20131013 Ver 1_More Info Received_20131017

Strickland, Bev
From: Devane, Boyd
Sent: Tuesday, November 12, 2013 3:48 PM
To: Strickland, Bev
Subject: FW: Thomas Allen Driveway 13 -1013
From: Kevin Varnell [ mai Ito: kvarnell Cd)stocksenaineerina.com]
Sent: Thursday, October 17, 2013 8:00 AM
To: Devane, Boyd
Cc: Jeff Harbour
Subject: Thomas Allen Driveway
Boyd,
Thank you for taking the time to talk to me yesterday. Below I am providing some details of the project in an effort to
state my arguments as discussed.
The Thomas Allen Driveway Project is a single family residential driveway. In an effort to reduce the impacts to wetlands
we placed the road location in between a wetland and a beaver impoundment. The stream section that is between the
two features is very narrow and meanders significantly. Combine that with the fact the we cannot cross the stream
perpendicular because of boundary constraints the over impact goes to 75'. We would much rather try to keep the
impacts to 25' and fall under the exemption offered by the buffer rules, but in this situation that is not feasible. The
driveway is proposed to be 4" Gravel approximately 20' wide. The roadway will follow the contour of the land with
minor grading. The fill slope side of the road will sheet flow water off the pavement and onto natural ground. The cut
slope side of the road will have a ditch to keep water from spilling over the driveway. With the natural ridges being
utilized, this only allows 730 LF of half the driveway to flow into the stream via the road side ditch from the east of the
stream and 300 LF of half the drive on the west side of the stream crossing. The rest of the driveway going into the
buffer is by sheet flow. The total site acreage is approximately 35 acres with approximately 1.2 acres of impervious area
including the driveway and residence. This is an impervious percentage of 3.43 percent. It just seems like requiring a
concrete level spreader for essentially 7,000 square feet of impervious on the east and 3,000 SF of impervious on the
west side of the road is excessive. For drainage area IV which includes 2.33 acres of wooded land adjacent to the drive,
the width of the level spreader required would be 7 feet and on drainage area IIb which drains 1.02 acres with 3,000 SF
of impervious area would require a 3' level spreader. I only ask that you think through this decision prior to requiring
the property owner to spend the $10,000 per level spreader to get his driveway in for 10,000 SF of impervious area.
I would argue that the 3' wide level spreader for IIb not be required and that for IV we install a 10' earthen level
spreader or a small rip rap plunge pool with a T wide lip prior to the buffer.
I appreciate your time and thoughts.
Sincerely,
Stocks Engineering, PA
Y. <e-� �la,L X
J. Kevin Varnell