HomeMy WebLinkAboutWPO201600053 Review Comments WPO VSMP 2016-10-21Short Review Comments Report for:
WPO201600053
SubApplication Type:
Old Trail Village - Ballard Field Upper Subdivision
Stormwater Management/BMP Plan
Date Completed:10/03/2016
Reviewer:Matthew Wentland CDD Engineering
Review Status:Requested Changes
Reviews Comments:
Division:
Date Completed:10/21/2016
Reviewer:Matthew Wentland CDD Engineering
Review Status:Approved
Reviews Comments:existing bond will cover new plan
Division:
Page:1 of 1 County of Albemarle Printed On:September 29, 2017
PHONE(434)977-0205
FAX(434)296-5220
°� INFO@ROUDABUSH.COM
ROUDABUSH, GALE &ASSOCIATES, INC.
A PROFESSIONAL CORPORATION
LAND SURVEYING Serving Virginia Since 1956
ENGINEERING
LAND PUNNING 914 MONTICELLO ROAD
CHARLOTTESVILLE,VIRGINIA
J.LEDBETTER,L.S. 22902
WILLIAM
J.CLINT HARMON,LS.
DAVID M.ROBINSON,P.E. DAVID A.JORDAN,L.S.
AMMY M.GEORGE,L.A. BRIAN D.JAMISON,L.S.
KRISTOPHER C.WINTERS,L.S.
October 3,2016
Mr. Matt Wentland, P.E.Civil Engineer II
County of Albemarle
Department of Community Development
401 McIntire Road,
Charlottesville, VA 22902
Regarding: WPO-2016-00053 Ballard Field Upper Subdivision
Dear Mr. Wentland,
I have reviewed the comments from October 3, 2016. The individual responses to those comments are below.
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. Provide North arrows on the plan sheets.
• North arrows have been provided as requested.
2. Provide Outlet Protection on the inflows to the pond and revise the detail on sheet 5 to match the
plans.
• Outlet protection has been revised to match the plan and values from the SWM
package routings as requested.
3. Provide a maintenance schedule for the wet pond,such as in section 9.3 of the DEQ BMP
Specification No. 14.
• A maintenance schedule has been added to the landscape plan as requested.
4. Show the proposed stormwater management easement on the plans.
• Stormwater management easements have been shown on the plans as requested.
If you have any questions or comments,please feel free to contact me.
Sincerely,
r2LA44,07 )
Jeremy L. Fox
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:
Old Trail Village — Ballard Field Upper Subdivision
Project file number:
WP0201600053
Plan preparer:
Roudabush, Gale, & Assoc.
Owner or rep.:
Dave Brockman [DAVE@OLDTRAH-VH-LAGE.COM]
Plan received date:
23 August 2016
Date of comments:
3 October 2016
Reviewers:
Matt Wentland
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.
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. Provide North arrows on the plan sheets.
2. Provide Outlet Protection on the inflows to the pond and revise the detail on sheet 5 to match the
plans.
3. Provide a maintenance schedule for the wet pond, such as in section 9.3 of the DEQ BMP
Specification No. 14.
4. Show the proposed stormwater management easement on the plans.
D. Erosion and Sediment Control Plan (ESOP)
Virginia Code §62.1-44.15:55 requires the VESCP authority to approve or disapprove an ESOP.
This plan is approved, 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 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;
Engineering Review Comments
Page 2 of 2
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;
ht!p://www.albemarle.oriz/deptforms.asp?department=cden,izwpo
File: WP0201600053 OTV - Ballard Field Upper 10-03-16.doc
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Ater.
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: Old Trail Village—Ballard Field Upper Subdivision
Project file number: WPO201600053
Plan preparer: Roudabush,Gale,&Assoc.
Owner or rep.: Dave Brockman [DAVE@OLDTRAILVILLAGE.COM]
Plan received date: 23 August 2016
(Rev. 1) 4 October 2016
Date of comments: 3 October 2016
(Rev. 1) 21 October 2016
Reviewers: Matt Wentland
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. The
rationale is given in the comments below. The VSMP application content requirements can be
found in County Code section 17-401.
C. Stormwater Management Plan(SWMP)
VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a
SWMP. This plan is approved, 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. Provide North arrows on the plan sheets. (Rev. 1)Addressed.
2. Provide Outlet Protection on the inflows to the pond and revise the detail on sheet 5 to match the
plans. (Rev. 1)Addressed.
3. Provide a maintenance schedule for the wet pond, such as in section 9.3 of the DEQ BMP
Specification No. 14. (Rev. 1)Addressed.
4. Show the proposed stormwater management easement on the plans. (Rev. 1)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, and the reasons are provided in the comments below. The erosion control
plan content requirements can be found in County Code section 17-402.
I
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;
Engineering Review Comments
Page 2 of 2
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?department=cdengwpo
,o, FAX(434)296-5220
ROUDABUSH, GALE &ASSOCIATES, INC. INFOeROUDABUSH.C)OM
A PROFESSIONAL CORPORATION
LAND SURVEYING Sowing Virginia Sims-1956
ENGINEERING
LAND PLANNING 914 MONTICEUA ROAD
CHARLOTTESVILLEE,VIRGINIA
WILLIAM J.LEDBETTER.L.S. 22902
WILLIAM J.CUNT HARMON.LS.
DAVID M.ROBINSON.P.E. DAVID A.JORDAN.L.S.
AMMY M.GEORGE.L.A. BRIAN D.JAMISON.LS.
KRISTOPHER C:.WINTERS.L.S.
August 23,2016
Frank Pohl,County Engineer
County of Albemarle
Department of Community Development
401 McIntire Road,
Charlottesville,VA 22902
Regarding: Old Trail Village-Ballard Field Upper Subdivision WPO-200400005(Revised)
Mr.Frank Pohl,
The following response letter corresponds with the comments provided by Glenn Brooks via email to Chris Mulligan(previous
P.E.of RGA)from September 25,2015 regarding the conversion of the existing sediment basin into a retention pond. The plan
prepared by Timmons Group was originally approved as a biofilter,however,other options were looked at for value engineering
purposes.Roudabush,Gale&Associates has prepared a feasible option for a retention pond based on the newest requirements for
a wet pond from the VA DCR 2013 BMP design specifications.We would like to move forward with the retention pond design
and would appreciate any insight you may have.
1. This pond does not have adequate drainage area to sustain a permanent pool without summer
stagnation and nuisance conditions, and there is no known base flow. This must be addressed
adequately or the proposal will be denied, and the approved biofilter can be constructed. A water
balance indicates an average permanent pool of 39.2 inches is needed. The edges of the pond must be
shelved or walled to prevent a mud line, and the pool must be aerated or otherwise prevented from
eutrophication and algae blooms.
• Though the pond does not have any known base flow,the existing sediment basin has been
field verified to retain quite a bit of water throughout the year.The proposed retention pond
has a design depth of 4.75'while only 3.25' is required.
2. An aquatic bench must be provided as a safety feature.
• A 10' aquatic/safety bench has been added as requested.
3. A landscape plan must be provided with shoreline fringe, riparian fringe and floodplain terrace
vegetation.
• A Landscape plan has been added as requested.
4. The water volume requirement for the pond under 2C criteria is approximately 66,000cf,for a 20.5
acre drainage area with 9.1 acres of impervious. Compute 33,000cf proposed at EL 667.1'. You
have the option of designing to 2B criteria,with a treatment volume of approximately 39,300cf.
• Areas have been recalculated and entered into the latest VRRM(2016)spreadsheet.The
required treatment volume is slightly over 32,000 cf.The proposed design provides 34,000
cf of storage.
5. Forebays must be provided for all concentrated inflows.
• A forebay has been added as requested.
6. Provide a copy of the required stormwater management easement.
• Copies will be provided upon approval.
7. Provide a copy of the required stormwater management maintenance agreement.
• Copies will be provided upon approval.
8. Test to verify compaction and materials in the dam,or re-design per VSMH 3.01.
• We have contacted F&R to field test compaction as requested.
9. The proposed 48inch outfall pipe is overkill in this situation, and will actually be an accessible hazard
and eyesore in this residential area. Reduce the dimension of the riser and outfall pipe.
• The outfall pipe has been redesigned and reduced to 24"as requested.
10. The outfall ditch is currently a mow-able swale with standing water and signs of erosion. The
proposed 2: 1 side slope is not easily maintained in this location. Please provide 3 or 4 to 1.
• The slopes have been revised to 3 to 1 as requested.Proposed grades have been re-
designed to avoid floodplain/floodway encroachment.
1 1. The pond does not appear to provide enough storage volume for the 2yr storm.
• The pond has been redesigned to be adequate for all storm events.Please refer to SWM report for
calculations and routings.
12. All control openings must have anti-clogging measures detailed on the plan.
• The redesign of the pond does not contain a control opening.
13. The spillway detail is inadequate. Detail depth of excavation, linings, and depth and extent
of rip-rap to connect to outfall and ditch from the basin. Show on plan view.
• A detail of the spillway has been updated to accurately portray the design.
14. Remove the sediment basin details from the plan. They are no longer applicable.
• The sediment basin details have been removed as requested.
15. Detail a base for the riser on the plan profile. Remove the standard details which are not applicable.
• A profile has been added to the plans to accurately portray riser and other features.
16. The existing basin likely has a build-up of silt which must be cleaned out. Note or detail this on the
plan.
• A note has been added to remove silt from existing sediment basin before construction
begins.
17. Remove the erosion control narrative.
• The erosion control narrative has been removed as requested.
18. Remove computations and drainage maps from the plan and provide them in a separate booklet.
• A SWM report has been submitted as a separate package that contains calculations and routing
information.
19. Seal, sign and date the plan. Please do not turn in plans which have not been sealed, signed and dated.
• All sheet sets have been sealed,dated,and signed.
If you have any questions or comments,please feel free to contact me.
Sincerely,
(21../14.4.vy i .X7
Jeremy L. Fox