SALTON SEA MANAGEMENT PROGRAM NORTH LAKEWHITEWATER AREA PLANNING

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SALTON SEA MANAGEMENT PROGRAM NORTH LAKE/WHITEWATER AREA PLANNING ISSUES Concept Discussions Internal Review Draft

SALTON SEA MANAGEMENT PROGRAM NORTH LAKE/WHITEWATER AREA PLANNING ISSUES Concept Discussions Internal Review Draft June 12, 2018

GOALS AND OBJECTIVES �Habitat for key species �Multi-species fish habitat �Food source for birds

GOALS AND OBJECTIVES �Habitat for key species �Multi-species fish habitat �Food source for birds �Water supply pond for future habitat and dust mitigation projects 2

PRELIMINARY Whitewater River/Coachella Valley Stormwater Channel (CVSWC) 3 CONCEPTUAL LAYOUT

PRELIMINARY Whitewater River/Coachella Valley Stormwater Channel (CVSWC) 3 CONCEPTUAL LAYOUT

PRELIMINARY CROSS-SECTION 4

PRELIMINARY CROSS-SECTION 4

NORTH LAKE PLANNING – KEY ISSUES �Water quality �Salinity �Inflow sources & quantities �Storm

NORTH LAKE PLANNING – KEY ISSUES �Water quality �Salinity �Inflow sources & quantities �Storm flow routing �Gravity vs pumping �Pond elevation 5

WATER QUALITY DATA: SELENIUM � Inflows (5 yr avg) � Whitewater River (CVSWC): 1.

WATER QUALITY DATA: SELENIUM � Inflows (5 yr avg) � Whitewater River (CVSWC): 1. 8 ppb � Other Drains: 3 -8 ppb � New USEPA draft criteria (2016) for Se � 1. 5 ppb in ponded water � 3. 1 ppb in flowing waters � Previous (1987) chronic criterion: 5 ppb � New criteria recognize fish tissue data supersede water column values (8. 5 mg/kg, whole body) 6 Note: ppb = parts per billion

WATER QUALITY DATA: OTHER PARAMETERS �Nutrient levels typical of highly eutrophic waters � Nitrogen:

WATER QUALITY DATA: OTHER PARAMETERS �Nutrient levels typical of highly eutrophic waters � Nitrogen: ~15 ppm, � Phosphorus: ~2 ppm � Nitrogen limited, i. e. , there is excess phosphorus �Total suspended solids moderately high: ~100 ppm 7 Note: ppm = parts per million

WATER QUALITY DECISIONS �Are selenium levels acceptable for creating habitat? �Treatment options: �Sediment basins

WATER QUALITY DECISIONS �Are selenium levels acceptable for creating habitat? �Treatment options: �Sediment basins �Treatment wetlands �Mixing in ponds �Inflow options �Whitewater River vs Drains 8

SALINITY �Salinity in the Whitewater River �Typically <1 ppt (parts per thousand) �In other

SALINITY �Salinity in the Whitewater River �Typically <1 ppt (parts per thousand) �In other drains �Typically 1 -4 ppt 9

SALINITY OPTIONS �Possible targets �Nearly fresh: No pumping of Salton Sea water, vs �

SALINITY OPTIONS �Possible targets �Nearly fresh: No pumping of Salton Sea water, vs � 15 -20 ppt: Pumping Salton Sea water � Capital, O&M, energy costs, or �Greater than 20 ppt: More pumping � More costs 10

Coachella Valley Flows (6 -yr avg) All other drains = 34 TAFY Whitewater R

Coachella Valley Flows (6 -yr avg) All other drains = 34 TAFY Whitewater R (CVSWC) = 40 TAFY Inflow needed ~12 TAFY Local drains = 11 TAFY 11 Note: TAFY = Thousand Acre-Feet/Year

INFLOW SOURCES & QUANTITIES �Whitewater River only �Limits pond sizes �Whitewater flows are seasonal

INFLOW SOURCES & QUANTITIES �Whitewater River only �Limits pond sizes �Whitewater flows are seasonal �Whitewater plus drains �Increases pond sizes but lowers water quality �Include groundwater? �Shallow or deep 12

STORM FLOW ROUTING OPTIONS �Flow through ponds � Requires means to pass through floods

STORM FLOW ROUTING OPTIONS �Flow through ponds � Requires means to pass through floods � Examples: inflatable dam or large spillway needed �Diversion around ponds � Requires diversion system or pumping plant � Breaks interconnectivity of ponds east and west of the Whitewater mouth 13

GRAVITY VS PUMPING �Gravity feed �Avoid pumping costs �Complicated plumbing �Pumping �Added cost, but

GRAVITY VS PUMPING �Gravity feed �Avoid pumping costs �Complicated plumbing �Pumping �Added cost, but may be only practical inflow method 14

POND ELEVATION OPTIONS �Within historic Salton Sea footprint (-228’ NGVD 1928) �Easier connectivity with

POND ELEVATION OPTIONS �Within historic Salton Sea footprint (-228’ NGVD 1928) �Easier connectivity with other planned improvements �Above Salton Sea footprint 15

Project Area (Slide 3) LAND OWNERSHIP 16

Project Area (Slide 3) LAND OWNERSHIP 16

FOLLOWUP �Comments, questions & information welcome �Email to: �Salton. Sea@tetratech. com 17

FOLLOWUP �Comments, questions & information welcome �Email to: �Salton. [email protected] com 17

CVWD Coachella Valley Stormwater Channel and Agricultural Drain Flow (AFY) Drain BACKUP 2012 2013

CVWD Coachella Valley Stormwater Channel and Agricultural Drain Flow (AFY) Drain BACKUP 2012 2013 2014 2015 2016 Mc. Kinley 610 730 678 672 693 683 Cleveland 0. 5 626 680 704 771 654 621 Caleb Channel 1, 173 1, 207 1, 211 1, 019 1, 006 826 Cleveland East 378 380 381 Cleveland West 378 378 377 379 Arthur 0. 5 847 934 841 893 814 851 Arthur St. 1, 461 1, 574 1, 416 1, 530 1, 689 1, 746 Garfield 0. 5 653 703 547 553 482 534 Garfield St. 1, 647 1, 851 1, 732 1, 422 1, 842 1, 764 Hayes 0. 5 236 169 239 215 208 221 Hayes 1, 893 1, 658 1, 977 2, 071 2, 014 2, 075 Grant 0. 5 1, 343 1, 430 1, 328 741 953 1, 067 Grant St. 2, 475 2, 461 2, 474 2, 264 2, 397 2, 387 Johnson St. CVSWC 18 2011 3, 997 4, 551 4, 201 3, 576 3, 407 3, 667 32, 474 34, 359 42, 265 42, 237 41, 221 47, 262 Ave 74 403 414 379 383 187 298 Ave 76 1, 810 1, 854 1, 862 1, 629 1, 602 2, 357 A Channel 3, 175 3, 910 3, 632 2, 341 1, 616 2, 056 Ave 79 1, 253 1, 212 1, 266 1, 496 1, 218 1, 592 Lincoln-Oasis 4, 729 4, 840 4, 684 4, 595 3, 975 4, 209 C Channel 1, 368 1, 347 810 843 587 709 D Channel 1, 976 1, 604 1, 243 1, 222 850 933 Ave 83 1, 037 1, 089 1, 264 987 921 963 E Channel 1, 510 1, 843 1, 745 1, 469 1, 281 1, 859 715 925 533 459 385 529 7 1 13 0 0 0 Oasis-Grant F Channel