Design And Construction Of The South San Diego Bay Western Salt Pond Restoration Project Headwaters To Ocean Conference

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1 Design And Construction Of The South San Diego Bay Western Salt Pond Restoration Project 2012 Headwaters To Ocean Conference David Cannon, M.C.E., P.E. President/Principal Engineer Everest International Consultants, Inc. 1

2 Funding Provided By: Southwest Wetlands Interpretative Association U.S. Fish and Wildlife Service Coastal Restoration Program Refuges California State Coastal Conservancy NOAA Fisheries Port of San Diego 2

3 Project Team USFWS (CRP & Refuges) California State Coastal Conservancy Southwest Wetlands Interpretative Association Everest International Consultants Nordby Biological Consultants TerraCosta Consulting Group Merkel & Associates Anchor-QEA Others Monitoring Surveying 3

4 South San Diego Bay Salt Pond Complex 4

5 Western Salt Ponds Three Ponds Pond 11 Pond 10 Pond 10a Approx. 217 Acres Primary Salt Production Ponds Siphon Connected Pond 10 To Pond 12 5

6 Project Summary Construct New Tide Gate At Pond 12 Demolish Siphon Dredge 147,200 yd 3 From Ponds 10 & 11 Place Dredged Material In Pond 11 Remove Existing Tide Gate Breach Levees To Restore Tidal Exchange Plant Vegetation In Pond 10 Conduct Long Term Monitoring 6

7 Design Challenge Balance Habitat Goals & Funds Challenges Original Goal To Maximize Intertidal Place Fill To Maximize Intertidal Desire To Consider Historical Channels Dredge High Areas To Create Channels Funding Changes Impacted Habitat Goals Reduction Of Material Coming From CVWR Solutions Reduce Fill Needed In Ponds 10 and 11 Focus On Meeting Habitat Goals In Pond 10 Relocate Channels To Reduce Dredging 7

8 Historical Channel Network 8

9 Habitats Plan Existing Elevations 9

10 Final Habitat Plan 10

11 11

12 12

13 13

14 First Day Of Construction Overzealous Excavation 14

15 Second Day Of Construction Finally Dredging 15

16 Third Day Of Construction Dredge Out Of Action 16

17 Dredged Material In Pond 11 17

18 Construction Challenge Payment Verification Challenge Pay Based On Dredged Volume Dredged Volume Based On Surveys Infrequent Surveys Increase Liability Frequent Surveys Increase Cost Soft Sediments Make Survey More Difficult Solution Conducted Weekly Surveys Pay Quantity Analysis Performed In Two Days Verification/Problems Reported In Three Days Remedial Measures Bundled Together Final Observation Required Before Demobilization 18

19 Dredging Payment Verification Examples of Acceptable Work Existing Proposed Tolerance Constructed Horizontal Tolerances: Channel Alignment: ± 10 ft, Channel Bottom Width: +2 ft Vertical Tolerances: Channel Bottom Elevation: -1.0 ft, Channel Slope: ±0.5 ft 19

20 Earthwork Payment Verification Examples of Unacceptable Work Existing Proposed Tolerance Constructed Horizontal Tolerances: Channel Alignment: ± 10 ft, Channel Bottom Width: +2 ft Vertical Tolerances: Channel Bottom Elevation: -1.0 ft, Channel Slope: ±0.5 ft 20

21 How Did We Do? Final Habitat Plan 21

22 Salt Pond Oct.26, 2011 Tide: -1.4 NAVD88 22

23 Construction Challenge Maintain Flood Protection Challenge Low Lying Bike Path Between Ponds 10 and 10a High Tides Can Cause Flooding Project Will Allow Full Bay Tide Range Will Project Increase Extent or Frequency Solution Conducted Focus Survey Of Bike Path Performed Tidal Hydraulic Analysis Observed Low Areas During High Tide Modified Grading To Reduce Flood Risk 23

24 Bike Path Between Pond 10/10A N Eastern Side Looking South Source: Google Earth Pro 24

25 Frequency (days) NOAA Daily High Tide Elevations (19 Years - 6,940 Days) Bikepath Flooded (34 events in 19 years, average approximately twice a year) High Tide Elevation (ft, NAVD88)

26 Topographic Survey 9/19/2011 Pond 10 A Low Point A Pond 10A 26

27 Cross Section A-A at Low Point Pond 10A Pond

28 Flooded Areas Near Low Point of Bikepath High Tide Elevation in ft, NAVD88 (# of Events in Epoch; Frequency) 7.5 Tide (1; 0.01%) 7.4 Tide (4; 0.06%) 7.3 Tide (11; 0.16%) 7.2 Tide (18; 0.26%) 7.1 Tide (31; 0.45%) 7.0 Tide (50; 0.72%) 28

29 Dredging Summary Schedule Summary Target Date: Jan. 31, 2011 Actual Date: Jan. 31, 2012 Target Date: Apr. 30, 2011 Actual Date: Oct. 21, 2011 Volume Summary Designed: 147,200 yd 3 Dredged: 175,500 yd 3 Paid: 147,900 yd 3 Cost Summary Budgeted = $2.70 Million Bid Award = $2.31 Million (Burt W. Salas) Final Paid = $2.36 Million (One CO) 29

30 We Built It And They Came Thank You! 30

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