HomeMy WebLinkAboutWPO201800020 Approval - County 2018-10-12COUNTY 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: Keswick Hall Additions and Site Improvements
Project file number: WP0201800020
Plan preparer: Timmons Group, Craig Kotarski, P.E. craig.kotarski@timmons.com
Owner or rep.: Historic Hotels of Albemarle, LLC, John Trevenen jrevenen@keswick.com
Plan received date: 27 March 2018
Plan received date
(Revision 1):
30 July 2018
Plan received date
(Revision 2):
03 October 2018
Date of comments:
27 April 2018
Date of comments
(Revision 1):
03 August 2018
Date of comments
(Revision 2):
12 October 2018 — [Approved pending nutrient credit purchase]
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 approved.
A. Stormwater Pollution Prevention Plan (SWPPP) — SWPPP comments addressed.
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. SWPPP Section 1 — Please have the owner execute the Registration Statement Certification (Item
12) and resubmit. Delete instructions for filling out the Registration Statement from the SWPPP
documents.
Revision 1 Response: Instruction pages deleted. Registration Statement Certification will be
executed prior to final approval.
Revision 1 Comment: Acknowledged. Registration Statement Item 9 — the estimated project
start date of August 1, 2018 has passed. Please adjust accordingly.
Revision 2 Response: The estimated start date has been revised accordingly.
Revision 2 Comment: Comment addressed.
2. SWPPP Section 2 — Please provide a copy of the DEQ coverage letter when obtained.
Revision 1 Response: Letter will be provided when obtained.
Revision 1 Comment: Acknowledged.
3. SWPPP Section 7 —Please add the verbiage from subparagraphs (b) and (c) of 9VAC25-880-70
Part I(B)(4).
Revision 1 Response: Additional notes added.
Revision 1 Comment: Comment Addressed.
Engineering Review Comments
Page 2 of 7
4. SWPPP Section 9 — Complete and sign the certification.
Revision 1 Response: Certification will be signed prior to final approval.
Revision 1 Comment: Acknowledged.
Revision 2 Comment: Comment addressed.
5. SWPPP Section 10 — Per 9VAC25-880-70 Part K, provide the person with the authority to sign
inspection reports or to modify the stormwater pollution prevention plan.
Revision 1 Response: Information to be added once Contractor is selected.
Revision 1 Comment: Acknowledged.
Revision 2 Comment: Comment addressed.
B. Pollution Prevention Plan (PPP) — PPP comments addressed.
The PPP content requirements can be found in County Code section 17-404.
SWPPP Section 6 PPP meets Albemarle County Code section 17-404 requirements.
Revision 1 Response: Acknowledged.
Revision 1 Comment: Acknowledged.
C. Stormwater Management Plan (SWMP) — SWMP comments addressed.
VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a
SWMP. This plan is gpproved.
Please provide pre- and post -development hydrographs for Water Quantity Analysis Points 1
through 5 and place on the plans.
Revision 1 Response: The stormwater calculations packet containing hydrographs were
provided to the County with the plans. In the future, an electronic copy of these calculations
will be provided to WW Associates as well.
Revision 1 Comment: Comment addressed.
2. Please provide the pre- and post -development Tc calculation worksheets for Water Quantity
Analysis Points 1 through 5 drainage areas.
Revision 1 Response: See Sheets C6.01 and C6.03 for Tc calculation values.
Revision 1 Comment: Comment not addressed. Requested worksheets not provided to
substantiate pre -developed Tc value. Please note that no Tc path shown on Sheet No. C6.01
or Tc worksheet provided to substantiate a pre -developed Tc of 30 minutes for the 1.03-acre
pre -developed drainage shed as well as for the 0.52-acre post -developed drainage shed and
thus validate the energy balance for Water Quantity Analysis Point 3. Please provide the Tc
worksheets for the pre -developed drainage areas listed on Sheet No. C6.04 for Water
Quantity Analysis Points 1 through 5. Please provide the Tc worksheets for the post -
developed drainage areas listed on Sheet No. C6.04 for Water Quantity Analysis Points 3
and 5 as these areas do not contain pond routed flows.
Revision 2 Response: Additional flow path arrows have been provided. Per direction of
John Anderson, P.E., of Albemarle County Community Development, time of concentration
calculations are not required to be shown on plan sheets. Time of concentration values have
been provided along with lengths of sheet flow, shallow concentrated flow, etc. See Sheets
C6.01 and C6.03.
Revision 2 Comment: Comment addressed.
3. Please provide complete VRRM spreadsheets for Water Quality Analysis.
Revision 1 Response: The stormwater calculations packet containing VRRM spreadsheets were
provided to the County with the plans. In the future, an electronic copy of these calculations
Engineering Review Comments
Page 3 of 7
will be provided to WW Associates as well.
Revision 1 Comment: Comment addressed.
4. Please provide 2-year and 10-year routing worksheets for SWM1 and SWM2. Please route the
100-year storm event for SWM1 and SWM2 and place the routed 100-year post -developed flow
water surface elevation on the SWM1 and SWM2 details on Sheet No. C6.03.
Revision 1 Response: Specified routing worksheets were included in the stormwater calculations
packet. 100-year post -developed flow water surface elevation for Bioretention Facilities added
to Sheet C6.03. SWM 1 and SWM 2 are not required to handle the 100-year storm.
Revision 1 Comment: Comment addressed.
Pretreatment of runoff entering biofilters is required. Please provide.
Revision 1 Response: Gabion basket forebay walls have been provided to pretreat all runoff
entering the proposed biofilters.
Revision 1 Comment: Please provide calculations demonstrating that pretreatment cell
volume is equivalent to 15% of the treatment volume.
Revision 2 Response: Calculations have been provided accordingly. See Sheets C5.07 and
C6.05.
6. Please provide a ratio of shortest flow path to overall length calculation, provide recalculation on
the plan, and geographically show on the plan for each biofilter.
Revision 1 Response: All nyloplast riser structures elevations shall be 0.5 feet above the bottom
of the biofilter. System short-circuiting will not occur.
Revision 1 Comment: Comment addressed.
7. A nutrient credit availability letter is shown on Sheet No. C6.03. Please provide documentation
that the Oak Grove facility is within the HUC contained in SWPPP Registration Statement.
Revision 1 Response: The Oak Grove facility is located within HUC 02080204. Nonpoint
nutrient offset generation certification will be provided for your use and review.
Revision 1 Comment: Comment addressed (letter on Sheet No. C6.05).
Please note that additional comments may be generated based on response to these comments.
Revision 1 Response: Acknowledged.
Revision 1 Comment: Additional comments were generated during review of SDP201800016
dated 6 June 2018. A copy of the 6 June 2018 letter is enclosed. Comment 1 from the
SDP201800016 review was required to be addressed. Responses to the comments were not
included in the design consultants July 27, 2018 comment response letter. Comments 1D(i),
(ii), and (iii) have been properly addressed (see information on Sheet No. C6.09). Comments
la, lb, and lc were not addressed with WP0201800016. These comments are to be
addressed with this plan.
Revision 2 Comment: Comment addressed.
D. Erosion and Sediment Control Plan (ESCP) — ESCP comments addressed.
Virginia Code §62.1-44.15:55 requires the VESCP authority to approve or disapprove an ESCP.
This plan is approved.
Please add WP0201800020 to the cover sheet of the plans and SWPPP.
Revision 1 Response: WPO number added. See Sheet C0.0.
Revision 1 Comment: Comment addressed.
2. The County's Critical Resource Plan indicates critical slopes within the limits of clearing and
Engineering Review Comments
Page 4 of 7
grading/disturbance. Please add the critical slopes within the limits of clearing and
grading/disturbance to the plan and label whether managed or preserved.
Revision 1 Response: Critical slopes added to Existing Conditions plan sheets as well as Grading
plan sheets. Per Albemarle County GIS data, these areas within the property are neither
managed or preserved steep slopes; they are classified as "Critical Slopes". See Sheets C2.01-
C2.05 and C5.00-05.04.
Revision 1 Comment: Comment addressed.
Please add limits of clearing and grading/disturbance to the demolition sheets.
Revision 1 Response: Limits have been added to Demolition Plan. See Sheets C2.06-C2.10.
Revision 1 Comment: Comment addressed.
4. Please provide location of construction entrance (CE) on Phase I and Phase II E&SC plans. It
appears that a CE was intended to be located from SR 731 Keswick Road adjacent to the "Energy
Plant Building" and the "Laundry Building."
Revision 1 Response: Construction entrances have been added. See Sheets C3.01-C3.10.
Revision 1 Comment: Comment addressed.
Please add a note indicating the new retaining walls 3 feet and higher require separate building
permit. If retaining walls are within managed critical slopes, the design must comply with
Albemarle County Code Chapter 18 Section 30.7.5.
Revision 1 Response: Note added. See Note 23 on Sheet C1.00.
Revision 1 Comment: Comment addressed.
6. There are numerous trees along the east and southeast side of the project within the limits of
clearing and grading that are to remain (not be demolished) but not indicated to be protected with
tree protection measures. Please provide tree protection for existing trees to remain. Further, trees
shown as being demolished are to be removed from the Phase I and II Erosion and Sediment
Control Plans.
Revision 1 Response: Additional tree protection has been added and demolished trees have been
removed from E&SC Plans. See Sheets C3.01-C3.10.
Revision 1 Comment: Comment addressed.
7. Sheet No. C3.03 — SSF shown to be constructed across Club Drive approximately 150 feet south
of SR 731 Keswick Road. Is Club Drive intended to be closed? Please advise. If not, remove
SSF from across the road.
Revision 1 Response: SSF across Club Drive has been removed from Sheet C3.03.
Revision 1 Comment: Comment addressed.
8. Sheet No. C3.00 — The E&SC narrative section "Off Site Areas" references that some utility
connections will require offsite connections. These will need to be shown on the plans if ground is
to be disturbed to include erosion and sediment control measures.
Revision 1 Response: Note has been updated. See Sheet C3.00.
Revision 1 Comment: Comment not properly addressed. What does "significantly
impacted" mean? Either ground "offsite" is to be disturbed or not and, if so, must note that
it is subject to separate E&SC plan. Please resolve.
Revision 2 Response: Wording has been revised. No offsite areas will be impacted as part of
this proposed development.
9. Please show stockpile locations on plan.
Revision 1 Response: Stockpile locations have been added. See Sheets C3.01-C3.05.
Engineering Review Comments
Page 5 of 7
Revision 1 Comment: Comment addressed.
10. Please verify that cut or fill balances have a deficit of 10,000 C.Y. or less.
Revision 1 Response: Earthwork balances will not exceed 10,000 C.Y.
Revision 1 Comment: Comment addressed.
11. Please identify on the plan the contractor staging/laydown area and parking area.
Revision 1 Response: Staging/laydown area have been shown on Sheet C3.02. Parking will
occur on paved surfaces, particularly within existing parking bays as construction allows.
Revision 1 Comment: Comment addressed.
12. Silt fence in numerous locations is shown running perpendicular to the contour. Silt fence is to be
installed on contour, not across contour. Please place silt fence tangents parallel to contour or
provide other measures to contain E&S.
Revision 1 Response: Silt fence has been modified to be shown parallel with contours.
Revision 1 Comment: Comment not properly addressed. On Sheet No. C3.02, from the
bend in the rubberized asphalt cart path northward approximately 130 feet, the super silt
fence is still perpendicular to contour. Please place super silt fence in tangents parallel to
the contour or provide other measures to provide perimeter containment.
Revision 2 Response: Silt fence perpendicular to contours has been removed. Additional silt
fence has been added, in parallel tangents, within this area to contain sediment. See E&SC
plan sheets for updates.
Revision 2 Comment: Comment addressed.
13. Sheet No. C3.05 — Silt fence appears to traverse across the existing driveway to existing house/to
proposed laundry building. Please remove silt fence from across existing driveway.
Revision 1 Response: Silt fence removed from driveway. See Sheets C3.05 and C3.10.
Revision 1 Comment: Comment addressed.
14. Sheet No. C3.00 — Silt Fence Break (SFB) measure not found on Phase I and II drawings. Please
delete detail from this sheet. Also note that SFD is not an approved VE&SCH control measure
unless a variance is requested and subsequently approved by the program authority.
Revision 1 Response: SFB detail has been removed. See Sheet C3.00.
Revision 1 Comment: Comment addressed.
15. In accord with VE&SCH Standards and Specifications 3.13 Sediment Traps, the maximum height
of the sediment embankment shall be 5 feet as measured from the base of the store outlet (see
VE&SCH page III-73 Embankment Cross -Section and page III-74 plate 3.13-1). Sediment trap
ST-1 (on Sheet No. C3.02) embankment height exceeds this requirement by approximately 5 feet.
Please provide an erosion and sediment control measure that meets the VE&SCH requirements
for this drainage area. Further, this trap should be labeled as ST-2 per calculations shown on
Sheet No. C3.00.
Revision 1 Response: Sediment Trap #1 has been revised accordingly. See Sheet C3.02.
Revision 1 Comment: Comment addressed.
16. Sheet No C3.03 — a wedge drainage area to the west of the Energy Plant Building and drainage
area east of sediment trap #1 is uncontained and drains directly to Keswick Road. Please provide
erosion and sediment control measures to provide containment for this portion of the site and add
to the respective Phase II plan sheet.
Revision 1 Response: Silt fence added along Keswick Road. See Sheet C3.03.
Revision 1 Comment: Comment addressed.
Engineering Review Comments
Page 6 of 7
17. Please add check dam detail to Sheet No. C3.00.
Revision 1 Response: Detail added. See Sheet C3.00.
Revision 1 Comment: Comment addressed.
18. Sheet No. C3.07 — no erosion and sediment controls shown between the new hotel addition and
Fairway Drive. Please provide appropriate controls for this area.
Revision 1 Response: Silt fence added here. See Sheet C3.07.
Revision 1 Comment: Comment addressed.
19. Sheet No. C3.10/C5.09 — the parking area to the northeast of the new laundry building depicts the
427 closing on itself resulting in ponding of water. No soil type is shown on Sheet No. C3.05.
The area enclosed by the 427 contour is substantial and water will remain/stagnate until it
evaporates/infiltrates. Further, a good portion is within the new paved parking lot in front of the
building. It is recommended that drainage be relieved overland, or by an area drain with outfall.
Revision 1 Response: Soil data updated to include the limits of work on Sheet C3.05. The
proposed laundry facility has been relocated and grades adjusted accordingly.
Revision 1 Comment: Comment addressed.
20. Sheet No C3.09 — The inlet and outlet of the culvert under Club Drive are to be equipped with
inlet protection and outlet protection to include outlet protection calculations for the drainage area
directed to this culvert.
Revision 1 Response: Culvert inlet protection added. See Sheet C3.09.
Revision 1 Comment: Comment addressed.
21. Sheet No. C3.08 — Please provide outlet protection calculations for storm drain structure 100.
Revision 1 Response: Outlet protection has been provided accordingly.
Revision 1 Comment: Comment partially addressed. Please provide outlet protection riprap
class and blanket thickness based on 2 x d50 of riprap specified (see VESC Standard and
Practice 3.19).
Revision 2 Response: Outlet protection riprap class and blanket thickness have been added
to Sheet C3.08.
Revision 2 Comment: Comment addressed.
22. Sheet No. C6.04 — Please provide drainage area to culvert C3/C 1 and provide which drainage
structure will receive the existing hotel roof drainage.
Revision 1 Response: Drainage area information added to Sheet C6.06. Additional stormwater
infrastructure has been provided to collect existing hotel roof drainage.
Revision 1 Comment: Comment addressed (see Sheet No. C6.06).
23. Please demonstrate that the drainage from the new parking lot area does not exceed the existing
capacity of the existing culvert under Keswick Drive located just to the east of Club Drive.
Provide appropriate culvert hydraulic calculations for the VDOT-required storm event for a state
route.
Revision 1 Response: Energy balance and flood protection requirements are being met at
analysis point 4, prior to entering the existing culvert. A note has been provided on Sheet C5.02
calling for Contractor to clean out and maintain proper drainage through existing culvert. See
Sheet C6.04 for stormwater calculations.
Revision 1 Comment: Comment addressed.
24. Please provide closed conduit storm drain pipe and drop inlet/curb drop inlet calculations and
provide culvert calculations for the culvert under the hotel entrance from Club Drive. Provide
Engineering Review Comments
Page 7 of 7
LD204, LD229, and LD269 worksheets (See VDOT Drainage Manual).
Revision 1 Response: Drainage computations for the closed conduit storm drain system can be
found on separate documents titled "Design Calculations & Narrative" submitted separately to
the County for review. A digital copy shall be provided for your use and review.
Revision 1 Comment: Comment addressed.
25. Please add TP tree protection symbol to the legend on E&SC Phase I and Phase II plan sheets.
Revision 1 Response: TP tree protection symbol has been added. See Sheets C3.01-C3.10.
Revision 1 Comment: Comment addressed.
Most recent submittal included 4 VSMP /WPO print plan sets, 2 SWPPP booklets, which, provided print plans and
SWPPP sent to WW Associates are retrieved, is enough for final approval.
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;
httr)://www.albemarle.orL:,/del)tforms.aSD?deDartinent--cdenz"o
File: WP0201800020 Keswick Hall Adds Site Imp 10-12-18 Rev2 Approv-WWA.doc