HomeMy WebLinkAboutSDP201300042 Correspondence 2013-06-28 � 1
BLACKWELL ENGINEERING, PLC
566 E.MARKET ST. • HARRISONBURG,VIRGINIA 22801 • (540)432-9555 • FAX(540)434-7604
June 28, 2013 BE# 2167
Megan Yaniglos, Senior Planner
401 McIntire Road,North Wing
Charlottesville, VA 22902-4596
Subject: SDP-2013-008 New Hope Church—Final Site Plan—First Submittal
Dear Megan,
The following items are in response to your letter dated May 16, 2013.
Erosion and Sediment Control Permit
1. Comment acknowledged.
2. Comment acknowledged.
3. Comment acknowledged.
4. Comment acknowledged.
5. A tree conservation checklist will be included on the Landscape Plan scheduled to be
provided by Albiston Associates.
6. Slopes adjacent to the entrance drive have been increased to 2:1 to reduce tree
disturbance. Appropriate entrance sight lines have been maintained.
7. The width of the entrance drive has been reduced to 20 feet.
Final Site Plan
1. Comment acknowledged.
2. Comment acknowledged.
3. Comment acknowledged.
Planning Division Approval
1. Comment acknowledged.
2. A Conservation Plan Checklist will be included on the Landscape Plan scheduled to
be provided by Albiston Associates.
3. Additional existing tree lines have been added to the plan.
4. Black and white copies of the plan are included in the resubmittal sets.
5. The entire parcel is shown on a separate Sheet 1 of 1 titled Overall Site included in
the resubmittal sets.
6. The conditions of the special use permit are now stated exactly on the Title Sheet.
7. Parcel number and use of the eastern abutting property are shown on Sheet 2.
8. All phase lines and references to phases have been removed.
9. Phases 2 and 3 have been removed.
10. Right of way lines for the existing streets are shown on Sheet 2.
CIVI1.ENGINEERS SPECIALIZING IN l-ANI)DEVELOPMENT,ENVIRONMENTAL NEEDS AND
CONSTRUCTION MANAGEMENT SERVING COMMERCIAL.INDUSTRIAL AND MUNICIPAL.CLIENTS
Megan Yaniglos
June 28, 2013
Page 2
11. Distance from the entrance to the centerline of the nearest existing street is shown on
Sheet 2.
12.
a. Pavement and walkway dimensions are shown on Sheet 2.
b. At this time no site lighting is proposed.
c. Dimensions of the plaza areas are shown on Sheet 2.
d. All paving materials are shown in the details and legend on Sheet 2.
Engineering Division
1. Easements for storm water management and drainage control are shown on Sheet2.
2. No Water Protection Ordinance buffers are being disturbed.
3. Comment acknowledged.
4. Existing topography is shown 50' beyond the property boundaries on Sheet 2 and on
the Overall Site Sheet 1 of 1.
5. Date of topography is now listed in the survey notes on the Title Sheet.
6. All land surfaces with slopes of 4:1 and greater are shown by shading on Sheets 2, 3
and the Overall Site Sheet 1 of 1.
7. All references to phases have been removed.
8. Areas of light and heavy pavement are delineated by shading on Sheet 2.
9. Comment acknowledged.
10. Comment acknowledged.
11. Comment acknowledged.
12. Slopes adjacent to the entrance drive have been increased to a maximum of 2:1.
13. Entrance drive has been reduced to 20' in width.
Preliminary E&SC
a. Additional erosion control measures have been added to Sheet 3.
b. Albemarle County Temporary Paved Construction Entrance is shown on Sheet 3.
c. Area for contractor staging,parking, material storage and temporary office are shown
on Sheet 3.
d. Fill diversion(FD) and diversion dike (DD)have been added to Sheet 3.
e. The eastern sediment trap associated with grading for future phases has been
removed.
f. Elevations on the sediment trap are shown in the inset on Sheet 3.
g. The culvert inlet protection(CIP) for the entrance culvert has been removed and
replaced with inlet protection(IP) at Structures 2 and 3 on Sheet 3. The drainage area
limit for a silt fence CIP is one acre. The drainage area limit for the CIP with
optional stone combination is three acres. The latter is specified at the existing
culvert in Route 606. It is unlikely that VDOT will permit excavation for a sediment
trap in the right of way.
h. A Type III barricade is shown to limit entrance to one lane.
i. All storm water management piping is now a minimum of 15".
‘ftemil ',ore
Megan Yaniglos
June 28, 2013
Page 3
j. Outlet protection has been added to the paved flume outlet on Sheet 3.
k. The culvert at the entrance has been replaced with underground detention and is
shown on Sheets 2, 3 and 5.
1. The paved flume has been realigned on Sheet 3.
m. The paved flume has been realigned on Sheet 3.
n. Roadside ditches are adequate to convey the proposed flows. A modified check dam
(CD) detail is shown on Sheet 3 and the spacing between them has been reduced.
o. The scupper draining the parking lot has been replaced with a curb inlet.
p. The bioretention basin receives the flow from the underground detention#1 as shown
in Virginia Stormwater Management Handbook, Figure 3.11-4. Flow is diverted to
the basin by the 18x6 stainless steel or aluminum angle installed in the ditch and
detailed on Sheet 3.
q. Underground detention piping now has minimum slopes of 0.5%.
r. All storm drain inlets are now shown with VDOT standard.
s. Stormwater hydrographs 1 and 10 (pre-development flows) and hydrographs 7 and 14
(post-development flows) demonstrate compliance with MS-19 in the Narrative.
t. The storm water management computations now use the SCS method instead of the
Modified Rational method previously proposed. However, we believe this method is
inappropriate for small drainage areas and results in excessively large detention
volumes. Section 6.4.5 of the VDOT Drainage Manual states, "Application-
Hydrographs produced by the Modified Rational Method can be used for the analysis
and design of stormwater management(SWM) basins, temporary sediment basins, or
other applications needing a hydrograph for a drainage area of less than 200 acres."
Figure 6-1 of the manual shows the SCS method (TR-55)best suited for drainage
areas of 200 to 2,000 acres.
u. VDOT standard inlet structures are now specified.
v. A minimum slope of 0.5%is provided in the system.
w. Pre and post development drainage area maps are provided in the Erosion and
Sediment Control Narrative.
x. Underground detention has been added at the entrance that captures previously
undetained runoff.
y. The bioretention basin outlet is detailed on Sheet 3.
z. The rock outcrop will be removed to install the sediment trap and bioretention basin.
aa. Underground detention for the entrance drive is shown on Sheets 2, 3 and 5.
Architectural Review Board
1. Comment acknowledged.
2. Comment acknowledged.
3. Compensation plantings will be shown on the Landscape Plan scheduled to be
provided by Albiston Associates.
4. Tree protection fencing is shown on the upslope side of excavations. Silt fencing is
shown on the down slope side of excavations and will also serve as tree protection
fencing.
•
Megan Yaniglos
June 28, 2013
Page 4
Albemarle County Fire and Rescue
1. Alex Morrison at the Albemarle County Service Authority stated ACSA does not
permit fire hydrant connections to properties outside of their service area.
2. Fire apparatus can turn around at the intersection of the two parking lots.
3. Curb radii at the intersection of the two parking lots has been increased to 25 feet.
4. The requirement for a Knox box to be placed as directed by the Fire Marshal's Office
has been added to the General Notes, #21, on the Title Sheet.
Virginia Department of Transportation
1. Site distance profile is provided on Sheet 5.
2. Entrance profile is provided on Sheet 5.
3. Comment acknowledged.
Thomas Jefferson Health Department
1. Dave Forrer at DEQ was consulted regarding the two known UST cases in the
vicinity of the site, PC1995-4347 and PC1996-4825. Both cases are considered
limited in extent and no detectable levels of total petroleum hydrocarbon (TPH) were
found at the bottom of the excavated soil or in the ground water.
Please call me if you have any questions or require additional information.
Cordially,
. /34.4i4„............7.........._-
Basil Finnegan
Senior Designer
Cc: Michael Henderson—Pastor