20210426_Blast Record

RED
Post-Shot Record
Tri-County Paving
DATE: 4/26/2021
SHOT: Production
West Jefferson NC
MATERIAL: Granite
Pages: Blast Report
Seismograph
Timing
Bill of Lading
Map

215 South Main St. Suite 3, Zelienople, PA 16063
Usce
BLASTING LOG
General Information
1 . Customer Name Tri-County Paving Shot# 2 for 2021
2 . Job Name West Jefferson NC Permit
3 . Location of Blast N 36 24' 24.53", W 81 28' 57.53" Date: 4/26/2021
Time: 1:45 PM
4 . Nearest Protected Structure Ashe County Rescue Building
Direction & Distance (Feet) N 170'
5 . Weather Conditions Clear, Warm, 70 degrees
6 . Type of material blasted Granite
7 . General Comments Blast loaded without any issues, more details on conditions
of bench and shot performance on Page 2
Blast Information
8 . Identify Explosives used:
Type Amount/ lbs.
Pentex 340 3/4 lb cast boosters 99 (75 lb)
Fortel 2.5 x 7 325 2275 Ib
Amex 501b ANFO bags 3 (150 lb)
30' handidets 25/500ms 99
20' connectadet 42ms surface delays 7
1000' lead line 1
Total weight of explosives consumed: Powder_+ Primers
2500 Total lbs.
Powder Factor is: 1.0 Ib/cy
9 . Blasthole Data: Total Boreholes 99 Diameter: 2.5"
Depth: 14'-18' Burden: 8 Spacing: 7
Total Cubic Yards Blasted: 2488
Total Square Feet Pre-Split:
10 . Stemming Data: Type of Material used Clean, Crushed Stone
Length 6'
11 . Type Initiation System used Non Electric
12 . Type of In-hole delay used 500 milliseconds
13 . Type of Surface delays used 25 milliseconds
14 . Max. Weight of Explosives Allowed per Delay Period (show approx. formula )
W=(d/50)^2 11.56
0-300 ft. W=(d/50)2 x6x8.5 301-5000 ft. W=(d/55)2 Over 5001 ft. W=(d/65)2
15 . Maximum Weight of Explosives used per Delay 42 lbs.
16 . Average Weight of Explosives used per Borehole 35 lbs.
17 . Type and Method of Firing nonel starter

Seismograph Data
Date: Shot#: 2 for 2021
18 . Date and Time of Recording 4/26/2021 13:45
19 . Type of Instrument KESCO Portable
20 . Trigger Level: Geophone .005 in/sec Microphone 124 dBL
21 . Calibration Signal or Certificate of Annual Calibration (Attachment)
22 . Frequency Limits of Instruments:
23 . Location of Seismograph(s) (include distance from blast site)
#1 170' at the Ashe County Rescue Hall
#2
#3
24 . Name of Individual Taking Readings Michael Broadbent
25 . Highest Recorded Readings:
L= 1.8 in/sec
T= 2.3 in/sec Air db 114
V= 1.3 in/sec
26 . Comments:
Shot loaded really well. Some holes on the South end of the shot were backfilled with
muck due to rain the previous week. Most holes were wet, but the shot performed very
well with control. Blast was pulled toward the open end which was south. Portable
seismograph was placed at nearest structure. However, there was very little compitent,
undisturbed ground to get the geophone coupled to the ground well.
27 . Sketch of Blast Design and Delay Pattern ( To be attached)
Note: Show Direction to Nearest Protected Structure on Sketch
Verifying Signature
Name of Blaster-in-Charge (Print or Type) Logan Myers
Certification Number of Blaster-in-Charge
Signature of Blaster-in-Charge /
CREW LIST
Page 2

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Tri County Paving 4/26/2021
North
42 ms surface delay
25 ms delay
OPEN FACE
400 —375 350 325 300 275 250 _ 225 200 175 150 125 100 75 —5-0L 25
467 442 417 392 367 342 317 _ 292 267 242 _ 217 192 167 142 11� 92
534 509 484 459 434 409 384 359 334 309 _ 284 259 234 209 18�159
668 643 6 88 593 568 543 518 493 468 443 418 393 368 _ 343 318 293~ 268
777 752 752 727 727 702 702 677 677 652 652 627 627 602 602 577 577 552 552 527 527 502 502 477 477 452 452 427 427 402 402 377 377

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