HomeMy WebLinkAboutWPO201800030 Review Comments WPO VSMP 2018-06-01 COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902-4596
Phone (434) 296-5832 Fax (434) 972-4126 VSMP Permit Plan Review
Project title: Charlottesville Albemarle SPCA
Project file number: WPO201800030
Plan preparer: Timmons Group, John Wilson, P.E. john.wilson@timmons.com
Owner or rep.: Charlottesville Albemarle Society for the Prevention of Cruelty to Animals
Plan received date: 30 April 2018
Date of comments: 01 June 2018
Reviewer: WW Associates, Inc.
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 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 add WPO201800030 to the cover sheet of the SWPPP, plans, and stormwater management
calculations package.
2. SWPPP Section 1 – Please provide a registration statement that is completed to include the
certification. Please delete instructions for completing the registration statement.
3. SWPPP Section 2 – Please provide a copy of the DEQ coverage letter when obtained.
4. SWPPP Section 7 – Impaired water status cannot be verified as registration statement is not
completed.
5. SWPPP Section 8 – Please provide the information requested.
6. SWPPP Section 9 – Please complete and sign the certification.
7. SWPPP Section 10 – Per 9VAC25-880-70 Part K, please provide the person with the authority to
sign inspection reports or to modify the stormwater pollution prevention plan.
8. Please note that additional comments may be generated based on responses to these comments.
B. Pollution Prevention Plan (PPP)
The PPP content requirements can be found in County Code section 17-404.
1. SWPPP Section 6 PPP meets Albemarle County Code Section 17-404 requirements.
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. Please provide Owner’s phone number and email address for the Owner to receive
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correspondence.
2. Please provide closed conduit storm drain pipe and drop inlet or curb drop inlet calculations using
VDOT LD229 and LD204 worksheets (see VDOT Drainage Manual and Section 6 Drainage
Systems of the Albemarle County Design Standards Manual).
3. The drainage area divides on the Phase 2 E&SC plan does not address where roof runoff from the
existing building and the northern most and southern most new building additions enters the
closed conduit storm drain system. It appears that roof drainage is directed to existing structure
“A”. Please provide closed conduit storm drain calculations from existing structure “A” to existing
structure “G” and reroute the existing underground detention system.
4. It appears that structures “C” and “2F” are stormceptors and appears to be of the inlet type. It
appears that an OSR model is proposed as based on Figure 3 presented in the design calculation
booklet. Please provide sizing calculations and Stormceptor Model No. to demonstrate that proper
size unit is being provided as based on the flow directed to the unit. Also, provide the proper
inlet/outlet drop per the stormceptor technical data sheet for the selected unit (or denote custom
design).
5. Please provide the numeric identifier on each underground detention facility to match that
indicated in the Model Schematic (Figure 4 of the design calculation booklet) and show on plan
sheet (C4.2) and detail sheet (C5.1)
6. Please provide soil group and soil surface description to facilitate verification of weighted CN for
each subbasin’s input data in the design calculation booklet.
7. Please provide stage discharge curves and routings of 1 and 10-year storm events for New Det 01
and New Det 02.
8. Please provide the name of the DEQ certified facility that is intended to provide nutrient credits.
Provide VAHUC for the project site and for the nutrient credit facility.
9. It appears that the existing underground detention upstream to the existing bioretention facilities is
modeled with a Tc of 5 minutes. Please provide calculations demonstrating a Tc of 5 minutes.
10. Please correct the VRRM site summary as per sheet No. C5.3 denotes a portion of the site is in
hydrologic soil group B Glenelg and a portion is within hydrologic soil group C Elioak.
11. Please note that additional comments may be generated based on responses to these comments.
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 County’s Critical Resources Plan denotes managed critical slopes throughout the parcel.
Please denote the location of the managed slopes with a symbol and add to the legend.
2. Please provide a top of wall spot elevation at the northeast corner of the eastern most new parking
lot to verify that retaining wall height is not greater than six feet as it appears that the retaining
wall is located within a managed critical slope area.
3. Please address pedestrian access as it is noted that Phase 1 and Phase 2 CE will conflict with
sidewalk to remain.
4. Please add dust control symbol to the E&SC plan sheets legend and add locations to the plan.
Provide same information for temporary and permanent seeding as well.
5. A DD is shown in a portion of the area to be filled to construct a new parking lot (eastern most
new parking area). Please explain the DD status during earthwork operations.
6. Please add soil boundary to the Phase 2 E&SC plan sheet.
7. Please provide a stockpile and contractor’s staging/laydown and parking areas to the E&SC plan
sheet.
8. Please verify that cut or fill balances do not exceed a 10,000 cubic yard deficit. If deficit is
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exceeded, an approved waste area will need to be identified.
9. SSF is shown crossing contours at several locations on the Phase 1 and Phase 2 E&SC plan. SSF
is to run parallel with contours. Please place SSF on tangents or provide other perimeter E&SC
measures.
10. It appears that slopes sleeper than 3:1 are proposed on the south side of the eastern most new
parking lot and the north side of the northern most new parking lot. Please provide a symbol for
slopes steeper than 3:1 and add to the legend and to the E&SC plan sheets. These areas are to have
low maintenance (not grass) ground cover specified (what type) on the E&SC plan sheets.
11. Please provide an alpha or numeric indicator for the two excavated drop inlet traps to facilitate
reference. Provide a stage/storage volume table for each trap and identify the wet and dry storage
volumes and elevations, and a calculation verifying a 2:1 length/width ratio for flow path in
consideration of the inflow location.
12. The clean water DD on the west side of the project site is to discharge to a stable/stabilized outfall.
Please provide appropriate drainage area/flow calculations and size riprap apron or other measures
to stabilize outfall.
13. Please add the drainage area (0.30 acres) to the volume calculation for the eastern most drop inlet
sediment trap on Sheet No. C6.0.
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
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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
File: WPO201800030 Charlottesville Albemarle SPCA 05-18-18.doc