HomeMy WebLinkAboutWPO202100058 Review Comments WPO VSMP 2022-06-17County of Albemarle
COMMUNITY DEVELOPMENT DEPARTMENT
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VSMP Permit Plan Review
Project title: VSMP Plan for RST Residencies
Project file number: WPO2021-00058
Plan preparer:
Ryan Yauger, PE [ rvauger&bohlereng.com ]
Bolder Engineering
9100 Arboretum Pkwy, Suite 360
Richmond, VA 23236
Owner or rep.:
Alex(i�rstdevelol ment.com
RST Development, LLC
6110 Executive Blvd., #620
Rockville, MD 20852
Plan received date:
12 Oct 2021
(Rev. 1)
18 May 2022
Date of comments:
24 Nov 2021
(Rev. 1)
17 Jun 2022
Reviewer:
John Anderson
401 McIntire Road, North Wing
Charlottesville, VA 22902-4579
Telephone: 434-296-5832
WWW.ALBEMARLE.ORG
County Code section 17-410 and Virginia Code §62.1-44.15:34 requires the VSMP authority to act on any
VSMP permit by issuing a project approval or denial. This project is denied for reasons listed below. The
VSMP application content requirements can be found in County Code section 17-401.
A. Stormwater Pollution Prevention Plan (SWPPP)
The SWPPP content requirements can be found in County Code section 17-405. A SWPPP must contain
(1) a PPP, (2) an ESCP, (3) a SWMP, and (4) any TMDL measures necessary.
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. ( ianderson2&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 named individual responsible for PPP, prior to preconstruction as prerequisite to
receiving a Grading Permit. Not required for WPO plan approval.
c. Sec. 8: List named individual responsible for ESC compliance inspections prior to preconstruction
as prerequisite to receiving a Grading Permit. Not required for WPO plan approval.
B. Pollution Prevention Plan (PPP) —see SWPPP item l.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.
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.'
Engineering Review Comments
Page 2 of 4
2. Include Construction Record Drawings (As -built) for VSMP on the plans, link to document:
https://www.albemarle.org/home/showl)ublisheddocument/3381/637327510536700000 (Rev. 1)
Addressed.
3. Revise (title sheet) Plan Title to include WPO202100058. (Rev. 1) Addressed.
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, VA.LS, 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 (ft2) 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 if
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.
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.
5. C-903
a. Provide VDOT LD-204, Stormwater Inlet Computations, and LD-229, Storm Sewer Design
Computations for on -site proposed SWM collection /conveyance system. (Rev. 1) Addressed. As
follow-up: please see item 5.b., which immediately follows.
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-F 1 to Ex-172 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-FI to Ex-172. This instance is referred to VDOT since Ex-172
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 Boller 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.
Engineering Review Comments
Page 3 of 4
c. While C-903 considers I-10 (existing /proposed) 2-year inlet capacity, the capacity of the pipe
network dm\ mtrcam of I-10 inlet must be evaluated against additional storm runoff (10-yr event)
reaching I- ment entrance on U.S. Rt. 29 NBL. (Rev. 1) Withdrawn. Engineering
defers to VDOT on FSP design's effect on Ex. (or proposed) storm drain elements within public
RW.
6. C-907
a. Include installation sequence, guidance, notes, labels, etc. for Vault 1, Vault 2. Ensure notes,
sequence, etc. specify that SWM facilities are not to be installed prior to upslope stabilization.
(Rev. 1) Addressed.
b. Include periodic maintenance and inspection procedures, guidance, steps, etc. for Vaults 1, 2.
(Rev. 1) Addressed.
7. Please consider /incorporate WO 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.'
D. Erosion and Sediment Control Plan (ESCP)
Virginia Code §62.1-44.15:55 requires the VESCP authority to approve or disapprove an ESCP. This plan
is disapproved for reasons listed, below (1 new comment, request for non-VESCH measure detail). The
erosion control plan content requirements can be found in County Code section 17-402.
1. C-601
a. ST-2 is proposed immediately adjacent to property line, recommend revise location to provide
additional space for post -event remedy, i.e. measures that may be required to limit erosion or off -
site sediment transport should less frequent events overwhelm capacity of ST-2, an event of
failure. ST location immediately adjacent to property lines is discouraged. (Rev. 1) Addressed.
2. C-618
a. Specify concrete embedment for sediment basin primary riser, provide buoyancy calculations,
unless overlooked. (Rev. 1) Addressed.
3. Provide SAF between existing multi -use (ped /bike) path along U.S. Rt. 29, and development. (Rev. 1)
Addressed.
4. Provide interim phase ESC plan, between ESC phase I and II, that indicates a stage of development and
stabilization with trapping devices (ST/SB) coincident with building, parking, and travelway grading prior
to installation of SWM detention systems. Phase I reflects no grading (existing conditions, i.e., no
development grading), while phase II ESC plan depicts complete development, site stabilization —arc of
site development /interim grading is missing. Provide interim phase ESC plan that reflects proposed mass
grading required to prepare building sites, travelway /parking subgrade, etc. At this stage, traps or basin
may require alteration. Depict ESC measures required to support mass grade /next phase of development,
including road /parking subgrade elevations, building pad elevations, etc., prior to final stabilization. (Rev.
1) Addressed.
5. (Rev. 1) New:
a. Provide detail for' Flexstorm catch it" inlet inserts listed at Phase IB sequence of construction
Note 5.12, sheet C605 unless overlooked.
Process:
After approval, plans will have to be bonded. The bonding process is begun by submitting a bond estimate request
form and fee to the Department of Community Development. One of the plan reviewers will prepare estimates and
check parcel and easement information based on the approved plans. The County's Management Analyst will
prepare bond agreement forms, which will have to be completed by the owner and submitted along with cash,
Engineering Review Comments
Page 4 of 4
certificates or sureties for the amounts specified. The agreements will have to be approved and signed by the County
Attorney and County Engineer. This may take 24 weeks to obtain all the correct signatures and forms.
Stormwater Management Facilities Maintenance agreements will also have to be completed and are recorded. The
County's Management Analyst or other staff will prepare the forms and check for ownership and signature
information. The completed forms will have to be submitted along with court recording fees.
This project requires separate easement plat application, review, and approval. Once plat is reviewed and comments
are addressed, Engineering will format template deeds (SWM / public drainage) to be recorded with the plat
Note: easement plat with deed/s must be recorded prior to receiving a Grading Permit.
Also: plan proposes 4.23 lb. nutrient credit purchase. Although nutrient credit purchase is not required for WPO
plan approval, it is required prior to pre -construction, to receive a Grading Permit.
After bonding and agreements are complete, county staff will enter project information in a DEQ database for state
application processing. DEQ will review the application information based on local VSMP authority approval. At
this time, the DEQ portion of the application fees will have to be paid directly to the state. For fastest processing,
this is done electronically with the emails provided on the application. DEQ should notify applicants with
instructions on how to pay fees. When DEQ approves the application, they will issue a permit coverage letter. This
should be copied to the county.
After DEQ coverage is issued, via the coverage letter, the County can hold a pre -construction conference.
Applicants must complete the request for a pre -construction conference form, and pay the remainder of the
application fee. The form identifies the contractor and responsible land disturber, and the fee remaining to be paid.
This will be checked by county staff, and upon approval, a pre -construction conference will be scheduled with the
County inspector. At the pre -construction conference, should everything proceed satisfactorily, a joint VSMP and
grading permit will be issued by the County so that work may begin.
County forms can be found on the county website forms center under Engineering Applications:
https://www.albemarle.org_/govemment/community-development/aDDly-for/en ing eering-applications
Thank you.
Please call if any questions — tel. 434.296-5832-x3069, or email ianderosn2&albemarle.org.
WP0202100058 RSTResidencies 061722revl