HomeMy WebLinkAboutWPO201600033 Review Comments WPO VSMP 2016-11-18Phone (434) 296-5832
OF Alga.
VtRGSry�P
COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902-4596
VSMP Permit plan review
Fax (434) 972-4126
Project title: U. of Va. Foundation Golf Facility
Project file number: WP0201600033
Plan preparer: Dewberry Engineers [dkeeler@dewberry.com]
Owner or rep.: University of Virginia Real Estate Foundation [cds7c@virginia.edu]
Plan received date:
(Rev. 1)
(Rev. 2)
Date of comments:
(Rev. 1)
(Rev. 2)
Reviewer:
4 May 2016
10 October 2016
17 May 2016
18 November 2016
David James (ext. 3273)
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 ESOP, (3) a SWMP, and (4) any TMDL measures necessary.
1. Item appears adequately addressed for approval. (Rev. 1)
B. Pollution Prevention Plan (PPP)
The PPP content requirements can be found in County Code section 17-404.
L Item appears adequately addressed for approval. (Rev. 1)
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 submit a VRRM spread sheet for redevelopment. SWM requirements will be
verified/reviewed for approval once all documentation has been received. (Rev. 1)
DewBerry Response: VRRM spread sheet for redevelopment shall be updated to the year 2013
(version 3.0) and shown on sheet C6.03. An excel file shall be provided to Mr. Greene via email.
(Rev. 2) Addressed.
2. SWM plan was not apparent in submittal. Please clarify. (Rev. 1)
DewBerry Response: SWM plan (Sheets C6.01-C6.09) shall be included in this submission.
Previously submitted stormwater report calculation package.
(Rev. 2) Addressed.
3. SWM Plan — Show contributing drainage areas to each SMF; Provide maintenance requirements
for all SWM facilities on drawings. (Rev. 2)
4. C6.03 — Provide a concise narrative describing the stormwater management strategy, BMP used
and level design, describing how the practice fits into the overall plan, and stating all assumptions
made in the design. (Rev. 2)
5. Permeable Pavement (SWM plan) — Provide manufacturer cut sheets and maintenance
requirements. Show location of observation well(s). (Rev. 2)
6. Permeable Pavement (design) — Show that any contributing DA will not exceed twice the SA of
the permeable pavement; Pavement slope to be 0% (1% with an underdrain). (Ref. Section 5).
Verify that the pavement will drain within 48 hours following a storm. Provide the results of soil
infiltration rate testing to confirm a subsoil infiltration rate of at least 0.5-inch/hour for level 2
design. (VADEQ SW Design Spec. 7). (Rev. 2)
7. Confirm the depth to seasonal high groundwater table and bedrock (minimum 2 ft. below the design
bottom of the facility). (Rev. 2)
8. Bioretention basins (SWM plan) — Provide scaled plan & cross sections of BMPs. Show facility
area, embankment area, area of site getting treated for water quality calculations. Show the top -of -
bank and basin bottom elevations. Show the location of underdrain & cleanouts. In the details
(C5.02): Provide 12" (MIN) stone sump below the invert of pipe underdrain; Show max design
storm elevations (2-yr/10-yr); Indicate 5:1 (MAX) slope of grass filter strip to BMP. (Rev. 2)
9. Bioretention (design) - Indicate the type and level design used; Slope of CDA to be between 1-5%;
A pre-treatment cell is needed for any piped inlets; Provide the results of soil infiltration rate
testing to confirm a minimum subsoil infiltration rate of > 0.5 in/hr (> 1 in/hr in order to avoid the
use of an underdrain). The number of infiltration tests is based on the scale of the planned
infiltration facility area (Ref. Tables 9.2 and 9.3). Planting plan: Ponding depths greater than 6"
will require a specific planting plan. [NOTE: The maximum contributing drainage area for a micro-
bioretention facility (e.g., rain garden) is 0.5 acre (3% of the CDA or 5% of the roof area for Level 1 or 4%
of the CDA or 6% of the roof area for Level 2); for an urban bioretention facility is 2,500 sq. ft., and for a
conventional bioretention facility is 2.5 acres.] (VADEQ SW Design Spec. 9). (Rev. 2)
10. Provide calcs for pipe outlet from bioretention. Show that site meets Part II(B) requirements for
channel and flood protection by meeting the design 1-yr 24-hr storm using Energy Balance, or 2-
yr/10-yr 24-hr storms & Limits of Analysis (VSMP Regulation 9VAC25-870-66). (Rev. 2)
11. Provide maintenance access easement to SWM facilities. Access easement may be required (Ref.
Design Manual, Sect. 5). (Rev. 2)
12. Provide the condition of existing storm infrastructure, and if any measures are needed for repair.
(Rev. 2)
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. There does not seem to be a connection between the phase 1 and phase 2 erosion and sediment
control protection plans. Example: Sheet C2.06 shows a basin and diversion across the middle of
the page and no proposed grading, sheet C3.16 shows proposed grades and two bio-retention
structures and no diversions. Basins and traps are required for all phases of construction. This
office recommends combining the two phases into one comprehensive erosion and sediment
control plan. Conversions from sediment traps and basins can /should be on the SWM plans.
Conversions are performed after the site is stabilized and SWM structures are protected from
sediments. (Rev. 1)
DewBerry Response: Sheets shall be updated and SWM Sheets added.
Recommend a simplified plan layout with smaller scale, but not required. (Rev. 2)
2. Sediment traps and basins are required for land disturbances >1 acre per VESCH. (Rev. 1)
DewBerry Response: Sediment traps and basins shall be in design to comply with VESCH
standards.
Addressed. (Rev. 2)
3. Silt fence will need to be moved/shown outside the proposed disturbance. (Rev. 1)
DewBerry Response: Silt fence shall be moved outside of limits of disturbance.
Addressed. (Rev. 2)
4. Diversions should be shown in place of silt fence that runs down slope. The diversions will need a
sediment trap or basin at the outlet. (Rev. 1)
DewBerry Response: Diversions shall be shown in place of silt fence that runs down slopes.
Design shall be updated to show diversions to sediment basin.
Partially addressed — diversion on north part of site is shown going outside limits of disturbance,
include diversion within LOD. Also, remove diversions from cut/fill areas unless these can be
protected during earthwork activities (VESCH 3.09). (Rev. 2)
5. Match lines do not appear to work on all pages. Plans could not be pieced together per match lines
for review. Please revise. (Rev.1)
DewBerry Response: Refer to key plan on sheet C0.05 for match line reference.
Addressed. (Rev. 2)
6. E&SC plan - Indicate staging area, any stockpiles, and show dust control symbols (DC); Show
callouts for proposed SWM features (permeable pavements, stormwater pipes, ditches, MHs, etc.).
(Rev. 2)
7. Show existing drainage divides; Show pre -/post -drainage area, including offsite areas draining to
sediment basin. (Rev. 2)
8. Temp. Sediment Basin - Show design calcs for proposed basin that meet the design criteria;
Missing details for some of the SB components; Mention details on how riser will tie-in to existing
24" pipe; Install baffle to prevent shortcutting; Side slopes should be maximum 2'/2 :1 (VESCH
3.14). (Rev. 2)
9. E&SC Phase II sheets - Show 24" pipe; Show construction entrance. (Rev. 2)
10. C5.01 - A paved wash rack is required; include detail (Ref. Design Manual, Sect. 6). (Rev. 2)
11. C5.01 - Show detail for Nyoplast IP, remove IP detail of curb gutter; Consider capping Nyoplast
inlets until site is stabilized; The (title) heading should match the pictures for check dam (VESCH
3.20). (Rev. 2)
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?departinent--cdengmTo