W912QR24R0048_FIO_V4c_Specs-0000.pdf

Solicitation For Rough River Dam Safety Modification Project Phase II - New Outlet Works and Cutoff Wall

P2: 145870

Design-Bid-Build

Specifications Vol. 4c (Div. 31 23 00-41)

For Information Only

23 September 2024

W912QR24R0048

ARIMS: 1200

Disposition: Permanent

W912QR24R0048_FIO_V4c_Specs-0000

145870 Rough River Dam For Information Only BCOES Review DSM Phase 2: New Outlet Works and Cutoff Wall

PROJECT TABLE OF CONTENTS

DIVISION 00 - PROCUREMENT AND CONTRACTING REQUIREMENTS

00 31 19.23 06 5/24 WEATHER AND WATER STAGE

DATA/RESTRICTIONS

00 31 31.13 06 08/24 SUBSURFACE INVESTIGATION INFORMATION

00 80 00.00 06 04/21, CHG 1: 06/23 SPECIAL PROVISIONS

DIVISION 01 - GENERAL REQUIREMENTS

01 11 00 5/24 SUMMARY OF WORK

01 31 00 08/24 DATA MANAGEMENT

01 32 01.00 06 10/23 PROJECT SCHEDULE

01 32 23 SURVEY CONTROL, LiDAR, ORTHOIMAGERY

AND BATHYMETRY

01 33 00 08/18, CHG 4: 02/21 SUBMITTAL PROCEDURES

01 33 16.00 08 8/24 CONTRACTOR SUBMITTALS REQUIRING

ENGINEERING AFTER AWARD

01 35 00.00 06 5/24 SPECIAL PROCEDURES

01 35 26.00 06 GOVERNMENT SAFETY REQUIREMENTS

01 42 00 02/24 SOURCES FOR REFERENCE PUBLICATIONS

01 45 00.15 10 11/23 RESIDENT MANAGEMENT SYSTEM CONTRACTOR

MODE (RMS CM)

01 45 04.10 06 CONTRACTOR QUALITY CONTROL

01 50 00 11/20, CHG 2: 08/22 TEMPORARY CONSTRUCTION FACILITIES AND

CONTROLS

01 52 13.20 06 05/2024 GOVERNMENT FACILITIES

01 52 13.30 08 08/24 LABORATORY TESTING FACILITIES

01 57 19.00 06 11/21 TEMPORARY ENVIRONMENTAL CONTROLS AND

PERMITS

01 74 19 02/19, CHG 3: 11/21 CONSTRUCTION WASTE MANAGEMENT AND

DISPOSAL

01 78 23 6/24 OPERATION AND MAINTENANCE DATA

DIVISION 02 - EXISTING CONDITIONS

02 32 00 5/24 ADDITIONAL INVESTIGATIONS

02 41 00 08/22 DEMOLITION

DIVISION 03 - CONCRETE

03 00 00 6/24 GENERAL CONCRETE REQUIREMENTS

03 15 00 11/21 BRIDGE CONCRETE ACCESSORIES

03 23 00 11/21 POST TENSIONED REINFORCING

03 30 00 02/19 CAST-IN-PLACE CONCRETE OUTLET WORKS

03 37 13 11/21 SHOTCRETE

03 37 29 11/21 CONCRETE FOR CUTOFF WALL

03 70 00 11/21 MASS CONCRETE

DIVISION 04 - MASONRY

04 20 00 08/21 UNIT MASONRY

DIVISION 05 - METALS

05 05 20 05/22 POST-INSTALLED CONCRETE ANCHORS

05 12 10 08/21 ELASTOMERIC BEARING PADS

05 12 23 08/21 GENERAL STRUCTURAL STEEL

PROJECT TABLE OF CONTENTS Page 1

05 12 33 08/21 STRUCTURAL STEEL BRIDGES

05 14 00.13 11/19 WELDING STRUCTURAL ALUMINUM

05 21 00 05/21 STEEL JOIST FRAMING

05 30 00 08/21 STEEL DECKS

05 40 00 08/21 COLD-FORMED METAL FRAMING

05 50 13 08/21 MISCELLANEOUS METAL FABRICATIONS

05 50 15 08/21 CIVIL WORKS FABRICATIONS: GATE BONNETS

05 51 33 08/21 METAL LADDERS

05 52 00 08/21 METAL RAILINGS

05 59 20 11/21 FABRICATION OF HYDRAULIC STEEL

STRUCTURES

DIVISION 06 - WOOD, PLASTICS, AND COMPOSITES

06 10 00 08/21 ROUGH CARPENTRY

DIVISION 07 - THERMAL AND MOISTURE PROTECTION

07 21 13 02/21 BOARD AND BLOCK INSULATION

07 27 10.00 10 08/21 BUILDING AIR BARRIER SYSTEM

07 60 00 08/21 FLASHING AND SHEET METAL

07 61 14.00 20 08/21 STEEL STANDING SEAM ROOFING

07 81 00 02/21 SPRAY-APPLIED FIREPROOFING

07 84 00 05/21 FIRESTOPPING

07 92 00 08/21 JOINT SEALANTS

DIVISION 08 - OPENINGS

08 11 13 08/21 STEEL DOORS AND FRAMES

08 31 00 05/17, CHG 1: 08/18 ACCESS DOORS AND PANELS

08 33 23 08/21 OVERHEAD COILING DOORS

08 51 13 08/21 ALUMINUM WINDOWS

08 71 00 02/21 DOOR HARDWARE

08 81 00 05/21 GLAZING

08 91 00 08/21 METAL WALL LOUVERS

DIVISION 09 - FINISHES

09 22 00 02/21 SUPPORTS FOR PLASTER AND GYPSUM BOARD

09 29 00 08/21 GYPSUM BOARD

09 90 00 05/21 PAINTS AND COATINGS

09 97 02 02/21 PAINTING: HYDRAULIC STRUCTURES

DIVISION 10 - SPECIALTIES

10 14 00.10 08/21 EXTERIOR SIGNAGE

10 14 00.20 08/21 INTERIOR SIGNAGE

10 28 13 08/21 TOILET ACCESSORIES

10 44 16 08/21 FIRE EXTINGUISHERS

DIVISION 13 - SPECIAL CONSTRUCTION

13 34 19 11/21 METAL BUILDING SYSTEMS

DIVISION 14 - CONVEYING EQUIPMENT

14 21 13 05/21 ELECTRIC TRACTION FREIGHT ELEVATORS

DIVISION 22 - PLUMBING

PROJECT TABLE OF CONTENTS Page 2

22 14 29.00 40 05/21 SUMP PUMPS

DIVISION 23 - HEATING, VENTILATING, AND AIR CONDITIONING (HVAC)

23 30 00 05/20, CHG 1: 02/22 HVAC AIR DISTRIBUTION

23 82 00.00 20 02/16, CHG 1: 08/18 TERMINAL HEATING UNITS

23 83 00.00 20 04/06 ELECTRIC SPACE HEATING EQUIPMENT

DIVISION 26 - ELECTRICAL

26 00 00.00 20 07/21 BASIC ELECTRICAL MATERIALS AND METHODS

26 05 73 08/23 POWER SYSTEM STUDIES

26 08 00 11/22 APPARATUS INSPECTION AND TESTING

26 20 00 02/21 INTERIOR DISTRIBUTION SYSTEM

26 28 00.00 10 08/21 MOTOR CONTROL CENTERS AND PANELBOARDS

26 32 15.00 05/20 ENGINE-GENERATOR SET STATIONARY

15-2500 KW, WITH AUXILIARIES

26 36 00.00 10 08/21 AUTOMATIC TRANSFER SWITCH AND

BY-PASS/ISOLATION SWITCH

26 41 00 08/21 LIGHTNING PROTECTION SYSTEM

26 51 00 05/21 INTERIOR LIGHTING

26 56 00 05/21 EXTERIOR LIGHTING

DIVISION 28 - ELECTRONIC SAFETY AND SECURITY

28 31 70 08/21 INTERIOR FIRE ALARM SYSTEM, ADDRESSABLE

DIVISION 31 - EARTHWORK

31 00 00.00 06 5/24 EARTHWORK

31 05 22 11/21 NON-WOVEN GEOTEXTILE FILTER FABRIC

31 09 13.00 06 INSTRUMENTATION AND MONITORING

31 11 00 11/18 CLEARING AND GRUBBING

31 23 00.00 06 5/24 CONTROL OF WATER AND DEWATERING

31 23 05.00 06 09/21 MASS EXCAVATION

31 23 17.00 06 09/21 UNDERWATER BLASTING

31 23 18.00 06 09/21 BLASTING - SURFACE

31 32 23.00 06 6/24 SLURRY CONTROL DRILLING AND GROUTING

31 41 16 11/21 METAL SHEET PILING

31 56 10.00 06 5/24 CUTOFF WALL CONSTRUCTION

31 60 00.00 06 6/24 FOUNDATION PREPARATION

31 68 13 06/24 ROCK SLOPE REINFORCEMENT AND PERMANENT

ROCKFALL PROTECTION

31 71 16.00 06 09/21 ROCK TUNNELING

31 73 00 10/21 TUNNEL GROUTING

DIVISION 32 - EXTERIOR IMPROVEMENTS

32 01 00 10/13 MISCELLANEOUS CONSTRUCTION

32 01 19.61 11/19 SEALING OF JOINTS IN RIGID PAVEMENT

32 11 10 02/21 OPEN GRADED AGGREGATE FOR DRAINAGE

32 11 16.16 11/11 KYTC CRUSHED STONE BASE CONSTRUCTION

32 12 13 05/17 BITUMINOUS TACK AND PRIME COATS

32 12 16 11/21 HOT-MIX ASPHALT (HMA) FOR ROADS

32 16 19 05/18 CONCRETE CURBS, GUTTERS AND SIDEWALKS

32 17 23 08/16, CHG 5: 11/18 PAVEMENT MARKINGS

32 18 16.13 08/17 PLAYGROUND PROTECTIVE SURFACING

32 31 13 11/21 CHAIN LINK FENCES AND GATES

PROJECT TABLE OF CONTENTS Page 3

32 31 13.15 06 06/01 GUARDRAIL

32 91 18.00 06 04/21 HIGH PERFORMANCE TURF REINFORCED MAT

32 92 19 08/17, CHG 1: 08/21 SEEDING

32 92 23 04/06, CHG 1: 08/21 SODDING

DIVISION 33 - UTILITIES

33 01 30.16 11/21, CHG 1: 02/24 TV INSPECTION OF SEWER LINES

33 11 00 02/18, CHG 2: 11/23 WATER UTILITY DISTRIBUTION PIPING

33 30 00 05/18 SANITARY SEWERAGE

33 40 00 11/21 STORMWATER UTILITIES

33 46 13 03/24 FOUNDATION DRAINAGE SYSTEM

33 46 16 05/18 SUBDRAINAGE PIPING

33 71 01 05/19, CHG 1: 11/19 OVERHEAD TRANSMISSION AND DISTRIBUTION

33 71 02 02/15 UNDERGROUND ELECTRICAL DISTRIBUTION

DIVISION 35 - WATERWAY AND MARINE CONSTRUCTION

35 01 70.13 05/21 WIRE ROPE AND RIGGING FOR OPERATING

DEVICES

35 05 40.14 10 08/21 HYDRAULIC POWER SYSTEMS FOR CIVIL

WORKS STRUCTURES

35 20 14 08/22 STOPLOGS

35 20 16.54 08/21 CAST IRON SERVICE DOOR

35 42 37.00 06 4/24 RIP RAP STONE PROTECTION

35 59 15.00 06 10/20 MARINE SAFETY BOOM

35 73 13 05/21 EMBANKMENT FOR EARTH AND ROCKFILL DAMS

DIVISION 40 - PROCESS INTERCONNECTIONS

40 05 13 08/21 PIPELINES, LIQUID PROCESS PIPING

40 05 13.96 05/21 WELDING PROCESS PIPING

40 33 33 08/21 KNIFE GATE VALVES

DIVISION 41 - MATERIAL PROCESSING AND HANDLING EQUIPMENT

41 22 13.14 08/21 BRIDGE CRANES, OVERHEAD ELECTRIC, TOP

RUNNING

41 22 23.19 05/21 MONORAIL JIB CRANE HOISTS

-- End of Project Table of Contents --

PROJECT TABLE OF CONTENTS Page 4

SECTION TABLE OF CONTENTS

DIVISION 31 - EARTHWORK

SECTION 31 23 00.00 06

CONTROL OF WATER AND DEWATERING

5/24

PART 1 GENERAL

1.1 1.1 DEWATERING

1.1.1 1.1.1 Measurement and Payment

1.1.1.1 1.1.1.1 CONTROL OF WATER AND DEWATERING

1.1.1.2 1.1.1.2 Payment

1.1.1.3 1.1.1.3 Unit of Measure

1.2 1.2 REFERENCES

1.3 1.3 DEFINITIONS

1.3.1 1.3.1 Dewatering

1.3.2 1.3.2 Control of Water

1.3.3 1.3.3 Hydrostatic Groundwater Level

1.3.4 1.3.4 Temporary Piezometer

1.3.5 1.3.5 Wellpoint Dewatering System

1.3.6 1.3.6 Dewatering Specialist

1.4 1.4 SUBMITTALS

1.5 1.5 DATA REQUIREMENTS

1.6 1.6 WATER CONTROL PLANS

1.7 1.7 AVAILABLE DATA

1.8 1.8 PERSONNEL QUALIFICATIONS

1.9 1.9 SATISFACTORY PERFORMANCE OF DEWATERING SYSTEMS

1.10 1.10 GOVERNMENT RESPONSIBILITY

1.11 1.11 CONTRACTOR RESPONSIBILITY

PART 2 PRODUCTS

2.1 2.1 DEWATERING/CONTROL OF WATER SYSTEMS

2.1.1 2.1.1 Wellpoints and Header Pipe

2.1.2 2.1.2 Pumps

2.1.3 2.1.3 Back-Up pumps

2.2 2.2 TEMPORARY PIEZOMETERS

2.3 2.3 SAND PACK FOR WELLPOINTS AND TEMPORARY PIEZOMETERS

PART 3 EXECUTION

3.1 3.1 GENERAL

3.2 3.2 UPSTREAM CONTROL TOWER EXCAVATION

3.3 3.3 TUNNEL

3.4 3.4 DOWNSTREAM STILLING BASIN EXCAVATION

3.5 3.5 REMOVAL

3.6 3.6 DEWATERING DATA

-- End of Section Table of Contents --

SECTION 31 23 00.00 06 Page 1

THIS PAGE INTENTIONALLY LEFT BLANK

SECTION 31 23 00.00 06 Page 2

SECTION 31 23 00.00 06

CONTROL OF WATER AND DEWATERING

5/24

PART 1 GENERAL

1.1 DEWATERING

Provide materials, equipment, and labor to install and maintain pumps, piping, drains, well points, wells, and other facilities required to effectively control, collect, and dispose of groundwater to permit safe and proper completions of the work. Use appropriate equipment and methods for dewatering based on existing site conditions. In addition to the dewatering requirements herein, the Contractor must assume that the control tower excavation and the stilling basin/apron excavation will be flooded by high water on two occasions each and require full dewatering of the entire excavated area. This dewatering is directly related to high water and not any failure of the dewatering systems themselves or failure of the contractor to properly dewater and maintain the initial dewatering.

1.1.1 Measurement and Payment

1.1.1.1 CONTROL OF WATER AND DEWATERING

1.1.1.2 Payment

All incidental costs associated with the performance of work in this section are included in the contract price. Include the cost of all necessary equipment, tools, material, labor, testing, and supervision required to maintain dewatered working conditions for the control tower cofferdam and grouting construction, control tower excavation and construction, tunnel excavation and construction, stilling basin/apron excavation and construction, new and existing stilling basin dewatering, maintaining excavations in a dewatered state, and dewatering necessary for common excavation including construction of footings and to prevent water from ponding on site as required in the specifications. This includes the downstream dewatering system indicated in the Contract Drawings and provisions for dewatering flooded excavations. This item includes but is nto limited to all costs associated with equipment, well drilling, piezometer installation, and other requirement contained herein, shown on the Contract Drawings, and included in the Contractor's Water Control Plan submittals. Government will make no additional separate payment for items included herein or by reference.

1.1.1.3 Unit of Measure

Unit of Measure: Job

1.2 REFERENCES

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

SECTION 31 23 00.00 06 Page 3

ASTM INTERNATIONAL (ASTM)

ASTM C136/C136M (2019) Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates

ASTM C33/C33M (2023) Standard Specification for Concrete Aggregates

ASTM D1785 (2015; E 2018) Standard Specification for Poly(Vinyl Chloride) (PVC), Plastic Pipe, Schedules 40, 80, and 120

U.S. ARMY CORPS OF ENGINEERS (USACE)

ER 1110-1-1807 (2023) Drilling and Invasive Activities at Dams and Levees

1.3 DEFINITIONS

1.3.1 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 in the dry. Includes relief of groundwater pressure and discharge of effluent water. This does not include runoff of surface water into excavated areas.

1.3.2 Control of Water

Control and removal of runoff of surface water into excavated areas.

1.3.3 Hydrostatic Groundwater Level

The groundwater level at any location during construction and before dewatering. The hydrostatic groundwater level will fluctuate during construction as a result of precipitation and pool elevations.

1.3.4 Temporary Piezometer

Temporary instrument to monitor groundwater levels during construction and evaluate performance of dewatering system.

1.3.5 Wellpoint Dewatering System

Dewatering system consisting of a series of small-diameter wells (known as well points) connected via a header pipe to the suction side of a suitable vacuum pump on the surface.

1.3.6 Dewatering Specialist

Professional Engineer, Certified Engineering Geologist, or Certified Hydrogeologist responsible for developing the dewatering plan and operation oversight of the dewatering system.

1.4 SUBMITTALS

Government approval/acceptance by the Resident Office (RO) is required for submittals with a "G" designation; submittals not having a "G" designation are for information only (FIO) or as otherwise designated. When used, a

SECTION 31 23 00.00 06 Page 4 designation following the "G" designation identifies an additional office that will review the submittal for the Government. The following shall be submitted in accordance with LRL Section 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Water Control Plans; G, DO

SD-06 Test Reports

Daily Dewatering/Control of Water Reports; G, DO

Performance Test Reports; G, DO

Piezometer Installation Logs; G, DO

DEWATERING DATA; G, DO

Temporary Piezometer Data; G, DO

1.5 DATA REQUIREMENTS

The Contractor and any Subcontractors performing work specified in this section must provide the data for all of the fields in the SQL database for the project pertaining to dewatering, pump performance, and temporary piezometers as specified by the Section 01 31 00 DATA MANAGEMENT and the Volume 5 attachments. Any data requirements listed in 01 31 00 shall also apply to the data generated in the completion of the work or testing described in this section.

Ensure thorough review of the data specifications in this section, in 01 31 00 DATA MANAGEMENT, and the Volume 5 attachments, and ensure proper review and compliance by any Subcontractors.

1.6 WATER CONTROL PLANS

Submit Water Control Plans, prepared by a qualified, licensed engineer in the State of Kentucky or Indiana, a minimum of 45 days prior to any dewatering and control of water activities. Separate water control plans are required for each feature of work. Features of work requiring a water control plan are, at minimum, the upstream control tower excavation, tunnel, and downstream stilling basin excavation. Any water control plans including dewatering features must be prepared by the Dewatering Specialist.

Include the following in the water control plan for each feature of work.

a. Schedule of mobilization and delivery of personnel, equipment, and materials for installation and testing the dewatering and control of water systems.

b. Qualifications. Provide credentials for personnel to fulfill the following:

a) Dewatering Specialist

b) Dewatering Operations Superintendent

c. Company Experience. Provide project experience for contractor and/or subcontractor(s) working on dewatering system installation and/or

SECTION 31 23 00.00 06 Page 5 operation near a constant groundwater recharge source. Include a minimum of 3 projects in the last 5 years similar to those of this contract. Submit the following:

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

d. Superintendence plan and schedule, indicating who will be responsible for observing the dewatering and control of water systems and the proposed schedule describing when personnel will be on site to observe and maintain the system(s).

e. Detailed plans for operations and maintenance of dewatering and control of water system(s). Account for problems that may arise during operations due to mechanical failure, human error, or degradation of the system over time.

f. Quality Control (QC) Plan for dewatering and control of water system(s).

g. Emergency Plans. Include plans for emergencies that may arise during operation of dewatering and control of water system(s). Include list and hierarchy of individuals to notify in the event of an emergency.

Emergencies include, but are not limited to, failure of system components (power system, pumps, pipes, etc.) during operation, damage to system from construction equipment, a sudden rise in groundwater flows as a result of precipitation and/or a rise in pool elevation.

h. Required Permits. Include all permits required by local, state, and federal law.

i. If selected dewatering and/or control of water measures include drilling, provide proposed drilling methods and resume for Drill Crew Foreman. Drilling for dewatering measures must be accounted for in an approved Drilling Program Plan (DPP).

Include the following in the dewatering plan for the identified feature of work.

a. Upstream control tower

(1) Equipment data including types, sizes, capacities, sources, locations, and other identifying characteristics for all selected dewatering and/or control of water equipment. Provide sample drawdown and performance monitoring data from any equipment used.

(2) Layout of proposed dewatering and/or control of water system(s).

(3) Provide design calculations, including assumptions made, indicating that the system(s) will attain satisfactory performance.

(4) Identify equipment and personnel responsible for emergency dewatering of flooded control tower excavation.

b. Tunnel See Specification 31 71 16.00 06 ROCK TUNNELING paragraph Control of Water for additional requirements. Additionally, the Contractor's control of water requirements must be sufficient to define the Maximum Inflow

SECTION 31 23 00.00 06 Page 6

Requirements at which time the use of rock grouting must be performed as identified in Specification 31 73 00 TUNNEL GROUTING.

(1) Equipment data including types, sizes, capacities, sources, locations, and other identifying characteristics for all selected dewatering and/or control of water equipment. Provide sample drawdown and performance monitoring data from any equipment used.

(2) Layout of proposed dewatering and/or control of water system(s).

(3) Provide design calculations, including assumptions made, indicating that the system will attain satisfactory performance.

c. Downstream stilling basin and concrete apron excavation

(1) Equipment data for wellpoint dewatering system components including types, sizes, capacities, sources, locations, and other identifying characteristics for pumps, drive units, standby equipment, monitoring equipment, flow meters, valves, and discharge piping. Provide sample drawdown and performance monitoring data from any equipment used.

(2) Sequence of the wellpoint dewatering system construction and operation including required tests, initial drawdown period, duration, and schedule(s) or period(s) of active dewatering operation for the system.

(3) Products and Materials Certifications including but not limited to:

Well Screen manufacturer: Certifying well slot width, open area, and slot cleanliness of screen.

Filter Sand Supplier: Certifying gradation data, source of wellpoint sand pack material, and physical characteristics of sand pack material.

(4) Wellpoint dewatering system installation details to include drilling method for wellpoints and temporary piezometers and methods of construction for wellpoints, discharge manifolds, settling basins, and other erosion control features. Include plans for installation of wellpoints in difficult conditions, such as high phreatic heads.

(5) Equipment data and proposed layout for dewatering and/or control of water features used in addition to wellpoint dewatering system.

1.7 AVAILABLE DATA

Refer to the Geotechnical Interpretive Report for boring logs and historical piezometer data available in areas to be dewatered.

1.8 PERSONNEL QUALIFICATIONS

a. Dewatering Specialist(s)

(1) Professional Engineer, Certified Engineering Geologist, or Certified Hydrogeologist responsible for developing the water control plans and operation oversight of the dewatering and/or

SECTION 31 23 00.00 06 Page 7 control of water system(s).

(2) In charge of the design, construction, operation, and maintenance of at least 3 successful projects in the last 10 years similar in nature to that required by this contract with similar subsurface soil site conditions, dewatering depths, construction techniques, and project durations.

b. Dewatering Operations Superintendent(s)

(1) Specifically trained and under supervision of dewatering specialist.

(2) Involved with the construction, operation, and maintenance of at least 3 successful projects in the last 10 years similar in nature to that required by this contract with similar subsurface soil site conditions, dewatering depths, construction techniques, and project durations.

c. Drill Crew Foreman

(1) Serves as the lead driller for installation of dewatering and/or control of water features requiring drilling.

(2) Must meet all driller requirements of ER 1110-1-1807 and Specification SECTION 01 45 04.10 06 CONTRACTOR QUALITY CONTROL

1.9 SATISFACTORY PERFORMANCE OF DEWATERING SYSTEMS

a. Satisfactory performance of the upstream control tower excavation dewatering and/or control of water systems allows for orderly construction to proceed by controlling groundwater flow toward or into the excavation. The system must maintain adequate subgrade conditions for construction to proceed as defined in Specification 35 73 13 EMBANKMENT FOR EARTH AND ROCKFILL DAMS and prevent adverse conditions such as flooding and instability due to sloughing, heaving, or uplift.

b. Satisfactory performance of the tunnel dewatering system allows for orderly construction to proceed by controlling flow groundwater toward or into the excavation. The system must maintain adequate subgrade conditions for construction to proceed as defined in 31 71 16.00 06 ROCK TUNNELING and prevent adverse conditions such as flooding and instability due to water intrusion.

c. Satisfactory performance of the downstream stilling basin and concrete apron excavation is maintaining the groundwater level a minimum of 3 feet below the base of the excavation. In areas where excavation subgrade is less than 3 feet above rock, satisfactory performance is controlling groundwater levels to ensure stable soil and rock conditions that allow safe and orderly construction to proceed.

All data required to assess the performance of dewatering in all areas must be provided in accordance with 01 31 00 DATA MANAGEMENT and the Volume 5 attachments.

1.10 GOVERNMENT RESPONSIBILITY

a. The Government has designed a conceptual dewatering mitigation measures for the control tower excavation consisting of a cofferdam and

SECTION 31 23 00.00 06 Page 8 double line grout curtain. The Government has designed the wellpoint dewatering system at the downstream stilling basin. The design includes locations of system features and material and equipment requirements.

b) For the government-designed wellpoint dewatering system, the Government will evaluate the originally designed system performance based on the submitted performance tests reports. If the system was successful during the performance test in achieving satisfactory performance, the Contracting Officer will provide final approval of the system. If the system was not successful during performance testing, the Government will take up to 10 days to evaluate the performance test reports and any contractor-provided guidance to improve the system and achieve required performance. By the 10th calendar day, the Contracting Officer will provide the contractor written notification of approved alterations to the dewatering/control of water system.

c) For contractor-designed dewatering/control of water systems, or elements of systems, the government will evaluate the system based on observations following installation of the system(s). If the system is successful in achieving satisfactory performance the Contracting Officer will provide final approval of the system. The contractor is responsible for all system modifications if satisfactory performance is not achieved.

1.11 CONTRACTOR RESPONSIBILITY

a. Furnish and install Government designed dewatering facilities according to Plans and other specified requirements. Provide completion reports with installed location of each dewatering facility and designate where the constructed system differs from the design in any way. Perform performance testing on the completed wellpoint system.

b. Design, furnish, and install all dewatering and control of water features not fully designed by the Government including removal of maintenance water from the control tower excavation, removal of a flooded control tower excavation, and the control of water in the tunnel. Provide as-built schematics of the dewatering and control of water systems. Make modifications to systems that do not achieve satisfactory performance.

c. Dewatering specialist(s) and/or dewatering operations superintendent may not be rotated, transferred, or otherwise replaced without prior notification to the Contracting Officer.

d. At designated discharge locations, design, construct, and maintain sedimentation controls to meet requirements of 01 57 19.00 06 TEMPORARY

ENVIRONMENTAL CONTROLS AND PERMITS.

e. Maintain, operate, and monitor the performance of dewatering and control of water systems on a 24-hour per day, 7-day per week basis to ensure that the system maintains satisfactory performance.

(1) Continuously monitor the groundwater level in areas with operating dewatering systems to ensure that the systems are maintaining satisfactory performance.

(2) During periods where the wellpoint dewatering system is not operating, maintain the system such that it can be made operational within 24 hours. Inspect the system at least biweekly.

SECTION 31 23 00.00 06 Page 9

(3) Provide an on-site backup pump for each pump in the wellpoint dewatering system during all times when the system is in operation. Install and make the backup pump fully operable within 60 minutes in event of a pump failure. If a backup pump is used, the original must be repaired to operable condition or replaced within 24 hours. Backup pumps for a nonoperational wellpoint dewatering system are not required, but backup pumps must be provided within 24 hours of the system restarting.

(4) Provide a minimum of one serviceable backup sump pump for every two operational sump pumps. In the event of pump failure, install and make operable the backup pump within 2 hours. If a backup pump is used, the original must be repaired to operable condition or replaced within 24 hours.

f. Provide daily dewatering/control of water reports for each active system. Include the following information in the report, at minimum.

(1) For wellpoint dewatering system, record water levels in temporary piezometers and pump flowmeters on at least an hourly basis

(2) Denote any times a system is nonoperational due to pump failure, damage, maintenance, or any other cause

(3) Note times when the system is switched from a primary pump to a backup and vice versa.

(4) Note any times that a system is not meeting satisfactory performance.

(5) If daily reports are provided in PDF format, provide all piezometer and flowmeter data in Excel format on at least a weekly basis.

(6) Automated readings are acceptable for measurement of groundwater level in temporary piezometers. Verify accuracy of automated instruments by manually recording water level in each piezometer at least once per week and compare to the automated instrument.

(7) When a rise in temporary piezometer levels of more than 1-foot is observed in a 2-hour period, manually verify the water level in the affected piezometer. Provide immediate notification to Contracting Officer if water level rise is verified.

g. Provide the following minimum required personnel:

(1) Dewatering specialist: Able to reach the site within 8 hours during installation and operation of dewatering/control of water systems.

(2) Dewatering operations superintendent(s): On site daily each workday while dewatering/control of water systems are in operation. The dewatering operations superintendent is responsible for all QC related to the installation and operation of dewatering/control of water systems.

(3) Personnel experienced in operation and maintenance of

SECTION 31 23 00.00 06 Page 10 dewatering/control of water systems: On site 24 hours per day, 7 days per week while the dewatering system is in operation. The dewatering specialist and/or dewatering operations superintendent can fulfill this requirement if qualified.

(4) If dewatering is occurring concurrently at multiple locations under this contract, only one set of personnel is required

h. The dewatering specialists and the dewatering operations superintendent(s) only responsibility is installation, operation, maintenance, repair, and monitoring of the dewatering systems.

i. Operate and monitor the fully installed dewatering/control of water systems during performance testing. Provide Performance Test Reports in the same format as daily dewatering/control of water reports.

j. In the event of an unsuccessful performance test, provide suggested alterations to improve system. Begin approved alterations to dewatering system within 7 days after written notification is received from the Government to proceed with alterations. Complete installation within 21 days after receipt of notification.

k. Notify the Contracting Officer immediately in the event of a pump failure or other damage that makes the system inoperable.

l. Remove pumps, equipment, and materials associated with the dewatering systems from the site at the end of the project including related power systems. Removed materials and equipment will remain the property of the Contractor.

m. Provide spare parts and other equipment required to repair dewatering/control of water systems in the event of damage. Damaged or destroyed systems or any component of those systems, resulting from construction activities and/or human error will be repaired or replaced by the Contractor at the Contractor's expense.

PART 2 PRODUCTS

2.1 DEWATERING/CONTROL OF WATER SYSTEMS

Dewatering/Control of Water systems included in this contract include:

a) Control Tower Excavation:

Dewatering/Control of water system(s) consist of contractor-designated layout and equipment. Summarize the proposed dewatering/control of water methods for approval by the Contracting Officer in the Water Control Plans.

Dewatering/Control of water system(s) consist of contractor-designated layout and equipment. Summarize the proposed dewatering/control of water methods for approval by the Contracting Officer in the Water Control Plans. The Haney Limestone is expected to be the greatest contributor of seepage water into the excavation and will likely require that the contractor continually provide maintenance dewatering. The seepage inflow rate has been estimated at roughly 1,200 gallons a day, even after installation of the double-lined grout curtain. The Haney Limestone may transmit some water from infiltrated precipitation, but the primary source will be when the lake level approaches the summer pool. The contractor must also be able to dewater the entire excavation should it become

SECTION 31 23 00.00 06 Page 11 flooded, estimated at a maximum volume of 7.1 million gallons. This will demand high-capacity pumps able to pump at least 90 vertical feet, which will likely require submersible and centrifugal pumps working in tandem.

b) Tunnel:

Dewatering/Control of water system(s) consist of contractor-designated layout and equipment. Summarize the proposed dewatering/control of water methods for approval by the Contracting Officer in the Water Control Plans.

Refer to the Geotechnical Baseline Report for geologic and groundwater data pertinent to system design.

c) Stilling Basin Excavation:

Dewatering/control of water systems consist of the government-designed wellpoint system and contractor-designed control of water system(s).

Summarize the proposed dewatering/control of water methods for approval by the Contracting Officer in the Water Control Plans.

2.1.1 Wellpoints and Header Pipe

a. Dewatering Wellpoints are 2-inch diameter, Schedule 40 ASTM D1785 PVC pipe and screen installed in a drilled hole with a minimum diameter of 6-inches. Use the same supplier for the casing and screen with compatible watertight threaded joints. Glued connections between casing and screen are not permitted. Slots must be 0.025-inch in width and spaced 3/16 inch center-to-center for a maximum open area of 6.35 square inches per 1 foot of slotted pipe. Use only slots installed by the manufacturer. Do not install slots in the field. Surround the entire slotted section of the pipe with silica sand of gradation specified in Subpart 2.3. Required hole depths and screened intervals are shown on the Plans. Install a bentonite seal from the ground surface to a depth of 3 feet.

b. Header pipe consists of 6-inch diameter smooth interior wall PVC or HDPE pipe with saddle connections spaced on 3-foot centers. Each wellpoint is connected to the header pipes via the saddle with flexible swing connections and associated valves allowing for control of flow in individual wellpoints. Use clear pipe for the swing connection to allow for flow observations during operation. Plug all unused saddle connections with an airtight plug.

c. Reuse of riser pipe, swing joints, header pipe, or other wellpoint dewatering system components, other than pumps, from previous projects is not permitted.

2.1.2 Pumps

Use vacuum-assisted dewatering pumps. Pumps must be capable of handling a range of flow values and total dynamic heads and must have sufficient air-handling capability to maintain pumping rate and achieve drawdown.

Equip pumps with sand-trap or similar device to prevent soil material from entering pump. Connect to the 6-inch header pipe using a PVC Schedule 40 reducer. Pumps must be capable of pumping variable flows of approximately 25 GPM to in excess of 250 GPM and a Total Dynamic Head (TDH) of 20 feet to over 35 feet, require a maximum Net Positive Suction Head (NPSH) of 8 feet at the flow and head conditions specified, and operate at a minimum efficiency of 60 percent. In the event of lower than anticipated wellpoint

SECTION 31 23 00.00 06 Page 12 system yields, throttle pumps or employ recirculation systems.

2.1.3 Back-Up pumps

Use backup pumps with the same capacity and pumping capabilities as the pump they are replacing. If the primary pumps use an electric power source, use diesel-powered backup pumps.

2.1.3 Flowmeters

Install flowmeters with an accuracy of plus or minus 10 percent on the pump side of each wellpoint segment shown on the Plans. Use propeller, turbine, acoustic, orifice, or similar type of meter installed in the discharge line in accordance with manufacturer's suggestions. Do not use Pitot tube devices. Calibrate meters by volumetric means before operation and at other times if accuracy is questioned. Replace meters that do not correctly calibrate.

2.2 TEMPORARY PIEZOMETERS

a. Install temporary piezometers at the locations and depths indicated in the Plans and as needed for monitoring of contractor-designed dewatering and/or control of systems.

b. Temporary piezometers are 2-inch diameter, Schedule 40, PVC pipe installed in 6-inch diameter drilled hole. Provide slots for the bottom 5 feet of the pipe. Slots must be 0.01 inch in width and spaced at a maximum of 3/16 inch center-to-center for a maximum open area of 2.51 square inches per 1 foot of pipe. Use only screens with slots installed by the manufacturer. Do not install slots in the field. Plug the bottom of the pipe with a PVC plug. Place a removable cap at the top. Backfill around the entire slotted section and casing with piezometer sand pack.

Place a bentonite plug with a minimum thickness of 3 feet above the sand backfill to the surface elevation. Prepare Piezometer Installation Logs for each piezometer installed and submit within 48 hours of installation. The USACE log template is provided by the Government in the Volume 5 attachments to the technical package.

c. Test temporary piezometers by adding or removing water from the well risers and subsequently monitoring the stabilization of the water levels in the wells to demonstrate that temporary piezometers are functioning properly before taking water level readings. Replace any temporary piezometer that does not function properly.

d. Provide equipment for automated reading and recording of water level in temporary piezometers. Provide temporary piezometer data for verification of dewatering performance weekly while in operation.

2.3 SAND PACK FOR WELLPOINTS AND TEMPORARY PIEZOMETERS

Sand pack for wellpoints and temporary piezometers consists of washed, clean, silica sand composed of hard, tough, and durable particles free from any coating. Filter sand must fit the gradation given in Table 1 with sieve sizes from ASTM C136/C136M. The filter material must not contain detrimental quantities of organic matter or soft, friable, thin, or elongated particles in accordance with the quality requirements in ASTM C33/C33M. Crushed limestone is not allowed.

Table 1

SECTION 31 23 00.00 06 Page 13

U.S. Standard Sieve Size Allowable Percentage Passing by weight

3/8" 100

#4 95-100

#8 80-100

#16 50-85

#30 25-60

#50 5-30

#100 0-10

#200 0-3

PART 3 EXECUTION

3.1 GENERAL

a. During construction, provide devices to remove water entering excavations promptly and dispose of properly. Keep bottoms of excavations firm and free of standing water until construction is completed. Conduct pumping and dewatering such that no disturbance to foundation subgrade materials or to fill materials supporting any other work will result. Pipe discharged water to an approved area. Do not discharge water into the reservoir. Dewatering discharge must not cause siltation or other negative environmental impact on natural waterways or other property; such discharge must be in accordance with applicable federal, state, and local permit regulations. At dewatering discharge locations, install control measures as specified in Section 01 57 19.00 06

TEMPORARY ENVIRONMENTAL CONTROLS AND PERMITS.

b. Discharge water from the dewatering systems may be used for construction activities if approved by Contracting Officer.

c. Obtain all required drilling permits in accordance with federal, state, and local regulations prior to commencement of drilling and installation of the dewatering system (including wellpoints and temporary piezometers).

d. Use drilling method(s) from the approved Dewatering Plan for installation of wellpoints, temporary piezometers, and other dewatering features. The use of jetting for wellpoint installation is not permitted for work under this contract.

SECTION 31 23 00.00 06 Page 14

e. Operate the dewatering and control of water system(s) continuously 24 hours per day, 7 days per week while work is ongoing in the excavation.

Ensure that the systems maintain satisfactory performance and do not allow the water level to rise until work is complete in the excavation and the new outlet works structures are ready to be flooded. The Contracting Officer must approve the cessation of operation of part or all of the dewatering system(s). The Contractor is responsible for any damage resulting from failure to maintain the dewatering system.

f. Provide complete standby equipment and power sources available for immediate operation as may be required, to adequately maintain the dewatering in the event that all or any part of the dewatering system becomes inadequate or fails.

g. Ensure that pumps for operating dewatering and control of water systems are fueled adequately to operate through overnight hours. If a backup pump is required to replace a primary pump that is out of fuel during the night shift, the primary must be immediately refueled and returned to service.

h. Notify the Contracting Officer immediately if a dewatering system is no longer maintaining satisfactory performance.

i. When the dewatering/control of water system does not meet the specified requirements as a result of Contractor's failure to adequately operate or maintain the system(s), and as a consequence, loosening or disturbance of the foundations strata, instability of the slopes, or damage to the foundations or structures occurs, the Contractor is responsible for supplying all materials and labor and performing all work for restoring foundation soils, slopes, foundations, and structures, to the satisfaction of the Contracting Officer, at no additional expense to the Government.

j. Purchase, rental, installation, or mobilization to the site any elements of the dewatering system before approval is at the Contractors risk and will not be reimbursed or compensated if not used.

k. Each pump used on site must have a dedicated, unique name and number.

The pump size, capacity, and serial number must be recorded for each pump. The procedure for determining the flow rate for any given pump is as follows: If a pump is used in a sump excavated into soil or rock, the volume of the sump must be surveyed and recorded. The time to pump the sump dry and the number of pump cycles per unit rate of time must be determined as the basis of the flow rate calculation per pump.

Associated pump tests must occur in the presence of the Contracting Officer's Representative. Total discharge must be determined by summing the flow rate for each pump. Alternatively, the use of flowmeters or other instrumentation may be deployed to measure discharge. Daily flow rate estimates must be compiled as part of the dewatering plan.

3.2 UPSTREAM CONTROL TOWER EXCAVATION

a. Design, furnish, install, maintain, and operate all necessary equipment to prevent groundwater and surface water from flowing into the excavation and accumulating on the subgrade. Accomplish dewatering/control of water in a manner so that stability of excavated slopes is maintained and all construction activities are performed in

SECTION 31 23 00.00 06 Page 15 the dry (free of standing water). In addition to grouting, the Contractor has flexibility to design for additional sumps and/or wells to aid in dewatering.

b. In the event of flooding of the excavation, provide equipment and personnel to dewater the flooding. Mobilize and set-up equipment on-site within 48 hours of notification by Government to commence emergency dewatering. Dewater the excavation within 3 days from commencement of pumping.

3.3 TUNNEL

Design, furnish, install, maintain, and operate all necessary equipment to prevent groundwater and surface water from flowing into the tunnel excavation and accumulating on the subgrade. Accomplish dewatering/control of water in a manner so that stability of excavated structure is maintained and all construction activities are performed in the dry (free of standing water). Water entering the tunnel from the excavation must be channelized and directed to sumps for removal. Continuous flows which impact the tunneling operation must be grouted in accordance with SECTION 31 73 00 TUNNEL GROUTING and SECTION 31 71 16.00 06 ROCK TUNNELING

3.4 DOWNSTREAM STILLING BASIN EXCAVATION

a. Furnish, install, operate, and maintain the government-designed wellpoint dewatering system. Design, furnish, install, maintain, and operate all necessary equipment for dewatering and/or control of water systems to operate in conjunction with the wellpoint dewatering system to prevent groundwater and surface water from flowing into the excavation and accumulating on the subgrade. Accomplish dewatering/control of water in a manner so that stability of excavated slopes is maintained and all construction activities are performed in the dry (free of standing water). Install the wellpoint dewatering system as shown in the plans and in the following sequence:

(1) Install temporary piezometers at locations indicated in the Plans.

(2) Drill 6-inch exploration borings to soil/rock interface using methods from approved Dewatering Plan.

(3) Any borehole deemed by the Contracting Officer to not meet requirements or observed to be caving, sloughing, or unstable must be abandoned. Abandon disapproved boreholes in accordance with requirements found in Subpart 3.5 and applicable local, state, and federal regulations. Drill a replacement borehole in close proximity to the abandoned hole as approved by Contracting Officer.

No payment will be made for abandoned boreholes.

(4) Install the 2-inch diameter wellpoints in the 6-inch borings ensuring that the screened interval is placed just above the top of rock. Backfill the boring around the wellpoint screen and riser pipe with sand pack. Place a bentonite seal with a minimum thickness of 3 feet from the top of the sand pack to the ground surface elevation.

b. Locations of dewatering wellpoints, header lines, pumps, discharge points, and temporary piezometers are given in the Plans. Minimize interference of excavation and construction activity with the location

SECTION 31 23 00.00 06 Page 16 of other features related to the dewatering system. Locations are subject to approval by the Contracting Officer.

c. After installation of wellpoint dewatering system is fully complete, operate the system for 3 consecutive days. Record the water level in the temporary piezometers and flowmeter readings every 15 minutes for the first 4 hours of the test and hourly for the remainder of the test.

If the first Performance Test indicates that the system does not achieve satisfactory performance and the design is insufficient, perform a second performance test once alterations to the system are complete. Performance test reports should include all data included on the daily dewatering reports.

d. Rebound Test: After the completion of performance testing, monitor and report the recovery of groundwater levels after the system is shut off. Record the water level in each temporary piezometer on 15-minute intervals for the first 4 hours after the system is shut off, and hourly thereafter for 20 hours or until the water level is within 5% of the pre-pumping initial condition. Provide the piezometer measurements during the rebound test as a part of the performance tests report.

e. If wells are not constructed with specified materials and to specified dimensions, remove and replace well(s) at contractor's expense.

In the event of flooding of the excavation, provide equipment and personnel to dewater the flooding. Mobilize and set-up equipment on-site within 48 hours of notification by Government to commence emergency dewatering.

Dewater the excavation within 3 days from commencement of pumping.

3.5 REMOVAL

a. Obtain written approval from the Contracting Officer before discontinuing operation of any portion of the dewatering system(s).

b. Remove all equipment from the dewatering system(s) and temporary piezometers from the site at the completion of dewatering work.

c. Abandon temporary piezometers and wellpoints by overdrilling with a hollow stem auger and backfilling holes with approved grout shown in

02 41 00 DEMOLITION.

3.6 DEWATERING DATA

Monitor and provide all dewatering equipment data generated in the course of dewatering which allows for the analysis of drawdown of the specified areas to the required levels. This includes but is not limited to:

1) Pump location of well point system(s) and associated ID in state plane coordinates and elevation in project datums;

2) Temporary monitoring piezometer locations and ID's including state plane coordinates and top of ground and bottom of hole elevations;

3) Pool elevation;

4) Tailwater elevation;

5) Water elevation inside the zone(s) of dewatering;

6) Water level of monitoring PZ's (where utilized);

7) Daily observations for each pump including:

a) Did they run (yes/no);

b) Continuous or intermittent;

c) Water level when pump cycles on/off;

d) Time cycle when pump operates;

SECTION 31 23 00.00 06 Page 17

e) Estimated/measured pump flow rate;

f) Note of any pump outages.

8) Sump/Well point state plane coordinates and bottom elevation;

9) Note of any system or component outage with explanation;

10) Total gallons pumped per day from each area.

Submit data in updates to the enterprise database every 24 hours for display in the web interface in accordance with 01 31 00 DATA MANAGEMENT and the Volume 5 attachments.

-- End of Section --

SECTION 31 23 00.00 06 Page 18

SECTION TABLE OF CONTENTS

DIVISION 31 - EARTHWORK

SECTION 31 23 05.00 06

MASS EXCAVATION

09/21

PART 1 GENERAL

1.1 SUMMARY OF WORK

1.1.1 Related Sections

1.2 MEASUREMENT AND PAYMENT

1.2.1 UNDERWATER DREDGING AND DISPOSAL

1.2.1.1 Payment

1.2.1.2 Measurement

1.2.1.3 Unit of Measure

1.2.1.4 Bid Option - Additional Underwater Dredging and Disposal

1.2.2 UNDERWATER ROCK BLASTING, EXCAVATION, AND DISPOSAL - APPROACH

CHANNEL

1.2.2.1 Payment

1.2.2.2 Measurement

1.2.2.3 Unit of Measure

1.2.2.4 Bid Option - Additional Underwater Rock Blasting, Excavation, and Disposal - Approach Channel

1.2.3 COMMON EXCAVATION AND DISPOSAL

1.2.3.1 Payment

1.2.3.2 Measurement

1.2.3.3 Unit of Measure

1.2.3.4 Bid Option - Additional Common Excavation and Disposal

1.2.4 MECHANICAL EXCAVATION AND DISPOSAL

1.2.4.1 Payment

1.2.4.2 Measurement

1.2.4.3 Unit of Measure

1.2.4.4 Bid Option - Additional Mechanical Excavation and Disposal

1.2.5 SURFACE ROCK BLASTING, EXCAVATION, AND DISPOSAL - CONTROL TOWER

AND APPROACH CHANNEL

1.2.5.1 Payment

1.2.5.2 Measurement

1.2.5.3 Unit of Measure

1.2.5.4 Bid Option - Additional Surface Rock Blasting, Excavation, and Disposal - Control Tower and Approach Channel

1.2.6 SURFACE ROCK BLASTING, EXCAVATION, AND DISPOSAL - STILLING

BASIN AND APRON

1.2.6.1 Payment

1.2.6.2 Measurement

1.2.6.3 Unit of Measure

1.2.6.4 Bid Option - Additional Surface Rock Blasting, Excavation, and Disposal - Stilling Basin and Apron

1.2.7 HANEY LIMESTONE CONCRETE BULKHEADS

1.2.7.1 Payment

1.2.7.2 Measurement

1.3 REFERENCES

1.4 SUBSURFACE EXPLORATION DATA

SECTION 31 23 05.00 06 Page 1

1.5 SUBMITTALS

1.6 DEFINITIONS

1.6.1 Rock Excavation

1.6.2 Mechanical Excavation

1.6.3 Underwater Dredging

1.6.4 Mucking

1.6.5 Over-Excavation

1.6.6 Alluvium

1.6.7 Residuum

1.6.8 Rock

1.6.9 Sound Rock

1.6.10 Unsound Rock

1.6.11 Degree of Weathering

1.6.12 Surface Water

1.6.13 Groundwater

1.6.14 Top Of Rock

1.6.15 Rock Joints

1.7 CLASSIFICATION OF EXCAVATION

1.8 DATA REQUIREMENTS

1.9 PERSONNEL

1.9.1…