HomeMy WebLinkAboutSDP200900033 Review Comments Final Site Plan and Comps. 2010-04-21Summer Frederick
From: DeNunzio, Joel D., P.E. [ Joel .DeNunzio @VDOT.virginia.gov]
Sent: Wednesday, April 21, 2010 10:44 AM
To: Summer Frederick
Cc: Amy Pflaum
Subject: SDP - 2009 -00033 University Village -Phase I -Final
SDP - 2009 -00033 University Village -Phase I -Final
Summer,
I have reviewed the plan and have the following comments:
1. Show the design speed on the road as 35 mph on sheet R -4 in the Street Design Data table. Sight distance needs
to be in accordance with page F -35 of VDOT's Road Design Manual, Table 2 -7. SDR is 455 feet and SDL is 425 feet.
Sheet S -2 shows incorrect intersection sight distance.
2. The road section labeled "Proposed Grade Boulder Road Extension" on the sanitary sewer profile on sheet S -5
indicates that the rotation point for superelevation is at each of the median curb faces and the contours also show this
rotation. This is an incorrect application of the standard TC -5.01 standard, Details of Superelevation About Baseline.
Refer to VDOT standard TC -5.01 drawing 802.07. The rotation point is to be applied at the center of the median at a point
where the proposed pavement would meet if there was a flush median.
3. Show the design speed of 35 mph on the profile on sheet R -1 instead of the posted speed. Design features are all
based on the design speed.
4. The minimum radius for a horizontal curve from AASHTO is for the inside driving lane centerline. When there is a
multiple lane road with a 16 foot median, the value for 35 mph in AASHTO is 371 feet. The minimum centerline radius
needs to be increased by the distance of the center of the inner most lane to the center of the median. For Boulders
Road, the minimum centerline radius should be 371 +27 =398.
Show the superelevation rate, e, where the profile shows "Begin Full Superelevation". E =4%
6. Tangent runout, Lt, should be 71' and super runout, Lr, should be 142' according to TC -5.01 drawing 802.27. The
values shown on sheet R -1 are 63' and 125' respectively.
Show all horizontal curve data in accordance with page 2C -6 of the VDOT Road Design Manual.
Show stopping sight distance on crest vertical curves in accordance with page 2A -9 of the Road Design Manual.
The sight distance on the profile on sheet R -2 needs to be consistent with comment #1 above.
10. Curve C -7 should have superelevation, e =3.3 %, Lt =71' and Lr =118'. The super between curve C6 and C7 should
be applied in the same way as a reverse curve since these two curves create a broken back reverse curve.
11. Pavement striping needs to be Type A marking. Stop bars and crosswalks should be Type B Class IV.
12. Right turn lanes needs to be 12 feet just like the through lanes. Sheet R -3 shows an 11 foot turn lane.
13. Sheet R -4 needs to remove the minimum k value for crest curves. The design on the crest curves needs to be
shown as indicated in comment #8.
14. The minimum intersection sight distances on sheet R -4 need to be updated as indicated in comment #1.
15. Use 21 B in the subbase of the roadway structural section.
16. Lateral setbacks in accordance with the requirements of the Road Design Manual, page A -19, Low Speed
Roadways with Curbs, need to be shown on the typical sections. No fixed objects should be shown in the lateral setbacks
including street trees. It is recommended that the sidewalk and the trees are reversed to provide the minimum setbacks
required.
17. The Superelevation table at the bottom of sheet R -5 needs to be updated to reflect comments #4, #6 and #7.
18. UD -2 drains need to be shown on the low side of the superelevated sections of road.
19. DI -313's need to be used instead of 213's. There are no spatial restrictions and the combination will not make the
inlet length any less. Also, DI -2's are more difficult to access and cause depressions in the travel way when installed in
medians. Also, DI -213's or 313's have a max height of 9 or 8 feet respectively. Some proposed structures appear to
exceed that limit.
20. The curb inlet spreads on the median curbs cannot exceed 6 feet in accordance with Chapter 9 of the Drainage
Design Manual.
21. Gutter widths in the median should not be shown and the local depression is to be calculated as 1 inch for a
distance of 1 foot in accordance with standard drawing for DI -2 or 3.
22. Pavement cross slopes need to be indicated properly for DI according to the actual superelevation at a specific
cross section.
If you have any questions, please let me know.
Thanks
Joel
Joel DeNunzio, P.E.
Staff Engineer
434 - 293 -0011 Ext. 120
ioel . den unzioCcbvdot.viroinia.00v