October 2009 - South Tahoe Public Utility District

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The Master Plan projects include three classifications, namely recommended projects, contingent projects and future projects as described in Section 8. A Decision Tree presented in Figure 13.1 (at the end of Section 13) lists project implementation considerations based on various triggers to compensate for increased recycled water production, changes in available application areas for recycled water, or changes in application rates resulting from application technology or regulations. There are three trigger mechanisms discussed in greater detail in the following subsections. This section also includes a capital improvement plan for construing the recycled water infrastructure projects, and a description of the future projects identified in the Master Plan. Lastly, a list of summary recommendations is provided. 13.1 Development Triggered Project Implementation Development triggered project implementation includes projects that result in additional lands being used as application areas as well as application of technology projects that increase the amount of water consumed on an acre-feet per acre basis. The latter project type includes high water consuming projects, where the increased application areas include the use of the Diamond Valley property, expansion of Alpine County agricultural lands, and export of excess recycled water to Nevada. The potential for loss of application areas in Alpine County is difficult to assess. With the proper incentive for contract irrigators to use the recycled water and maintain existing ranching practices, it is possible to lose very little of the existing application areas. However, with the trend of large ranches being fragmented into smaller, less efficient ranches, and the prospect of ranches being more valuable as semi-rural home sites, the potential for the development of the application areas exists. The Decision Tree, Figure 13.1 (at the end of Section 13), indicates several directions for development triggered project implementation. The first and easiest to implement is the expansion of recycled water application in Diamond Valley, including the recycled water required to support the irrigation fields. An acre of application area lost from the system results in an approximately 3.25 acre-feet annual additional direct land application requirement that needs to be developed in the system. The 3.25 acre-feet per year direct land application rate is an assumed rate used for planning purposes in this Master Plan and can be verified through the preparation of Nutrient Management Plans. For comparison purposes Table 13.2, (page 13-93) Annual Flow and Application Acreage Data, develops values using a range of other possible application rates. South Tahoe Public Utility District Recycled Water Facilities Master Plan - October 2009 Page 13-90
13.2 Recycled Water Production Triggered Project Implementation Data provided in Section 5 indicate an increase in recycled water production in the next 20 years. The following summarizes recycled water volumes, the acreage required for direct application to land, and the corresponding surplus or deficiency for the years 2008 and 2028. Year 2008 • Harvey Place Reservoir Release: 4,738 Acre-feet • Acreage Required for Direct Land Application: 1,458 Acres • Application Land Deficiency: 3 Acres (based on a 3.25 acre-feet/acre/year recycled water application rate Year 2028 • Harvey Place Reservoir Release: 5,848 Acre-feet • Acreage Required for Direct Land Application: 1,799 Acres • Application Land Deficiency: 344 Acres (this stated deficiency does not include the potential acreage for irrigation with recycled water at the Diamond Valley Ranch The annual peak recycled water outflow from Harvey Place Reservoir was 4,738 acre-feet in 2007 and is estimated to increase to 5,848 acre-feet by 2028 (See Tables 13.1 and 13.2, page 13-93). Using a planning application rate of 3.25 acre-feet per acre per year, 1,458 acres are required for recycled water application in the year 2008 while 1,799 acres are required in the year 2028. Currently (2008) recycled water is being applied to 1,455 acres of 1,883 permitted acres. Sufficient application acreage is not currently available (1,455 acres actual versus 1,458 acres needed); the direct land application deficiency is projected to increase by 2028 (1,455 acres actual versus 1,799 acres needed). Sufficient application acreage is available in 2028 if additional permitted acreage is utilized (1,883 acres permitted versus 1,799 acres needed), however, utilization of additional permitted acreage may be difficult due to topographical land constraints. To determine application volumes for the blended water irrigators Bruns, Gansberg and Neddenriep, an estimate was made of the delivery of the ranchers‟ water rights on the West Fork of the Carson River. The available water supply from the West Fork was estimated using data from the USGS gauging station at Woodfords (Appendix C), and compared to the cumulative West Fork water right allotments (Appendix G). Ranchers whose water rights fall below average river flow matches of the cumulative column for a given month of the irrigation season do not receive water for that month. The delivery volumes are summarized in Appendix G. The above evaluation does not account for application of blended water or the 20% additional capacity desired by the District. Four ranches currently blend fresh water with recycled water which increases the amount of recycled water runoff. A summary of blending practices per ranch is shown in Table 13.3 (page 13-94). An estimate of the average amount of fresh water available to the four ranches is 2,643 South Tahoe Public Utility District Recycled Water Facilities Master Plan - October 2009 Page 13-91
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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
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Section 3: Existing Freshwater Syst
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Figure 3.2: Indian Creek Reservoir
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Section 4: Existing Recycled Water
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Farm lateral must be intact to util
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4.2.1.3 Neddenriep Ranch Partnershi
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Development in areas currently rece
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Flow (MGD) Section 5: Flow Projecti
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Table 5.0: Recycled Water Flow and
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Volume of Recycled Water (AFY) Tabl
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estimated 2028 population of 33,900
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Figure 5.2.1(b): NO 3-N versus Time
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Figure 5.2.1(f): Total Dissolved So
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Page 61 and 62: Services (DHS) to establish water r
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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 and 84: Reservoir outlet facility to Diamon
Page 85 and 86: 9.4.1 Project Description The desig
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: Section 13: Master Plan Implementat
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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