HomeMy WebLinkAboutSDP200800072 Review Comments Final Site Plan and Comps. 2009-01-21From: Denunzio, Joel D., P.E. [ Joel .Denunzio @VDOT.virginia.gov]
Sent: Wednesday, January 21, 2009 2:52 PM
To: Amy Pflaum
Subject: FW: SDP - 2008 -072 Old Trail Blocks 15 & 31
Amy,
I have reviewed the above site plan and have the following comments:
1.. The intersection sight distance on Old Trail Dr. needs to be based on the
design speed of Old Trail Dr., not 20 mph.
2.. The profile on Glen Valley Dr. at stations 20 +40 and 24 +53 +/- needed to
have appropriate K values. K values that are lower than the minimum at stop
conditions are for the transition of a cross slope of an intersecting road.
When the K values are lower than standard at distances away from this transition
area, in this case the sags are 40 feet and 60 feet from the crown of the
intersecting road, the substandard values can cause stopping sight distance
safety issues during night time driving conditions. The VPI at station 24 +53
should be moved to station 24 +08.09 at an elevation of 677.09 and a 10 foot VC
should be applied. The grade between this VPI and station 25 +70 should then be
2.01 %. The inlet at the sag should be located to appropriately drain the water.
3.. The longitudinal slopes for all the grade inlets are computed with a 0.005
value.
Please note that VDOT recently has updated its Standards Book and all drawings
used in future plans should reflect the new standards.
If you have any questions, please let me know.
Thanks,
Joel
Joel DeNunzio, P.E.
Staff Engineer
434 - 293 -0011 Ext. 120
joel.denunzio @vdot.virginia.gov
From: Hamidi, Ajmal
Sent: Friday, July 25, 2008 01:23 PM
To: 'myaniglos @albemarle.org'; 'mgreene @albemarle.org'
Cc: Denunzio, Joel D., P.E.
Subject: SDP - 2008 -072 Old Trail Blocks 15 & 31
SDP - 2008 -072 Old Trail Blocks 15 & 31
Megan Yaniglos,
We have reviewed the above site plan and have the following comments:
Geometrics
a.. The grades on Claremont Lane need to be shown on sheet R -1.
b.. The entrance to the Private Alley from Fielding Run Drive does not conform
to the CG -11 standard because of the steep grade on the Private Alley between
stations 13 +00 and 13 +15 (see sheet R -3).
c.. The sight distance lines should be drawn for the intersection of Old Trail
Drive and Glen Valley Drive. The VDOT right -of -way should also be shown on Old
Trail Drive. If the sight distance lines move outside the right -of -way, a sight
distance easement will be needed.
d.. The K- values for the sag vertical curves on Glen Valley Road with PVI
stations 20 +40.00 and 24 +53.54 are 10.13 and 5.39 respectively. Table 5 on
sheet R -3 states that the minimum K- values for a sag vertical curve with a 20
mph design speed is 20.
Drainage
a.. According to HDA 08 -03, the maximum allowable spread for an inlet adjacent
to a parking lane or a bike lane is 10 ft. If the inlet is not adjacent to a
parking lane or bike lane, the maximum allowable spread is defined as '/� driving
lane + gutter width in chapter 9 of the VDOT Drainage Manual. Since the driving
lane is 10 ft wide and the gutter is 2 ft wide, the maximum allowable spread is
7 ft. Drainage structures 9, 17, 23, and 25 have left, right, or inlet spreads
which exceed 7 ft.
b.. Underdrains (VDOT standard UD -4) are needed underneath the curb and gutter
sections where the traffic volume is greater than or equal to 1000 vpd.
Underdrains are also recommended underneath curb and gutter sections where the
volume is lower.
If you have any questions, please contact Joel DeNunzio or me.
Thanks,
A. J. Hamidi
EIT
Charlottesville Residency
(434) 293 -0011