HomeMy WebLinkAboutWPO201800056 Review Comments WPO VSMP 2018-08-14Phone (434) 296-5832
OF Alga.
VIRGSry�P
COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902-4596
VSMP Permit plan review
Project title: Wawa
Project file number: WP0201800056
Plan preparer: Jonathan Q Ritchie
Owner or rep.: Mark Fontaine
Plan received date: July 16, 2018
Date of comments: Aug 14, 2018
Reviewer: David James
Fax (434) 972-4126
[j ritchie@bohlereng. com]
[mfontaine@renaudconsulting.net]
[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. Complete items 8 & 12 of the Registration Statement.
2. Insert copy of General Permit coverage when obtained.
3. Provide a PPP exhibit sheet (to be updated in the field).
4. When ready provide (2) copies of updated SWPPP.
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. Cover sheet: Add the WPO number to title: WP0201800056; Remove signature block (not
needed for WPO); Update Sheet Index.
2. Please include the SWM and Storm computations sheets in the plan set; C-403 to C-503
sheets that were on the site plan.
3. Show existing conditions sheet with existing drainage divides.
4. One or more actions may be required (to be determined): Removal of existing stormwater
facility (SWF) on adjacent property may require the adjacent property owner to submit a
VSMP plan amendment. The easement for the SWF may need to be vacated. A boundary
line adjustment plat may need to be submitted/reviewed/approved prior to VSMP approval.
5. Submit a SWM maintenance agreement (see below).
6. Purchase of nutrient credits required before the VSMP plans can be approved. Please
contact Ana Kilmer regarding nutrient credit purchase and required documentation.
7. Show a `SWM facility easement' for the proposed underground detention system. Required
width: 10'+(pipe dia. or channel width) + 2'+ 2(depth-5'). Show drainage easement for
proposed pipes/channels (outside of ROW) which carries water through site from offsite.
{Design Manual, section 6}
8. Submit a Deed of dedication and easement & Plat for the SWM facility (UD system).
9. Provide details on UD system including profile and cross-section showing pipe and manhole
openings, orifice and weir locations and dimensions. Show material, lining, bedding, cover
details & dimensions.
10. Sheet C503: Show the culvert / orifice & weir locations on the profiles. Show height of the
W.S.E. for the design storms.
11. Provide Hydraflow report of the pre/post watershed model schematic, and report of
pre/post hydrograph summary.
12. Can you provide computations on how the Q values were obtained on the pre & post
development plan (sheets C402 & C403)? There appears to be some discrepancy between
the Q values shown on the hydrographs (C404 to C407).
13. Sheet C408 — Show the Energy Balance equation solved for each POI and total site.
14. Use the NOAA Atlas 14 for precipitation/ intensity values for the 1-,2-,10-yr storms (C409) -
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds printpage.html?lat=38.1324&lon=-
78.4344&data=depth&units=english&series=pds
15. Provide MH access to UD pipe at STM B-1 location.
16. Provide maintenance requirements for the UD system on the plans.
17. Provide typical section, lining type requirement & design calcs. for the ditch alongside
Proffit Road.
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. Show existing conditions sheet with existing drainage divides. Show all existing
easements with deed book references, locations & dims.
2. Show area of existing stormwater facility to be removed (tbr).
3. Show off -site disturbances in an easement.
4. Show existing right-of-way lines and EOP labeled.
5. Note: Contractor can't demo pavement, or grade until E&S perimeter controls are
in place (phase 1).
6. Show proposed street name and ROW line. Show portions of sight distance in an
easement if outside of ROW.
7. Proposed slopes greater than 3:1 to have low maintenance (not grass) ground cover
specified on the plans, which will not require mowing. {Design Manual, section 81
8. The county requires a paved construction entrance. Provide this detail on the
details sheet {Design Manual, section 3F}:
STONE 70' MIN.
CONSTRUCTION
ACCESS Y' 5M-2A ASPHALT TUP
COURSE 2$ PAVE12AISTINO
2% M'V`
5MiN. 2�A AGGREGATE SASE
PROFILE
STONE — 70• MIN.
CONSTRUCTION ASPHALT pAVVrp
ACCESS A WASHf20.C%
EC
27 2% PAVEMAVELI ENT
Z% 12' MIN!
•MUST EXTEND FULL WIDTH �`pOSfTiVE DRAINAGE
OF INGR€SS AND EGRESS TO SEDIMENT
pPERATION TRAPPING DEVICE
PLM
�12' MIN. POSITIVE :%I:'•.I -I,
2q Tp sEpla!�,._
// TRAPPING
FILTER CLOTH —
SECTION A —A
A uTitiunun water tap of 1 iwh unlst be installed u�tlr a mutumm� 1 loch ballcock
elnRod'T•ahe suppl}ius a wush hose with a diameter of 1.5 vaches for adeclnate
constant pressTue Was9i water must he carded away firm the enhnnce to an
approved settling — to remove aeduneirt. All sedunent shall be preT tw ,j fivm
enteriuz storm drams. ditclres or watercoines,
PAVED WASH RACK
NO SCA_L
9. Diverting runoff to an existing inlet that is proposed to be raised to final grade will
not be allowed. Runoff must go to a sediment trap or similar.
10. Callout the type of IP needed, i.e. for STM EX-02, and provide a detail (ESC HB,
Spec 3.07).
11. Show dust control symbols (DC) for phase U.
12. Show temporary seeding symbols (TS) where needed.
13. Show existing vegetation to be saved with (TP) symbols. This must match any
landscaping plans.
14. `Gutter buddy' use needs variance approval (let Frank Pohl, County Engineer
know).
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