Appendix 3 Blasting Plans.pdf

Appendix 3 to PWS – Blasting Plans

i. Blasting - Blasting is not required but if blasting is the chosen method, Appendix 4 shall apply.

ii. Regulations. Only use explosives and initiating devices less than 1-year old.

Explosives and initiating devices include, but are not necessarily limited to, dynamite and other high explosives, slurries, water gels, emulsions, blasting agents, initiating explosives, detonators, and detonating cord.

iii. Regulations. Furnish copies or other proof of all-applicable permits and licenses.

Comply with Federal, State, and local regulations on the purchase, transportation, storage, and use of explosive material. Federal regulations include the following:

1. a). Safety and health: OSHA,29 CFR Part 1926, Subpart U.

2. b). Storage, security, and accountability: Bureau of Alcohol, Tobacco, and Firearms (BATF), 27 CFR Part 181.

3. c). Shipment: DOT, 49 CFR Parts 171-179, 390-397

iv. Blaster-in-Charge. Designate in writing a blaster-in-charge. Submit evidence that the blaster-in-charge has a valid State blaster’s license or other license accepted by the State where the project is located and issued by an equivalent licensing body for the type of blasting required.

v. Blasting Plans. Blasting plans are for quality control and record keeping purposes and are to be signed by the blaster-in-charge. The review and acceptance of blasting plans does not relieve the Contractor of the responsibility for using existing drilling and blasting technology, and for obtaining the required results.

Do not deliver explosives to the project until the general blasting plan is accepted.

a). General blasting plan. Submit a general blasting plan for acceptance at least 14 days before drilling operations begin. Include, as a minimum, the following safety and procedural details:

1). Working procedures, and safety precautions for storing, transporting, handling, and detonating explosives.

2). Proposed product election for both dry and wet holes. Furnish Manufacturer’s Material Data Sheets for all explosives, primers, initiators, and other blasting devices.

3). Typical plan and section views for both production and controlled blasting, including maximum length of the shot, burden, hole spacing, hole inclination, hole depth, hole diameter, subdrill depth, and powder factor.

4). Proposed initiation and delay methods and delay times.

vi. Blasting cont.

vii. Drill and blast according to the blasting plan. Cap all holes to prevent unwanted backfill. Place a stake next to each hole with hole number and total depth drilled.

Use the types of explosives and blasting accessories necessary to obtain the required results. A bottom charge may be larger than the line charges if no overbreak results.

cljensen Sticky Note Appx 3?

Appendix 4 to PWS – Blasting Plans

Free blast holes of obstructions for their entire depth. Place charges without caving the blast hole walls. Stem the upper portion of all blast holes with dry sand or other suitable granular material. Do not stem hole with drill cuttings.

Following a blast, stop work in the entire blast area, and check for misfires before allowing workers to return to excavate the rock.

Remove all cut face rock that is loose, hanging, or potentially dangerous. Scale by hand or machine methods as approved by the CO. Leave minor irregularities or surface variations in place if they do not create a hazard. Drill the next lift only after the cleanup work and stabilization work is complete.

If blasting operations cause fracturing of the final rock face, repair or stabilize it in an approved matter at no cost to the Government. Repair or stabilization may include removal, rock bolting, rock dowels, or other stabilization techniques.

Halt blasting operations when any of the following occur and perform additional test blast:

1). Slopes are unstable;

2). Slopes exceed tolerances or overhangs are created;

3). Backslope damage occurs;

4). Safety of the public is jeopardized;

5). Property or natural features are endangered;

6). Fly rock is generated;

7). Excessive ground or airblast vibrations occur in an area where damage to buildings, structures, or utilities is possible.

cljensen Sticky Note Appx 3?