CRFQ AGR26-16 - Exhibit B 10-2024-09-27 BC15 Quality Assurance and Inspection Staffing Plan.pdf

ASJV Project Number 18proj007

QUALITY ASSURANCE AND INSPECTION

STAFFING PLAN

Brush Creek Site 15 Dam (WV05511) Mercer County, West Virginia

Prepared for the USDA Natural Resources Conservation Service

January 5, 2024 (Revised September 27, 2024)

NRCS West Virginia Quality Assurance and Inspection Staffing Plan – Brush Creek Site 15 Dam Rehabilitation Project

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QUALITY ASSURANCE AND INSPECTION STAFFING PLAN

BRUSH CREEK SITE 15 DAM REHABILITATION PROJECT (WV05511)

MERCER COUNTY, WEST VIRGINIA

TABLE OF CONTENTS

1.0 PURPOSE

2.0 ITEMS REQUIRING QA INSPECTION AND TESTING

3.0 INSPECTION AND TESTING DETAILS

4.0 TIMING OF INSPECTIONS

5.0 SKILLS NEEDED BY QA STAFF

6.0 NAMES AND QUALIFICATIONS OF QA STAFF

7.0 ESTIMATED NUMBER OF QA STAFF HOURS

8.0 TESTING EQUIPMENT AND FACILITIES NEEDED

9.0 STATEMENT OF QA STAFF AVAILABILITY

10.0 APPROVAL OF QA AND STAFFING PLAN

Appendix A: Estimated Construction Schedule

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1.0 PURPOSE

This Quality Assurance and Inspection Staffing Plan (Plan) has been prepared by Aterra-Schnabel Joint Venture (ASJV) for the Brush Creek Site 15 Dam Rehabilitation Project in accordance with the Natural Resources Conservation Service’s (NRCS) National Engineering Handbook – Part 645 – Construction Inspection: Chapter 3 – Contractor Quality Control and NRCS Quality Assurance. Quality Assurance (QA) is defined as the planned and systematic actions necessary to provide adequate confidence that the work is being constructed in accordance with applicable standards and the Contract Documents. The purpose of this document is to define QA duties, including:

Items requiring inspection and testing

Timing and frequency of inspection and testing

Skills needed by QA inspectors

Names and qualifications of team members

Estimated number of staff hours required for individual QA team members

Equipment and facilities needed

Statement of team member availability

Contractor Quality Control (QC) is defined as activities performed by the Contractor, including developing, implementing, and maintaining a QC system to ensure and document that the work installed meets the minimum requirements of the Contract Documents. The requirements for contractor QC for this project are defined in Construction Specification 94 – Contractor Quality Control.

2.0 ITEMS REQUIRING QA INSPECTION AND TESTING

Table 1 summarizes major items of work to be inspected and/or tested by QA staff during construction and the minimum required frequency of QA activities for each item.

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Table 1. Items of work to be Inspected and/or Tested

Item of Work Minimum Required Frequency of QA

Activity1

Establishing survey controls and mark the limit of disturbance Intermittent

Erosion and sediment control measures installation Intermittent

Removal of water (Dewatering and Stream Diversion) Intermittent

Demolish impact basin, remove/stockpile existing riprap Intermittent

Remove PSW Conduit Sections Continuous

Strip and stockpile topsoil for the embankment excavation and earthfill Intermittent

Embankment excavation and Impact basin excavation Continuous

Toe drain installation Continuous

Chimney drain and filter diaphragm installation Continuous

Removal of pond drain inlet trash rack and slide gate Continuous

Pond drain gate installation Continuous

Riser modifications and repairs Continuous

Principal spillway conduit extension and filter diaphragm installation Continuous

Impact basin construction and backfilling Continuous

Riprap outlet protection installation Intermittent

Embankment earthfill placement Continuous

Vibrating wire piezometer installation Continuous

Topsoiling of embankment Intermittent

Seeding & mulching of embankment Continuous

Strip and stockpile topsoil for the auxiliary spillway excavation Intermittent

Auxiliary spillway excavation Continuous

Auxiliary spillway cutoff and starter wall construction and backfilling Continuous

Auxiliary spillway right training dike construction Continuous

Auxiliary spillway roller compacted concrete installation Continuous

Final grading, placing topsoil on training dike & disturbed areas, and seeding Intermittent

Site clean-up and restoration Intermittent

1 Continuous and Intermittent defined in Construction Specification 94—Contractor Quality Control.

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3.0 INSPECTION AND TESTING DETAILS

The QA Program will be conducted to assure that the specified quality of work is attained. The primary responsibility of the QA personnel is to observe the operations of the Contractor to assure compliance with the conditions of the Contract Documents. This includes, but is not limited to, the physical examination of materials delivered to the site, observation of the placement of materials, observation of the construction techniques, observation of quality control and construction management operations by the Contractor, and the observation of site conditions to assure that design assumptions can be verified.

The QA testing component of the QA Program will be conducted to verify that measurable properties of the work meet the minimum contract requirements.

Periodic QA observations and checks of the Contractor’s QC activities required by Construction Specification 94 will be performed and documented. These will consist of periodic over-the-shoulder observation of the Contractor QC testing procedures, comparison of the QC test results with companion QA test results, and observation of any other items that affect the quality of the project.

The following minimum level of QA testing and/or inspection will be performed. Additional QA testing may be required to assure that the specified quality of work is achieved.

Erosion and Sedimentation Controls: QA staff will monitor installation of the erosion and sedimentation measures and construction activities to be sure they are performed in accordance with the approved Erosion and Sediment Control Plan. Periodic inspections will be made during construction as required in the Erosion and Sediment Control Plan.

Removal of Water: QA staff will monitor foundation dewatering and the diverting of surface water to verify these items are performed in accordance with the Contract Documents.

Excavations: QA staff will monitor excavations for conformance with requirements of the Contract Documents. Excavations for the embankment, toe drain, and auxiliary spillway structures will be monitored. Monitoring will include observation of foundation dewatering; rock surface is all hard, compacted, or cemented materials; surface water diversion prior to and during excavations; and sequencing of construction activities in accordance with requirements in the Contract Documents. QA staff will examine the completed excavation surfaces and mark areas that need additional excavation to remove unsuitable materials. QA staff will observe excavation subgrades in accordance with the requirements in CS21. QA staff will inspect excavation subgrades beyond drainfill extents, such as the abutments, for seeps.

Rock: The design intent is for the embankment toe drain and ASW excavation to extend to the bottom of the materials meeting the requirements for Common Excavation as defined in CS21, Excavation, Section 2, Classification and modified in Section 10.B.9) and Section 10.C.3), respectively. The bottom of the toe drain excavation and ASW excavation shall terminate at the top of materials meeting the requirements for Rock Excavation as defined in Section 2. Identifying suitable top of rock is a key portion of the inspection process for the foundations of the ASW and embankment toe drain. QA staff will need to be very familiar with the judgement of rock surfaces during this process. The top of rock surface shall be cleaned and prepared as required by CS63, Section 10.A.4) for the embankment toe drain and by CS63, Section 10.B.3) for the ASW excavation.

Soil subgrade: The design intent is to remove unsuitable materials, including, but not limited to, loose/soft soils, saturated soils, and organic matter. Evaluate based on visual observations and probing with a penetrometer.

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Earthfill: QA staff will monitor fill placement for conformance with requirements of the Contract Documents, as follows:

o Observe all Contractor QC testing during fill placement operations. Contractor QC testing is specified in Construction Specification 23 – Earthfill.

o Ensure that any earthfill placed at densities lower than the specified minimum density or at moisture contents outside the specified acceptable range of moisture content or otherwise not conforming to the requirements of the specifications are reworked to meet the requirements or removed and replaced by acceptable earthfill;

o Record the location of where material is placed for each day’s placement, the estimated cubic yards and location of any sampling points.

o For Class A compaction, QC testing by the Contractor will consist of at least one in-place moisture and density test for each lift or every 10,000 SF (~250 CY) of fill placed. At least one test will be made for each day that fill is placed. QA staff will ensure that the Contractor communicates their inspection/test results immediately upon completion of the inspection or test and that one copy of all records, inspections, tests performed, and material testing reports shall be submitted to the Engineer within one working day of completion. QA staff will perform at least one companion test per week for comparison.

o Proctor curves showing moisture-density relations and zero air void curves will be developed by the Contractor for every 1,000 cubic yards of each type of earthfill in advance of fill placement. For each compaction test performed, a one-point Proctor test will be performed by Contractor. QA staff will perform at least one companion test per week for comparison.

o For Class C Compaction, no testing is required for earthfill for final grading of disposal areas. The maximum placement layer thickness before compaction is 8 inches and the earthfill shall be moist but not saturated. Earthfill compaction shall be accomplished by equipment spreading and grading the material traversing over each entire lift a minimum of three (3) times.

o QA staff will verify the embankment has been backfilled to the approved minimum elevation shown in the Contractor’s Fill Placement Plan prior to commencement of the winter shutdown as specified in CS23.

Drainfill: QA staff will monitor drainfill placement for conformance with requirements of the Contract Documents. QC Testing by the Contractor will consist of at least one gradation test for each 1,000 cubic yards of each type of drainfill placed. QA staff will perform at least three companion tests for comparison.

o For Class II compaction of each type of drainfill, QA staff will monitor and record the number of passes of compaction equipment – refer to CS24 for additional detail.

Trench Drain Abandonment: QA staff will Inspect return water during flushing of the in-place existing 8-inch diameter corrugated metal pipe collector pipes and outlet pipes within the existing trench drains for sediment and debris. Review video inspection for joint gaps, collapsed pipe sections, and sediment. Refer to CS3 for additional requirements.

Concrete: QA staff will monitor concrete placement for conformance with requirements of the Contract Documents. Staff will observe all Contractor QC testing during concrete placement operations.

o QA staff will closely monitor the Contractor’s operations to verify that all applicable specifications are being met and that specified testing and reporting are being accomplished. The QA staff shall verify that forms, excavations, penetrations, September 27, 2024 Page 5 Aterra-Schnabel Joint Venture Project 18proj007 ©2024 All Rights Reserved construction joints, lines and grades are all properly set and ready prior to scheduling any concrete deliveries.

o QC Testing by the Contractor will consist of at least one air content, temperature, and slump for each truck load; and one set of eight 6"x12" cylinders for every 50 cubic yards of concrete placed, or each day if less than 50 cubic yards is placed on a given day. QA staff will perform at least two companion tests for comparison for the principal spillway impact basin, one companion test for comparison for the ASW tailwater weir wall, and one companion test for comparison for the ASW starter wall.

Steel Reinforcement: QA staff will verify steel size and placement prior to concrete placement and will verify that during concrete placement the rebar is properly located and not displaced.

Roller Compacted Concrete: QA staff will monitor RCC placement for conformance with requirements of the Contract Documents. QA Staff will observe all Contractor QC testing during RCC placement operations and perform periodic spot tests for comparison (i.e., weekly). QC Testing by the Contractor will consist of:

o Aggregate Gradation (during stockpiling) – One test per each 500 tons of each aggregate type.

o Aggregate Moisture Test – One test at the beginning and middle of the RCC placement shift for each type of aggregate.

o Chemical Water Test – For non-potable water, perform testing prior to RCC placement beginning and weekly during RCC placement.

o RCC vebe consistometer times, density, moisture content, and temperature – Four tests per shift of RCC placement at both the plant and placement location.

o In-Place Nuclear Density and Water Content Tests – At least three tests per lift at the placement location with no less than one test for each 100 cubic yards of RCC compacted. QA staff will perform at least two companion tests for comparison.

o Compressive Strength Tests – One set of 10 cylinders per 1,000 cubic yards placed or at least each day of placement. QA staff will perform at least two companion tests for comparison.

o Bedding Mortar – One slump, grout consistency, and compression test each time it is placed. Prepare 1 set of cylinders (4 cylinders) for each 25 cubic yards placed. Perform two compressive strength tests at 7 days and two compressive strength tests at 28 days.

Riprap: QA staff will review submittals, observe samples delivered, and observe riprap placement.

Embankment Upstream Stability Berm: QA staff will review submittals and monitor the placement of materials in accordance with Contract documents. Underwater surveys shall be performed in accordance with the Contract Documents – refer to CS7 and CS61 for additional details on the underwater surveys. Refer to CS61 for additional requirements on the embankment upstream stability berm.

Principal Spillway Conduit: QA staff will inspect the existing PSW conduit section that remains in place for spalls, chips, and deteriorated concrete. Refer to CS41 for additional requirements.

Pond Drain Gate Inspection: QA staff will monitor installation of new pond drain gate to verify the operation of the slide gate and verify this item is performed in accordance with the Contract Documents. QA staff will also refer to the Manufacturer’s installation instructions.

Riser modifications and repairs: QA staff will review submittals and monitor riser modifications to verify these items are performed in accordance with the Contract Documents.

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Vibrating Wire Piezometer Installation: QA staff will review submittals and monitor installation of the piezometers to verify these items are performed in accordance with the Contract Documents.

o QA staff will inspect the open standpipe piezometers for sediment accumulation and debris and verify the standpipe bottom depths match those shown on the Drawings prior to installing vibrating wire instruments and meet the requirements of CS401.

Construction Surveys: QA staff will monitor Contractor’s surveys and verify conformance with requirements of the Contract Documents.

Safety: QA staff will inspect the work area for overhead electric lines prior to commencement with the work and monitor cut slopes to not exceed the grades shown on the drawings.

4.0 TIMING OF INSPECTIONS

Total contract performance time is estimated to be 711 calendar days from issuance of NTP. The estimated construction schedule prepared as part of the Final Design Submission is included as Appendix A. Note that the durations shown on the schedule in Appendix A are in workdays (excluding weekends and holidays).

The estimated construction schedule assumes that construction will start in April 2025 and will be completed in January 2027. It is anticipated that the Contractor will begin the submittal process shortly after NTP and will continue through project completion.

5.0 SKILLS NEEDED BY QA STAFF

We anticipate that the construction observation services and QA activities will be led by a Resident Project Representative and assisted by an additional technician/inspector, as needed, if several construction activities are occurring simultaneously. Skills needed for the Resident Project Representative include:

Ability to effectively communicate with the contractor, project sponsors, NRCS specialists, other observers, and designers.

Understand OSHA and other applicable safety regulations.

Understand the design concept.

Maintain required records.

Understand plans and specifications.

Knowledge of soil properties and classification.

Familiar with earth and drainfill placement operations.

Understand construction of drainage systems.

Capable of evaluating subsurface conditions in terms of conditions described in the geotechnical engineering report and/or know when to communicate with the design and/or geotechnical engineer.

Ability to judge rock surface to be all hard, compacted, or cemented materials.

Familiar with concrete and roller compacted concrete placement operations.

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Ability to perform quality assurance tests and inspections.

Ability to observe and understand Contractor QC testing.

Knowledge of construction methods, equipment, and capabilities.

Familiar with foundation dewatering and diversion of surface water.

Familiar with installation and maintenance of erosion and sediment control plans.

Minimum 5 years of experience in heavy construction related activities.

Experience with dam construction preferred.

Required training for Resident Project Representative includes:

Trained to operate nuclear density gage.

ACI technician certifications are preferred.

In addition, a licensed geologist will be needed to inspect and approve rock foundation subgrades.

6.0 NAMES AND QUALIFICATIONS OF QA STAFF

Specific individuals assigned to lead construction observation services and technical support for this project have not been identified at this time. Names and qualifications of QA staff can be provided with the final plan.

7.0 ESTIMATED NUMBER OF QA STAFF HOURS

Based on the estimated construction schedule included in Appendix A, we estimate the following number of hours needed for QA Staff:

Table 2. Estimated Hours for QA Staff

QA Staff Assumptions Total Hours

Resident Project COR and Two

(2) Inspectors

10 hrs/week; ~7 weeks (submittal reviews) 30 hrs/week; ~10 weeks (site prep)

50 hrs/week; ~70 weeks (active dam construction, including 12 weeks for winter shutdown) 30 hrs/week; ~7 weeks (site restoration)

12,240

Office Support* 10 hrs/week; ~94 weeks 940

* Office support includes biweekly (virtual) meetings, coordination and oversight of field staff, submittal review, RFI responses, etc.

8.0 TESTING EQUIPMENT AND FACILITIES NEEDED

The Contractor will furnish a field office as specified by Construction Specification 96 – Field Office. The facility will include electricity, lights, work tables, propane burners, and a microwave oven. The Contractor will furnish an on-site laboratory and will provide all equipment needed to perform all quality assurance testing to meet the Contract requirements.

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Limited equipment will be needed for QA field testing of earthfill, and concrete including a nuclear density gage, one-point Proctor kit, slump cone, infrared thermometer, concrete air meter and stackable sieves with a shaker.

9.0 STATEMENT OF QA STAFF AVAILABILITY

A statement regarding the availability of QA Staff will be provided with the final plan after specific individuals are assigned to the project.

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10.0 APPROVAL OF QA AND STAFFING PLAN

Jon Bourdon Date:

State Conservationist

Andy Deichert Date:

State Conservation Engineer

Laureen Eipp Date:

Contracting Officer

Derrick Crane Date:

Contracting Officer’s Representative

APPENDIX A

ESTIMATED CONSTRUCTION SCHEDULE

ID Task Mode Task Name Duration Start Finish

1 Brush Creek Site 15 Dam Rehabilitation Project 454 days Tue 4/1/25 Mon 1/25/27 2 Contract award 1 day Tue 4/1/25 Tue 4/1/25 3 Begin lowering reservoir 15 days Wed 4/2/25 Tue 4/22/25 4 Pre-construction submittals (Schedule, Safety Plan, etc) 35 days Wed 4/2/25 Tue 5/20/25

5 Phase 1 127 days Wed 5/21/25 Wed 11/19/25 6 Mobilization 5 days Wed 5/21/25 Wed 5/28/25 7 Stake and flag the limits of disturbance and limits of clearing and grubbing, initial set up surveys (staging areas, layout control points)

5 days Thu 5/29/25 Wed 6/4/25

8 Initial Pollution Control (E&SC) measures for site perimeter and site access

5 days Thu 6/5/25 Wed 6/11/25

9 Install stabilized construction entrances, access roads, and stream crossings

5 days Thu 6/12/25 Wed 6/18/25

10 Clearing 3 days Fri 6/20/25 Tue 6/24/25 11 Install Phase 1 E&SC measures 10 days Wed 6/25/25 Wed 7/9/25 12 Grubbing 2 days Thu 7/10/25 Fri 7/11/25 13 Establish temporary facilities, including construction staging and stockpile areas, field office, and QA/QC lab 25 days Thu 7/10/25 Wed 8/13/25

14 Implement stream diversion system to divert flows through the impact basin work area and to the outlet channel

2 days Mon 7/14/25 Tue 7/15/25

15 Abandon the current embankment drain system 5 days Wed 7/16/25 Tue 7/22/25 16 Demolish impact basin and remove and stockpile riprap outlet protection 2 days Wed 7/23/25 Thu 7/24/25

17 Strip and stockpile topsoil within excavation and earthfill limits of the embankment

2 days Thu 7/31/25 Fri 8/1/25

18 Excavate for embankment toe drain and impact basin, and perform foundation preparation activities

15 days Mon 8/4/25 Fri 8/22/25

19 Order new Pond Drain Gate 4 mons Wed 5/21/25 Mon 9/15/25 20 Install Pond Drain Gate 2 days Tue 9/16/25 Wed 9/17/25 21 Complete riser modifications 15 days Thu 9/18/25 Wed 10/8/25 22 Install Upstream Slope Stability Modifications 30 days Thu 10/9/25 Wed 11/19/25 23 Phase 2 185 days Mon 8/25/25 Wed 5/20/26 24 Install principal spillway pipe cradle and conduit extension 10 days Mon 8/25/25 Mon 9/8/25

25 Construct impact basin, seepage collection boxes, and riprap outlet protection

15 days Tue 9/9/25 Mon 9/29/25

26 Remove stream diversion system and divert flows through the principal spillway riser and new impact basin

2 days Tue 9/30/25 Wed 10/1/25

27 Install riprap wave protection on upstream end of ASW 5 days Tue 9/30/25 Mon 10/6/25

28 Begin proposed embankment toe drain drainfill and earthfill. Prepare site for winter shutdown (e.g., temporary seeding exposed soil subgrades)

45 days Tue 9/23/25 Mon 11/24/25

29 WINTER SHUTDOWN 85 days Tue 11/25/25 Wed 4/1/26

30 Spring Start-up 5 days Thu 4/2/26 Wed 4/8/26 31 Haul and stockpile RCC aggregates and set up RCC batch plant 25 days Thu 4/9/26 Wed 5/13/26

32 Perform RCC test section 5 days Thu 5/14/26 Wed 5/20/26

33 Resume the proposed embankment toe drain drainfill and earthfill, backfill to minimum toe berm elevation shown on the Drawings

15 days Thu 4/9/26 Wed 4/29/26

34 Place temporary seeding on embankment 2 days Thu 4/30/26 Fri 5/1/26 35 Phase 3 22 days Thu 4/30/26 Mon 6/1/26 36 Install Phase 3 E&SC measures 5 days Thu 4/30/26 Wed 5/6/26

37 Strip and stockpile topsoil within excavation and earthfill limits of the auxiliary spillway

2 days Thu 5/7/26 Fri 5/8/26

38 Excavate for auxiliary spillway RCC chute spillway and perform foundation preparation activities

15 days Mon 5/11/26 Mon 6/1/26

39 Phase 4 124 days Tue 6/2/26 Tue 11/24/26 40 Construct tailwater weir wall footing, downstream cutoff wall, and upstream starter wall 15 days Tue 6/2/26 Tue 6/23/26

41 Install the chute spillway underdrainage system and construct RCC steps and training walls

45 days Wed 6/24/26 Tue 8/25/26

42 Construct the left and right auxiliary spillway training dikes to final grades

20 days Wed 7/29/26 Tue 8/25/26

43 Construct tailwater weir wall and baffle blocks 20 days Wed 8/26/26 Wed 9/23/26 44 Backfill embankment toe berm to final grade 5 days Wed 8/26/26 Tue 9/1/26 45 Install embankment geotechnical instrumentation 10 days Wed 9/2/26 Wed 9/16/26 46 Complete final grading; place topsoil for training dike, embankment toe berm, and disposal areas; and seed and stabilize

10 days Thu 9/17/26 Wed 9/30/26

47 Remove E&SC measures 5 days Thu 10/1/26 Wed 10/7/26 48 Site clean-up and restoration 10 days Thu 10/8/26 Wed 10/21/26 49 Substantial Completion 1 day Thu 10/22/26 Thu 10/22/26 50 Punchlist, final record surveys, and demobilization 22 days Fri 10/23/26 Mon 11/23/26 51 Final Completion 1 day Tue 11/24/26 Tue 11/24/26 52 Irrigation and mowing 3 mons Fri 10/23/26 Mon 1/25/27

53 Project Acceptance 0 days Mon 1/25/27 Mon 1/25/27 1/25

Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Qtr 2, 2025 Qtr 3, 2025 Qtr 4, 2025 Qtr 1, 2026 Qtr 2, 2026 Qtr 3, 2026 Qtr 4, 2026 Qtr 1, 2027

Brush Creek Site 15 Dam Rehabilitation Construction Schedule Estimate

August 2023