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Overview of the Embankment
Remediation Project
November, 2013
Perris Dam Remediation Project
Location of Perris Dam and Lake
Perris Dam Remediation Project Slide 2
State Water
Project
Perris Dam Remediation Project Slide 3
Perris Dam Location and Local Faults
San Jacinto Fault Zone Magnitude Mw7.5 5 miles from fault
Dam Features
• Construction 1970 – 1972
• Type of Dam – Earthfill
• Dam Height – 126 feet
• Dam Length – 2.2 Miles
Perris Dam Remediation Project Slide 4
Embankment Design and Construction
• Embankment Section
– Primarily Silty Sand
– Inclined Sandy Clay Core
– Compaction Requirements
• DWR Standard
– (20,000 ft-lb/ft3)
ZoneSpec.70-25
AverageAs-Placed
1 97% 98%
2 97% 101%
Zone 1
Zone 3
Zone 4
Zone 2Zone 2
Crest El. = 1600 ft
Toe El. = 1480 ft
4
1 3.2
1
3
1
1
1
0.5
1
Zone 2
10' Riprap
Dam Axis
Bench
Perris Dam Remediation Project Slide 5
Embankment Design and Construction
• Foundation Preparation
– 3 ft excavation beneath Zone 2
• Remove organic material & loose surface sands
– 6 ft excavation beneath Zone 1 (core)
• 10-25 ft Core Trench
Perris Dam Remediation Project Slide 6
Example Cross Section Evaluation
Perris Dam Remediation Project Slide 7
SS-41M
(SM,86):{67}(ML,68):{54}
(SM,98):{74}(SM,93):{71}
(SP,67):{50}
(SM/ML,40):[SC-SM,6]:{31}
(SM/ML,55):{42}
(SC,61):{47}
(SC,28):[SC,11]:{22}
(ML,66):{50}
(ML,86):{64}(N1)60cs=30
SS-41MU
((ML)s,36):[CL,12]:{31}(ML,60):{52}
(s(ML),73):{61}(s(ML),64):{54}
(ML,34):[CL,14]:{29}(ML,42):[SC,9]:{35}
((ML)s,36):[SM,0]:{30}
(SM,100):{79}
(ML,42):[SC-SM,6]:{34}
(ML,44):{36}(N1)60cs=30
SS-41MUA
(N1)60cs=30
SS-41ML
((ML)s,33):[SM,0]:{32}((ML)s,32):[SC-SM,6]:{32}
(ML/CL,38):{37}
(SP-SM,38):{36}(SP,39):{35}
(SC,49):{46}
((ML)s,33):[SC-SM,6]:{31}
(ML,41):[SM,0]:{37}
(ML,46):{41}
(SM,58):{51}(N1)60cs=30
SS-41MFF1
(SP-SM,23):{33}(SM,49):{72}(SM,28):{43}(SM,28):{43}
(SM,36):{52}(SM,44):{62}(SM,51):{70}(SC,42):{58}
(SP-SM,40):{47}
(SM,40):{50}
(SM,42):{51}
(SP-SM,49):{54}
(SM,43):{50}
(SM/SC,50):{58}
(SM,49):{55}
(s(ML),33):{38}
(s(ML),84):{90}
(SP-SM,54):{55}(N1)60cs=30
SS-41MFF2
(SM,51):{72}(SM,35):{51}
(SM/SC,33):{48}(SP-SM,28):{37}
(SM,52):{71}(SM,41):{57}(SM,40):{55}(SM,53):{71}
(SM/SC,32):{43}(SM/SC,31):{41}
(SM,31):{41}
(SP-SM,42):{49}
(SM/SC,36):{45}
(SM/SC,57):{67}
(SM,36):{41}
(SM/SC,54):{62}
(CL,21):[CL,24]:{26}
(CL,35):{40}
(CL,36):{41}
(CL,41):{46}
(SM,76):{79}
(SM,70):{72}(N1)60cs=30
SCPT-82
qc1Ncs=160
CPT-83
qc1Ncs=160
CPT-84A
qc1Ncs=160
Zone 1
Zone 2Zone 3/4
Deep Alluvium
Weathered Rock
Bedrock
Section 99+22
(SP-SM,68):{53}
(SP-SM,27):{32}
(ML,34):[SC,8]:{29}(ML,100):{82}
(ML,85):{71}
2007 Survey
(Field Class, N):[Lab Class, PI]:{ (N1)60cs }
Example SPT
Legend
Label
SBT 3 - Clay to Silty Clay
SBT 4 - Clayey Silt to Silty Clay
SBT 5 - Silty Sand to Sandy Silt
SBT 6 - Clean Sands to Silty Sands
SBT 7 - Gravelly Sand to Sand
SBT 8 - Very Stiff Sand to Clayey Sand
SBT 9 - Very Stiff Fine Grained
SCALE
1: 480
(SC,32):{44}
FC=44%
FC=39%
FC=32%(SM,15):[CL,14]:{28}(SM,14):[CL,10]:{27}
(SM/SC,25):{39}(SM/SC,17):{30}(SM/SC,18):{33}
(SM,19):{30}
FC=39%(SC,19):[SC,9]:{20}(SC/SM,50):[SC-SM,4]:{47}
(SC,47):{58}(SC,45):{54}
(SC/SP,40):[SC,9]:{48}
(SC,20):[CL,10]:{26}
(SP-SM,26):[SC,10]:{31}
(SP-SM,40):{44}
(SM,59):{62}
(SP,33):[SC-SM,5]:{35}
(SP,41):{40}
(SP,48):{46}(N1)60cs=30
Projected from Section-41
SS-63
FC=53%
1590
1560
1570
1580
1520
1530
1540
1550
1490
1500
1510
1480
1470
1440
1450
1460
1420
1430
1410
1400
1390
1380
1370
1360
1350
1340
1330
1320
1310
1300
1290
1280
1270
Elev
atio
n (
ft)
1600
Material gmoist (pcf) gsat (pcf) n K2,max f ' (deg) c' (psf) f (deg) c (psf) Kh (ft/day) Kh / Kv
Zone 1 128 134 0.35 100 22 600 14 1000 0.01 10
Zone 2 134 139 0.35 100 33 0 13 1800 0.1 10
Zone 3 134 139 0.35 100 40 0 40 0 5 1
Zone 4 134 139 0.35 100 40 0 40 0 5 1
Shallow Alluvium 129.5 136 0.35 160 35.5 0 23 500 0.5 10
Deep Alluvium 129.5 136 0.35 160 35.5 0 14 2300 0.5 10
Weathered Rock 145 145 0.32 N/A N/A N/A N/A N/A 0.5 10
Bedrock 165 165 0.28 N/A N/A N/A N/A N/A 0.01 10
(SP-SM,24):[SC-SM,4]:{20}
(N1)60cs = 18,(N1)60cs-Sr = 15
Shallow Alluvium(Filter,73):{58}
(ML,31):[CL-ML,7]:{28}(ML,12):[SC-SM,6]:{13}
(SM/SC,48):[SC,10]:{42}(SM/SC,40):[SC,11]:{35}
(ML,19):[SM,0]:{21}(SM,19):[SC,13]:{20}
(SC,35):{35}((ML)s,12):{14}(ML,24):[SC-SM,5]:{22}
(s(ML),12):[SC-SM,5]:{12}
(SP,16):[SC-SM,7]:{24}(SP,12):[SM,0]:{17}
(SP-SM,7):[SC,8]:{16}
(SM/SC,0):[SC-SM,6]:{0}(SM,10):[SC,12]:{21}FC=37%
(SM,32):[SM,0]:{26}
(SP-SM,29):{27} (SM,21):{24}
FC=42%
(SM,22):{34}
(N1)60cs = 19,(N1)60cs-Sr = 16 (N1)60cs = 21,(N1)60cs-Sr = 19
(N1)60cs = 21,(N1)60cs-Sr = 19
(N1)60cs = 15,(N1)60cs-Sr = 13
(N1)60cs = 20,(N1)60cs-Sr = 17
(N1)60cs = 26,(N1)60cs-Sr = 23
(N1)60cs = 25,(N1)60cs-Sr = 23
Summary of Field Exploration
SPT Drill Holes = 120
SPT’s = 1,318
CPT Drill Holes = 139
Remediation
Zone
Perris Dam and Lake
Perris Dam Remediation Project Slide 8
Dam Safety and Design
• Division of Safety of Dam (DSOD) – Dam regulator to ensure a safe design
– Approve design analysis, plans, and specifications
– Oversees the construction in accordance with the approved plans
and specifications
• Board of Consultants (BOC) – Appointed by the Director of DWR
– Formed by a group of experts
– Perform independent review of the dam design.
– Approve design work for construction
Perris Dam Remediation Project Slide 9
Design Concept
• Remove and replace loose shallow soils.
• Improve the deeper foundation soils by Cement
Deep Soil Mixing (CDSM)
• Construct a stability berm on the downstream side
of the dam
Perris Dam Remediation Project Slide 10
Perris Dam Remediation Project Slide 11
• Clearing and Grubbing
• Lake Bed Haul Roads
• Sitework
• Production Blasting
• Controlled Blasting
• Rock Processing and Stockpiling (Filter and Drain)
• Dewatering at Dam Toe and Borrow Area
• Seepage Collection System (Remove and Replace)
• Relief Well System (Remove and Replace)
• Cement Deep Soil Mixing (CDSM)
• Stability Berm
• Right Abutment Dam Repair
Perris Dam Remediation - Construction
Contract - Scope of Work
Perris Dam Remediation Project Slide 12
Project Overview
Foundation Treatment and Stability Berm
Perris Dam Remediation Project Slide 13
Perris Dam Remediation Project Slide 14
Foundation Treatment
CDSM
Berm
Removal and
Replacement
New Haul Road
Outlet Structure
Controlled Blasting
Perris Dam Remediation Project Slide 15
Controlled Blasting
Perris Dam Remediation Project Slide 16
•Low ground velocity restriction
•Protect existing facilities
Production Blasting
Perris Dam Remediation Project Slide 17
Production Blasting
Perris Dam Remediation Project Slide 18
Rock Processing and Stockpile
Perris Dam Remediation Project Slide 19
•Rock from Blasting used
for Filter and Drain System
•Cleanness requirements
•Segregation requirements
•Limited Areas
Seepage Collection System
Perris Dam Remediation Project October 31, 2013 Slide 20
•Remove existing wells and drain system
•Existing system flowing water
•Construct new system at berm
Design Phase Test Sections
• DWR conducted testing to evaluate design and
construction of the foundation treatment,
dewatering, and other construction features.
• Identified potential problems
• Provided confidence in the design
• Refined design of foundation repairs. Resulted in final design
with shallower excavation and confirmed CDSM treatment.
Perris Dam Remediation Project Slide 21
Test Sections
Dewatering Test
Excavation Area
CDSM Test Section Area
Perris Dam Remediation Project Slide 22
Pre-drilling
Perris Dam Remediation Project October 25, 2013 Slide 23
Soil Mixing using Multi-Auger Method
Multi-Auger Rig
Installing CDSM
Test Cells
Spoil Area
Batch Plant
Perris Dam Remediation Project Slide 24
Soil Mixing Using CSM Method
Perris Dam Remediation Project Slide 25
CDSM
Spoils
Spoil Trench
Soil Mixing Operation
Multi-Auger Method CSM Method
CSM
Spoils
Spoil Trench
Perris Dam Remediation Project Slide 26
Sheet Piles Eductor Wells
Large Dewatering Wells
next view
Perris Dam Remediation Project Slide 27
Evaluated Dewatering Methods
Evaluated Excavation and Drilling Methods
Dewatering Test Excavation
Geologic Investigation
Large Well Large Well
Eductor
Wells
Sheet Piles
Geologic Investigation
Dewatering Test Excavation
Additional Information • Contractor Participation:
– http://www.water.ca.gov/engineering
Perris Dam Remediation Project Slide 29
Additional Information • Contractor Participation:
• http://www.water.ca.gov/engineering/Contracts
Perris Dam Remediation Project Slide 30
Additional Information • Contractor Participation:
• http://www.water.ca.gov/engineering/Contracts
Perris Dam Remediation Project Slide 31
http://www.water.ca.gov/lakeperris/
Perris Dam Remediation Project Slide 32