HomeMy WebLinkAboutSUB201400197 Review Comments Road Plan and Comps. 2014-12-12Y�
COMMONWEALTH of VIRGINIA
DEPARTMENT OF TRANSPORTATION
1605 Orange Road
Cutpeper Virginia 22701
Charles A. Kilpatrick, P.E.
Commissioner
December 10, 2014
Mr. Max Greene
County of Albemarle
Department of Community Development
401 McIntire Road
Charlottesville, VA 22902
Re: SP -2014 -00197
Dear Mr. Greene,
We have reviewed the Road PIan Amendment for the Hyland Ridge subdivision, as submitted by
Dominion Engineering, with a signature date of November 21, 2014 and offer the following
comments:
1. If 20 mph design speed is utilized, a 20 mph advisory speed limit sign shall be posted
along with any other horizontal or vertical curve warning signs as warranted (see table 1-
Curb and Gutter Section Notes in Appendix B(1)- Subdivision Street Design Guide).
2. The following note should be added to the plans: Stockpiles material shall be tested and
inspected by VDOT prior to placement within the ROW.
3. Representative soil samples for CBR test shall be taken to ensure that properly
compacted subgrade soil will produce a stable platform for pavement construction. The
compaction shall be 100 percent of the standard proctor.
4. Stone sewers that are to be maintained by VDOT shall be bedded and backfilled in
accordance with PB -I of the VDOT Road and Bridge Standards.
5. Underdrains (UD -1) should be shown on the road typical section, the location of
crossdrains (CD -1) should be shown on the profile and their VDOT standard details
should also be provided.
6. Safety slabs (SL -1) shall be required as part of the drainage design for manholes and
dropinlets with heights greater than 12'. Also steps (ST -1) shall be required with heights
greater than 4'.
7. Slopes that incur uniform velocities in excess of 10 fps should be avoided because of the
potential for abrasion.
S. Storm structures such as D -125 and D -118 should be located outside of the ROW and
shall be privately maintained.
9. Errors have been found for the following pipe lengths (Plan vs. Profile): D -103 thru D-
101, D -106 thru D -104, D -125 thru D -124
10. We feel that it is acceptable for lot drainage to sheet flow over the curb, provided that the
downstream curb inlets are adequately sized to carry the extra Q. If grate inlets are
necessary the 10 yr WSE should be provided to insure that the water will not overtop into
the road.
11. HGL's should be provided.
12. Ditch computations for the 10yr and 2yr storm events should be provided to ensure that
the ditches, within VDOT ROW, contain the 10yr storm and achieve a minimum
freeboard of 18" and to ensure they are properly lined. A typical cross - section of the
proposed ditches should also be provided.
13. Multiple runs of storm sewer are reaching their maximum allowable height of cover for
HDPE pipe.
14. Standard 13I -313's have a maximum depth of 8'. The profiles should be updated to reflect
the structure depths.
15. The Inlet comps should clearly identify the structure types. le: DI -1 vs DI -5
If you need further information concerning this project, please do not hesitate to contact me at
(434) 422 -9373.
Sincerely,
Shelly A. Plaster
Land Development Engineer
Culpeper District
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