HomeMy WebLinkAboutWPO201800030 Review Comments WPO VSMP 2018-08-03COUNTY 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: WP0201800030
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
Plan received date
(Revision 1):
24 July 2018
Date of comments:
01 June 2018
Date of comments
(Revision 1):
03 August 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 ESOP, (3) a SWMP, and (4) any TMDL measures necessary.
Please add WP0201800030 to the cover sheet of the SWPPP, plans, and stormwater management
calculations package.
Revision 1 Response: WPO# has been added to Plans, SWPPP, and calculations.
Revision 1 Comment: Comment addressed.
2. SWPPP Section 1 — Please provide a registration statement that is completed to include the
certification. Please delete instructions for completing the registration statement.
Revision 1 Response: Registration statement has been sent to the owner for signature. We
acknowledged that a signed registration statement is needed for the SWPPP prior to plan
approval.
Revision 1 Comment: Acknowledged.
3. SWPPP Section 2 — Please provide a copy of the DEQ coverage letter when obtained.
Revision 1 Response: DEQ coverage letter will be added when obtained.
Revision 1 Comment: Acknowledged.
4. SWPPP Section 7 — Impaired water status cannot be verified as registration statement is not
completed.
Revision 1 Response: Acknowledged.
Revision 1 Comment: Comment not addressed. The discharge is to DEQ identified impaired
Engineering Review Comments
Page 2 of 6
waters. Please include the verbiage contained in 9VAC25-880-70(B)(4)(b) and (c) and
(13)(4)(d)(1) and (2).
5. SWPPP Section 8 — Please provide the information requested.
Revision 1 Response: Qualified personnel shall be provided once a contractor has been selected.
Revision 1 Comment: Acknowledged.
6. SWPPP Section 9 — Please complete and sign the certification.
Revision 1 Response: Certification has been sent to the owner for signature. We acknowledged
that a signed certification is needed for the SWPPP prior to plan approval.
Revision 1 Comment: Acknowledged.
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.
Revision 1 Response: This information will be provided once a contractor has been selected.
Revision 1 Comment: Acknowledged.
Please note that additional comments may be generated based on responses to these comments.
Revision 1 Response: Acknowledged.
Revision 1 Comment: Acknowledged.
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.
Revision 1 Response: Acknowledged.
Revision 1 Comment: PPP approved.
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 correspondence.
Revision 1 Response: This information has been added to the cover sheet.
Revision 1 Comment: Comment addressed.
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).
Revision 1 Response: Albemarle County design standards manual calls for stormwater
calculations to be presented in a tabular format. We feel that the calculations as presented
provide the pertinent information for the pipe/inlet design.
Revision 1 Comment: Comment not addressed. The Albemarle County VSMP/ESC Program
Authority Administrator requires submission of inlet computations on VDOT Form LD204 and
storm drain pipe on VDOT Form LD209 or a similar form that includes all the information
presented on the sited VDOT forms to include the required storm event(s) (inlets throats
4"/hour and 10-year check storm and pipe system at the 10-year storm).
Engineering Review Comments
Page 3 of 6
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.
Revision 1 Response: Roof drainage drains to structure "A". See Sheets C6.2 and C5.1.
Revision 1 Comment: Comment addressed.
4. It appears that structures "C" and "217" 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).
Revision 1 Response: Stormceptor sizing information as well as details have been added to
Sheet C5.1.
Revision 1 Comment: Comment addressed.
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)
Revision 1 Response: Detention facilities have been numbered to match the calculations. See
Sheet C4.2.
Revision 1 Comment: Comment addressed.
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.
Revision 1 Response: This information has been added to the calculations book.
Revision 1 Comment: Comment addressed as based on item 2 of the storm sewer computation
notes on sheet C5.1 and the response to Comment 10 below states that the entire site is within
hydrologic soil group B.
7. Please provide stage discharge curves and routings of 1 and 10-year storm events for New Det 01 and
New Det 02.
Revision 1 Response: This information has been added to the calculations book.
Revision 1 Comment: Comment does not appear to be addressed. The requested information
was not observed in calculation package. Please provide requested information.
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.
Revision 1 Response: This information has been provided with this submission.
Revision 1 Comment: Comment addressed.
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.
Revision 1 Response: Water is conveyed to the existing detention facility via the onsite storm
system. This area is primarily asphalt and has a low time of concentration therefore the
minimum allowable Tc was used.
Revision 1 Comment: Comment addressed.
10. Please correct the VRRM site summary as per sheet No. C5.3 denotes a portion of the site is in
Engineering Review Comments
Page 4 of 6
hydrologic soil group B Glenelg and a portion is within hydrologic soil group C Elioak.
Revision 1 Response: The plan sheet shown on C5.3 is from an older plan and is provided for
reference only. Current soils information is shown on Sheet C6.1, which shows that the entire
site is within soil group B.
Revision 1 Comment: Comment not addressed. No soils information is shown on sheet C6.1 as
stated. Please turn on the soils layer to include soils boundary and soils designation and add to
the legend.
11. Please note that additional comments may be generated based on responses to these comments.
Revision 1 Response: Acknowledged.
Revision 1 Comment: 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.
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.
Revision 1 Response: Critical slopes have been added to Sheets C6.0 and C6.1.
Revision 1 Comment: Comment addressed.
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.
Revision 1 Response: A spot has been shown in the requested area. See Sheet C3.1.
Revision 1 Comment: As based on the elevations given, the height of the retaining wall north of
the terminus of the northern most new parking area exceeds 6 feet and is within the managed
steep slope overlay district. Either reduce the wall height to under 6 feet of provide a double
tiered wall system.
Please address pedestrian access as it is noted that Phase 1 and Phase 2 CE will conflict with sidewalk
to remain.
Revision 1 Response: A portion of the sidewalk where the CE is shown is to be removed as a
part of this project. A note has been added to Sheet C6.2 stating that the contractor is
responsible for maintenance of traffic (including pedestrian) during construction.
Revision 1 Comment: Comment addressed.
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.
Revision 1 Response: This information has been added to the plans. See Sheets C6.0 and C6.1.
Revision 1 Comment: Comment addressed.
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.
Revision 1 Response: The DD shall remain in place, and be adjusted by the contractor during
earthwork operations.
Revision 1 Comment: Please note that the Albemarle County VSMP/ESC Authority
Administrator does not permit the placement of erosion and sediment control measures in the
Engineering Review Comments
Page 5 of 6
way of grading during construction (see attached Engineering E&SC Plan checklist. Item
circled on sheet 3 of 4). Please provide E&SC controls for this area that do not conflict with
grading operations.
6. Please add soil boundary to the Phase 2 E&SC plan sheet.
Revision 1 Response: Soil boundaries have been added to the plans. See Sheet C6.1.
Revision 1 Comment: See Part C Revision 1 Comment 10. Please provide the requested
information.
7. Please provide a stockpile and contractor's staging/laydown and parking areas to the E&SC plan
sheet.
Revision 1 Response: This information has been added to the plans. See Sheet C6.0.
Revision 1 Comment: Comment addressed.
8. Please verify that cut or fill balances do not exceed a 10,000 cubic yard deficit. If deficit is exceeded,
an approved waste area will need to be identified.
Revision 1 Response: Cut/fill balances for the project are less than 300 cubic yards.
Revision 1 Comment: Comment addressed.
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.
Revision 1 Response: SSF locations have been revised. See Sheets C6.0 and C6.1.
Revision 1 Comment: Comment not addressed. Please adjust super silt fence as requested.
10. It appears that slopes steeper 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.
Revision 1 Response: This information has been added to Sheet C6.1.
Revision 1 Comment: Comment not addressed. The criterion is for slopes steeper than 3:1.
Then Consultant has referenced 2:1 slopes. Please correct plan to address comments.
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.
Revision 1 Response: This information has been added to Sheet C6.0.
Revision 1 Comment: Comment addressed.
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.
Revision 1 Response: A temporary level spreader has been added at the end of the CWD. See
Sheet C6.0.
Revision 1 Comment: Comment addressed.
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.
Revision 1 Response: Calculation has been revised to include 0.30 acres.
Engineering Review Comments
Page 6 of 6
Revision 1 Comment: Comment addressed.
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.
Please coordinate Nutrient Credit Purchase with the County's Management Analyst prior to purchase.
Evidence of purchase of required level of nutrient credits is required prior to Applicant receiving a
grading permit.
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 nutrient purchase, ideally) 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;
httD://www.albemarle.orii/deDtforms.asi)?dei)artment=cdenL-vmo
File: WP0201800030 Charlottesville Albemarle SPCA 08-03-18.doc