Amendment #1 Little Gypsum Mine Safety Closure Project.pdf

1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us John W. Hickenlooper, Governor | Robert Randall, Interim Executive Director | Virginia Brannon, Director

DATE: June 30, 2017

TO: All Bidders on the Little Gypsum Mine Safety Closure Project

FROM: Jeff Litteral, Division of Reclamation, Mining & Safety

RE: Amendment No. 1 to 2017 - 0293

Thank you for your attendance at the Pre-Bid Meeting. The Bid Submittal will be due Wednesday July 12 at 4:00 p.m. The Bid Opening will be 10:00 am, Thursday, July 13. A REVISED Bid Schedule is attached to this amendment.

Please Note: Bids must be submitted and will only be accepted as sealed bids in single copy for the work described in the original bid document, and as detailed in this amendment and will be received until the date and time specified above at the Colorado Division of Reclamation, Mining and Safety, 1313 Sherman Street, Suite 215, Denver, Colorado 80203. Bids may ONLY be mailed, hand delivered, or sent via fed-ex, UPS, or other courier service. Faxed or emailed bids will NOT be accepted. Due to VSS Issues, the system is temporarily unable to accept bids electronically.

The following clarifications and amendments should be noted and incorporated into the bid documents:

1. Additional requirements to the Safety, Health and Environmental (SHEAP) Plan’s

Uranium Mine Site Work Safety Procedures are listed below.

The SabreAlert® Breathing Zone Monitor (BZM) radon detector or equivalent must be in operation and functioning during work being conducted at any mine entrance. If the BZM unit or equivalent is not in operation the CONTRACTOR must contact the PROJECT MANAGER. The highest radon daily measurement will be recorded on the Daily Work Site Logs in addition to the amount of exposure time each worker spends at the mine entrance.

The Radon and Gamma Log sheet must be completed and returned to the PROJECT MANAGER prior to final inspection of the Project.

Any radon reading greater than 0.1 Working Level must be mitigated using one of the following measures and method utilized recorded on the Daily Work Site Logs.

(1) substitution or elimination of the hazardous agent (e.g., via construction of ventilation barriers, installation of brattice cloth)

(2) engineering controls (e.g., local exhaust ventilation, process enclosure, dilution ventilation), http://mining.state.co.us/

(3) administrative controls (e.g., limiting time of exposure, employee training, work practices)

Please modify the reference in the SHEAP regarding the use of Self Contained Breathing Apparatus (SCBA) at sites with Radon monitoring exposure levels of greater than 5 Working Levels to address the above listed controls instead.

The CONTRACTOR will be responsible for the security and maintenance of the BZM or equivalent device while in their possession.

The radon and gamma initial log will be provided to the awarded CONTRACTOR to provide the radon and gamma data for the project. The radon and gamma log will include the highest radon readings for each feature and the final log must be submitted prior to approval of final invoice. NOTE: No initial radon measurements were collected for this project. For all features which will be mechanically backfilled using a piece of equipment fitted with an enclosed cab and functional air conditioner, radon progeny measurements are not required.

2. Note that Props may be necessary and required to support incompetent or poor back at many locations.

3. Scaling of loose, fractured or broken rock must be accomplished where necessary by a competent person, preferably someone trained to do so and certified by MSHA.

4. Anchoring and fall protection is required for all activities taking place at or adjacent to any ledge greater than 12 inches in height. The use of anchoring and PPE, including ropes and harnesses, must be addressed in the required SHEAP submittal.

5. In the event fire restrictions are in place on U.S. Bureau of Land Management properties at the time of construction – All applicable restrictions and practices prohibited in the field will apply unless fire conditions change. PROJECT MANAGER will notify CONTRACTOR if conditions warrant any restrictions.

6. The following clarifications are made to the following features:

All features with bat grates will include an access door per Standard Drawings 5 and 6 sheet 2, with the exception of features 458 S1 and 956 A2. All 36” X 20’ CSP’s can be substituted with 48” X 20’ – contractor’s option.

#3040 S1 – Grate only, not enough backfill material for backfill. Excavate timber frame and pin grate to bedrock. Wood from timber frame can be stacked on-site.

Features: 416 A2, 416 A3, 451 A1, 454 A1, 464 A1, - Backfill trench or pit areas with on-site waste rock to ground surface to mitigate high wall danger. Feature 416 A2 use topsoil stockpile for final surface seedbed and also include excavating a 50 foot long, 3 foot wide by 2 feet deep trench to intercept surface runoff.

#452 A1 – Archaeological restrictions include both conical waste rock piles at the site.

Additional backfill must be trammed from waste rock pile 300’ to the northwest.

#455 A1/A2 – Install CSP’s per specifications, band the two CSP’s for 455 A1 and A2 with Y pipe and band to an additional 10’ CSP with bat grate and access door. Backfill CSP’s in trench area with waste rock material. Include additional costs on Bid Schedule on line for feature #455 A1.

#461 A1 and A2 – Contractors option – CSP as specified in original bid document or Bulkhead with CSP per SWS 14 with bat grate and access door, Drawing 6 sheet 2.

Circle option preferred on REVISED Bid Schedule.

#Features 464 A1, 465 A1, 465 A2 - remove and properly dispose of T-posts and barbed wire.

7. The Mine Site Field Forms of all the mine sites will be emailed by the PROJECT

MANAGER and mailed with amendment. (NOTE: do not refer to closure method on MSFF, use the closure method on the revised bid schedule.) The Draft Bid Specification and pictures of the strapping and wire rope netting required are attached. Please note, alternative methods of wire rope netting must be approved by Project Manager prior to installation.

8. For all features where a Bat Exclosure will be constructed prior to closing the feature

(3040 A1, 3040 S1, 3041 S1, 3045 A1, 3048 P1, 451 A1, 454 A1, 458 P1, 463 A2) change the length of time for the bat exclosure to be left in place from a minimum of three days and nights prior to the start of mine safeguarding construction to seven days and nights.

9. Features 416 A1, 450 A1, 455 A1, 462 A1 were identified as priority bat habitat and closures must be completed by October 31, 2017.

10. Revegetation costs will include revegetation of equipment tracks on non-established two-tracks. Estimated length of 2.5 miles or 2.25 acres.

All terms and conditions of the Invitation for Bid other than as changed by this amendment remain the same.

Receipt and acceptance of this amendment shall be acknowledged on the bid form and by submitting the Revised Bid Schedule.

Little Gypsum Mine Safety Closure Project

2017 - 0293

**REVISED Bid Schedule**

6/30/2017

ITEM

DESCRIPTION

QTY

UNIT

UNIT

PRICE

FUNDING

AMOUNT

A. Pre-Qualification 1 Job N/A N/A N/A

1.

Mobilization/

Demobilization 1 Job N/A

OSM

2. Project SHEAP 1 Job N/A

3. Revegetation 1 Job N/A

4.

Install Mine Safety Closures 1 Job N/A

BLM $___________________

5.

Additional Excavator

Time * 16 Hours $______/hr

GRAND TOTAL (Enter here and on Invitation and Bid Sheet) $__________________

* Bid Item 5 is NOT GUARANTEED

DO NOT AMEND ANY PART OF THIS BID SCHEDULE

ALL PAGES OF THIS BID SCHEDULE MUST BE RETURNED

ALL LINES ITEMS MUST BE COMPLETED

Page 1 of 3 Page(s)

Item 4 - Install Mine Closures:

Feature

ID

Feature Type

Closure Methods

Bid Amount

County

Funding

3040 A1 Adit/Decline Backfill

San Miguel BLM

3040 S1 Shaft Grate

3041 S1 Shaft Polyurethane Foam

San Miguel BLM

3045 A1 Adit Backfill

Montrose BLM

3045 A2 Adit/Decline Grated Corrugated Steel Pipe

Montrose BLM

3045 V1 Vent shaft Grate

Montrose BLM

3048 P1 Prospect Adit Backfill and PUF

San Miguel BLM

416 A1 Adit/Decline Grated Corrugated Steel Pipe

San Miguel BLM

416 A2 Adit/Decline Backfill

San Miguel BLM

416 A3 Adit/Decline Backfill

San Miguel BLM

450 A1 Adit/Decline Grated Corrugated Steel Pipe

Montrose BLM

451 A1 Adit/Decline Backfill

Montrose BLM

452 A1 Adit/Decline Grated Corrugated Steel Pipe

Montrose BLM

454 A1 Adit/Decline Backfill

Montrose BLM

455 A1 Adit Grated Corrugated Steel Pipe

Montrose BLM

455 A2 Adit/Decline Grated Corrugated Steel Pipe

Montrose BLM

455 A3 Adit Backfill

Montrose BLM

456 A1 Adit Grated Corrugated Steel Pipe

Montrose BLM

458 A1 Adit Cable Net

Montrose BLM

458 P1 Prospect Adit Backfill

Montrose BLM

458 P2 Prospect Adit Backfill

Montrose BLM

458 S1 Shaft Grated Corrugated Steel Pipe

Montrose BLM

459 A1 Adit Backfill

Montrose BLM

DO NOT AMEND ANY PART OF THIS BID SCHEDULE

459 A2 Adit Grated Adit

Montrose BLM

460 A1 Adit/Decline Grated Corrugated Steel Pipe

Montrose BLM

460 A2 Adit/Decline Grated Corrugated Steel Pipe

Montrose BLM

461 A1 Adit/Decline Grated Corrugated Steel Pipe OR Bulkhead Circle preferred option.

461 A2 Adit/Decline Grated Corrugated Steel Pipe OR Bulkhead Circle preferred option.

SUB1

Subsidence Feature

Polyurethane Foam

Montrose BLM

SUB2

Subsidence Feature

Polyurethane Foam

Montrose BLM

462 A1 Adit/Decline Grated Corrugated Steel Pipe

Montrose BLM

462 V1 Vent shaft Grate

Montrose BLM

463 A1 Adit/Decline Backfill

Montrose BLM

463 A2 Adit/Decline Backfill

Montrose BLM

464 A1 Adit/Decline Backfill

Montrose BLM

465 A1 Adit/Decline Grated Corrugated Steel Pipe

Montrose BLM

465 A2 Adit/Decline Grated Adit

Montrose BLM

929 A1 Adit/Decline Grated Corrugated Steel Pipe

Montrose BLM

929 A2 Adit/Decline Grated Corrugated Steel Pipe

Montrose BLM

929 A3 Adit/Decline Grated Corrugated Steel Pipe

Montrose BLM

956 A1 Adit/Decline Grated Corrugated Steel Pipe

San Miguel BLM

956 A2 Prospect Pit Grated Corrugated Steel Pipe

San Miguel BLM

956 A3 Adit/Decline Grated Corrugated Steel Pipe

TOTAL (Enter here and on Pg 1 of Bid Schedule, Item 4) $__________________

Page 3 of 3 Page(s)

Colorado Department of Natural Resources Division of Mining, Reclamation, and Safety

Inactive Mine Reclamation Program

General Bid Specifications – March 2009 Page 16-1 Standard Work Specifications

Section 16

WIRE ROPE NETTING CLOSURE

16.1 DESCRIPTION

This work shall consist of installing a wire rope netting closure within an adit or over a shaft or stope, including clearing and grubbing, excavation of loose material, trimming of the adit or shaft, furnishing and securing the cable netting, project signage, monumentation, erosion control and revegetation of disturbed areas in accordance with these specifications and Standard Drawing Nos 6 and 13.

16.2 RELATED WORK

Section 20 – Revegetation Section 21 – Project Sign Section 22 – Erosion Control

16.3 REFERENCE DOCUMENTS

Standard Drawing No. 6 Sheet 1.

ASTM C150 – Standard Specification for Portland Cement.

ASTM C387 – Standard Specification for Packaged, Dry, Combined Materials for Mortar and Concrete.

ASTM D2104 – Standard Specification for Polyethylene (PE) Plastic Pipe, Schedule 40.

16.4 MATERIALS

Aircraft cable shall consist of single length of 1/4", 7 x 7-14 preformed galvanized aircraft cable, 7,000 pounds tensile strength.

Swaged cable clamps shall be brass, stainless or non-corrosive metal, and swaged to the cable in the net "weaving" process. Brass oval sleeve clamps or galvanized/plated steel wire rope clamps will be used in creating the cable end loops.

Rock bolts shall be expansion-type with a minimum pullout strength of 2,000 pound at an embedment depth of 4.5 inches. The anchor bolts shall be Hilti Heavy Duty Expansion Anchor, Kwik bolt or equivalent eye-type anchor bolt.

Anchor Bars shall be Number 6 (3/4") rebar in accordance with ASTM A 615, grade 60, anchored a minimum depth of 8 inches (8") into competent rock with Moly Parabond capsule or equivalent, or as interference fit in drilled holes in solid rock.

Cement shall be Type II Portland cement, conforming to ASTM C-150, unless otherwise approved by

PROJECT MANAGER.

Strapping shall be two inch by three eights inch (2" x 1/4") steel.

Water shall be potable.

16.5 EXECUTION

16.5.1 Fabrication

The 1/4" aircraft cable shall be woven in a grid with six inch (6") openings, unless a bat accessible opening is specified, in which case, 6" x 24" metal framed openings will be required to allow bats to pass through the net. At all points of steel cable intersections, swaged cross cable clamps shall be placed to hold the

Colorado Department of Natural Resources Division of Mining, Reclamation, and Safety

Inactive Mine Reclamation Program

General Bid Specifications – March 2009 Page 16-2 Standard Work Specifications steel cables in position. After threading through the eyes of the anchor pins, these clamps will be swaged to the cable to provide a permanent connection. Every other cable along the exterior edge of the net shall be looped over and clamped to itself using brass, or stainless steel oval sleeve clamps, or galvanized/plated wire rope clips to form a loop for attachment to an anchor. If wire rope clips are used, the nuts shall be tack welded after tightening.

16.5.2 Installation

Anchor bars shall be installed at a minimum of twelve inch (12”) centers, unless soft or unstable rock is encountered, but shall not exceed eighteen inches (18”). Strapping shall be welded to the anchor bars to enclose the perimeter of the mine void. All voids larger than one inch (1") shall be filled with concrete mix or pieces of welded grating, steel strapping or angle iron to fill the void. The concreted area shall be a minimum of twelve (12") inches in width. Where gaps between the grating and bedrock exceed six inches (6"), a grouted durable rock wall with a minimum width of eighteen inches (18") shall be constructed.

The exception to the eighteen inch (18”) centers will be on the mine floor for the bottom strapping, which must be anchored every twelve (12) inches into competent rock. If the floor of the entry is not competent rock, the base of the strapping is to be anchored to a twelve inch (12") wide, poured concrete footing, twelve inches (12") deep, across the entire width of the adit which shall incorporate Number 6 rebar anchors on one foot (1') centers. If competent rock is greater than three feet (3') below grade, the bottom of the footing shall be placed a minimum of three feet (3') below grade.

The strapping shall be threaded through the wire rope netting and loose ends looped through the strapping or trimmed and must provide complete coverage of the mine opening.

16.5.3 Drainage Berms

Drainage berms shall be constructed of uncompacted waste rock or excavated material to direct runoff away from the opening. All areas including access routes and work areas that are disturbed by CONTRACTOR shall be revegetated according to the Revegetation specifications.

16.5.4 Monument

A three-inch (3") I.D. (inside diameter) four-inch (4") long galvanized pipe shall be welded to the outside of the strapping. A brass cap shall be grouted flush to ¼” below the top of the pipe, using a non-shrink grout or adhesive, such as Moly Parabond, Pour Rock or QUIKRETE. OR A brass cap shall be anchored into competent rock within the perimeter of the closure. A hole shall be drilled into competent rock, then a brass cap (supplied by OWNER) shall be grouted using a non-shrink grout such as Moly Parabond, QUIKRETE, or Pour Rock.

16.5 MEASUREMENT AND PAYMENT

No measurement for payment shall be made for these bid items. Payment shall be for the lump-sum bid price. The price bid shall include all of CONTRACTOR's cost of whatever nature to provide a complete closure installation in accordance with the plans and specifications including materials, fabrication of the cable netting closure, excavation, installation, and revegetation of disturbed areas.