Floodplain Management Association- 23nd Annual Fall Conference -

BI-LEVEL SOIL CEMENTAn Environmentally Superior Bank Protection System

BI-LEVEL SOIL CEMENTAn Environmentally Superior Bank Protection System

Presented by

PACIFIC ADVANCED CIVIL ENGINEERING

Problem:

SANTA CLARA RIVER BANK PROTECTION

Problem:

SANTA CLARA RIVER BANK PROTECTION

Issues:

1. Public outcry for different bank protection solution• Less invasive solution (less disturbance)• More usable solution (dry +90% of the time) (vs. Standard Concrete or Rip Rap Bank Protection)

Problem:

SANTA CLARA RIVER BANK PROTECTION

Issues:

1. Public outcry for different bank protection solution• Less invasive solution (less disturbance)• More usable solution (dry +90% of the time) (vs. Standard Concrete or Rip Rap Bank Protection)

2. Environmentally Sensitive Area• ACOE• CDFG (State)• USFWS (Federal Endangered Species)

Problem:

SANTA CLARA RIVER BANK PROTECTION

Issues:

1. Public outcry for different bank protection solution• Less invasive solution (less disturbance)• More usable solution (dry +90% of the time) (vs. Standard Concrete or Rip Rap Bank Protection)

2. Environmentally Sensitive Area• ACOE• CDFG (State)• USFWS (Federal Endangered Species)

3. Public Safety• Flood Control (Protection from Flood & Scour)• In and Around River & Bank Protecton

4. Cost Effective Flood Control Solution

5. Minimal Maintenance Solution

Solution:

BI-LEVEL SOIL CEMENT BANK PROTECTION• Buried and Revegetated

Problem:

SANTA CLARA RIVER BANK PROTECTION

Issues:

1. Public outcry for different bank protection solution• Less invasive solution (less disturbance)• More usable solution (dry +90% of the time) (vs. Standard Concrete or Rip Rap Bank Protection)

2. Environmentally Sensitive Area• ACOE• CDFG (State)• USFWS (Federal Endangered Species)

3. Public Safety• Flood Control (Protection from Flood & Scour)• In and Around River & Bank Protecton

4. Cost Effective Flood Control Solution

5. Minimal Maintenance Solution

Solution:

SOIL CEMENT BANK PROTECTION• Single Level – buried• Bi-Level - buried

Bi-Level Soil Cement Bank Protection - Typical Plan & Section at Residential AreaBi-Level Soil Cement Bank Protection - Typical Plan & Section at Residential AreaBi-Level Soil Cement Bank Protection - Typical Plan & Section at Residential Area

San Francisquito Creek –Existing Concrete Bank Protection

CAP FLOOD

100 YR

Concrete

8” to 10” thick

San Francisquito Creek –Existing Concrete Bank Protection

Map #17949 Rip Rap Bank Protection CASTAIC CREEK

CAP FLOOD

100 YR

Rip-Rap

36” to 54” thick

San Francisquito Creek –Existing Concrete Bank Protection

Map #17949 Rip Rap Bank Protection CASTAIC CREEK

Bank Protection Comparison

CAP FLOOD

100 YR

Concrete8” to 10” thick

Rip-Rap36” to 54” thick

Soil Cement50” to 72” thick

Map #17949 Rip Rap Bank Protection CASTAIC CREEK

San Francisquito Creek –Existing Concrete Bank Protection

Soil Cement Bank Protection at Bridgeport

BRIDGEPORT SOIL CEMENT BANK PROTECTION SUMMARYReach Length: 9,500 LFVolume of Soil Cement: 74,000 c.y. (or 7.8 c.y./LF)

DESIGN PARAMETERSFreeboard: Capital Flood Water Surface + 2 feet (LA County Standard)

(based on HEC-2 model, n=0.085) QCAP = 117,000 cfsToe-down: 10 feet below existing river invert (LA County Standard)

(based on HEC-2 model, n=0.025) VCAP = 12 to 15 fpsBANK PROTECTION

Typical height: Upper level: 10 feetLower level: 19 feet

Typical width: 8 feetSlope of bank protection: 1:1Horizontal distance between levels: ±40 feet

OVERBANK GRADE CONTROL STRUCTURETypical height: 7 feetSpacing between structures: 200-400 feet

SOIL CEMENT MIX DESIGNSoil Type (Unified Classification): SM/SPCement content: 8-11% (includes 2% for erosion)Moisture content: 10.5% (opt. Moisture + 1% for evaporation)7-day compressive strength: 750 psiCompaction requirements: 95% of max. dry density

•Soil•Cement•Water

•Mixing•Compaction

Stockpile Test LocationBridgeport – Valencia, CA

Soil Cement Mixing PlantBridgeport - Santa Clarita, CA

Batch Plant & Stockpile

Set up #1

Set up #2

Batch Plant & Stockpile

Excavation & De-wateringBridgeport - Santa Clarita, CA

Excavation & De-wateringBridgeport - Santa Clarita, CA

Excavation & De-wateringBridgeport - Santa Clarita, CA

Soil Cement Mixing PlantBridgeport - Santa Clarita, CA

Soil Cement PlacementBridgeport – Santa Clarita, CA

Soil Cement CompactionBridgeport – Santa Clarita, CA

Soil Cement PlacementBridgeport - Santa Clarita, CA

Bi-Level Soil Cement - San Francisquito CreekUpper & Lower level soil cement placement & compaction

Bi-Level Soil Cement - San Francisquito CreekPlacement of soil cement for upper & lower levels

Bi-Level Soil Cement at Overbank Grade Control StructureBridgeport - Santa Clarita, CA

Bi-Level Soil Cement at Overbank Grade Control StructureBridgeport - Santa Clarita, CA

Bi-Level Soil Cement - Santa Clara RiverCompleted upper, lower & overbank grade control structure

8 FT LIFTSSoil Cement

Storm Drain (72” diameter) Penetration at Soil CementMTD 1586 – South River Project at Santa Clara River

Santa Clara RiverSanta Clara River

San

Fran

cisq

uito

Cree

k

San

Fran

cisq

uito

Cree

k

BRIDGEPORTBRIDGEPORT

SOUTHRIVER

SOUTHRIVER

QC

AP:

37,4

00 C

FSV C

AP:

12-1

6 FP

S

QC

AP:

37,4

00 C

FSV C

AP:

12-1

6 FP

S

QCAP: 117,400 CFSVCAP: 13-18 FPSQCAP: 117,400 CFSVCAP: 13-18 FPS

NEWHALL RANCH RD.

NEWHALL RANCH RD.AVE. SCOTT

AVE. SCOTT

MCBE

AN P

KWY.

MCBE

AN P

KWY.

SOIL CEMENTBANK PROTECTION

SOIL CEMENTBANK PROTECTION

SOIL CEMENT BANK STABILIZATION PLANSOIL CEMENT BANK STABILIZATION PLAN

NN

Summary of the Advantages of Soil Cement Bank ProtectionSummary of the Advantages of Soil Cement Bank Protection

1. Safety! Improved public access in and out of river bank! Reduced flow depths & velocities at river edge by creating stabilized over bank area

2. Flood Protection & Durability! Soil Cement has proven tract record of providing sound flood protection! Massive homogeneous & monolithic structure

3. Environmental Sensitivity & Resource Conservation! 90% of material available on site, thus conserving resources & reducing the impact

to the environment." Use of offsite natural resources (rip-rap, steel, etc.)" Fuel consumption, vehicular pollution" Traffic congestion

! Reduced impact to the native habitat" Buried bank protection" Revegetation & setback from existing habitat" Soil Cement if exposed provides unobtrusive bank stabilization due to its native

color, texture & finish (appears as hardened native soils)" Reduced construction time & impacts

4. Cost Effective Solution! Savings of 30 to 50% over conventional concrete or rip-rap bank protection methods

CAP FLOOD W.S.

100-YEAR W.S.

PD #2509West Creek (VTTM #52455)

16’ WIDE DRAINAGE EASEMENT FOR PROPOSED PEDESTRIAN

TRAIL AND ACCESS ROAD

PROPOSED SOIL CEMENT BANK PROTECTION

LIMITS OF EXCAVATION FOR SOIL CEMENT

PROPOSED GRADE

DAYLIGHT LINE

20’ CONSTRUCTION

ACCESS

LIMIT OF CONSTRUCTION AND DISTURBANCE. OWNER TO

ERECT TEMPORARY FENCING.

EXISTING GRADE

S.A.

T

SETB

A CK

RESO

URC

E LI

NE

WEST CREEK DEVELOPMENT

1200

1180

1160

300400500

Typical Buried Soil Cement Bank Protection Cross SectionTypical Buried Soil Cement Bank Protection Cross Section

REVEGETATION ZONE

Exposed Soil CementBridgeport – Santa Clarita, CA

Exposed Soil CementBridgeport – Santa Clarita, CA

Compaction, Density, and TestingBridgeport – Santa Clarita, CA

Quality Control TestingIn Field Moisture/Density Test (cone or nuclear density meter)

(ASTM D 1632-87 & 1632-84 to prepare & test cylinders to determine compressive strength)

Quality Control TestingCollection of Soil Cement for Test Cylinder

(ASTM D 1632-87 & 1632-84 to prepare & test cylinders to determine compressive strength)

Quality Control TestingCompaction of Test Cylinder

(ASTM D 1632-87 & 1632-84 to prepare & test cylinders to determine compressive strength)

Quality Control TestingRemoval of Test Cylinder from Mold

(ASTM D 1632-87 & 1632-84 to prepare & test cylinders to determine compressive strength)

Westcreek Soil Cement Compressive Strength Test Data

200

0

400

600

800

1000

1200

1400

1600

414

499

625

334

652

833 812

1113

613

946

1235

1385

1521

1027

221207

376

732

830

Minimum Requirement 750 psi. @ 7-dayMinimum Requirement 750 psi. @ 7-day

(Project Stockpile vs. Final Averages)For Project Stockpile

436

Com

pres

sive

Str

engt

h (p

si)

Days1 3 7

44%

40%

41%69%

67% 59%

73%

6.5 % Cement Content 7.0 % Cement Content 7.5 % Cement Content 8.0 % Cement Content 9.0 % Cement Content

1 Day Strength = ±40% of 7 Day

3 Day Strength = ±70% of 7 Day

Excavation for Soil CementPlacement of Soil CementCompleted Soil Cement with Top ExposedCompletely Backfilled Soil CementRevegetation Complete with Maintenance Road & Trail over Soil Cement

Bridgeport Soil Cement Bank Protection Photo SequenceBridgeport Soil Cement Bank Protection Photo Sequence

BI-LEVEL SOIL CEMENTAn Environmentally Superior Bank Protection System

BI-LEVEL SOIL CEMENTAn Environmentally Superior Bank Protection System