Am#2 Appx 1- Item 4.0 Feature Work Table REVISED.pdf

Appendix 1 – Item 4.0 Feature Work Table REVISED

Table - Dream Canyon – Item 4.0 Install Mine Closures

Feature ID Type Description of Mine

Opening Closure Method

General Bid Specifications and Drawings

UTM

(X,Y)

NAD83 Work Description / Notes

363-GF002 Shaft

Excavated:5ft by 6ft Eroded:8ft by 8ft Present:8ft by 8ft

Depth:15 ft Lining:Rock Drainage:No

Machine Backfill Section 2 465599

4428500

BAT EXCLUSION PRIOR TO CLOSING PER SPEC

PROVIDED UNDER ITEM 4.0.

Remove timber debris. Excavate to determine extents.

Bar off rocks from shaft collar and machine backfill with approximately fifty (50) cubic yards of imported common fill material. Rockfill is not required.

Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five

(25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.

363- GF002a Shaft

Excavated:5ft by 9ft Eroded:12ft by 9ft Present:5ft by 9ft Depth:23 feet ft

Lining:Rock Drainage:No

Machine Backfill Section 2 465580.

4428496

Remove timber debris. Excavate to determine extents.

Bar off rocks from shaft collar and machine backfill with approximately fifty (50) cubic yards of imported common fill material. Rockfill is not required.

Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five

(25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.

Description of Mine

Opening Closure Method

General Bid Specifications and Drawings

UTM

(X,Y)

NAD83 Work Description / Notes

363-GF003 Stope

Excavated:

Eroded:17ft by 34ft Present:17ft by 34ft

Depth:17 feet ft Lining:Rock Drainage:No

Machine Backfill Section 2 465564

4428474

BAT EXCLUSION PRIOR TO CLOSING PER SPEC

PROVIDED UNDER ITEM 4.0.

Remove three (3) mature trees and set aside below the feature to create a barrier to catch any debris that may leave the site during construction. The feature is located above Highway 119 and contractor will need to take precautions to avoid any rock/boulders rolling downhill. Excavate to determine extents. Machine backfill with onsite material. Rockfill is not required.

Cut downed trees into four (4) foot lengths and pile neatly after backfill is complete.

Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five

(25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.

363-GF004 Stope

Excavated:5ft by 7ft Eroded:3ft by 7ft Present:3ft by 7ft Depth:18 feet ft

Lining:Rock Drainage:No

Machine Backfill Section 2 465562

4428520

BAT EXCLUSION PRIOR TO CLOSING PER SPEC

PROVIDED UNDER ITEM 4.0.

Excavate to determine extents. Machine backfill with onsite material. Rockfill is not required.

Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five

(25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.

363-GF005 Adit

Excavated:3ft by 7ft Eroded:3ft by 7ft Present:3ft by 7ft Depth:18 feet ft

Lining:Rock Drainage:No

Machine Backfill Section 2 465493

4428523

BAT EXCLUSION PRIOR TO CLOSING PER SPEC

PROVIDED UNDER ITEM 4.0.

Excavate to determine extents. Machine backfill with onsite material. Rockfill is not required.

Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five

(25) linear feet of biodegradable waddles shall be

Description of Mine

Opening Closure Method

General Bid Specifications and Drawings

UTM

(X,Y)

NAD83 Work Description / Notes

363-GF006 Adit

Excavated:3ft by 7ft Eroded:3ft by 7ft Present:3ft by 7ft Depth:15 feet ft

Lining:Rock Drainage:No

Rock Bulkhead w/ Bat Ladder

Section 14 Section 13

Std. Drawing #s

6.2 & 10

465476 4428525

Construct a Rock Bulkhead closure with Bat Grate Alternative. Utilize a minimum three (3) foot length of twenty-four (24) inch, twelve (12) gauge CSP with an attached bat ladder.

Neither an access door nor drainpipe are required.

363- GF007a Stope

Excavated:10ft by 4ft Eroded:10ft by 4ft Present:10ft by 4ft

Depth:10 feet ft Lining:Rock Drainage:No

Modified Machine Backfill

Section 2 465506 4428556

Install 5 CY of polyurethane foam inside opening to support bridge. Backfill both sides of opening with onsite material. Use large rocks on site.

Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five

(25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.

363- GF007b Stope

Excavated:3ft by 5ft Eroded:3ft by 5ft Present:3ft by 5ft Depth:10 feet ft

Lining:Rock Drainage:No

Modified Machine Backfill

Section 2 465497 4428550

Install 5 CY of polyurethane foam inside opening to support bridge. Backfill both sides of opening with onsite material. Use large rocks on site.

Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five

(25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.

363- GF007c Stope

Excavated:3ft by 5ft Eroded:3ft by 5ft Present:3ft by 5ft Depth:10 feet ft

Lining:Rock Drainage:No

Machine Backfill Section 2 465492

4428546

Backfill trench and stope with large onsite rocks and material.

Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five

(25) linear feet of biodegradable waddles shall be

Description of Mine

Opening Closure Method

General Bid Specifications and Drawings

UTM

(X,Y)

NAD83 Work Description / Notes

363-GF008 Stope

Excavated:60ft by 1ft Eroded:60ft by 5.5ft Present:50ft by 5.5ft

Depth:65 feet ft Lining:Rock Drainage:No

Shaft Grate w/ Bat Cupola

Section 8, Std.

Drawing # 4 and

Attachment 3

465469 4428544

Stope ranges in width from three (3) to ten (10) feet.

Grating will span sixty (60) feet by ten (10) feet.

Install a grated shaft closure with a bat cupola in accordance with Grated Shaft Closure Specifications and Attachment 3, Bat Cupola Specifications. The modified bat gate will be a raised four (4) sided ‘cupola’ consisting of one (1), six inch (6”) high by twenty-four inch (24”) wide bat slot on each side. Approximately fifteen (15) ten-foot (10’) W4 x 13 steel beams are required, adjusted by grating sizes specified in Table

8.1 in Section 8 of the General Bid Specifications.

Incompetent, weak and failing rock will need to be barred down prior to any work. Access Door NOT required.

363-GF009 Stope

Eroded:20ft by 40ft Present:13ft by 22ft

Depth:100 ft ft Lining:Rock Drainage:No

Shaft Grate w/ Bat Cupola

Section 8, Std.

Drawing # 4 and

Attachment 3

465538 4428565

Install a grated shaft closure with a bat cupola in accordance with Grated Shaft Closure Specifications and Attachment 3, Bat Cupola Specifications. The modified bat gate will be a raised four (4) sided ‘cupola’ consisting of one (1), six inch (6”) high by twenty-four inch (24”) wide bat slot on each side. Approximately five (5), fifteen foot (15’) W6 x 20 steel beams are required, adjusted by grating sizes specified in Table

8.1 in Section 8 of the General Bid Specifications..

Access Door NOT required.

363-GF010 Adit/ Decline

Excavated:5ft by 2ft Eroded:5ft by 2ft Present:5ft by 2ft

Depth:5 ft ft Lining:Concrete

Drainage:No

Grate with Bat Grate Alternative

Section 11 Section 13

Std. Drawing #s

6.1 & 6.2

465473 4428548

Construct a grated adit closure with a minimum two (2) foot by four (4) foot bat ladder in accordance with Grated Adit Closure Specifications. Neither an access door nor drainpipe are required.

363- GF010a

Adit/ Decline

Excavated:5ft by 2ft Eroded:5ft by 2ft Present:5ft by 2ft

Depth:8 ft Lining:Concrete

Drainage:No

Rock Bulkhead

Section 14 Std.

Drawing # 10

465472 4428594

The foundation shall be cleared of all unconsolidated material prior to construction of the bulkhead.

Construct a bulkhead seal of grouted durable native rock, a minimum of thirty inches (30”) in thickness.

Drainpipe IS required. Access door is NOT required.

Description of Mine

Opening Closure Method

General Bid Specifications and Drawings

UTM

(X,Y)

NAD83 Work Description / Notes

363-GF012 Shaft

Excavated:4ft by 8ft Eroded:17ft by 35ft Present:15ft by 25ft

Depth:14 feet ft Lining:Rock

Drainage:Yes

Machine Backfill Section 2 465645

4428649

Collapse sides of opening to reduce highwall. Leave wood/brush debris. Sixty cubic yards (60cy) of imported common fill required.

Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five

(25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.

363-GF013 Adit

Excavated:8ft by 7ft Eroded:9ft by 9ft Present:9ft by 9ft Depth:17 feet ft

Lining:Rock Drainage:No

Grate with Access and Bat Grate Alternative

Section 11 Section 13

Std. Drawing #s

6.1 & 6.2

465690 4428641

After clearing all loose debris, specifically removing loose rock above the adit, Construct a grated adit closure with a minimum two (2) foot by four (4) foot bat ladder in accordance with Grated Adit Closure Specifications. Access door is required. Drainpipe is not required.

363-GF015 Shaft

Excavated:8ft by 5ft Eroded:10ft by 10ft Present:10ft by 10ft

Depth:10 ft Lining:Rock

Drainage:Yes

Machine Backfill Section 2 465714

4428570

Excavate to determine extents. Machine backfill with onsite material. Rockfill is not required.

Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five

(25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.

363- GF015a

Adit/ Decline

Excavated:4ft by 5ft Eroded:2ft by 3ft Present:2ft by 3ft

Depth:10 ft Lining:Rock

Drainage:Yes

Rock Bulkhead

Section 14 Std.

Drawing # 10

465731 4428572

The foundation shall be cleared of all unconsolidated material prior to construction of the bulkhead.

Construct a bulkhead seal of grouted durable native rock, a minimum of thirty inches (30”) in thickness.

Drainpipe IS required. Access door is NOT required.

363-GF016 Adit

Excavated:3ft by 1.5ft Eroded: 3ft by 1.5ft Present: 3ft by 1.5ft

Depth:14 ft Lining:Rock Drainage:No

Rock Bulkhead w/ Bat Ladder

Section 14 Section 13

Std. Drawing #s

6.2 & 10

465737 4428520

The foundation shall be cleared of all unconsolidated material prior to construction of the bulkhead.

Construct a Rock Bulkhead closure with Bat Grate Alternative. Utilize a minimum three (3) foot length of thirty-six (36) inch, twelve (12) gauge CSP with an attached bat ladder.

Neither an access door nor drainpipe are required.

Description of Mine

Opening Closure Method

General Bid Specifications and Drawings

UTM

(X,Y)

NAD83 Work Description / Notes

GF017 Stope

Excavated:5ft by 3ft Eroded:5ft by 3ft Present:5ft by 3ft Depth:20-30ft ft

Lining:Rock Drainage:No

Grated Corrugated Steel Pipe with Bat Grate

Alternative

Section 9 Section 10 Section 13

Std. Drawing #s 5 & 6.2

465671 4428646

Set a bottom form at a depth of ten (10) feet and install approximately eighteen (18) cubic yards of polyurethane foam in accordance with Polyurethane Foam Closure Specifications to create a plug.

Construct a 24-inch diameter ten (10) foot length of twelve-gauge (12 ga.) corrugated steel pipe (CSP) with bat ladder in accordance with Corrugated Steel Pipe Specifications and Bat Grate Alternative. A minimum of eight (8) feet of CSP will be set inside the opening. On-site materials shall be used to backfill around the CSP.

No access door or drain pipe is required.

W-1 Stope

Excavated:5ft by 3ft Eroded:13ft by 13ft Present:5ft by 3ft

Depth:N/A ft Lining:Rock Drainage:No

Machine Backfill Section 2 469855

4429753

Excavate to determine extent of opening. Backfill with onsite material. Rockfill is not required.

Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five

(25) linear feet of biodegradable waddles shall be