October 2009 - South Tahoe Public Utility District

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9.3.1 Project Description A collection system of inlets and pipes with ability to gather from any one or more individual cells would be established to connect to a single pipeline leading to the pump station facility. This pipeline would serve as a suction header for the pump facility. The pump facility is planned to consist of a staging area for connection of the District‟s trailer mounted pipes. The pumps operating in parallel would connect to a discharge header to convey flow to the Harvey Place Reservoir /Irrigation Fields Connector Pipe. The existing pumps would deliver a total of 6,400 gallons per minute (9.2 MGD) at 165 feet of head which exceeds the head required to pump from the irrigation fields to the Harvey Place Reservoir via the existing Harvey Place Reservoir Outlet Facility. Facility planning would identify the optimum configuration and size of trailer mounted pumps to be utilized and rental agreements would be established to assure pump availability. The conceptual cost of the pump back station project is $0.6 million. This does not include the cost of the two existing trailer mounted pumps the District currently owns. It is possible to bypass both the emergency temporary storage facility and Harvey Place Reservoir with the C-Line inflow without pumping. Pressurized flow in the Harvey Place Reservoir Bypass Pipeline would flow to the Harvey Place Reservoir /Irrigation Fields Connector pipeline to the Harvey Place Reservoir Outlet Facility and then into the Diamond Ditch. 9.3.2 Project Considerations Using the existing trailer mounted pumps requires a considerable amount of time to empty the irrigation fields. This is not an issue if emergency stored recycled water in the irrigation fields is discharged to the Diamond Ditch. If the emergency stored recycled water in the irrigation fields is discharged to Harvey Place Reservoir, it may be desirable to have a higher capacity pump station to reduce the total amount of time required to empty the irrigation fields. Another consideration regarding the duration of time the recycled water is emergency stored in the irrigation fields lies in groundwater quality concerns. If the emergency stored recycled water is in the irrigation fields for an extended duration the irrigation fields would begin acting as a rapid infiltration basin discharging to groundwater. This may be a regulatory and environmental concern. 9.4 Project No. 4 - Diamond Valley Freshwater / Recycled Water Irrigation System This project addresses the purpose and need statement: PN-1. Inadequate land may be available to apply future recycled water flows. The Diamond Valley requires irrigation to support pasture hay and wet meadow habitats. The source water for irrigation may come from multiple sources. The irrigation fields may be irrigated with recycled water, while the remainder of the lands with water rights would receive fresh water. An irrigation water distribution system should meet the demands of both the irrigation fields and to other lands in the Diamond Valley. South Tahoe Public Utility District Recycled Water Facilities Master Plan - October 2009 Page 9-66
9.4.1 Project Description The design objective of this pipe network is to have one pipeline to convey recycled water or freshwater from the Harvey Place Reservoir outlet facility to the irrigation fields for irrigation of the irrigation fields and potentially other portions of the Diamond Valley Ranch. The Harvey Place Reservoir /Irrigation Field Connection Pipe Bypass Pipeline would convey recycled water from Harvey Place Reservoir to irrigate the irrigation fields and would provide recycled water to irrigate other lands in Diamond Valley. From this trunk system distribution pipelines branch and take irrigation water to the north and south corners of the irrigated lands in Diamond Valley. The trunk system provides flow and pressure to multiple smaller irrigation zones. The irrigation distribution system should be designed to maximize the use of gravity conveyance. Figure 9.2 (located at the end of Section 9) shows the preliminary configuration of the irrigation distribution network. This irrigation network provides water for both sprinkler and flood irrigation methods. This project also includes irrigation of the area known as the “jungle” which is located southeast of the junction of Highways 88 and 89. The irrigation system planned includes spray irrigation of the jungle within District property by utilizing a header pipe running along the jungle ridge line which is connected to the Diamond Valley Ranch irrigation supply pipeline. The irrigation area is approximately 140 acres. It is not intended to grow crops in the jungle and implementation of this aspect of Diamond Valley Ranch irrigation would only be utilized if additional application lands are needed. If jungle irrigation is implemented the conceptual cost for the project is $2.9 million. 9.4.2 Project Considerations Future phasing is a major consideration for the implementation/installation of the Diamond Valley irrigation distribution system. Initially the system is planned to distribute freshwater over the irrigation fields area, however some recycled water may be supplied for irrigation based on other factors once an application permit is secured from the Lahontan Regional Water Quality Control Board. The volume of recycled water used in Diamond Valley depends upon the amount of recycled water required for contractor irrigators. The amount of freshwater used in irrigating Diamond Valley can make up any shortfall in available recycled water needed. Because the southeast edge of the Diamond Valley Ranch abuts to Indian Creek, an effective tailwater control system would have to be implemented. Special operational considerations may need to be addressed when using pipelines for both freshwater and recycled water delivery; for example, the ability to completely drain the line when switching between the two uses. Although the majority of the land initially receives freshwater irrigation, the District should pursue Lahontan Regional Water Quality Control Board recycled water application permits for lands in the Diamond Valley. (See Project No. 12, page 10-77). 9.4.3 Phase 1 – Irrigation Fields Irrigation The first phase of the Diamond Valley Irrigation distribution system construction may be to convey water to the irrigation fields for irrigation from the Harvey Place Reservoir outlet facility via the Diamond Valley Pipeline and the Harvey Place Reservoir /Irrigation Fields Connector pipeline. The initial purpose of this line is to provide freshwater irrigation to the irrigation fields. Costs associated with the construction of this section of pipe are contained in Section 9.2 - Harvey Place Reservoir Bypass System Pipelines. Irrigation of the fields, utilized for times when temporary storage is not needed, assumes that pipe pressure is adequate to distribute irrigation flows to the entire area. It is estimated the cost South Tahoe Public Utility District Recycled Water Facilities Master Plan - October 2009 Page 9-67
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South Tahoe Public Utility District
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Table of Contents List of Tables ..
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6.4.3 Endangered Species Act ......
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Section 13: 12.4 Potential Temporar
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11.2 - Indian Creek Freshwater Trea
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Executive Summary Introduction, Pur
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Through a process of public partici
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Table ES-2 presents vital numbers r
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Section 7 - Master Plan Development
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Section 1: Introduction The purpose
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agreement between South Lake Tahoe
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irrigation ditches were used to irr
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Agreement Name 1967 Agreement Harve
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Agreement Name Celio Agreement Tent
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Section 2: Study Area 2.1 Descripti
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ecycled water facilities and public
Page 33 and 34: Section 3: Existing Freshwater Syst
Page 35 and 36: Figure 3.2: Indian Creek Reservoir
Page 37 and 38: Section 4: Existing Recycled Water
Page 39 and 40: Farm lateral must be intact to util
Page 41 and 42: 4.2.1.3 Neddenriep Ranch Partnershi
Page 43 and 44: Development in areas currently rece
Page 45 and 46: Flow (MGD) Section 5: Flow Projecti
Page 47 and 48: Table 5.0: Recycled Water Flow and
Page 49 and 50: Volume of Recycled Water (AFY) Tabl
Page 51 and 52: estimated 2028 population of 33,900
Page 53 and 54: Figure 5.2.1(b): NO 3-N versus Time
Page 55 and 56: Figure 5.2.1(f): Total Dissolved So
Page 57 and 58: 5.2.4 Groundwater Monitoring The Di
Page 59 and 60: Section 6: Recycled Water Quality R
Page 61 and 62: Services (DHS) to establish water r
Page 63 and 64: „Secondary treatment‟ means the
Page 65 and 66: 6.4.4 Section 401 of the Clean Wate
Page 67 and 68: Section 7: Master Plan Development
Page 69 and 70: ● ● ● ● ● To maximize rec
Page 71 and 72: annually. This inconsistency can be
Page 73 and 74: Each workshop conducted in 2001 was
Page 75 and 76: Section 8: Development of Projects
Page 77 and 78: Table 8.1 Recycled Water Facilities
Page 79 and 80: Section 9: Recycled Water Infrastru
Page 81 and 82: Several options exist for efficient
Page 83: Reservoir outlet facility to Diamon
Page 87 and 88: 9.5.1 Project Description Improveme
Page 89 and 90: monitoring and SCADA control system
Page 91 and 92: Pressure required to allow full fun
Page 93 and 94: elatively minor in comparison to op
Page 95 and 96: Section 10: Recycled Water Manageme
Page 97 and 98: with recycled water. This and other
Page 99 and 100: Section 11: Fresh Water Infrastruct
Page 101 and 102: Like Project No. 14 (page 11-81), p
Page 103 and 104: available storage volume of the Res
Page 105 and 106: Section 12: Fresh Water Management
Page 107 and 108: Section 13: Master Plan Implementat
Page 109 and 110: 13.2 Recycled Water Production Trig
Page 111 and 112: Ranch Total Acreage Table 13.1 - Ac
Page 113 and 114: 13.3 Regulation Triggered Project I
Page 115 and 116: District to realize an economic ben
Page 117 and 118: pipeline from the beginning of the
Page 119 and 120: 13.8 Capital Improvement Plan The M
Page 121 and 122: 2) Construct Project No.‟s 1, 2,
Page 123 and 124: 13.9.3 Groundwater Monitoring Recom
Page 125 and 126: It is recommended that District imp
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October 2009 - South Tahoe Public Utility District

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