HomeMy WebLinkAboutSDP201300012 Checklist 2013-02-20 T • • • 1 `� ` t Ie ..! i.��E / of A
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Firm:
This checklist must be completed, signed and submitted with the application. The information contained in this checklist
reflects the contents of the Section 32 of Chapter 18 of the Code of the County of Albemarle also known as the Site Plan
Ordinance as of January 1, 2013. The applicant is responsible for insuring that no revisions to the Ordinance have
occurred since preparation of this document.
Plans which lack the information required by this checklist shall be deemed to be incomplete and shall be denied by the
agent with ten (10) calendar days after the applicable submittal deadline [Section 32.4.2].
An initial Site Plan shall contain the following:
1 4 32.5.1 aJ Number of copies.
❑ Sixteen (16) clearly legible copies in blue or black ink of the plan shall be submitted.
X32.5.2 lb] Scale and s ize.
❑ The plan shall be prepared to the scale of one (1) inch equals twenty (20) feet or to another scale approved by the
agent in a particular case. No sheet shall exceed forty-two (42) inches by thirty -six (36) inches in size.
❑ The plan may be prepared on one (1) or more sheets. If prepared on more than one (1) sheet, match lines shall
clearly indicate where the several sheets join.
❑ The top of the sheet shall be approximately either north or east.
❑ [32.5.1c] Dimensions.
❑ The plan shall be dimensioned to at least the following standards for accuracy:
❑ Boundary, setback and zoning lines: One foot in one thousand (1:1,000) feet.
❑ Existing contours: One -half (1/2) of the contour interval required in section 32.5.2(d).
❑ Proposed contours: Within five (5) feet horizontally and vertically.
❑ Existing structures, utilities and other topographic features: Within five (5) feet.
❑ Proposed structures, roads, parking lots and other improvements: Within five (5) feet.
❑ [32.5 a] General information.
,Ia The name of the development;
ames of the owner,
• eveloper and individual who prepared the plan;
rt� tax map and prrcel number; i-R- — I $ tee as :1.- , eti,i ar e l
,af( boundary dimensions;
De ning district
scriptions of all proffers, special use permits and conditions thereof, special exceptions and conditions
thereof, varian,:.es and conditions thereof, application plans, codes of development and bonus factors applicable
o the site;
agisterial district;
� ounty and state;
s orth point;
cale; one datum reference for elevation (where section 30.3, flood hazard overlay district, is involved, United
States Geologi,al Survey vertical datum shall be shown and /or correlated to plan topography);
. kithe source of the topography;
m eparting lot lines;
inimum setback lines, yard and building separation requirements;
he source of the survey;
heet number and total number of sheets; and
+ 1 the names of t e owners, zoning district, tax map and parcel numbers and present uses of abutting parcels.
11- ` C( 0 " ' 1.C-K "f9-',County of Albemarle
Department of Community Development
�' iii -,;& 1 'C ; 401 McIntire Road Charlottesville, VA 22902 Voice: (434) 296 -5832 Fax: (434) 972 -4126
0\414- )irj i 5Itt Li Revised 1/1/2013 Page 1 of 4
County of Albemarle - Initial Site Plan Checklist
❑ [32.5.2 J Information regarding the proposed use.
Written schedules or data as necessary to demonstrate that the site can accommodate
-the proposed uses,
..e- including proposed uses and maximum acreage occupied by each use;
0 number of dwelling units by type including the number of bedrooms for multifamily dwellings;
y!? 'gross residential density;
L quare footage of recreational areas; . 4
•. the percentage and acreage of open space;
maximum square footage for commercial and industrial uses;
maximum floor area ratio and lot coverage for industrial use;
maximum height of all structures;
✓2' chedule of parking including the maximum amount required and the amount provided;
.b the maximum amount of impervious cover on the site; and
r e if a landscape plan is required, the maximum amount of paved parking and other vehicular circulation
areas.
❑ 32 cJ Phase lines. -F11111-) '
f 'l.t/ If phasing is planned, phase lines and the proposed timing of development. S t L - 4 v
❑ [32 .2 oil Topography and proposed grading.
E xisting topography (up to twenty [20] percent slope, maximum five [5] foot contours, over twenty [20] percent
slope, maximum ten [ 10] foot contours) for the entire site with sufficient offsite topography to describe prominent
and pertinent offsite features and physical characteristics, but in no case less than fifty (50) feet outside of the site
unless otherwise approved by the agent;
4 proposed grading (maximum five [5] foot contours) supplemented where necessary by spot elevations;
•areas of the site where existing slopes are critical slopes.
- - [32.5.2 el Landscape features.
✓✓ ❑ The existing landscape features as described in section 32.7.9.4(c). .,,)Lc >,:� cl ? 7 Lx. ? - is k.A.4 j C41/4/ -
[3;5.2 fJ Watercourse. and other bodies of water.
The name and location of all watercourses and other bodies of water adjacent to or on the site;
,FX indicate whether the site is located within the watershed of a public water supply reservoir.
xy-[3�j gJ Onsite sewage system setback lines.
.Z1 The location of onsite sewage system setback lines from watercourses including intermittent streams and other
bodies of water.
/■:([3 .. plain.
,l 1 Th.2 e one hJ F 1ood hundred y ear flood plain limits as shown on the official flood insurance maps for Albemarle County.
❑ [32.5.2 iJ Streets, easements and travelways.
The existing and proposed streets, including
proposed bike lane ?
access easements S
7 D alley easements and rights -of -way, and travelways, _ ; , 1,(Lr �� „ 1\.1 ac4,.e c \� 4 Cup 2
- together with street names, �� r1�.� ei1lrrtii
(a� = � - `7
Zi state route numbers,
right -of -way lines and widths, L i
, -
centerline radii anc pavement widths. b r 1 )1 ULY--- itie J ` 4 `"
I NN CA t2x. z- - I on-a.; rr>pet — ,� s �,�.
1 ,� �/ 4, ok�k `
Revised 1/1/2013 Page 2 of 4
County of Albemarle - Initial Site Plan Checklist
❑ [32.5.2 jJ Existing sewer and drainage facilities.
gi The location and size of
❑ existing water and sewer facilities and easements,
❑ the storm drainage system,
❑ drainage chanrels, and
�
' ❑ drainage easenients.
111 [32.5.2 kJ Proposed sewer and drainage facilities.
❑ The proposed conceptual layout for
❑ water and sewer facilities and
❑ the storm drainage system, indicating the direction of flow in all pipes and watercourses with arrows.
/[32. .2 lJ Existing and proposed utilities.
The location of other existing and proposed utilities and utility easements,
including existing telephone,
Z
JQ lectric and
as easements.
12 in] Ingress and egress.
2TThe location of existing and proposed ingress to and egress from the property,
,❑ Show the distance to the centerline of the nearest existing street intersection from the proposed ingress and egress.
❑ [32.5.2 n] Existing and proposed improvements.
❑ The location and dimensions of all existing and proposed improvements including
4 ❑ buildings (maximum footprint and height) and other structures;
❑ walkways;
fences; c {i:v„�v.S:cti,•,._ Vw _ -- "� s, ,
walls; v.; , oak tir.C,i..,.«. _. .,.:A,.) jn`mi'r1`, c;.nS — l , cc! A i s-to : .>a,L.� ' "-t-/
trash containers; L '> ,�- ,',�� �'
,, I outdoor lighting; t j // ) 1
❑ landscaped areas and open space;
L! b AC__Y L'.. c.A 1 t c -h 1" -f'C Z - - �tl i ( l
'- q recreational areas and facilities; ,,, kY`«. x C� °� t �.� Cc t_� 1 � •, NA-- ,
parking lots and ot'rer paved areas; l � ,- oo\A
.,0' loading and service areas; _ `J�C �- w�� c ?� �� �vic
❑ signs; and
.-�-- the proposed paving material types for all walks, parking lots and driveways. -•, ,,"(C,, 0,-.
04- II 4..r t' - ti; _
_. ❑ \ [32. of Areas to be dedicated or reserved.
❑ All areas intended to be dedicated or reserved for public use under sections 32.7.1.1, 32.7.1.2 and 32.7.1,.x, and
❑ shall include a note on the plan stating that the land is to be dedicated o for public e.. - 19- 6 Q r S
[32.5.2 pi Landscape plan. .� Cc� \`�f\t� o r ' , �<<wv. 6 , ST . �,�ic c - S_kt... - 4 - 41 r
❑ A landscape plan that complies with section 32.7.9, if it is required to be submitted with the initia plan. �r�, �
[3 .5.2 qJ Traffic generation figures. G ' �' r
If deemed appropriate by the agent due to the intensity of the development, estim traffic generation figures for J
e site based on current Virginia Department of Transportation rates;
indicate the estimated number of vehicles per day and the direction of travel for all connections from the site to a
public street.
,[32.5.2 r] Symbols and abbreviations.
❑ A legend showing all symbols and abbreviations used on the plan.
❑ [32.5.2 s] Additional information.
❑ The agent may require additional information to be shown on the initial site plan as deemed necessary to provide
sufficient information for the agent and the site review committee to adequately review the plan.
Revised 1/1/2013 Page 3 of4
County of Albemarle - Initial Site Plan Checklist
Grading Permit Requirements — If you will be looking to obtain a grading permit and the initial plan is approved and you
have satisfied the conditions of approval identified by the agent in the letter required by section 32.4.2.5(c) then a separate
Water Protection Ordinance Application for an Erosion and Sediment Control Plan must be submitted for review and
approval
In addition to the items required by the ordinance, Albemarle County Engineer, Groundwater Program Authority,
the Virginia Department of Transportation, the Albemarle County Service Authority, and the Thomas Jefferson
Health District require these items on plans submitted for initial approval. Plans will not be rejected if these items are
not present, but they are required for approval. These items are provided in an effort to communicate all initial
comments.
❑ 1. Reference the benchmarks used for surveys. (Albemarle County Engineering Policy)
❑ 2. Indicate the availabl : sight distance for entrances and left turn lanes. (Albemarle County Engineering Policy)
❑ 3. Label the maximum height of all retaining walls. (Albemarle County Engineering Policy)
❑ 4. Provide copies of off -site easements, or letters of intent to grant them from off -site property owners. (Albemarle
County Engineering Policy)
❑ 5. Show and label stream buffer limits. (WRPA Ordinance)
❑ 6. Indicate the deed book and page reference for all existing utility easements located on the property. (Albemarle
County Service Authority)
❑ 7. Tier 3 - Draft Groundwater Management Plan (17 -403)
❑ 8. Tier 4 — Aquifer testing work plan (17 - 403)
Read and Sign
In representing the above referenced firm submitting this plan for initial approval, I hereby sate that, to the best of my knowledge, the
attached plat contains all information required by this checklist.
Signature of Owner, Contract Purchaser, Agent Date
Print Name Daytime phone number of Signatory
Revised 1/1/2013 Page 4 of 4
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Albemarle County Engineering
Final Plan Checklist
Page 1 of 12
SDP2013 -00012 Fifth Street Station - Initial
ALBEMARLE COUNTY COMMUNITY DEVELOPMENT J \ �} 1 ' 1
ENGINEERING REVIEW 0
FINAL PLANS CHECKLIST
11 Apr 2008 (Use the latest checklist at the time of submittal from www.albemarle.org)
Application information: (applicable to any type of plan)
�J Completed applications and fees (SDP, W etc) [18-32.4.3.2, 1 8- 32.3.9, 17 -203, 17-
3 0 3 ] - ltlu ila
� a C copies of federal and state permits (Army i s, VDEQ, etc) [Policy]
. , X A completed copy of the standard stormwater maintenance agreement and fee for
recordation for any stormwater management facilities [ 17 -304E]
)C copies of manufacturer's approval of the plan for any manufactured stormwater
management facilities (filterra, stormfilter, sandfilter, etc.) [Policy]
X pro -rated share payment for any sites which drain to County regional stormwater
management facilities. (This should have been identified with the preliminary plan/plat)
[ 17 -316]
Pk Verify in CountyView if the parcel is subject to rezoning or special use plan proffers. If
s o, print the proffers and verify applicable conditions have been met.
P ° cti-
Title information: (applicable to any type of plan)
project title [18- 32.6.6]
f professional seal, signed and dated for site plans, major amendments, stormwater plans,
or road and drainage plans [18-32.6.1]
vicinity map [ 18- 32.6.6]
Existing conditions information: (applicable to any type of plan)
✓ accurate current existing topography at the time of submittal, including all existing site
features, and any recent disturbances, all at a legible scale [18- 32.6.6, 14 -302]
date and source of the topographic information: All topography should be at least
visually field verified by the designer within the last year [ 18- 32.6.6, 14 -302, Policy for
date]
--}� benchmark location, elevation and datum for topography. An existing utility or other
known position will suffice. [Policy]
WPO buffer limits; 100' from stream or wetland bank, 200' from reservoirs, or
floodplain limit if greater [I 7-317]
floodplain limits, including 100yr flood limits for any channel with a drainage area of
50+ acres [ 18- 32.6.6d, 14 -302]
x FEMA map and date references labeled for FEMA floodplain [Policy]
all existing easements (access, drainage, sight, sanitary easements, etc.) with deed book
references, locations and dimensions [ 18- 32.6.6. 14 -302]
_) all slopes 25% and over (critical slopes by County Zoning Ord.) are shaded [ 18- 32.6.6,
14 -302]
Proposed plan view information: (applicable to final site plans, road and drainage plans)
Grading: [ 18- 32.6.6, 14 -303]
•
1)
Albemarle County
Engineering Final Plan Checklist
Page 2of12
I proposed topography at minimum 2' contour intervals - tied into existing contours, as
well as all proposed site features. (Sites with less than 6' of grade change should consider
using smaller contour intervals.)
proposed slopes are all 2:1 (horizontal:vertical) or flatter [Policy]
jc proposed slopes steeper than 3:1 have low maintenance (not grass) ground cover
specified on the plan [Policy]
---/ existing critical (25 %) slopes are not disturbed, unless a waiver has been granted by the
Planning Commission for the disturbance. [ 18 -4.2, 14 -304]
/ retaining walls labeled with maximum height (walls require building permits according to
Building Official policy)
--� safety railing shown for retaining walls over 4' high (building permit may be more strict)
[Policy]
guardrail with VDOT designations shown for retaining walls next to parking or
travelways [ 18- 32.7.2]
Easements: [18- 32.7.4, Subdivision Ordinance, Article IV, Division 4]
all proposed permanent easements, dimensioned and labeled
Examples of easements are:
X( sidewalk easements for sidewalks to be maintained with streets
., private sanitary sewer easements for private lines crossing lots
✓ public sanitary sewer easements per ACSA
a., drainage easements for any drainage passing through the site from off -site, or for
drainage crossing proposed property lines.
stormwater management easements over all facilities and associated structures
and access
access easements
intersection or entrance sight easements
h grading or temporary construction easements
all drainage easements are a minimum 20' wide. Required width: 10' +(pipe dia. or
channel width) + 2'+ 2(depth -5'). The pipe, channel or structure must be within the 1 t l "' It `'
center third of the easement. [Policy to allow for adequate easement width for C'f
excavation]
no structures or trees within drainage easements [Policy to allow for excavation]
Entrances and right-of-way improvements: [per VDOT Subdivision Street Requirements]
all entrances with a VDOT designation (PE -1, CG -9a, etc) FL ; 10 3t^ , g1y , "S)
entrances do not exceed 4% grade for a distance of 40' from the intersected street,
measured anywhere in the entrance [18-4.12.] 7]
-74 unobstructed sight distance lines at entrances, less than 10' x Speed Limit of intersected
streets, measured from a point 10' off the edge of pavement of the intersected street
/ 12.5' minimum radii on entrances (or per VDOT requirements, typically 25' -35')
>4. VDOT approval is obtained for any plan affecting public right -of -way
�-� turn and taper lanes with lengths and widths labeled (taper at 12:1 with 12' lane widths)
Parking king and circulation: [ 18 -4.12]
1 100' on -site sight distance is maintained by use of curbed islands a minimum 6' off
building corners or other site obstructions.
curbing on all parking areas and travelways with VDOT designations (CG -2, CG -6)
loading and dumpster areas accessible at all times (not behind parking)
,/ all parking rows protected by curbed islands [Policy per 18- .4.12]
minimum 3' width of curbed islands [Policy]
2- Albemarle County
Engineering Final Plan Checklist
�` Page 3 of 12
-- all edges of pavement labeled (where there is no curbing)
parking areas do not exceed 5% grade anywhere, in any direction
. parking width x depth x aisle width is 9x18x24' or 10x18x20' (where a 2' grass
overhang is possible parking spaces can be 16' deep per detail 2)
X parallel parking spaces are 9'x20' (with a minimum aisle width of 20')
✓ loading spaces are 12'x25' (with a minimum aisle width of 24')
/ • travelways without parking are 20' wide measured from curb faces
v parking places are separated from entrances and streets (to prevent queuing onto streets) a
minimum 18' from back of the entrance radius [sep dist by county engineer ]
of sidewalk abutting parking is 6' wide (exclusive of curb), or bumper blocks are provided
(see reference details)
V sidewalks are a minimum 5' wide, exclusive of curb
one -way aisles have a 12' minimum width. (One -way circulation is only permitted when
approved with a preliminary site plan)
/ dumpster pads are 10'x10' with 8' in front for wheel bearing (total 18' depth)
Drainage: [ 18- 32.6.6d, 14 -305. 311 ]
✓ all proposed and existing storm sewer (with arrows indicating direction of flow where it
is not otherwise evident)
✓' principle access free of flooding during the 100yr storm
! site runoff and entrances do not drain into streets
.„,' concentrated runoff (lcfs or greater) does not run across travelways [policy]
drainage does not run across, through, or backwater in dumpster areas [ 18- 4.12.19]
i overland relief is provided for any drainage structure or inlet in case of clogging. The
failure of any system will not cause structures or yards to flood. [Policy, info per 14 -311,
18- 32.6.6s]
,/ direction of flow change (or deflection angle) in each drainage structure is 90 degrees or
greater (flow should not have to reverse direction)
'-9 labels on all drainage structures provided (and should match the drainage computations
and profiles)
provisions and easements for drainage across 3 or more lots. Dense development where
fencing, decking, etc is expected should provide yard inlets and pipes rather than ditches
Streets: [18- 32.6.6, 14 -304. Subdivision Ordinance Article TV Division 2, VDOT Subdivision
r ttv.s Street Requirements]
road plans meet preliminary plat approval and critical slopes waiver approval (if
applicable) conditions
all existing streets with labeled pavement and right -of -way widths, route numbers and
street names
all proposed streets, with right -of -way and street names
stationing at 50' minimum on all proposed streets, matching the street profile
street horizontal curve start point, end points and radii labeled, meeting standards (see the
reference details)
turnarounds provided on all streets or alleys (see the reference details)
street edge of pavement or curb radii labeled at all intersections and turnarounds (see
reference details)
roundabouts designed per VDOT and ASHTO guidelines (see reference details)
guardrail over any slope steeper than 2:1, wall, or drop -off greater than 4', with start and
end sections labeled, and VDOT designations (GR -2, GR -2a, etc.)
pavement markings dimensioned and labeled
n + �� Albemarle County
Engineering Final Plan an Checklist
Page 4of12
signs for traffic control shown and labeled: speed limit on all streets, stop signs at all
intersections
street name signs at every intersection [County Road Nanning and Property Numbering
Ordinance and Manual]
street tree locations, species and height or caliper
Plan detail information:
traffic generation and distribution summary (ADT's)
S t pavement designs
typical sections for proposed channels with locations referenced from the plan view
sheets
- 7 sidewalk detail or specification to be a minimum 4" stone base and 4" concrete of
3000psi at 28 days, or stronger. [specs are policy per 14 -422]
dumpster pad detail or specification to be a minimum 4" stone base and 6" concrete of
3000psi at 28 days, or stronger, reinforced with a minimum grid of wire reinforcing or #4
AS P bars at 12" on center. [specs are policy]
typical retaining wall details referenced from plan. A typical manufactures drawing for
segmental block walls, or VDOT reference, is acceptable, with any applicable safety
railings or guardrail shown.
5' details for any pipes or drainage structures through or under walls, showing endwalls,
casings, or structural measures to bridge pipes or structures
V Albemarle County general construction notes [policy]
Street profiles: (applicable only to road or street plans)
stationing at 50' minimum on all proposed streets, to match the plan view sheets
proposed centerline
existing ground centerline
labeled existing and proposed grade at each 50ft station point
vertical curves provided at all grade transitions
vertical curve start, vertex and end points labeled
vertical curve length and K labeled at each vertex, meeting required design values (see
reference details)
percent grades labeled for all road segments, meeting design values (see reference
details)
rural street intersections continue the -2% intersected cross grade for a minimum of 20'
from the edge of pavement of the intersected street. A low point is provided off the
intersected street. [policy, following 'DOT practice]
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]
pipe and utility crossings shown and labeled
cross drain locations shown and labeled with VDOT designations (CD -1,2) at every
major cut and fill transition or sag curve
the station of intersections are shown and labeled with the street names
grades are a maximum of 6% in turnarounds
grades are a maximum of 4% through roundabouts
Street details containing: (applicable to road or street plans)
Albemarle County
Engineering Final Plan Checklist
Page 5 of 12
typical sections for each street, street segment, or alley
pavement widths meeting design standards
pavement crown at 1/4":1' slope
pavement surface, base, and sub -base thicknesses and materials
curb and gutter where applicable with VDOT designation (CG -6), and stone base of 6"
21 -A or better (CG -2 also acceptable if a gutter is not needed for drainage)
shoulder at 1":1' slope or flatter and 4' or greater width for rural sections
maximum slopes of 2:1 or flatter [policy]
proposed slopes steeper than 3:1 have low maintenance (not grass) ground cover
specified on the plan [Policy]
guardrail over all fill slopes and culverts, with 3' additional shoulder, using VDOT
designations (GR -2, GR -2A, etc.)
right -of -way /easement width, centered on street, meeting design standards
sidewalk location and widths, minimum 5' width, 4" concrete surface, 4" 21 -A stone
base, with underdrains (UD -4, etc) per VDOT standards where applicable
planting strip if applicable, 6' minimum width [ 14 -422]
ditches dimensioned at 3:1 slope from shoulder, 1' depth min., and 4' min. width from
shoulder to ditch centerline, for rural sections
alleys have 12' pavement width, with 14' wide stone base [ 14 -410]
transitioning detail (20' minimum) for roll -top curbing in front of any inlets
Albemarle County general construction notes for streets
c - 7 ? Drainage profiles: (applicable to site plans, road and drainage plans)
[14 -311, 18 -}2]
drainage profiles for each pipe, structure or channel must contain:
existing ground
proposed ground
any channel linings
all utility crossings
a VDOT designation (MH -1, DI -3B, etc.) for each structure
throat length for each drop inlet
grate type for each grate inlet
a label on each structure to correspond with the computations
material and strength class or gage of each pipe
manhole access every 300' for 15 " -42" or 800' for 48" or greater
pipe slopes at 0.5% min. to 16% max. (per VDOT stnds for anchors over 16 %)
concrete inlet shaping (IS -1) specified on any structure with a 4' or greater drop
safety slabs (SL -1) in any structure taller than 12'.
top or rim elevation for each structure
all invert elevations for each structure (with positive flow drop between inverts).
end sections (ES -1) or endwalls (EW -1) on all pipe outlets. Endwalls for culverts 48" or
taller
scour outlet protection at all outlets, corresponding to computations
Drainage computations: (applicable to any plan proposing pipes, channels, etc.)
\„ Pipe computations for all pipes
All proposed systems are designed within open channel full flow capacities.
Albemarle County
Engineering Final Plan Checklist
Page 6of12
For systems within drainage easements, all proposed pipes are a minimum 15" in
diameter
There are no excessive outlet velocities (> 15fps)
County Engineer approval has been obtained for existing systems which may exceed
open channel flow capacity
Curb inlet computations for any curb inlets on grade
All spreads are less than 10'
carryover is accounted for
100% capture at entrances so no flow runs out entrances into travel lanes
100% capture or overland flow of capacity storm to stormwater management facilities
Curb inlet computations for any curb inlets in sump conditions
All flow depths are below 6" in the capacity table
All spreads are less than 10'
100% capture or overland flow of capacity storm to stormwater management facilities
Ditch computations for any ditches
ditch linings specified per plans meet velocity requirements
Culvert computations for any culverts
headwaters < 1.5 x culvert height, and 18" below shoulder elevation of streets.
Outlet protection computations for all outlets
dimensions and stone sizes for all outfalls
Proposed pipe and inlet drainage area map
limits of all areas and sub -areas draining to proposed structures, and existing structures or
channels which will be impacted
acreage of each drainage area as used in computations
hydrologic coefficient for each drainage area as used in the computations
time of concentration for each drainage area as used in the computations
destination structure labeled for each drainage area
Stormwater management plan: (applicable to any plan containing stormwater management
facilities)
[17- 303,304, and the Virginia Stormwater Management Handbook]
Existing drainage area map:
existing conditions for site and off -site areas draining to proposed stormwater facilities
(The stormwater management analysis should not include off -site areas which do not
drain to proposed facilities)
drainage divides for all drainage areas to proposed facilities as used in computations
acreage of each drainage area, labeled on the map area and matching comps
coefficient used for each drainage area as used in comps
time of concentration for each drainage area where applicable as used in comps
Proposed drainage area map:
proposed conditions for the site and any off -site areas draining to proposed stormwater
facilities (The analysis should not include off -site areas which do not drain to proposed
facilities)
drainage divides for total drainage areas (not sub - areas) to proposed facilities, matching
the computations. Sub -areas may be shown on added exhibits or sheets.
acreage of each drainage area, labeled on the map matching comps
coefficient for each drainage area, labeled on the map matching comps
time of concentration for each area labeled on the map where applicable, matching comps
Albemarle County
Engineering Final Plan Checklist
Page 7 of 12
for future development to be considered in the analysis, include assumed land uses,
impervious areas, and hydrologic coefficients on the proposed drainage map
Plan view and details:
stormwater facility and site layout as shown on the site or subdivision plan sheets,
preferably at a scale of 1 " =30' or 1 " =20'.
90% or more of site development captured in facilities for water quality (ordinance 17-
312.0 requires as much as practical, 90% is a target)
Albemarle County general stormwater notes
facilities are not in the floodplain
facilities are not in buffer areas
facilities meet or exceed requirement removal rates
facilities are off -line of major streams
facilities are not built over any other utilities (sanitary sewer, water, gas, fiber optic, etc.)
permanent stormwater management easement encompasses 100yr high water mark, all
structures (embankments if present) and access
flow is not short- circuited, flow path is 2:1 or greater in all water quality facilities,
without the use of baffles or extended dikes
Cross- section details of each . facility including;
embankments (between 3 and 25 ft in height)
top width 8ft min., 10' for heights 15' to 20', 12' for dams over 20', heights
measured from the outside toe
upstream face slope 2:1 or flatter, labeled
downstream slope 3:1 or flatter, labeled
10yr and 100yr high water elevations labeled with 1 ft freeboard for 100yr storm
with emergency spillway or 2 ft freeboard without emergency spillway
an impervious core
a cutoff trench of minimum 4' wide, 4' deep and 1:1 sloped sides
principle spillway
riser crest 1' below emergency spillway if present
riser crest stays within weir flow control during the 10yr storm
trash racks over all inlets and controls to prevent clogging
trash rack over riser crest is not flat (no DI -7's)
riser size and materials labeled
barrel size, strength, material, inverts and slope labeled
all orifices, weirs or other control devices labeled with dimensions and inverts
control orifices not more than 25% of riser perimeter at any point (does not affect
riser structural integrity, 25% is a target)
riser base size and dimensions labeled
access to riser is provided (riser should be in dam, not free - standing)
emergency spillway dimensioned and labeled
invert labeled
dimensions in control section
dimensions in channel section provided if different than control section
linings labeled and shown where applicable
spillway over native soils, and /or sufficient armoring provided
sediment forebays provided for all retention basins, constructed wetlands, and basin
biofilters at all inlets
sized to 0.25" of runoff per impervious acre (can be included in WQV)
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direct vehicle access provided
biofilters with minimum floor dimensions labeled
does not receive any stream base flows, and;
areas of sheet flow into facilities are protected from erosion by appropriate scour
protection stone or energy dissipation measure
plants are shown and labeled with height or caliper
3 plant species are specified (3 trees if present, 3 shrubs) with sizes
biofilter floor is 2.5% of impervious cover for type I, or 4% of impervious cover
for type II
2.5' depth of sand /soil media
1' -1.5' stone drain in geotech fabric under media, with 6" perforated PVC pipe to
daylight
0.5' ponding depth provided in facility
overflow provided
biofilter area is flat
planting soil media conforms to VSMH p. 3.11 -28
cleanouts are provided at the end of the underdrain pipe, and every 50'
in subdivisions, facilities are in open space where present. In subdivision with no open
space, facilities are out of yards and away from residences. Facilities must not be a
nuisance in design or location. [ 17 -304F]
overland relief is provided for any facility in case of clogging. The failure of any system
will not cause structures or yards to flood [17 -304F]
Retention basins have appropriate water quality volume; 3WQV for type I, 4WQV for
type II.
good base flow, or 10 acres or more drain to the pond
normal pool elevation is labeled on plans
15% of surface area is a depth of 1.5' or less
15% of surface area is a depth of 1.5' to 2'
70% of surface area is a depth of 2' to 6' (greater depths are counted in WQV)
a 10' -15' vegetated strip /safety bench is provided around the perimeter
for Type III, a 10 -15' wide and 1 -1.5' deep aquatic bench is provided
typical 10'x10' planting area specified for aquatic bench
at least 3 species of aquatic plant used
extended detention basin II (enhanced) has marsh zones
normal pool elevation is labeled on plans
20% pool areas 1.5' -4' deep
40% shallow marsh 0.5' -1.5' deep, contains 1WQV
40% high marsh 0.5' deep or less
as -built data is provided for existing ponds and drainage structures and facilities
existing ponds and drainage structures and facilities are brought up to current standards
(the rest of this list)
vehicle access roads provided to all facilities
access graded to 10' width and less than 20% grade
minimum 10' wide permanent easement over access
gravel surface or better for grades over 10%
underground facilities have adequate manhole access at upstream and downstream points.
manufactured pre- fabricated water quality facilities have a written approval of the plan
from the manufacturer.
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minimum pipe sizes into and out of the facility are 15" diameter for maintenance
Stormwater management computations: (Applicable to any plan with regulated by the Water
Protection Ordinance)
water quality removal rate computation summary for each facility
detention computation summary for each facility
channel computations for erosion and capacity for emergency spillway channels
drawdown computations for any extended detention facilities
riser floatation computations for risers which are not concrete, or are taller than 10'
routing model and results for each detention facility
hydrology for each facility used to generate inflow hydrographs including;
hydrologic land use coefficients (CN, C), areas and flow times
for the modified rational method, the critical durations used for the peak basin
volume events for 2yr, 10yr and 100yr storms
as closely as possible, the drainage areas represent the site development, and not
off -site areas
computations are provided for composite coefficients
reasonable C values are used (0.25 for woodlands, 0.3 for pasture or pre -dev
grass, 0.35 for dev. yards, 0.75 for gravel)
times of concentration are representative of watersheds. If the omission of small
sheet flow areas yields a higher peak flow, the small sheet flow areas are not used.
Sheet flow should not exceed 200'.
times of concentration generally decrease with development
areas over 50 acres make use of more than one hydrologic method to verify
computation of peak flows
contour areas and elevations used for storage, matching the plans
a stage- storage (elevation vs. storage volume ) table with water quality volume
requirements computed for facilities with volume requirements
the hydraulic dimensions and coefficients for each weir, orifice, culvert or other control
structure used in the routing model, matching plans
flow control is maintained by the riser when present, not the outlet barrel pipe
detention storage and routings are over and above water quality volumes
Mitigation Plan (per the Water Protection Ordinance)
existing conditions as shown on existing conditions sheets (can be to a smaller scale)
proposed conditions as shown on the site or subdivision plan sheet
outlined and /or shaded areas of buffer disturbance, with acreages labeled, matching the
disturbances shown on the erosion control plan.
outlined and /or shaded areas of mitigation, with acreage labeled
for re- plantings, mitigation area is equal to disturbed area
for channel restoration, 1' of restored channel for every 100sf of disturbed buffer.
stations at every 50' min. with existing and proposed cross - sections provided for
restoration
planting plan for mitigation areas per Riparian Buffers Guidance Manual by CBLAD or the
latest policy available from the County's Natural Resources Manager
detail provided for typical spacing (i.e. 20'x20' detail with placement).
native plants used with species, size, root condition specified
maintenance narrative and schedule on plan, including a completion date.
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areas restored or replanted for mitigation must be protected in easements or by
maintenance agreements.
all concentrated discharges treated or extended to adequate channels to preserve buffers.
Erosion and Sediment Control Plan: (per the Water Protection Ordinance)
[Items taken from Water Protection Ordinace, Article I, and the Virginia Erosion and Sediment
Control handbook, minimum standards and specifications]
Narrative:
narrative and project title
project description
existing site conditions description
adjacent areas description
off -site areas description including any off -site areas for borrow, waste or other
disturbance.
special use permit for cut greater than 50,000cy in RA zoning
soils descriptions
County erosion control notes
stormwater runoff considerations: this can refer to the stormwater management plan
sediment basin design computations summary for each sediment basin
sediment trap design computation summary for each sediment trap
Erosion and sediment control plan:
limits of clearing and grading encompassing all disturbances, entrances, staging and
parking areas, areas where sediment laden runoff will cross, or any construction related
activities. This must match any landscaping and conservation plans
a construction entrance (CE) draining to a sediment trap or basin
dust control symbols (DC)
temporary and permanent seeding symbols (TS, PS)
existing contours and topography
existing drainage divides
existing vegetation, with trees to be saved located by drip lines. This must match any
landscaping and conservation plans
protection provided for all stages of construction
no erosion control measures in the way of construction access or grading (Diversion
dikes or silt fence are not placed in the middle of the site, or through access or grading.
Sediment traps are not under or on top of fill. Construction entrances are not on fill, etc.
If the concept for site protection is not adequate in this regard, further review of the plan
may not be possible)
existing soil boundaries are shown with labels. Areas already disturbed are indicated,
with constructed fill depth or cut noted.
critical erosion areas are identified; areas of constructed slopes, areas near property lines
adjacent off -site disturbances are shown with erosion control facilities
a stockpile location
a staging and parking area, or other construction related areas
diversion dikes are used to direct drainage to traps and basins
silt fence is not used across contours in place of diversion dikes.
silt fence is limited to areas of sheet flow with I/ acre per 100ft of level on -grade silt
fence
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temporary slope drains (TSD) or diversions are provided to prevent discharge over
disturbed or fill slopes
inlet protection (IP) on all inlets
culvert inlet protection (CIP) on all culvert inlets
outlet protection (OP) on all outlets
all watercourses are protected and encroachments minimized
stream crossing (USC,SC) and diversions are provided at all stream crossings.
final contours are shown per the site or subdivision plan sheets
WPO stream buffers shown and protected undisturbed. Disturbances require WPO
Program Authority approval and a mitigation plan.
Zoning Ordinance buffers shown and protected undisturbed. Disturbances require
Planning Commission approval of a waiver.
Floodplain shown and protected undisturbed. Disturbances require a Special Use Permit.
final contour shapes and slopes ensure no undrained pockets or stagnant pools
adequate channels (MS -19) provided for each outfall
all swales and low points at the perimeter of the site have a sediment trap or basin (If the
concept for site protection is not adequate in this regard, further review of the plan may
not be possible)
all traps and basins are shown with proposed contours
For each trap;
drainage area is 3 acres or less
sized for total drainage area, including those for in -line upstream facilities
wet storage is 67cy or more
dry storage is 67cy or more
wet storage is 4' deep or less
wet storage side slope is 1:1 or flatter
dry storage side slope is 2:1 or flatter
stone weir is 6ft per acre of drainage area
embankment and stone weir height is 5' maximum from outside toe
embankment top width is adequate (see table 16 reference)
2:1 length:width ratio for flow path
For each basin;
sized for total drainage area, including those for in -line upstream facilities
wet storage is 67cy or more
dry storage is 67yr or more
wet storage side slope is 1:1 or flatter
dry storage side slope is 2:1 or flatter
embankment 15' high or less from downstream toe
principle and emergency spillways sized per handbook requirements
embankment has 1' freeboard during 25yr storm with emergency spillway
embankment has 2' freeboard during 25yr storm without emergency spillway
trash rack / anti -vortex device specified per handbook requirements
riser anchor size specified per floatation computation
dewatering device sized for 6 +hr drawdown of dry storage: 3 "dia. minimum
safety fence and signs stating "danger, quick sand, do not enter" provided if near any
residential properties, or public access
structures and embankment match permanent design for facilities to be converted to
permanent stormwater management facilities
r
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embankment top width is adequate (see reference details)
2:1 length:width ratio for flow path. If necessary, baffles specified only on temporary
structures
Details:
a paved construction entrance detail (see reference details) for projects in the
development areas over 10 acres
a typical section for each temporary channel or diversion, referenced from the plan
sheets. Existing ground should be shown at the maximum cross -slope on the plan.
details and copies of Program Authority permissions for any variances.
Misc:
mass grading (also called rough or early grading plans which contain only approximate
finished grades and culverts necessary to grade.) can only be permitted within planned
developments where a concept grading plan was approved with the rezoning. The agent
(Director of Planning) needs to formally determine that the grading plan is in general
conformity with the approved rezoning plan. Otherwise, all final plans need to be
approved prior to issuance of grading permits.