HomeMy WebLinkAboutSUB201600092 Review Comments Road Plan and Comps. 2016-12-06Charles A. Kilpatrick, P.E.
Commissioner
COMMONWEALTH of VIRGINIA
DEPARTMENT OF TRANSPORTATION
1601 Orange Road
Culpeper, Virginia 22701
December 6, 2016
County of Albemarle
Department of Community Development
401 McIntire Road
Charlottesville, VA 22902
Attn: Matthew Wentland, P.E.
Re: North Pointe Subdivision, Section I — Road Plans
SUB-2016-00092
Review #2
Dear Mr. Wentland:
The Department of Transportation, Charlottesville Residency Transportation and Land Use
Section, has reviewed the above referenced plan as submitted by Townes Site Engineering, most
recently revised 7 October 2016, and offers the following comments:
I. Please label streets on the Overall Plan and Grading Plans. Also, please correct the scale
on the Overall Plan, Sheet C-2A.
2. Most crosswalks near the roundabouts are not angled at the splitter island but continure
straight across, however some do not, please explain.
3. Please remove the pedestrian crossing near the Northfork Drive intersection with
4. The pool house entrance on Northfork Drive does not meet corner clearance spacing
requirements. An access management spacing exception, in which we would expect an
analysis of the entrance and expected queuing, will be required.
5. All Grading Plan Sheets C4 to C4C — (a) Please provide legible labels of horizontal
road geometry to the grading plan sheets (e.g. PC's; PT's). (b) Please provide legible
street names with their respective design speeds. (c) Please remove all fire hydrant
control valves from the street pavement areas; fire hydrant control valves are to be
installed behind the curb per the fire hydrant detail on Sheet C-9B. (d) Label
roundabouts.
6. Grading Plan Sheet, C-4 — (a) guardrail should be specified in fill sections of roadway
where finished roadway grades are 6 vertical feet or more higher than the adjacent finish
ground grades; this would include much of Crosscreek Drive. Please provide guardrail
warrant worksheet(s).
7. Grading Plan Sheet C-4A — Although the cul-de-sac is designated as a temporary turn-
around it is at the end of a 700-foot long road that will serve approximately 13 lots for an
unspecified period of time. As such it will need to be constructed to standard cul-de-sac
criteria, with the exception of installing curb and gutter around the perimeter, as follows:
(a) make the cul-de-sac radius 45' OR a 40' radius with No Parking signs specified
around the perimeter; (b) reduce the centerline slope of the cul-de-sac from its current
6.5% to 4.0%; (c) label the station of the radius point and edge of pavement at the end of
the cul-de-sac; (d) label the radius of the cul-de-sac that is to be utilized; (e) specify a
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Matthew Wentland, P.E.
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barricade type to be used at the end of the cul-de-sac at the top of the fill section; (f)
label the end of the curb and gutter at or near the curb drop inlets and specify how to
transition drainage from gutter flow to the roadside ditch.
8. Grading Plan Sheet, C-4B — label the cul-de-sac radius on Northfork Court. It appears to
be 45' .
9. Drainage Structure Summary Sheet C-41) — (a) verify that RCP Class III pipe is of
adequate strength for the deep -install sections of pipe; (b) Per the Drainage Manual and
Road and Bridge Standards, Detail 106.14, SL-1, Safety Slabs are required for manhole
and drop inlet structures greater than 12 feet in height. This specification with the
required number and spacing of the slabs should be listed for each applicable structure.
10. On all Street Profile Sheets.- (a) underneath the street name list the design speed and the
corresponding minimum allowable Sag and Crest K values; (b) Per the Road Design
Manual, Appendix B(1), page 22, a 50' landing at 2% maximum grade is required.
Additionally, please show stopping sight distance and K values per the design speed at
each street intersection and at all vertical curves.
11. Road and Drainage Profile, Sheet C-7 — (a) there appears to be a missing centerline
intersection label at about 13+60, please verify that all pipe crossings are shown on the
profiles; (b) label Roundabout 2 on the profile from about 19+75 to 21+50 (similar to the
horizontal arrow used for the vertical curves); there appears to be a missing pipe label for
Pipe #17 on the storm profile.
12. Road and Drainage Profile, Sheet C-7A — (a) an intersection landing, per item 6 above, is
needed at 30+50.
I3. Road and Drainage Profile Sheet C-7B — (a) the vertical curve at 25+80 must be
redesigned to the appropriate Sag K value; this will likely affect the crest vertical curve at
28+80; (b) label Roundabout #1 as occurring from 23+50 to 25+50.
14. Road and Drainage Profile, Sheet -C-7C — (a) label Roundabout #2 as occurring from
41+50 to 44+00; (b) redesign the vertical curve at 43+80 to the appropriate crest K value;
(c) label the slope of the tangent (-4. l6%n) at approximately 33+75.
15. Road and Drainage Profile Sheet C-713 — (a) redesign the vertical curve at 14+40 to the
appropriate sag K value; this will likely affect the intersection elevation of NorthFork
Drive (b) Show the intersection sight distance at 14+40; (c) the intersection sight distance
labeled 19+00 to 23+50 should be corrected to 280'.
16. Road and Drainage Profile, Sheet C-7E — (a) the vertical curves at 28+40 and 29+50 must
be redesigned to the appropriate K values; (b) there appears to be an incorrect intersection
label at 28+75; (c) label the items listed for the cul-de-sac revisions from comment #3
above, onto the profile and show the slope of 4% or less.
17. Road and Drainage Profile, Sheet C-7F— (a) adjust the starting elevation at 10+00 as
necessary from comment #11 above and design a landing per comment #6 above; (b)
there appears to be an incorrect intersection label at 14+25; (c) redesign the vertical curve
at 14+75; (d) design an intersection landing for the intersection at 20+75.
18. Road and Drainage Profile, Sheet C-7G — Label Roundabout #1 as occurring from 16+20
to I 8+25.
I9. Typical Sections, Sheet C-9C — (a) Show the "decorative wall" on the Cross Creek
section, outside of the street right-of-way; (b) Provide alternative typical sections for
locations that may require guardrail.
20. Please include pavement design worksheets (submitted on separate 8.5 x 11 pages) on
Sheet C-9A.
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Matthew Wentland, P.E.
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Roundabouts
21. Include the fastest path calculations (`R' values) as recommended in the NCHRP
guidelines.
22. The approach deflections still do not appear to be acceptable. The `R' values above
should show if these are adequate. Some reverse curves on the approaches may be
needed to achieve acceptable deflections.
23. The auto -turn analyses appear to be adequate. However, it appears that the approaches
have been designed based on these analyses. Note that larger vehicles can use the apron
if necessary to traverse the roundabout.
24. It is also recommended and that the last 20 feet of the approach be a tangent section that
aligns with the receive path so the vehicle is pointed toward the lane not the apron.
25. Consider offsetting the entries to the left slightly to provide room for the deflection. Note
that the exit lane does not need much deflection, similar to a pinwheel.
26. Roundabouts that are on a grade (tilted plane) will require special drainage design to
insure the water drains properly away from the apron and does not freeze during the
winter weather conditions. Please consider revising the roundabouts so their profiles are
on plane (i.e. a landing at each entry).
Please provide two copies of the revised plan along with a comment response letter. If further
information is desired, please contact Justin Deel at 434-422-9894.
A VDOT Land Use Permit will be required prior to any work within the right-of-way. The
owner/developer must contact the Charlottesville Residency Transportation and Land Use
Section at (434) 422-9399 for information pertaining to this process.
Sincerely,
ohw' . 4ZL'1__
Adam J. Moore, P.E.
Area Land Use Engineer
Charlottesville Residency
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