes map (Fiaure 4). Granite Creek runs northerly through ASAP and east of the airport. The creek's braided floodway is over 1,000 feet wide in places and is noted as Point of Rocks Ranch and Granite Dells Ranch Zone A on FEMA Firm maps. The floodway and looking S. across Granite Creek and the effluent floodplain will need more detailed mapping in the recharge pond-both located E. of the Prescott future prior to development. The Chino Valley Municipal Airport. Irrigation District (CVID) ditch parallels and runs west of Granite Creek. The irrigation ditch veers northwesterly and crosses under the airport's main runway as it winds toward Chino Valley's retired croplands. The ditch is now used to transport surplus lake water to the City's recharge ponds. Bottleneck Wash drains from SW to NE across Deep Well Ranch toward the airport where it meets with Granite Creek. An unnamed wash runs northward from existing SR 89A toward Coyote Springs north of Prescott Valley; the headwaters of the Agua Fria River originate from the north side of Glassford Hill. These stream channels will influence developability and any future road alignments. The city-owned reservoir Willow Lake, the few water features at the Antelope Hills Golf Course, and several stock ponds are the only known bodies of standing water in the plan area. 11