HomeMy WebLinkAboutWPO201800085 Review Comments WPO VSMP 2019-02-25Phone (434) 296-5832
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COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902-4596
VSMP Permit plan review
TMP 18-34171-G Residence
WP0201800085
Justin Shimp
Mark Lyons
Nov 13, 2018
Jan 18, 2019
Dec 13, 2018 (Rev.1)
Feb 25, 2019 (Rev.2)
David James
Fax (434) 972-4126
U ustin@shimp-engineering. com]
[mlyonsivy@gmail.com]
[dj ames@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. The rationale is given in the
comments below. The application may be resubmitted for approval if all of the items below are satisfactorily
addressed. 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.
Please complete sections prior to pre -construction meeting. Update reduced plan inserts for
SWPPP when plan is finalized.
(Rev.2) Comment still valid.
B. Pollution Prevention Plan (PPP)
The PPP content requirements can be found in County Code section 17-404.
1. (Rev.1) Show any proposed clearing/grading activities, paving operations, landscaping
operations, E&S controls, staging, stockpile, borrow, fueling, waste disposal, vehicle/equipment
washing, concrete washout locations on the PPP.
(Rev.2) Under Section 6, Part B & C - Show locations these pollutant generating activities
on the PPP as noted in the boxes.
C. Stormwater Management Plan (SWMP)
VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP.
This plan is disapproved, and the reasons are provided in the comments below. The Stormwater
management plan content requirements can be found in County Code section 17-403.
(Rev. l)
,K
(Rev.2) Addressed.
2. (Rev. 1) Show a `SWM facility' easement around the level spreaders & detention basin.
(Rev.2) Level spreader easement should extend to include any protected vegetative buffer
where required.
3. (Rev. 1) A conserved open space or vegetated filter strip must be shown downwards from the
level spreader to function as a permanent measure. This `management' area should extend to the
edge of property or floodplain and be labeled as such.
(Rev.2) Design must meet the length requirements to function as a permanent SWM facility,
see #7 below.
4. (Rev. 1) SWM easements to be recorded with a deed & plat prior to VSMP plan approval.
(Rev.2) Comment still valid.
5. (Rev. 1) I don't believe the detention basins proposed meet any ESC/SWM spec. Show design
calcs meet spec. (i.e. for drainage area, vol., shape, wet pool, drawdown, etc.). Basins should
meet the 25-yr design/spec. The riser structure should have a trash rack.
(Rev.2) Design of detention basin should meet spec.,
Drainage area equal to or greater than 3 acres
. eeds a permanent pool to settle out sediment
Design for Principal Spillway (see DEQ SWM HB, MS 3.02)
6. (Rev. 1) Detention design - It looks like the orifice is located between riser and 15" pipe. No
stagnant pools.
(Rev.2) Needs permanent pool; Design for principle spillway.
7. (Rev. 1) The level spreader design should follow the SWM design specs. It appears from county
GIS that there's existing forest buffer, so the equation would be 40' length for every cfs. So, level
spreader (LS) A would be = 1.47*40', LS B = 3.74*40' (exceeds max), and LS C = 1.28*40'. The
minimum length is 13', max 130'. The maximum sheet flow length of either also must be
satisfied (see VADEQ SWM Design Spec.2, Table 2.2). The LS needs to discharge to a well
vegetated area with <10% slope.
(Rev.2) Design should follow SWM guidance shown in design manual,
Length of ELS lip = 13 lin. ft. per each 1 cfs of inflow (min. 13 lin. ft.; max 130 lin. ft.) for
vegetated filter strips or for undisturbed conserved open space with at least 90% veg. cover (per
Section 6.2 of the Design Specification)
Length of ELS lip = 40 lin. ft. per 1 cfs for forested or reforested filter areas
Size ELS for the 10-yr storm
Overland flow from ELS will not concentrate in 150' or will enter protected buffer
(forest/open space/wpo) or vegetated filter strip or enter into defined natural channel
8. '(Pt-, t) t""mtd di(c1b6n 4. 1'4"m ide dcsiaoo
(Rev.2) Currently addressed.
9. (Rev.2) Include this checklist on the plan set.
http•//www.albemarle.org/upload/images/forms center/departments/Community Develop
ment/forms/Engineering and WPO Forms/"TO VSMP Construction Record Drawings
Policy 23May2014.pdf
10. (Rev.2) Show that outfall from SWM basins go to a natural channel or extend outlet
protection to a natural channel.
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, and the reasons are provided in the comments below. The erosion control
plan content requirements can be found in County Code section 17-402.
(Rev.2) Acknowledged.
2. (Rev.1) Sheets C3/C4:
a. Show critical slope areas.
(Rev.2) Not addressed. There are critical slopes (see County GIS overlay).
b
(Rev.2) Addressed.
Cannot find private street easement of 5059/405. Please provide plat.
(Rev.2) Not addressed; not able to find DB/PG. Show a temp. construction easement
for disturbance in adjacent parcel 18-13F2.
�� �1�f 2} x f ..ro - f. „ z F fb.i F
�� lk.�t a�, �lac�� 4Eltk���� ��' . ,�E�. fnl` �ltc' „K c•e�€tfsr� t �: lxs .�� �t�a.:1ie l�>w�E�l��s:� @� ,� .,If € N� E
(Rev.2) Addressed.
(Rev.2) Acknowledged.
4. (Rev.1) Sheet C8:
:i. k1ko Oh €he cid` (-0' f rWfOe,,. €kwl Tlr; (W1 kl;rolt k III&
(Rev.2) Addressed.
}. 4;bo%, i11.ii (._' % OP k ;0'ell l,"O N, Ov'' ign( El. Ime. 10 aplicar to hw 1ti1? qt w'-
.f ',Pr the ,!,op-
(Rev.2) Addressed.
5. (Rev.l) Sheet C9:
*k.11di-S'
(Rev.2) Addressed.
b. Show SR/ST symbol and design computations for the detention. Show a phased
plan — ESC-1 sheet for perimeter controls, ESC-2 sheet for grading & additional
controls based upon your construction sequence.
(Rev.2) There is not enough drainage area going to these detentions to
classify them as a detention basin. 3 acres D.A. (min) for a sediment basin.
(Rev.2) Addressed.
d. Show grading (road, etc.), show all existing contours.
(Rev.2) Sheets C5,C9,C10 — Show existing contours that are missing on the
(( property.
6. i f i) �xhm 1f b t t
(Rev.2) Currently addressed.
7. (Rev.1) Show ST/detention calcs., the design meets spec, and provide ST detail.
(Rev.2) Partially addressed. The det. basin design will need correction to make it
meet spec.
(Rev.2) Addressed.
9. (Rev.2) Cover - Parcel is listed as 18-13F1 for the TMP# according to County GIS.
The VSMP permit application and all plans may be resubmitted for approval when all comments have
been satisfactorily addressed. For re -submittals please provide 2 copies of the complete permit package
with a completed application form.
Engineering plan review staff are available from 2-4 PM on Thursdays, should you require a meeting to
discuss this review.
Process:
After approval, plans will need 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 need to be completed by
the owner and submitted along with cash, certificates or sureties for the amounts specified. The
agreements will need to be approved and signed by the County Attorney and County Engineer. This may
take 2-4 weeks to obtain all the correct signatures and forms.
Stormwater Management Facilities Maintenance agreements will also need to be completed and recorded.
The County's Management Analyst or other staff will prepare the forms and check for ownership and
signature information. The completed forms will need to be submitted along with court recording fees.
After bonding and agreements are complete, county staff will need to 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 need 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 will need to 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;
http://www.albemarle.org/deptforms.asp?department=cden�ywpo