FWIW, the Walgreen's boathouse "basin" was dynamited out of a huge granite ledge. The first blast shook the ground and the entire Lakes Region stratosphere
. From ½-mile away, the mighty explosion caused me to literally fall onto the ground
from out of a hammock! 
A stream of dump trucks took months to remove that rocky residue from out of the Walgreen's "basin", while thousands of granite boulders were dumped at the NW end of The Lakes Region Airpark's runway. Dump trucks shook the ground all summer
but the runway was extended by hundreds of feet, possibly at no cost to The Lakes Region Airpark—
as it saved many miles of trucking.
As of last year, the Marriott's purchased that runway, that extension, that 101+ acres of
The Lakes Region Airpark, including the remains of Walgreen's former granite ledge!
Footnote: A few years ago—to build a multi-residence septic sytem—a Maine blasting company blasted several granite ledges that were only ¼-mile away; however, dynamite-technology has changed: 
except for one barely-noticeable blast, I never noticed the many dynamite blasts at the opposite end of that same runway.
A much closer abutter to those blasts—astonished at hearing my account—told me, "You couldn't miss 'em!"