HomeMy WebLinkAboutWPO202100058 Correspondence 2022-06-24BOHLERI
County of Albemarle
Community Development Department
401 McIntire Road, North Wing
Charlottesville, VA 22902-4579
Attn: John Anderson
Dear Mr. Anderson:
9100 Arboretum Parkway, Suite 360
Richmond, VA 23236
804.893.8200
June 24, 2022
Via Federal Express
Re: WPO2021-00058
VSMP Plan 2nd Review Response
RST Residencies
Seminole Trail and Ashwood Blvd
Charlottesville, VA 22911
Albemarle County
V192076
Bohler is pleased to submit on behalf of RST Development, LLC, the revised VSMP Permit Plan
Review 3rd Submission for the RST Residencies. The following is our comment response letter
addressing comments received from County of Albemarle's Community Development
Department dated June 17, 2022. Each comment is addressed and responded to as follows:
Community Development Department / John Anderson:
A. Stormwater Pollution Prevention Plan (SWPPP)
Comment 1: SWPPP: (Rev. 1) May persist. Please email reviewer .PDF of SWPPP (or provide
link) since SWPPP is not listed with 4 documents submitted 18-May 2022.
Qanderson2@albemarle.org)
a. Sec. 6.A. / PPP Exhibit: Indicate initial location of rain gauge and non-
hazardous solid waste disposal (dumpster).
b. Sec. 6.E.: List names individual responsible for PPP, prior to
preconstruction as prerequisite to receiving a Grading Permit. Not required
for WPO plan approval.
c. Sec. 8: List names individual responsible for ESC compliance inspections
prior to preconstruction as prerequisite to receiving a Grading Permit. Not
required for WPO plan approval.
Response 1: The SWPPP has been included in this submittal and emailed to reviewer.
a. Rain gage and dumpster are shown on sheet C-602
b. Alex Mays has been listed in section 6.E.
c. Alex Mays has been listed in section 8.
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BOHLERI
John Anderson
VSMP Permit Plan 2nd Review Response
June 24, 2022
Page 2 of 4
B. Pollution Prevention Plan (PPP) — see SWPPP item 1.a., above (Rev. 1) May persist.
The PPP content requirements can be found in County Code section 17-404.
C. Stormwater Management Plan (SWMP)
VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or
disapprove a SWMP. This plan is disapproved for reasons listed below. The stormwater
management plan content requirements can be found in County Code section 17-403.
Comment 1: Note: Plan proposes 4.23 lb. nutrient credit purchase (24.6% of TP phosphorus
reduction required). Please coordinate purchase with Ana Kilmer at 434.296-5832
-x3246 prior to finalizing Affidavit and bill of sale, as specific project -related
information must display on Affidavit and bill of sale. Purchase is not required for
plan approval but is prerequisite to receiving a Grading Permit. (Rev. 1) Persists.
Applicant response (letter d. May 18, 2022): 'Comment acknowledged.'
Response 1: Comment acknowledged. We will contact Ana Kilmer prior to finalizing
Affidavit and bill of sale.
Comment 4. Coordinate slopes shown by field survey to be less than 25 percent (not steep
therefore eligible for development) with Engineering. Currently -mapped preserved
steep slopes are shown graded, or with improvements. Neither grading nor
improvements are permissible on preserved steep slopes. A Steep Slopes Exhibit
with discrete survey data showing portions of currently -mapped steep slopes
proposed to be graded or otherwise developed are < 25%, is required, prior to
WPO plan approval of proposed grading, or improvements depicted across
preserved steep slopes. Please coordinate with Engineering. (Rev. 1)
Addressed. Submittal includes Slope Percentage Exhibit (by Eric K. Niskanen,
VATS, d. 3/9/22; field survey performed 12/23/20) that indicates specific areas
are eligible for uses permitted in the underlying district since topographic
information that is more accurate indicates slopes <25% exist in these specific
areas. As follow-up, please:
a. Revise exhibit to include text reference SDP202200002, and
WPO202100058.
b. Estimate /report area (ff^2) of preserved steep slopes field -surveyed to
be <25% (eligible for uses permitted in underlying district).
c. Show areas of preserved slopes field -surveyed <25% across plan
sheets (shown on C-605, but not C-610, C-615), including ESC series
and existing conditions sheets. Recommend provide slope legend if
preserved slopes <25% are shaded red.
d. Direct reviewer to existing conditions sheet (sheet #), or restore
existing conditions sheet I inadvertently removed from WPO plan set.
On existing conditions sheet, please indicate /show:
i. Existing access easement/s, public RW (Ashwood, U.S. Rt.
29), utility easements, etc. Provide deed bk.-pg. ref. for
existing easements, public RW, similar to information shown on
FSP, SDP202200002 plan sheets.
ii. Preserved slopes field -surveyed <25% (12/23/20 survey).
iii. Preserved slopes.
iv. Managed slopes.
w .BohlerEngineering.com
John Anderson
BOHLERI VSMP Permit Plan 2nd Review Response
June 24, 2022
Page 3 of 4
V. Existing contour labels.
vi. Parcel information, to be developed, and adjacent parcels:
1. Owner
2. Tax map parcel
3. Deed bk.-pg. ref.
vii. Features proposed to be removed/ demolished.
Response 4: a. Revised Slope Percentage Exhibit is forthcoming.
b. Revised Slope Percentage Exhibit is forthcoming.
c. The slope hatches and legend are now showing on all erosion sheets. A
reference to the Slope Percentage Exhibit has been added to the cover
sheet.
d. The Existing and Demolition Sheets C-200 — C-204 have been added to the
set and contain the information requested.
Comment 5: C-903:
b. Provide VDOT LD-229 for existing storm system elements within Rt. 29
NBL RW, and Ashwood Blvd RW. Evaluate current available capacity of
inlets and pipes against flow anticipated to occur with RST Residencies
development. (Rev. 1) Partially addressed. As follow-up:
i. Although B-30 is located at EP of parallel parking (C-503), and not
a travel lane, 9.58' spread may pose inconvenience /risk.
Engineering recommends slightly longer STM B-30 DI-3C throat
length.
ii. Ex-F1 to Ex-F2 approaches 100%" capacity of Ex. 18" RCP. Any
upset to predicted in-service performance or bypass of proposed
on -site UG SWM facility may yield flows that exceed capacity of
Ex-F1 to Ex-F2. This instance is referred to VDOT since Ex-F2 is
proximate to (or within) Ashwood Blvd. RW. Engineering defers to
VDOT on FSP's (WPO's) effect on existing storm elements within
public RW, whether U.S. Rt. 29 NBL or Ashwood Blvd. RW (Ex.
pipes /inlets). 6/10/22 VDOT response to referral was sent to
Bohler Engineering as email, June 10, 2022 11:31 AM; partial text:
'developer needs to upgrade it or redesign the SWM detention
system so that it uses less of the pipe's capacity.' Please revise
design per 6/10/22 VDOT guidance.
Response 5: C-903
W. The B-30 throat length has been updated to 12' and the spread is now
less than 7'.
Wi. The proposed pipe UG-F to EX-F1 was added to the calculation for more
accuracy and the more accurate flow through both pipes is less than
100%. See sheet C-903.
Comment 7: Please consider / incorporate WPO plan -related Engineering review comments on
SDP202100079, Initial Site plan, d. 11/16/21, with revised WPO plan. (Rev. 1)
May persist. Applicant: 'Comment acknowledged.'
Response 7: Comment acknowledged. All engineering comments have been addressed.
w .BohlerEngineering.com
BOHLERI
John Anderson
VSMP Permit Plan 2nd Review Response
June 24, 2022
Page 4 of 4
D. Erosion and Sediment Control Plan (ESCP)
Comment 5: (Rev. 1) New:
a. Provide detail for "Flexstorm catch it' inlet inserts listed at Phase IB sequence
of construction Note 5.12, sheet C-605, unless overlooked.
Response 5: The flexstorm detail was added to sheet C-617.
Should you have any questions regarding this project or require additional information, please do
not hesitate to contact me at (804) 893-8200.
Sincerely,
Bohler Engineering VA, LLC
Ryan Yauger, P.E.
RY/et
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