HomeMy WebLinkAboutSUB201300091 Review Comments Road Plan and Comps. 2013-12-20Michael Koslow
From: Austin, Nathran. (VDOT) [Nathran .Austin @vdot.virginia.gov]
Sent: Friday, December 20, 2013 11:15 AM
To: Megan Yaniglos; Michael Koslow
Subject: SDP - 2013 -025 & SUB - 2013 -00091 Cascadia
Attachments: SDP - 2013 -025 Cascadia Final Site Plan Comments - 12- 19- 13.pdf
Megan and Michael,
It appears that the submittal of the site plan and the road plans for Cascadia are the exact same plans. As such, the
attached letter applies to both even though the letter indicates the site plan number.
Troy Austin, P.E.
Area Land Use Engineer
Virginia Department of Transportation
Land Development —South
Culpeper District
P.O. Box 1017
Troy, VA 22974
Phone: (434) 589 -5871
Fax: (434) 589 -3967
COMMONWEALTH of VIRGINIA
DEPARTMENT OF TRANSPORTATION
1601 Orange Road
Culpeper, Virginia 22701 -3819
Gregory A. Whirley
Commissioner of Highways
December 19, 2013
Ms. Megan Yaniglos
Senior Planner
County of Albemarle
Department of Community Development
401 McIntire Road
Charlottesville, VA 22902
Re: SDP - 2013 -00025 Cacadia —Final Site Plan
Dear Ms. Yaniglos:
We have reviewed the Final Site Development Plan for Cascadia, Blocks 4 -7 dated 4120113 with
revisions dated 11/27/13 as submitted by Dominion Engineering and offer the following
comments:
General Comments
1. All storm sewer lines need to maintain at least a 90° angle between each sewer line
segment. Sections in particular that need to be looked at are as follows:
a. Structure 3 — Structure 2 — Outlet
b. Structure 7B — Structure 7A — Structure 7
c. Structure 37A -- Structure 37 — Structure 36
d. Structure 21 — Structure 20 — Structure 19
e. Structure 27 — Structure 28 — Structure 29
f. Structure 32A — Structure 32 — Structure 31
g. Structure 35— Structure 34— Structure 33
2. There needs to be a noted added to the storm sewer profiles indicating that ST -1 steps
will be required in all structures with a 4' or greater depth.
3. A note needs to be added to the storm sewer profiles in areas that the storm sewer
structure is located within fill indicating that "Contractor shall place fill under inlet(s) at
95% compaction & embankment material shall consist predominantly of soil & be placed
in successive uniform layers not more than 8" in thickness before compaction in
accordance wl VDOT 2007 Road & Bridge Specification 303.04. After 3' vertical
placement of fill, contractor shall excavate recently laid fill and install compacted VDOT
std. 21A stone in an 8'x8' o.c. compacted 21A area centered on the inlet(s). Contractor
shall repeat this operation until an 8'x8' o.c. compacted 21A stone base in installed
between the existing ground and the proposed inlet(s) base in efforts to reduce the risk of
settling. Contractor shall provide VDOT wl fill compaction results prior to road
acceptance."
4. Several of the street trees are located too close to the intersections. Street trees should be
offset from the intersections in accordance with Appendix B(1) of the Road Design
Manual.
5. There are several inlets that are located just over the minimum of 2' from proposed
entrances. Typically, we like to see approximately 4' of separation to provide better
clearance of the inlets. When inlets are located at the end of the radius of new entrances,
there is a risk for vehicles to hit/run over the inlet as they turn into the entrance. This
creates to the potential of damaging the inlet and/or the vehicle.
Sheet 3 of 47
1. Several of the typical sections call for IM -19 placed between the aggregate sub -base and
the surface course. IM -19 is typically used as an intermediate course between a base
mix, such as BM -25, and a surface mix such as SM -9.5. The preference would be that
the IM -19 courses shown be replaced with BM -25. If the applicant would prefer to not
do this, we need a justification for using the IM -19.
2. The pavement design should consider future trips that are likely to occur as Cascadia
develops beyond the limits of this submittal. Glissade Lane in particular should be
looked at.
Sheet 21 of 47
1. Structures 48 and 54 need to be located outside of the right -of -way for Flat Waters Lane,
similar to the location of Structure 57. The previous review comment was referencing
the fact that private structures were shown in the right -of -way more so than the fact that
they were Nyloplast.
Sheet 26 of 47
1. The inlet information for Structure 4 does not match the inlet information for Structure 4
as shown on a profile on Sheet 27 of 47.
Sheet 29 of 47
1. All storm sewer upstream from Structure 47 will be privately owned and maintained and
should be reflected as such on the profiles.
2. Structures 63 and 64 do not meet the minimum depth as shown in the 2008 Road and
Bridge Standards.
3. The storm sewer downstream from Structure 63 will not be maintained by VDOT.
If additional information is needed concerning this project, please feel free to contact me.
Sincerely,
Troy Austin, P.E.
Area Land Use Engineer
Culpeper District
VirginiaDOT.org
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