Bullion King Mine Waste Reclamation Project_Part2.pdf

TASK 5 CONSTRUCT RUN-ON CHANNELS

Channels will be constructed on the west side above the repository area to convey stormwater and snowmelt around the mine waste areas and the proposed repository. Approximately 700 linear feet of channel will be constructed in this task. All native materials excavated for construction of the channels will be stockpiled on site for use in final grading of the site. The channel will be two feet wide (2') at the base, and two feet (2') deep by approximately 700 feet long. Side slopes will be no steeper than 2H : 1V. Rock-breaking may be required to install the channels. The PROJECT MANAGER will stake the centerline of the channel in the field prior to construction.

Measurement and Payment

Measurement for this task will be made at the unit prices established in Item 5 of the Bid Schedule.

Measurement for payment will be made to the nearest linear foot of channel constructed. The prices bid for channel construction will cover all costs for completing the activities required under this task. Payment will be approved by the PROJECT MANAGER upon completion of each task.

Such payment will be considered full compensation for all labor, materials, equipment, and all other items necessary and incidental to the completion of Task 5. Payment for this task will be made only for the unit price shown under Item 5 of the Bid Schedule. Invoices are to be accompanied by Daily Job Logs summarizing the work included in the invoice.

TASK 6 STOCKPILE TOPSOIL

All topsoil and topsoil-like materials, as determined by the PROJECT MANAGER, located within the proposed repository area footprint will be collected and stored for use as cover soil over the completed repository. Topsoil will be excavated out of the repository area until the excavation reaches six feet (6') deep or topsoil materials are depleted, whichever occurs first, as determined by the PROJECT MANAGER. The topsoil stockpile may include large boulders, cobbles, and gravel, as determined by the PROJECT MANAGER.

The topsoil will be hauled to a temporary stockpile area immediately adjacent to the repository.

Once all of the salvaged topsoil is removed to the stockpile, erosion control Ertec S-fence will be installed around the perimeter under Bid Item 4.

The topsoil in the stockpile will be stored at slopes no steeper than two horizontal to one vertical (2H:1V).

The estimated amount of topsoil to salvage and stockpile is 2,000 cubic yards.

Measurement and Payment

Payment for this task will be made at the unit price established in Item 6 of the Bid Schedule. Measurement for payment will be made per cubic yard of topsoil stockpiled Payment for this task will be upon completion of stockpiling and upon approval of the PROJECT MANAGER. The completed stockpile will be surveyed in order to determine the volume of material moved. The OWNER will accomplish the survey work. Such payment shall be considered full compensation for collection and stockpiling of topsoil, and all labor, materials, equipment and all other items necessary and incidental to the completion of Bid Item 6.

TASK 7 EXCAVATE AND PLACE WASTE FROM BELOW ACCESS ROAD INTO

REPOSITORY

This task includes the removal of the waste rock from below the access road and outside of the repository boundary, transportation, and placement of the wastes in the on-site repository, located above the access road. See attached maps for excavation and placement locations. Excavation will occur within the areas outlined on the map, as directed by the PROJECT MANAGER.

There are approximately 2,000 cubic yards of waste materials below the access road. The depth of waste varies from six inches (6") to five feet (5') deep with an average depth of approximately 2 feet (2'). The mine waste below the access road is approximately 1/2 of an acre. Excavation below the road will be considered complete when all wastes have been excavated, exposing native soil materials and/or bedrock and placed into the repository. The PROJECT MANAGER will determine when the appropriate excavation depth has been achieved.

Placement/Grading of Mine Waste

Waste rock/mine waste materials will be placed in the upper repository, above the in-place mine waste above the access road. See attached map for waste placement location. The total area for mine waste placement is approximately 1/2 acre. The waste materials excavated and transported from the upper and lower waste dumps will be placed in one foot (1’) lifts and uniformly compacted through traffic or mechanical compaction, as approved by the PROJECT MANAGER. Compaction must be thorough enough that a shovel blade cannot easily penetrate the surface more than three inches (3”). The PROJECT MANAGER must approve lift compaction prior to placement of the next lift.

Upon completion of the final repository surface, including the top of the repository and associated side slopes, mine waste shall not be steeper than 3H:1V. The final surface of the waste materials will be graded to form small ridges and swales which mimic the surrounding landscape, while also maintaining positive drainage. The PROJECT MANAGER will work with CONTRACTOR to delineate ridge and swale locations in the field.

Excavation of the mine wastes will be considered complete when all mine waste and underlying materials have been removed and compacted into the repository, per PROJECT MANAGER approval. Any timbers or debris uncovered during excavation and transportation of the mine waste material will be set aside and removed by the CONTRACTOR to an authorized waste disposal facility.

Measurement and Payment

Measurement for payment for this task will be measured to the nearest cubic yard of mine waste excavated, transported, and placed in the disposal area. Payment for this task will be paid for at unit prices established in Item 7 of the Bid Schedule per cubic yard of mine waste excavated, transported, and placed. The repository surface will be surveyed in order to determine the volume of material moved. Such payment shall be considered full compensation for all labor, materials, equipment and all other items necessary and incidental to the excavation, transportation, and placement of mine wastes, as directed and described in the specifications. Payment will be as this task is completed and approved by the PROJECT MANAGER. Invoices are to be accompanied by Daily Job Logs summarizing the work included in the invoice.

TASK 8 REGRADE MINE WASTE ABOVE ROAD

The mine waste above the road consists of approximately 6,000 cubic yards of waste materials, with depths ranging from two feet (2’) to fifteen feet (15’), and an average depth of approximately eight feet (8’). The slopes of the waste are presently over-steepened at approximately 1H:1V or steeper. The mine waste above the access road will be left in place, but must be re-graded. The CONTRACTOR will be required to grade the mine waste to lessen slopes and consolidate all materials into the repository.

Upon completion of the final repository surface, including the top of the repository and associated side slopes, mine waste shall not be steeper than 3H:1V. The final surface of the waste materials will be graded to form small ridges and swales which mimic the surrounding landscape, while also maintaining positive drainage. The PROJECT MANAGER will work with CONTRACTOR to delineate ridge and swale locations in the field. It is estimated that 3/4 of an acre will be regraded and slopes lessened under this Bid Item.

Any timbers or debris uncovered during excavation and transportation of the mine waste material will be set aside and removed by the CONTRACTOR to an authorized waste disposal facility.

Measurement and Payment

Measurement for payment for this task will be measured to the nearest 1/10 of an acre of re-grading of mine waste above the access road. Payment for this task will be paid for at unit prices established in Item 8 of the Bid Schedule per acre of mine waste regraded. Such payment shall be considered full compensation for all labor, materials, equipment and all other items necessary and incidental to the regrading of mine wastes, as directed and described in the specifications.

Payment will be as this task is completed and approved by the PROJECT MANAGER. Invoices are to be accompanied by Daily Job Logs summarizing the work included in the invoice.

BID ITEM 9 CAP WASTE REPOSITORY WITH QUICK LIME KILN DUST (TOP 3')

The waste repository will be capped with a combination of waste rock materials mixed at a specified ratio with cement kiln dust (CKD). The approximate amount of CKD required is 720 tons.

The cement kiln dust amount is based on a repository cap area of approximately 45,000 square feet (45,000ft2). The approximate mixing ratio for CKD and fine-grained waste rock is 80 tons of CKD per 1,000 tons of fine-grained waste. The PROJECT MANAGER may change the mixing ratio of CKD and waste at any point during the project.

The CONTRACTOR is required to submit the kiln dust provider’s chemical analyses, including percent lime as CaCO3, of the specified CKD and the CKD provider’s name and contact information with their bid. Bids received without CKD chemical analyses or CKD provider’s name and contact information will be considered UNRESPONSIVE and the bid will be rejected. The minimum percent lime as CaCO3 required is 45 percent (45%).

A known provider of CKD is Holcim Cement Plant in Florence, Colorado. Please contact Holcim’s distributor, Kurt Bergner of TransPro at 1-866-434-2225. TransPro will be able to sell and deliver the CKD to Red Mountain Pass (Hwy 550). CKD may be delivered in pneumatic trucks or dump trucks. If the Bidder is unable to contact TransPro, please contact Roger Iverson of Holcim Cement Plant at (303) 406-1811.

The PROJECT MANAGER may deny the CKD provider if the chemical analyses are not compatible with project goals. Please contact Kirstin Brown, kirstin.brown@state.co.us, 970-903- 7889, prior to bid submittal with questions about CKD providers.

Mixing of CKD and waste rock will be completed in a stockpile area where excavator buckets of fine-grained waste rock and excavator buckets CKD can be mixed together at a specific ratio, thoroughly mixed and held at the stockpile for later placement on the repository surface.

After the mixing ratio of the CKD and waste rock has been achieved, the mixed materials will be spread out over the repository area in three one foot lifts (1’) and compacted in place with a sheepsfoot compactor. Exposed slopes of the repository will be no greater than three to one (3H:1V).

Measurement and Payment

Payment for this task will be made at the unit - price established in Item 9 of the Bid Schedule.

Measurement for payment will be made per ton of cement kiln dust procured, delivered and incorporated into the top three feet of the repository, including compaction of the material.

Payment for this task will be upon completion of installation and upon approval of the PROJECT MANAGER. Such payment shall be considered full compensation for all labor, materials, equipment and all other items necessary and incidental to the completion of Bid Item 9.

mailto:kirstin.brown@state.co.us

BID ITEM 10 CAP WASTE REPOSITORY WITH FLY ASK (TOP 6")

The final repository surface will be capped with a combination of waste rock materials mixed at a specified ratio with Type C Fly Ash. The approximate amount of Type C Fly Ash required is 900 tons. The Type C fly ash amount is based on a repository cap area of approximately 45,000 square feet (45,000ft2). The approximate mixing ratio for Type C Fly Ash and fine-grained waste rock is 100 tons of fly ash per 100 cubic yards of fine-grained waste. The PROJECT MANAGER may change the mixing ratio of Type C Fly Ash and waste at any point during the project.

The CONTRACTOR is required to submit the Type C Fly Ash provider’s chemical analyses and the Type C Fly Ash provider’s name and contact information with their bid. Bids received without Type C Fly Ash chemical analyses or provider’s name and contact information will be considered unresponsive and the bid will be rejected.

A known provider of Type C Fly Ash is Boral Materials. Please contact John Foster, Boral Materials Technologies, 303-883-0115, john.foster@boral.com, 14321 E 4th Ave, Suite 220, Aurora, CO 80011.

The PROJECT MANAGER may deny the Type C Fly Ash provider if the chemical analyses are not compatible with project goals. Please contact Kirstin Brown, kirstin.brown@state.co.us, 970-903- 7889, prior to bid submittal with questions about Type C Fly Ash.

Mixing of Type C Fly Ash and fine-grained waste rock will be completed in a stockpile area where excavator buckets of fine-grained waste rock and excavator buckets Type C Fly Ash can be mixed together at a specific ratio, thoroughly mixed and held at the stockpile for later placement on the repository surface.

After the mixing ratio of the Type C Fly Ash and fine-grained waste rock has been achieved, the mixed materials will be spread out over the repository area in one six inch (6”) lift and compacted in place with a sheepsfoot compactor. Exposed slopes of the repository will be no greater than three to one (3H:1V).

Measurement and Payment

Payment for this task will be made at the unit - price established in Item 10 of the Bid Schedule.

Measurement for payment will be made per ton of fly ash incorporated into the top six inches.

Payment for this task will be upon completion of installation and upon approval of the PROJECT MANAGER. Such payment shall be considered full compensation for all labor, materials, equipment and all other items necessary and incidental to the completion of Bid Item 10.

mailto:john.foster@boral.com mailto:kirstin.brown@state.co.us

TASK 11 COVER REPOSITORY WITH TOPSOIL

This task covers the placement and final grade of stockpiled topsoil on the repository. Following incorporation of cement kiln dust and fly ash over the repository surface, the topsoil will be distributed across the site at the PROJECT MANAGER's discretion. The exact amount of topsoil that can be stockpiled is unknown, so the exact depth of topsoil across the repository cap is unknown. It is estimated that as many as 2,000 cubic yards of topsoil, cobbles and gravel may be stockpiled under Bid Item 4. The repository may be covered with approximately one foot (1') of topsoil like materials over approximately 45,000 square feet (one acre).

This task includes grading repository areas to blend with surrounding landscape, and provide a scarified surface to preclude erosion and enhance revegation.

Measurement and Payment

Measurement for payment for this task will be measured to the nearest cubic yard of placed topsoil cover materials (combined coarse and fine) placed on the repository. Payment for this task will be paid for at prices established in Item 11 of the Bid Schedule per cubic yard of material placed on the repository. Such payment shall be considered full compensation for all labor, materials, equipment and all other items necessary and incidental to the placing of cover materials on the repository, as directed and described in the specifications. Payment will be as this task is completed and approved by the PROJECT MANAGER. Invoices are to be accompanied by Daily Job Logs summarizing the work included in the invoice.

TASK 12 FINAL GRADE OF EXCAVATION AREAS

This task includes grading the excavated areas to blend with the surrounding landscape, and provide an extremely scarified surface to preclude surface erosion.

All excavated areas will be graded so that, when completed, all cut slopes match the contour of immediately adjacent areas.

Surface scarfication must occur where bedrock is not exposed throughout the 1/2 acre excavation area of the mine waste below the access road.

Measurement and Payment

Measurement and payment for this task will be to the nearest 0.1 acre, and paid at the unit price bid on the Bid Schedule Item 12. The price bid should include all costs for labor, materials, equipment, and all other items necessary for placing cover, grading, and scarifying the excavated areas. Payment for this task will be made only for the unit price shown under Item 12 of the Bid Schedule. Payment shall be as this task is completed and approved by the PROJECT

MANAGER.

TASK 13 REVEGETATION

The ground surface of the repository and all disturbed areas, approximately 2 acres in size, will be severely scarified, following completion of Task 12.. The site will have a uniformly hummocky surface with hummocks constructed in an offset pattern, each having vertical relief of not less than eight inches (8") and spaced no less than one foot (1') apart horizontally. This will be done in order to minimize surface erosion, to promote the development of micro-climates on the reclaimed areas, and to improve growth medium potential.

Seed will be provided by the OWNER. The designated seed mix shall be uniformly hand broadcast on the prepared areas. Seeding shall not be done if the ground is frozen.

Approximately two acres will be revegetated. Seedbed preparation shall be suspended when soil moisture conditions are not suitable for the preparation of a satisfactory seedbed as determined by the PROJECT MANAGER.

Broadcast seeding shall be performed using hand operated or machine seeders whereby dry seed shall be applied in prescribed quantities uniformly on specified areas, then raked into the top two inches (2") of soil by hand. Broadcast seed shall be covered about one quarter (1/4) to one half (1/2) inch deep by flexible-tine harrowing or a similar method acceptable to the PROJECT MANAGER. One to two operations may be required to obtain adequate coverage as specified by the PROJECT MANAGER.

Additionally, under this Bid Item, the CONTRACTOR will procure, hand fluff, and spread 40 excelsior (aspen fibers) bales for use as mulch across the site. Excelsior mulch is utilized in wetter soils to insulate the ground and provide microclimates for plants, while not introducing any weeds to the site and remaining stationary in high winds without crimping. The excelsior bales will be spread out after seeding has occurred. The excelsior will be fluffed and spread to a depth of exactly two inches (2").

Excelsior can be purchased from Western Excelsior in Mancos, Colorado:

http://www.westernexcelsior.com/

All revegetation will conform to Standard Work Specification 20 from the General Bid Specifications 2009.

Measurement and Payment

Payment for this task will be made at the unit price established in Item 13 of the Bid Schedule.

Measurement for payment will be made per acre of revegetation. Revegetation areas will be measured to the nearest 0.1 acre and paid at the unit price bid on the Bid Schedule. Payment for this task will be upon completion of installation and upon approval of the PROJECT MANAGER.

Such payment shall be considered full compensation for all labor, materials, equipment and all other items necessary and incidental to the completion of Bid Item 13.

http://www.westernexcelsior.com/

ADDITIONAL BID ITEMS

There are included on the Bid Schedule, several additional bid items. These bid items are not guaranteed, and will be used only in the event that conditions change on site, and only after approved by the PROJECT MANAGER. The additional bid items for this project include:

TASK 14 ADDITIONAL EXCAVATE AND PLACE WASTE FROM BELOW ACCESS ROAD

INTO REPOSITORY

This task includes the work required to excavate, transport, and place additional waste materials not included in Task 7. This task will be performed only if the quantity of waste materials exceeds the volume estimate for excavation, hauling, and placement in the repository in Task 7, and only as directed by the PROJECT MANAGER. This task will be accomplished according to the specifications described in Task 7. The additional excavation, transport, and placement of wastes in Bid Item 14 are NOT GUARANTEED. The estimated quantity of additional waste that may be required is 2,000 cubic yards.

Measurement and Payment

Measurement for payment for this task will be measured to the nearest cubic yard of additional mine waste excavated, transported, and placed in the disposal area, as directed by the PROJECT MANAGER. Payment for this task will be paid for at unit prices established in Item 14 of the Bid Schedule per cubic yard of additional mine waste excavated, transported, and placed. Such payment shall be considered full compensation for all labor, materials, equipment and all other items necessary and incidental to the excavation, transportation, and placement of mine wastes, as directed and described in the specifications. Payment will be as this task is completed and approved by the PROJECT MANAGER. Invoices are to be accompanied by Daily Job Logs summarizing the work included in the invoice. The additional excavation, transport, and placement of mine wastes in this Task are NOT GUARANTEED.