HomeMy WebLinkAboutWPO201700073 Review Comments WPO VSMP 2018-05-25
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: UVA Boar's Head Inn Lobby Renovation/Parking Relocation
Project file number: WP0201700073
Plan preparer: Dewberry Engineers [dkeeler@dewberry.com]
Owner or rep.: University of Virginia Real Estate Foundation [cschooley@virginia.edu]
Plan received date: Nov 6, 2017
Feb 16, 2018 (digital)
April 11, 2018 (digital)
May 17, 2018
Date of comments: (Rev.1) Dec 7, 2017
(Rev.2) March 20, 2018
(Rev.3) May 15, 2018
(Rev.4) May 25, 2018 /J. Anderson
Reviewer: David James [djames@albemarle.org]
County Code section 17-410 and Virginia Code §62.1-44.15:34 requires the VSMP authority to act on
any 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. (Rev.1) Insert copy of General Permit coverage when obtained.
(Rev.2) Acknowledged; comment still valid.
(Rev.3) Comment still valid.
2. (Rev.2) Provide (2) final copies of the SWPPP. Please have engineer seal, sign & date each.
(Rev.3) Comment still valid.
B. Pollution Prevention Plan (PPP)
The PPP content requirements can be found in County Code section 17-404.
(PPP requirements have been adequately addressed)
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.
Engineering review comments
Page 2 of 7
1. (Rev.1) Cover – Please remove the SDP number in title and add the WPO number.
(Rev.2) Not Addressed.
(Rev.3) Addressed.
2. (Rev.1) Show SWM easements over all permeable pavement, and underground detention system.
(Rev.2) Partially addressed. Just encompass the SWM facilities & any outfall structures.
(Rev.3) Partially addressed. Easement over underground storage incorrect. (Rev. 4) Addressed.
3. (Rev.1) Please label proposed drainage structures & corresponding design related details.
(Rev.2) Partially addressed. Proposed storm MH/Inlet structures are identified on the profiles, but not
on the corresponding sheets in plan view.
(Rev.3) Partially address. Label for Sheet 3.03.
(Rev. 4) Addressed.
Label ST-1, ST-2, etc. for clearification – to match structure names shown in the profiles - DJ
4. (Rev.1) Provide drainage computations with DA map.
(Rev.2) Partially addressed. Clearly show pre-/post-dev. & inlet drainage areas (DA) on C6.02–C6.05.
Sizes have slightly changed since last review. Use a 1:60 scale on the maps.
(Rev.3) Provide TR-55 verification of the peak runoff q for each DA.
(Rev. 4) Addressed –HydroCAD routings, C6.06.
5. (Rev.1) Provide proposed stormwater drainage profiles.
(Rev.2) Addressed.
6. Permeable Pavement (VADEQ SW Design Spec. 7)
a. (Rev.1) Underdrain – Show perforated pipe installed for the full length of the permeable
pavement cell, and non-perforated pipe, as needed, is used to connect with the storm drain
system.
(Rev.2) Please show underdrain description in the legend.
(Rev.3) Addressed. check sheet -DJ
b. (Rev.1) Field-verified infiltration tests required, 1-2 per facility.
(Rev.2) Acknowledged.
c. (Rev.1) Confirm the depth to seasonal high groundwater table and bedrock (minimum 2
ft. below the design bottom of the facility).
(Rev.2) Acknowledged.
d. (Rev.1) Show underdrain at 0.5% min slope.
(Rev.2) Acknowledged.
e. (Rev.1) Use an impermeable liner along the sides closest to the ‘Boars Head Inn’
building.
(Rev.2) Acknowledged.
f. (Rev.1) Located 100’ from any water supply well and 35’ from any septic system.
(Rev.2) Acknowledged.
g. (Rev.1) The owner should be informed of the routine long and short term maintenance
actions.
(Rev.2) Acknowledged.
h. (Rev.1) Plan landscaping to limit the amount of soil, mulch, grass clippings, leaves, nuts
and fruit that may inadvertently clog the paving surface.
(Rev.2) Acknowledged.
i. (Rev.1) Include the construction sequence and installation notes from section 8.2 and 8.3
Construction inspection notes in the plan.
(Rev.2) Addressed.
7. (Rev.1) Please identify each practice and show each CDA on a separate sheet. Looks like there may be
8 individual cells.
(Rev.2) Addressed.
Engineering review comments
Page 3 of 7
8. (Rev.1) Show/provide Rv calcs.
(Rev.2) Addressed.
9. (Rev.1) Provide storm pipe & inlet design calcs.
(Rev.2) Provide throat length for each drop inlet.
(Rev.3) Addressed.
10. (Rev.1) Please show pipe flow direction arrows.
(Rev.2) Addressed.
11. (Rev.1) Sheet C3.02 – Storm pipe shown connecting two inlets, where does stormwater go from
there?
(Rev.2) Provide existing pipe size & invert elev. Show ex. pipe connection on STM 22 to STM 21
profile. If you can only approximate add note that the bottom of the structure shall be shaped
with cement mortar to prevent standing or ponding of water. Provide calculations showing ex.
pipe adequacy, or provide alt. design.
(Rev.3) Addressed.
12. Sheet C3.03
a. (Rev.1) Add a manhole over 12” pipe outfall at connection with stormwater vault.
(Rev.2) Addressed.
b. (Rev.1) Consider relocating DI-3B (TOP=559.92’) a bit further downstream.
(Rev.2) Addressed.
13. Sheet C5.03 – UD Vault details
a. (Rev.1) Add ‘Upstream’ or ‘Downstream’ for the vault detail titles.
(Rev.2) Add to detail title for clarity.
(Rev.3) N/A.
b. (Rev.1) Show the pavement/CG cover/Finished grade.
(Rev.2) Not shown. 1’ of cover over vault is the absolute minimum (VDOT).
(Rev.3) Addressed.
c. (Rev.1) Show that maintenance access will be provided to downstream/outlet side of
weir.
(Rev.2) Addressed.
d. (Rev.1) Section B is shown incorrectly (opposite direction of arrows) downstream.
(Rev.2) Addressed.
e. (Rev.1) The 9” H shown in the 9x36 orifice doesn’t match the model/calcs of 6” H on
sheet C6.06.
(Rev.2) Addressed.
f. (Rev.1) Is the box culvert 2” thick?
(Rev.2) Addressed.
g. (Rev.1) Show the weir height and clearance dimensions.
(Rev.2) Addressed.
14. (Rev.1) Sheet C6.01 – Show in SWM narrative computations that your SWM design meets Part II(B)
requirements. Show that Energy Balance, or channel/flood protection to the limits of analysis is met.
(Rev.2) The site does not meet Energy Balance requirement of runoff going to a natural stormwater
conveyance system. Runoff from site appears to be conveyed to an existing underground pipe
network, and therefore must meet the requirements of the 2-yr/10-yr peak flow (9VAC25-870-66-
B1(a)/9VAC25-870-66-C1) to limits of analysis (9VAC25-870-66-C3).
(Rev.3) You’re showing that the site qualifies to meet requirements for Energy Balance using
the equation on sheet C6.01. This is not the case as the runoff discharges into an existing
drainage structure and not a natural channel. You have to show pre-/post- calcs for each outfall
of DA A & DA B. You have to show 10-yr to the limits of analysis for flood protection.
(Rev. 4) Comment withdrawn /discussed 5/24, 3-4pm. (A. Nelson, J. Anderson)
15. Sheet C6.06
Engineering review comments
Page 4 of 7
a. (Rev.1) Confirm if 12” outfall pipe of UD vault system is the primary outfall in the post
development routing calcs. If not, please include.
(Rev.2) Addressed.
b. (Rev.1) Confirm if 0.97ac is 100% impervious.
(Rev.2) Show (%)pervious & (%)impervious area
(Rev.3) Addressed.
16. (Rev.1) Sheet L3 – Please identify PO, what type of tree?
(Rev.2) Addressed.
17. (Rev.2) Please number/letter the details in the detail’s sheets and provide callouts to them in the
plan view sheets (not required but recommended).
(Rev.3) Addressed.
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 approved.
1. (Rev.1) Please show callouts for proposed structures & E&S controls to a details sheet. Use
leaders/extend arrows/shading for clarity where needed.
(Rev.2) Addressed.
2. (Rev.1) There are managed slopes near the parking lot. Please show the managed slopes on the
existing site conditions sheet(s).
(Rev.2) Addressed.
3. (Rev.1) Provide low maintenance ground cover where grades are steeper than 3:1, see sheet C3.04.
(Rev.2) C3.04/3.06 – Add groundcover to slopes adjacent to parking lot entrances (circled). Low
maintenance groundcover (not grass) needed as final stabilization measure.
(Rev.3) Addressed.
4. Sheet C2.01/C3.05
a. (Rev.1) Provide ‘sediment control logs’ or similar at the entranceways of the existing
parking lots.
(Rev.2) Addressed.
b. (Rev.1) Fix leader should point to the concrete washout.
(Rev.2) Addressed.
5. (Rev.1) Provide concrete washout details. Is hay bale acceptable?
(Rev.2) Use plastic protective liner instead of hay bale. Revise detail on C5.05.
(Rev.3) Addressed.
Engineering review comments
Page 5 of 7
6. (Rev.1) Sheet C3.06 – Provide ‘sediment control log’ along parking lot entranceway.
(Rev.2) Addressed.
7. (Rev.1) Sheet C5.01 – Add CE symbol to ‘Paved wash rack’ detail.
(Rev.2) Addressed.
8. (Rev.2) These are the WPO plans we are not approving other plan sets. Remove and strikeout
the Structural plans – S0.01, S3.01 & Electrical - E1.01.
(Rev.3) Addressed.
9. (Rev.2) C3.04/3.06 -
a. Show proposed grade elevations.
(Rev.3) Addressed.
b. Add TS/PS/MU symbols to area adjacent to entrance.
(Rev.3) Addressed.
10. (Rev.3) Include the gas line shown on sheet C3.06 in your limits of disturbance if it is an
underground line. (Rev. 4) Addressed. Applicant response: “…not part of our development… will
be under separate cover by the City of Charlottesville.”
11. (Rev.3) You’re showing a 8’ construction fencing around your limits of disturbance, show detail.
A variance for this use will be required. This fence does not conform to current E&SC
standards. Please use SF (spec. 3.05) as perimeter control and SAF (spec. 3.01) as access
prevention instead. (Rev. 4) Addressed –Applicant response: “…is the type preferred by the UVA
Foundation. …the proposed wooden construction fencing would actually further secure the site and
would be more effective at limiting access/perimeter control than the E&SC standard Safety Fence.
[Albemarle agrees.]
Dewberry response (Chris G.): Detail on sheet– 5.01 / 5.02
New comments discussed 5/24, with exception of items #7 (request for revisions ) – email 5/25/2018 4:10 PM
1. C.6.02 and C6.01 Qdeveloped (Overall Site) post-developed 1-yr Qpeak should match. DA A Q1-YR Post (C6.02)
=3.07cfs, check /revise if needed to 3.27cfs (3.27cfs + 2.39cfs =5.66cfs =C6.01 value). [ Energy Balance
Computation ]
2. C3.03, C3.04, C, C6.05 – Revise Fig. 5.3 Storm Sewer Piping Design Table:
a. Include point 3 to 2 (STM 3 – STM 2).
b. Revise point 2 to 1 Runoff Q to 5.52cfs, consistent with 10-yr max routed outflow /DA A
Detention System (ref. graph, far right column /bottom row, C6.06).
c. Revise Fig. 5.3 title to include ’10-Year Storm’.
3. C6.01, Stormwater Narrative: Expand Narrative; please discuss:
a. Natural pond as limit of analysis.
b. Capture of additional Ex. impervious acreage outside LOD, DA A, routed to proposed detention
system.
c. Please provide Note stating: ‘HydroCAD 1-year post-developed routing of DA B (which is not
detained) has been submitted via email to Albemarle County /Engineering; and that Q1-YR Post /DA B
=2.39cfs (Ref. C6.02).’
4. C6.02: Revise labels beneath post-developed DA map to indicate Values are post-developed.
5. Please send single plan sheet (C3.05, or C3.06) .PDF showing concrete washout, porta -potty, rain gauge,
on-site fuel storage (if any), solid waste dumpster (if any) as a SWPPP Exhibit: County will insert in
SWPPP booklet, at Dewberry request (SWPPP, Sec. 6; 11” × 17”).
6. Note: On 5/24/18, Dewberry and county discussed Ex. 15” storm pipe from Str. STM 01 to Ex. 2 (C4.01);
this 15” line is downstream of 18” storm line /detention system, and lies beneath a ‘future
building.’ Applicant (UVA Foundation) will likely re-route Ex. 15” line, prior to future construction of a
building at this location.
(Also, Storm Sewer Piping Design table will be revised: 1 to Ex. is shown at 95% capacity, to be revised;
see also item #2.b., above).
7. Not discussed –At Albemarle County request, please:
Engineering review comments
Page 6 of 7
a. Revise VSMP Plan title to include the word ‘Inn.’
b. Include VA DEQ Stormwater Design Specification No. 7 (Spec. #7), Section 9.3 Maintenance
Inspections, in its entirety, on plans. (Link to Spec. 7:
http://vwrrc.vt.edu/swc/documents/2013/DEQ%20BMP%20Spec%20No%207_PERMEABLE%20PAVEME
NT_Final%20Draft_v1-8_03012011.pdf )
c. Include Attached 2-p. (periodic /Annual) inspection checklist on plans. (Link to source:
https://www.harrisonburgva.gov/sites/default/files/CommunityDevelopment/files/Engineering/BMP%20Mai
nt%20%26%20Insp%20Checklists_Final_July2013.pdf )
d. Show permeable pavement underdrain outlet locations –if shown, please alert reviewer to outlet
/daylight location. (Ref. Spec. #7, Sec. 6.8)
e. Include on plans 2-p. third party construction inspection checklist and certification (Permeable
Pavement) located at:
https://www.fairfaxcounty.gov/publicworks/sites/publicworks/files/assets/documents/pdf/publications/spec-
7-permeable-pavement.pdf .
8. Please review /confirm Attached inspection log is acceptable to Applicant (sw_inspection_report_field-
1_0_impaired_insp-freq.docx). If Attached log is acceptable, please direct Albemarle to include in SWPPP
booklet (Note: inspection frequency =Impaired Waters; Morey Creek:
https://iaspub.epa.gov/tmdl_waters10/attains_watershed.control?p_huc=02080204&p_cycle=&p_report_type=T.
9. May want to revise labels to read ‘Approximate Pond Limits’ –not a request for revision.
The VSMP permit application and all plans may be resubmitted for approval [.PDF welcome, as discussed 5/24]
when all comments have been satisfactorily addressed. For re-submittals please contact T&N Printing,
Charlottesville, arrange to print 4 copies of revised plan sheets, and Albemarle will replace revised sheets in the
four (4) plan sets submitted 5/17/18.
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
Engineering review comments
Page 7 of 7
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
Also /process-related, EMAIL sent: 5/25/2018 8:56 AM
“Amy,
Thanks for taking time to speak with me –it was generous and helpful. In anticipation of VSMP plan approval early
next week, it is not too soon to contact Ana Kilmer to initiate a SWM Facility Maintenance Agreement with
Albemarle County –it is essential to begin this process as soon as possible. I will provide Ana WPO#, Project
Name, TMP#, and whether this project is the MS4 Area; I will send email, and copy you.
Ana Kilmer, Management Analyst /CDD –tel: 434.296-5832 –x3246.
Also critical:
A Deed of Dedication is required for proposed SWM Facilities. This requires professional licensed survey of SWM
easements (plat) for SWM Facilities, including proposed detention and permeable pavers. A drainage
(maintenance) easement plat must cover outfall (pipes) to the natural pond behind Boars Head Inn that receives
runoff from both DA A (detained flow), and DA B. As with the SWM Facility Maintenance Agreement, please
initiate steps required for SWM and Drainage Easement plat/s /Deed of Dedication for this project as soon as
possible. The county will furnish the Deed of Dedication (document) with project -specific information completed,
for Applicant’s signature, based upon the executed /Approved SWM Facility Maintenance Agreement, but
Applicant must provide Easement plat/s. Thanks again Amy”
WPO201700073 - UVA Boar's Head Inn Lobby_Rev(3)_052518.docx