HomeMy WebLinkAboutSDP201300008 Review Comments Initial Site Plan 2013-03-13Al
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COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902 -4596
Phone (434) 296 -5832 Fax (434) 972 -4126
Project:
Plan preparer:
Owner or rep.:
Plan received date;
Date of comments:
Reviewer:
New Hope Church
Blackwell Engineering
New Hope Community Church
23 Jan 2013
13 March 2013
Max Greene
SDP201300008
[fax 540- 432 -7604]
[fax 434 - 973 -1800]
The Initial Site development Plans (SDP201300008) submitted 05 February 2013 have received
Engineering Review and do not appear to meet Albemarle County's engineering minimum
checklist items for approval. Please adequately address the following comments for final approval:
1) VDOT approval is required for the entrance location. Comments will be forwarded when received.
[DM905, 18- 32.7.2.1.b]
2) Please show existing topography extended at least 50' past the property lines. [18- 32.5.2.d]
3) Please state the date of the topography. All topography should beat least visually field verified by the
designer within the last year [18- 32.6.6, 14 -302, Policy for date]
4) Site appears to have critical slopes that are not delineated on the plan. Please show shading on all
areas on the parcel that exceed 25% slope.
5) This plan appears to be for the construction of phase 1 only. Please remove the phase 2 portion of the
plans from the construction/grading portion of the plan set and show the grading to be completed with
this phase of the project.
6) Please delineate the areas of light verses heavy pavement on the construction plans.
7) Upon "initial" plan approval, please submit Stormwater plans with application and fee for official
review.
8) Upon "initial" plan approval, please submit Erosion and Sediment Control plans with application and
fee for official review.
9) Please see Chapter 17 for Water Protection requirements prior to "final" site plan approval.
Preliminary E &SC comments in advance of WPO application:
a) Plan does not appear to show adequate Erosion and Sediment Control measures to protect adjacent
properties. A Thursday meeting is recommended. See below for meeting request information.
b) Please show the Albemarle County Temporary Paved Construction Entrance detail on the E &SC
plan.
c) Please show areas for the contractors staging, parking, materials storage, and temporary office on
Engineering Review Comments
Page 2 of 3
the construction plan sheet.
d) West side of site appears to require a sediment trap for initial grading until the curbing is installed
to redirect stormwater flows. Silt fence does not meet the State /County requirements for adequate
protection.
e) Sediment trap on the East side of the site is shown in the proposed slope and will need to be
moved to below the slope for adequate protection.
f) Please show proposed elevations on sediment traps for construction and inspection.
g) Culvert inlet protections appears to show 1+ acres draining to CIP and will require a sediment trap
design.
h) Temporary construction entrance is shown as a "one -way" entrance. Please show the other lane to
be blocked during construction or widen the entrance to allow for two -way traffic.
i) All pipes will be a minimum 15" for maintenance.
j) Energy dissipation will be required for paved ditch outlets to prevent scouring.
k) Please show profile of culvert under entrance.
1) Paved ditch shown perpendicular to roadside ditch does not appear to work and may cause
blockage and flooding of the roadway. Please change the angle of confluence and show details for
construction and inspection.
m) Paved ditches may require inlet shaping to direct/capture stormwater flows adequately.
n) Roadside ditches do not appear deep enough for the proposed Check Dams and will cause the
roadway to erode if installed. Please show the roadside ditches a minimum 2' (feet) deep to allow
for the check dam installation.
o) Slope armament may be required for "scupper" inlets to SWM facilities to prevent erosion.
p) Underground detention appears to bypass the water quality structure. Please explain.
q) Underground detention requires at least 0.05% slope to prevent extended pounding in structure.
r) All storm drain inlets will be VDOT approved inlets.
Preliminary SWM comments in advance of WPO application
s) Honor existing drainage divides as much as possible. MS -19 will need to be demonstrated for all
outlets.
t) Computations must use SCS methods. The modified rational hydrograph does not provide enough
runoff volume.
u) Use standard VDOT manholes and a minimum 15" pipe. An 8" orifice setup can be used in the
manhole with an overflow to the 15" pipe
v) A minimum slope of 1/2% is required in the system.
w) Provide pre and post drainage area maps for the facility showing the 3.76 predevelopment acres
and post development area
x) The routings and detention computations must account for areas released undetained, like the
entrance travelway. These areas should be small. Capture as much of the development as possible
for water quality treatment.
y) The bioretention outlet needs to be detailed and should accommodate flow and overflow from the
detention system.
z) Proposed SWM structure appears to be located on rock outcrop. Please provide proof the structure
can be constructed in this location.
aa) Please show SWM for entrance road impervious area.
A Stormwater Management Agreement will be submitted and approved for recordation prior to Final
Site Plan approval. The procedures can be found at this link:
Engineering Review Comments
Page 3 of 3
http:// www .albemarle.org/upload/images/ forms _center /departments /Community Development /forms/
Engineering _and_WPO_Forms/Plan_Review -
_Stormwater Management _BMP_ Facilities _ Maintenance_ Agreement Procedures.pdf
The SWM agreement can be found at this link:
http:// www .albemarle.org/upload/images/ forms _center /departments /Community Development/forms /
Engineering _and_WPO_Forms/Plan_Review -
�Stormwater Management _BMP_ Facilities _ Maintenance_Agreement.pdf
10) Please see Chapter 18- 32.6.2 for Final site plan requirements for approval.
11) Please refer to the Albemarle County Design Standards Manual prior to resubmittal. The link to the
ACDSM is:
hM2: / /www.albemarle.org /upload /images/ forms _center /departments /community development/forms /d
esign_ standards _ manual/Albemarle _ County _ Design _ Standards_ Manual_22Oct2012.pdf
Once these comments have been addressed, please submit 3 copies of the revised plans, calculations, and
narratives to Current Development Engineering along with the required review fee and transmittal form.
Current Development Engineering is available from 2:30 -4 PM on Thursdays to discuss these review
comments. Please contact Max Greene at 434 - 296 -5832 ext. 3283 or email mgreene(&albemarle.org to
schedule an appointment.
[17- 204.f1 An application for an erosion and sediment control plan that requires modifications, terms, or conditions to be
included in order for it to be approved shall be deemed to be withdrawn if the owner fails to submit a revised plan addressing the
omitted modifications, terms or conditions within six (6) months after the owner is informed of the omitted information as
provided under paragraph (B).
File: CDDE1_esc,swm,sdp_MRG_New Hope Church.doc