HomeMy Public PortalAbout2013_01_08_O004 DCSM Amendments for Crescent Design DistrictThe Town of
Leesburg,
PRESENTED: January 8, 2013
ORDINANCE NO. 2013 -0 -004 ADOPTED: January 8, 2013
AN ORDINANCE: TO AMEND LEESBURG DESIGN AND CONSTRUCTION
STANDARDS MANUAL ARTICLES 5,8 AND APPENDIX A TO
ESTABLISH CONSISTENCY WITH THE CRESCENT DESIGN
DISTRICT
The Council of the Town of Leesburg in Virginia hereby ordains:
SECTION I. That the Leesburg Design and Construction Standards Manual is hereby
amended by the adoption of revisions to Articles 5, 8 and Appendix A as set forth in Attachment
1 hereto.
SECTION Il. All prior ordinances in conflict herewith are hereby repealed.
SECTION III. Severability. If a court of competent jurisdiction declares any provision
of this ordinance invalid, the decision shall not affect the validity of the ordinance as a whole or
any remaining provisions of the Leesburg Design and Construction Standards Manual.
SECTION IV. This ordinance shall be effective March 1, 2013.
PASSED this 8th day of January, 2013.
A E T
Clerk of CoUnc 1
P: \Ordinances\2013 \0108 Crescent Design District DCSM Amendments.doc
r'
Kris en C. Umstattd, Mayor
Town of Leesburg
DCSM AMENDMENTS ARTICLE 7
TRANSPORTATION
TABLE OF CONTENTS
SECTION 7 -100 PRELIMINARY STREET PLANNING .............................. ............................... 1
7 -110
General Requirements 1
7 -111
Preparation of Traffic Studies 1
7 -112
Approval of Traffic Study 6
7 -113
Coordination of Traffic Studies with Construction Drawings 7
7 -114
Coordination of Traffic Studies with Site Plans 7
SECTION 7 -200 STREET FUNCTIONAL CLASSIFICATIONS ............. ............................... 9
7 -210 General 9
7 -220 Street Classifications 10
SECTION 7 -300 STREET DESIGN REQUIREMENTS ........................
7 -310 General Criteria
7 -320 Curb & Gutter
7 -330 Service Drive
7 -340 Curb Cut Ramps
7 -350 Guard Rail
7 -360 Entrances onto the Public Right -of -Way
7 -361 Spacing of Entrances onto the Public Right -of -Way
7 -362 Entrances
7 -363 Pipestem Driveways
7 -364 Common Driveways
7 -365 Maintenance Access Road
7 -370 Residential Parking Courts, Private Travelways, and Alleys
7 -371 Sight Distance
7 -380 Noise Abatement Facilities
7 -390 Traffic Control Devices
............... 12
16
19
19
20
21
22
23
23
26
27
30
31
34
35
39
SECTION 7 -400 PAVEMENT DESIGN REQUIREMENTS ............. ............................... 41
7 -410 Preliminary Minimum Pavement Design 41
ATTACHMENT
7 -111
ARTICLE 7
TRANSPORTATION
SECTION 7 -100 PRELIMINARY STREET PLANNING
7 -110 General Requirements
All streets constructed in conjunction with subdivision plats, construction
drawings and or all types of site plans, construction plans and/or capital
improvements plans shall be designed to comply with the geometric standards of the
Virginia Department of Transportation (VDOT) except as modified by the Design
and Construction Standards Manual. The standards set forth herein require that
design be based on projected traffic volumes and functional classification. For
purposes of this article "site plan" shall include Final Site Plan and Minor Site Plan.
2. When development proposes to:
a. Relocate existing streets or roads.
b. Encroach upon existing public rights -of -way or easements with physical
improvements.
The Developer shall be responsible for replacement of the road, street, and right -of-
way or easement on new location during development of the property. Such
replacement shall be to the standards and specifications set forth in this Manual,
shall be approved by the Director, and shall be at no cost to the town.
All projects subject to the Virginia Department of Transportation 527 Traffic Study
requirements shall obtain applicable approvals from VDOT prior to approval of
subdivision and /or site plans.
7 -111 Preparation of Traffic Studies
All preliminary plat and site plan submissions which contain or are adjacent to roads
which cant' or are proposed to carry more than 500 vehicles per day (VPD), shall
have a traffic study prepared by a Professional Engineer. This traffic study shall
only be required to the point where the site generated traffic is less than or equal to
15 percent of the total roadway volume excluding site traffic or (when applicable) as
required by a VDOT 527 Traffic Study. The following information shall be
provided for each entrance and street intersection at the year of completion and 20
years from the date of completion:
7 -1
TRANSPORTATION 7 -210
SECTION 7 -200 STREET FUNCTIONAL CLASSIFICATIONS
7 -210 General
Functional classification is the process by which streets and highways are grouped
into systems according to the character of service they provide or are intended to
provide. It is a method of organizing the network of streets into hierarchies of travel
movement for comprehensive transportation planning.
The hierarchy of functional classification in the Town of Leesburg shall be:
A. Limited access facilities.
B. Major (principal) arterial streets.
C. Minor arterial streets.
o This road type within the "Crescent Design District" would he
referred to as an "Urban Boulevard ". Design criteria for these
specific roads shall generally follow the minor arterial street criteria
unless certain design elelments are specifically modified as set forth
in this manual and or Section 7.10 of the Zoning Ordinance.
D. Through collector streets.
E. Local collector streets.
o This road type within the "Crescent Design District" would be
referred to as "General Street ". Design criteria for these specific
road types shall generally follow the local collector streets criteria
unless certain design elelments are specifically modified as set forth
in this manual and or Section 7.10 of the Zoning Ordinance.
E Local streets.
o This road type within the "Crescent Design District" would be
referred to as "Residential / Optional Street ". Design criteria for
these specific road types shall generally follow the local streets
criteria unless certain design elelments are specifically modified as
set forth in this manual and or Section 7.10 of the Zoning
Ordinance.
The urban functional classification is applied to the entire network of streets in the
Town of Leesburg. Refer to Detail TD -2 of this Article for a graphic ilh+stration of
these classifications.
7 -9
TRANSPORTATION 7 -300
B. Geometric Design Guides for Tertiary Subdivision Streets (9):
B. Geometric Design Guides for Cul -de -sacs, Loops, and Other Streets of
Fixed Vehicular Generation (8):
With Curb
Absolute
and Gutter
Projected
Minimum
1111nimum
Vehicles
Minimum
Stopping
Distance
Minimum
Functional
Per Dar
Maximum
Design
Sight
Face to Face
Right -of-
Classification
D)
Terrain
% Grade
Speed
Distance
Curbs
Way
(1)
(MPH)
00
(ft)
(ft)
0 -250
Rolling
1 9(3) 1
25 1
125(6)
(4)
60(7)
Local Street
B. Geometric Design Guides for Cul -de -sacs, Loops, and Other Streets of
Fixed Vehicular Generation (8):
D. Footnotes:
(1) Determination of functional classification by projected vehicle
counts is presented as a guide for residential subdivisions and
planned developments and may be modified by the Director to
account for individual site differences.
(2) On principal arterial, minor arterial, or through collector streets with
a traffic count of more than 2,000 VPD there shall be no direct
access from one and two - family residential driveways.
(3) Grades of relatively short lengths (up to 300 feet) may be increased
to ten percent absolute maximum. Approval by the Director is
required and design rationale must show that such steep grades will
not cause an intolerable maintenance situation.
7 -13
With Curb
Absolute
and Gutter
Projected
Minimum
Minimum
Vehicles
Minimum
Stopping
Distance
Minimum
Functional
Per Day
Maximum
Design
Sight
Face to Face
Right -of-
Classification
(VPD)
Terrain
/. Grade
Speed
Distance
Curbs
Way
(I)
(mpll)
(ft)
(fe
(ft)
0 -250
Rolling
9(3)
25
125(5)
(4)
60(7)
Local Street
251.500
Rolling
9(3)
25
125(5)
(4)
60(7)
Local Street
D. Footnotes:
(1) Determination of functional classification by projected vehicle
counts is presented as a guide for residential subdivisions and
planned developments and may be modified by the Director to
account for individual site differences.
(2) On principal arterial, minor arterial, or through collector streets with
a traffic count of more than 2,000 VPD there shall be no direct
access from one and two - family residential driveways.
(3) Grades of relatively short lengths (up to 300 feet) may be increased
to ten percent absolute maximum. Approval by the Director is
required and design rationale must show that such steep grades will
not cause an intolerable maintenance situation.
7 -13
7 -300 TOWN OF LEESBURG DESIGN & CONSTRUCTION STANDARDS
(4) Minimum face to face curb dimensions take into consideration
parking on the street as follows:
a. No Parking ....... I ........ 26 feet
b. Parking on one side in "Crescent Design District "...30 feet
c. Parking on one side ...... 29 feet
d. Parking on both sides in "Crescent Design District" ... 38 feet
e. Parking on both sides .... 34 feet
(5) Minimum face to face curb dimensions take into consideration
parking on the street as follows:
a. No Parking ................ 26 feet
b. Parking on one side in "Crescent Design District" ... 30 feet
c. Parking on one side ...... 31 feet
d. Parking on both sides in "Crescent Design District "...38 feet
e. Parking on both sides .... 36 feet
(6) Sufficient stopping sight distance must be provided to safely
accommodate realistic operating speeds notwithstanding the
suggested design speed shown in the tabulation. In addition, all
intersection sight distance shall meet current VDOT standards.
(7) A minimum 60 feet of right -of -way is required. Increased widths
may be provided in increments of two (2) feet, as necessary to
accommodate the full roadway elements including cut or fill slopes.
Right of way widths for all roadway typical sections within the
"Crescent Design District" shall conform to standards set forth
in Section 7.10 of the Zoning Ordinance. Widths shown provide
accommodation for sidewalks on both sides of the street. The
minimum right -of -way width may be reduced when applicable
circumstances warrant such a reduction such as when required street
trees are planted outside the right -of -way due to design constraints or
parking is not permitted on one or both sides of the street.; however,
in no instance shall a reduction in right of width be granted for
properties located within the "Crescent Design District ".
(8) Due to the normal density of development adjacent to residential
subdivision streets, standard curve super - elevation is not practical;
therefore, on local streets with less than 1,000 projected vehicles per
day (VPD) where the posted speed is 25 mph, no super - elevation is
applicable. On local collectors with traffic volumes between 1,000
and 2,000 VPD and the posted speed is 25 mph; the maximum
7 -14
TRANSPORTATION 7 -300
super - elevation rate shall be 0.0208 ft/ft (reverse crown). For
arterials or through collectors with projected volumes exceeding
2,000 VPD or where the posted speed is greater than 25 mph, super -
elevation and pavement widening should be provided in accordance
with:
(a) Standard TC -4 of Virginia's Department of Transportation
road design standards when performing rehabilitation work
on existing pavements originally constructed utilizing TC -4.
(b) Standard TC -5 of Virginia's Department of Transportation
road design standards when performing reconstruction of
existing pavements or when building pavements on a new
location.
(9) Due to local nature of streets and low design speed, curve super -
elevation is not required.
2. Each street should have continuity of design throughout. Therefore, multiple or
"step down" typical designs will not be acceptable except where a major traffic
generator such as an intersection with a collector street would delineate a clear line
of demarcation.
An adequate public and private turnaround shall be provided at the end of dead -end
or cul -de -sac streets to allow safe maneuvering by service vehicles, highway
equipment, and school buses. A minimum 45 -foot pavement radius and 57 -foot
right -of -way radius is required for public cul -de -sac turnarounds with 3 ft min grass
strip (60 -62 ft right -of -way radius is required with 6 -8 ft min planting strip). Refer
to Standajd TS- 1, TS- IA and TS -2 in Appendix A.
4. Each cul -de -sac shall have a minimum of identifiable typical street sections equal to
the normal lot width between the intersecting street curb return and the beginning of
the circular turn- around. Absolute minimum length of typical street sections shall
be 75 feet (PC to PC). Refer to Standard TS -1 and TS -IA in Appendix A.
The minimum centerline radius to be used for local roads and streets with no super -
elevation shall be 250 feet.
6. For the purpose of this Article, "local streets" shall be defined as subdivision streets
with single family driveways.
7. Streets in areas zoned industrial shall have a minimum width, face of curb to face of
curb, of 52 feet, and a minimum pavement section as listed for through collectors.
7 -15
7 -310 TOWN OF LEESBURG DESIGN & CONSTRUCTION STANDARDS
All elements of roadway design must meet the Virginia Department of
Transportation road design standards except as modified to be more restrictive
herein. In situations where it is not clear as to whether VDOT's or the Town's
regulations are more stringent, the final design requirements shall be determined by
the Director.
9. Spacing of crossovers on divided highways shall be based upon the design speed of
the road and meet the requirements of the Virginia Department of Transportation's
Road Design Manual, latest edition.
7 -310 General Criteria
1. All rights -of -way shall conform to the standards as set forth in this Manual as well
as the Town's Zoning Ordinance.
2. For a subdivision that abuts one side of any publicly owned and maintained street,
the subdivider shall be required to dedicate one -half of any right -of -way necessary
to make such street comply with the minimum width established for same.
A. The Applicant may be required to dedicate more than one -half of the right -
of -way to improve the horizontal alignment or meet the minimum design
standards for that street.
3. Where required, easements with widths appropriate to the proposed purpose
intended shall be provided.
A. If the Applicant is unable to obtain the off -site easements necessary to
construct streets to the property line, it is permissible to stop the street
construction a distance from the boundary of the subdivision sufficient to
allow the proper slope to the boundary line, and provide a cash deposit for
future completion of the street to the boundary line. Please note that this
does not relieve the Applicant from meeting the requirements of Section 7-
310.2.
B. On -site grading easements shall be recorded to allow for future completion
of the street when the off -site area is developed. An on -site temporary
turnaround (cul -de -sac) shall be required. Costs for demolition of this
temporary cul -de -sac shall be included in the escrow amount.
7 -16
TRANSPORTATION 7 -310
4. A grade line of all proposed street construction shall include:
A. The minimum grade for curb and gutter which shall be one percent, except
that the Director may approve a modification to allow a decrease to one -half
percent based upon unusual topographic conditions.
B. The length of vertical curves with elevations and stations of vertical points
of intersection (P.V.I.).
C. Elevations shall be computed at the following locations:
(1) Centerline intersections of streets.
(2) Curb returns.
(3) At the beginning and the end of all vertical curves.
(4) Computed every 50 feet for all tangent sections, and every 25 feet for
all vertical curves.
D. The point of finished grade on typical sections (i.e. centerline, top of curb,
etc.) shall be indicated.
5. If a difference exists in elevations of proposed curb grades, curb elevations showing
top of right curb and top of left curb shall be shown on the plans.
6. A smooth grade shall be maintained from centerline of existing road to proposed
curb and gutter to preclude the forming of false gutters and /or the ponding of any
water on the roadway.
7. The maximum centerline grade across permanent cul -de -sacs may not exceed three
percent. However, steeper grades may be permitted in certain instances with prior
approval of the Director. The cul -de -sac spin out shall be designed such that the
grade profile of the proposed curb and gutter construction is computed along the top
of the curb starting at the beginning of the curb return and following the face of curb
around the cul -de -sac and ending at the point of return opposite the point of
beginning. Before entering the cul -de -sac grade, grade ties of the proposed street
shall be shown on each end of the cul -de -sac grade profile to ensure proper grade
connection.
8. A temporary turnaround / cul -de -sac shall be constructed in a public easement on the
abutting property at the end of a street which is intended to be extended with the
development of the abutting property.
7 -17
7 -310 TOWN OF LEESBURG DESIGN & CONSTRUCTION STANDARDS
9. When a proposed street parallels or is located near an existing stream or open
drainageway, elevations of the top of the stream bank, computed water surface
elevations and invert (or flow line) of stream or open drainageway shall be provided.
Street construction shall not encroach on the approved flood plain limit of the
stream except as provided for in Article 5, Flood Plain Policy.
10. Street construction shall be provided for the full fiontage of all lots.
11. Street landings shall be provided at proposed intersections to ensure adequate sight
distance in accordance with the latest VDOT design standards or Detail TD -3.
12. Roadside ditches shall be indicated, along with its computations, where the depth is
not in conformance with the standard street cross section.
A. Grade ties of the proposed street, before entering the cul -de -sac grade, shall
be determined on each end of the cul -de -sac grade profile to ensure proper
grade connection.
B. Other acceptable methods may be used subject to the approval of the
Director.
13. Cul -de -sacs shall be provided at the ends of all dead -end streets, except where the
extension of the street beyond an intersection serves only one lot on each side of the
extension.
14. Adequate ingress - egress easements shall be provided when more than one lot is to
use a common driveway. Refer to Standard TS -4 in Appendix A.
15. Traffic barricades and "NO THRU STREET" signs shall be located where required.
Refer to Standard TS-22 in Appendix A.
lb. Vandal -proof street name, stop, and yield signs shall be installed within the
dedicated public street right -of -way at all street intersections in a location
satisfactory to the Director based on the criteria used by the Virginia Department of
Transportation and MUTCD, latest edition. Refer to Standard TS-5 in Appendix A.
A. Stop or Yield signs shall be placed at intersections on those streets which
have the least amount of anticipated traffic.
B. Stop signs shall be placed at intersections where the potential for poor sight
distance would necessitate a full stop to increase safety.
7 -18
TRANSPORTATION 7 -330
17. All private street and private driveway signs that do not meet the vandal -proof sign
standard for use within the dedicated public street right -of -way shall be privately
owned and privately maintained.
18. A street name sign shall be required for all common private streets or pipestem
driveways indicating the private street name, where applicable, the house numbers,
and designation "private driveway."
7 -320 Curb & Gutter
1. Curb and gutter shall be installed for all new construction within the public right -of-
way and shall be Type CG -2 (header curb), CG -3 (header curb), CG -6 (curb and
gutter), CG -7 (curb and gutter) according to VDOT standards, or other types with
the approval of the Director.
2. The use of reverse or spill type curb and gutter (TYPE CG -6R) is not permitted
within the public right -of -way without prior approval of the Director. Refer to
Standard TS -6 in Appendix A.
7 -330 Service Drive
1. Whenever a development abuts a road which is included in the State system of
primary highways, a service drive extending for the full length of the development
along such a road, and providing limited access thereto, may be required.
2. Service drive construction shall conform to the geometric standards in Section 7-
300 based upon projected traffic volumes as set forth in this Manual.
Except where impractical by reason of topography, the area between the service
drive and the major thoroughfare or artery shall be sufficient to provide areas for
scenic planting and screening. The dimension of the area between the service drive
and major thoroughfare or artery and the points of access between the same shall be
determined after consideration of traffic safety requirements.
4. Intersections of roadways which have parallel service roads shall be evaluated on a
case by case basis for operation and safety. Capacity analysis of the roadway /service
road intersection may require elimination of movements from the service road via
use of channelization or termination at the corner lot.
7 -19
The Town of
Leesbur,a in Virkinia DESIGN AND CONSTRUCTION STANDARD
5' -0"
MIN.
MIN.
A
IMP`
f a
,f
f
v
2' DETECTABLE-' ' A .,---J 6"
WARNING STRIP TANGENT PLAN
SIDEWALK AREA W/
)R W/O BUFFER STRIP
611 81.01,
�� -- -
12:1 MAX
,
i
4"
SECTION A -A
8' -0" STD. CG -6
CJ'- On
MIN.
RADIAL PLAN
4' -0"
MIN. ` 48 :1 MAX. SLOPE 12:1 MAX.
SECTION B -B
NOTES:
1. ALL CONCRETE SHALL BE CLASS A -3.
2, RAMP SURFACE SHALL BE CONSTRUCTED WITH A NON -SKID FINISH AND THE
CROSS SLOPE OF THE RAMP SHALL NOT EXCEED 1/4 ":1'. LONGITUDINAL SLOPE
SHALL NOT EXCEED 12:1.
3. CURB CUT RAMPS ARE TO BE LOCATED AS SHOWN ON THE PLANS. THE RAMPS
SHOULD BE OFFSET FROM THE PEDESTRIAN CROSSWALKS, BUT SHOULD NOT BE
LOCATED BEHIND VEHICLE STOP SIGNS, EXISTING LIGHT POLES, ETC.
4. WHEN USED WITH V.D.O.T. STANDARD CG -3 OR CG -7, THE CURB FACE SHALL BE
ADJUSTED TO MATCH THE MOUNTABLE CURB CONFIGURATION. Nnf Tn
31ONS
I
CONCRETE CURB CUT
RAMP FOR BRICK
SIDEWALK
DRAWING
TS-8
PACaa
84
DATE:
0312010
The Town of
Leesburg' in Virginia DESIGN AND CONSTRUCTION STANDARD
IIHEADER E
74„
ARTICLE 7- 362.3A
/--v
fl 6' -0" M I t�I
4'4" BRICK(1)
9 -ORDA MAX. SLOPE - -0--
CONCRETE
HEADER
/` FINISHED
GRADE
\�
M
COMPACTED FILL ---"
14" SETTING BED
6" STONE BASE —
1j" WEEP HOLE W /SCREEN AND •
CLAMP. SPACED 30' TO 100' ON
CENTER DEPENDING ON SLOPE,
TYPICAL SECTION
NOTE;
1. SEE DRAWING TS -12F AND TS -12G STANDARD BRICK SIDEWALK SPECIFICATIONS
Not To Scale
REVISIONS DRAWN'G
DATE: TS -12B
NEW 03/2010 STANDARD BRICK SIDEWALK
WITHOUT CURB AND GUTTER PAGE
89
The 'Town of
Leesburk in Virzi.
R = (2) 11-611
5' MINIMUM TYP
12,6' DESIRABLE
25' MAXIMUM — f
o:
O
z o
4 O
in Z
Q
FACE OF CURB
is DESIGN AND CONSTRUCTION STANDARD
ARTICLE 7- 362,3A
WIDTH TO MATCH EXISTING OR _
�. AS,QTHERWISE- NOTED ON PLAN 6" CONCRETE HEADER
l �},t' 3,0t MIN. )
A /
4. .
D -D
OPTIONAL
SCORED
C -C JOINT—
«-
A --�—�
PLAN
MAX. SLOPE 12% (2)
FACE OF CURB
NORMAL GUTTER
i�-,
I
STANDARD A -3 CONCRETE
� 16"
b .
0 4
NOTES: SECTION B -B
SECTION A -A
2' -0"
• 4d • '
i'
SECTION C -C
5' MINIMUM
APRON
CONSTRUCTION JOINT
BRICK (1)
SETTING BED (1)
6" CONCRETE HEADER
0.5" MIN.
6" STONE BASE (1)
7" CONCRETE
21.0"
SECTION D -D
1, SEE DRAWING TS -12F AND TS -12G FOR STANDARD BRICK SIDEWALK SPECIFICATIONS
2, EACH OF THESE DIMENSIONS MUST BE SPECIFIED ON THE PLAN BY THE DESIGN ENGINEER.
Not To
STANDARD COMMERCIAL TS-12C
I
ENTRANCE WITH
BRICK SIDEWALK PAGE
90
The Town of
Leesburg in Viiginia DESIGN AND CONSTRUCTION STANDARD
CONCRETE HEADER (1) AND 112" ARTICLE 7- 362,3A
EXPANSION JOINT AT BUILDING
v -6" FOR NEW DEVELOPMENT
TYP. . 42'", OR MATCH EXISTING '
f 7' "2' -6" MIN. > 6" CONCRETE HEADER
A RAN
5K H
5'
-�- -r -ritsiIi�i�i�ill
1
• �1 111 - . - - - -1
1 1 1► . - .: 1111111
a
CONSTRUCTION JOINT -J I A ""`_j
`I FOR NEW DEVELOPMENT 14' -0" MIN.
OR EXISTING DRIVEWAY WIDTH PLUS 2'
PLAN
2' -6" MIN.
2, ' -0" 6" 3' -0" BRICK SIDEWALK
FACE OF CURB BRICK (1) - SETTING E3ED (1)
NORMAL GUTTER 2 6" CONCRETE
SLOPE I HEADER
7 10.6" MIN,
6" STONE BASE(1)
SECTION A -A 7" CONCRETE
NOTES:
1. SEE DRAWING TS -12F AND TS -12G FOR STANDARD BRICK SIDEWALK
SPECIFICATIONS.
2, LOT GRADING PLANS MUST PROVIDE FOR ADEQUATE VEHICULAR CLEARANCE
FOR DRIVEWAY APPROACH, DEPARTURE, AND BREAKOVER TRANSITIONS.
3. DRIVEWAY PROFILES ARE REQUIRED WHERE STEEP GRADES (6% OR MORE)
ARE PROPOSED.
STANDARD RESIDENTIAL TITI2D
ENTRANCE WITH
BRICK SIDEWALK PACE
91