140R6026R0004_-_Amendment_No__0005_0005.pdf

Amendment No. 0005 Solicitation No. 140R6026R0004

Description of Changes:

1. In Part I – The Schedule, remove specifications Section 00 00 10 – Table of Contents in its entirety and substitute therefor the attached revised Section 00 00 10.

2. In Part I – The Schedule, remove specifications 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, remove specifications Section 08 33 20 – Roll-up Door in its entirety and substitute therefor the attached revised Section 08 33 20.

4. In Part I – The Schedule, remove specifications Section 31 03 33 – Removal and Control of

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

5. In Part I – The Schedule, remove specifications Section 31 23 18 – Excavation of Deep Filter

Trench and Shoring and substitute therefor the attached revised Section 31 23 18.

6. In Part I – The Schedule, remove specifications Section 31 24 10 – Embankment, General in its entirety and substitute therefor the attached revised Section 31 24 10.

7. In Part I – The Schedule, remove specifications Section 31 32 36 – Jet Grouting in its entirety and substitute therefor the attached revised Section 31 32 36.

8. In Part I – The Schedule, remove specifications Section 33 46 36 – HDPE Pipe Drains in its entirety and substitute therefor the attached revised Section 33 46 36.

9. In Part I – The Schedule, remove specifications Section 51 00 60 – Geologic Reports in its entirety and substitute therefor the attached revised Section 51 00 60, which lists reports issued under Amendment No. 0002.

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

11. In Part I – The Schedule, in Section 52 00 00 – Drawings, remove the following drawings and substitute therefor the attached revised drawing:

Sheet No. Drawing No.

30 203-D-60032 – Revision 1

12. In Part IV – Representation and Instructions, remove Section L – Instructions, Conditions, and Notices to Bidders in its entirety and substitute therefor the attached revised Section L.

Solicitation No. 140R6026R0004

For convenience, essential changes on the revised solicitation pages are indicated by a vertical line within the margin, whereby the lines or paragraphs are changed from the previous version.

However, all portions of the revised solicitation pages shall apply whether changes thereon have been indicated or not.

Acknowledgement: See block 11 on the Standard Form 30 regarding acknowledgment by offerors to this amendment. The Government requires acknowledgment by offerors to this amendment at the place designated for receipt of proposals (Please see Block 19 on the Standard Form 1442.)

Receipt of Proposals: The hour and data for receipt of proposals is extended to 1700 MDT, on June 17, 2026.

Third Party: If you have provided a copy of this solicitation to another company or individual, please forward this amendment accordingly.

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

The Government will not acknowledge questions received after May 22, 2026.

Questions from Prospective Contractors Solicitation No. 140R6026R0004 – Heart Butte

Amendment No. 0005

42) Maintenance: Regarding the 24-hour maintenance on site while the dewatering systems are operational, are two personnel on site for safety reasons during nighttime hours required?

Additionally, can this maintenance be managed through 24-hour online equipment reporting in lieu of manpower?

Answer: No. Refer to specifications Section 013520, Paragraph 1.04 L. and specifications Section 310333, Paragraph 1.07 V.

43) Discharge: Are settlement tanks required? Is treatment required prior to discharge?

Answer: Refer to specifications Section 015730 – Water Pollution Control, Articles 1.05 and 1.06.

44) Power: Could you confirm if the primary power source from the utility company is 3-phase

480 V power, and what is the available amperage?

Answer: An existing buried 12.47kV line fed into a junction box is located near the northeast end of the Lake Tschida Campground, on the north side of the Heart Butte River, as shown on the Drawings. Verification of electrical equipment required for temporary electrical utility infrastructure, including but not limited to types, sizes, quantities, capacities, and sources is the responsibility of the Contractor. Refer to revised specifications Section 015100 – Temporary Utilities issued in Amendment No. 0002 and revised Drawing 203-D-60004 issued in Amendment 0003.

45) Flowmeter: Meters are to be installed on each well, is any flow testing required prior to turning system on?

Answer: Refer to specifications Section 310333, Paragraph 3.14 for equipment calibration requirements.

46) Logging of soils: Regarding the collection and storage of material collected from borings, will continuous coring be required? What are the sampling requirements, and is 100% recovery expected? Additionally, how are samples to be stored and what is procedure for this, will samples be stored in bags or boxes? Does the contractor have to save for any certain duration?

Answer: Refer to specifications Section 310333, Paragraph 3.04 for allowable drilling methods for deep wells and temporary observation wells and collection and storage of material collected from boreholes. Using fluid circulation (air or water) to remove cuttings is not permitted. Store material in Contractor use areas shown on Drawings for a minimum of 30 days and allow Government access to material retrieved from boreholes.

Material storage is at the discretion of the Contractor.

47) Well development:

a) Can an Imhoff cone be used in place of a sand Rossum tester. The dewatering wells are designed to shut on and off. As the wells do so the surging of water will cause small particles to enter the casing and possibly cause a false negative with respect to development.

Answer: No.

b) Where is development water to be discharged to? Can well development water be placed on ground.

Answer: Refer to specifications Section 015730 – Water Pollution Control, Articles

1.05 and 1.06.

c) Could you clarify if there is a time limit or minimum duration required for development.

Answer: Develop well following ASTM D5521 until discharge is less than 5 parts per million (ppm) sand content as measured by a Rossum Sand Tester or equivalent and is less than 15 NTU as measured by a calibrated field turbidity meter.

d) Based on the government-provided design, how often should contractor expect to redevelopment or pump material acculated in the bottom of the well?

Answer: Redevelopment and material accumulation rates will not be provided.

Refer to specifications Section 310333, Paragraph 3.12 A.

48) Well Design - Would bentonite chips be acceptable for use instead of pellets?

Answer: Bentonite chips are not allowed. Refer to revised specifications Section 310333

- Removal and Control of Water and revised drawing 203-D-60032 for allowable backfill materials.

49) Iron Bacteria- If wells start to show bacteria, how will contractor be compensated for well redevelopment / treatment of wells.

Answer: Refer to specifications Section 310333, Paragraphs 2.13 and 3.09 for microbiological control requirements and specification Section 510035 for well profile analysis. Section 310333, Paragraph 1.01 E. - Deep Wells Operation payment includes labor and equipment required to operate and maintain the deep wells.

Amendment No. 0005

50) Materials - Dewatering - With the dewatering in the 4 phases being possibly done as late as

2029, how does the owner want dewatering materials procured? Can materials be bought up front and billed for? If so, would purchase of materials be allowed to be stored at the contractors yard and show photos as proof of receipt? If materials are not bought up front, what mechanism allows for material escalation to be captured?

Answer: Refer to Section I – Contract Clauses, FAR Clause 52.232-5 – Payments Under Fixed-Price Construction Contracts, Paragraph (b)(2) and 52.216-4 – Economic Price Adjustment – Labor and Materials.

51) Will you please change the price schedule for option c – Care of reservoir releases during construction from Lump Sum to by the each? If the USBR cannot provide the information as to when and how many times during construction that the releases will take place, how can any contractor bid the items responsibly?

Answer: The CLINs in Optional Price Schedule C are included in the event of a large reservoir inflow event and impending spillway release during work within the conduit and spillway channel. Each of the Optional Price Schedule C CLINs are considered a one-time occurrence. Refer to specifications Section 310310 - Care of Reservoir Releases During Construction.

52) The temporary housing CLIN item is set up for 30 months. However, the specification states that the housing shall be in place before beginning work. The period of performance is 42 months. Please advise.

Answer: See revised specifications Section 01 14 12 - Work Restrictions.

53) Chemical grouting is set up for Lump Sum. Can USBR provide a maximum quantity of chemical grout such as the backfill grouting? Contractors would be taking on a large risk with grout loss without a maximum quantity.

Answer: A maximum quantity of chemical grout will not be provided. Refer to the informational drawings listed in specifications Section 520000 - Drawings and photographs within the conduit in specifications Section 510095 - Photographs.

54) Will a temporary septic system or well be acceptable for the Government housing?

Answer: No. Refer to specifications Section 01 52 20 – Temporary Housing.

55) For aggregates/soil placement, will a nuclear density gauge be allowed vs sand cone testing?

Significant delays could occur with awaiting results on the sand cones.

Answer: Nuclear Method (ASTM D6938) and Sand Cone (ASTM D1556) are both required as described in specifications Section 312302, Table 312302A - Contractor Materials Testing and Frequency. Sand cone testing is required for placement of Zone 3

Filter Sand Material at a minimum of one test per 500 yd3 compacted in place or when compaction methods change. No sand cone testing is required in the deep filter trench.

Sand cone testing is required for placement of Zone 5 Stability Berm Fill at a minimum of one test per 1000 yd3 compacted in place or when compaction methods change. Refer to specifications Section 312302 – Compacting Earth Materials.

56) Clin # 58 – 12-inch diameter HDPE pipe test section and camera – The specs states that the camera shall be capable of accessing pipe installed on a 0.44 slope. Is there some punctuation missing for the unit or does this represent a 44% slope?

Answer: Refer to revised specifications Section 334636, Paragraph 2.04 A.2.

57) Can you confirm that the dewatering specialist must be onsite 24 hours a day. If so, the dewatering subcontractor must have 2 working 12 hours or 3 working 8 hours a day for better part of 3 years. Could operations and maintenance personnel work in lieu of dewatering specialist as long as specialist is available to be onsite within 2 hours. Reasoning behind question is to have other be onsite monitoring system at night and weekends, with the specialist being in town and available 24/7.

Answer: Refer to specifications Section 310333, Paragraph 1.07 V. for minimum personnel requirements. The Dewatering Specialist(s) and Dewatering Specialist Assistant(s) shall meet the qualifications described in specifications Section 310333, Paragraph 1.05.

58) Upon dewatering being installed you have a 30-day evaluation period. That we can account for with crew and equipment. The issue I think I see is how do you account for payment once the supplemental wells are installed. Are you adding the 30-day evaluation time into the LF for the supplemental wells. If you do, then both drilling and supplemental wells must carry a 30-day evaluation for something that could be substantially less. Does the owner want to carry a day rate for evaluation periods?

Answer: Payment for the supplementary dewatering system will be in accordance with the CLINs detailed in Optional Price Schedules D through G if supplementary deep wells and/or supplementary temporary observation wells are directed by CO. Payment for operation of the (primary) deep wells is CLIN 1-25 in the Price Schedule and is measured in months. See applicable contract clause(s) in Section H for discussion of variation in the estimated quantity of unit-priced items.

59) Is air allowed to be used while installing the “soil reinforcement zone”?

Amendment No. 0005

60) Is the soil reinforcement zone required to be installed prior to the jet grout test sections or only the jet grout production work?

Answer: No. Jet grouting test sections may be installed prior to or concurrent with installation of the soil reinforcement zone. Refer to revised specifications Section 011412

- Work Restrictions.

61) The instructions to submit via Kiteworks sound like we have a limited amount of time to upload all of our proposal documents. Can the Bureau please clarify how long the link will be open for us to submit our items? Ie, will we be able to upload the volumes over the course of several days?

Answer: Kiteworks links are active for 14-calendar days.

62) Section L-14 (e) says we can submit either via email or Kiteworks. In the event that Kiteworks has technical difficulties when submitting our final volumes, can the Bureau please confirm it is acceptable to email our volumes to the Contracting Officer (Mitchell Frost) instead?

Answer: Yes.

63) Please confirm the Bid Guarantee is its own, additional volume (Volume 5 is not listed on page L-13 but is on page L-27), and that there is no page limit to this volume. Please confirm that the Bid Guarantee does not need to be hand delivered.

Answer: See revised Section L - Instructions, Conditions, and Notices to Bidders.

64) Please confirm that an 11x17 page counts as 1 (one) page.

Answer: Yes.

65) The email sent to bidders alerting us of Amendment 4 states the new time that bids are due as 2pm MT. The Amendment 4 document says bids are due at 5pm MT. Can you please confirm bids are indeed due at 5pm MT on June 10?

Receipt of proposals has been extended to June 17, 2026, by 1700 MDT.

66) Are the dewatering systems to remain in place between work seasons/phases?

Answer: Refer to specifications Section 310333, Paragraphs 1.08 F. and 1.10. E, and specifications Section 312410, Paragraph 3.05 B. Retain and protect deep wells from previous phases for operation during subsequent phases, as determined by COR. If dewatering and unwatering systems are operated during cold weather, use winterization techniques and development procedures. 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). During winter shutdown, protect earthfill zones placed from erosion, saturation, and contamination.

67) If the complete systems are not to stay in place what removal, care, and/or securement of different dewatering system components, e.g., pumps, discharge pipe, electrical, wells, is to be done between work seasons/phases?

Answer: Refer to the response to Question 66.

68) Are the 15 calendar days of operation before further excavating below 2010.0 in Phase III and Phase IV a part of/concurrent with the 30-day pre excavation run time period?

Answer: No. The Phase III and Phase IV 30-day run times are not concurrent with the 15-calendar days of operation before further excavating below elevation 2010.0. Refer to specifications Section 310333, Paragraphs 1.08 D. and E. 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.

69) Specification 31 03 33 - 22, Section 1.10, Subsection H, Number 1 states "Visible flowing seepage into the deep filter trench excavation is not acceptable." Does this include water that is being controlled through french drains / trenches to a sump pump or is it just referring to uncontrolled water in the bottom of the excavation that is not being actively sumped?

Subsection H indicates an understanding that the dewatering systems may not capture all of the water before it enters the trench and sumping will be necessary, but Number 1 confuses this matter by seemingly preventing the sumping of the remaining water.

Answer: Yes, we will allow water controlled through unwatering elements as decribed.

Refer to revised specifications Section 310333 - Removal and Control of Water and Section 312318 - Excavation of Deep Filter Trench and Shoring.

70) If the dewatering system is intended to remain in place between work phases, is the system intended to be operated for that duration as well?

Answer: Refer to the response to Question 66.

71) The specification (31 32 36 1.04.L) requires the Contractor to provide Core Box Storage Facility. Please clarify how long the storage facility will remain onsite.

Answer: See revised specifications Sections 011412 - Work Restrictions and 313236 - Jet Grouting.

Amendment No. 0005

72) Specs (31 32 36 3.13.7.b) state "Upon completion of core drilling, core logging will be performed by the Government." Please confirm that the Government will be logging the verification Cores, taking core runs photos and preparing a core log and the contractor is not required to prepare a log.

Answer: Refer to specifications Section 313236, Paragraph 3.13 F. for verification coring requirements. Photograph each core run, record survey coordinates for each coring location, place core in core box and clearly label with drill hole numbers and core sample depths. Core logging will be performed by the Government in accordance with specifications Section 313236, Paragraph 3.13 F.17.b.

73) The RFP documents do not include a geotechnical report nor boring logs and related lab tests. Please provide the available geotechnical information.

Answer: Refer to new specifications Section 510060 – Geologic Reports. Additional reports are available for viewing as listed in specifications Section 531000 - Geological Investigations, Paragraph 1.01 A.3. The following reports were included Amendment No. 0002:

• TM No. 8530-2018-54: Results of Soil Testing on Heart Butte Dam Conduit Material.

• GLFS TM No. 8550-2024-25: Heart Butte Dam Final Design Borrow Soil Investigation.

• TM No. 8550-2020-06: Geotechnical Laboratory Testing Results for Heart Butte Dam Conduit Floor, Foundation, Borrow, and Rock Material.

• Heart Butte Dam, North Dakota, 2024 Final Design Geologic Investigations.

• GLFS TM No. 8550-2025-02: Heart Butte Dam Geotechnical Laboratory Testing in Support of Final Design Modifications.

74) (31 32 36 3.01.E) Please confirm if air at minimum pressure/flow can be used during jet grouting operations. If possible please provide the maximum allowed air pressure and flow.

Answer: No air use will be allowed.

75) The Roll-up door specification (08 33 20 2.02 A. 15.) requires 120 VAC power for the motor.

Where is the location of tie in for the electrical?

Answer: Refer to revised specifications Section 083320 - Roll-Up Door.

76) Section L-16 (2) SF 1442 specifies that the executed form from Section A should be used as the first page of Volume 1. Can the Bureau please specify if this page should be placed at the beginning of Volume 1, in the SF 1442 Section 2, or elsewhere in the volume?

Answer: The executed Section A form may be included in the beginning of Volume 1.

Amendment No. 0005

77) Section L-16 (2c) states that Section I- Contract Clauses should be included in this section.

Due to the length of this section and to provide a more succinct and streamlined review for the Bureau, may this Section I be omitted from Volume 1?

Answer: Yes. Section I may be omitted from Vol 1.

78) Section L-21, Factor 1B, bullets 4a and 4b specify that each “…shall not exceed 2 pages as defined in Part C of this provision.” We do not see a Part C specifying particular page counts by section. Can the Bureau please confirm whether this should be disregarded or if there are any particular page counts per item requested?

79) We respectfully request that the bid date be pushed 14 days from 6/10 to 6/24.

Answer: Receipt of proposals has been extended to June 17, 2026, by 1700 MDT.

80) We anticipate further development of critical questions arising after 5/22, especially with some of them not being answered as of 5/22. Will you consider also pushing the question deadline 14 days to 6/5?

81) We understand that jet erosion tests based on ASTM D5852 were performed on sandstone specimens from Borehole DH-18-2, and determined that the erodibility classifications to be “erodible” to “moderately resistant”

ASTM D5852 is typically used to evaluate the soil/rock erodibility over time, such as “A test timing sequence of 600, 1200, 1800, and 3600 seconds intervals is recommended for a total testing time of 7200 s.” However, because of the extended timing of the jet erosion test, this is typically not reproducible in actual field jet-grouting applications; therefore, ASTM D5852 is not used in the jet-grouting industry.

We reviewed the site boring logs in the jet grouting zones, and understands that the sandstone was classified as clayey sand (SC) with the clay contents above 9% and the natural moisture contents below its plastic limits and described as “hard” and “very stiff”. In the jet grouting industry, very stiff to hard clay is considered non-jet-groutable material.

From the rock properties point of view, the sandstone in the jet grouting zone is considered as uncemented rock, H6 and H7 rock hardness/strength. From the soil properties point of view, this sandstone is considered as very stiff to hard clays with typical shear strength in a range of 2000~4000 psf. Jet grouting cannot treat such very stiff to hard clays.

Jet Grout Specification Section 31 32 36, Paragraph 3.05.P. states that, subject to the results of the test program, modifications may be required, and the Contractor may be required to repeat the construction of the test section, at no cost to the Government. Please consider revising to “at the cost of the Government, if it is determined that the subsurface material is non-jet-groutable.”

Answer: Refer to revised specifications Section 313236 - Jet Grouting.

82) Jet Grout Specification Section 31 32 36, Paragraph 3.08.A.3.a.1, defines the degree of cementation using rock hardness/strength criteria and states that “rock that can be grooved or gouged easily by knife or sharp pick with light pressure, can be scratched with a fingernail, or breaks with light to moderate manual pressure will be treated as uncemented. Refer to H6 and H7 rock hardness/strength descriptions.”

The referenced hardness/strength criteria do not necessarily correlate with whether a material is practically jet-groutable or non-jet-groutable. As currently written, the specification places significant performance risk on the contractor for subsurface conditions that may not be achievable based solely on the defined distinction between cemented and uncemented material.

Please consider revising or removing this requirement and instead provide criteria defining erodible versus non-erodible soils/materials that are more directly applicable to jet grouting performance and constructability.

Answer: Refer to revised specifications Section 313236 - Jet Grouting.

83) Amendment 4 indicates that an Excel spreadsheet of the Section B Price Schedule has been provided. However, I am not seeing that file available in SAM. Please provide this document.

Answer: The excel spreadsheet will be provided with Amend 5.

84) The specifications state that a transformer will be mounted on a pad when the contractor arrives on site. Note 8 on page 4 states the anticipated location of the temporary transformer.

Is the contractor to assume that we will need to route and install overhead/underground electric lines from this location @ Control Point #9?

Answer: Refer to revised specifications Section 015100 included with Amendment 0002 and revised Drawing 203-D-60004 included with Amendment 0003. Temporary Electrical Utility Infrastructure is the responsibility of the Contractor and is included as CLIN 1-1a in the revised Price Schedule in Amendment 0003.

Amendment No. 0005

85) Once the preliminary project information was released by the government’s contractor had conversations with jet grouting firms and expressed the concern that jet grouting treatment of the sandstone for a continuous cut-off wall as required by the specifications cannot be guaranteed.

Is the government able to revise Section M of the solicitation from Alternate I clause the Alternate II in order to evaluate and ask questions about Alternative Technical Concepts?

Heart Butte Dam Safety of Dams Modification Amendment No. 0005

Table of Contents

Revised - 00 00 10-1

SECTION C - DESCRIPTION / SPECIFICATIONS

TABLE OF CONTENTS

DIVISION 01 - GENERAL REQUIREMENTS

01 11 00 Summary of Work 01 14 10 Use of Site 01 14 12 Work Restrictions 01 14 20 Reservoir Operations 01 31 19 Project Management and Coordination 01 31 35 Onsite Video System 01 32 10 Construction Program 01 33 00 Submittals 01 35 10 Safety Data Sheets 01 35 20 Safety and Health 01 35 30 Contractor’s Onsite Safety Personnel 01 35 50 Security 01 42 10 Reference Standards 01 46 00 Quality Procedures 01 46 20 Testing Agency Services 01 46 25 Third Party Quality Control Inspections 01 51 00 Temporary Utilities 01 52 10 Government Field Office 01 52 20 Temporary Housing 01 55 00 Vehicular Access and Parking 01 55 20 Traffic Control 01 56 10 Protection of Existing Spillway Conduit and Stilling Basin 01 56 12 Protection of Existing Infrastructure 01 56 20 Existing Fences 01 57 20 Environmental Protection 01 57 30 Water Pollution Control 01 57 50 Tree and Plant Protection 01 60 00 Product Requirements 01 71 20 Surveying 01 74 00 Cleaning and Waste Management 01 78 30 Project Record Documents

DIVISION 02 - EXISTING CONDITIONS

02 07 10 Fishing Platform, Access Ramp, and Sidewalks

DIVISION 03 - CONCRETE

03 11 10 Concrete Forming

Revised - 00 00 10-2

03 15 12 PVC Waterstop 03 20 00 Concrete Reinforcing 03 20 30 Post-Installed Adhesive Anchors 03 30 00 Cast-In-Place Concrete 03 64 00 Backfill Grouting 03 81 10 Concrete Demolition and Removal 03 81 17 Chemical Grout Repair

DIVISION 05 - METALS

05 50 00 Metal Fabrications

DIVISION 08 - OPENINGS

08 33 20 Roll-Up Door

DIVISION 31 - EARTHWORK

31 02 10 Dust Abatement 31 03 10 Care of Reservoir Releases During Construction 31 03 20 Cofferdam Construction and Temporary Channel Crossing 31 03 33 Removal and Control of Water 31 09 10 Abandoning and Removing Existing Instrumentation 31 09 12 New and Temporary Embankment Measurement Points 31 09 20 New Piezometers 31 09 30 Seepage Measurement Instrumentation 31 11 00 Clearing and Grubbing 31 14 10 Stripping 31 23 02 Compacting Earth Materials 31 23 16 Excavation 31 23 18 Excavation of Deep Filter Trench and Shoring 31 23 19 Use of Borrow Area 31 23 39 Disposal of Excavated Materials 31 23 70 Controlled Low Strength Material 31 24 10 Embankment, General 31 24 12 Zone 3 - Filter Sand Material 31 24 13 Zone 4 - Gravel Drain Material 31 24 14 Zone 5 - Stability Berm Fill 31 24 15 Zone 6 - Reinforced Backfill Material 31 32 32 Geotextile 31 32 36 Jet Grouting 31 37 01 Riprap 31 37 02 Riprap Bedding 31 37 10 Rockfill Slope Protection

DIVISION 32 - EXTERIOR IMPROVEMENTS

Revised - 00 00 10-3

32 15 10 Gravel Surfacing 32 31 10 Chain Link Fence 32 32 24 Mechanically Stabilized Earth Walls 32 91 10 Topsoil 32 91 60 Topsoil Erosion Control Matting 32 92 20 Restoration and Revegetation

DIVISION 33 - UTILITIES

33 46 36 HDPE Pipe Drains

DIVISION 51 - INFORMATION AVAILABLE TO OFFERORS

51 00 00 Information Available to Offerors 51 00 05 DOI Security Forms 51 00 10 Climatological Data 51 00 20 Historic Reservoir Elevations 51 00 30 Historic Unwatering for Stilling Basin Inspections 51 00 35 Well Profile Analysis 51 00 40 Evaluation of Potential Filter Sand and Gravel Drain Sources 51 00 45 Friable Particle Count Method 51 00 50 Instrumentation Data 51 00 55 Spillway and Outlet Works Discharge and Tailwater Elevation Data 51 00 60 Geologic Reports 51 00 80 USBR Guidelines for Earthwork Construction Control Testing of Gravelly Soils 51 00 85 Lake Tschida Water Test Results 51 00 90 Environmental Assessment 51 00 95 Photographs

DIVISION 52 - DRAWINGS

52 00 00 Drawings

DIVISION 53 - GEOLOGIC INVESTIGATIONS AND RECORDS

53 10 00 Geologic Investigations 53 20 00 Records of Geologic and Subsurface Investigations

END OF CONTENTS

Revised - 00 00 10-4

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Work Restrictions

Revised - 01 14 12 - 1

SECTION 01 14 12

WORK RESTRICTIONS

PART 1 GENERAL

MEASUREMENT AND PAYMENT

A. Cost:

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

1.02 WORK RESTRICTIONS

A. Lake Tschida Downstream Campground as shown on the Drawings will remain closed throughout construction operations. The campground and facilities may be used during construction in coordination with the campground manager according to 01 14 10 – Use of Site.

B. Public shall be allowed access to Heart Butte Reservoir and its recreation areas throughout construction. Public access below the dam and within all work areas is closed to the public throughout construction operations.

C. If the dam crest road is used as part of the construction haul route, the maximum weight of the fully loaded construction vehicles traveling on the dam crest road shall be restricted according to North Dakota Department of Transportation’s (NDDOT) rating and requirements for State Highway 49. Refer to Section 01 55 00 – Vehicular Access and Parking.

D. 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.

E. Road Closures:

1. If needed, limit temporary road closures to between 9:00 am to 4:00 pm and each shall not exceed 30 minutes.

F. Minimum volumes of Zone 3 - Filter Sand Material shall be placed in stockpiles on site before beginning deep filter trench excavation and spillway channel excavation.

Minimum volumes of Zone 3 are as follows:

1. Before beginning deep filter trench excavation:

a. Zone 3: 550 cy

2. Before beginning spillway channel excavation:

a. Zone 3: 440 cy

G. Allowable Work Hours: 24 hours a day, Monday through Saturday.

Revised - 01 14 12 - 2

H. Complete temporary electrical utility infrastructure installation in the first construction season.

I. The Contractor-designed soil reinforcement zone shall be constructed prior to construction of the production jet grouting treatment zone. Jet grouting test sections may be installed prior to or concurrent with installation of the soil reinforcement zone.

J. Construction of jet grouting treatment zone shall proceed after jet grouting test sections and Test Sections Report are completed and the Final Jet Grouting Treatment Plan is approved by the Government.

K. The jet grouting treatment zone on both sides of the conduit between spillway station 11+96 and 12+48 shall be constructed prior to drilling and installing the Phase I dewatering wells. Drilling the Phase I dewatering wells shall begin at least 7 days after the jet grouting treatment zone are completed.

L. Complete backfill grouting operations in the first construction season after operational releases are complete and prior to initiating jet grouting operations. The Government will perform normal reservoir operations during the first construction season and make outlet works releases until approximately the end of October. The Government is expected to stop outlet works releases on October 31st of the first construction season to allow the Contractor to proceed with the backfill grouting operation inside the conduit. The Contractor shall complete the backfill grouting operation by December 30th of the first construction season.

1. The jet grouting test sections and jet grouting treatment zone along the right side of the spillway chute between jet grouting treatment control points 902 and 904 (see Drawing 203-D-60019) are excluded from this restriction.

M. The construction schedule of jet grouting treatment zone installation inside the conduit shall be approved by COR after the jet grouting test sections are completed and deemed acceptable. Installation of the jet grouting treatment zone beneath the conduit shall be ready to proceed on August 1st of the second construction season and shall meet the following criteria:

1. The Government has completed reservoir draw down to the reduced pool elevation.

2. Approved, Contractor-designed unwatering system including unwatering of the spillway stilling basin shall be installed following reservoir drawdown and conclusion of outlet works releases.

3. Phase I dewatering wells shall be installed and groundwater level lowered to a minimum El. 1995 in the footprint of jet grouting treatment zone beneath the conduit. Refer to Section 31 03 33 – Removal and Control of Water for requirements.

N. Jet grouting treatment zone beneath the conduit shall be installed, verified, and approved by November 1st in the second construction season.

Revised - 01 14 12 - 3

O. The Contractor-designed temporary conduit shoring system shall be installed before demolition of the conduit floor and side walls occurs. The temporary conduit shoring system shall be designed to sustain 600 cubic feet per second (cfs) of discharge flow in the conduit. Refer to Section 03 11 10 – Concrete Forming and Section 05 50 00 – Metal Fabrications.

P. After the jet grouting treatment zone beneath the conduit is installed and approved, conduit demolition and repair shall begin on November 1st and shall be completed by January 15th when the probability for uncontrolled spillway releases is at lowest level according to the historical inflow data (work may be released earlier than November 1st dependent upon interior jet grouting completion). Operation of the approved, Contractor-designed unwatering system including unwatering of the spillway stilling basin shall continue during conduit demolition and repair.

Q. The Government will monitor the reservoir level and inflow conditions during construction activities within the conduit or spillway channel. If reservoir water level rises and uncontrolled spillway release becomes likely, the Contracting Officer will inform the Contractor at least 10 days before the expected spillway release. Refer to Section 31 03 10 – Care of Reservoir Releases during Construction.

R. Excavation and installation of Zone 3 - Filter Sand Material, riprap bedding and riprap in the spillway discharge channel at the end of the stilling basin shall be performed after reservoir draw down is complete in either the second or the third construction season. At the same time, the stilling basin shall be completely unwatered. Refer to Section 01 14 20 – Reservoir Operations and Section 31 03 33 – Removal and Control of Water.

S. The spillway channel excavation and remediation shall not begin until jet grouting operations outside the conduit are complete and the jet grouting treatment zone achieves the specified compressive strength.

T. Place compacted fill to a minimum depth of 5 feet above top of the conduit before allowing any construction equipment and vehicle travel across the top of the conduit.

Refer to Section 01 56 10 – Protection of Existing Spillway Conduit and Stilling Basin for requirements.

U. After installation of the jet grouting treatment zone beneath the conduit is completed, construction equipment and vehicle travel over the conduit is not permitted until the conduit repair has been completed and concrete achieves the specified compressive strength.

V. The deep filter trench excavation and shoring shall not begin until all jet grouting operations are completed and accepted.

W. Phase III dewatering system and approved, Contractor-designed unwatering system including unwatering of the spillway stilling basin shall be installed prior to beginning deep filter trench excavation. Groundwater levels shall be monitored prior to beginning deep filter trench excavation. Refer to Section 31 03 33 – Removal and Control of Water and Section 31 23 18 – Excavation of Deep Filter Trench and Shoring for requirements.

Revised - 01 14 12 - 4

X. Construction of the blanket filter and drainage system shall not begin until deep filter trench excavation and backfill is complete.

Y. Phase IV dewatering system and approved, Contractor-designed unwatering system including unwatering of the spillway stilling basin shall be installed prior to beginning excavation for the blanket filter and shallow filter trench within the relic river channel area. Groundwater levels shall be monitored prior to beginning excavation for the blanket filter and shallow filter trench. Refer to Section 31 03 33 – Removal and Control of Water for requirements.

Z. Place a minimum five feet (unless shown otherwise on Drawings) of fill over the completed blanket filter and drainage system by the end of the third construction season, not including sacrificial earthfill material for winter shutdown.

AA. Chemical grout repair shall be completed by the end of the third construction season.

BB. The trees on the property of the Lake Tschida campground shall be protected during construction.

CC. Provide government housing from May 1st, 2027, through October 31st, 2029.

DD. Provide storage facility for jet grouting verification core boxes beginning before installation of jet grouting test sections and ending after approval of the Final Jet Grouting Report.

EE. Restoration and Revegetation (see Section 32 92 20) shall occur beginning April 1st, 2030, and complete by June 11th, 2030.

PART 2 PRODUCTS

Not Used

PART 3 EXECUTION

Not Used

END OF SECTION

Roll-Up Door

Revised - 08 33 20 - 1

SECTION 08 33 20

ROLL-UP DOOR

PART 1 GENERAL

1.01 MEASUREMENT AND PAYMENT

A. Roll-up Door:

1. Payment: Lump-sum price offered in the Price Schedule.

1.02 REFERENCE STANDARDS

A. ASTM International (ASTM)

1. ASTM A653/A653M-08 Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy Coated (Galvannealed) by the Hot-Dip Process

1.03 SUBMITTALS

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

B. RSN 08 33 20-1, Approval Drawings and Data:

1. Shop drawings:

a. Show dimensions, materials, relationship to structure, mounting, electrical, anchorage, and other fabrication and installation details.

b. Identify door by Government designations on Drawings.

2. Manufacturer’s product data:

a. Include complete descriptions and specifications for materials, construction, features, and finishes.

3. Manufacturer’s standard color chart for color selection.

4. Manufacturer’s certification that doors meet specified performance requirements.

5. Manufacturer’s storage, handling, installation, and maintenance instructions.

6. Schematic and wiring diagrams.

C. RSN 08 33 20-2, Instructions:

1. Manufacturer’s storage, handling, installation, and maintenance instructions.

D. RSN 08 33 20-3, Extra Materials:

1. Spare parts as listed in Article 1.05.

Revised - 08 33 20 - 2

1.04 DELIVERY, STORAGE, AND HANDLING

A. Store and handle at jobsite in accordance with manufacturer’s instructions.

1.05 EXTRA MATERIALS

A. Furnish one complete set of replacement weatherstripping and seals.

PART 2 PRODUCTS

2.01 PERFORMANCE REQUIREMENTS

A. Windload: Provide doors capable of withstanding a 50 pounds per square foot horizontal windload without deformation or damage to door and components.

B. Operating Cycles: Provide doors designed for 100,000 cycles, minimum, for life of door.

2.02 ROLL-UP DOORS

A. Insulated Service Door manufactured by Cookson Company, 2417 S. 50th Avenue, Phoenix AZ 85043; or equal, having following essential characteristics:

1. Rolling insulated service door.

2. Door curtain constructed of interconnected strip steel slats.

3. 3-inch slat height.

4. Slats constructed of exterior and interior sheets of 18/24-gauge, minimum, galvanized sheet steel with ASTM A653, G90 zinc coating.

5. Slat sheets separated by 13/16-inch-thick rigid insulation.

6. Bottom bar consisting of two 1/8-inch-thick steel angles mechanically joined together with continuous 1-inch diameter, vinyl-covered foam edge astragal.

7. Door guides consisting of three steel angles bolted together to form curtain channel.

8. Snap-on continuous extruded vinyl weatherstripping on exterior leg of each door guide.

9. 1/4-inch-thick steel mounting brackets bolted to wall angle of door guides.

10. 6-inch diameter steel tubing barrel coated with rust-inhibiting prime paint.

11. Barrel designed to limit deflection to 0.03-inch maximum deflection per foot of opening width.

12. Oil tempered torsion springs capable of counterbalancing door curtain.

13. Springs adjustable by exterior wheel.

14. Weather-proof, 24-gauge, minimum, galvanized steel hood with waterproof baffle to control air infiltration.

Revised - 08 33 20 - 3

15. Direct drive motor operator where indicated on door schedule:

a. Sized appropriately for the door operated.

b. Medium or Heavy duty, commercial grade operator.

c. Intended for side mount and outdoor/exterior installation, on the right or left side of the roll-up door. Verify layout and potential interferences at the installation location to determine the appropriate mounting location.

d. Soft stop and start.

e. Power: 120 VAC, 1-phase.

1) Provide lockable, NEMA 4 weatherproof power inlet box rated for 120V, 20A service at exterior side of door, readily accessible for portable generator connection.

2) Provide NEMA L5-20 plug unless otherwise specified by COR.

f. Overload protection.

g. NEMA 250 Type 4 enclosure.

h. 300,000 cycle rating.

i. Light curtain and sensing edge obstruction detection.

j. Allows motor to be disconnected and door to be manually operated from the exterior side with padlockable, chain hoist with weatherproof cover or by covered crank drive with removable crank and lockable crank box.

16. Operable by 30 pounds, maximum, effort.

17. Wall mounted to cast-in-place concrete with positive stop 12 to 18 inches above floor.

2.03 FINISH

A. Manufacturer’s standard thermosetting powder coating on door curtain, bottom bar, guides, brackets, and hood.

B. Coating Thickness: 2 mils, minimum.

PART 3 EXECUTION

3.01 INSTALLATION

A. Install in accordance with approved shop drawings and manufacturer’s instructions.

B. Install plumb and in alignment with adjacent work.

C. Securely anchor to concrete.

D. Test and adjust door operation for proper operation.

Revised - 08 33 20 - 4

E. Show manual operation of door works properly.

3.02 MAINTENANCE

A. Maintain doors in accordance with manufacturer’s instructions until acceptance of work by Government.

END OF SECTION

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. Contractor Designed Unwatering System:

1. Payment: Lump-sum price offered in the Price Schedule.

a. Includes the following:

1) Labor, primary power, standby power, automatic transfer between primary and standby power system(s), materials, equipment, and other items needed to furnish, install, operate, and maintain an effective unwatering system.

2) Sediment basin or other method(s) to remove suspended particles.

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

4) Route and control any water leakage past the outlet works regulating gate or existing seepage into the conduit.

5) Route and control nuisance water leakage from any excavations below the original groundwater level.

6) Removal and abandonment of the Contractor Designed Unwatering System.

B. Temporary Observation Wells Installation/Removal:

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

2. Payment: Linear foot price offered in the Price Schedule.

a. Includes the following:

1) Furnishment and installation of the materials required for the 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).

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

3) Drilling.

4) Removal and abandonment of temporary observation wells.

Revised - 31 03 33 - 2

C. Supplementary Temporary Observation Wells Materials:

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

2. Payment: Linear foot price offered in the Price Schedule.

a. Includes the following:

1) Furnishment of 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).

D. Deep Wells Installation/Removal:

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

2. Payment: Linear foot price offered in the Price Schedule.

a. Includes the following:

1) Furnishment and installation of 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, including standby time.

4) Operation and maintenance are included in Article 1.01.E, Deep Wells Operation.

5) Removal and abandonment of deep wells.

E. Deep Wells Operation:

1. Measurement: Time in months.

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

a. Includes the following:

1) Labor, primary power, standby power, automatic transfer between primary and standby power system(s), and other equipment required to operate and maintain the deep wells.

Revised - 31 03 33 - 3

2) Standby pumps for deep wells.

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

4) Deleted.

F. Supplementary Deep Wells Materials:

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

2. Payment: Linear foot price offered in the Price Schedule.

a. Includes the following:

1) Furnishment of the materials required for the supplementary 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.

G. 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: Linear foot price offered in the Optional Price Schedules for each phase:

a. Phase I - Supplementary Temporary Observation Wells Installation/Removal: Optional Price Schedule D

b. Phase II - Supplementary Temporary Observation Wells Installation/Removal: Optional Price Schedule E

c. Phase III - Supplementary Temporary Observation Wells Installation/Removal: Optional Price Schedule F

d. Phase IV - Supplementary Temporary Observation Wells Installation/Removal: Optional Price Schedule G

e. Includes the following:

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

2) Drilling.

3) Removal and abandonment of supplementary temporary observation wells.

Revised - 31 03 33 - 4

H. Supplementary Deep Wells Installation/Removal:

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

2. Payment: Linear foot price offered in the Optional Price Schedules for each phase:

a. Phase I - Supplementary Deep Wells Installation/Removal: Optional Price Schedule D

b. Phase II - Supplementary Deep Wells Installation/Removal: Optional Price Schedule E

c. Phase III - Supplementary Deep Wells Installation/Removal: Optional Price Schedule F

d. Phase IV - Supplementary Deep Wells Installation/Removal: Optional Price Schedule G

e. 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 Article 1.01.I, Supplementary Deep Wells Operation.

4) Removal and abandonment of supplementary deep wells.

5) Drill rig(s) standby time.

I. Supplementary Deep Wells Operation:

1. Measurement: Time in months.

2. Payment: Unit price offered in the Optional Price Schedules for each phase:

a. Phase I - Supplementary Deep Wells Operation: Optional Price Schedule D

b. Phase II - Supplementary Deep Wells Operation: Optional Price Schedule E

c. Phase III - Supplementary Deep Wells Operation: Optional Price Schedule F

d. Phase IV - Supplementary Deep Wells Operation: Optional Price Schedule G

e. Includes the following:

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

Revised - 31 03 33 - 5

1.02 REFERENCE STANDARDS

A. ASTM International (ASTM):

1. ASTM C150/C150M-24 Portland Cement

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

3. ASTM D2487-17(2025) Classification of Soils for Engineering Purposes (Unified Soil Classification System)

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

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

6. ASTM D5521/D5521M-18(2025) Development of Groundwater Monitoring Wells in Granular Aquifers

7. ASTM F480-14(2022) Thermoplastic Well Casing Pipe and Couplings Made in Standard Dimension Ratios (SDR), SCH 40 and SCH 80

B. Engineering Geology Field Manual, Second Edition, Volume I, 1998, U.S. Department of the Interior, Bureau of Reclamation