W912EP17R0008_Amendment_0006.pdf

W32CS570057098

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15A. NAME AND TITLE OF SIGNER (Type or print)

30-105-04EXCEPTION TO SF 30

APPROVED BY OIRM 11-84

STANDARD FORM 30 (Rev. 10-83) Prescribed by GSA

FAR (48 CFR) 53.243

Herbert Hoover Dike Rehabilitation Project, Reach 1 Cutoff Wall Extension, Palm Beach County, Florida

This Amendment is being issued for the follow ing:

See the attached SF30 Continuation page for details of this amendment.

1. CONTRACT ID CODE PAGE OF PAGES

J 1

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

16C. DATE SIGNED

BY

16B. UNITED STATES OF AMERICA15C. DATE SIGNED15B. CONTRACTOR/OFFEROR

(Signature of Contracting Officer)(Signature of person authorized to sign)

8. NAME AND ADDRESS OF CONTRACTOR (No., Street, County, State and Zip Code) X W912EP-17-R-0008

X 9B. DATED (SEE ITEM 11)

18-Apr-2017

10B. DATED (SEE ITEM 13)

9A. AMENDMENT OF SOLICITATION NO.

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offer is extended, is not extended.

Offer must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended by one of the following methods:

(a) By completing Items 8 and 15, and returning 1 copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN

REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE

CONTRACT ORDER NO. IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(B).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

E. IMPORTANT: Contractor is not, is required to sign this document and return copies to the issuing office.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

10A. MOD. OF CONTRACT/ORDER NO.

2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO.(If applicable)

6. ISSUED BY

3. EFFECTIVE DATE

26-May-2017

CODE

USA ENGINEER DISTRICT, JACKSONVILLE

CONTRACTING DIVISION

701 SAN MARCO BLVD

JACKSONVILLE FL 32207-8175

W912EP 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE

See Item 6

FACILITY CODECODE

EMAIL:TEL:

X

SECTION 00010A

LINE ITEMS AND PRICING SCHEDULE

HERBERT HOOVER DIKE REHABILITATION PROJECT

REACH 1 CUTOFF WALL EXTENSION

PALM BEACH COUNTY, FLORIDA

W912EP-17-R-0008 00010A-1 Amendment 0006

LINE ITEM DESCRIPTION QUANTITY UNIT UNIT PRICE TOTAL

PHASE 1 (DEMONSTRATION SECTION, STATION 2569+00 TO STATION 2576+00)

0001 MOBILIZATION AND DEMOBILIZATION JOB $_______________

0002 WORK PLATFORM INSTALLATION

(ESTIMATED QUANTITY) 600 LINEAR FOOT $___________ $_______________

0003 WORK PLATFORM REMOVAL

(ESTIMATED QUANTITY) 600 LINEAR FOOT $___________ $_______________

0004 CUTOFF WALL (STA. 2570+00 TO STA. 2575+00)

(ESTIMATED QUANTITY) 29,000 SQUARE FOOT $___________ $_______________

0005 VERIFICATION CORING/TESTING

(ESTIMATED QUANTITY) 5 EACH $___________ $_______________

0006 STANDBY TIME 80 DAY $___________ $_______________

0007 CONTRACTING OFFICER'S FIELD OFFICE 47 MONTH $___________ $_______________

TOTAL PHASE 1 (LINE ITEMS 0001 THROUGH 0007) $_______________

PHASE 2 (STATION 2574+00 TO STATION 2698+00 AND STATION 2723+00 TO STATION 2908+00)

0008 MOBILIZATION AND DEMOBILIZATION JOB $_______________

0009 WORK PLATFORM INSTALLATION

(ESTIMATED QUANTITY) 30,700 LINEAR FOOT $___________ $_______________

0010 WORK PLATFORM REMOVAL

(ESTIMATED QUANTITY) 30,700 LINEAR FOOT $___________ $_______________

0011 CUTOFF WALL (STA. 2575+00 TO STA. 2697+00

AND STA. 2724+00 TO STA. 2907+00)

(ESTIMATED QUANTITY) 1,637,600 SQUARE FOOT $___________ $_______________

0012 VERIFICATION CORING/TESTING

(ESTIMATED QUANTITY) 123 EACH $___________ $_______________

0013 PIEZOMETERS JOB $_______________

0014 12" DIP REMOVAL JOB $_______________

0015 TRANSPORT STOCKPILE MATERIAL JOB $_______________

TOTAL PHASE 2 (LINE ITEMS 0008 THROUGH 0015) $_______________

TOTAL PHASES 1 AND 2 (LINE ITEMS 0001 THROUGH 0015) $_______________

SEE NEXT PAGE.

HERBERT HOOVER DIKE REHABILITATION PROJECT

REACH 1 CUTOFF WALL EXTENSION

PALM BEACH COUNTY, FLORIDA

W912EP-17-R-0008 00010A-2 Amendment 0006

LINE ITEM DESCRIPTION QUANTITY UNIT UNIT PRICE TOTAL

PHASE 3 (STATION 2696+00 TO STATION 2725+00)

0016 WORK PLATFORM INSTALLATION

(ESTIMATED QUANTITY) 2,800 LINEAR FOOT $___________ $_______________

0017 WORK PLATFORM REMOVAL

(ESTIMATED QUANTITY) 2,800 LINEAR FOOT $___________ $_______________

0018 CUTOFF WALL (STA. 2697+00 TO STA. 2724+00)

(ESTIMATED QUANTITY) 150,320 SQUARE FOOT $___________ $_______________

0019 VERIFICATION CORING/TESTING

(ESTIMATED QUANTITY) 11 EACH $___________ $_______________

0020 PIEZOMETERS JOB $_______________

TOTAL PHASE 3 (LINE ITEMS 0016 THROUGH 0020) $_______________

TOTAL PHASES 1 THROUGH 3 (LINE ITEMS 0001 THROUGH 0020) $_______________

PHASE 4 (STATION 2566+00 TO STATION 2571+00)

0021 WORK PLATFORM INSTALLATION

(ESTIMATED QUANTITY) 400 LINEAR FOOT $___________ $_______________

0022 WORK PLATFORM REMOVAL

(ESTIMATED QUANTITY) 400 LINEAR FOOT $___________ $_______________

0023 CUTOFF WALL (STA. 2567+00 TO STA.2570+00)

(ESTIMATED QUANTITY) 17,400 SQUARE FOOT $___________ $_______________

0024 VERIFICATION CORING/TESTING

(ESTIMATED QUANTITY) 3 EACH $___________ $_______________

TOTAL PHASE 4 (LINE ITEMS 0021 THROUGH 0024) $_______________

TOTAL BID (LINE ITEMS 0001 THROUGH 0024) $_______________

SEE NOTES ON NEXT PAGE.

HERBERT HOOVER DIKE REHABILITATION PROJECT

REACH 1 CUTOFF WALL EXTENSION

PALM BEACH COUNTY, FLORIDA

W912EP-17-R-0008 00010A-3 Amendment 0006

NOTES: (1) SEE SECTION 00100 INSTRUCTIONS TO OFFERORS.

(2) OFFERORS MUST PRICE ALL LINE ITEMS.

(3) SEE CLAUSE "PREPRICING VARIATION IN ESTIMATED QUANTITY" PARAGRAPH 999.211-1 (SECTION 00800).

(4) THE STATIONS INDICATED FOR EACH PHASE INCLUDE THE CUTOFF WALL AND SUPPORTING FEATURES, SUCH AS THE WORK PLATFORM, WHICH MAY OVERLAP. STATIONS INDICATED IN THE "CUTOFF WALL" LINE ITEMS ARE

THE ACTUAL LIMITS OF CUTOFF WALL IN EACH PHASE.

(5) THE CONTRACTING OFFICER WILL ISSUE A SEPARATE NOTICE TO PROCEED (NTP) FOR EACH PHASE OF WORK.

SF 30 CONTINUATION SHEET

Herbert Hoover Dike Rehabilitation Project Reach 1 Cutoff Wall Extension Palm Beach County, Florida

W912EP-17-R-0008 2 Amendment 0006

SUMMARY OF CHANGES

1. SPECIFICATIONS:

A. In some Volume 1 sections, asterisks appear before and after the line or lines where revisions have been made to the text, and pertain only to changes made by this amendment. In some cases, replacement clauses are attached to this amendment.

B. In Volume 2 sections, the text changes have been updated with additions noted by underlined text and deletions noted by line/cross-outs, and pertain only to changes made by this amendment. The entire section is replaced if there is any change. The Project Table of Contents and Submittal Register are replaced without underlines and cross-outs if there are changes to these documents.

Changes to Specifications:

Volume 1 of 2 – Contract Documents:

DELETE Section 00010A Line Item and Pricing Schedule and REPLACE with the attached revised Section 00010A.

DELETE FAR CLAUSE 52.211-10 COMMENCEMENT, PROSECUTION AND COMPLETION OF WORK (APR 1984) AND REPLACE WITH THE BELOW FAR CLAUSE 52.211-10 COMMENCEMENT, PROSECUTION AND COMPLETION OF WORK (APR 1984) which entails the period of performance change from 1,398 calendar days to 1,418 calendar days.

52.211-10 COMMENCEMENT, PROSECUTION, AND COMPLETION OF WORK (APR 1984)

The Contractor shall be required to (a) commence work under this contract within 60 calendar days after the date the Contractor receives the notice to proceed, (b) prosecute the work diligently, and (c) complete the entire work ready for use not later than See below. The time stated for completion shall include final cleanup of the premises.

Phase 1 – 237 calendar days Phase 2 – 930 calendar days Phase 3 - 121 calendar days Phase 4 – 130 calendar days

Total – 1,418 calendar days plus 90 days for grass establishment

(End of clause)

Volume 2 of 2 – Technical Specifications:

DELETE Section 02 32 00 and REPLACE with the attached revised Section 02 32 00.

DELETE Section 02 35 29 and REPLACE with the attached revised Section 02 35 29.

2. DRAWINGS:

N/A

(End of Summary of Changes)

HHD Rehabilitation Project, Reach 1 Cutoff Wall W912EP-17-R-0008 Extension, Palm Beach County, Florida

SECTION TABLE OF CONTENTS

DIVISION 02 - EXISTING CONDITIONS

SECTION 02 32 00

VERIFICATION DRILLING AND PERMEABILITY TESTING OF IN-PLACE CUTOFF WALL

PART 1 GENERAL

1.1 REFERENCES

1.2 SYSTEM DESCRIPTION

1.2.1 Core Drilling

1.2.2 In-situ Permeability Testing

1.3 SUBMITTALS

1.4 SEQUENCING AND SCHEDULING

1.5 QUALIFICATIONS

1.5.1 Driller

1.5.2 Borehole Logger

1.5.3 Hydrogeologist

1.5.4 Borehole Camera Specialist

PART 2 PRODUCTS

2.1 CORE BOXES

2.2 LABELS

2.3 BOREHOLE CAMERAS

2.3.1 First Borehole Camera

2.3.2 Second Borehole Camera

2.4 Electronic Water Level Gauge (Pressure Troll)

PART 3 EXECUTION

3.1 EQUIPMENT AND SUPPLIES

3.1.1 Core Drilling

3.1.2 In-Situ Permeability Testing

3.2 CORE DRILLING

3.2.1 Procedure

3.2.2 Casing Installation

3.2.3 Drilling Deviation Measurements

3.2.4 Arrangement of Core

3.2.5 Preservation of Core

3.2.6 Labeling, Marking and Packing Core

3.2.7 Selection of Test Samples

3.2.7.1 Compressive Strength Testing

3.2.7.2 Laboratory Permeability Testing

3.2.8 Disposition of Core

3.3 IN-SITU PERMEABILITY TESTING

3.3.1 Test Coordination and Documentation

3.3.2 Permeability Testing

3.3.3 Stage 1 Falling Head Test for Cutoff Wall

3.3.4 Stage 2 Water Pump Test/Rising Head Recovery for Cutoff Wall

3.4 DISPOSITION OF BOREHOLES WITH APPROVED TESTS

3.5 ABANDONED AND SUPPLEMENTAL VERIFICATION BORINGS

SECTION 02 32 00 Page 1 Amendment 0006

3.6 DECOMMISSIONING

3.7 RECORDS

3.7.1 360-degree Video Recording

3.7.2 Vertical Video Recording

3.8 FIGURE 1 - REPORT OF FALLING HEAD PERMEABILITY TEST

-- End of Section Table of Contents --

SECTION 02 32 00 Page 2 Amendment 0006

SECTION 02 32 00

VERIFICATION DRILLING AND PERMEABILITY TESTING

OF IN-PLACE CUTOFF WALL

PART 1 GENERAL

1.1 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.

ASTM INTERNATIONAL (ASTM)

ASTM C511 Standard for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage. Tanks Used in the Testing of Hydraulic Cements and Concretes.

ASTM D2113 (2008) Rock Core Drilling and Sampling of Rock for Site Investigation

ASTM D2166 (2006) Standard Test Method for Unconfined Compressive Strength of Cohesive Soil

ASTM D5084 (2010) Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a Flexible Wall Permeameter

1.2 SYSTEM DESCRIPTION

The Contractor shall provide verification drilling and sampling (verification borings) of the completed cutoff wall to determine the continuity, homogeneity, in-situ permeability of the cutoff wall, and to obtain samples of sufficient quality for required laboratory testing. This is to be accomplished by means of core drilling and permeability testing.

Perform all verification drilling and sampling (verification borings) Monday through Friday (8AM through 5PM). The equipment and techniques to be used shall be submitted in the Drilling Plan .

Verification borings shall be drilled at depths and locations directed by the Contracting Officer. Laboratory testing of wet grab samples will supplement the testing from verification borings. Permeability tests shall be performed in-situ for each open hole. Borehole Camera surveys of the entire verification boring shall be performed concurrently with the rising head stage of tests on constructed cutoff wall.

1.2.1 Core Drilling

Drilling of cores shall be by any approved standard and accepted method of rotary core drilling ( ASTM D2113) that will provide continuous and complete cores of the required diameter over the entire depth of the constructed cutoff wall. The method used shall provide excellent recovery of cores from the cutoff wall with potential sand lenses and unmixed

SECTION 02 32 00 Page 3 Amendment 0006 zones, and not cause damage to the cutoff wall.

1.2.2 In-situ Permeability Testing

In-situ permeability testing is the process of introducing water into or extracting water out of the cutoff wall through verification borings for the purpose of determining the in-situ permeability of the cutoff wall.

1.3 SUBMITTALS

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

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. The following shall be submitted in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Drilling Plan ; G, DO

Prior to starting work, the Contractor shall submit a plan for drilling, sampling, testing, and safety. The plan shall include, but not be limited to; the proposed method of drilling and sampling including a description of the sampling and testing tools that will be used, a listing of any subcontractors to include a description of how the subcontractors are to be used and a description of all methods and procedures to be utilized to ensure a safe operation and to protect the environment. This submittal shall also include a statement of the prior experience, in the type of work described in these specifications, of the Borehole Logger(s) and Driller(s) designated to perform the work specified herein. No work shall be performed until this plan has been approved and no deviation from the approved plan will be permitted without prior approval by the Contracting Officer. Coordinate the Drilling Plan with Section 01 57 50 DRILLING PROGRAM PLAN.

Verification Boring Reports ; G, DO

The Contractor shall submit for each complete verification boring, legible copies of verification boring reports in accordance with paragraph RECORDS below.

In-Situ Permeability Testing Plan ; G, DO

The Contractor shall submit a plan for in-situ permeability testing. The plan shall include, but not be limited to; a description of all methods and procedures for performing the in-situ permeability testing, data reduction, equations, all assumptions used to determine the permeability of the cutoff wall, manufacturer's data specification sheets for all equipment and materials to be used, and calibration certificates less than 60 days old from the start of testing on all pressure gauges and flow meters used during the in-situ testing.

Include/describe in this plan the following:

a) Proposed methods and procedures for performing in-situ permeability testing. Include the proposed form used to document time and water level readings and other data pertinent to

SECTION 02 32 00 Page 4 Amendment 0006 permeability testing.

b) Procedures for collecting and analyzing all flow rate-time-water level data from the falling head tests (Stage 1), which will be used to calculate the in-situ permeability of the cutoff wall above the groundwater table.

c) Procedures for collecting and analyzing all flow rate-time-water level data from the Stage 2 rising head recovery test, which will be used to calculate the in-situ permeability of the cutoff wall below the groundwater table.

d) The in-hole submersible pump size, geometry, characteristic curves, and manufacturer's operating manuals for the Stage 2 phase of testing of the cutoff wall. The selected pumping equipment shall eliminate any electromagnetic influence that could affect the resolution of the borehole camera.

e) Sketches detailing how all equipment (pump, camera, and pressure troll) will be simultaneously inserted into the borehole for observing the quality of the in-situ cutoff wall under external water pressure during Stage 2 testing.

f) Details of how the water level will be kept low enough during Stage 2 testing to accommodate a full borehole camera survey in a dry hole.

BOREHOLE CAMERAS; G, DO

Provide manufacturer's data specification sheets and operating manuals for the borehole camera(s) to be used for the borehole surveys described in PRODUCTS below. Indicate in the submittal the capabilities of the encoder to provide date and time stamps on the video.

Electronic Water Level Gauge (Pressure Troll) ; G, DO

Provide manufacturer's data specification sheets and operating manuals for the electronic water level gauge (pressure troll) as described in PRODUCTS below.

Casing Installation Plan ; G, DO

Submit a plan detailing the installation process for the required continuous steel or PVC casing that connects the top of the work platform to the top of the cutoff wall for QC testing. This plan shall indicate the methodology for casing installation, size and length of casing, and the means of providing a watertight seal between the casing and top of the cutoff wall as described in paragraph CASING INSTALLATION below. The casing size provided shall be large enough to accommodate all testing and inspection equipment. If steel casing is used, the Contractor shall ensure that the appropriate camera type and/or precautions are taken to eliminate interference with downhole cameras.

SD-06 Test Reports

Core Disposal Notification

SECTION 02 32 00 Page 5 Amendment 0006

Notify the Contracting Officer 30 calendar days prior to disposal of cores as required in subparagraph "Disposition of Core" in paragraph CORE DRILLING below.

1.4 SEQUENCING AND SCHEDULING

Acceptance of a segment of cutoff wall will not be approved until the verification drilling and testing is performed and the performance requirements are satisfied. Cutoff wall construction shall not extend greater than 9000 linear feet beyond the closest accepted verification boring. The Contractor shall plan activities accordingly.

a. The location of verification borings at each cutoff wall location shall be determined by the Contracting Officer. Verification boring locations will be determined within ten (10) days after placement of cutoff wall.

b. Verification borings may be added or deleted as required by the Contracting Officer. For bidding purposes, assume at least one verification borings will be performed every 250 linear feet (LF) of cutoff wall constructed. The Contracting Officer may reduce the frequency of verification borings if testing consistently meets specified requirements. One verification boring will be required at each connection to existing cutoff wall for record only. A minimum of ten (10) five (5) verification borings shall be performed in the Demonstration Section.

c. Additional verification borings that exceed the quantity above will be paid at the unit rate.

1.5 QUALIFICATIONS

1.5.1 Driller

The driller shall have experience using cutoff wall drilling equipment similar to the equipment to be used for this contract. The experience shall include a minimum of 2 projects of depths greater than 60 feet and a minimum length of 1000 feet using equipment similar to that being used for this contract.

1.5.2 Borehole Logger

Provide a qualified Borehole Logger, either a Geologist or Geotechnical Engineer, licensed in the any state, if not signing and sealing the report, experienced in subsurface exploration to oversee all drilling, sampling, and in-situ testing operations. A State of Florida license is required only if the individual is signing and stamping the documents.

This individual shall also be responsible for the preparation of all samples for delivery.

The presence of a Government representative or the keeping of separate drilling records by the Contracting Officer shall not relieve the Contractor of the responsibility for the work specified in this specification.

1.5.3 Hydrogeologist

The Hydrogeologist shall be an individual who has had experience with at least 5 projects of cutoff wall or bottom seal construction requiring

SECTION 02 32 00 Page 6 Amendment 0006 in-place permeability testing using the methods proposed for this contract. A qualified geologist or geotechnical engineer can also serve as the Hydrogeologist.

1.5.4 Borehole Camera Specialist

Provide a qualified Borehole Camera Specialist with applicable demonstrated experience on at least 3 projects (performed within 5 years of NTP) in the operation and maintenance of borehole cameras and field operated video recording equipment.

PART 2 PRODUCTS

2.1 CORE BOXES

Longitudinally partitioned, hinged top, core boxes shall be used for all cores.

2.2 LABELS

Core boxes shall be identified by permanent marker or stenciled labels.

The information on this label shall contain the following:

PROJECT: HERBERT HOOVER DIKE REHABILITATION, REACH 1 CUTOFF WALL

EXTENSION PROJECT

HOLE NO.: STATION __________

CORE DEPTH: __________ to __________

BOX NO.: __________

TOTAL NUMBER OF BOXES FOR THE HOLE: __________

2.3 BOREHOLE CAMERAS

Two types of borehole cameras are required:

2.3.1 First Borehole Camera

The first borehole camera is for making a 360 degree log of the verification boring. The camera shall meet the following minimum requirements:

TYPE: Digital Optical Borehole Televiewer.

FRAME RATE: 20HZ.

EXPOSURE: 6.

LIGHTING: 10.

RESOLUTION: 900 pixels.

LOGGING SPEED: 2.9 feet/minute.

2.3.2 Second Borehole Camera

The second borehole camera is for video logging QC permeability tests and is a closed circuit television (CCTV) video camera and shall be used in conjunction with cored boreholes in the cutoff wall. The camera shall be capable of fitting inside of all holes drilled in the cutoff wall. The

SECTION 02 32 00 Page 7 Amendment 0006 camera shall also be capable of viewing directly downhole, as well as the sidewalls of all holes, along the entire length of the hole and be able to operate in either a dry or water-filled borehole.

a. The camera and all attached appliances shall fit within any borehole and/or rotary exploratory hole used on the project. The camera shall be able to easily pass through the entire length of all holes. It should be noted that a submersible pump, power supply cable and discharge piping will be positioned in the borehole during the camera run and the camera must also be able to traverse the borehole with this in-place equipment. The selected pumping equipment shall eliminate any electromagnetic influence.

b. The camera must be capable of operating to a maximum depth of 100 feet of water (45 psi).

c. The camera shall be able to view directly down the borehole, and also have pan/tilt and 360 degrees rotation of the camera field of view. Alternatively, the CCTV camera can have direct viewing downhole and laterally to view the sidewalls of the corehole. All other requirements for CCTV camera shall be adhered to.

d. Video camera and monitor shall be color and high resolution.

e. A DVD recorder, or digital media recorder (as approved by the Contracting Officer) shall be provided with the borehole camera and be used to instantaneously record images captured by the borehole camera.

f. Camera must be capable of operating inside any hole for a minimum of 4 hours without fogging or condensation and should be able to operate in wet or dry conditions. The camera shall be able to operate at a temperature of at least 65 degrees Celsius (150 degrees Fahrenheit).

g. The camera shall have a minimum variable lighting of 20 lux @ 1 meter and prevent any glinting (reflective light) problems with viewing the side walls of any bore hole.

h. Camera shall be self-focusing or remotely controlled manually.

All camera functions including focus, iris, camera orientation and lighting intensity shall be controllable from the surface, either manually or automatically.

i. A controller and encoder shall be provided and will project onto the color monitor and stamp digital image with the following information in real time: hole or location identification, clock time (resolution to 1/30 second or better) and location (depth and orientation).

j. The color image shall be compliant with National Television System Committee format (i.e., a closed circuit television (CCTV) camera format) and have a scan rate of at least 620 lines at 50 HZ, and a resolution of at least 320 lines TV.

k. Camera shall be lowered and raised manually or by using an electrically powered winching system, with depth encoder and LCD depth display integrated into the winching system.

l. For cutoff wall material deemed as non-compliant, the boreholes

SECTION 02 32 00 Page 8 Amendment 0006 associated with the non-compliance shall have the compass orientation (N-S-E-W) of the field of view obtained using the optical televiewer to determine the azimuth and depth of non-compliant material. These images will be used to supplement the CCTV camera video.

2.4 Electronic Water Level Gauge (Pressure Troll)

An electronic water level gauge, or pressure troll, is an in-hole electronic water level instrument with pocket PC data logging capabilities. The pressure troll shall be used to precisely monitor the water level changes and water temperature during the Stage 1 and Stage 2 in-situ water testing of the cutoff wall. The pressure troll selected shall have the following minimum technical specifications:

1. Primary sensor shall be a piezoresistive titanium pressure sensor, with a gauged (vented) pressure range of 30 psig (69 feet of water). Pressure accuracy shall be +/-0.05% FS @15 Deg Celsius, and +/-0.1% across the entire pressure / temperature range of the device.

Sensor shall have a resolution of +/-0.005% FS or better.

2. Temperature sensor shall be a silicon based sensor with a temperature range of -20 Deg C to 80 Deg C. Temperature accuracy shall be +/- 0.1 Deg C, with a resolution of +/-0.01 Deg C.

3. Pressure troll shall have automatic temperature compensation, along with automatic barometric compensation using vented cables.

Vented cables shall have a replaceable desiccant bottle which screws directly to the vented cable.

4. Cables for up to 150 feet of testing shall be vented, quick connect type cables shall be jacked in blue polyurethane coating, with twist-lock titanium connectors. Cables shall be spooled on a steel reel.

5. Probe shall a maximum outer diameter of 0.75 inches and be made of titanium.

6. The power supply shall be self-contained within the probe and consists of a 3.6 volt lithium battery, with a minimum 5 year life.

7. The probe shall have a built-in non-volatile memory (4 MB) and be able to store internally up to 200,000 data records, (one date record = date, time, water head, temperature).

8. The device shall be able to perform fast logging with rates of 4 scans per second, both pressure head and temperature.

9. Data acquisition shall be via a ruggedized pocket PC (running Microsoft Mobile operating system), with software logging capabilities from fast linear scanning to logarithmic decay scheduling. Data export shall be via a USB cable or network hub. Data shall be able to be exported to Microsoft Excel, in a specified data format for import into the numerical analysis package used to calculate the permeability.

10. Calibration certificates traceable to NIST shall be part of the submittal for the pressure troll equipment

11. Data submission protocols and transfer with chain-of-custody and

SECTION 02 32 00 Page 9 Amendment 0006 point-of-source control of data shall be established jointly between the Contractors QC personnel and USACE QA Chief.

PART 3 EXECUTION

3.1 EQUIPMENT AND SUPPLIES

3.1.1 Core Drilling

Equipment to be furnished by the Contractor for core drilling shall include core-drilling machinery of a type or types approved by the Contracting Officer complete with all the accessories needed to take continuous cores. The coring technique selected by the Contractor shall be capable of obtaining samples to a depth of at least 80 feet. Cored samples of constructed cutoff wall shall be sufficient in size and allow insertion of all the in-hole tools for in-situ permeability testing to fit inside the entire length of the hole. Cored samples shall consist of hardened cutoff wall material obtained in a maximum of 5-foot long runs. Supplies for core drilling to be furnished by the Contractor shall include, but not be limited to, all casing, drill rods, core barrels, coring bits, piping, drilling fluids (except bentonite), pumps, potable water, tools, and power required for drilling and all boxes and containers required for core samples. Bentonite shall not be used as a drilling fluid. Selection of the type of bit shall be at the Contractor's discretion provided that the selected bit produces high quality cores capable of providing suitable samples for testing, produces smooth borehole walls to produce high quality video logs, and does not damage the cutoff wall. Care shall be taken not to damage core samples while handling and transportation.

3.1.2 In-Situ Permeability Testing

In-situ permeability testing equipment to be furnished by the Contractor shall be submitted in the In-Situ Permeability Testing Plan . The Contractor shall choose equipment and procedures that will minimize potential damage to the wall. All equipment and supplies used for In-Situ permeability testing shall be approved by the Contracting Officer prior to use.

The Contractor shall monitor water levels in the borehole using the in-hole electronic water level gauge (pressure troll) described in PRODUCTS above; which shall have the capabilities to precisely monitor the water level changes and water temperature during the falling head (Stage

1) and rising head (Stage 2) open hole water testing of the cutoff wall.

The Contractor shall also have a weighted tape with buzzer for obtaining manual water level readings.

3.2 CORE DRILLING

3.2.1 Procedure

All boreholes shall be drilled vertically to within 2 feet of the finished depth of the cutoff wall taking care to not penetrate to the bottom of the cutoff wall. The Contractor shall operate his drills at such speeds and with such down pressures and shall control drill fluid pressures and quantities to ensure maximum core quality and recovery and minimize any damage to the cutoff wall. As measured per core run, the drilling method shall provide core recovery of at least 90 percent and Rock Quality Designation (RQD) of at least 50. Additional core drill locations will be

SECTION 02 32 00 Page 10 Amendment 0006 required if recovery or RQD are below the required values. If the Contractor has difficulty consistently achieving this percentage recovery and RQD, modifications shall be made to the grouting procedures and coring methods. The Contractor shall provide the Contracting Officer 48-hour notification prior to any drilling activities. The notification shall include the location of the boring, the exact time the boring is scheduled to start, and the anticipated completion time. Once notification has been given to the Contracting Officer, the schedule shall not be changed without approval of the Contracting Officer. No drilling or coring shall be performed in the segment of wall being tested until that segment of wall has cured prior to for a minimum of 21 days after placement of the wall . Care shall be taken to ensure that the bore-hole is positioned through the centerline of the cutoff wall. The Borehole Logger shall exercise particular care in recording zones of water loss, cavities, rod jerks, rough drilling and other unusual and non-ordinary coring experiences that, supplementing the core record, will throw light on the nature and the extent of any fracturing or abnormalities. The alignment of all verification boring shall be measured continuously and provided graphically. Upon completion of core drilling, the hole shall be cleaned with potable water containing bleach at 1 gallon of 5.25% sodium hypochloride per 100 gallons of water and flushed until effluent water is clear. The borehole shall then be flushed with potable water to remove any bleach. If water is used as the drilling fluid then bleach does not need to be used when flushing the borehole. The borehole wall shall be free and clear of any residual drilling fluids. Water under low pressure shall be applied so as not to damage borehole wall.

3.2.2 Casing Installation

A steel or PVC casing shall be installed between the top of the working platform and the top of the cutoff wall to be tested. The casing size provided shall be large enough to accommodate all testing and inspection equipment. The casing shall provide a watertight seal with the working platform and shall have a removable end cap. Installation shall be in accordance with the approved Casing Installation Plan . The casing and end cap shall be accessible for additional testing requirements for up to 30 days following installation, or as approved by the Contracting Officer.

3.2.3 Drilling Deviation Measurements

Drilling deviation measurements shall be performed for every quality control coring, and rotary exploratory hole, using an instrument capable of biaxial deviation measurement to determine the magnitude and azimuth of all down-the-hole deviations. The drilling deviation measurements shall be obtained over the entire length of the drill hole. The instrumentation used in drilling deviation measurement shall have the capability of measuring down a depth of at least 80 feet.

3.2.4 Arrangement of Core

All cores shall be washed and arranged neatly in the partitioned boxes in the same sequence in which they occurred before removal from the hole.

Facing the open box with the hinged cover above and the open box below, cores shall be arranged in descending sequence beginning at the left end of the trough nearest the hinges and continuing in the other troughs from left to right. The highest part of the core shall be placed in box 1, and the lower portions of the core shall be placed in the other boxes in consecutive order. A digital photograph of each core run shall be taken clearly showing the label and the wet core, before sample or preservation

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3.2.5 Preservation of Core

The core shall be washed, wrapped in aluminum foil, thin plastic wrap, or cheese cloth and then sealed by applying paraffin wax, microcrystalline wax, or 50/50 mixture of paraffin and microcrystalline wax prior to placing the core in the core box. This sealing process shall be accomplished as soon as possible after the core is removed from the core barrel to prevent desiccation of the core. Other methods of preservation may be applied (as written and approved in the drilling plan) so long as it yields the same degree of core preservation. All core boxes shall be stored in a laboratory moisture room having constant temperature, saturated environment meeting the requirements of ASTM C511 until tested or until otherwise directed by the Contracting Officer. The minimum length of each preserved core shall be no less than 2.5 times the core diameter.

All cored materials with lengths less than 2.5 times the core diameter shall be placed in the core boxes without preservation. Spacer blocks shall be marked and placed in the core box to show where samples have been removed.

3.2.6 Labeling, Marking and Packing Core

Labels for core boxes complying with paragraph CORE BOXES shall be placed on the inside and outside of the top cover in addition to each end. In addition, the depths (or elevations) of each core run/pull shall be marked with a black waterproof pen on the spacer blocks that are placed between core pulls. When a box is full, the space between the core and the trough sides shall be filled with suitable packing material.

3.2.7 Selection of Test Samples

Representative samples of core shall be selected for testing. Two (2) core samples shall be collected at the top, middle, and bottom one-third depths of each verification boring. The samples shall be selected by the Contracting Officer at the completion of each boring. There shall be a minimum of (5) feet between samples. If the core includes zones of backfill of varying quality, samples shall be taken from each zone.

Additional samples may be required by the Contracting Officer to capture variability.

3.2.7.1 Compressive Strength Testing

From each borehole at each depth range, conduct one (1) unconfined compressive strength test on cored samples, for a total of 3 test per corehole. The tests shall be performed in accordance with ASTM D2166. The tests shall be performed within 10 days of samples collected. Additional tests required due to failed tests shall be at Contractor's expense.

3.2.7.2 Laboratory Permeability Testing

From each borehole at each depth range, conduct one (1) laboratory permeability test on cored samples for a total of 3 tests per corehole.

The permeability tests shall be performed on specimens from near the same core run used for unconfined compressive strength tests. The permeability test shall be performed in accordance with ASTM D5084, Method C.

Alternatives to Method C may be used only if approval is granted by the Contracting Officer. Additional tests required due to failed tests shall be at Contractor's expense.

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The permeability test parameters are as follows:

Average Effective Confining Stress: 10 psi.

Hydraulic gradient: 15.

Permeate: Potable water.

Back Pressure: Sufficient to ensure Skempton's pore pressure "B" parameter greater than or equal to 0.95.

3.2.8 Disposition of Core

The Contractor shall protect the filled core boxes from direct sunlight, precipitation, and freezing by some form of shelter that allows ventilation to the boxes. Upon final acceptance of each phase of cutoff wall construction for the contract, the cores shall be disposed of by the Contractor; however, the Contractor shall provide a Core Disposal Notification to the Contracting Officer 30 calendar days prior to disposal of the cores to allow the Government to take possession of any core samples.

3.3 IN-SITU PERMEABILITY TESTING

In-situ permeability testing shall be conducted in two stages of coring in an each open hole as described below. The Hydrogeologist shall be responsible for determining the industry accepted methods and procedures used to determine the in-situ permeability of the cutoff wall. The Hydrogeologist shall be present during permeability tests performed in the demonstration section to establish the approved methods and procedures that will be used during production cutoff wall construction.

3.3.1 Test Coordination and Documentation

The Contractor shall provide the Contracting Officer with 48 hours written notification of any in-situ permeability test. The notification shall include the location and exact time of the test. A minimum of one (1) in-situ permeability test shall be conducted for each 250 linear feet of cutoff wall installed and one (1) test conducted at each connection with the existing wall. A minimum of ten (10) tests shall be performed in the demonstration section, two (2) tests per 100 linear feet of wall. The Contractor shall document the water surface elevation at the time the test starts and the water surface elevation at the completion of the test. The water surface elevations in the hole, along with the time each water surface elevation was taken, shall be provided to the Government within one hour of completion of the permeability test. The final test results shall be signed and sealed by a Registered Engineer.

3.3.2 Permeability Testing

A Stage 1 falling head test shall be performed within the borehole between the top of the cutoff wall and within 1 foot of the groundwater table. If the water level is within 10 feet of the bottom of the cutoff wall, then the depth of cored hole shall be as directed by the Contracting Officer.

The casing seated in the top of the cutoff wall shall have a minimum five

(5) feet extension attached to the casing and shall extend flush with the working ground level. Since the casing will be filled with water during testing, it will require being grouted or sealed by other acceptable methods to prevent leakage and vertical cracks at the seat.

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The Contractor shall also calculate the permeability using the Hvorslev method as shown on in FIGURE 1 for record only. The permeability of the wall when tested and calculated by these methods shall not exceed 1x10-6 cm/sec. The data reduction method shall be that submitted by the Contractor and approved by the Contracting Officer. If cutoff wall material in the cores for Stage 1 are well mixed and allows the borehole to stay open, then the Contractor shall advance to Stage 2 coring and testing. If the cutoff wall material is poorly mixed and/or the boreholes do not remain open, the Contractor shall:

1) Stabilize the non-compliant zone using methods approved by the Contracting Officer.

2) Continue advancing the borehole to the second stage of testing.

The approved method used to isolate the non-compliant zone shall be sufficient in size and allow insertion of all the in-hole tools for in-situ permeability water testing to fit inside the entire length of the hole.

3.3.3 Stage 1 Falling Head Test for Cutoff Wall

The Contractor shall test each hole to determine the effective permeability of the cutoff wall. The in-situ permeability test shall be performed by filling the borehole with potable water. The borehole and casing extension shall be filled with water and pumped until the casing overflows. The Contractor is allowed to pre-soak the borehole. The Contractor shall demonstrate to the Government that the water level in the borehole has achieved steady state flow conditions prior to the start of the official permeability test. Particular attention shall be given to verification borings where unusual circulation of drilling fluid levels were lost in the drilling process. Such boreholes may require an extended period of time to reach steady state flow conditions. During performance of the permeability tests, the water levels shall be recorded at 15 second intervals for a minimum period of 2 hours or until the water level falls within 10% of the pre-test elevation. The Contracting Officer may require the test to be extended at no additional cost to the Government. The Contractor may be required to make check tests at his own expense if the testing equipment or its assembly and arrangement are found to be faulty after the testing of any holes. The Contractor shall record all time and water level readings made on a suitable form approved by the Contracting Officer as included in the In-Situ Permeability Testing Plan . A sample form is shown in FIGURE 1 - REPORT OF FALLING HEAD PERMEABILITY TEST appended after the end of this section.

3.3.4 Stage 2 Water Pump Test/Rising Head Recovery for Cutoff Wall

For the portion of the borehole below the groundwater table to the bottom of the cutoff wall, a water pump/rising head recovery test shall be performed (Stage 2). The Contractor shall be responsible for providing the necessary pump equipment, plumbing and labor as detailed in the Contractor's In-Situ Permeability Testing Plan .

The Stage 2 coring and testing can be performed immediately upon completion of Stage 1 coring and testing, however if the Stage 1 wall is not in compliance with the performance criteria, an adjacent borehole for re-testing will be required at no additional cost to the Government. The Stage 2 coring shall advance the Stage 1 borehole from the water table to within two (2) feet of the bottom of cutoff wall.

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A submersible pump shall be set at the bottom of the borehole, and the pump shall remove the slug of water from inside the hole to just above the pump intake. The pressure troll shall then be lowered in the borehole to just above the pump setting. The borehole camera will be inserted into the borehole and slowly lowered to inspect the interior quality and consistency of the borehole under external water pressure. During the borehole camera monitoring (and after) the water level will be maintained by pumping to keep the water level depressed. Discharge volumes, water levels, temperature, and video footage shall provide information on the cutoff wall under large and sustained hydraulic loading. Water levels and temperature versus clock time shall be recorded throughout pumping (drawdown) and natural recovery (rising head) using the pressure troll equipment, with automated data logging and manual methods as a back-up.

During performance of the permeability test, the water level shall be recorded at 15 second intervals for a minimum period of 24 hours or until 90% recharge is achieved, whichever is less elapsed time. The Contracting Officer may require the test to be extended at no additional cost the Government. Cumulative volume shall be recorded periodically using an automated volume totalizer.

3.4 DISPOSITION OF BOREHOLES WITH APPROVED TESTS

After all QC and QA evaluations have been performed and the results have been approved by the Contracting Officer, the Contractor shall backfill the borehole as required in paragraph DECOMMISSIONING below.

3.5 ABANDONED AND SUPPLEMENTAL VERIFICATION BORINGS

Abandoned verification borings shall be those that drift outside the wall during drilling or those that cannot be drilled to the required depth. The Contractor shall request approval from the Contracting Officer prior to abandonment. All records and test results obtained shall be submitted to the Government. Each verification boring that is abandoned by the Contractor shall be supplemented by another verification boring adjacent to the original. A verification boring shall not be abandoned as a result of a failing acceptance test. Actual locations of any supplemental verification borings will be established by the Contracting Officer. No payment will be made for borings that were abandoned. Approved abandoned verification boring holes shall be backfilled as required in paragraph DECOMMISSIONING below.

3.6 DECOMMISSIONING

The Contractor shall preserve each hole in good condition until directed by the Contracting Officer to fill the hole. All verification borings and water level monitoring wells shall be decommissioned as described in Section 33 29 00 DECOMMISSIONING WELLS. No separate payment will be made for decommissioning verification borings and monitoring wells. The cost of this work shall be included in the drilling costs.

3.7 RECORDS

The Contractor shall keep accurate driller's logs, water levels, photographs, Verification Boring Reports , and records of all work accomplished under this contract and shall deliver complete, legible color copies of these logs and records to the Contracting Officer with applicable in-situ and laboratory testing identified before acceptance of the section of cutoff wall represented by the boring. All such records shall be recorded during the actual performance of the work (for all tests

SECTION 02 32 00 Page 15 Amendment 0006 conducted including failed tests) and shall be preserved in good condition and order. These records shall be submitted in a complete verification boring report to the Contracting Officer no later than 35 days following cutoff wall placement. The Contracting Officer may examine and review all such records at any time prior to their delivery, and may require changes to the record keeping procedure. During the coring operation, information shall be obtained about characteristics of the cutoff wall that may or may not be apparent from the core recovered from the hole. Observations of the drilling action must be made and reported to present as complete a picture, as possible of the consistency of the cutoff wall. When coring, the Contractor's quality control representative should note the amount of water return to the amount being injected through the drill rods. Careful observation of drill water return changes can indicate a potential defective zone. While the drill rod is rotating, the drill action and rate of penetration shall be noted and recorded. Changes in drilling rate can be related to changes in wall composition and provide complimentary data in areas of poor core recovery. Basic information to be included on each core boring log should include:

a. Hole identifier, top of wall elevation, and if applicable, primary pile, secondary pile, panel/pile number, or joint designation.

b. Herbert Hoover Dike alignment station reference.

c. Cutoff wall backfill mix designation.

d. Driller's name and Borehole Logger's name.

e. Make, size, and manufacturer's model designation of drilling equipment.

f. Type of drilling operation by depth .

g. Hole diameter.

h. Dates and time by depths when drilling operations were performed.

i. Time required for drilling each run.

j. Drill action, rotation speed, hydraulic pressure, water pressure, tool drops, and any other unusual and non-ordinary experience which could indicate the subsurface conditions encountered.

k. Depths at which samples or cores were recovered or attempts made to sample or core including top and bottom depth of each run.

l. Classification and description by depths of materials cored including composition, texture, presence and orientation of bedding, foliation, or fractures, presence of inclusions, and the RQD for each cored interval.

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