A#1 Wandering Prospector_REVISED_Feature Work List.pdf

Wandering Prospector – A#1 REVISED Feature Work List

Feature ID Type Description of Mine Opening

Closure Method

Standard Work Specifications and Drawings

UTM

NAD83 Work Description / Notes

WP-02 Shaft

Excavated: 8ft by 4ft Eroded: 25ft by 25ft Present: 25ft by 25ft Depth:18ft Lining: Rock Drainage: No

Reinforced Polyurethane Foam Plug

See Description 388407.02 4355048.62

Install a Reinforced Polyurethane Foam (PUF) Plug.

The closure shall be constructed in a similar manner to a Concrete Monolithic Plug (SWS 7) except substituting PUF for concrete. The PUF plug will also be reinforced using pressure treated 4”x4”x12’ posts. Prior to installing PUF, four (4) reinforcing posts shall be placed horizontally roughly three (3) feet above the bottom of the opening. Posts shall be parallel and spaced twenty-four (24) inches apart. Both ends of the reinforcing posts shall be keyed into the sides of the shaft, keeping the posts level with each other. Installed posts should resemble floor joists. Trimming posts may be required for proper fitment. Contractor must ensure that the posts are anchored and don’t “float” as the PUF rises and that both ends are fully encased with foam. PUF must be installed slowly to prevent voids from forming below the reinforcing posts. Once the final lift of PUF has solidified, a one (1) inch uniform layer of fill material shall be shoveled over the surface to protect the PUF from sunlight and vandalism. The PUF plug must cure for a minimum of forty-eight (48) hours before finishing the remainder of the backfill. Backfill material will be designated by the Project Manager. Minor adjustments to this specification may be required in the field to properly construct the closure. All personnel working in or around the opening must be harnessed and tied off to a secure point. Twelve (12) cubic yards of PUF and four (4), twelve-foot-long (12’) pressure-treated 4x4-inch posts (4”x4”x12’) are required for this closure.

Rockfill or a drainpipe are not required. A standard monument pipe is required.

WP-03 Stope

Excavated: 4ft by 4ft Eroded: 8ft by 6ft Present: 2ft by 2ft Depth: 12ft Lining: Rock Drainage: No

Hand Backfill SWS 2 388082.02 4354910.20

Install one (1) cubic yard of rockfill and backfill the feature by hand with adjacent dump material in accordance with SWS 2.

Contractor must minimize ground disturbance and avoid all other historic mining features in the area.

Opening

Closure Method

Standard Work Specifications and Drawings

UTM

NAD83 Work Description / Notes

WP-04 Shaft

Excavated: 6ft by 4ft Eroded: 6ft by 4ft Present: 6ft by 4ft Depth: 20ft Lining: Timber Drainage: No

Polyurethane Foam Plug SWS 9 388359.70

4354677.26

Install a polyurethane foam (PUF) closure in accordance with SWS 9. Set bottom form at eight (8) feet below ground surface. Install five (5) feet of PUF and backfill the remaining three (3) feet using onsite dump material from the northeast side and creating a drainage swale during the backfilling process.

Five (5) cubic yards of PUF is required for this closure. A standard drainpipe is required.

WP-05 Shaft

Excavated: 8ft by 4ft Eroded: 28ft by 28ft Present: 28ft by 28ft Depth: 18ft Lining: Rock Drainage: No

Monolithic Plug

SWS 7

390804.44 4345951.47

Install a concrete monolithic plug in accordance with SWS 7. Prepare shaft by removing vegetation and loose material and by forming a cone shape on the bottom. Place two (2) feet of rockfill into the prepared opening. Concrete will then be installed to a thickness of four (4) feet and mechanically compacted. Once the plug has cured, the closure will be backfilled with onsite material designated by the Project Manager.

Four (4) cubic yards of rockfill and ten (10) cubic yards of concrete are required for this closure.

WP-06 Shaft

Excavated: 8ft by 4ft Eroded: 25ft by 20ft Present: 25ft by 20ft Depth: 15ft Lining: Rock Drainage: No

Monolithic Plug SWS 7 390829.96 4345976.71

Install a concrete monolithic plug in accordance with SWS 7. Prepare shaft by removing vegetation and loose material and by forming a cone shape on the bottom. Place two (2) feet of rockfill into the prepared opening. Concrete will then be installed to a thickness of four (4) feet and mechanically compacted. Once the plug has cured, the closure will be backfilled with onsite material designated by the Project Manager.

Four (4) cubic yards of rockfill and ten (10) cubic yards of concrete are required for this closure.

Opening

Closure Method

Standard Work Specifications and Drawings

UTM

NAD83 Work Description / Notes

WP-07 Shaft

Excavated: 8ft by 4ft Eroded: 30ft by 25ft Present: 30ft by 25ft Depth: 15ft Lining: Rock Drainage: No

Reinforced Polyurethane Foam Plug

See Description 390913.75 4345985.40

Install a Reinforced Polyurethane Foam (PUF) Plug.

Closure shall be constructed as described above for feature WP-02. Backfill material will be designated by the Project Manager. Twelve (12) cubic yards of PUF and four (4), twelve-foot-long (12’) pressure-treated

4x4-inch posts (4”x4”x12’) are required for this closure. Rockfill or a drainpipe are not required. A standard monument pipe is required.

WP-08 Shaft

Eroded: 25ft by 28ft Present: 25ft by 28ft Depth: 22ft Lining: Rock Drainage: No

Reinforced Polyurethane Foam Plug

See Description 391060.64 4345861.25

Install a Reinforced Polyurethane Foam (PUF) Plug.

Closure shall be constructed as described above for feature WP-02. Backfill material will be designated by the Project Manager. Fifteen (15) cubic yards of PUF and five (5), twelve-foot-long (12’) pressure-treated

4x4-inch posts (4”x4”x12’) are required for this

WP-09 Shaft

Eroded: 20ft by 20ft Present: 20ft by 20ft Depth: 15ft Lining: Rock Drainage: No

Backfill SWS 2 391258.84 4346012.04

Backfill the feature using onsite dump material in accordance with SWS 2. Rockfill is not required for this closure. Difficult Access – mini equipment only. Care must be taken to minimize disturbance along overland access route.

CAUTION: Overhead powerlines adjacent to feature.

Opening

Closure Method

Standard Work Specifications and Drawings

UTM

NAD83 Work Description / Notes

WP-11 Shaft

Excavated: 8ft by 4ft Eroded: 18ft by 15ft Present: 8ft by 4ft Depth: 45ft Lining: Timber Drainage: No

Polyurethane Foam Plug SWS 9 391624.53

4345813.63

Install a polyurethane foam closure in accordance with SWS 9. Remove trees, timbers & debris to clean up shaft opening and expose all sides. Set bottom form five

(5) feet into cribbing (roughly 20’ below ground surface).

Shaft may have a double compartment requiring two (2) bottom forms. Install twelve (12) feet of PUF and backfill the remaining depth, approx. ten (10) feet, using onsite dump material designated by the Project Manager.

Difficult Access – will require work.

Mini equipment only. Buck trees six (6) feet or shorter.

Fifteen (15) cubic yards of PUF is required for this closure. A standard drainpipe is required.

WP-12 Shaft

Excavated: 8ft by 4ft Eroded: 25ft by 30ft Present: 25ft by 30ft Depth: 20ft Lining: Rock Drainage: No

Backfill SWS 2 390851.76 4345546.27

WP-12 consists of two adjacent features. Remove trees from openings and borrow area and backfill the features in accordance with SWS 2. Fill material will be generated from the south side of the feature.

Difficult Access – mini equipment only. Buck trees six

(6) feet or shorter. Care must be taken to minimize disturbance along overland access route. Rockfill is not required for this closure.

WP-13 Shaft

Excavated: 10ft by 8ft Eroded: 35ft by 35ft Present: 35ft by 35ft Depth: 40ft Lining: Rock Drainage: No

Backfill SWS 2 391864.79 4345332.68

WP-13 is a large undercut, collapsed shaft. Backfill the feature in accordance with SWS 2. Rockfill will be collected on site from locations designated by the

Project Manager. Difficult Access – mini equipment only.

Access route will traverse near a mtn. bike park.

Contractor must avoid all park trails and structures and minimize disturbance along access route. Any damage to trails or structures will be repaired by

Contractor. Contractor must be aware of riders and use caution at all times when working in this area.

Opening

Closure Method

Standard Work Specifications and Drawings

UTM

NAD83 Work Description / Notes

WP-14 Shaft

Excavated: 9ft by 5ft Eroded: 9ft by 5ft Present: 9ft by 5ft Depth: 100+ ft Lining: Timber Drainage: No

Polyurethane Foam Plug SWS 9 389937.92

4341904.00

** EXCLUDE & CLOSE **

Install a polyurethane foam closure in accordance with SWS 9. This feature is a two-compartment shaft; each measuring approx. 4’x5’. Set bottom form ten (10) feet into each opening (from top of cribbing). Bottom forms must be at the same level/depth. Install 5 (5) feet of PUF in each opening and hand backfill the remaining three

(3) feet to the existing ground surface using onsite dump material designated by the Project Manager. The cribbing that extends above ground will remain open.

Contractor must cover exposed cribbing to protect from

PUF during installation.

Feature is adjacent to a singletrack trail. Contractor must be aware of hikers and bike riders and use caution when working.

Foot access only - 75’ from road.

A total of nine (9) cubic yards (4.5cy x2) of PUF is required for this closure. A standard drainpipe is required.

WP-15 Shaft

Eroded: 8ft by 4ft Present: 8ft by 4ft Depth: 100+ ft Lining: Timber Drainage: No

Polyurethane Foam Plug SWS 9 388023.62

4330074.54

Install a polyurethane foam closure in accordance with SWS 9. Remove timbers and debris from shaft and place neatly in a location designated by the Project Manager. Clean up shaft opening and prepare it for closure. Set bottom form at nine (9) feet below ground surface. Install six (6) feet of PUF and backfill the remaining depth using onsite dump material designated by the Project Manager.

Seven (7) cubic yards of PUF is required for this

Opening

Closure Method

Standard Work Specifications and Drawings

UTM

NAD83 Work Description / Notes

WP-16 Adit

Excavated: 6.5ft by 4ft Eroded: 6.5ft by 4ft Present: 6.5ft by 4ft Depth: 40ft Lining: Timber Drainage: No

Grated Adit Closure w/ Slot

Bat Gate

SWS 11 & 13

Standard Drawing No. 6

Sheets 1&2

388473.10 4330381.42

Install a steel grated adit closure with slot bat gate in accordance with SWS 11 & 13 and Standard Drawing No. 6, Sheets 1&2. Slot bat gate is a single opening measuring 6”x24”, centered in the top 1/3 of the grating and framed in 2” angle iron. A second slot “rat gate” shall be fabricated into the lower section of grating. The rat gate shall measure 6”x24” and be framed in 2” angle iron. The location of the opening will be determined in the field by the Project Manager.

NOTE: There is a substantial amount of debris

(trash, equipment, furniture, stove, tires, etc..) inside of the adit. The debris removal is limited to only the eight (8) used car tires just inside of the portal. All other debris will remain inside of the adit. Before any work may begin, the portal area, inside and out, must be sprayed with a bleach solution to mitigate possible hantavirus. Bleach solution shall be applied throughout the removal process to ensure all surfaces are disinfected.

All personnel must wear proper PPE and dust masks when removing debris from the adit.

WP-17 Adit

Excavated: 6ft by 4ft Eroded: 4ft by 4ft Present: 6ft by 4ft Depth: 40ft Lining: Rock Drainage: No

Native Rock Bulkhead w/ Slot Bat Gate

SWS 14

Drawing No. 10

359581.03 4330673.92

**IN WILDERNESS**

Install a native rock bulkhead with slot bate gate in accordance with SWS 14 and Standard drawing No. 10.

A slot opening for bats will be incorporated into the top 1/3 of the bulkhead. Slot opening shall measure 6”x24” and may require a lintel or header to properly support the load. Rocks from the hand-stacked wall adjacent to the adit must not be used for bulkhead construction. A standard drainpipe is required for this closure.

NOTE: Feature is located in Wilderness. Foot access only. Motorized, mechanized or wheeled equipment is not permitted when constructing this closure.

Opening

Closure Method

Standard Work Specifications and Drawings

UTM

NAD83 Work Description / Notes

WP-18 Adit

Excavated: 6ft by 5ft Eroded: 3ft by 5ft Present: 3ft by 5ft Depth: 8ft Lining: Timber Drainage: No

Hand Backfill SWS 2 359595.99 4330624.01

**IN WILDERNESS**

Backfill the feature by hand using onsite material in accordance with SWS 2. Rockfill is not required.

NOTE: Feature is located in Wilderness. Foot access only. Motorized, mechanized or wheeled equipment is not permitted when constructing this closure.

WP-19 Adit

Excavated: 6ft by 5ft Eroded: 6ft by 5ft Present: 6ft by 5ft Depth: 15ft Lining: Timber Drainage: No

Native Rock Bulkhead SWS 14 376181.52

4315977.54

Install a native rock bulkhead in accordance with SWS

14. Good rock material in area adjacent to adit.

Drainpipe is not required for this closure.

Foot access only - approx 1,600’ (.3 mile) from road.

WP-20 Shaft

Excavated: 6ft by 6ft Eroded: 6ft by 6ft Present: 6ft by 6ft Depth: 100ft Lining: Rock Drainage: No

Polyurethane Foam Plug SWS 9 373823.53

4313827.15

Remove covering and install a polyurethane foam closure in accordance with SWS 9. Set bottom form at thirteen (13) feet below ground surface and install ten

(10) feet of PUF. Hand backfill the remaining three (3) feet to ground surface using onsite material. Fill material will be generated from the drainage area approx. 75’ from the feature.

Foot access only – approx. 400’ uphill from road.

Fourteen (14) cubic yards of PUF is required for this

WP-24 Shaft

Excavated: 8ft by 4ft Eroded: 35ft by 35ft Present: 35ft by 35ft Depth: 25ft Lining: Rock Drainage: No

Reinforced Polyurethane Foam Plug

See Description 390808.08 4345577.09

Install a Reinforced Polyurethane Foam (PUF) Plug.

Closure shall be constructed as described above for feature WP-02. Backfill material will be designated by the Project Manager. Twelve (12) cubic yards of PUF and four (4), twelve-foot-long (12’) pressure-treated

4x4-inch posts (4”x4”x12’) are required for this

Opening

Closure Method

Standard Work Specifications and Drawings

UTM

NAD83 Work Description / Notes

WP-25 Stope

Excavated: 4ft by 7ft Eroded: 8ft by 9ft Present: 4ft by 7ft Depth: 20ft Lining: Rock Drainage: No

Polyurethane Foam Plug SWS 9 388273.32

4354808.17

Install a polyurethane foam closure in accordance with SWS 9. Set bottom form at nine (9) feet below ground surface. Install six (6) feet of PUF and backfill the remaining depth using onsite dump material designated by the Project Manager.

Six (6) cubic yards of PUF is required for this

WP-27 Adit

Excavated: 6ft by 5ft Eroded: 6ft by 5ft Present: 6ft by 5ft Depth: 30ft Lining: Rock Drainage: No

Grated Adit Closure w/ Bat

Gate

SWS 11 & 13

Drawing No. 6

Sheets 1&2

376162.72 4325427.24

Install a steel grated adit closure with bat gate in accordance with SWS 11 & 13 and Standard Drawing

No. 6, Sheets 1&2. Crossbars for the bat grate shall be ¾” x 3” flat steel bar.