HomeMy WebLinkAboutWPO201800085 Review Comments WPO VSMP 2018-12-13Phone (434) 296-5832
Project title:
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OF Alga.
VIRGSry�P
COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902-4596
VSMP Permit plan review
TMP 18-34F1-G Residence
WP0201800085
Justin Shimp
Mark Lyons
Nov 13, 2018
Dec 13, 2018
David James
Fax (434) 972-4126
b 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.
1. Please complete sections prior to pre -construction meeting. Update reduced plan inserts for
SWPPP when plan is finalized.
B. Pollution Prevention Plan (PPP)
The PPP content requirements can be found in County Code section 17-404.
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.
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.
1. Specify maintenance requirements for the level spreaders & detention basin.
2. Show a `SWM facility' easement around the level spreaders & detention basin.
3. 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.
4. SWM easements to be recorded with a deed & plat prior to VSMP plan approval.
5. 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.
6. Detention design - It looks like the orifice is located between riser and 15" pipe. No stagnant
pools.
7. 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.
8. Show road ditchlines. Provide design calcs.
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.
1. The requirements of 18-4.6.6 Lot Access must be met (general comment).
2. Sheets C3/C4:
a. Show critical slope areas.
b. `Unknown easement' is the WPO buffer of the offsite pond.
c. Cannot find private street easement of 5059/405. Please provide plat.
d. What is the source & date of the 2' contours? When was the property last surveyed?
3. Show location of all existing and proposed utilities and easements with deed book
references.
4. Sheet C8:
a. Also show the culvert profiles. Show that the OP apron is flat.
b. Show that C7 — OP is adequately designed. Doesn't appear to be adequate
for the slope.
5. Sheet C9:
a. Show OP symbols where used.
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.
c. Show diversions going to SH/ST.
d. Show grading (road, etc.), show all existing contours.
6. Show proposed grading.
7. Show ST/detention calcs., the design meets spec, and provide ST detail.
8. Area draining to C4 is over an acre and a culvert inlet sediment trap will be needed
instead (ESC HB, III-48). Provide design & detail.
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=cdengwpo