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ROUDABUSH, GALE &ASSOCIATES, INC.
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LAND SURVEYING Saving V rrinia Sirar 1956
ENGINEERING 914 MON rICE1.1.O ROAD
LAND PIANNING
CHARLOTTESVILLE,VIRGINIA
WILLIAM J.LEDBETTER.LS. 22902 J.CLINT HARMON.LS.
DAVID M.ROBINSON.P.E. DAVID A.JORDAN.LS.
AMMY M.GEORGE.LA. BRIAN D.JAMISON.LS.
KRISTOPHER C.WINTERS.LS.
June 8, 2016
John Anderson, Civil Engineer II
County of Albemarle
Department of Community Development
401 McIntire Road,
Charlottesville,VA 22902
Regarding: SUB-20160-0021 Road Plans Old Trail Village Blocks 10, 16, 17 & 18
Mr. Anderson, I have reviewed your comments from May 15, 2016 and below are the individual
responses.
Blocks 10, 16, 17, 18 & 30 (block 30 Added with Rev. 1)
1. Sheet 1 —Revise index sheet 24 description to include ACSA Details. (Rev. 1)
Addressed.
2. Sheets 6, 7, 8—Reposition and add CG-12/curb ramps to face streets at
perpendicular angle. This is a recurrent VDOT comment(other
projects). Please respond to VDOT comments on this ROAD Plan.
(Rev.
1)Partially addressed. As follow-up: to extent practical, street crossing
between opposing curb ramps should be perpendicular to the street to
minimize crossing distance, avoid potential pedestrian confusion, and
minimize pedestrian-vehicle conflicts. To extent practical,revise
placement of opposing curb ramps, particularly at: Golf
Drive/Fielding Run,Golf/Rowcross St,Upland Drive/Fielding Run,
and Highgate Row/Upland Drive intersections.
• CG-12/curb ramps have been repositioned in a
perpendicular manner as requested.
1. Previous comment:"Diagonal curb ramps force pedestrians descending the ramp to proceed into
the intersection before turning to the left or right. Therefore, they are not recommended for new
construction. "Curb Ramp Application Details"for new construction can be found in Appendix A
of the Road Design Manual". I.e. The ramps located at the intersection of Watervale Drive and
Crozet Ave.should also be adjusted accordingly.
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3. All sheets—Please reference SDP201600006 and WPO201600009
preview comments. Revise ROAD Plan as needed. (Rev. 1)
Acknowledged.
4. Sheet 7—Add stop sign label, Bayward St./Rowcross St. (Rev. 1) Addressed.
5. Sheet 12—Revise design;replace three(3)existing storm pipes.
Run-off(CFS) exceeds pipe capacity: (Rev. 1)Not addressed. 3
May 2016 Applicant response: "We [RGA] are preparing a
comprehensive analysis of the existing storm sewer system that
drains to this area. There appears to be a difference between what
was planned and what was built. This analysis will follow under a
separate cover."
a. Ex. 9-14 to 9-12
b. Ex. 9-12 to 2-18
c. Ex. 2-18 to 2-16
(Rev. 1)As follow-up: Run-off(CFS)exceeds pipe capacity at
additional location(ref.storm sewer design table, 5/3/2016:
•
d. Point 16 to 15: Revise design.
6. Sheets 12, 13, 14—Label pipe structures,plan view(Assign IDs). (Rev.
1) Partially addressed. As follow- up:
a. Label structures between inlets
15 and 17 (2 pipes; 1 MH) b.
Label pipe#s 52, 54, 56, 58
(sheet 12); 79 (sheet 13).
• All structures have been
labeled as requested.
7. Sheet 14—Revise pipe DIA between inlet 123 and 121; run-off
CFS exceeds pipe capacity. (Rev. 1) Addressed.
8. Sheet 16—Provide landing/Sta. 10+11.75 — 10+51.75, Aldersgate Rd -40-ft. at 24-8
4% or less (can be within first road/vertical curve). (Rev. 1)Addressed.
street grade is less than 4% for a minimum of 40' from the edge of pavement of the
intersected street. (This grade can be within the first road curve which transitions from
the 2% intersected cross grade) {policy, follows ord. for travelways 18-4.12} (ROAD
Plan review checklist)
9. Sheet 16—Provide VC transition: -2.08%to -1.54%, Beechen Lane. (Rev. 1) Addressed.
10. Sheets 16-19/CD-1 (Rev. 1) Addressed, except as noted (d.)
a. Shift CD-1 to proposed/existing grade point of intersection. At one location, 50'
away.
b. Provide CD-1 at every vertical sag curve.
c. Provide CD-1 at every proposed/existing grade intersection.
d. As follow-up:provide CD-1 at Upland Drive, Sta. 23+50±.
• CD-1 has been provided as requested.
11. Sheets 16-19/inlets—Revise inlets shown above/below proposed grade. (Rev. 1)Addressed.
12. Sheet 17/Petyward Lane—Provide stationing along horizontal axis (profile). (Rev. 1)
Addressed.
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13. Sheet 18—Provide tangent or vertical curve data @ begin construction, Rowcross St. (Rev.
1) Addressed.
14. Sheet 19—Recommend revise 0.50 and 0.51% slope storm drains—ref storm sewer
schedule. (Rev. 1) Withdrawn(review checklist explicitly states minimum slope for a
storm pipe). Please see Drainage Plan review checklist: item 3, pg. 2 (slopes at 0.5%
min. to 16%max. (per VDOT stnds for anchors over 16%)).
15. Sheets 20, 21 —Revise inlets shown above/below proposed grade. (Rev. 1) Addressed.
16. Sheet 20—Storm Sewer Profile#53-#59: Show existing grade. (Rev. 1) Addressed.
17. Sheet 21 —Revise storm sewer notes which seem to blend step, safety slab, and inlet
shaping notes. (Rev. 1) Addressed.
New (Rev. 1)
18. Minor text edit—Check spelling of Aldersgate Row across plan sheets.
• Road spelling has been confirmed as Adlersgate Row and revised
across pan sets.
19. Sheet 8—Provide horizontal geometry for Rowcross Street EP-EP transition from 26' to 32'
width.
20. Sheets 9, 10, 11 (storm drain design)—Also see 4"/6.5"inlet design sheets (Also: 14-
410.G.,Drainage) Note: county requires and recommends a more conservative
design.
Revise design to:
a. Provide L/Lt>1.0 at inlets 103, 105, 107, 111 (3 of 4 inlets located on inside of
110' R 20 mph curve).
b. 36 inlet structures are 2' or 2.5' in length. This represents significant departure
from past,more conservative Old Trail Village ROAD Plan storm drain
design's. Provide design rationale for carryover at every single non-sag inlet.
Carryover should be a design exception,not the rule. Carryover at every inlet
during a 6"in/hr. event worsens in every less frequent storm event.
c. Eliminate carryover at Inlets 43, 59, 66, 68, 90 (locations not arbitrary;
evaluated against grade). Carryover at these locations strands water below each
inlet,where it pools.
d. Provide spot elevations to guide construction at Inlets 123, 125, 129, 133, 135, 137.
e. Revise inlets to ensure gutter depth< 1.5"(0.125') on private streets with roll top
curb. This requires conservative evaluation of inlets on Aldersgate Row,Beechen
Lane,Petyward Lane, and Priory Terrace. Note, for example, inlets 11, 84, 86, 92,
94, and 96—all located on roll top section streets with gutter depth>1.5"(at
inlet). Despite transition to CG-6 at inlets,there is unknown effect through roll-
top sections prior to CG-6 transition. 2"roll top (ht.) vs. 6"CG-6 suggests impact
to multiple dwellings under current design. A 25-yr event will have an even worse
effect.
f. Identify inlet 5 as a sag inlet. Provide spread(4 in/hr.) at inlet 5.
g. Reduce spread at inlets 109 and 117. This request is supported by_14-410.G IF-
text image,below. (Spread at these inlets should reduce with design revision
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requested at a., above.)
h. Limit spread, inlet 68. Permissible spread for Upland Drive=2' + %travel lane
width, or 2' +
.5(13'), or 8.5'. Design proposes 9.46'
spread. 14-410.G.
G. Drainage. Adequate drainage control shall be provided for streets by installing culverts
under streets;side,lead,or outlet ditches;catch basins; curb inlets;or any other devices,including piping,
as.-determined=to be ildcessa y:by_the_county_.Egineei: All of these improvements shall meet the standards
of the county or,in the event no county standards exist,Virginia Department of Transportation standards.
21. Sheet 18—Minor: Match line with sheet 19 splits VC data. Show entire VC data on either
sheet 18 or 19.
• Data has been shown on both sheets for optimal clarification.
22. Sheet 32—Recommend revise block 10 plant list table title to include ref. to block 30 in title
as well,if true.
• Not true, block 30 does not require canopy calculations.
If you have any questions or comments,please feel free to contact me.
Sincerely,
(2..e.A4Afrvy )
Jeremy L. Fox
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