Amendment_0004_0004.pdf

(x)

140R6022R0006 x x

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 electronic communication which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGEMENT 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 letter or electronic communication, provided each letter or electronic communication makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

x

Billings MT 59107

R60

PO Box 36900 Regional Office Great Plains Region Bureau of Reclamation

11/22/20220004

13. THIS ITEM ONLY APPLIES TO MODIFICATION OF CONTRACTS/ORDERS. IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

12. ACCOUNTING AND APPROPRIATION DATA (If required) is not extended.is extended, Items 8 and 15, and returning

Offers 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

The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

FACILITY CODE CODE

10B. DATED (SEE ITEM 13)

10A. MODIFICATION OF CONTRACT/ORDER NO.

9B. DATED (SEE ITEM 11)

9A. AMENDMENT OF SOLICITATION NO.

CODE

8. NAME AND ADDRESS OF CONTRACTOR (No., street, county, State and ZIP Code)

7. ADMINISTERED BY (If other than Item 6)CODE 6. ISSUED BY

PAGE OF PAGES

4. REQUISITION/PURCHASE REQ. NO.3. EFFECTIVE DATE2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO. (If applicable)

1. CONTRACT ID CODE

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

09/20/2022

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

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority) appropriation data, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

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

ORDER NO. IN ITEM 10A.

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

Fresno Dam and Reservoir Dam Modifications

Fresno Storage Division, Milk River Project, Montana

Missouri Basin Region 5

See Page 2 for changes incorporated by this amendment:

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)15A. NAME AND TITLE OF SIGNER (Type or print)

15C. DATE SIGNED 16B. UNITED STATES OF AMERICA 15B. CONTRACTOR/OFFEROR 16C. DATE SIGNED

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

Gerri Voto-Braun

STANDARD FORM 30 (REV. 11/2016)

Prescribed by GSA FAR (48 CFR) 53.243

Previous edition unusable

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

140R6022R0006

Amendment No. 0004

Description of Changes:

1. In Part I – The Schedule, remove Continuation of Section B– Supplies or Services and

Prices/Cost, in its entirety and substitute therefor the attached revised Continuation of Section B.

2. In Part I – The Schedule, Section C – Specifications, remove Section 01 14 12 - Work

Restrictions in its entirety and substitute therefor the attached revised Section 01 14 12.

3. In Part I – The Schedule, Section C – Specifications, remove Section 31 03 33 - Removal and

Control of Water in its entirety and substitute therefor the attached revised Section 31 03 33.

4. In Part I – The Schedule, Section C – Specifications, remove 32 31 30 - Wire Fence in its entirety and substitute therefor the attached revised Section 32 31 30.

5. In Part I – The Schedule, Section C – Specifications, remove 32 92 20 – Seeding in its entirety and substitute therefor the attached revised 32 92 20.

6. In Part I – The Schedule, Section C – Specifications, remove 33 46 36 - HDPE Pipe Drains and

Outfalls in its entirety and substitute therefor the attached revised 33 46 36.

7. In Part I – The Schedule, Section C – Specifications, remove 33 46 38 - Toe Drain Inspection

Wells in its entirety and substitute therefor the attached revised 33 46 38.

8. In Part I – The Schedule, Section C – Specifications, remove 52 00 00 - Drawings in its entirety and substitute therefor the attached revised 52 00 00.

9. 52 00 00 – Drawings, remove the following drawings, and substitute therefor the attached, same numbered drawings:

Sheet No. Drawing No.

2 15-D-60030 Rev 2 dated 11/16/2022

3 15-D-60031, Rev 2 dated 11/16/2022

For convenience, essential changes on the revised solicitation pages are indicated by a vertical line in the margin where lines or paragraphs changed from the previous version. However, all portions of the revised solicitation pages shall apply whether changes thereon have or have not been indicated.

Acknowledgement: See Block 11 above regarding how to acknowledge this amendment. The

Government must receive the acknowledgement at the place designated for receipt of bids (See Block

10 of the Standard Form 1442).

Receipt of Proposals: The hour and date for receipt of proposals remains the same; 5:00 PM on

November 28, 2022

Third Party: If you have given a copy of the solicitation to someone else, please forward this amendment accordingly.

A list of contractor questions and their respective answers are attached for informational purposes only.

Fresno Dam and Reservoir Dam Modifications Fresno Storage Division, Milk River Project, Montana Amendment No. 0004

Section B

Revised B - 1

CONTINUATION OF

SECTION B – SUPPLIES OR SERVICES AND PRICES/COST

FRESNO DAM AND RESERVOIR

DAM MODIFICATIONS

FRESNO STORAGE DIVISION, MILK RIVER PROJECT, MONTANA

PART 1 GENERAL

1.01 PRICE SCHEDULES

A. Offers will be considered for award on the following Price Schedules, but no offer will be considered for award on only a part of the Price Schedules.

B. Offerors shall complete Price Schedules 1 and 2. Offers for less than the total of Price Schedules 1 and 2 will be considered nonresponsive and will not be evaluated for award.

C. Price Schedule 2 is an Optional Price Schedule. Optional Price Schedule 2 pay items for supplementary temporary observation wells and supplementary deep wells may be awarded no later than 3 months after beginning drilling of primary deep wells.

D. Offers are subject to the terms and conditions of this solicitation.

E. Quantities in the Price Schedules are estimated quantities for comparison of offers only.

Except as provided in the contract clause at FAR 52.211-18, Variation in Estimated Quantity, no claim shall be made against the Government for overruns or underruns.

F. See the contract clause at WBR 1452.232-81, Payment for Mobilization and Preparatory Work, for CLIN 1.

G. Definitions:

1. CLIN – Contract Line Item Number.

Revised B - 2

PRICE SCHEDULE 1

CLIN Section Pay Item Quantity and Unit

Unit Price Amount

1-1 WBR

1452.232

-81

Mobilization and Preparatory Work

For the lump sum of $

1-2 01 55 20 Traffic Control

For the lump sum of $

1-3 03 30 00 Concrete for Curb 65 yd3 $ $

1-4 03 30 00 Concrete for Bridge Rails 6 yd3 $ $

1-5 05 50 00 Miscellaneous Metalwork For the lump sum of $

1-6 06 82 10 Fiberglass Reinforced Plastic (FRP) Fabrications

For the lump sum of $

1-7 23 31 10 Ventilating System For the lump sum of $

1-8 31 02 10 Water for Dust Abatement 18 months $ $

1-9 31 02 10 Dust Palliative For the lump sum of $

1-10 31 03 33 Unwatering within Contractor Designed Unwatering System

13 months $ $

1-11 31 03 33 Unwatering within Government Designed Unwatering Trench

13 months $ $

1-12 31 03 33 Temporary Observation Wells Installation

880 ln ft $ $

1-13 31 03 33 Deep Wells 3,900 ln ft $ $

1-14 31 03 33 Deep Wells Operation 13 months $ $

Revised B - 3

PRICE SCHEDULE 1

CLIN Section Pay Item Quantity and Unit

Unit Price Amount

1-15 31 09 10 Abandoning and Removing Existing Instrumentation

For the lump sum of $

1-16 31 09 11 Abandoning Hydraulic Piezometers and Terminal Wells

For the lump sum of $

1-17 31 09 12 Embankment Measurement Points

86 points $ $

1-18 31 09 13 Temporary Inclinometers 10 temporary inclino-meters

1-19 31 09 14 Monitoring During Construction

For the lump sum of $

1-20 31 11 00 Clearing and Grubbing 110 acres $ $

1-21 31 14 10 Stripping 140,000 yd3

1-22 31 23 12 Excavation for Toe Drain Outfall Channel

2,500 yd3 $ $

1-23 31 23 14 Excavating Existing Grouted Riprap Channel

310 yd3 $ $

1-24 31 23 15 Excavation of Existing Rockfill Zone Material

23,000 yd3 $ $

1-25 31 23 16 Common Excavation 192,200 yd3

1-26 31 23 16 Bedrock Excavation 3,000 yd3 $ $

1-27 31 23 17 Foundation Treatment Using Filter Zone 5A Material

35 yd3 $ $

1-28 31 23 17 Foundation Treatment Using Gravel Drain Zone 6 Material

35 yd3 $ $

Revised B - 4

PRICE SCHEDULE 1

CLIN Section Pay Item Quantity and Unit

Unit Price Amount

1-29 31 23 17 Foundation Treatment Using Slush Grout

74 yd3 $ $

1-30 31 23 17 Foundation Treatment Using Dental Concrete

72 yd3 $ $

1-31 31 23 70 Controlled Low Strength Material

81 yd3 $ $

1-32 31 23 80 Vertical Sand Filter Trench Construction

73,000 ft2 $ $

1-33 31 24 15 Zone 5A, Sand Filter 87,550 yd3 $ $

1-34 31 24 17 Zone 6, Gravel Drain Material

45,230 yd3 $ $

1-35 31 24 18 Zone 7, Buttress Fill Material

346,400 yd3

1-36 31 25 10 Temporary Erosion Control 36 months $ $

1-37 31 25 13 Excavation for Erosion Control Channels

210 yd3 $ $

1-38 31 25 13 Sand and Gravel Bedding for Erosion Control Channels and Toe Drain Outfall Mat

61 yd3 $ $

1-39 31 25 13 Cobbles for Erosion Control Channels and Toe Drain Outfall Mat

164 yd3 $ $

1-40 31 32 32 Geotextile 76,860 yd2 $ $

1-41 31 34 19 Geogrid Reinforcement 6,000 yd2 $ $

1-42 32 10 16 Remove Existing Asphalt Pavement and Base Course

2,570 yd2 $ $

1-43 32 10 16 Cold Plane Existing Asphalt Pavement

39,000 yd2 $ $

Revised B - 5

PRICE SCHEDULE 1

CLIN Section Pay Item Quantity and Unit

Unit Price Amount

1-44 32 11 23 Aggregate Base Course 445 yd3 $ $

1-45 32 12 16 Asphaltic Concrete Pavement

445 yd3 $ $

1-46 32 12 20 Roadway Surfacing 39,000 yd2 $ $

1-47 32 15 10 Gravel Surfacing 5,400 yd3 $ $

1-48 32 17 20 Painted Traffic Lines, Markings, and Legends

For the lump sum of $

1-49 32 31 10 Relocated Chain Link Fence For the lump sum of $

1-50 32 31 30 Smooth Wire Fence 2,100 ln ft $ $

1-51 32 91 20 Placing Topsoil 125 acres $ $

1-52

32 91 60 Topsoil Erosion Control Matting

75,000 yd2 $ $

1-53 32 92 20 Seeding 126 acres $ $

1-54 33 29 04 Removing Existing Toe Drain and Outfall Pipes

2,300 ln ft $ $

1-55 33 46 36 24-inch-Diameter Nonperforated HDPE Pipe

160 ln ft $ $

1-56 33 46 36 24-inch-Diameter Perforated HDPE Pipe

2,200 ln ft $ $

1-57 33 46 36 Drain Cleanouts For the lump sum of $

1-58 33 46 38 Toe Drain Inspection Wells For the lump sum of $

1-59 33 46 38 Outfall Inspection Well For the lump sum of $

1-60 33 46 42 Weir Box For the lump sum of $

1-61 34 71 15 Box Beam Guardrail 292 ln ft $ $

TOTAL FOR PRICE SCHEDULE 1 $_________________

Revised B - 6

PRICE SCHEDULE 2 - OPTIONAL

CLIN Section Pay Item Quantity and Unit

Unit Price

Amount

2-1 31 03 33 Supplementary Temporary Observation Wells Materials

440 ln ft $ $

2-2 31 03 33 Supplementary Temporary Observation Wells Installation/Removal

440 ln ft $ $

2-3 31 03 33 Supplementary Deep Wells Materials

4,700 ln ft $ $

2-4 31 03 33 Supplementary Deep Wells Installation/Removal

4,700 ln ft $ $

2-5 31 03 33 Supplementary Deep Wells Operation

13 months $ $

TOTAL FOR PRICE SCHEDULE 2 $____________

TOTAL FOR PRICE SCHEDULES 1 AND 2 $____________

END OF SCHEDULE

Work Restrictions

Revised 01 14 12 - 1

SECTION 01 14 12

WORK RESTRICTIONS

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. Cost:

1. Include in prices offered in the Price Schedules for other items of work.

1.02 WORK RESTRICTIONS

A. Public access, campgrounds and facilities accessing the Milk River below the dam as shown on drawings will remain closed to the public throughout construction operations.

B. Public will be allowed access to Fresno Reservoir and its recreation areas throughout construction. This includes use of public roads, reservoir boat ramps, houses around the north and south borrow areas, Kiehns Bay Road, and part-time residential areas.

C. The Contractor shall maintain public use of roadways throughout the area not within the road closure limits and access to and from the reservoir and appurtenant facilities during construction except for roadways that will be closed as shown on drawings.

D. Road Closures:

1. Single lane restrictions across dam will be required during the majority of construction activities. See Section 01 55 20 – Traffic Control for additional requirements.

2. Limit temporary full road closures to between 9:00 am to 4:00 pm and each shall not exceed 30 minutes.

3. Full closure of the road while constructing between the spillway wall and Dam Sta. 9+75.

E. Minimum volumes of Zone 5A Embankment Sand, Zone 5B Filter Trench Sand, Zone 6 Gravel Drain Material and Zone 7 Buttress Fill shall be placed in stockpiles on site before beginning embankment excavation. The minimum volumes to be placed in stockpiles are:

1. Zone 5A, Embankment Sand Material: 1,500 cubic yards.

2. Zone 5B, Filter Trench Sand: 1,500 cubic yards.

3. Zone 6, Gravel Drain Material: 1,500 cubic yards.

4. Zone 7, Buttress Fill: 3,000 cubic yards

Revised 01 14 12 - 2

5. Refer to Section 31 24 15 – Zone 5A, Embankment Sand Material, Section 31 23 80 – Vertical Sand Filter Trench, Section 31 24 17 – Zone 6, Gravel Drain Material and Section 31 24 18 – Zone 7, Buttress Fill for specific requirements.

F. Work shall be limited to Monday to Friday 7:00 am to 5:00 pm with 10-hour workdays except for the following removal and control of water activities. Extended shifts and additional shifts to the 10-hour workdays may be requested.

1. Operate, monitor, and maintain dewatering system continuously 24 hours a day when excavation is below El. 2535 and prior to backfill reaching El. 2535.

2. Requests for extended shifts shall be submitted in writing 7 calendar days in advance for extended shifts and 14 calendar days in advance for additional shifts, and shall be subject to approval by the COR.

3. Dewatering system operation shall be in accordance with Section 31 03 33 – Removal and Control of Water.

G. Excavation and placement of filter material and drain material adjacent between the spillway wall and Dam Sta. 9+75 cannot occur until the reservoir water surface elevation is drawn down to El. 2555 or below. Refer to Section 01 14 20 – Reservoir Operations.

H. Winter shutdown: Place and compact Zone 5A, Embankment Sand Material; Zone 5B, Filter Trench Sand Material; Zone 6, Gravel Drain Material, and Zone 7, Buttress Fill at or above El. 2535 prior to demobilization from the site for winter shutdown.

1. Place sacrificial fill if needed to El. 2535.0 before winter shutdown for work between Dam Sta. 9+75 and greater at no additional expense to the Government.

2. Place sacrificial fill if needed to El. 2572.0 before winter shutdown for work between spillway wall and Dam Sta. 9+75 at no additional expense to the Government.

I. Vertical Sand Filter Trench shall be installed at initial excavation El. 2535. The Vertical Sand Filter Trench may be constructed prior to the dewatering system being operational. Refer to Section 31 23 80 – Vertical Sand Filter Trench and drawings.

J. Ground water elevation shall be at or below El. 2500 prior to excavation activities below El. 2535. Refer to Section 31 03 33 – Removal and Control of Water.

K. Preform excavation and earthfill placement in a segmented manner to the linear extents in accordance with Section 31 23 16 – Excavation of Existing Embankment and Foundation and Section 31 24 12 – General Earthfill Construction.

PART 2 PRODUCTS

Not Used

Revised 01 14 12 - 3

PART 3 EXECUTION

Not Used

END OF SECTION

Revised 01 14 12 - 4

This page intentionally left blank.

Removal and Control of Water

Revised 31 03 33 - 1

SECTION 31 03 33

REMOVAL AND CONTROL OF WATER

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. Unwatering within Contractor Designed Unwatering System:

1. Measurement: Time in months.

2. Payment: Unit price offered in Price Schedule 1:

a. Includes the following:

1) Labor, power and standby power, materials, equipment, and other items needed to furnish, install, operate, and maintain an effective unwatering system.

2) Includes sediment basin or other method(s) for removing suspended particles.

3) Route and control any water associated with existing toe drain flows.

4) Abandoning and removing the Contractor Designed Unwatering System.

B. Unwatering within Government Designed Unwatering Trench:

1. Measurement: Time in months.

2. Payment: Unit price offered in Price Schedule 1:

a. Includes the following:

1) Labor, power and standby power, materials, equipment, and other items needed to furnish, install, operate, and maintain an effective unwatering system.

2) Includes sediment basin or other method(s) for removing suspended particles.

3) Abandoning and removing the Government Designed Unwatering Trench.

C. Temporary Observation Wells Installation:

1. Measurement: Linear foot of well installed, measured from ground surface to the bottom of the casing.

2. Payment: Unit price offered in Price Schedule 1:

a. Includes the following:

Revised 31 03 33 - 2

1) Furnishing and installing the materials required for the temporary observation wells, which includes but is not limited to:

a) Filter pack.

b) Screen and casing (including stick-up length above ground surface).

2) Labor for drilling, development, and installation of a functional temporary observation well.

3) Drilling.

4) Removal and abandonment of temporary observation wells.

D. Supplementary Temporary Observation Wells Materials:

1. Measurement: Linear foot of well installed, measured from ground surface to the bottom of the casing.

2. Payment: Unit price offered in Price Schedule 2:

a. Includes the following:

1) Furnish the materials required for the supplementary temporary observation wells, which includes but is not limited to:

a) Filter pack (includes below bottom of casing).

b) Screen and casing (including stick-up length above ground surface).

b. The quantity for supplementary temporary observation wells materials is not subject to the contract clause at FAR 52.211-18, Variation in Estimated Quantity.

E. Supplementary Temporary Observation Wells Installation/Removal:

1. Measurement: Linear foot of well installed, measured from ground surface to the bottom of the casing.

2. Payment: Unit price offered in Price Schedule 2:

a. Includes the following:

1) Labor for drilling, development, and installation of functional supplementary temporary observation well.

2) Drilling.

3) Removal and abandonment of supplementary temporary observation wells.

b. The quantity for supplementary temporary observation wells installation/removal is not subject to the contract clause at FAR 52.211-18, Variation in Estimated Quantity.

Revised 31 03 33 - 3

F. Deep Wells:

1. Measurement: Linear foot of well installed, measured from ground surface to the bottom of the casing.

2. Payment: Unit price offered in Price Schedule 1:

a. Includes the following:

1) Furnishing and installing the materials required for the installation of deep wells, which includes but is not limited to:

a) Filter pack (includes below bottom of casing).

b) Screen and casing (including stick-up length above ground surface).

c) Pump and motor.

d) Manifold piping.

2) Labor for drilling, development, and installation of a functional deep well.

3) Drilling.

4) Operation and maintenance are included in deep wells operation.

5) Removal and abandonment of dewatering wells.

G. Supplementary Deep Wells Materials:

1. Measurement: Linear foot of well installed, measured from ground surface to the bottom of the casing.

2. Payment: Unit price offered in Price Schedule 2:

a. Includes the following:

1) Furnishing the materials required for the supplementary deep wells, which includes but is not limited to:

a) Filter pack.

b) Screen and casing (including stick-up length above ground surface).

c) Pump and motor.

d) Manifold piping, if required.

b. The quantity for supplementary deep wells materials is not subject to the contract clause at FAR 52.211-18, Variation in Estimated Quantity.

H. Supplementary Deep Wells Installation/Removal:

1. Measurement: Linear foot of well installed, measured from ground surface to the bottom of the casing.

Revised 31 03 33 - 4

2. Payment: Unit price offered in Price Schedule 2:

a. Includes the following:

1) Labor for drilling, development, and installation of a functional supplementary deep well.

2) Drilling.

3) Operation and maintenance are included in deep wells operation.

4) Removal and abandonment of supplementary deep wells.

5) Drill rig(s) standby time

b. The quantity for supplementary deep wells installation/removal is not subject to the contract clause at FAR 52.211-18, Variation in Estimated Quantity.

I. Deep Wells Operation:

1. Measurement: Time in months.

2. Payment: Unit price offered in Price Schedule 1:

a. Includes the following:

1) Labor, standby power, and other equipment required to operate and maintain the dewatering wells.

2) Standby pumps for dewatering wells.

3) Design, installation, and removal of dewatering wells discharge and collection system(s) and electrical supply system(s).

4) Power.

J. Supplementary Deep Wells Operation:

1. Measurement: Time in months.

2. Payment: Unit price offered in Price Schedule 2:

a. Includes the following:

1) Labor, power and standby power, electrical system (as needed), and other equipment required to operate and maintain the supplementary dewatering wells.

b. The quantity for supplementary deep wells operation is not subject to the contract clause at FAR 52.211-18, Variation in Estimated Quantity.

1.02 REFERENCE STANDARDS

A. ASTM International (ASTM):

1. ASTM C150/C150M-21 Portland Cement

Revised 31 03 33 - 5

2. ASTM C33/C33M-18 Concrete Aggregates

3. ASTM D1785-21a Poly(Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120

4. ASTM D2487-17 Classification of Soils for Engineerig Purposes (Unifed Soil Classification System)

5. ASTM D4043-17 Selection of Aquifer Test Method in Determining Hydraulic Properties by Well Techniques

6. ASTM D4050-20 Withdrawal and Injection Well Testing for Determining Hydraulic Properties of Aquifer Systems

7. ASTM D5092/D5092M-16 Standard Practice for Design and Installation of Groundwater Monitoring Wells

8. ASTM F480-14 Thermoplastic Well Casing Pipe and Couplings Made in Standard Dimension Ratios (SDR), SCH 40 and SCH 80

9. ASTM D5521/D5521M-18 Standard Guide for Development of Groundwater Monitoring Wells in Granular Aquifers

B. Bureau of Reclamation (USBR)

1. Bureau of Reclamation Engineering Geology Field Manual, Second Edition, Volume I, 1998, Reprinted 2001

C. Institute of Electrical and Electronics Engineers (IEEE):

1. IEEE C2-2017 2017 National Electrical Safety Code(R)

(NESC(R))

1.03 DEFINITIONS

A. Dewatering: Removal and control of groundwater from pores or other open spaces in soil or rock formations to allow construction activities to proceed as intended. This includes relief of groundwater pressure and the control and discharge of effluent water.

B. Unwatering: Control and removal of ponded, seeping, or flowing surface water, emerging subsurface water from excavated surfaces, and water from precipitation within and adjacent to excavations and construction zones using channels, ditches, gravel drains, gravel blankets, pipes, sumps, pumps, and discharge lines. This includes the control and discharge of effluent waters.

Revised 31 03 33 - 6

C. Surging: The result of lowering the pumping water level in a well to the level of the pump intake such that the pump draws in air in a cyclic pattern causing the discharge to come out in surges.

D. Primary: When used to describe power, equipment, and materials indicates operating components of the dewatering and unwatering systems.

E. Standby: Power, equipment, and materials kept on site, unused, but ready for use if primary or supplementary operating components of the dewatering or unwatering system fail.

F. Abandon: To grout well to prevent movement of surface water into aquifers penetrated by the well or sump and to prevent movement of water through the well between aquifers.

G. Dewatering System:

1. Deep wells, and supplementary deep wells: A system of wells pumped by submersible pumps installed within each well.

2. Temporary observation wells and supplementary temporary observation wells:

Used to monitor groundwater levels and is not pumped or have water removed in any fashion beyond development or other diagnostics.

H. Length of Well: The length of blank casing and screen required to provide a deep well or temporary observation well in accordance with the casing and screen lengths shown on the drawings. This is measured from the bottom of the casing shown on the drawings to the ground surface. Stick-up length above the ground surface is not included in this measurement.

I. Development: The act of vigorously moving water in and out of the slots of a well screen in order to accomplish the following:

1. Compact/settle the material immediately adjacent to the slots.

2. Remove finer particles immediately around the slots (whether naturally occurring or induced via drilling).

3. Create a “filter cake” that is more pervious than the surrounding aquifer but does not allow a significant number of particles pass through to the slots.

J. Evaluation period: The time period shall begin with Government acceptance of both the

(1) completion of installation of the dewatering system (entire original designed system) and (2) the start of operation of the dewatering system. The evaluation period shall be complete once the Government has evaluated the efficiency of the completed dewatering system.

K. Run time: The time period shall begin with Government acceptance of the completed dewatering system (entire original designed system) and shall be complete once the Contractor has written approval to begin excavation.

Revised 31 03 33 - 7

1. If required, the run time will reset after the installation of supplementary dewatering systems or other method(s).

L. Planned, system-wide shutdown or shutdown test: A period of time occurring during the evaluation period in which the Contractor will intentionally shut down the entire dewatering system.

M. Dewatering Period: Time during which the dewatering system is operational.

N. Winterization: Preparing the dewatering and unwatering systems for use when ambient temperatures are near, at, and/or below freezing.

O. Soft Restart: Restarting the dewatering system in a staged fashion to reduce the required amperage at a given time.

P. Drill rig standby time:

1. Standby time starts when the drill rig(s) has completed the well installation, the dewatering system, or supplementary system, is operational, and the Contractor maintains the drill rig(s) on site.

2. Standby time ends when the Government allows the Contractor to remove the rig(s) from the site.

3. Idle time due to failure of or required maintenance of drill rig equipment, negligence of the Contractor, or inclement weather conditions shall not be considered as standby time.

1.04 SUBMITTALS

A. Submit the following in accordance with Section 01 33 00 - Submittals.

B. RSN 31 03 33-1, Dewatering Plan:

1. Detailed plan for removal and control of groundwater in order to facilitate construction.

a. Include, at a minimum, the following:

1) Protection of the dewatering system, discharge system, electrical supply system, and any other associated components of the dewatering system(s) during construction activities.

2) Design and selection of discharge systems.

3) Manifold line locations (by site maps or drawings) showing type/size of pipe, above ground vs. below ground, flowmeters, and wiring layout.

4) Locations and types of valves used.

5) Control and disposal of water used in drilling.

Revised 31 03 33 - 8

6) Plan for dry-running protection or use of cycling pumps to continue removing water while protecting pumps.

7) Sedimentation basin design and details.

8) Estimated location of power supply and standby power.

9) Plan for reducing microbiological growth.

10) Winterization of installed dewatering system and addressing freezing temperatures. Includes the following:

a) Primary power systems, standby power systems, and fuel.

b) Header pipes and discharge lines.

2. Sequence and Schedule

a. Schedule of mobilization and delivery of personnel, equipment, and materials for drilling, installing, and testing the dewatering systems and temporary observation wells.

b. Sequence of the dewatering systems and temporary observation wells construction and operation including initial drawdown period, duration, and schedule(s) or period(s) of active dewatering operation for each system.

3. Products and Materials Certifications

a. Well screen manufacturer: Certifying slot width, open area, collapse strength, strength coupling specifications, and slot cleanliness of the screen.

b. Filter pack supplier: Certifying gradation data, source of filter pack material, and physical characteristics of the filter pack material.

4. Equipment Data:

a. Types, sizes, quantities, capacities, sources, and other identifying characteristics for pumps, drive units, power systems, standby equipment, monitoring equipment, flowmeters, valving, and other dewatering system components.

1) Include performance, efficiency and net positive suction head (NPSH) curves for each pump submitted.

b. Joint method used to connect well casing sections.

1) Include manufacturer’s recommended installation procedure, if applicable.

5. Dewatering System Installation:

a. Method(s) and equipment for drilling deep wells and temporary observation wells. Include description of use of water (drilling fluid) to counteract heaving materials.

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b. Method(s) of joining well screen and casing.

c. Method(s) of installing well screen, well casing, and filter pack.

d. Method(s) and equipment for developing deep wells and temporary observation wells.

e. Method(s) of constructing discharge manifolds, settling basins, and erosion control features.

f. Method(s) of controlling water from drilling operations.

C. RSN 31 03 33-2, Unwatering Within Excavation Plan:

1. Include the following:

a. Installation sequence and method.

b. Design for pumping and discharge system.

c. General narrative describing unwatering plan and methods.

1) Include sketches, figures, site maps, etc.

2) Specific plans for controlling runoff and ponded water.

d. Plan and method(s) for removal and abandonment of unwatering system.

e. Estimated location of power supply and standby power supply.

2. Equipment Data:

a. Types, sizes, quantities, capacities, sources, and other identifying characteristics for pumps, drive units, power systems, standby equipment, monitoring equipment, flowmeters, valving, and other unwatering system components.

D. RSN 31 03 33-3, Key Personnel Resumes:

1. Qualifications submitted shall meet minimum requirements of Article 1.05 Qualifications.

a. Drilling Superintendent/Dewatering Specialist(s) responsible for directing dewatering and unwatering system installation and operation.

1) List background and past experience with at least 5 relevant projects similar in nature to that required by this contract with similar subsurface soil site conditions, dewatering depths, construction techniques, and project durations.

2) Include expertise as it relates to dewatering system(s) design, installation, and operation in the following areas:

a) Submersible pump selection for use in dewatering applications

b) Drilling techniques

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c) Well installation

d) Well development

e) Pump installation

f) Discharge system design and installation

g) Electrical system design and installation

b. Dewatering and Unwatering Specialist Assistant(s) responsible for directing unwatering system installation and operation:

1) List background and past experience.

2) List relevant projects with similar subsurface soil site conditions, dewatering depths, unwatering depths, construction techniques, and project durations.

3) Dewatering Specialist(s) may fulfill this role.

c. Drill Crew Foreman:

1) Resume verifying experience meeting qualifications with similar subsurface soil site conditions, dewatering depths, construction techniques, and project durations.

d. Geologist:

1) List background and past experience.

2) List relevant projects with similar subsurface soil site conditions, dewatering depths, construction techniques, and project durations.

3) Relevant experience with visual USCS logging.

E. RSN 31 03 33-4, Company Experience:

1. Project experience, include as a minimum for five (5) projects:

a. Name of Project.

b. Location of Project.

c. Description of dewatering system for each project.

d. Duration of dewatering system operation for each project.

F. RSN 31 03 33-5, Geologic Log Template:

1. Proposed template to be used for geologic logging.

2. Refer to Bureau of Reclamation Engineering Geology Field Manual, Second Edition, Volume I for example geologic logs. See Article 3.04.

G. RSN 31 03 33-6, Drill Records, Geologic Logs, Well Installations, and Reports:

1. Submit the following information for each deep well, supplementary deep well, temporary observation well, and supplementary temporary observation well:

Revised 31 03 33 - 11

a. Location by elevation and coordinates.

1) Measure ground elevation and top of casing.

b. Coordinate system (Northing and Easting for reference) and hole numbering system shown on drawings.

c. Hole depths.

d. Water-level and filter pack measurements at the beginning and end of the shift.

e. Caving conditions and cased intervals.

f. Types of drilling equipment used, including sizes and types of bits and barrels.

g. Rate of borehole advancement, changes in drilling rate, and depth of material changes.

h. Amount of casing, well screen, filter pack, and backfill installed.

i. Location (depth) of centering guides.

j. Depth to top of filter pack.

k. Well development and installation of pump.

1) Include turbidity (NTU) and sanding rates (ppm).

l. Other major factors affecting borehole advancement.

m. Dates of drilling, driller comments, and material descriptions (USCS), drill cuttings, problems during drilling, drill methods and reason for hole abandonment or termination (if applicable).

n. Section view drawing of the hole, showing the depth of material changes, hole size, location of casing, well screen, filter pack, centering guides, water loss zones, and how the hole was completed and developed.

H. RSN 31 03 33-7, Dewatering/Unwatering Reports:

1. Daily reports of operational, maintenance, and performance data including test results and records for work performed during that day.

a. Deleted.

b. Include routine testing results such as, but not limited to the following:

standby power testing, step tests, shutdown test, pumping test, and systems tests.

c. Include regular inspection reports of the dewatering and unwatering systems.

d. Average, maximum, and minimum pumping rate and flow for each pump in each system.

e. Turbidity measurement.

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1) Report in NTU’s or sanding rate, whichever method is used.

2) If a dewatering or unwatering system is not operational, mark “Not operational” and note the reason why.

f. Include depth to water and water level elevation in each deep well, temporary observation well, and in approved existing instrumentation.

1) Begin recording levels every four hours once the first deep well or temporary observation well is installed and operational.

g. Testing, maintenance, and calibration of equipment.

h. Microbiological testing and mitigation.

i. Summation of duration and timing of operation of the dewatering/unwatering systems, amount of water pumped, records of water level measurements, problems or unscheduled down time and the resolution thereof, and in general a discussion of unusual conditions or events that impacted dewatering/unwatering activities.

1) Include minutes from any dewatering-related meetings.

Meetings may occur more or less frequently, but minutes are to be submitted weekly.

2. Include weekly groundwater elevation contour map showing current ground water elevations.

I. RSN 31 03 33-8, Primary and Standby Power for Unwatering and Dewatering Systems:

1. Complete description of power systems.

2. Automatic transfer between primary and standby power system(s).

3. Pump starting sequence for soft restart.

4. Connection to utility meter.

5. Standby power: In accordance with Article 2.01 – Power Source.

J. RSN 31 03 33-9, Abandonment Plan for Deep Wells:

1. Include sequencing, methods, and material required to abandon the dewatering wells and supplementary dewatering wells.

K. RSN 31 03 33-10, Abandonment Plan for Temporary Observation Wells:

1. Include sequencing, methods, and materials required to abandon the temporary observation wells and temporary observation wells.

L. RSN 31 03 33-11, Abandonment Plan for Government Designed Unwatering Trench:

1. Include sequencing, methods, and materials required to abandon the Government Designed Dewatering Trench.

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1.05 QUALIFICATIONS

A. Drilling Superintendent/Dewatering Specialist(s):

1. Minimum 10 years of experience in dewatering projects.

B. Dewatering and Unwatering Specialist Assistant(s):

1. Competent employees selected by the Dewatering Specialist(s).

a. Qualified personnel shall have experience on a minimum of 5 similar dewatering jobs.

2. Shall communicate directly with dewatering specialist.

C. Drilling Company Experience:

1. Minimum of 10 years of experience in dewatering projects and at least 5 successful projects similar in nature to that required by this contract.

D. Dewatering Company Experience:

1. Minimum of 10 years of experience in dewatering projects and at least 5 successful projects similar in nature to that required by this contract.

1.06 GOVERNMENT RESPONSIBILITY

A. Government has designed the dewatering system, which is limited to well depth, intake depth, spacing, screen slots size, filter pack, screen length, blank casing length, and layout.

B. Government has designed the unwatering trench to be used on the left and right abutments. This unwatering is to be installed per the drawings and specifications. The Contractor may use this design for their unwatering system in other areas as applicable.

C. For offering purposes, assume excavation can begin after the defined “run time”. The Government will provide written notification to the Contractor once the run time has completed; the CO may provide written direction to the Contractor to begin excavation prior to the completion of the run time. The Government will have an “evaluation period” to evaluate the functionality of the completed and operating dewatering system(s) to determine if supplementary systems (or other methods) are needed. Use of supplementary systems, and other changes in the dewatering system to achieve adequate performance, shall be directed by the CO.

1. The 10-day evaluation period and 30-day run time will begin on the same day.

2. Direction of use of supplementary systems may occur prior to the evaluation period.

D. The Government reserves the right to evaluate the effectiveness of the unwatering system (Government designed and Contractor designed) at any time. If the COR determines that

Revised 31 03 33 - 14 water in the excavation is impacting the construction, the CO will request changes to the unwatering system(s) in writing. The CO may halt construction if water in the excavation continues to impact construction.

1.07 CONTRACTOR RESPONSIBILITY

A. For all unwatering aspects of the project, refer to Section 53 10 00 – Geologic Investigations for more information. Specifically, the Contractor unwatering system shall control and remove water due to the following:

1. Seepage water entering the excavation not intercepted by the dewatering system(s).

2. Surface runoff caused by possible seepage down the excavated dam face and abutments.

3. Surface runoff caused by precipitation.

4. Right and left abutment seepage is intended to primarily be taken care of by the Government designed unwatering and dewatering systems. The Contractor may need to control runoff or meteoric water.

B. Design, furnish, install, operate, maintain, and remove facilities, systems, and components required for unwatering including trenches, channels, ditches, gravel drains, gravel blankets, pipes, sumps, pumps, and discharge lines.

C. Furnish and install Government designed dewatering facilities according to Drawings and other specified requirements.

D. Material for the deep wells, temporary observation wells, and supplementary wells shall be onsite before drilling begins.

E. The Contractor shall not rotate, transfer, or otherwise replace dewatering specialist(s) and/or dewatering specialist assistant(s) without prior notification.

F. Contractor shall have a geologist on site while drilling

1. Geologist shall be competent in USCS soil logging.

G. Provide primary power for operation of dewatering and unwatering systems on a 24 hour, 7 days a week timeframe.

H. Provide a standby power system sufficient to power the dewatering and unwatering facilities in the event of a loss of primary.

I. Provide on-site standby equipment during times that dewatering and unwatering systems are operational.

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J. Design, furnish, install, operate, maintain, and remove facilities, systems, and components required for dewatering collection and discharge including piping systems, electrical supply, sediment control, and discharge lines.

K. Contractor shall control seepage from the perimeter of the excavation.

L. Design and install facilities to collect discharge water from dewatering and unwatering systems. Convey water to identified discharge areas in accordance with approved dewatering system plan.

M. Winterization of dewatering and unwatering system(s) and repair any damage due to lack of winterization of the systems.

N. Continuously operate dewatering system during construction to maintain stable slopes and facilitate excavation and backfilling operations. Unwater as necessary to remove surficial water.

O. Monitor and evaluate effectiveness of dewatering and unwatering systems on a continuous basis while systems are in operation.

P. Inhibit and remove microbiological growth and detritus from other processes that may reduce the effectiveness of the dewatering system(s) over time.

Q. Design, construct, and maintain sedimentation basin or basins to meet requirements of Section 01 57 30 – Water Pollution Control.

R. Provide required equipment and monitor water levels in deep wells and temporary observation wells, rates of discharge from dewatering and unwatering systems, and sediment content of the discharge.

S. The dewatering specialist’s and the dewatering specialist assistant(s)’ only responsibility shall be the installation, operation, maintenance, repair, and monitoring of the dewatering and unwatering systems.

T. Minimum Required Personnel:

1. Dewatering Specialist:

a. On site a minimum of 8 hours per day during dewatering system installation unless otherwise approved by the COR.

b. On site a minimum of 8 hours per day during the evaluation period unless deemed unnecessary by the COR.

c. On call 24 hours a day, 7 days a week, and able to reach the site within 36 hours when dewatering systems are in operation.

2. Dewatering Specialist Assistant(s):

a. Specifically trained and under supervision of the dewatering specialist.

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b. On site 24 hours a day, 7 days a week when dewatering systems are in operation.

c. Dewatering specialist can fulfill requirement.

3. Operation/maintenance personnel experienced in pump operation and maintenance.

a. On site 24 hours a day, 7 days a week when the dewatering system is in operation.

b. Dewatering specialist and/or dewatering specialist assistant(s) can fulfill requirement if qualified.

U. Supplementary Well Installation:

1. If written notification is provided by the Government to install supplementary deep wells or temporary observations wells, the Contractor shall begin installation within 7 days after receipt of notification. Time between the notice to install supplementary wells and the time drilling begins shall not count as drill rig standby time.

V. The Contractor shall notify the COR within 4 hours if a pump failure occurs.

W. Remove pumps and equipment from deep and temporary observation wells. Abandon wells in accordance with approved submittal(s).

X. Remove equipment and materials associated with the dewatering and unwatering systems from the site at the end of the project including related power systems.

Y. Damaged or destroyed dewatering and/or unwatering systems, or any component of those systems, resulting from construction activities and/or human error shall be repaired or replaced by the Contractor at the Contractor’s expense.

1.08 DEWATERING SEQUENCING

A. Contractor shall operate fully installed dewatering system for a minimum run time of 30 days prior to the beginning of excavation below El. 2535, unless directed otherwise in writing by CO.

1. The Vertical Sand Filter Trench may be constructed prior to the dewatering system being operational. Refer to Section 01 14 12 – Work Restrictions.

B. Government will evaluate effectiveness of unwatering and dewatering systems and provide direction to Contractor within the evaluation period of 10 calendar days.

C. Removal and control of water shall follow the following sequence:

1. Install temporary observation wells first.

a. Log and sample hole.

Revised 31 03 33 - 17

2. Install, develop, and operate deep wells.

a. Log and sample hole.

b. Deep wells on upstream limit of excavation may be installed, developed, and operated prior to completion of the initial excavation.

c. Begin removing water from deep wells in 5 well increments after each 5 well increment is installed.

3. Operate dewatering system for the run time duration.

a. During evaluation period, execute a planned, system-wide shutdown.

4. Drill, install, and develop the supplementary dewatering system and temporary observation wells, as directed by CO.

5. Excavate per approved plan.

6. Install approved Contractor designed unwatering system as needed during/after excavation.

7. Install Government designed unwatering trench as soon as practicable in order to control seepage from either abutment.

D. Install Government designed unwatering system as soon as practicable per the specifications and drawings.

E. The dewatering and unwatering systems are to remain operating continuously while the excavation is open during construction until backfill is complete to El. 2535, unless directed otherwise by the CO.

F. Abandon and remove dewatering and unwatering systems in accordance with approved submittal.

1.09 DELIVERY, STORAGE, AND HANDLING

A. Deliver, store and handle materials in accordance with manufacturers’ recommendations.

1.10 PROJECT CONDITIONS

A. Refer to Section 53 10 00 – Geologic Investigations.

B. Adequate unwatering, dewatering, and control of groundwater is critical to the following:

1. The stability of the excavation and safety of the workers.

2. Loss of unwatering and/or dewatering capability could result in substantial delays in completing excavation, and earth material placement activities.

3. Total loss of unwatering and/or dewatering capacity could result in excavation slope failure.

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C. The right abutment geology is anticipated to be variable in terms of water bearing units encountered. Deep wells DW-10 through DW-17 may require different slotted pipe lengths than what is shown on the drawings. The conditions encountered may require additional slotted pipe lengths, less blank pipe lengths, or a different combination of pipe lengths. Additional filter pack may also be required for these deep wells.

1. For offering purposes, use the lengths shown on the drawings.

2. The slot size and filter pack gradation are not expected to change.

D. Expected unwatering flows within excavation.

1. Expected Range: 0 to 100 GPM.

a. Additional inflow from precipitation may require additional capacity.

E. Expected unwatering flows within Government Designed Unwatering Ditches.

1. Expected Range: 0 to 50 GPM.

F. Conditions which may influence the dewatering and unwatering systems as well as the initial drawdown period may include:

1. Seepage through the excavation surfaces.

2. Frequency and rate of precipitation at the site.

3. Subsurface conditions including natural layering, thickness, permeability, and storativity of materials.

4. Initial groundwater levels.

5. Efficiency of dewatering systems, unwatering trenches, sumps, collectors, and discharge systems.

6. Reservoir levels.

G. Cold Weather Considerations:

1. If dewatering and unwatering systems are operated during cold weather, use winterization techniques and developing procedures. Dewatering and unwatering systems are not to be operated during winter shutdowns. Refer to Section 01 14 12 – Work Restrictions, Paragraph 1.02.H.

2. Pipes, sumps, pumps, and discharge lines capacity shall not be reduced due to frost and/or ice accumulation.

3. If the dewatering and unwatering system are not to be operated during winter, pumps and other systems may be removed at the Contractor’s discretion. Any items removed as a part of winterization must be reinstalled prior to restarting the system(s).

4. Protect dewatering wells and temporary observation wells from any debris falling into the well casing during winter shutdown.

Revised 31 03 33 - 19

a. Standard PVC caps may be used.

H. Refer to drawings for estimated well yield.

I. Not all water may be removed from highly permeable layers by dewatering systems.

Unwatering in conjunction with dewatering will be required to remove perched groundwater from permeable layers and will necessitate the use of open pumping techniques such as open trenches and sumps.

J. Materials within the portions of the excavation furthest from the dewatering…