HomeMy WebLinkAboutSUB202100116 Review Comments Preliminary Plat 2022-08-05�q off nig 401 McIntire Road, North Wing
Charlottesville, VA 22902-4579
County of Albemarle Telephone: 434-296-5832
COMMUNITY DEVELOPMENT DEPARTMENT WWW.ALBEMARLE.ORG
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Preliminary Plat review
Project title:
Granger Property Preliminary Plat
Project file number:
SUB202100116
Plan preparer:
Scott Collins, PE, Collins Engineering [ scott(a),collins-engineering.com ]
200 Garret Street, Suite K, Charlottesville, VA 22902
Owner or rep.:
Stribling Holdings, LLC
P.O. Box 1467, Charlottesville, VA 22902
Applicant:
Alan Taylor [ al�riverbenddev.com ] Riverbend Development
455 Second Street SE, Suite 201 / Charlottesville, VA 22902
Plan received date:
30 Jun 2021
(Rev. 1)
18 Feb 2022
(Rev. 2)
28 Jun 2022
Date of comments:
5 Aug 2021
(Rev. 1)
25 Mar 2022
(Rev. 2)
22 Jul 2022
(Rev. 2b)
5 Aug 2022
Plan Coordinator:
Kevin McCollum
Reviewer:
John Anderson, PE, CFM
Engineering has reviewed the Granger Property Preliminary Plat. The following comments may appear as road plan
or WPO plan comments and will need to be addressed before the final plat can be approved.
SUB2021-00116 — For Final Plat Approval
1. General
a. WPO plan must be approved and bonded prior to final plat approval. [ 17-302 / 17-401 / 14-
305 / 14-311]
b. Floodplain Development Permit (FDP) Plan is necessary for proposed work in the floodplain.
It must be reviewed and approved before the WPO plan can be approved [ 18-30.3.12 / 14-
308]
' WPO plan and FDP approval are required prior to Final Plat approval. [14-305 / 14-308]
WPO plan must be bonded prior to Final Plat approval. [ 14-417 (construct SWM); 17-414
(or bond ESC/SWM)]
c. Road plan must be approved and built or bonded before final plat approval. [14-311 / 14-435]
d. Road -plan related
i. Sunset Avenue Ext. — Please ensure existing roadway width at subdivision entrance
can accommodate left -turning inbound single -unit (SU) truck design vehicle, as
defined by AASHTO, without SU vehicle crossing CL of primary subdivision access
(Crespi Bluff Drive) and without crossing CL of Sunset Avenue Ext. except at point
of intersection. [ 14-316 / 14-303.E.] 'Appendix B(1), VDOT Road Design Manual,
.88. (Albemarle defers to VDOT review within public RW.)
ii. Ensure primary access to subdivision (Crespi Bluff Drive) conveys 25-year storm
event, without overtopping roadway surface. [ 14-410 / 17-604.C. I.a ]
e. WPO-related
i. Show and label footprint of proposed UG detention (SWM facility) on Lot 55. [14-
302.A.13]
ii. Show and label proposed SWM facility easement on Lot 55. [14-428]
iii. Remove lots from stream buffer. [17-601.C.]
Engineering Review Comments
Page 2 of 2
iv. Culvert alignment beneath Sera Drive is problematic:
1. Alignment shows Moore's Creek streamline striking at or behind upstream
headwall. Moore's Creek must enter drainage structure at this or revised
structure location with very slight (preferably no) angle to avoid long -tern
erosion, embankment failure, and maintenance concerns.
2. Note: 17-604.C.3. limits stream crossings to 60 LF for roads or streets. [
Also, 14-307.]
v. Show and label SWM facility access to proposed 4-line UG detention system
[Albemarle County Design Standards Manual. Sec. 5, p. 12 —Also, 14-302.A.13]
vi. Provide drainage structure design for primary access, Crespi Bluff Drive, consistent
with normal design practice, including downstream receiving drainage structure
capacity equal or greater than upstream drainage structures (i.e., culvert beneath I-
64). I-64 is, in effect, a dam, and it would be unusual to propose primary subdivision
access drainage structure smaller than the structure beneath I-64. [14-302.A.131.
vii. I-64
1. Label existing culvert beneath I-64, label culvert type, and dimensions.
2. Perform hydraulic modeling /routings for ex. drainage structure beneath I-
64 during the 25-year event to ensure primary access to subdivision has
capacity to contend with volume, velocity, tailwater elevation, etc.
discharging from this structure beneath I-64. [14-302.A.13].
viii. Coordinate stream loss requirements with primary subdivision access, Crespi Bluff
Drive, with USACE (Vinny Pero), provide written evidence of coordination with
USACE. [ 17-107]
f Steep slopes
i. Label managed steep slopes since grading is proposed across managed steep slopes.
[14-304]
ii. Label preserved steep slopes, to aid review, to ensure no grading or other
impermissible activity occurs on preserved steep slopes.
g. Provide frequent existing terrain contour labels such that proposed contours, wall, and
proposed grade may be more easily evaluated against existing grade. [14-302.A.12.]
h. Landscape plan for stepped retaining walls is necessary per 18-30.7.5.A.2.
i. Landscape plan that specifies groundcover /permanent stabilization hardier than grass for any
slopes steeper than 3:1. [ACDSM, Sec. 8.A.2.] Native steep slope grass mix is an option.
j. Maintenance easement will be necessary for any walls that cross individual lot /parcel
boundaries, with final subdivision plat. [ Building Inspections policy ]
k. Ensure design conforms with design standards for steep slopes at 18-30.7.5.A./B./C., for
example: at Sera Drive Moore's Creek crossing where there is apparent need for reverse
slope benching with surface water diversion.
1. Provide sealed geotechnical retaining wall design for review /evaluation with WPO or ROAD
plan. Sealed Retaining Wall plans for wall ht. > 4-ft are required by Building Inspections and
Engineering. Sealed Retaining Wall plans are required prior to WPO or ROAD plan
approval. [ACDSM, Sec. 8.B.]
m. With WPO and FDP, ensure replacement bridge over Morey Creek conforms with
requirements at Ch. 18-30.3 especially concerning fill or impact to horizontal limits of
floodplain, or base flood elevation (BFE).
Please feel free to call if any questions: 434.296-5832 -x3069 / thank you
J. Anderson
SUB2021-00116 Granger Property_prelim plat 080522—rev—elc.doc