7607_GreatOakBlastPlan_DIN26275_20160614

1 6/14/2016

Great Oaks Landfill
Randleman, NC

Rock Blasting

Prepared By

Beckley Drilling & Blasting Services, Inc.
P.O. Box 1907
Beaver, WV 25813
Phone [phone] Fax [phone]

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Table of Contents

Section Description

1 Scope of Work

2 General Procedures

3 Initiation System

4 Production Blasting

5 Vibration and Air Blast Monitoring

6 Flyrock and Dust control

Section 1
Scope of Work

The scope of work shall consist of excavation of rock by systematic drilling and
blasting operations. The work shall only be performed within the limit shown on
the grading plans to perform rock excavation. This work consists of furnishing all
labor, equipment and materials to perform drilling and blasting of bed rock as
required at the Great Oaks Landfill in Randleman, NC.

BD&B anticipates having one (1) drill on the project. The blasting crew will
consist of 1 Blaster, 1 Laborer and 1 explosive delivery truck driver.

A typical day sequence of events:

1. Crew meets at 6:45 am at central location for daily JHA meeting.
2. Driller to pre shift the drill prior to starting.
3. Drilling to commence at 7:00am.
4. Blaster-in-charge will check weather forecast prior to loading.
5. Blasting Crew to check the boreholes with the drill logs.
6. Blasting Crew to start placement of caps and boosters at boreholes.
7. Blasting Crew to start loading and stemming of boreholes.
8. Upon completion of loading, blasting crew will hook up shot.
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9. Blaster in charge will walk shot to assure all holes are connected.
10. Blaster in charge will coordinate with project management on scheduled
time of detonation.
11. Blaster in charge will assure blasting zone is all clear.
12. Blaster in charge will give the appropriate audible warning.
13. Blaster in charge will initiate shot.
14. Blaster in charge will check the blast area and give the all clear signal
only after insuring complete detonation.(See All Clear Signal in General
Procedure Section 2.)
15. Drilling will resume immediately after shot is cleared.

No production equipment will be operated within 50 feet of the blast area while
being loaded. Drilling will continue while loading of shot and will be no less than
50 feet from a loaded borehole.

Section 2
General Procedures

Beckley Drilling & Blasting Services, Inc. has been contracted by Preston
Contractors to provide drilling and blasting services.

1. Licensed and experienced blasters will perform all blasting on project.

2. Explosives and blasting agents will be delivered on an as needed basis. No
explosives will be stored on-site. The product delivered will be inventoried prior
to delivery and upon completion of the blast. All blasting agents and accessories
will be listed on the delivery ticket and the blast report.

3. The delivery vehicles used to transport the explosives and blasting agents will
conform to all local, state and federal regulations. All vehicles used for the
transportation of explosives will have the appropriate safety equipment.
Explosives will be delivered directly to the blast area. The truck will be unloaded
with the explosive products being hand carried to the borehole and or pumped
directly into the borehole.

4. All boreholes will be loaded and stemmed prior to hooking up the shot.

5. The blaster-in-charge will be in communication with contractor personnel via CB
or 2-way radio to assure blasting zone is clear prior to shot. No one will be
permitted to enter post-blast zone until the Blaster-in-charge issues the all-clear
signal. All personnel will be moved to a safe distance from the blast area prior to
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the blast. The safe zone will be designated by the blaster-in-charge and will be
communicated to project management prior to loading any boreholes.

6. All blasting shall be conducted during daylight hours as defined as sunrise to
sunset.

7. The owner will be notified daily prior to any blast. Prior to the firing of each
blast, all persons in the danger area will be warned of the blast and ordered to a
safe distance. The blast will not be fired until it is certain that every person has
retreated to a safe distance and that no one remains in a dangerous location. All
blasting operations will use the following signals:

WARNING SIGNALS -

Notification will be given to Preston a minimum of one (1) hour prior to initiating
blast. It is anticipated that blasting will be conducted on a daily basis with the
exception of Weekends.

Prior to blasting, a Five (5) minute warning signal audible to a range of one half
(1/2) mile from the blast will be given. This will consist of five (5) long warning
signals of five (5) seconds duration with five (5) seconds between each signal. A
One (1) minute warning signal will be given. This will consist of five (5) short
warning signals of one (1) second duration with one (1) seconds between each
signal.

ALL CLEAR SIGNAL -

After detonation of the blast, the blaster shall walk and inspect the blast area to determine
if live explosives or misfires are present. All others shall be kept at a safe distance away
from the blast area during this inspection. Once it is determined that no misfires or live
explosives are present, the “all clear” signal shall be given with the warning signal
audible to a range of one half (1/2) mile from the blast will be given by sounding it once
continuously for a ten (10) second duration.

These signals will only be sounded by “Blaster in Charge” the person in charge of the
blasting operations. He will only sound these signals after he has received the all clear
from the project superintendent or his designated representative. The Blast warning signal
device will be rotated around during each sounding so that its sound is directed as much
as possible toward all surrounding work areas.

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SAFETY -

Beckley Drilling will abide by their Safety Program and well as those of Preston
Contractors. No unauthorized personnel will permitted in the blast area during the
loading and blasting operation.

Section 3
Initiation System

A non-electric initiation system is recommended due to its limitless number of delay
possibilities, not being affected by stray current, radio frequency and static electricity.
Non-electric initiation provides more versatility along with the desired safety features.
Beckley Drilling & Blasting will be utilizing Dual Delay Nonel downhole caps(x/350)
and 17, 25, or 42 ms surface delays and ½ lb to 3/4 lb cast boosters.

Section 4
Production Blasting

Production blasting will utilize the following materials:

Blasting Agents: Bulk Emulsion and Bulk ANFO
Initiation (Boosters): ½ lb and ¾ lb cast boosters
Non Electric Detonators.

Borehole Depth

Borehole depths will vary throughout the project from 8 feet to 30 feet.

Blast Design

Borehole spacing and the weight of the explosive material will change depending on the
depth of hole, available relief and visual borehole analysis. The following are typical
parameters.

Borehole Size 4 1/2” to 5”
Burden 6 to 10 Feet
Spacing 6 to 12 Feet
Stemming 5 to 6 feet
Stemming Material Drill cuttings or #8 Gravel
Powder Factor 1.0 to 1.40 pounds per cubic yard
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Blast Log

Blasting Logs will be filled out daily and turned into Preston Contractors the following
day. These Blasting Logs will include the following information;
- General Information
- Blast Information
- Seismograph Data
- Sketch of Delay Pattern
See Attachment C for an example Blast Log

Section 5
Vibration and Air Blast Monitoring

Maximum allowable air blast and ground vibration limits for this project:

All blast designs will conform to the following peak particle velocities:

Nearest protected structure – 1.0 ips

The maximum charge weight per delay will be initially approximated by the following
equation:

W=(R/Ds)^2
Where: R = Distance in feet to nearest protected structure
Ds = The scaled distance factor
W = Maximum explosive weight per delay period of 8 ms or more
in pounds.

The scaled distance factors to be applied without seismic monitoring are as follows:

0 - 300 feet Ds = 50
301 – 5000 feet Ds = 55

The development of a modified scaled distance factor may be implemented, if supported
by seismograph records of the blasting at the permit site. In addition, reduction of
borehole depths and decking may be utilized to lower the pounds per delay. These
options will be implemented if the vibration levels start approaching the critical limits as
shown on the seismograph reports.
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Air Blast:

Air blast will not exceed the maximum limits listed below at the location of any
Dwelling, public building, school, church, community or institutional building outside of
the blasting zone.

Lower Frequency Limit of Measuring System Maximum Level in dB
In Hz (3dB)

0.1 Hz or lower – flat response 134 peak
2.0 Hz or lower – flat response 133 peak
6.0 Hz or lower – flat response 129 peak

Section 6

Methods to Control fly Rock:

Fly rock, including blasted material will not be cast from the blasting site more than half
the distance to the nearest protected dwelling or other occupied structure, or in no case
will the fly rock be cast beyond the limits of the construction area. Sufficient stemming
depth and burden from any free face will be used to insure that fly rock will be
controlled.

Dust Control:

Drilling – Any and all drills that will be utilized on this site are hydraulic self-contained
drills with cabs, dust collection systems and a water system as backup. These systems
are designed to minimize dust created from the drilling operation.

Blasting – In an effort to reduce dust outside of the permit area, blasting could be
delayed when gusting winds are blowing away from the blasting area toward any
dwellings.

Lightning:

The blaster-in-charge will monitor the weather with an android phone with weather apps
for impending thunder storms. Loading of boreholes will no commence unless the
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weather is conducive to performing the work in a timely manner to assure detonation
prior to impending weather conditions.

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