REV95817

• Permit No: M1983033
• IBM Index Class Name: Revision
• Doc Name: COMMENTS
• Type & Sequence: TR7
• Media Type: D
• Archive: No

VIBRA-TECKENGINEERS BLAST AND SEISMOGf`APHIC REPORT
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Job Location_ ~~ L ~T~ ~ IYl
Date ~-~5-0~ 77 ,/'/Blast No. IVO~y//~ Time ~•/~~~-
Exact Blast Locations~B °T~` ~- ~,'~ rr /t/ ~~J " .,~ ~ ~ •~-~ ~ ~r Lt~ --
~B J
No. of Hoiess.2Q~ Diameter ~- in. Avg. Depth~ft. Subgrade~ft.
Spacing ~~ tt. Burden ~S _ ft. Avg. Stemming ~~ ft.
Make 8 Type of Explosives: /~
~OT~A/ ~kPi~ riYim~ '''/ lbs.
DO ~-~ ,P 3~ 7 ! ~ lbs.
~-'/~ A-lll~D mr/t~ ~/ ~~~ lbs.
lbs.
lbs.
Total Explosives ~ lbs.
Delay Make 'U /C/(' 19
DelayTypeBNos. /1'7S a~¢"-/11~ ~o~
Min. delay period U ms.
Max. lbs./delay period mC..~J~ lbs.
Blaster ~/~OMP~s /GE,~~/OLD S
Weather Z~~t/ C L0~1,i (C T~L-a~,NTi?r)
Wind Direction 8 Speed /V~ ~
Detail or Diagram Blost Layout: Number of rows; Number of holes in eoch row; Number of decks
per hole; omount of stemming between powder columns; nominal deloy time between decks, holes
and rows. Il1se reverse side if necessary.)

Ground vibration and air concussion intensities resulting from file blast were below
the seismograph trigger levels, thus no seismic waveform was stored. Trigger levels
were well below USBM recommended safe to structures level limits.
Trigger Levels:
Ground - 0.02 in/sec
Air - 125 dB
Op ,) ,~ ~ ~ ~ r 1J~- Range/Gain Setting /, Z .`j ips Trieden Only
Seismograph No. gger Level
Date of lost: Shake Table Colibrotion ~//~~~ Microphone Colibrotion ~ ~ . ~S ipa
Air channel low frequency limit Hertz /C' SE G .
Exact Seismograph Location 3g'O y5 ~ ©y',cJ /U 5 ~ 25 ` y5''~
ScA[--E M~L)`7L-
Seismograph Distance 8 Direction from Blast ~ l~ S G - S'
Peak Overpressure ~' T d8 Scaled Distance
Meters
Peak Particle Velocity ~• r ips O ~
- ~ = -
Remarks:

Vibration Analysis by.
Vlbra-Tech Engineers, InC.
Date:
VTE IOI