SALTON SEA MANAGEMENT PROGRAM NORTH LAKE/WHITEWATER AREA PLANNING

SALTON SEA MANAGEMENT PROGRAM NORTH LAKE/WHITEWATER AREA PLANNING

SALTON SEA MANAGEMENT PROGRAM NORTH LAKE/WHITEWATER AREA PLANNING ISSUES Concept Discussions Internal Review Draft June 12, 2018 1 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 CROSS-SECTION 4

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): 1.8 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: ~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 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 drains Typically 1-4 ppt 9 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 (CVSWC) = 40 TAFY Inflow needed ~12 TAFY Local drains = 11 TAFY 11Note: TAFY = Thousand Acre-Feet/Year 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 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 may be only practical inflow method 14 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 FOLLOWUP Comments, questions & information welcome Email to: [email protected] 17 CVWD Coachella Valley Stormwater Channel and Agricultural Drain Flow (AFY) Drain BACKUP McKinley Cleveland 0.5

2012 610 2013 730 2014 678 2015 672 2016 693 683 626 680 704 771 654 621 Caleb Channel 1,173

1,207 1,211 1,019 1,006 826 Cleveland East 378 380 378 380 381 381 Cleveland West 378 378 378

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 1,764 236

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. 3,997 4,551 4,201 3,576 3,407

3,667 CVSWC 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 Hayes 0.5 Oasis-Grant 18 2011 F Channel

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