Overview of the Embankment Remediation Project of the Embankment Remediation Project November, 2013...

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