HomeMy WebLinkAboutWPO202000044 Review Comments WPO VSMP 2021-03-17�r County of Albemarle
m COMMUNITY DEVELOPMENT DEPARTMENT
VSMP Permit Plan Review
Project: Tenpas Residence - VSMP
Project file#:
Plan preparer:
Owner or rep.:
Plan received date:
(Rev. 1)
(Rev. 2)
Date of comments:
(Rev. 1)
(Rev. 2)
Reviewer:
401 McIntire Road, North Wing
Charlottesville, VA 22902-4579
Telephone:434-296-5832
WWW.ALBEMARLE.ORG
Michael Chandler, Shimp Engineering michaelashimo-engineering.com
Kelsey Schlein kelsev(a,,shimo-engineering.com
Shimp Engineering P.C., 912 E. High Street, Charlottesville, VA 2290
Ronald Jay & Kathryn Dunn Tenpas, 4311 Elm Street
Chevy Chase, MD 20815-6056 [ kathryndunntenoas(a),gmail.com ]
14 Sep 2020
9 Dec 2012
23 Feb 2021
28 Oct 2020
13 Jan 2021
17 Mar 2021
John Anderson
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) (Rev. 2) SWPPP is approved.
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. Submit SWPPP for single-family construction. Please use county template (SF SWPPP). Link to template
will be sent to Michael Chandler and Kelsey Schlein. (Rev. 1) Addressed,
2. Include reference to WPO2020-00044 in single-family SWPPP title. (Rev. 1) Addressed,
3. New: Please revise SWPPP title page Construction Activity to match site location (Albemarle). (Rev. 2)
Addressed.
4. New: With change in state VAR10 CGP reporting requirements, DEQ requires local authorities issue a
generic coverage letter and VAR10 for single-family construction area of land disturbance > 1 Ac. This
project qualifies. Please revise SWPPP to include attached coverage letter and attached (generic) VAR10.
(Rev. 2) Addressed.
B. Pollution Prevention Plan (PPP) — See Sec. A above. Single-family SWPPP with VSMP /WPO plan
will suffice. (Rev. 1) Addressed.
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 single reason listed below: Item 3 /FOS easement.
1. Compare level spreader detail, C7, with details shown with VA DEQ Spec. No. 2, Fig. 2.4B, and ensure
profile and plan ELS details from DEQ specification display clearly on the plan. (Rev. 1) Addressed.
Engineering Review Comments
Page 2 of 4
[image included with initial comments removed with Rev. 1 comments.]
2. C7 /Level spreader -Tvp. detail (Rev. 1) Addressed.
a. Include schematic representation of the ELS structure (concrete or timber).
b. Provide x-sectional dimensions (W x D). Specify length.
c. Also, recommend see VA DEQ Stormwater Design Specification No. 2, Ejg,4., belo . [image
included with initial review removed with Rev. 1 comments.]
d. Include anderdrain in C7 detail to prevent pending /nuisance conditions, ref. Fie 2.3.
e. Daylight ELS underdrain.
(Although C7 detail is descriptive, it lacks clear structural element and underdrain.)
3. Ref. email sent 10/28/2020 11:16 AM (to SE) on topic of storrnwater quality requirements, revise plan
accordingly. Recommend standalone SWM plan sheet. Also, ESC plan review comment item 3.b., below.
(Rev. 1) Not addressed. Please consider (attached) email, and revise design, accordingly, partial /relevant
email text: `0.9 lb. phosphorus reduction is required: either purchase nutrient credits, or on -site SWM; either is
fine. 17-403.13 allows Agreement in lieu ofa SWMplan at Administrator's discretion. It is not automatic. SE in
fact has likely prepared single-family VSMP applications (equivalent scale) with on -site SWM facilities, or
nutrient purchase. This is no different, and unless SE has coordinated this project with the county engineer and
has received advance assurance that a SWM plan was not or would not be requested or expected, then similar to
administration of comparable single-family residences (2.76 Ac. LOD, 0.45 Ac. new impervious area),
stormwater management quality requirements (9VAC25-870-65) apply. 9VAC25-870-65 specifically mandates
application of VRRM.xls. Again, we will send VRMM.xls acceptable to Engineering based on soils maps met.
with Cale. packet.' Also:
a. Revise SWM Narrative, CS to:
i. Reference SWM quality requirements,
ii. Revise text /typo to ref. 9VAC25-870-65 (quantity).
b. Provide VRRM.xls New development runoff reduction spreadsheet.
(Rev. 2) Partially addressed. Applicant response (letter, 2/17/21): `The SWM Quality requirements have been
referenced and addressed. Sheet C5 now includes a revised narrative that states water quality compliance with
9VAC25-870-65 is addressed through dedication of 3.28 acres of open space in D soils.' C5 indicates 3.28 Ac.
open space to be dedicated in the post -developed condition. Calculation packet d. 2/17/21, p. 4, indicates
phosphorus reduction requirement is met with 0.57 Ac. (B soils) and 2.71 Ac. (D soils) placed in open space. As
follow-up please:
• Submit easement plat, with application. Please use `Forest /Open space easement' notation rather than
`Open Space.' A deed of dedication and recordation of forest /open space (FOS) easement is required
prior to WPO plan approval. WPO plan approval is required prior to receiving a Grading Permit.
• In this instance, however, Applicant may request WPO plan approval prior to recordation of easement
plat with written assurance from Applicant to Albemarle that Applicant will make application for forest
/open space easement, and will record deed of dedication with plat in the Albemarle County Circuit
Court, once deed is executed and plat approved. This is a process departure only possible since
proposed forest /open space easement lies entirely within protected WPO buffer, and further, given
county preference to avoid whenever possible undue delay on single family construction. Please Note:
FOS easement is an option, not a mandatory requirement. Nutrient credit purchase is an option. On -
site BMPs are an option. We will try to accommodate whatever Water Quality compliance option is
selected, which appears to be forest /open space easement. FOS easement is an environmental and
practical option since WPO buffer is protected and may not be disturbed even if it is not further
protected by legal instrument of deed with platted forest /open space easement. Please request WPO
plan approval prior to recordation, and provide written assurance of Applicant intent to record a deed
with plat for 3.28 Ac. FOS Easement, if this reflects Owner's process preference.
• Coordinate digital easement plat application with Albemarle /links:
o Easement plat application:
httl)s://www.albemarle.org/home/showl)ublisheddocument?id=1052
o Digital submittal portal: https://Ifweb.albemarle.org/Fortns/CDDSubmission
o Digital payment portal: httos://www.albemarlecountytaxes.org/pavments/default.aspx
Engineering Review Comments
Page 3 of 4
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: Items 4.d.. 5.e./text edits.
1. Revise plan title to include ref. to WP0202000044. (Rev. 1) Addressed.
2. C3 (Rev. 1) Acknowledged.
a. Note: VDOT Land Use permit required for work within public right -of way (driveway entrance).
b. Note: VDOT entrance permit required, please coordinate with VDOT Charlottesville Residency.
3. C4
a. Cross-check sequence of construction phasing (04) with sequences on C5 (ESC Ph-1), C6 (ESC
Ph-2). (Rev. 1) Addressed.
b. Stormwater Management Note: Address stormwater quality requirements (9VAC25-870-65).
Also, see Engineering email sent 10/28/2020 11:16 AM. (Rev. 1) Not addressed. Also, item C.3.,
above. (Rev. 2) Addressed.
4. Check /revise sequence of construction text items 1-6, C5. C6, for accuracy, for example: (Rev. 1)
Addressed.
a. Raritan Lake Road may require revision. (Rev. 1) Addressed.
b. Reference to sediment basin may not apply. (Only sediment trap with this design). (Rev. 1)
Addressed.
c. New: Revise Sequence phase 2, Note 8, to require ESC inspector approval prior to removal of
ESC measures. (Rev. 2) Addressed.
d. New: Revise SWM Narrative to ref. 2-4 4.21 Ac. land disturbance, consistent with plan, and text,
elsewhere. (Rev. 2) Not addressed. Applicant: `The SWM narrative reference to land disturbance
has been revised to 4.21 acres.' As follow-up: Please revise to. 4.21 Ac.
STORMWATER MANAGEMENT:
SWM QUANTITY:
STORMWATER QUANTITY COMPLIES WITH =REA
SHEETFLOW CONDITIONS FROM ALL IMPE
THIS PROJECT WILL DISTURB AN AREAAREAS OF THE SITE MALL BE GRADED
CONDITIONS FROM ALL AREAS OF DISTURBANCE. WHERE RUNOFF
CONCENTRATES AT THE NEW CULVERT (g2) BENEATH THE DRIVEWAY,
A 40-FT LEVEL SPREADER WILL BE INSTALLED TO CONVERT THE
CONCENTRATED FLOW TO SHEET FLOW.
5. C6 (Rev. 1) Partially addressed;follow- u at item. 5.e., below.
a. Label sediment trap (ST) floor dimensions.
b. Remove proposed grading from stream buffer.
(Slight amount of grading appears within 100' stream buffer.)
c. Label ST weir L x W x D dimensions.
d. Label driveway width.
e. Provide culvert 2 profile. (Rev. 1) Partially addressed. As follow-uo: Provide OP at lower end of
pipe. Relabel `inlet protection.' (Rev. 2) As ollow-up: Shift text so culvert #2 label is visible.
f Show /label riprap OP, culvert 1, 2.
g. Show roadside ditch between elevation 610' and culvert 2 on west side of driveway. Runoff from
driveway surface will erode /create a ditch unless controlled ditch section is defined with design.
h. Provide ditch x-section; item g., above.
i. Provide check dams, as needed, for ditch, item g., above.
6. C5C6
a. Provide additional existing contour labels. (Rev. 1) Partially addressed. As ollow-up: Please
revise contour labels to dark black (color) as opposed to faint gray, for readability. (Rev. 2)
Addressed.
b. Revise CE label to read PCE (paved construction entrance). (Rev. 1) Addressed.
c. Revise ELS length based on = (2.93cfs). Ref. VA DEQ Stormwater Design Specification No.
2, Table 2.2, and pg. 14. (Rev. 1) Not addressed. Design does not acknowledge initial explicit
Engineering Review Comments
Page 4 of 4
reference to BMP standard (VA DEQ Stormwater Design Specification No. 2) 10-yr frequency
storm. Please respond to comment, revise ELS length to 3838 ft., minimum. Please call if any
questions. (Rev. 2) Addressed.
VA DEQ STORMWATER DESIGN SPECIFICATION NO.2 SHEET FLOW TO FILTER OR OPEN SPACE
An alternative approach is that utilized by Hemico County, where pipe or channels discharge at
the landward edge of a floodplain or stream (Resource Protection Area or RPA) buffer. The
entire flow is directed through a stilling basin energy dissipater and then a level spreader such
that the entire design storm for the conveyance system (typically a 10-year frequency storm) is
discharged as sheet flow through the buffer. (Refer to Henrico County's Environmental Program
Manual; Chapter 9, Minimum Design Standard 9.01 "Energy Dissipator":
httD://www.co.henrico.va.ustworks/eesd/ .)
d. Show break in silt fence (SF) below ST weir. (Rev. 1) Addressed.
Across sheets (C2, C3, C5, C6): Revise stream buffer linework (at pond) near entrance on Wesley Chapel
Road, since buffer extends SE and downstream to adjacent property line. (Rev. 1) Addressed.
GIS: [ image included with initial review removed with Rev. 1 comment. ]
The VSMP permit application and plan may be resubmitted for approval when all comments have been satisfactorily
addressed. Please provide digital version of revised plan with a completed application form for quicker review.
Process:
After approval, plan 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,
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.
Note (New): With change in state VAR10 CGP reporting requirements, DEQ requires local program authorities to
issue a generic coverage letter and VAR10 for single-family construction with area of land disturbance > 1 Ac. This
project qualifies. Please revise SWPPP to include attached coverage letter, and attached (generic) VAR10. Please
call if any questions.
(This is a local program action that does not involve a state agency directly, nor elevate required (permit) fee/s.)
After bond is posted, the County can hold a pre -construction conference. Applicant 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 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 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;
bUs://www.albemarle.ore(govemment/community-development/ap ply-for/en ing eering-applications
WP0202000044_Tenpas Residence VSMP_031721_rev2