2022-03-28_REVISION - M1981276

• Permit No: M1981276
• IBM Index Class Name: Revision
• Doc Date: 3/28/2022
• Doc Name: Request For Amendment To Permit
• From: Bower Bros Constructions
• To: DRMS
• Type & Sequence: AM1
• Email Name: ZTT
• Email Name: JDM
• Email Name: SMS
• Email Name: AWA
• Media Type: D
• Archive: No

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i SD=88
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1 10 100 1000
Scaled Distance(ft/ib'�z)
Figure 1 Peak particle velocity of ground vibration (PPV)versus scaled distance for blast vibration
measurements recorded at four 4 limestone quarries in the western US(Aimone-Martin Assoc.data
base)
was used to predict the highest possible PPV value at the transmission line for the closest blast using the
planned explosives charge weight of 32 Ib/delay(information provided by blaster Rusty Bauer).
The approximate distance to the transmission line from the closest blasting is planned to be 500 ft.The
minimum SD is 500/(32)1�z or 88 ft/Ib'�2. Using the upper-bound line in Figure 1 at SD=88 the predicted
PPV is 0.38 in/s.
This amplitude of ground vibration results is over 10 times lower than the limit of 4 in/s imposed on
power lines in Pennsylvania and is well within safe levels for towers and lines.
FINDINGS
The power transmission line represents the man-made structure closest to the quarry blasting site at a
distance of 500 ft. This is farther than the 200-ft limit to address stability issues.There will be no-impact
of mine blasting on this power line.