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401 McIntire Road, North Wing
County
of Albemarle
Charlottesville, VA 22902-4579
Telephone: 434-296-5832
COMMUNITY
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DEVELOPMENT DEPARTMENT
WWW.ALBEMARLE.ORG
Road Plan review
Project title:
Worrell Drive Improvements — ROAD PLAN
Project file number:
SUB2021-00115
Plan preparer:
Malachi Mills, PE / Rummell, Klepper & Kahl, LLP
2100 East Cary St., Suite 309, Richmond, VA 23223
MMILLS@RKK.COM
Owner or rep.:
Worrell Land and Development Company LC
P.O. Box 5386, Charlottesville, VA 22905 worrell
e cstone.net
Plan received date:
23 Jun 2021
(Rev. 1)
22 Oct 2021
(Rev. 2)
3 Feb 2022
(Rev. 3)
1 Mar 2022
(Final)
23 Mar 2022 / digital link, RKK email, March 23, 2022 11:24 AM
Date of comments:
26 Jul 2021
(Rev. 1) 9 Dec 2021
(Rev. 2) 25 Feb 2022
(Rev. 3) 2 Mar 2022 /email
(Final stamped) 8 Apr 2022 / link, digitally -approved plan —ROAD Plan Approved
Note: ACSA `No objection,' 3/9/22
Reviewer: John Anderson, PE
SUB201-00115; Engineering review comments:
1. Remove sheets C11.00, C11.01, C11.02 from the Road Plan, and include with WPO plan and application.
Please submit WPO plan at earliest convenience. WPO plan approval is required concurrent with Road
Plan approval. (Rev. 1) Addressed,
2. C2.00: Label Worrell Office Driveway, Driveway Jl, Small Drive Jl. (Rev. 1) Addressed.
3. Please remove 0 sheet of ROAD Plan (.PDF) if not relevant (it appears to be blank, or empty). (Rev. 1)
Addressed,
4. C4.00, Existing Conditions: Show and label Ex. storm pipe elements downstream of Ex. DI at Int. Martha
Jefferson Drive and Worrell Drive. (Rev. 1) Addressed,
5. Remove ESC elements from C5.00, 5.01, 5.02 (demolition elements may remain). ESC and SWM design
elements are to be shown (reviewed and approved) with a WPO plan (application), but not a ROAD plan
application. (Rev. 1) Addressed.
6. C6.00:
a. Label Worrell Office Driveway, Driveway Jl, Small Drive Jl. (Rev. 1) Addressed.
b. Label width of Worrell Drive at periodic intervals. (Rev. 1) Addressed.
c. Proposed R =112' is less than VDOT standard Min. R' horizontal curves, for typical design
speeds. (Rev. 1) Persists. Applicant response (letter d. 10/20/21): `Worrell design shall be updated
to show a min, of 155' to meet VDOT standard min. at the current design speed (25 MPH) (Per
VDOT Geometric Standards for Urban Local Street Systems (GS-8)'. Layout C6.01 appears to
show CL radii of horizontal curvature < 155' (112', 125', Sta. 9+50 and 6+25, respectively).
Please clarify design intent. (Rev. 2) Persists. Applicant response (1/21/22 RK&K Memo):
`Existing road alignment along Worrell Drive from Sta 4+25 to Sta 10+48 is to be maintained as
this portion is the section to just be widened, no realignment is proposed.' Engineering was not
involved in prior discussion to plat Worrell Drive as private access, defers to Planning Division,
Engineering Review Comments
Page 2 of 4
acknowledges Road plan proposes slight widening only from Sta. 4+25 to 10+48, acknowledges
drivers that customarily transit Worrell Drive may be familiar with existing horizonal curvature,
but others may not. Centerline radii along certain sections do not meet VDOT standards. For this
reason: Propose caution signs adequate to alert motorists approaching low radius horizontal curves
(in either direction) at sections that do not meet VDOT minimum CL horizontal curvature (155').
For example: A series of yellow reflective background /black chevron signs to indicate tight curve
ahead, or alternate single signs messaging same to approaching drivers that curves ahead are tight.
When CL radius does not obtain VDOT Min. R for design or posted, inertial force may draw
vehicles across centerline, or off road. Please propose messaging signs with next submittal. (Rev.
3) Addressed.
d. Provide VDOT/AASHTO* basis of design. For example: Road Design Manual, Appx. B(1).
* AASHTO Guidelines for Geometric Design of Low -Volume Roads, 2019
( https://aashtoioumal.org/2019/05/31/aashto-issues-second-edition-of-low-volume-roads-
guidelines/ ) (Rev. 1) Addressed. Applicant: `Design is based in the parameters of the VDOT
Road Design Manual, Appendix Al, `Geometric Design Standards for Urban Local Street System
(GS-8).'
e. Provide design speed. (Rev. 1) Addressed.
f. Provide, show and label posted speed limit signs on layout plan view sheets, Worrell Drive. (Rev.
1) Addressed,
7. C6.00: To the extent CL of revised Worrell Drive departs existing private street easement recorded at DB-
PG 642-290, show and label revised private street easement. Provide easement plat, as needed. (Rev. 1)
Persists. Applicant: `Revised private street easement shall be updated on sheet C6.00. Easement plat shall
be provided.' (Rev. 2) Addressed. Applicant: `The CAD files have been sent to the surveyor for
processing. They will provide the easement plat for review.'
8. C6.00. C6.0 1, C6.02: Please add Worrell Drive centerline stationing, every 100', with tick marks at more
frequent intervals. (Rev. 1) Addressed.
9. C7.00. C7.01. C7.02:
a. Similar to review item #5, above, please remove ESC symbols /elements from the road plan.
Retain grading information. (Rev. 1) Addressed.
b. Label new path width opposite Worrell Office Driveway. (Rev. 1) Addressed.
c. Label traffic control signs. (Rev. 1) Addressed.
d. Label CG-12. (Rev. 1) Addressed,
10. C7.00:
a. Provide ADT basis of pavement design. (Rev. 1) Addressed.
b. Provide pavement design based on ADT: DR, DP. (Rev. 1) Addressed, Using RK&K Memo d.
10/20/21: ADT =313 VPD, calculated DR =10.7. Ref heavy-duty asphalt section, C6.0, DP
=11.48. DP>DR.
c. Provide Worrell Drive pavement section depth/s for stone, sub -base and surface asphalt. Label
Worrell Drive section (depths). (Rev. 1) Addressed. C6.0.
11. C7.01:
a. With road plan, provide analysis of hydraulic effect of Worrell Drive storm discharge to pond
upstream of the road. At this point, Worrell Drive is a pond embankment. If hydraulic effect is
negligible, provide supporting hydraulic data that compares pre- /post developed 10-yr event flows
not simply through structures proposed to discharge to the pond, but through the existing structure
that connects upslope /downslope ponds, passing beneath Worrell Drive. (Rev. 1) Partially
addressed. Afollow- up:Please confirm that routing data shown on C 11.05 indicate that the 36"
RCP that connects the ponds beneath Worrell Drive has adequate capacity to convey the 10-yr
event, which appears to route /model as QPe,r,10,r=569.08cfs. Provide LD-229 storm design
computations for this existing 36" RCP pipe, that reflect modeled results. (Rev. 2) Addressed.
HydroCAD 10-yr event routing, C 11.05, indicates 0.014% increase (post v. pre) for Pond 2.
Applicant: `Storm calculations have been added to 2yr and 10yr tables on sheet C 11.03. The
capacity and surface elevations remain the same within pre and post conditions. Calculations on
Engineering Review Comments
Page 3 of 4
the pond capacity have also been added through use of a HydroCAD model, which can be found
on sheet C11.04 and C11.05.'
b. Show /label Ex. pipe structure (type, length, DIA) that connects ponds, that passes beneath
Worrell Drive. (Rev. 1) Addressed.
c. Please provide discrete (pond routing) analysis. (Rev. 1) Addressed.
d. Storm conveyance must discharge to a manmade network, natural receiving stream, or defined
drainage channel. Revise discharge at 4-1 and 5-1 to discharge to a defined drainage channel (by
extending pipe to a point that is a defined drainage channel, or natural receiving stream). (Rev. 1)
Addressed. Aulicant: `Design shall be updated to show a level spreader to dissipate discharge at
4-1 and 5-1 outfall structures.'
12. C7.02:
a. Pipe table lists pipe slope, 3-1 to 3-2 as 0.5, while C9.00 lists slope as 0.47%. Pipe slope <0.50%
should be revised to meet Albemarle Engineering Drainage Plan checklist for plan reviewers, Min.
slope, =0.50% [ item 3, pg. 2; checklist /Attached]. (Rev. 1) Addressed.
b. Label asphalt path. (Rev. 1) Addressed.
c. Provide asphalt path cross-section. (Rev. 1) May persist. As follow-up: perhaps overlooked,
please direct reviewer to sheet detail showing asphalt path cross-section. (Rev. 2) Addressed.
d. Revise outfall structure 3-2 to ensure discharge is to a manmade system, natural receiving stream,
or defined drainage channel. (Rev. 1) Addressed. Applicant: `Design shall be updated to show a
level spreader to dissipate discharge at 3-1 outfall structure.'
13. C8.00:
a. Please show proposed vertical alignment in lower half profile, Sta. 4+25 — 10+48.34 (end project).
(Rev. 1) Withdrawn. Applicant: `Along section of Worrell Drive (4+35-10+48.34), existing
grades are to be maintained and existing road widened in that section.'
b. Provide vertical curve at Sta. 2+61.19 to transition from 4.51% to 1.04% grade. Transition is
abrupt, without VC. Smooth vertical curve is required to transition between grades. (Rev. 1)
Addressed.
c. Recommend label points of intersection with intersecting driveways (Worrell Office Driveway,
Driveway I for example). (Rev. 1) Addressed.
14. C8.01: Recommend Worrell Office Driveway Min. Ks,g of 15.00 (typical of pvt./public streets) for safe
illumination of vertical sag curve after dark. (Rev. 1) Addressed.
15. C9.00:
a. Revise proposed 0.47% storm line grade, 3-1 to 3-3 to 0.50%, Min. (Rev. 1) Addressed.
b. Immediately upstream of line 3-1 to 3-3 is a storm line at 0.50%. Three storm pipes are proposed
at Min. pipe slope, 0.50%. Pipe installed at flatter slope (<0.50%), As -built, condition, requires
Engineer confirm adequate self -scour velocity and capacity in As -built condition. Pipe < Min.
pipe slope may need to be replaced (along with riser section/s) to ensure adequate fall, capacity,
and self -scour velocity. Engineering recommends design slope 0.55% or greater, to allow leeway
during construction. (Rev. 1) Addressed.
c. Storm profile Storm Sewer Ex DI to 1-2 indicates 18" DIA pipe/s feed into an existing storm
structure with 15" DIA INV OUT. This is atypical; revise to ensure existing DI structure and
existing pipe network for this storm pipe run are adequate to convey anticipated development
runoff. I.E.: Examine /route existing storm pipe network downstream of Ex. DI that receives
development runoff at Int. Martha Jefferson Drive and Worrell Drive. See existing condition at
Ex. DI, C4.00. (Rev. 1) May persist. Applicant: `Design shall be revised to provide existing
network downstream, and analysis shall be made to determine if 15" is adequate for design.' As
follow-up: Please provide (analysis) findings of system adequacy of proposed v. existing storm
pipe. (Rev. 2) Addressed. Applicant: `Storm calculations have been revised and existing
downstream system is adequate for proposed 15" storm sewer pipe connection, which are shown
on sheet C 1 LOY
16. C11.03: Unless overlooked, provide spread (4 in. event) for DIs on Worrell Drive. (Rev. 1) Partially
addressed. Applicant: `Spread calcs have been updated.' As follow-up: It appears that C 11.03 has been
removed from the road plan set. Please restore this sheet to the road plan so updated spread calcs may be
Engineering Review Comments
Page 4 of 4
checked. (Rev. 2) Addressed. Engineering defers to RK&K on inlet 3-3. C 11.03 includes caption below
table with inlet values: `* Inlet 3-3 is receiving flow from the hillside over the curb. Due to the nature of
the office building, only one lane needs to remain passable, which is met with the combination of inlets 3-3
and 3-2.'
17. If Worrell Drive, a private street, is to remain passable to thru-traffic during construction, provide narrative
sequence that discusses maintenance of traffic (MOT), lane restrictions, barriers, flagging requirements, or
any proposed limits on hours of construction activity (mill/pave, for example). Note: WPO Plan should
indicate location of staging area/s (contractor vehicles, equipment, material storage, etc.). (Rev. 1)
Addressed, As follow- Engineering recommends Note/s to contractor, barriers, labels, etc. on the road
plan to control and limit pedestrian access to areas closed to vehicles during any phase of construction. If
portions of roads are closed for construction, pedestrian intersections with roads under construction should
likewise be temporarily closed, with adequate barrier protection and public notices that help ensure
pedestrian safety. (Rev. 2) Addressed. Applicant: `We have added notes on the MOT plan sheets
temporarily closing pedestrian intersections /path segments accordingly. We have provided additional
notes on the Sequence of Construction for the Contractor to add safety fence as necessary to ensure
pedestrian safety during the different phases. We have also specified in the Maintenance of Traffic notes
that when sidewalks /pedestrian path closures are implemented, the paths shall be closed using type 3
barricades and the sidewalk closed in accordance with the latest revision of the 2011 V WAPM.'
Thank you.
Please call if any questions — tel. 434.296-5832-x3069, or email 4anderson20albemarle.org.
SUB202100115 Worrell Drive Improv RP 030222rev3 Approv.doc