W912PL21B0004_Amendment0002.pdf

(SEE ITEM 13)

SARM Phase II Prado Dam Alcoa Aluminum Plant Dike Phase II W912PL21B0004 Riverside County, CA

SF 30 CONTINUATION PAGE 1 OF 2

27 July 2021 Amendment 0002

SF 30 BLOCK 14 CONTINUATION

SUMMARY OF CHANGES

DIVISION 00 - PROCUREMENT AND CONTRACTING REQUIREMENTS

Section Number Section Title

SF-1442 SOLICITATION OFFER AND AWARD

Solicitation due date has been changed to 6 August 2021

00 01 10 TABLE OF CONTENTS

00 10 00 CONTRACT LINE ITEM (CLIN) SCHEDULE

00 21 13 INSTRUCTION TO BIDDERS

Replace page 5 of 7 in section 00 21 13: Updated bid opening date and added call in number for virtual bid opening

00 70 00 CONDITIONS OF THE CONTRACT

Updated Entire Section 00 70 00 Removed clause 52.228‐5 “Insurance – Work on a Government Installation

(JAN1997)

DIVISION 01 – 48 - TECHNICAL SPECIFICATIONS

Section Number Section Title

31 56 14 SOIL-CEMENT-BENTONITE (SCB) CUTOFF WALL - DEEP MIXING

METHOD

DRAWINGS

Sheet Number

Sheet Title

G-002 INDEX TO CONTRACT DRAWINGS

See index to contract drawings for drawing changes.

SARM Phase II Prado Dam Alcoa Aluminum Plant Dike Phase II

W912PL21B0004

SF-1442 - SOLICITATION AND AWARD Am1Am2

00 01 05 CERTIFICATION PAGE

00 01 10 Am1Am2 00 10 00 Am1Am2 00 21 00 INSTRUCTIONS Am1 00 21 13 INSTRUCTIONS TO BIDDERS Am1Am2

00 45 00 REPRESENTATION AND CERTIFICATIONS

00 70 00 CONDITIONS OF THE CONTRACT Am1Am2 00 73 00 SUPPLEMENTARY CONDITIONS Am1 00 73 46 WAGE RATES Am1

01 11 00 01 22 00 01 32 01 01 33 00 01 35 26 01 42 00 01 45 00 01 45 01 01 50 00

01 57 19

01 57 30 CONSTRUCTION DEWATERING AND CONTROL OF SURFACE WATER

01 74 19 CONSTRUCTION AND WASTE MANAGEMENT AND DISPOSAL

01 78 00

03 30 00 03 30 57

05 12 00 05 50 13 05 50 15 05 59 20

09 96 23 09 97 02 Am1

31 00 00

TEMPORARY ENVIRONMENTAL CONTROLS (RIVERSIDE LEVEES REHABILITATION

PROJECT)

EARTHWORK

DIVISION 09 - FINISHES

GRAFFITI-RESISTANT COATINGS

DIVISION 05 - METALS

STRUCTURAL STEEL

MISCELLANEOUS METAL FABRICATIONS

CIVIL WORKS FABRICATIONS

DIVISION 31 - EARTHWORK

FABRICATION OF HYDRAULIC STEEL STRUCTURES

PAINTING: HYDRAULIC STRUCTURES

TABLE OF CONTENTS

DIVISION 01 - GENERAL REQUIREMENTS

SUMMARY OF WORK

PRICE AND PAYMENT PROCEDURES

PROJECT SCHEDULE

DIVISION 00 - PROCUREMENT AND CONTRACTING REQUIREMENTS

CONTRACT LINE ITEM NUMBER (CLIN) SCHEDULE

TABLE OF CONTENTS

SECTION 00 01 10

RESIDENT MANAGEMENT SYSTEM CONTRACTOR MODE (RMS CM)

SUBMITTAL PROCEDURES

GOVERNMENTAL SAFETY REQUIREMENTS

SOURCES FOR REFERENCE PUBLICATIONS

QUALITY CONTROL

TEMPORARY CONSTRUCTION FACILITIES AND CONTROLS

CLOSEOUT SUBMITTALS

DIVISION 03 - CONCRETE

CAST-IN-PLACE CONCRETE

CONTROLLED LOW-STRENGTH MATERIAL (CLSM)

27 July 2021

TABLE OF CONTENTS PAGE 1

Amendment 0002

W912PL21B0004

31 09 13 31 11 00 31 56 14 SOIL-CEMENT-BENTONITE (SCB) CUTOFF WALL - DEEP MIXING METHOD Am2

32 11 23 32 12 16 32 31 13 32 92 19 32 93 00

33 40 00 33 46 16

35 31 19

-- End of Project Table of Contents --

APPENDIX B - SANTA ANA RIVER TRAIL

DIVISION 32 - EXTERIOR IMPROVEMENTS

AGGREGATE BASE COURSE

SUBDRAINAGE PIPING

DIVISION 35 - STONE PROTECTION

STONE PROTECTION

HOT-MIX ASPHALT (HMA) FOR ROADS

CHAIN LINK FENCES AND GATES

SEEDING

EXTERIOR PLANTING

STORM DRAINAGE UTILITIES

GEOTECHNICAL INSTRUMENTATION AND MONITORING

CLEARING AND GRUBBING

APPENDIX A - UTILITIES AND STREET IMPROVEMENTS

DIVISION 33 - UTILITIES

27 July 2021

TABLE OF CONTENTS PAGE 2

SOLICITATION, OFFER,

AND AWARD

(Construction, Alteration, or Repair)

1. SOLICITATION NUMBER 2. TYPE OF SOLICITATION

SEALED BID (IFB)

NEGOTIATED (RFP)

PAGE OF PAGES

IMPORTANT - The "offer" section on the reverse must be fully completed by the offeror.

4. CONTRACT NUMBER 5. REQUISITION/PURCHASE REQUEST NUMBER 6. PROJECT NUMBER

7. ISSUED BY CODE

9. FOR INFORMATION CALL

B. TELEPHONE NUMBER (Include area code) (NO COLLECT CALLS)

SOLICITATION

NOTE: In sealed bid solicitations "offer" and "offeror" mean "bid" and "bidder".

11. The Contractor shall begin performance within calendar days and complete it within calendar days after receiving award, notice to proceed. This performance period is mandatory, negotiable. (See .)

12A. THE CONTRACTOR MUST FURNISH ANY REQUIRED PERFORMANCE PAYMENT BONDS?

(If "YES," indicate within how many calendar days after award in Item 12B.)

12B. CALENDAR DAYS

YES NO

13. ADDITIONAL SOLICITATION REQUIREMENTS:

A. Sealed offers in original and copies to perform the work required are due at the place specified in Item 8 by (hour)

B. An offer guarantee is, is not required.

C. All offers are subject to the (1) work requirements, and (2) other provisions and clauses incorporated in the solicitation in full text or by reference.

D. Offers providing less than calendar days for Government acceptance after the date offers are due will not be considered and will be rejected.

NSN 7540-01-155-3212

Designed using Perform Pro, WHS/DIOR, Oct 96

1442-103 STANDARD FORM 1442 (REV. 4-85) (EG)

Prescribed by GSA - FAR (48 CFR) 53.236-1(d)

W912PL21B0004 x

3. DATE ISSUED

1 OF

U.S.Army Corps of Engineers, Los Angeles Dist Attn:Contracting Division CESPL-CT-W 915 Wilshire Boulevard, Suite 930 Los Angeles, California 90017-3401

A. NAME

Michael G Robinson 213-452-3311

10 see 00 73 00

X X *Section 00 73 00

X 10

1 Digital 1:00 PM

5 August 2021 If this is a sealed bid solicitation, offers will be publicly opened at that time. Sealed envelopes containing offers shall be marked to show the offeror’s name and address, the solicitation number, and the date and time offers are due.

X

8. ADDRESS OFFER TO

Bids are to be submitted electronically, DoD Secure Access File Exchange (DoD Safe) at https://safe.apps.mil/ in accordance with Section 00 21 13, Instructions Pertaining to Submission of Electronic Bids (APR 2020).

10. THE GOVERNMENT REQUIRES PERFORMANCE OF THE WORK DESCRIBED IN THESE DOCUMENTS (Title, identifying number, date):

Alcoa Dike Phase 2, Corona, Riverside County, CA

The project is approximately 3,000 linear feet earthen filled dike flood control structure. The elevation of the top of the dike varies between elevations 569.50 and 573.50. The dike will have the following basic characteristics: average height of 22 feet above existing ground, width of crest is 15 feet, 2.25 horizontal to 1 vertical (2.25H:1V) side slopes, upstream slope will be protected with 15-inch layer of riprap over a 12-inch layer of bedding, downstream slope will be hydroseeded. Butterfield Drive, W. Rincon Street, and Auburndale Street will be impacted by the construction of the dike. A concrete floodwall and floodgate will be constructed across Auburndale Street. Butterfield Drive will be modified and a new connector road constructed to connect to Rincon Street.

Total Period of Performance is 1095 Calendar Days. Completion of Bid Item’s 0001 through 0032, 0034, and 0036 through 0038 will be within the first 730 Calendar Days. Completion of Bid Item 0033 and 0035 Landscape Establishment and 0034 Borrow Area Closure will be 365 Calendar Days and be completed prior to the end of the Total Period of Performance period.”

The Estimate cost range for this procurement is $10,000,000 - $25,000,000

This procurement is a 100% total Small Business Set Aside. The NAICS Code is 237990 "Other Heavy and Civil Engineering Construction. The size Standard is $39,500,000.00.

Be advised this project may delayed, postponed, canceled or revised at any time prior to award.

OFFER (Must be fully completed by offeror)

STANDARD FORM 1442 BACK (REV. 4-85)

14. NAME AND ADDRESS OF OFFEROR (Include ZIP Code) 15. TELEPHONE NUMBER (Include area code)

16. REMITTANCE ADDRESS (Include only if different than Item 14)

CODE FACILITY CODE

17. The offeror agrees to perform the work required at the prices specified below in strict accordance with the terms of this solicitation, if this offer is accepted by the Government in writing within calendar days after the date offers are due. (Insert any number equal or greater than the minimum requirement stated in 13D. Failure to insert any number means the offeror accepts the minimum in Item 13D.)

AMOUNTS

18. The offeror agrees to furnish any required performance and payment bonds.

19. ACKNOWLEDGEMENT OF AMENDMENTS

(The offeror acknowledges receipt of amendments to the solicitation - give number and date of each)

AMENDMENT NO.

DATE

20A. NAME AND TITLE OF PERSON AUTHORIZED TO SIGN OFFER (Type or print) 20B. SIGNATURE 20C. OFFER DATE

AWARD (To be completed by Government)

21. ITEMS ACCEPTED

22. AMOUNT 23. ACCOUNTING AND APPROPRIATION DATA

24.SUBMIT INVOICES TO ADDRESS SHOWN IN

(4 copies unless otherwise specified)

ITEM 25. OTHER THAN FULL AND OPEN COMPETITION PURSUANT TO

10 U.S.C. 2304(c) ( ) 41 U.S.C. 253(c) ( )

26. ADMINISTERED BY 27. PAYMENT WILL BE MADE BYCODE

CONTRACTING OFFICER WILL COMPLETE ITEM 28 OR 29 AS APPLICABLE

28. NEGOTIATED AGREEMENT (Contractor is required to sign this document and return copies to the issuing office.) Contractor agrees to furnish and deliver all items or perform all work requirements identified on this form and any continuation sheets for the consideration stated in this contract. The rights and obligations of the parties to this contract shall be governed by (a) this contract award, (b) the solicitation, and

(c) the clauses, representations, certifications, and specifications incorporated by reference in or attached to this contract.

29. AWARD. (Contractor is not required to sign this document.) Your offer on this solicitation is hereby accepted as to the items listed. This award consummates the contract, which consists of (a) the Government solicitation and your offer, and (b) this contract award. No further contractual document is necessary.

30A. NAME AND TITLE OF CONTRACTOR OR PERSON AUTHORIZED TO SIGN

(Type or print)

30B. SIGNATURE 30C. DATE

31A. NAME OF CONTRACTING OFFICER (Type or print)

31B. UNITED STATES OF AMERICA 31C. AWARD DATE

BY

DUNS NO.: TAX ID NO.:

CAGE CODE NO.:

( ) - ; FAX ( ) -

See Section 00 10 00 Solicitation Contract Line Item Number (CLIN) Schedule

Santa Ana Dams Resident Office 2493 Pomona Riccon Rd.

Corona, CA 92880

USACE, Finance Center

ATTN: CEFCO-AO-D

5722 Integrity Drive Millington, TN 38054-5005

W912PL21B0004

Item Description Quantity Unit Unit Price

Amount

0001 Construction Dewatering of Groundwater 1 Job JA -$

0002 Treatment of Dewatering Effluent 1 Job JA -$

0003 Control of Surface Water 1 Job JA -$

0004 Well Abandonment 2 EA $ -$

0005 Clear Site and Remove Obstructions 16 AC $ -$

0006 Stripping 25,000 CY $ -$

0007 Excavation 126,000 CY $ -$

0008 Overexcavation

0008AA First 4,000 CY 4,000 CY $ -$

0008BB Over 4,000 CY 4,000 CY $ -$

0009 General Fill 10,300 CY $ -$

0010 Zone I Material 306,600 CY $ -$

0011 Select Zone I Material 7,000 TON $ -$

0012 Zone II Material 79,000 CY $ -$

0013 15 Inch Riprap 19,800 TON $ -$

0014 Bedding 17,400 TON $ -$

CONTRACTOR MUST FURNISH ALL PLANT, LABOR, MATERIAL,

EQUIPMENT, ETC. NECESSARY TO PERFORM ALL WORK IN STRICT

ACCORDANCE WITH THE TERMS AND CONDITIONS SET FORTH IN THE

CONTRACT TO INCLUDE ALL ATTACHMENTS THERETO.

SECTION 00 10 00

Solicitation Contract Line Item (CLIN) Schedule

Bidding Schedule

27 July 2021 SECTION 00 10 00 Page 1

W912PL21B0004

Item Description Quantity Unit Unit Price

Amount

0015 Aggregate Base Course 5,700 TON $ -$

0016 Floodgate 1 Job JA -$

0017 Floodwall 130 LF $ -$

0018 Culvert 1 - Station 91+44.45 1 Job JA -$

0019 Culvert 2 - Station 119+60 1 Job JA -$

0020 AC Paving 130 TON $ -$

0021 4 Foot Wide Concrete Swale 710 LF $ -$

0022 10 Foot Wide Concrete Swale 380 LF $ -$

0023 Test Trench 6 EA $ -$

0024 Settlement Monuments 25 EA $ -$

0025 Settlement Bases 2 EA $ -$

0026 Geotechnical Instrumentation 1 Job JA -$

0027 Soil-Cement-Bentonite (SCB) Cutoff Wall

8,600 SF $ -$

0028 CIP Wall Section 1 Job JA -$

0029 Sound Wall 10,000 LF $ -$

0030 Swing Gate 1 Job JA -$

0031 Landscape Planting and Hydroseeding 97 AC $ -$

0032 Temporary Irrigation 97 AC $ -$

0033 Landscape Establishment 97 AC $ -$

0034 City of Corona 12 Inch Domestic Water Steel Casing Annular Space Fill 1 Job JA -$

0035 Borrow Area Closure 1 Job JA -$

27 July 2021 SECTION 00 10 00 Page 2

W912PL21B0004

Item Description Quantity Unit Unit Price

Amount

0036 City of Corona Street Improvements 1 Job JA -$

0037 City of Corona Sewer and Force Main Relocation and Protection 1 Job JA -$

0038 Santa Ana River Trail - Phase 4 1 Job JA -$

-$ TOTAL AMOUNT:

(Line Items 0001 through 0038)

27 July 2021 SECTION 00 10 00 Page 3

Alcoa Aluminum Plant Dike Phase II W912PL21B0004

RECEIPT OF SUBMISSIONS:

For the purposes of establishing whether a bid submission is considered timely, the government considers the date and time the submission is completely uploaded into the SAFE website. For bids larger than the 8GB capacity of the SAFE website and require multiple submissions, the Government will consider the date and time the last submission is completely uploaded into the SAFE website. Do not assume that electronic communication is instantaneous. It can take several minutes or even hours in some cases.

The government will not be responsible for submissions delivered to any location or to anyone other than those designated to receive bids. Bidders are responsible for ensuring that bids are submitted so as to reach the designated recipient. Bidders are responsible for allowing sufficient time for the bid to be received in accordance with the instructions provided.

(End of statement)

VIRTUAL BID OPENING PROCEDURES AND INSTRUCTIONS FOR BIDDER’S PARTICIPATON

The electronic bids for this project are due on 5 August 2021 at 1:00 PM Local time.

In order to allow the bid opening officer sufficient time to download the bids after bids are due, the virtual bid opening will be held at 2:15 PM local time on 5 August 2021.

At the bid opening teleconference, bids and the Independent Government Estimate will be read aloud, just as in a traditional bid opening.

Following the bid opening a copy of the bid abstract and any bid can be made available for public inspection by interested persons by emailing a copy of the abstract and requested bids to those who participated in the virtual bid opening. In addition, in accordance with established practices, the Abstract of Bids will be available at sam.gov for all interested parties.

To participate in the Virtual Bid Opening, the following information is provided:

1-844-800-2712 US Toll Free Access code: 199 827 1077

(End of statement)

CONTRACTOR RESPONSIBILITY, PRE-AWARD SURVEY INFORMATION TO BE SUBMITTED

WITH BID

Amendment 0002 - Section 00 21 13

Alcoa Aluminum Plant Dike Phase II W912PL21B0004

52.228-2 ADDITIONAL BOND SECURITY (OCT 1997)

The Contractor shall promptly furnish additional security required to protect the Government and persons supplying labor or materials under this contract if--

(a) Any surety upon any bond, or issuing financial institution for other security, furnished with this contract becomes unacceptable to the Government.

(b) Any surety fails to furnish reports on its financial condition as required by the Government;

(c) The contract price is increased so that the penal sum of any bond becomes inadequate in the opinion of the Contracting Officer; or

(d) An irrevocable letter of credit (ILC) used as security will expire before the end of the period of required security.

If the Contractor does not furnish an acceptable extension or replacement ILC, or other acceptable substitute, at least 30 days before an ILC's scheduled expiration, the Contracting officer has the right to immediately draw on the ILC.

(End of clause)

52.228-5 INSURANCE--WORK ON A GOVERNMENT INSTALLATION (JAN 1997)

(a) The Contractor shall, at its own expense, provide and maintain during the entire performance of this contract, at least the kinds and minimum amounts of insurance required in the Schedule or elsewhere in the contract.

(b) Before commencing work under this contract, the Contractor shall notify the Contracting Officer in writing that the required insurance has been obtained. The policies evidencing required insurance shall contain an endorsement to the effect that any cancellation or any material change adversely affecting the Government's interest shall not be effective (1) for such period as the laws of the State in which this contract is to be performed prescribe, or (2) until 30 days after the insurer or the Contractor gives written notice to the Contracting Officer, whichever period is longer.

(c) The Contractor shall insert the substance of this clause, including this paragraph (c), in subcontracts under this contract that require work on a Government installation and shall require subcontractors to provide and maintain the insurance required in the Schedule or elsewhere in the contract. The Contractor shall maintain a copy of all subcontractors' proofs of required insurance, and shall make copies available to the Contracting Officer upon request.

(End of clause)

52.228-11 INDIVIDUAL SURETY—PLEDGE OF ASSETS (FEB 2021) (DEVIATION 2020-O0016)

(a) Offerors shall obtain from each person acting as an individual surety on a bid guarantee, a performance bond, or a payment bond –

(1) Pledge of assets; and

Section 00 70 00 Amendment 0002 - Page 108 of 195

SECTION TABLE OF CONTENTS

DIVISION 31 - EARTHWORK

SECTION 31 56 14

SOIL-CEMENT-BENTONITE (SCB) CUTOFF WALL - DEEP MIXING METHOD

PART 1 GENERAL

1.1 SUMMARY

1.2 REFERENCES

1.3 GENERAL CONDITIONS

1.3.1 Lines and Grades

1.3.2 Conduct of Work

1.3.3 Access and Ramps

1.3.4 Protection of Existing Facilities

1.3.5 Permits

1.3.6 Construction Method

1.3.7 Sequencing of the Work

1.3.8 Water for Construction

1.4 DEFINITIONS

1.4.1 SCB Cutoff Wall

1.4.2 Bentonite

1.4.3 Portland Cement

1.4.4 Ground Water Level

1.4.5 Working Surface

1.4.6 Admixtures

1.4.7 SCB Cutoff Wall Specialist

1.4.8 SCB Cutoff Wall Equipment Operator

1.4.9 Quality Control Laboratory

1.4.10 Quality Control Report

1.4.11 Obstructions

1.4.12 Excavation Refusal

1.4.13 Remediation Plan

1.4.14 Elevation Datum

1.4.15 Material Safety Data Sheet (MSDS)

1.5 RELATED SECTIONS

1.6 SUBMITTALS

1.7 QUALITY CONTROL

1.7.1 Coordination of Laboratories

1.7.2 Rejected Work

1.8 QUALIFICATIONS

1.8.1 Contractor

1.8.2 Soil Mixing Equipment Operator

1.8.3 Soil Mixed Grout Plant Operator

1.8.4 Soil-Mixed Cutoff Wall Specialist

1.8.5 Quality Control Laboratory

1.9 DELIVERY, STORAGE, AND HANDLING

1.10 GEOTECHNICAL SITE CONDITIONS

1.10.1 Exploration

1.10.2 Ground Water

1.10.3 Knowledge of Subsurface Data

1.11 MAINTENANCE

1.11.1 Extra Materials

SECTION 31 56 14 Page 1 27 July 2021 Amendment 0002

PART 2 PRODUCTS

2.1 GENERAL

2.2 MATERIAL STORAGE FACILITY

2.3 PORTLAND CEMENT

2.4 BENTONITE

2.5 ADMIXTURES

2.6 WATER

2.6.1 Source

2.6.2 Water Quality

2.7 SOIL-CEMENT-BENTONITE MIXTURE

2.8 MATERIAL STORAGE FACILITY

2.9 ENVIRONMENTAL PROTECTION

2.10 DISPOSAL SITE

2.11 EQUIPMENT

2.11.1 DMM Drilling Equipment

2.11.2 DMM Mixing Equipment

2.11.3 Field Laboratory Equipment

2.11.4 Hauling Equipment

2.11.5 Equipment Weight, Speed, and Width

2.12 CONSTRUCTION STAKING

2.12.1 Initial and Final Elevation

2.13 PERMANENT METAL MARKER STAKES

PART 3 EXECUTION

3.1 GENERAL

3.1.1 SCB Cutoff Wall and DMM Implementation Plan

3.1.1.1 Soil Mixing Equipment

3.1.1.2 Binder Delivery Methods and Equipment

3.1.1.3 Qualification Submittal

3.1.1.4 Sample Quality Control Records

3.1.1.5 Schedule and Sequence of Operations

3.1.1.6 Sequence of Operations at Utility Line Crossings

3.1.1.7 Sampling Plan

3.1.1.8 SCB Cutoff Wall Surcharge Loading Plan

3.1.2 Design Requirements

3.1.3 Acceptance Requirements

3.1.4 Demonstration Section

3.1.4.1 Location

3.1.4.2 Mix Design Development - Bench Testing

3.1.4.3 Establishment of Mixing Index

3.1.4.4 Core Drilling and Virtual Cores

3.1.4.5 Special Quality Control Testing

3.2 MOBILIZATION

3.3 SITE WORK

3.3.1 Working Surface

3.3.2 Rig Assembly

3.3.3 Grout Plant Assembly

3.3.4 Rig Movement to Work Area

3.4 MATERIAL DELIVERY AND INJECTION

3.4.1 Deliveries

3.4.2 Silo Loading

3.4.3 Batching, Mixing and Agitation

3.4.4 Pumping

3.4.5 Air Injection

3.4.6 Injection

3.4.6.1 Leads

3.4.6.2 Ports

SECTION 31 56 14 Page 2

3.5 EQUIPMENT

3.5.1 Soil Mixing Apparatus

3.5.2 Electronic Sensors

3.5.3 Penetration Depth Marking

3.5.4 Cement/Bentonite Slurry Plant

3.5.5 Replacement Parts

3.6 INSTALLATION

3.6.1 Heading Construction

3.6.1.1 Element Sequencing

3.6.1.2 Element to Element Connections

3.6.1.3 Production Breaks

3.6.1.4 Heading Connections

3.6.2 Element Construction

3.6.2.1 Construction Staking

3.6.2.2 Rig Positioning

3.6.2.3 Material Mixing

3.6.2.4 Mixing Technique

3.6.2.5 Construction Progress

3.6.2.6 Grout Injection Rate

3.6.2.7 Cement Bentonite Slurry Injection Rate Modification

3.6.2.8 Mixing Index Modifications

3.6.3 Depth Modifications

3.7 DEMOBILIZATION

3.7.1 Cleanup

3.7.2 Disposal or Waste Materials

3.7.3 Survey Monuments

3.8 FIELD QUALITY CONTROL

3.8.1 Materials Testing

3.8.1.1 Sample Collection and Testing

3.8.1.2 Grout Testing

3.8.1.3 Wet Bulk Sampling

3.8.1.4 Hydraulic Conductivity Testing

3.8.1.5 Compressive Strength Testing

3.8.1.6 Laboratory Testing

3.8.1.7 Coordination of Testing Laboratories

3.8.2 Rig Instrumentation and Telemetry

3.8.2.1 Installation Records

3.8.2.2 Mixing Technique

3.8.2.3 Wall Continuity

3.8.2.4 Soil Mixing Apparatus Rotation Speed and Penetration and

Withdrawal Rates

3.8.2.5 Cement Bentonite Slurry Injection Rate

3.8.2.6 Modifications to Injection Rate

3.8.2.7 Continuous real time monitoring and recording of the

following soil mixing parameters.

3.8.3 Reporting

3.8.3.1 Materials Testing

3.8.3.2 Daily Reports

3.9 PROTECTION OF SCB CUTOFF WALL

3.10 TEMPORARY CAP

3.11 REMOVAL OF TEMPORARY CAP

3.12 REJECTED SCB CUTOFF WALL SECTIONS

3.13 QUALITY ASSURANCE INSPECTION ANDS TESTING

3.14 SCB CUTOFF WALL CLOSE OUT AND ACCEPTANCE

3.14.1 Construction Records

3.14.2 Construction Documentation

3.14.3 Construction Quality Control Test Results

3.14.4 Construction Log

3.14.5 As-Built Drawing

SECTION 31 56 14 Page 3

3.14.6 Acceptance

3.14.7 Acceptance Criteria

-- End of Section Table of Contents --

SECTION 31 56 14 Page 4

SECTION 31 56 14

SOIL-CEMENT-BENTONITE (SCB) CUTOFF WALL - DEEP MIXING METHOD

PART 1 GENERAL

1.1 SUMMARY

The work covered by this section consists of furnishing all plant, labor, equipment, and materials and of performing all operations in connection with the construction of a seepage soi l - cement - bent oni t e ( SCB) cutoff wall, in accordance with these specifications and the applicable Drawings.

The SCB cut of f wal l const r uct i on addr essed i n t hi s speci f i cat i on i s t he Deep Mi xi ng Met hod ( DMM) . The intent of the SCB cutoff wall is to provide a continuous, homogenous, low permeability barrier to embankment and foundation seepage within the vertical depth limits and horizontal station limits shown on the Drawings. The SCB cut of f wal l must be const r uct ed f r om t he wor ki ng sur f ace i dent i f i ed on t he Dr awi ngs .

The Contractor must construct the SCB cutoff wall sections shown on the Drawings by the DMM method in accordance with this section.

1.2 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN PETROLEUM INSTITUTE (API)

API RP 13B-1 (2009; R 2016) Recommended Practice for Field Testing Water-Based Drilling Fluids

API Spec 13A (2010; Errata 1 2014; Errata 2-3 2015) Specification for Drilling-Fluid Materials

ASTM INTERNATIONAL (ASTM)

ASTM C150/C150M (2020) Standard Specification for Portland Cement

ASTM D2166 (2016) Standard Test Method for Unconfined Compressive Strength of Cohesive Soil

ASTM D4380 (2012) Standard Test Method for Density of Bentonitic Slurries

ASTM D4832 (2016; E 2018) Standard Test Method for Preparation and Testing of Controlled Low Strength Material (CLSM) Test Cylinders

ASTM D5084 (2016a) Standard Test Methods for Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a Flexible Wall Permeameter

SECTION 31 56 14 Page 5

U.S. FEDERAL HIGHWAY ADMINISTRATION (FHWA)

FHWA-HRT-13-046 (2013) Federal Highway Administration Manual Deep Mixing For Embankment and Foundation Support

U.S. ENVIRONMENTAL PROTECTION AGENCY (EPA)

EPA 600/4-90/027F (1993) Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms

STATE OF CALIFORNIA DEPARTMENT OF TRANSPORTATION (CALTRANS)

CA MUTCD (2014, Rev 6) California Manual on Uniform Traffic Control Devices

1.3 GENERAL CONDITIONS

1.3.1 Lines and Grades

The Contracting Officer may at any time prior to or during construction require a change in the SCB cutoff wall depth. The objective of the SCB cutoff wall is to block potential seepage through the dike embankment and/or through the dike foundation materials . The SCB cutoff wall may be optimized by increasing or decreasing the depth of the SCB cutoff wall.

The potential variation from the depth indicated in the Drawings is estimated to be plus or minus 5 feet , but Contractor's equipment must be capable of constructing a SCB cutoff wall 10 feet deeper than the maximum depth indicated on the Drawings.

1.3.2 Conduct of Work

Maintain and protect the SCB cutoff wall in a satisfactory condition at all times until final completion and acceptance of all work under the Contract.

1.3.3 Access and Ramps

See Section 01 50 00 TEMPORARY CONSTRUCTION FACILITIES AND CONTROLS and Section 31 00 00 EARTHWORK for details and requirements for access and ramps.

1.3.4 Protection of Existing Facilities

Construction must be conducted in a manner that avoids damage to all existing facilities that are not designated for removal or reconstruction.

1.3.5 Permits

The Contractor and subcontractors must obtain and pay all necessary fees for all local, state, and federal permits required of the Contractor and subcontractors to accomplish the Work.

1.3.6 Construction Method

The SCB cutoff wall must be constructed using t he DMM in situ multi-shaft soil mixing methods capable of meeting the requirements of this section and classified as either: Wet Rotary Shaft (WRS), Wet Rotary End (WRE), or

SECTION 31 56 14 Page 6

Wet Vertical Panel (WVP), as described in the FHWA-HRT-13-046 . Methods that do not use mechanical soil cutting or mixing methods are not acceptable. The SCB cutoff wall must be constructed in accordance with these specifications and as shown on the Drawings. The design intent is to produce an incompressible, relatively low-strength, low-permeability, continuous SCB cutoff wall. The SCB cutoff wall must be continuous between the starting and ending points for each alignment, with an appropriate overlap between elements and headings to ensure continuity to full depth. The SCB cutoff wall must consist of either a series of overlapping SCB elements, formed underground through and beneath the dike, or by a full-depth horizontal advancement. Individual elements are joined utilizing overlaps, forming a continuous soil-mixed SCB cutoff wall along the entire alignment.

1.3.7 Sequencing of the Work

The Contractor may use multiple headings to achieve the required schedule completion dates. The Contractor must consult the Section 00 73 00 SUPPLEMENTARY CONDITIONS for any information regarding using multiple work shifts per day to achieve the required schedule completion dates.

1.3.8 Water for Construction

Details regarding water supplies, and the pumping and conveyance of the water, are presented in Section 01 57 30 , CONSTRUCTION DEWATERING AND CONTROL OF SURFACE WATER. This water source will be used for all trial mixes and production.

1.4 DEFINITIONS

1.4.1 SCB Cutoff Wall

The SCB cutoff wall is to be a minimum 27-inch -wide wall installed from the prepared working surface using the DMM method to form a continuous low permeability barrier with a specified maximum permeability and within a specified range of unconfined compressive strength.

1.4.2 Bentonite

Bentonite is an ultrafine natural clay whose principal mineral constituent is sodium cation montmorillonite.

1.4.3 Portland Cement

Cement t o be used i n const r uct i ng t he SCB cut of f wal l must be Por t l and Cement Type I I - V per ASTM C150/ C150M. Use of reclaimed cement or cement containing lumps or deleterious matter must not be allowed.

1.4.4 Ground Water Level

The ground water level is the piezometric level of the ground water as shown on the exploration logs in the Geotechnical Data Report.

Groundwater levels indicated on the exploration logs were levels found at the time of exploration. The groundwater table can vary significantly depending on time of year and variation from normal precipitation.

1.4.5 Working Surface

The working surface is the area along the dike embankment , prepared as

SECTION 31 56 14 Page 7 shown on the Drawings and described in the Specifications, from which the SCB cutoff wall must be constructed.

1.4.6 Admixtures

Any approved additive used to modify the properties of the soil-cement-bentonite mix.

1.4.7 SCB Cutoff Wall Specialist

The SCB cut of f wal l speci al i st i s an i ndi v i dual wor ki ng f or t he Cont r act or who wi l l have r esponsi bi l i t y f or t he const r uct i on of t he SCB cut of f wal l .

1.4.8 SCB Cutoff Wall Equipment Operator

The excavat i on equi pment oper at or i s an i ndi v i dual who wi l l oper at e t he excavat i on equi pment used t o const r uct t he SCB cut of f wal l .

1.4.9 Quality Control Laboratory

Contractor's quality control laboratory must perform quality control testing on material samples to verify compliance with the Specifications.

1.4.10 Quality Control Report

A report prepared by the Contractor for each shift and for each rig (if multiple headings of the SCB cutoff wall are advanced) that documents the progress on the DMM and SCB cutoff wall construction and present the results of the quality control inspection and testing.

1.4.11 Obstructions

Culverts, standpipes, and other buried piping that are shown on the Drawings and that are either to be preserved and protected or removed and replaced as part of the work must not be considered obstructions. Existing utilities shown on the drawings must not be considered obstructions.

Man-made objects encountered within the zone excavated to degrade the dike (e.g., utilities and other facilities, etc.) must not be considered obstructions. The Contracting Officer must be the sole judge of whether an obstruction has been encountered. An obstruction will not be considered unless it is materially different from the subsurface conditions described in the site information provided and when using properly operated and maintained equipment. Past performance will be considered when determining whether the equipment is properly operated and maintained, including but not limited to specific rig performance, tooling, and soil conditions, etc.

1.4.12 Excavation Refusal

The rate of cutting head advancement must be less than:

a. 1 foot vertical advancement in 30 minutes for vertically installed elements, or

b. 0.5 foot horizontal advancement in 30 minutes for horizontally installed elements.

SECTION 31 56 14 Page 8

1.4.13 Remediation Plan

A plan that describes the steps to be taken by the Contractor to bring any section back into compliance with the specifications.

1.4.14 Elevation Datum

All elevations are referenced to the National Geodetic Vertical Datum of 1929 (NGVD-29) in feet.

1.4.15 Material Safety Data Sheet (MSDS)

A detailed informational document prepared by the manufacturer or importer of a hazardous chemical that describes the physical and chemical properties of the product.

1.5 RELATED SECTIONS

Section 01 33 00 SUBMITTAL PROCEDURES

Section 01 45 00 QUALITY CONTROL

Section 01 50 00 TEMPORARY CONSTRUCTION FACILITIES AND CONTROLS

Section 01 57 30 CONSTRUCTION DEWATERING AND CONTROL OF SURFACE WATER

Section 31 00 00 EARTHWORK

1.6 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only or as otherwise designated. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. The following must be submitted in accordance with Section

01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

All Preconstruction Submittals must be submitted no later than 30 calendar days after Notice-to-Proceed.

SCB Cut of f Wal l and DMM I mpl ement at i on Pl an; G, DO

Qualification Submittal ; G, DO

Sample Quality Control Records ; G, DO

Schedule and Sequence of Operations ; G, DO

Sequence of Operations At Utility Line Crossings ; G, DO

Sampling Plan ; G, DO

SCB Cut of f Wal l Pr oduct i on Pl an; G, DO

SCB Cut of f Wal l Sur char ge Loadi ng Pl an; G, DO

Soil Mixing Operation Plan ; G, DO

SECTION 31 56 14 Page 9

Description of the Equipment And Procedures

Remediation Plan ; G, DO

Water Quality Test Results ; G, DO

Results of a Laboratory and Demonstration Section ; G, DO

SD-03 Product Data

Admixtures ; G, RO

SD-04 Samples

Wet Bulk Samples

Chain of Custody Form for Quality Assurance Samples

Trial Mix Designs ; G, DO

SD-05 Design Data

SCB Cut of f Wal l SCB Mat er i al Mi x Desi gn; G, DO

Proposed Mix Design And Construction Methods ; G, DO

SD-06 Test Reports

Calibration Results

SCB Mix Design Test Report ; G, DO

As- Bui l t Pr of i l e of SCB Cut of f Wal l and End of Const r uct i on Summar y Repor t ; G, DO

Daily Field Quality Control Reports

Material Mix Design And Mix Test Report ; G

Laboratory Testing Reports ; G, DO

Construction Quality Control Test Results ; G, DO

SD-07 Certificates

Cement Certification

Bentonite Certification

Admixture Certification

Calibration of Scales and Flow Meters ; G

SD-11 Closeout Submittals

Construction Documentation ; G, DO

Construction Records ; G, DO

SECTION 31 56 14 Page 10

Construction Log ; G, DO

As-Built Drawing ; G, DO

1.7 QUALITY CONTROL

1.7.1 Coordination of Laboratories

The CQC laboratory representative must meet weekly with the Government's quality assurance laboratory representative to coordinate all aspects of their work to eliminate differences in sampling, handling, transporting, storing and testing methods. If discrepancies in the test results from the two labs are noted, the Chief of the Quality Control Laboratory and the Chief of the quality assurance Laboratory must visit and inspect each other's laboratory facilities for the purpose of resolving differences and discrepancies. The Chief of the Quality Control Laboratory must report the findings to the Contracting Officer.

1.7.2 Rejected Work

Rejected work will be repaired by construction of a new heading between the last two locations of acceptable tests. The new heading will be constructed immediately adjacent to the existing SCB cutoff wall on the waterside.

1.8 QUALIFICATIONS

1.8.1 Contractor

Qualifying experience in soil-mixed cutoff wall construction projects in within the last 10 years from this solicitation (year issued). Multiple headings on any one contract is considered as one construction project.

The project experience must have been performed by the entity that performs the work as defined below. An individual's experience from former companies does not qualify as soil-mixed cutoff wall construction project experience for the Contractor. The qual i f y i ng exper i ence i n cut of f wal l const r uct i on pr oj ect s must consi st of t he f ol l owi ng:

Sat i sf act or i l y compl et ed t he const r uct i on of at l east t wo SCB cut of f wal l s usi ng t he i n pl ace soi l mi xi ng met hod. The SCB cutoff wall must have had a minimum depth of 33 feet and a minimum width of 24 inches . The cutoff wall properties must include a maximum permeability of 1 x 10 -6 cm/sec. The qualifications and experience of personnel who are responsible for conducting the operations must include references of the previously completed project owners with owner name; t el ephone number ; addr ess; and pr oj ect descr i pt i on i ncl udi ng dept h, l engt h, and const r uct i on met hod of t he Cont r act or ' s pr evi ous successf ul SCB cut of f wal l const r uct i on and DMM projects . The in situ soil mixing cutoff wall methods must be as classified as either: Wet Rotary Shaft (WRS), Wet Rotary End (WRE), or Wet Rotary and Jet End (WJE), as described in the Federal Highway Administration manual Deep Mixing For Embankment and Foundation Support.

Methods that do not use mechanical soil cutting or mixing methods are not acceptable.

1.8.2 Soil Mixing Equipment Operator

The Soil Mixing Equipment Operator(s) must have experience in using similar equipment to be used for this solicitation in a minimum of two successfully completed projects and a minimum of five years of experience

SECTION 31 56 14 Page 11 similar to the projects described in paragraph Contractor above. The projects listed in the resume must be similar to this solicitation including, but not limited: comparable scope, complexity and physical size completed.

1.8.3 Soil Mixed Grout Plant Operator

The Grout Plant Operator(s) must have experience in using similar grout plant equipment to be used for this solicitation in a minimum of two successfully completed projects and a minimum of five years of experience similar to the projects described in paragraph Contractor above. The projects listed in the resume must be similar to this solicitation including, but not limited: comparable scope, complexity and physical size completed.

1.8.4 Soil-Mixed Cutoff Wall Specialist

The Soil-Mixed Cutoff Wall Specialist(s) must be experienced in providing supervision of mix design and field control composition and mixing of the soil-cement bentonite using in situ soil mixing equipment. The projects listed in the resume must include a minimum of two successfully completed projects and a minimum of five years of experience on projects similar in scope, project type, physical size and complexity to this solicitation and meeting the project criteria in paragraph Contractor above. The experience must include but not limited to: (1) controlling composition, mixing, placing, sampling, testing and maintaining cement bentonite slurry; (2) supervision of alignment, verticality, and depth of soil mixing equipment; (3) controlling blending, mixing, sampling, and testing in-situ material; and (4) a thorough knowledge of soil mixing and cutoff wall construction equipment and material testing.

1.8.5 Quality Control Laboratory

The Contractor's Quality Control Laboratory must be an independent commercial laboratory and must comply with the requirements of Section 01 45 00 QUALITY CONTROL and be a USACE accredited laboratory. Submit Quality Control Laboratory Qualifications for approval.

1.9 DELIVERY, STORAGE, AND HANDLING

Protect materials delivered and placed in storage, protected from the weather, soil, dust or other contaminants.

1.10 GEOTECHNICAL SITE CONDITIONS

1.10.1 Exploration

Subsurface cone penetrometer test probes and exploratory borings have been performed by the Government to evaluate subsurface conditions.

Approximate locations of the explorations, boring and CPT log descriptions, dike embankment and subsurface materials encountered during explorations are included in the specifications. The Government assumes no responsibility for interpretations made by the Contractor from the explorations. Local variations in the subsurface materials are to be expected and, if encountered, will not be considered as being materially different within the purview of this contract. Construction verification exploration of SCB cutoff wall depth requirements is addressed in paragraph DETERMINATION OF KEY-IN LAYER DEPTH.

SECTION 31 56 14 Page 12

1.10.2 Ground Water

Ground water elevations encountered during exploration are show on the boring logs.

1.10.3 Knowledge of Subsurface Data

It is the Contractor's responsibility to become acquainted and satisfied as to the character, quality, and quantity of surface and subsurface materials by inspecting the site, performing additional investigation as necessary for soil classification and mix design formulation and by evaluating information derived from the exploration work performed for this project and included in these plans and specifications. Any failure by the Contractor to become acquainted with all the available information and any other site specific conditions such as utilities will not relieve the Contractor from responsibility for properly estimating the difficulty or cost of successfully performing the work.

1.11 MAINTENANCE

1.11.1 Extra Materials

Maintain at the job site a sufficient quantity of raw materials and other supplies such that the work can proceed uninterrupted by material shortages. Modify the mix proportions and methods as needed to meet the required wall strength, permeability, continuity, and homogeneity and difficult subsurface conditions. Perform additional tests necessary to verify compliance with the Acceptance criteria.

PART 2 PRODUCTS

2.1 GENERAL

The Contractor must maintain at the job site a sufficient quantity of raw materials and other supplies such that the work can proceed uninterrupted by material shortages. The Cont r act or must , i f necessar y, modi f y t he SCB cut of f wal l desi gn mi xes t o meet t he r equi r ement s f or per meabi l i t y , strength, continuity, and homogeneity specified in this Specification section. The Contractor must undertake any additional tests necessary to assist in material selection, to verify compliance with the Specifications, and to demonstrate the characteristics of the SCB cutoff wall.

2.2 MATERIAL STORAGE FACILITY

The Contractor must provide all necessary materials, equipment and personnel to store the bentonite, cement and other additives under conditions to prevent moisture or other contaminants from interacting or mixing with the materials prior to use in the plant.

2.3 PORTLAND CEMENT

Cement must be Portland Cement Type II or Type V (per ASTM C150/C150M).

Provide a record copy cement supplier recent written certificate (less than 1 year old) specifying cement quality. The Cement Certification submittal must correspond to the current source of cement. Submit statement(s) signed by an authorized official to certify on behalf of the manufacturer of the materials attesting that the products meet specified requirements. The statement must be dated after the award of the

SECTION 31 56 14 Page 13

Contract, must state the Contractor's name, address, must name the project and location, and must list the specific requirements which are being certified.

2.4 BENTONITE

Furnish a recent, written Bentonite Certification (less than 1 year old) and a copy of the test reports from the bentonite supplier for each lot of bentonite shipped to the site stating that the bentonite complies with all applicable standards. The bentonite must be sodium cation base montmorillonite powder that conforms to API Spec 13A , Section 9.

Bentonite must be new, pulverized, high-swelling natural sodium cation montmorillonite (Premium Grade Wyoming-type bentonite). Chemically treated bentonite will not be allowed. No bentonite from the bentonite manufacturer must be used prior to acceptance by the Contracting Officer.

All bentonite must be subject to inspection, sampling, and verification of quality by Contractor QC testing and Government QA testing. Bentonite not meeting specifications must be promptly removed from the site and replaced with bentonite conforming to specification requirements at the Contractors expense. Protect bentonite from moisture during transit and storage.

Submit statement(s) signed by an authorized official to certify on behalf of the manufacturer of the materials attesting that the products meet specified requirements. The statement must be dated after the award of the Contract, must state the Contractor's name, address, must name the project and location, and must list the specific requirements which are being certified.

2.5 ADMIXTURES

Submit proposed use of admixtures, for to approval. Provide written documentation supporting the proposed use of all admixtures.

Documentation must address the effects of the admixture on the cutoff wall SCB material, long-term stability and the admixture and the SCB material, and any potential effects on the natural environment. Peptizing or bulking agents must not be mixed with the cement or bentonite slurry.

Admixtures must be proven with the trial design mixes. Use only admixtures approved by the Government. Retarders, fly ash, or other solids containing heavy metals are prohibited. Submit a recent (less than 1 year old) Admixture Certification for each lot of admixtures.

2.6 WATER

2.6.1 Source

Refer to SECTION 01 50 00 , TEMPORARY CONSTRUCTION FACILITIES AND CONTROLS for information on potential water supplies and the requirements that apply to providing the water supply for construction of the Project.

Provide the water sources used for production and associated pH, hardness, total dissolved solids analysis (water sources used for production must be same as trial mix). City hydrants if used by Contractor must be identified in work plan: (1) note the locations of hydrants for use, and (2) procure appropriate permits. The Contractor must abide by any and all regulations and other requirements governing such use. The Contractor must include the cost of all related fees in the bid items pertinent to the Work.

2.6.2 Water Quality

The water must comply with the standards specified below. The Contractor must furnish Water Quality Test Results for water used for mixing with the

SECTION 31 56 14 Page 14 slurry to assure conformance with these standards.

Property Pr oper t y Requi r ement Test Met hod pH Vale 7.0 +/- 1.0 API RP 13B-1

Total Dissolved Solids <500 ppm EPA 600/4-90/027F

Oil, organics, acids, or other deleterious

<50 ppm each API RP 13B-1

Hardness <50 ppm API RP 13B-1

Water quality variances may be accepted for use based upon performance in the SCB mix as long as the required permeability and strength standards specified herein for the in place SCB wall are achieved throughout the project. Furnish water quality test results for water used for mixing the bentonite slurry and cement slurry to assure conformance with the above limits. Water used for production must come from the same source as water used for the mix design. Abide by any and all Federal, State of California, and local regulations and other requirements governing such use. Include the cost of all related fees in the bid items pertinent to the work. Water must not be taken from the river for construction activities, except when required for testing and with the Contracting Officer's approval.

2.7 SOI L- CEMENT- BENTONI TE MI XTURE

The procedures by which the Contractor will inject, calculate, and monitor quantities of bentonite, cement, and water must be defined by the Results of a Laboratory and Demonstration Section of the successfully constructed SCB cutoff wall.

The SCB mixture must consist of in situ soil mixed with water (both in situ and added), cement, and bentonite to form a low permeability wall.

The cement and bentonite must consist of either a slurry mixture or dry application with water injection as needed for the DMM method. The cement and bentonite must meet the requirements specified. The initial mixture must contain a minimum of four percent bentonite and five percent cement by dry weight of soil. The final mix proportions must be determined by the testing result of the required demonstration section. Based on the results of the specified demonstration section, the bentonite and/or cement quantities must be adjusted by the contractor as necessary, and as approved by the Contracting Officer to achieve the properties specified below at no additional cost to the Government. The SCB mixture must have the following properties and must meet the requirements in Paragraph

ACCEPTANCE REQUIREMENTS.

The initial design mix may be adjusted by the Contractor if necessary and if approved by the Contracting Officer based on the results of a Laboratory and Demonstration Section and to adapt to changes in field conditions at no additional cost to the Government.

Submit a record of DMM injection materials (cement, bentonite, and water quantities), introduced into the SCB cutoff wall including any additives utilized, and adjustments for each production shift including the date mixed and stations completed.

SECTION 31 56 14 Page 15

2.8 MATERIAL STORAGE FACILITY

The Contractor must provide all necessary materials, equipment and personnel to store the bentonite, cement, and other additives under conditions to prevent moisture or other contaminants from mixing with the materials prior to use.

2.9 ENVIRONMENTAL PROTECTION

The raw materials and other supplies used in the const r uct i on of t he SCB cut of f wal l and any spoi l di sposed of must be non- hazar dous and must compl y with Section 01 57 19 TEMPORARY ENVIRONMENTAL CONTROLS (SANTA ANA RIVER BASIN) to prevent, and provide for abatement and control of, any environmental pollution arising as a part of the work.

2.10 DISPOSAL SITE

SCB cut of f wall spoils that are not suitable for use per Section 31 00 00 EARTHWORK must be disposed of off-site at the Contractor's expense.

2.11 EQUIPMENT

Furnish all necessary plant and equipment for use on this Project. The Contractor must obtain and maintain at the jobsite a supply of spare critical replacement parts or backup equipment sufficient to allow the SCB cutoff wall construction to proceed with minimum loss of time due to mechanical breakdown or equipment failure. Calibration of Scales and Flow Meters must be provided by the Contractor.

2.11.1 DMM Drilling Equipment

The equipment must be capable of excavating the required minimum width of wall. The equipment must be able to excavate 10 feet deeper than the maximum depth shown on the Drawings in the areas the equipment is proposed for use. The Contractor must provide written description on the method for verifying vertical tolerance and must be accepted by the Contracting Officer as part of the SCB Cut of f Wal l and DMM I mpl ement at i on Pl an submittal package.

If there is instability of the SCB cutoff wall due to excavation, the Contractor must repair the wall at no expense to the Government.

2.11.2 DMM Mixing Equipment

The DMM equipment used for batching and mixing the cement, bentonite, and injected water must be capable of mixing the materials into a homogeneous mixture conforming to the contract specification requirements. Mixing equipment must be capable of continually mixing the in situ wall material to provide and maintain a uniform blended SCB cutoff wall.

The DMM equipment must have a controlled weighing or metering system for assuring that the dry and/or wet constituents of the mixture are properly proportioned.