Overview of the Embankment Remediation Project of the Embankment Remediation Project November, 2013 Perris Dam Remediation Project Location of Perris Dam and Lake Perris Dam Remediation

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 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


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


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


Example Cross Section Evaluation


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


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


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



• 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


Project Overview

Foundation Treatment and Stability Berm



Foundation Treatment

CDSM

Berm

Removal and

Replacement

New Haul Road

Outlet Structure

Controlled Blasting


Controlled Blasting


•Low ground velocity restriction

•Protect existing facilities

Production Blasting


Production Blasting


Rock Processing and Stockpile


•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.


Test Sections

Dewatering Test

Excavation Area

CDSM Test Section Area


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


Soil Mixing Using CSM Method


CDSM

Spoils

Spoil Trench

Soil Mixing Operation

Multi-Auger Method CSM Method

CSM

Spoils

Spoil Trench


Sheet Piles Eductor Wells

Large Dewatering Wells

next view


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


http://www.water.ca.gov/engineering


• http://www.water.ca.gov/engineering/Contracts


http://www.water.ca.gov/engineering/Contracts


• http://www.water.ca.gov/engineering/Contracts


http://www.water.ca.gov/engineering/Contracts

http://www.water.ca.gov/lakeperris/


Documents

Overview of the Embankment Remediation Project of the Embankment Remediation Project November, 2013 Perris Dam Remediation Project Location of Perris Dam and Lake Perris Dam Remediation