HomeMy Public PortalAboutLEDGE REMOVAL INFORMATIONSEPTEMBER 8TH, 2021
LEDGE REMOVAL INFORMATION 1 85 WALNUT ST, WATERTOWN
Proposed Ledge Removal
We anticipate there will be in the range of 3,400 CY's of bedrock which will need to be removed for the
construction of this Project. This operation will be accomplished using a combination of drilling, small charge
blasting, and tractor mounted pneumatic hammer(s) to fracture the rock to a size suitable to be loaded and
removed via conventional 12 to 20 cubic yard capacity dump trucks. We expect this operation will take 20
to 40 workdays to complete (depending on the hardness of the rock and the removal method employed).
Rock removal will create periods of noise pollution and localized ground vibrations. ARCO has conducted
pre -blast construction surveys of the conditions of existing foundations of adjacent buildings. ARCO shall
also conduct vibration analysis during our bedrock breaking operations. We are confident that any vibrations
generated from our operations will be significantly less than that required to cause any damage.
What is Blasting?
Blasting is the process of breaking rock into
smaller fragments using an explosive. First, holes
are drilled in the existing rock. Next, a charge
(small explosive) and detonator is placed in each
hole. Material is packed at the top of the hole to
direct the explosive pressure into the adjacent
rock. Then, the explosive is detonated. Broken
rock material is hauled away or re -used on site.
What is Pneumatic Hammering?
Pneumatic hammering consists of using a
compressed air -powered hammer to chip away at
and break apart large sections of rock. Line
drilling will be conducted prior to hammering to
weaken the rock surface.
Learn more about Blasting from the Department of Fire Services at Mass Gov;
• https://www.mass.gov/doc/blasting-for-property-owners/download
• https://www.mass.gov/service-details/blasting-explosives-and-fireworks
Tentative Schedule*
*Schedule is subject to change due to unknown conditions of bedrock. Bedrock conditions will become
more aparent as light charge blasting and pneumatic hammering operations commence. Hours of
operation for blasting, drilling, and hammering will be strictly within 7:OOAM — 4:OOPM, Mon -Fri.
SEPTEMBER - OCTOBER 2021
SUN MON
TUES WEDS
THURS
FRI SAT
26
3
10
17
27
LIGHT CHARGE
BLASTING
28
LIGHT CHARGE
BLASTING
4
LIGHT CHARGE
BLASTING
5
LIGHT CHARGE
BLASTING
11
LINE DRILLING
12
LINE DRILLING
18
PNEUMATIC
HAMMERING
19
PNEUMATIC
HAMMERING
28
LIGHT CHARGE
BLASTING
30
LIGHT CHARGE
BLASTING
1
LIGHT CHARGE
BLASTING
6 7 8
LIGHT CHARGE LIGHT CHARGE LIGHT CHARGE
BLASTING BLASTING BLASTING
13
14
15
LINE DRILLING 1 LINE DRILLING 1 LINE DRILLING
20
PNEUMATIC
HAMMERING
21
PNEUMATIC
HAMMERING
22
PNEUMATIC
HAMMERING
2
9
16
23
Questions? Please feel free to contact any member of our ARCO National Construction team:
•
Jim Kusner
jkusner@arcol.com
(314) 614-7175
• Mike King
mking@arcol.com
(314) 918-2127
•
Sophie Shipe
sshipe@arcol.com
(978) 387-4420
ARCO NATIONAL NEW ENGLAND 1 30 SPEEN STREET SUITE 300 1 FRAMINGHAM, MASSACHUSETTS 01701 1 508.217.3131 1 FAX 314.963.7114 1 WWW.ARCONATIONAL.COM