CRFQ AGR26-16 - Addendum No 5.PDF

Date Printed: Dec 31, 2025 Page: 1 FORM ID: WV-PRC-CRFQ-002 2020/05

Department of Administration Purchasing Division 2019 Washington Street East Post Office Box 50130 Charleston, WV 25305-0130

State of West Virginia Centralized Request for Quote

Construction

Proc Folder: 1793301 Reason for Modification:

Doc Description: Brush Creek 15 Dam Rehabilitation-Construction Addendum No. 05

Proc Type: Central Purchase Order

Date Issued Solicitation Closes Solicitation No Version

2025-12-31 2026-01-14 13:30 CRFQ 1400 AGR2600000016 6

BID RECEIVING LOCATION

BID CLERK

DEPARTMENT OF ADMINISTRATION

PURCHASING DIVISION

2019 WASHINGTON ST E

CHARLESTON WV 25305

US

VENDOR

Vendor Customer Code:

Vendor Name :

Address :

Street :

City :

State : Country : Zip :

Principal Contact :

Vendor Contact Phone: Extension:

FOR INFORMATION CONTACT THE BUYER

Larry D McDonnell 304-558-2063 larry.d.mcdonnell@wv.gov

Vendor Signature X FEIN# DATE

All offers subject to all terms and conditions contained in this solicitation

Date Printed: Dec 31, 2025 Page: 2 FORM ID: WV-PRC-CRFQ-002 2020/05

ADDITIONAL INFORMATION

Addendum No. 05 To post answers to vendor questions.

To attach the following revised documents:

BC15 CS61 Rock Riprap BC15 CS95 Geotextile 15-C-16 - Toe Drain Details

To attach the following documents:

Firmette_BC15 BC15 Final Structural Conditions Report

Bid opening date and time still remains 01/14/2026 at 1:30PM EST/EDT

No other changes

INVOICE TO SHIP TO

AGRICULTURE

DEPARTMENT OF

WEST VIRGINIA

CONSERVATION AGENCY

ADMINISTRATIVE SERVICES WEST VIRGINIA

CONSERVATION AGENCY

1900 KANAWHA BLVD E 255 GUS R DOUGLASS LN

CHARLESTON WV CHARLESTON WV

US US

Line Comm Ln Desc Qty Unit Issue Unit Price Total Price 1 Brush Creek Site 15 Dam Rehab Construction

Services

Comm Code Manufacturer Specification Model #

72141203

Extended Description:

Dam Rehabilitation services for Brush Creek 15.

See all attached documentation for further details.

PLEASE READ INSTRUCTIONS IN THEIR ENTIRETY. THE AMOUNT ENTERED ON THIS COMMODITY LINE SHOULD BE

THE TOTAL COST FOR SITE 15 - SEE EXHIBIT A PRICING PAGE.

SCHEDULE OF EVENTS

Line Event Event Date 1 Pre-Bid Meeting 10:30AM EST/EDT 2025-11-12 2 Vendor questions due by 2:00PM EST/EDT 2025-12-01

SOLICITATION NUMBER: CRFQ AGR26*16

Addendum Number: 5

The purpose of this addendum is to modify the solicitation identified as (“Solicitation”) to reflect the change(s) identified and described below.

Applicable Addendum Category:

[ ] Modify bid opening date and time

[ ] Modify specifications of product or service being sought

[X] Attachment of vendor questions and responses

[ ] Attachment of pre-bid sign-in sheet

[ ] Correction of error

[X] Other

Description of Modification to Solicitation:

To post answers to vendor questions.

To attach the following revised documents:

Site 15 – Exhibit A – Pricing Page BC15 CS21 Excavation

BC15 CS61 Rock Riprap BC15 CS95 Geotextile 15-C-16 – Toe Drain Details

To attach the following documents:

Firmette_BC15 BC15 Final Structural Conditions Report

Bid opening date and time still remains 01/14/2026 at 1:30PM EST/EDT

No other changes

Additional Documentation: Documentation related to this Addendum (if any) has been included herewith as Attachment A and is specifically incorporated herein by reference.

Terms and Conditions:

1. All provisions of the Solicitation and other addenda not modified herein shall remain in full force and effect.

2. Vendor should acknowledge receipt of all addenda issued for this Solicitation by completing an Addendum Acknowledgment, a copy of which is included herewith. Failure to acknowledge addenda may result in bid disqualification. The addendum acknowledgement should be submitted with the bid to expedite document processing.

ADDENDUM ACKNOWLEDGEMENT FORM

Addendum 05 CRFQ AGR2600000016 - Vendor Q&A

1. Question: Are there any other projects related to this one in the near future? Is there a budget range for this project, $10-20M or more? Trying to get a sense of the size.

a. Answer: Though there are no immediate solicitations pending, WV Conservation Agency has intentions to solicit for future dam rehabilitation-construction projects.

b. Answer: It is not in the interest of the State of West Virginia to disclose budget ranges for solicitations.

2. Question: What is the magnitude of this job? moneywise?

a. Answer: The magnitude of this job can be approximated using the solicitation documents.

b. Answer: See answer to 1B.

3. Question: I am requesting to be added as a plan holder for this project. I have obtained the drawings and specs from construct connect but wanted to make sure these are accurate

a. Answer: WV Conservation Agency is unaware of any process that adds vendors as “Plan Holders”.

b. Answer: WV Conservation Agency is unaware of “Construct Connect”. All drawings and specifications can be found on the Vendor Self Service (VSS) portal under solicitation CRFQ AGR2600000016.

*Questions 4-8 are in reference to the following statement.

The solicitation includes a section in the Federal Funds Addendum regarding MBE/WBE solicitation and appears to require “Good Faith Efforts”.

4. Question: Is the contractor required to document and submit these efforts with the bid submittal?

Answer: No

5. Question: Is the contractor required to document utilization throughout the duration of the contract?

Answer: No

6. Question: Are there specific forms for documentation if required?

Answer: No

7. Question: Are there specific MBE/WBE databases that are required to be used to identify such firms (i.e. WVDOT, WV SWAM rpt, etc.)?

Answer: No

8. Question: Are there any minimum participation limits?

Answer: No

9. Question: Could the question date to this project be extended?

Answer: Question date had been extended to December 01, 2025. .

10. Question: Based on our review of the contract documents we have several concerns related to the upstream scope of work. See below:

a. In an effort to get the domestic cast iron sluice gate ordered in time to be installed during specified drawdown schedule, we believe the preliminary investigation (field verification of existing conditions) will need to be performed by divers as early as possible. In order to complete this task, an unknown volume of sediment will need to be dredged but the specifications do not address dredging. Considering this operation would need to take place while the PSD would be actively drawing raw water, we expect there would be some restrictions/limitations to completing dredging work as ask that this be clarified.

i. Note: Hydro-Gate sales rep has indicated a lead time of approximately 36 weeks (for domestic cast iron gate) from release to start shop dwgs which would most likely push this work into the second construction season.

Answer:

The intent is for the gate investigation to be performed at the beginning of the project due to the expected lead times for the gate procurement. CS-71 states to sidecast sediment away from the riser and that an estimated 6-9 feet of sediment is present within the vicinity of the riser. Sediment may not be removed from the reservoir, so the Contractor will not be required to obtain a permit for sediment removal for the initial investigation, or for the upstream stability berm work. Also stated in CS 71, the Contractor shall submit a Pond Drain Gate Removal Plan that includes a narrative of removal of sediment around the riser. Payment for work associated with initial sediment removal shall be paid for under Bid Item 35 - Removal of Pond Drain Gate

b. The condition and volume of sediment to be removed to complete upstream improvements is essentially unknown and may require significant effort to relocate this material within the reservoir footprint inside the delineated LOD. The description for Bid Item 35 in specification 71, section 8.C.1.a - notes “side casting” of sediment. As noted, depending on the condition of this material additional controls may be required to manage/relocate the sediment making it possible to construct the upstream riprap berm and replace the gate. We request the addition of a bid line item to capture and pay for this activity as well as establishing a volume for basis of bid. We also request further clarifications related to management of this material within the reservoir footprint as it could potentially have an impact on operations of the dam facility.

Answer

Payment for initial removal of sediment to verify the gate measurements will be paid for in line item 35 - Removal of Pond Drain Gate. Payment for sediment to be relocated for the installation of the upstream stability berm will be paid for in line item 31 – Embankment Upstream Stability Berm. The LOD shown should provide sufficient area for the relocation of sediment within the reservoir. Approximate sediment elevations and removal limits are shown on drawings 15-C-31 and 15-S-11.

c. Additionally, per paragraph 8.C.3.a - if the contractor has to remove sediment to perform the gate removal work, the contractor is required to obtain necessary permits from responsible authorities. This too could have a substantial impact on the timeline of getting the sluice gate ordered in time for installation window.

Answer:

See responses to previous items.

11. Question: Bid Item 8 section 4.A.9 requires the contractor to repair public roads in the vicinity of the project site. Can project vicinity be further clarified? Can a paving section of existing roads adjacent to the site be provided to help evaluate stability and repair costs.

Answer:

Per correspondences with WVDOH, Dale Hale Reservoir Road (20/12) and Gobbler Run Road ((20/13) are both “local service routes with a 65,000 lb legal weight limit. Both are open to legal 65,000 lb standard legal traffic”. Additionally, WVDOH stated that in regard to the two bridges on these routes, “There are no restrictions on those two structures”. If oversized/overweight loads are needed, a permit is required, see https://transportation.wv.gov/highways/maintenance/hauling_permits/Pages/defa ult.aspx.

CS8, 4., A., 9) - Demobilization shall also include the repair of any damage to paved public roads within the project vicinity in accordance with West Virginia Department of Transportation standards and used for heavy equipment access and material deliveries that exceeds the weight limits for those roads. Damaged areas shall be repaired to pre-work condition or better to the satisfaction of the COR. No separate payment will be made for these restoration activities.

https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftransportation.wv.gov%2Fhighways%2Fmaintenance%2Fhauling_permits%2FPages%2Fdefault.aspx&data=05%7C01%7C%7C1f362241eb4c47da9d3508dafe46c981%7Ced5b36e701ee4ebc867ee03cfa0d4697%7C0%7C0%7C638101877236562084%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=ICGI4qHlo1MMGjFwckFPusb3pC8zyloYi16Sn6VIDLg%3D&reserved=0 https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftransportation.wv.gov%2Fhighways%2Fmaintenance%2Fhauling_permits%2FPages%2Fdefault.aspx&data=05%7C01%7C%7C1f362241eb4c47da9d3508dafe46c981%7Ced5b36e701ee4ebc867ee03cfa0d4697%7C0%7C0%7C638101877236562084%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=ICGI4qHlo1MMGjFwckFPusb3pC8zyloYi16Sn6VIDLg%3D&reserved=0

12. Question: Section 7 RCC Mix Plant of RCC specification 36 indicates the plant must be a pugmill. Please clarify if volumetric mixing trucks set up in a stationary, continuous mixing plant configuration would be considered acceptable.

Answer:

All mixing plants need to meet the requirements of Section 7 or as supplemented by Section 22, A. 6).

13. Question: The RFP documents appear to conflict with regard to the contractor license requirement. General Terms and Conditions item 7 notes the request for proof may be prior to or after contract award. Additional Terms and Conditions item 1 notes successful Vendor must furnish a copy of its contractor license prior to issuance of contract award. Exhibit A Pricing Page requests vendor to include a copy of contractor license with the bid response. Please confirm if the vendor is required have a contractor license in place at time of bid and a copy included with the bid submission.

Answer: Vendors should submit a copy of contractor’s license with bid response but are not required to do so. Vendors must provide Contractor’s License upon request prior to contract award.

14. Question: Subcontractor List – Additional Terms and Conditions of the RFP itiem 10 notes:

this section does not apply to any other construction projects, such as highway, mine reclamation, water or sewer projects. It also indicates that the apparent low bidder shall submit the Subcontractor list within one business day of bid opening. Please confirm if the Subcontractor list is required for this project and if it has to be submitted with the bid submission.

Answer: Any vendor using subcontractors must submit list to the WV Purchasing Division within one business day of bid opening.

15. Question: Downstream Embankment work – the Construction Contract Sequencing document includes Dam Safety criteria requiring the downstream embankment scope be completed within the same calendar year. The construction sequence notes on the E&S drawings appear to indicate this scope starting in one construction season (Phase 1A), prepare for winter shutdown by protecting exposed soils (Phase 2), and resuming in the spring (Phase 2). Please clarify construction restrictions related to downstream embankment scope.

Answer:

The Construction sequencing criteria is required for development of the construction schedule. The E&S implementation sequence shall be modified to accommodate the sequencing criteria and approved construction schedule. All downstream embankment work shall be completed with the same calendar year.

16. Question: Site 14 fill stockpile – the Construction Contract Sequencing document considerations note that the Site 15 contractor shall stockpile 9,220 CY of Earthfill materials for future use by Site 14 contractor. Is the Site 15 contractor required to balance the earthfill for both Site 14 and Site 15, if other words – what happens if there is not sufficient suitable earthfill to provide a 9,220 CY stockpile for Site 14? Please clarify. Additionally, is the Site 15 contractor required to conduct QC testing confirming suitability of stockpiled materials for future use?

Answer:

The Site 15 Contractor will be required to construct the downstream berm on the embankment to the required minimum elevations, and stockpile/stabilize excess suitable material available for the Site 14 Contractor. If there is not sufficient on-site suitable material to provide 9,220 CY for the Site 14 Contractor, the Site 15 Contractor will not be responsible for providing additional materials from off-site sources. The Site 15 Contractor will be responsible for initially testing the material prior to stockpiling to confirm it is suitable for use and confirming the amount of material stockpiled prior to closeout of the project.

17. Question: Please confirm if the Contractor’s Quality Control Supervisor (as defined in specification 94) can be assigned other duties and if they are required to be on-site fulltime.

Answer:

The Quality Control Supervisor could be assigned other duties, however the supervisor must be separate and apart from line supervision per CS94.

18. Question: Please confirm there are no stockpile location restrictions within the LOD.

Answer:

Stockpiles can be located within the identified limits of disturbance. The contractor should identify the proposed locations on their Staging and Stockpiling Plan per CS8.

19. Question: Specification 26, Section 7.A.2 references Method 1 shall apply. Method 1 states unsuitable materials encountered shall be disposed of onsite or hauled and disposed of offsite. Please confirm unsuitable soil and excess topsoil will remain onsite and not require disposal offsite.

Answer:

It is anticipated the unsuitable soil materials, and excess topsoil will be disposed of on-site.

20. Question: Please confirm if the 100yr floodplain encroaches the LOD? If so, please provide the locations.

Answer:

The FEMA Zone A flood hazard area is illustrated on the attached National Flood Hazard FIRMette (FIRMETTE_BC15). The Site 14 reservoir, 100-year, 24-hour flood pool, at elevation is 2432.6, is located north of Gobbler Run Road, which is outside the Site 15 LOD area.

21. Question: If encountered, please confirm how the contractor will be compensated for rock excavation?

Answer:

The specification defines common excavation as the excavation of materials that can be excavated, transported, and unloaded using heavy ripping equipment and pusher tractor (having a power rating of at least 150 flywheel horsepower). The intent is to remove material meeting that definition for excavations shown on the drawings. Any rock excavation, if encountered, would be measured and paid for under bid item 10 - Embankment, Common Excavation, and bid item 11 – Auxiliary Spillway, Common Excavation respectively. The most likely places where rock may be encountered include but is not limited to trenching in cutoffs for structures such as the impact basin and tailwater weir wall. A revised Construction Specification 21, Excavation is attached.

22. Question: Multiple concrete structures (Impact basin & RCC Structural Concrete) are proposed to be excavated to rock and foundation set on top of rock. However, these structures also call for concrete turndowns below bedrock. Where will the contractor be compensated for rock excavation in these areas?

Answer:

See previous response.

23. Question: Can the existing office building be utilized for the QA/QC laboratory? This will be a potential savings for the owner.

Answer:

The existing building does not have enough space to meet the specifications to be properly utilized as the QA/QC laboratory.

24. Question: Sediment relocation required for the construction of the Embankment Upstream Stability Berm is described in the requirements of Upstream Stability Berm Installation Plan, however sediment relocation is not listed as a separate bid item.

Under which bid item will sediment relocation be paid?

Answer:

See response to question 10 above.

25. Question: If sediment relocation described above is not to be included in a new cost/CY bid item, what quantity of sediment should the bidders assume in their bid?

Answer:

See response to question 10 above.

26. Question: The quantity listed for the Principal Spillway Pipe Extension is listed as 24LF on the bid form and Drawing 15-S-10 lists Pipe extension length of over 27 LF. Please confirm which quantity should be used.

Answer:

The principal spillway pipe extension is 27 feet and 4 inches. The bid Item 26 quantity has been revised to 27.3’. Refer to the attached updated Exhibit A Pricing Pages, version 3.

27. Question: Detail 2 for the seepage collection box presented on Drawing 15-C-16 calls out a stainless-steel baffle in the plan view however the baffle is not shown in the section view. Please confirm the dimensions of the baffle or advise if the baffle is not required.

Answer:

The baffle is not required and has been removed from the drawing. Revised Drawing 15-C- 16 is attached.

28. Question: Bid item 22 for the concrete repair and waterproofing has a bid quantity of 790 SF. Should the bidders assume the entire 790 SF requires repair and waterproofing?

Answer:

The intention is for the application of a uniform coating of concrete repair material and separate application of a water proofer along with the manufacturer’s recommended primer.

29. Question: Is documentation (photos, video, inspection reports) available to review the condition of the interior of the PSW that the bidders may use to estimate the extent and severity of the repairs required under bid item 22?

Answer:

Per the Structural Conditions Report, “The interior concrete surface appeared to be in fair condition, with no observed cracking, spalling, bulging, leaking, or exposed rebar. Some concrete abrasion was observed on the interior walls.” Also note the Structural Conditions Report states that the pond drain gate is inoperable (Reference CS11, 8., B., 5), ii.). The Brush Creek Site 15 Final Structural Conditions Report is attached.

30. Question: Bid Item 30 - Rock Riprap, PSW Outlet and ASW Entrance do not appear to include the ASW Outlet riprap, nor does it appear to be included as a subsidiary to any other bid items. Please advise where the contractor should include costs for the riprap associated with the ASW outlet.

Answer:

Bid Item 30 includes the ASW Outlet Riprap. A revised Construction Specification 61, Rock Riprap, and Construction Specification 95, Geotextile, is attached. The bid item description for Bid Item 30 has been revised to “Rock Riprap, PSW Outlet and ASW”. Refer to the attached updated Exhibit A Pricing Pages, version 3.

REVISED DOCUMENTS AS OF 12/30/2025

Site 15 – Exhibit A – Pricing Page

BC15 CS21 Excavation

BC15 CS61 Rock Riprap

BC15 CS95 Geotextile

15-C-16 – Toe Drain Details

1 Clearing and Grubbing CS 2 2.3 AC 2 Structure Removal CS 3 1 LS 3 Trench Drain Abandonment CS 3 1 LS 4 Pollution Control CS 5 1 LS 5 Permanent Seeding and Mulching CS 6 4.6 AC 6 Construction Surveys CS 7 1 LS 7 Mobilization and Demobilization CS 8 1 LS 8 Excavation Dewatering CS 11 1 LS 9 Stream Diversion CS 11 1 LS

10 Embankment, Common Excavation CS 21 26,200 CY 11 Auxiliary Spillway, Common Excavation CS 21 13,800 CY 12 Earthfill CS 23 34,190 CY 13 Fine Drainfill CS 24 5,800 CY 14 Coarse Drainfill CS 24 470 CY 15 Topsoil CS 26 23,300 SY 16 Topsoil Import CS 26 1,770 CY 17 Cast-in-Place Reinforced Concrete, Impact Basin CS 31 40 CY 18 Cast-in-Place Reinforced Concrete, PSW Cradle CS 31 7 CY 19 Cast-in-Place Reinforced Concrete, ASW Starter Wall CS 31 81 CY

Cast-in-Place Reinforced Concrete, ASW Tailwater Weir and Baffle Blocks

CS 31 530 CY

21 Mudmat CS 31 142 CY 22 Concrete Repair, Principal Spillway Riser CS 35 790 SF 23 Roller Compacted Concrete CS 36 4,430 CY 24 Furnishing and Handling Cementitious Material for RCC CS 36 1,110 TN 25 Roller Compacted Concrete Test Section CS 36 260 CY 26 Principal Spillway Pipe Extension CS 41 27.3 LF 27 Toe Drain Piping CS 45 530 LF 28 Precast Seepage Collection Boxes CS 45 1 LS 29 ASW Drain Piping CS 45 400 LF 30 Rock Riprap, PSW Outlet and ASW CS 61 1,480 CY 31 Embankment Upstream Stability Berm CS 61 13,730 CY 32 Rock Foundation Preparation, Embankment CS 63 215 SY 33 Rock Foundation Preparation, ASW CS 63 500 SY 34 Installation of New Pond Drain Gate, Gate Stem, and Stem GuidesCS 71 1 LS 35 Removal of Pond Drain Gate CS 71 1 LS 36 Stainless Steel Metalwork CS 81 1 LS 37 Principal Spillway Fatigue Platform CS 81 1 LS 38 Principal Spillway Guardrail CS 81 1 LS 39 Impact Basin Guardrail CS 81 1 LS 40 Impact Basin Grating CS 81 1 LS 41 Principal Spillway Ladder CS 81 1 LS 42 Staff Gauge, Principal Spillway Riser CS 93 1 LS 43 Project Monument CS 93 1 LS 44 Construction Quality Control CS 94 1 LS 45 Field Office CS 96 1 LS 46 Geotechnical Instrumentation CS 401 1 LS

TOTAL =

UNIT DEFINITIONS: LS=Lump Sum, LF=Linear Feet, CY=Cubic Yards, SY = Square Yards, SF = Square Feet, AC = Acre, TN =Ton

Unit Price Total

Brush Creek Site 15 Dam Rehabilitation Bid Schedule

Item Bid Item Description Spec. Section Estimated Quantity

Unit

Revised BC Site 15 Bid Schedule - 12/30/25

(210-VI-NEH, May 2001) 21-1

CONSTRUCTION SPECIFICATION 21—EXCAVATION

Scope The work shall consist of the excavation required by the drawings and specifications and disposal of the excavated materials.

Classification Excavation is classified as common excavation, rock excavation, or unclassified excavation in accordance with the following definitions.

Common excavation is defined as the excavation of all materials that can be excavated, transported, and unloaded using heavy ripping equipment and wheel tractor-scrapers with pusher tractors or that can be excavated and dumped into place or loaded onto hauling equipment by excavators having a rated capacity of one cubic yard or larger and equipped with attachments (shovel, bucket, backhoe, dragline, or clam shell) appropriate to the material type, character, and nature of the materials.

Rock excavation is defined as the excavation of all hard, compacted, or cemented materials that require blasting or the use of ripping and excavating equipment larger than defined for common excavation. The excavation and removal of isolated boulders or rock fragments larger than 1 cubic yard encountered in materials otherwise conforming to the definition of common excavation shall be classified as rock excavation. The presence of isolated boulders or rock fragments larger than 1 cubic yard is not in itself sufficient cause to change the classification of the surrounding material.

For the purpose of these classifications, the following definitions shall apply:

Heavy ripping equipment is a rear-mounted, heavy duty, single-tooth, ripping attachment mounted on a track type tractor having a power rating of at least 250 flywheel horsepower unless otherwise specified in Section 10.

Wheel tractor-scraper is a self-loading (not elevating) and unloading scraper having a struck bowl capacity of at least 12 cubic yards.

Pusher tractor is a track type tractor having a power rating of at least 250 flywheel horsepower equipped with appropriate attachments.

Unclassified excavation is defined as the excavation of all materials encountered, including rock materials, regardless of their nature or the manner in which they are removed.

Blasting The transportation, handling, storage, and use of dynamite and other explosives shall be directed and supervised by a person(s) of proven experience and ability who is authorized and qualified to conduct blasting operations.

Blasting shall be done in a manner as to prevent damage to the work or unnecessary fracturing of the underlying rock materials and shall conform to any special requirements in Section 10 of this specification. When specified in Section 10, the Contractor shall furnish the Engineer, in writing, a blasting plan before blasting operations begin.

REVISED BC 15 CS Excavation - 12/30/25

(210-VI-NEH, May 2001) 21-2

Use of excavated material Method 1—To the extent they are needed, all suitable material from the specified excavations shall be used in the construction of required permanent earthfill or rockfill. The suitability of material for specific purposes is determined by the Engineer. The Contractor shall not waste or otherwise dispose of suitable excavated material.

Method 2—Suitable material from the specified excavations may be used in the construction of required earthfill or rockfill. The suitability of material for specific purposes is determined by the engineer.

Disposal of waste materials Method 1—All surplus or unsuitable excavated materials are designated as waste and shall be disposed of at the locations shown on the drawings.

Method 2—All surplus or unsuitable excavated materials are designated as waste and shall be disposed of by the Contractor at sites of his own choosing away from the site of the work. The disposal shall be in an environmentally acceptable manner that does not violate local rules and regulations.

Excavation limits Excavations shall comply with OSHA Construction Industry Standards (29CFR Part 1926) Subpart P, Excavations, Trenching, and Shoring. All excavations shall be completed and maintained in a safe and stable condition throughout the total construction phase. Structure and trench excavations shall be completed to the specified elevations and to the length and width required to safely install, adjust, and remove any forms, bracing, or supports necessary for the installation of the work. Excavations outside the lines and limits shown on the drawings or specified herein required to meet safety requirements shall be the responsibility of the Contractor in constructing and maintaining a safe and stable excavation.

Borrow excavation When the quantities of suitable material obtained from specified excavations are insufficient to construct the specified earthfills and earth backfills, additional material shall be obtained from the designated borrow areas. The extent and depth of borrow pits within the limits of the designated borrow areas shall be as specified in Section 10 or as approved by the Engineer.

Borrow pits shall be excavated and finally dressed to blend with the existing topography and sloped to prevent ponding and to provide drainage.

Over excavation Excavation in rock beyond the specified lines and grades shall be corrected by filling the resulting voids with portland cement concrete made of materials and mix proportions approved by the engineer. Concrete that will be exposed to the atmosphere when construction is completed shall meet the requirements of concrete selected for use under Construction Specification 31, Concrete for Major Structures, or 32, Structure Concrete, as appropriate.

Concrete that will be permanently covered shall contain not less than five bags of cement per cubic yard. The concrete shall be placed and cured as specified by the Engineer.

Excavation in earth beyond the specified lines and grades shall be corrected by filling the resulting voids with approved, compacted earthfill. The exception to this is that if the earth is to become the subgrade for riprap, rockfill, sand or gravel bedding, or drainfill, the voids may be filled with material conforming to the specifications for the riprap, rockfill, bedding, or drainfill.

Before correcting an over excavation condition, the Contractor shall review the planned corrective action with the Engineer and obtain approval of the corrective measures.

(210-VI-NEH, May 2001) 21-3

Measurement and payment

For items of work for which specific unit prices are established in the contract, the volume of each type and class of excavation within the specified pay limits is measured and computed to the nearest cubic yard by the method of average cross-sectional end areas or by methods outlined in Section 10 of this specification. Regardless of quantities excavated, the measurement for payment is made to the specified pay limits except that excavation outside the specified lines and grades directed by the Engineer to remove unsuitable material is included. Excavation required because unsuitable conditions result from the Contractor's improper construction operations, as determined by the Engineer, is not included for measurement and payment.

Method 1—The pay limits shall be as designated on the drawings.

Method 2—The pay limits shall be defined as follows:

a. The upper limit shall be the original ground surface as it existed before the start of construction operations except that where excavation is performed within areas designated for previous excavation or earthfill, the upper limit shall be the modified ground surface resulting from the specified previous excavation or earthfill.

b. The lower and lateral limits shall be the neat lines and grades shown on the drawings.

Method 3—The pay limits shall be defined as follows:

a. The upper limit shall be the original ground surface as it existed before the start of construction operations except that where excavation is performed within areas designated for previous excavation or earthfill, the upper limit shall be the modified ground surface resulting from the specified previous excavation or earthfill.

b. The lower and lateral limits shall be the true surface of the completed excavation as directed by the engineer.

Method 4—The pay limits shall be defined as follows:

a. The upper limit shall be the original ground surface as it existed before the start of construction operations except that where excavation is performed within areas designated for previous excavation or earthfill, the upper limit shall be the modified ground surface resulting from the specified previous excavation or earthfill.

b. The lower limit shall be at the bottom surface of the proposed structure.

c. The lateral limits shall be 18 inches outside of the outside surface of the proposed structure or shall be vertical planes 18 inches outside of and parallel to the footings, whichever gives the larger pay quantity, except as provided in d below.

d. For trapezoidal channel linings or similar structures that are to be supported upon the sides of the excavation without intervening forms, the lateral limits shall be at the underside of the proposed lining or structure.

e. For the purposes of the definitions in b, c, and d, above, any specified bedding or drainfill directly beneath or beside the structure will be considered to be a part of the structure.

All methods—The following provisions apply to all methods of measurement and payment.

Payment for each type and class of excavation is made at the contract unit price for that type and class of excavation. Such payment will constitute full compensation for all labor, materials, equipment, and all other items necessary and incidental to the performance of the work except that extra payment for backfilling over excavation will be made in accordance with the following provisions.

(210-VI-NEH, May 2001) 21-4

Payment for backfilling over excavation, as specified in Section 8 of this specification, is made only if the excavation outside specified lines and grades is directed by the Engineer to remove unsuitable material and if the unsuitable condition is not a result of the Contractor's improper construction operations as determined by the Engineer.

Compensation for any item of work described in the contract, but not listed in the bid schedule is included in the payment for the item of work to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in Section 10 of this specification.

NRCS – 05/25

Brush Creek Site 15 Dam (WV05511) Rehabilitation Project 21-5

Items of work and construction details Items of work to be performed in conformance with this specification and construction details are:

A. General

1) The Contractor is required to submit an Excavation Plan to the COR at least 45 days prior to beginning work activity. The Excavation Plan shall contain the following, at a minimum:

a. Description of the Contractor’s proposed work sequence and schedule, as well as plans for creating stockpiles.

b. Stockpile locations within the approved staging areas shown on the Drawings. All stockpile areas are to be located outside of the 100-yr floodplain.

c. Plans and diagrams for handling excavation, earthfill, and spoil materials.

d. Protection of stockpiles.

e. Haul routes.

f. Makes, models, and quantities of proposed excavating and hauling equipment;

excavation proposed for the Contractor’s convenience.

g. Means and methods for protection of structures to remain, including but not limited to the principal spillway conduit.

h. Means and methods for protection of existing embankment fill materials to remain.

i. Means and methods for drying excavated wet soils prior to stockpiling and/or reuse as earthfill.

j. Sequencing of embankment toe drain excavation. Provide detailed narrative describing proposed approach to completing the Phase 1 excavation, segmental excavations, and backfilling as required below.

2) An Excavation Dewatering Plan shall be provided with the Excavation Plan, as specified in Construction Specification 11, Removal of Water. A Fill Placement Plan shall also be provided with the Excavation Plan, as specified in Construction Specification 23, Earthfill.

These three plans shall be coordinated. A Foundation Preparation Plan shall also be provided with the Excavation Plan, as specified in Construction Specification 63, Treatment of Rock Surfaces.

3) In addition, Excavation shall be performed within the following tolerances:

a. Common excavation, plus or minus 0.1 feet from plan line and grade.

b. For foundations of concrete structures, plus 0.1 feet to minus 0.5 feet.

4) In Section 2, Classification, Common Excavation is described in the bid items below. There will be small areas that are to be excavated below the common excavation limits where rock may be encountered. The most likely places where rock may be encountered include but is not limited to trenching in cutoffs for structures such as the impact basin and tailwater weir wall. Any rock excavation, if encountered, would be paid for under line item 10 – Embankment, Common Excavation, and line item 11 – Auxiliary Spillway, Common Excavation respectively.

B. Bid Item 10 – Embankment, Common Excavation

1) The item consists of excavation of material (after stripping) within the limits of embankment toe drain excavation, including excavations for the principal spillway conduit extension, impact basin, and precast seepage collection boxes, to the depths and grades shown on the Drawings or as directed by the COR.

2) The design intent is for the embankment toe drain excavation to extend to the bottom of the materials meeting the requirements for Common Excavation as defined in Section 10.B.9).

Brush Creek Site 15 Dam (WV05511) Rehabilitation Project 21-6

The bottom of the toe drain excavation shall terminate at the top of materials meeting the requirements for Rock Excavation as defined in Section 2. Additional requirements are provided as notes and details on the Drawings.

3) Any heavy, mechanized excavation equipment used to perform excavation around the existing principal spillway conduit and concrete cradle shall not be closer than 5 feet from the structure all times, unless otherwise shown on the Drawings. The Contractor shall repair any damages to the existing principal spillway conduit and concrete cradle resulting from the Contractor's improper construction operations as determined by the COR at no cost to the Government.

4) Suitable materials resulting from the required excavations shall be used to construct the specified fills and shall be stockpiled at the approved staging areas shown in the Contractor’s approved Excavation Plan or designated by the COR. Unsuitable materials shall be placed in on-site waste areas designated by the COR.

5) The Contractor is required to sequence the excavation such that excavations below the Phase 1 excavation subgrade elevation shown on the Drawings are completed in segments not to exceed 50 linear feet in length. Backfill to the Phase 1 excavation subgrade prior to beginning the next segment.

6) If during excavation, groundwater is encountered, excavation operations shall cease, the excavation shall be stabilized, and excavation shall not continue until the area is dewatered to the required depth, as specified in Construction Specification 11, Removal of Water.

7) Meet the requirements of Construction Specification 63, Treatment of Rock Surfaces.

8) Contractor shall coordinate embankment backfilling activities with any planned winter shutdowns. The schedule provided in the Excavation Plan shall indicate the proposed target earthfill subgrade elevation prior to commencement of any winter shutdown.

9) In Section 2 – Classification, excavation is classified as Common Excavation. Heavy ripping equipment and Pusher tractor are re-defined as having a power rating of at least 150 flywheel horsepower.

10) In Section 3 – Blasting, blasting is prohibited.

11) In Section 4 – Use of Excavation Material, Method 1 will apply. Suitable materials resulting from these excavations shall be used as onsite Earthfill, as approved by the COR. Soil resulting from these excavations that is wet or saturated does not, in and of itself, constitute unsuitable material. Unsuitable material will be determined by the COR, The Contractor is responsible to manage wet soils, separate from dry soils, and moisture condition wet or dry soils for reuse as earthfill within the project activity time requirements. The Contractor will be permitted to stockpile excavated materials only within the approved staging areas shown in the Contractor’s Excavation Plan. The excavated material shall be protected for re-use in a manner that will minimize contamination and moisture absorption, as approved by the COR.

Stockpiled excavated materials shall meet the soil erosion and sediment control requirements stated on the drawings and in Construction Specification 5, Pollution Control.

12) In Section 5 – Disposal of Waste Materials, Method 1 will apply. Disposal of any excess soil materials from excavations shall be as specified in Construction Specification 23, Earthfill, Bid Item 12, Earthfill. On-site disposal will be allowed in the embankment downstream toe berm as shown on the Drawings or in the staging areas shown on the Drawings or as allowed by the COR in writing.

13) In Section 6 – Excavation Limits, Embankment Excavation shall be performed as shown on the Drawings. The Contractor shall furnish, put in place, and maintain any required trench boxes, supports, and bracing required to support the sides of the excavation and prevent loss of ground that could damage or delay the work or endanger adjacent structures. Driven sheet piles for excavation support will not be permitted. The excavation limits shown on the Drawings are neat lines for payment quantities. The Contractor is responsible for determining

Brush Creek Site 15 Dam (WV05511) Rehabilitation Project 21-7 excavation limits to comply with OSHA Construction Industry Standards (29CFR Part 1926) Subpart P, Excavations, Trenching, and Shoring, as well as the NRCS Supplement to OSHA.

14) In Section 8 – Over excavation

a. The estimated depth and extent of excavation is shown on the Drawings. During the progress of the work, the slopes, grades, or dimensions of the excavations may require adjustment from those shown on the plans or specified herein based on conditions encountered in the field.

b. All necessary precautions shall be taken to preserve the material below and beyond the indicated or specified lines of all excavations in the best possible condition. Any and all excess excavation for the convenience of the Contractor or over excavation performed by the Contractor for any purpose or reason except as may be ordered in writing by the COR shall be at the expense of the Contractor. Where required to complete the work, all such excess excavation and over excavation shall be refilled at the expense of and by the Contractor.

c. Backfill materials for use in areas of over excavation shall be as directed by the COR.

Where earth backfill is used, over excavation shall be backfilled to the moisture and density specified for Earthfill in Construction Specification 23, Earthfill.

d. Following foundation preparation, the COR shall visually observe the foundation subgrades. The Contractor shall remove any unsuitable soils, as determined by the COR, and replace with suitable material as directed by the COR. Subgrades that have been properly dewatered in accordance with Construction Specification 11, Removal of Water and exhibit soft, loose, or weakened conditions shall be removed and replaced at the direction of the COR and will be paid for in accordance with Section 9. Subgrades and excavation slopes that have become loosened or weakened requiring removal and replacement due to lack of proper dewatering shall be removed and replaced as directed by the COR at no additional cost to the Government. The COR will be the sole judge of whether subgrades have been properly dewatered.

15) In Section 9 – Measurement and Payment, Method 3 shall apply. The neat lines and grades shown on the Drawings shall be considered the true surface of the completed excavation unless otherwise approved by the COR. After the limits of excavation shown on the Drawings are complete, the COR will examine the completed surface and mark areas that need additional excavation to remove unsuitable materials. The Contractor shall survey the completed limits of excavation for quantity calculations.

a. Measurement and Payment for quality control and testing in the section will be made under Bid Item 44 – Construction Quality Control in Construction Specification 94 – Construction Quality Control

C. Bid Item 11 – Auxiliary Spillway, Common Excavation

1) The item shall consist of excavation of material (after stripping) within the limits of the auxiliary spillway to the depths and grades shown on the Drawings or as directed by the

COR.

2) The design intent is for the auxiliary spillway excavation is to excavate materials meeting the requirements for Common Excavation as defined in Section 2 and to terminate at the lines and grades shown on the Drawings, unless the COR directs additional excavation be performed to remove unsuitable materials as defined herein.

3) Specified requirements for Bid Item 10 – Embankment, Common Excavation apply to this Bid Item, except as modified below:

Brush Creek Site 15 Dam (WV05511) Rehabilitation Project 21-8

a. In Section 2 – Classification, excavation is classified as Common Excavation. Heavy ripping equipment and Pusher tractor are defined as having a power rating of at least 150 flywheel horsepower.

b. In Section 6 – Excavation Limits, Auxiliary Spillway Excavation shall be performed as shown on the Drawings within the Auxiliary Spillway. The Contractor shall furnish, put in place, and maintain sheeting and bracing required to support the sides of the excavation and prevent loss of ground that could damage or delay the work or endanger adjacent structures.

4) In Section 9 – Measurement and Payment, Method 3 shall apply. The neat lines and grades shown on the drawings shall be considered the true surface of the completed excavation unless otherwise approved by the COR. After the limits of excavation shown on the drawings are complete, the COR will examine the completed surface and mark areas that need additional excavation to remove unsuitable materials. The Contractor shall survey the completed limits of excavation for quantity calculations.

a. Measurement and Payment for quality control and testing in the section will be made under Bid Item 44 – Construction Quality Control in Construction Specification 94 – Construction Quality Control

D. Subsidiary Item, Miscellaneous Excavation

1) This item consists of all excavation required for constructing the auxiliary spillway riprap wave protection, embankment toe drain outlet pipe, auxiliary spillway drain cleanouts, outlet channel rock riprap, surface completions for geotechnical instrumentation, and other miscellaneous structures shown on the Drawings.

2) In Section 3, Blasting, blasting will not be permitted.

3) In Section 4, Use of Excavated Materials, Method 1 shall apply.

4) In Section 5, Disposal of Waste Materials, Method 1 shall apply. Disposal of any excess soil materials from excavations shall be as specified in Construction Specification 23, Earthfill, Bid Item 12, Earthfill. On-site disposal will be allowed in the embankment downstream toe berm as shown on the Drawings or in the staging areas shown on the Drawings or as allowed by the COR in writing.

5) In Section 9 – Measurement and Payment, no separate payment will be made for this item of work. Compensation for this item will be included in the payment for:

a. Construction Specification 45, Bid Item 27, Toe Drain Piping

b. Construction Specification 45, Bid Item 29, ASW Drain Piping

c. Construction Specification 61, Bid Item 30, Rock Riprap, PSW Outlet and ASW Entrance

d. Construction Specification 401, Bid Item 46, Geotechnical Instrumentation

**End of Construction Specification 21**

(210-VI-NEH, Amend. 2, Sept. 2018) 61-1

CONSTRUCTION SPECIFICATION 61—ROCK RIPRAP

Scope The work consists of the construction of rock riprap revetments and blankets, including filter or bedding where specified.

Material Rock riprap must conform to the requirements of Material Specification 523, Rock for Riprap, or if so specified, must be obtained from designated sources. It must be free from dirt, clay, sand, rock fines, and other material not meeting the required gradation limits.

At least 30 days before rock is delivered from other than designated sources, the Contractor must designate in writing the source from which rock material will be obtained and provide information satisfactory to the Contracting Officer that the material meets contract requirements. The Contractor must provide the responsible Engineer free access to the source for the purpose of obtaining samples for testing. The size and grading of the rock must be as specified in Section 8.

Rock from approved sources must be excavated, selected, and processed to meet the specified quality and grading requirements at the time the rock is installed.

Based on a specific gravity of 2.65 (typical of limestone and dolomite) and assuming the individual rock is shaped midway between a sphere and a cube, typical size/weight relationships are:

Sieve size of rock

Approx. weight of rock

Weight of test pile

16 inches 300 pounds 6,000 pounds

11 inches 100 pounds 2,000 pounds

6 inches 15 pounds 300 pounds

When specified in Section 8 or when it is necessary to verify the gradation of the rock riprap, a particle size analysis must be performed in accordance with ASTM D5519, Test Method A or B.

The analysis must be performed at the work site on a test pile of representative rock. The mass of the test pile must be at least 20 times the mass of the largest rock in the pile. The results of the test are compared to the gradation required for the project. Test pile results that do not meet the construction specifications must be cause for the rock to be rejected. The test pile that meets contract requirements must be left on the job site as a sample for visual comparison. The test pile must be used as part of the last rock riprap to be placed.

Filter or bedding aggregates when required must conform to Material Specification 521, Aggregates for Drainfill and Filters, unless otherwise specified. Geotextiles must conform to Material Specification 592, Geotextile.

Subgrade preparation The subgrade surface on which the rock riprap, filter, bedding, or geotextile is to be placed must be cut or filled and graded to the lines and grades shown on the…