The Final Phase of San Clemente Dam Removal and Stream Restoration
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1 The Final Phase of San Clemente Dam Removal and Stream Restoration Godwin, W., Waeber, J., Wade, D, and McGowan, W Annual Meeting, Association of Environmental & Engineering Geologists Kona, Hawaii September 21, 2016 Technical Session #1 Presented By: William Godwin, P.G., C.E.G.
2 Outline Project Location and History Project Overview Geology Final Design Elements Final Construction Phases Dam Removal(s) Instrumentation and Monitoring Questions 2
3 Project Location 3
4 History of San Clemente Dam Constructed between 1920 & 1921 by PIC Owned and operated by California American Water Built for drinking water storage for Monterey Peninsula Fish ladder added later 4
5 History of San Clemente Dam Built in V-notch canyon below confluence of San Clemente Creek and Carmel River Concrete arch dam 106 feet high 300 foot width 1425 acre-feet now 70 acre-feet Over 2.5 million cubic yards of sediment 5
6 Project Overview 6
7 Project Overview 1990 s CDWR DSOD issued safety order Potential failure during MCE (7.0M Tularcitos fault) or PMF 2006 released a draft EIS EIR Alternatives: Dam Strengthening ($50M) Dam Removal 2008 CAW preferred removal of the dam. Benefits: fish access, sediment replenishment, removal of hazard Previous investigations by URS, MWH, Woodward-Clyde and Kleinfelder URS provided an indicative design 7
8 Project Overview - Layout Former Location Of Dam Stabilized Sediment Slope Combined Flow Reach Upper San Clemente Creek Reroute Channel Sediment Stockpile Upper Carmel River Reach Diversion Dike 8
9 Project Overview Key Stakeholders $83M cost Funding: California American Water California Department of Fish & Wildlife California Natural Resources Agency California Wildlife Conservation Board California State Coastal Conservancy National Marine Fisheries Service NOAA Resources Legacy Fund The Nature Conservancy United States Fish & Wildlife Service 9
10 Project Overview Project Team/Schedule Granite Construction General Contractor Kleinfelder Engineer of Record (EOR) and lead Civil/Geotechnical designer Tetra Tech H/H modeler, Channel Restoration design Rana Creek, Habitat Restoration Oversight AECOM Owners Engineer WSC Construction Mgr Season: Geotechnical Investigation, initial diversion structures, overall design 2014 Season: Reroute Cut, Diversion Dike, Sediment Stockpile, design/construct 2015 Season: Stabilized Sediment Slope, dam removal, CFR channel design/construct 10
11 Regional Geology Jennings
12 Site Geology History Lt Mesozoic of Dam Project Background Project Overview Geology Metasedimentary of Location Geotechnical Investigation Challenges Summary Lt Mesozoic Quartz Diorite Granodiorite Early Mesosoic & Granitic Rocks Lt Mesozoic Granodiorite Lt Mesozoic Quartz Monzonite Miocene Sandstone Early Mesosoic Metasedimentary & Granitic Rocks Dibblee, T.W., and Minch, J.A., Geologic map of the Carmel Valley quadrangle, Monterey County, California, published by Dibblee Geological Foundation in 2007, 12
13 2015 Final Design Elements Dam Demo Plan Stabilized Sediment Slope Combined Flow Reach Upper Carmel River Reach Habitat Restoration 13
14 Diversion Dike (DD) Design 14
15 Stabilized Sediment Slope (SSS) Design 15
16 Combined Flow Reach (CFR) Design 16
17 CFR Design Step Pool Plan 17
18 CFR Design - Step Pool Elevation 18
19 2015 Final Construction Elements Final Reservoir Drain Remove Dam and Slide Debris Complete Stabilized Sediment Slope Construct Combined Flow Reach Restore San Clemente Creek Reroute Rock Sill Grade Upper Carmel River Reach Top off Sediment Stockpile Remove Diversion Pipe and Cutoff 19
20 Construction Christmas Slide/pipe repair Dec landslide; Mar debris removal and pipe repair June 2015 right abutment and diversion pipe 20
21 Construction Reservoir Dewatering 21
22 Construction - Diversion Dike (DD) October 2014 view NE October 2015 view SW 22
23 Construction Reroute Channel Rock Sill 23
24 Construction Reroute Channel Rock Sill 24
25 Construction SSS foundation mapping Toe of SSS Transition beneath SSS 25
26 Construction Geologic Strip Mapping Potential for catastrophic landsliding and stream blockage 26
27 Evaluation Catastrophic Landslide Risk Geologic Map of Combined Flow Reach. 27
28 Evaluation Catastrophic Landslide Risk Failure of CFR valley ways leading to stream blockage due to runout. Evaluation Methodology: Inputs: Geologic data (borehole, strip mapping, GSI, RMR) Scour Analysis (1000 flood event WSE, Erodibility Index K) Slope Stability (K h = 0.2 (1/2 of pga) Analysis: Scour by Annandale (1995) of Required Stream Power vs K; Rock Mass Erodibility Index; Limit Equilibrium method for Slope Stability 28
29 Evaluation Catastrophic Landslide Risk Geomechanical Model, Section 2 Pseudostatic Analysis, Section 2 29
30 (De) construction dam removal Upstream Ramp and use Pneumatic hammer Recycle rebar, bury concrete in SSS Sigh..No Explosives 30
31 (De) construction DSOD Concerns Left Abutment Rockfall Right Abutment Stability 31
32 Boulders for CFR Pools - Material Testing Drop Test at various quarries to measure durability. Eventually used mostly concretions from two quarries in Livermore valley 32
33 Construction CFR pool construction Step Pool sequence Field Supervision 33
34 Instrumentation installation and monitoring Slope inclinometers (SI) along former reservoir rim and top of engineered embankments Time Domain Reflectometers (TDR): Deformation at depth No magnitude Reflective Survey Monuments: All over slope Measured biannually Vibrating Wire Piezometers Instrumentation data collection 34
35 Instrumentation installation and monitoring TDR for Reroute, Left Slope Slope Inclinometer for SSS 35
36 Removal of 1883 Old Carmel River Dam 36
37 Sleepy Hollow Ford Bridge Construction 37
38 Path Forward 5 year monitoring period Slope stability and erosion reconnaissance Instrumentation measurements (Slope Inclinometer, VWP, TDR and surface settlement markers) Additional monitoring via Triggering Events - 4.0M EQ w/in 50 miles - 10yr flood event (>3,600 cfs) Habitat die-off/ replacement Win-win for everyone Dam removal for safety Restore ecological balance Turnover to BLM 38
39 Acknowledgements Aman Gonzalez - California American Water Brian Hussar Granite Construction Company Craig Hall, GE GEI Morley Beckman, PE Kleinfelder Jeff Richmond, CEG Kleinfelder Kami Deputy, PE Shannon & Wilson Merideth Beswick, PE, GIT - Kleinfelder 39
40 QUESTIONS? 40
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