HomeMy WebLinkAboutWPO201400014 Review Comments WPO VSMP 2015-01-28Michelle Roberge
From: Michelle Roberge
Sent: Wednesday, January 28, 2015 8:52 AM
To: ' WESCHENFELDER @DELTAAIRPORT.COM'
Cc: Ellie Ray
Subject: RE: E4_vsmp_review_Surface Expansion_wpo201400014
Hello Bill,
Please consider this email as the official approval notice for WP0201400014. Please read the process below on how to
obtain a VSMP and grading permit.
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.or. /g_deptforms.asp ?department= cdengno
- Michelle Roberge
From: Michelle Roberge
Sent: Wednesday, January 21, 2015 4:19 PM
To: ' WESCHENFELDER @DELTAAIRPORT.COM'
Subject: E4_vsmp_review_Surface Expansion_wpo201400014
Hello Bill,
The review has been completed. Once the 2 comments are addressed, I will approve. Submit 4 copies of the plan for
approval or you are more than welcome to take these 4 plans at the County and reinsert pages.
« File: E4_vsmp_review_Surface Expansion_wpo201400014.pdf >>
- Michelle Roberge
Michelle Roberge
Department of Community Development
County of Albemarle, Virginia
401 McIntire Road I Charlottesville, VA 22902
434.296.5832 ext. 3458
�pF A
vt�r�1Q
COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902 -4596
Phone (434) 296 -5832 Fax (434) 972 -4126
Project title:
Project file number:
Plan preparer:
Owner or rep.:
Plan received date:
Date of comments:
Reviewers:
VSMP Permit plan review
Surface Parking Expansion
WP0201400014
Delta Airport Consultants, Inc.
Charlottesville - Albemarle Airport Authority
6 Oct 2014
12 Nov 2014
Michelle Roberge
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 ESCP, (3) a SWMP, and (4) any TMDL measures necessary.
1) Include the registration statement in the SWPP booklet.
For future submissions, please use the Albemarle County SWPP template. It can be found in the
following link: http:/ /www.albemarle.org /dgtforms.asp ?department =cden w o
B. Pollution Prevention Plan (PPP)
The PPP content requirements can be found in County Code section 17 -404.
1) Include an 11 "x 17" Pollution Prevention Plan map showing concrete washout, porta johns,
fueling stations, and trash containers. This will be marked up by the contractor as construction of
site progresses.
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) The LOD area is 5.9 acres on the title page. Please include a note that 1.5 acres is resurfacing. This
is to clarify the 4.4 acres on the registration statement and that the 1 -5 acres application fee
applies.
Engineering Review Comments
Page 2 of 4
2) In VRRM spreadsheet, use 43" for annual rainfall. This is the accepted value for central VA.
3) Increase the surface area for the forebay per the new standards in Virginia DEQ Stormwater
Design Specification No 9. It should be 15% of treatment volume. Recompute the treatment
volume for the project site limits only. The VRRM you submitted also applies for the whole site
and adjusts the CN when looking at channel protection. Also, I recommend using a portion of the
biofilter as the forebay. You have sized the biofilter larger than the required treatment surface area.
This will work better for the forbay instead of the 5' tall gabion basket shown at the slope. See a
quick description shown below. Please show for both biofilters.
4) Provide outlet protection at the end of structure E202 and structure E405. The riprap should
extend to toe of slope with gravel diaphragm level spreader to prevent scouring. Show detail with
filter fabric lining at base. See figure 9.8, Virginia DEQ Stormwater Design Specification No 9.
See image in comment #3.
5) Per new biofilter standards, please meet the level 2 requirements. The soil media is now 36" and
stone depth below the underdrain is 12 ". See the standards.
6) Please move the spillway on southern biofilter to western portion of biofilter.
7) Biofilter should be drawn to scale and show the spillway to the toe of slope. Also, label the crest
elevation on stone weir for both biofilters. Remove the 2% cross slopes on embankment.
8) Revise the Tc for D400 -E405 in stormsewer calcs. On paved parking Tc of 15 minutes is too high.
I recommend 5 -6 minutes.
9) Please revise the performance curve DI -7 to reflect changes from comment 13.
10) You have shown a detail of SWM structure on sheet 9. Please show a detail of entire cross - section
to show riser and grate also. Remove the filter fabric inside riser structure.
11) Please include details of both risers in existing extended detention ponds to be modified.
12) Prove the energy balance method to meet channel protection.
Engineering Review Comments
Page 3 of 4
D. Erosion and Sediment Control Plan (ESOP)
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) Remove the geotextile fabric in inlet 400 shown in detail sheet. This is prone to more clogging. I
recommend showing gravel wrapped in wire mesh around base of inlet. Use #3 or #57 stone.
2) It appears the sediment trap does not meet the 134 cy for water quality. Please provide more
surface area. Design it according to contours shown on plan and show detail with required
capacity.
The VSMP permit application and all plans may be resubmitted for approval when all comments have
been satisfactorily addressed. For re- submittals please provide 4 copies of the complete permit package
with a completed application form. All revisions to calculations shall be resubmitted, signed, sealed and
dated.
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.
Engineering Review Comments
Page 4 of 4
County forms can be found on the county website forms center under engineering;
http: / /www.albemarle.or. /g_deptforms.asp ?department= cdengno
File: E1 vsmp_ review projectname.doc
�pF A
vt�r�1Q
COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902 -4596
Phone (434) 296 -5832 Fax (434) 972 -4126
Project: Surface Parking Expansion - WPO
Plan preparer: Delta Airport Consultants, Inc. [804- 275 -8301]
Owner or rep.: Charlottesville - Albemarle Airport Authority
Plan received date: 7 May 2014
Date of comments: 18 Jun 2014
Reviewer: Michelle Roberge
Engineering has completed the review of application WP0201400014.
A. Erosion & Sediment Control Plan and SWM Plan (WP0201400014)
1) [Comment] It appears the erosion control plan and SWM plan sheets are missing. The title
page noted in asterisks, "sheets not included in this submission." Please provide those sheets
for review.
[Revision 11 Comment addressed.
2) [Comment] Basin # 8 does not meet current quality standards. Converting a portion of basin
#8 will further reduce treatment of existing site. It will be best if this biofilter is moved so it
does not further reduce the existing basin's treatment capability.
[Revision 11 Comment addressed. The new biofilters meets the treatment requirements
for the delineated drainage areas. The existing extended detention basins also meet the
treatment requirements.
3) [Comment] Provide and delineate on plan the drainage area to proposed biofilters. Also,
clarify the total impervious area draining to new biofilters.
[Revision 11 Comment addressed.
4) [Comment] The title page should include E &S and SWM Plan in the title.
[Revision 11 This is partially addressed. This should be clearly stated in the title as it will
be shown on the SWM agreement form. Also, remove SDP - 2014 -00019 from the title of
this WPO plan.
5) [Comment] Show as- builts for both basins and outlet structures on plan. Provide a cross
section of the existing pond and outlet structures as well.
[Revision 11 Comment addressed.
6) [Comment] Also, provide existing contours and proposed contours on plan. It is missing on
sheet 8 and 9.
[Revision 11 Comment addressed.
Engineering Review Comments
Page 2 of 3
7) [Comment] Label the type of basin on the plan.
[Revision 11 Comment addressed.
8) [Comment] Label the drainage area, Tc, and CN within the delineated DA on plan for
existing and proposed conditions.
[Revision 11 Comment addressed.
9) [Comment] It appears there is a grate inlet near D400 (on parking lot) that is to be removed
on sheet 8. Please remove or clarify.
[Revision 11 Comment clarified on profile and plan.
10) [Comment] The curb opening to D400 needs to be analyzed. The two other curb opening
needs to be analyzed as well. It appears there is a paved flume to D400. I recommend removal
of paved flume and placing a DIs at those low spots instead.
[Revision 11 Comment addressed.
New Comments:
11) [Comment] provide inlet protection for E -304 on Sheet 10 as a seal coat will be placed on
existing parking lot.
12) [Comment] Provide a variance for the excavated drop inlet sediment trap around E -401.
This inlet protection is designed for up to 1 acres of drainage area. Since the actual
drainage area is larger, please provide a letter for this use to the County Engineer,
Glenn Brooks. Provide calcs that shows required wet volume below grate inlet and dry
volume above grate inlet is equivalent to sediment trap requirements.
13) [Comment] On sheet 11 provide inlet protection for D -400 and D -401 to avoid sediment
into pipes as north biofilter near pond #8 is constructed.
14) [Comment] For the two new biofilters, please address the following:
a) Provide a forebay for pre- treatment from concentrated flow from pipes.
b) Provide cleanouts at ends of underdrain.
c) Provide a cross section of each biofilter to scale.
d) On sheet 19, provide stone weir angle.
15) [Comment] Label LOD acreage on sheet 1.
16) [Comment] Revise the Tc for D400 -E405 in stormsewer calcs. On a paved parking lot a
Tc of 15 minutes is too high. I recommend 5 -6 min. Also revise hydraulic gradeline
computations.
17) [Comment] Please also revise the performance curve DI -7 to reflect changes from
comment 18.
18) [Comment] Sign and seal all calcs submitted.
Engineering Review Comments
Page 3 of 3
19) [Comment] Once all items above are addressed, please sign, seal and date 4 copies of the
WPO plan.
Sincerely,
Michelle Roberge
�pF A
vt�r�1Q
COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902 -4596
Phone (434) 296 -5832 Fax (434) 972 -4126
Project: Surface Parking Expansion - WPO
Plan preparer: Delta Airport Consultants, Inc. [804- 275 -8301]
Owner or rep.: Charlottesville - Albemarle Airport Authority
Plan received date: 25 Feb 2014
Date of comments: 11 Apr 2014
Reviewer: Michelle Roberge
Engineering has completed the review of application WP0201400014.
A. Erosion & Sediment Control Plan and SWM Plan (WP0201400014)
1) It appears the erosion control plan and SWM plan sheets are missing. The title page noted
in asterisks, "sheets not included in this submission." Please provide those sheets for review.
2) Basin # 8 does not meet current quality standards. Converting a portion of basin #8 will
further reduce treatment of existing site. It will be best if this biofilter is moved so it does not
further reduce the existing basin's treatment capability.
3) Provide and delineate on plan the drainage area to proposed biofilters. Also, clarify the
total impervious area draining to new biofilters.
4) The title page should include E &S and SWM Plan in the title.
5) Show as- builts for both basins and outlet structures on plan. Provide a cross section of the
existing pond and outlet structures as well.
6) Also, provide existing contours and proposed contours on plan. It is missing on sheet 8
and 9.
7) Label the type of basin on the plan.
8) Label the drainage area, Tc, and CN within the delineated DA on plan for existing and
proposed conditions.
9) It appears there is a grate inlet near D400 (on parking lot) that is to be removed on sheet 8.
Please remove or clarify.
10) The curb opening to D400 needs to be analyzed. The two other curb opening needs to be
analyzed as well. It appears there is a paved flume to D400. I recommend removal of paved
Engineering Review Comments
Page 2 of 2
flume and placing a DIs at those low spots instead.
Sincerely,
1)1�&�
Michelle Roberge
Now
Awe"
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: Surface Parking Expansion
Project file number: WP0201400014
Plan preparer: Delta Airport Consultants, Inc.
Owner or rep.: Charlottesville-Albemarle Airport Authority
Plan received date: 22 Dec 2014
Date of comments: 21 Jan 2015
Reviewers: Michelle Roberge
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 ESCP,(3)a SWMP, and(4)any TMDL measures necessary.
1) Include the registration statement in the SWPP booklet.
For future submissions,please use the Albemarle County SWPP template. It can be found in the
following link: http://www.albemarle.org/deptforms.asp?department=cdengwpo
Comment addressed. Please note for SWPP on site,include the registration statement,and
general permit coverage letter.
B. Pollution Prevention Plan (PPP)
The PPP content requirements can be found in County Code section 17-404.
1) Include an 11„x 17„Pollution Prevention Plan map showing concrete washout,ports johns,
fueling stations,and trash containers. This will be marked up by the contractor as construction of
site progresses.
Comment 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 5
1) The LOD area is 5.9 acres on the title page. Please include a note that 1.5 acres is resurfacing. This
is to clarify the 4.4 acres on the registration statement and that the 1-5 acres application fee
applies.
Comment addressed.
2) In VRRM spreadsheet,use 43„for annual rainfall. This is the accepted value for central VA.
Comment addressed.
3) Increase the surface area for the forebay per the new standards in Virginia DEQ Stormwater
Design Specification No 9. It should be 15%of treatment volume. Recompute the treatment
volume for the project site limits only. The VRRM you submitted also applies for the whole site
and adjusts the CN when looking at channel protection.Also,I recommend using a portion of the
biofilter as the forebay.You have sized the biofilter larger than the required treatment surface area.
This will work better for the forbay instead of the 5' tall gabion basket shown at the slope. See a
quick description shown below. Please show for both biofilters.
illiti NSF
t {1n= in
( ,,.
Comment addressed.
4) Provide outlet protection at the end of structure E202 and structure E405. The riprap should
extend to toe of slope with gravel diaphragm level spreader to prevent scouring. Show detail with
filter fabric lining at base. See figure 9.8,Virginia DEQ Stormwater Design Specification No 9.
See image in comment#3.
Comment partially addressed.The gravel diaphragm proposed is typically used for sheet
flow. See image below for type of gravel spreader used with concentrated flow.
New
N.r
Engineering Review Comments
Page 3 of 5
•
LIT4 91)
•
y»�..
awl
T
5) Per new biofilter standards,please meet the level 2 requirements. The soil media is now 36„and
stone depth below the underdrain is 12,,. See the standards.
Comment addressed.
6) Please move the spillway on southern biofilter to western portion of biofilter.
Comment addressed.
7) Biofilter should be drawn to scale and show the spillway to the toe of slope.Also, label the crest
elevation on stone weir for both biofilters. Remove the 2%cross slopes on embankment.
Comment addressed.
8) Revise the Tc for D400-E405 in stormsewer calcs. On paved parking Tc of 15 minutes is too high.
I recommend 5-6 minutes.
Comment addressed.
9) Please revise the performance curve DI-7 to reflect changes from comment 13.
Comment addressed.
10) You have shown a detail of SWM structure on sheet 9.Please show a detail of entire cross-section
to show riser and grate also. Remove the filter fabric inside riser structure.
Comment addressed.
Npow
'..r
Engineering Review Comments
Page 4 of 5
11) Please include details of both risers in existing extended detention ponds to be modified.
Comment addressed.
12) Prove the energy balance method to meet channel protection.
Comment addressed.
13) [New Comment] Include stormsewer profile from sheet 25 with this WPO plan.
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) Remove the geotextile fabric in inlet 400 shown in detail sheet. This is prone to more clogging. I
recommend showing gravel wrapped in wire mesh around base of inlet. Use#3 or#57 stone.
Comment addressed.
2) It appears the sediment trap does not meet the 134 cy for water quality. Please provide more
surface area. Design it according to contours shown on plan and show detail with required
capacity.
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 4 copies of the complete permit package
with a completed application form.All revisions to calculations shall be resubmitted, signed, sealed and
dated.
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
Engineering Review Comments
Page 5 of 5
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