HomeMy WebLinkAboutWPO201800026 Review Comments WPO VSMP 2018-07-17 (2)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:
Caliber Collision — VSMP Plan
Project File Number:
WP0201800026
Plan preparer:
Freeland and Kauffinan, Inc. [bhutchinsonAfk-inc.com; tburnett(abtk-inc.com
Owner or rep.:
Ludwig Kuttner, P.O. Box 359, Keene, VA 22946
[lkuttner(a)hampshireinvest.com ]
Plan received date:
5 April 2018
(Rev. 1)
18 Jun 2018 (digital -.PDF)
(Rev. 2)
16 Jul 2018 (digital -.PDF)
(Rev. 2b)
17 Jul 2018 (digital -.PDF /SWPPP)
Date of comments:
23 May 2018
(Rev. 1)
10 Jul 2018
(Rev. 2)
17 Jul 2018
(Rev. 2b)
17 Jul 2018 —Approved pending Nutrient Credit Purchase, Easement Recordation
[SWM, ESC Plans & SWPPP Approved]
Reviewer:
John Anderson
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, but eligible for approval
ep nding receipt of Agreement of Sale for 1.38 lb. nutrient credits, in document format acceptable to county,
and upon receipt of scan of recordation of Deed of Dedication of SWM Facility, Access, and Permanent
Drainage Easement (acquisition of easements, and purchase of Nutrient Credits are in process). The VSMP
application content requirements can be found in County Code section 17-401.
General
1. Provide a stand-alone VSMP plan set, including sheets: (Rev. 1) Addressed.
a. Sheets 1-10; 16-20 only.
b. Sheet 1: Title plan set VSMP Plan /WPO #201800026 for Caliber Collision
c. Sheet 8: for VSMP Plan, re -title this sheet Site Layout.
2. Sheets 2, 4, 5, 8, 16: (Rev. 1) Addressed.
a. Provide additional contour labels;
b. Show /shade preserved steep slopes;
c. Show FEMA floodplain boundary;
d. Approximate existing tree line.
Provide SWPPP (booklet) using county template. (See A., below.) (Rev. 1) Partially Addressed.
Follow-up SWPPP comments, below. (Rev. 2) Partially addressed /please see, below.
Provide /record permanent drainage easement extending from SWM facility easement, to include detention
pond outfall pipes through Str. 9, and continuing from Str. 9 to Moores Creek, prior to VSMP approval.
(Rev. 1) Partially Addressed. Asfollow-up: 15' drainage easement shown; requires surveyed easement
plat (metes /bounds) and Deed of Dedication, once Maintenance Agreement is recorded. (Rev. 2)
Addressed. Applicant response: Easement Plat submittal is being prepared and will include 15' drainage
easement.
Engineering Review Comments
Page 2 of 6
5. Provide SWM facility access and maintenance easement (deed /plat), and record SWM Maintenance
Agreement for dry pond (with access extending to Avon Street Extended), prior to VSMP approval. (Rev.
1) Not Addressed. As follow-up: While 9' wide Access is shown around dry detention pond, cannot
identify SWM facility easement that incorporates pond. Requires surveyed easement plat (metes /bounds)
and Deed of Dedication, once SWM Maintenance Agreement is recorded. Also: Extend Access Easement
from dry pond to Avon Street Ext. See Process (following comments). (Rev. 2) Addressed. Applicant
response: Easement Plat submittal is being prepared and will include SWM Facility Easement (SWM
Facility entirely, and Access from pond gate to Avon St. Ext.).
6. Septic Field design requires VDH approval. Albemarle County does not coordinate VDH approval.
Applicant is urged to coordinate septic design review and approval with VDH as soon as possible. (Rev. 1)
Addressed. Applicant states septic design is under review with VDH.
7. Albemarle County Engineering Division does not review, approve or warranty private landscape irrigation
systems, though the system may be reviewed with building permit application. (Rev. 1) Addressed.
Applicant: Noted.
8. Adopt VDOT nomenclature, for example DI-2A, instead of double combination inlet, if DI-2A intended
(sheet 18). (Rev. 1) Addressed.
9. Title sheetrevise Vicinity Map. (Rev. 1) Addressed.
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. Link to County template:
http://www.albemarle.orgLupload/images/forms_center/departments/Community Development/forms/Engin
eeringtand _WPO_ Forms/Stormwater _Pollution _ Prevention_Plan _SWPPP template.pdf
Sec. 6 (SWPPP template) should include schematic Exhibit showing locations of items listed Sheet 4, 5 Sequence of
Construction (I" paragraph), and Erosion Control Note 14. Exhibit should indicate reasonable locations for: solid
waste receptacle, on -site fuel, porta-potty, concrete washout, etc. Contractor may later revise the Exhibit. For on -
site fuel storage, provide containment sufficient to impound the volume of fuel stored + 10-yr rainfall event. (Rev.
1) Partially Addressed. As follow-up, please:
1. Exhibit: Show location of concrete washout schematically (unless overlooked). (Rev. 2) Partially
addressed. Shown on sheet 4; please show on SWPPP Exhibit, as well. (Rev. 2b) Addressed.
2. Exhibit: Show rain gee. (Rev. 2) Partially addressed. Shown on sheet 4; show on SWPPP Exhibit.
(Rev. 2b) Addressed.
3. Sec. 6.E. —List person responsible; recommend FK personnel. Later, SWPPP authority may be delegated tc
a GC (Sec. 10). (Rev. 2) Addressed.
4. Sec. 8 —same. List qualified personnel; recommend FK personnel. (Rev. 2) Addressed.
5. Sec. 9: Complete signed certification: this should be FK personnel. (Rev. 2) Addressed.
6. Sec. 12: Provide 2-3 additional (blank) comment lines for Corrective Actions and Locations, items A-G.
(Rev. 2) Addressed.
7. Sec. 12: Under Stormwater Pollutant Controls, recommend delete Item L (met via design and VSMP plan
review /approval). (Rev. 2) Addressed.
SWM Plan
Water Quality: Please continue to coordinate with Ana Kilmer, Albemarle County on purchase document
requirements for county approval of nutrient credits to satisfy VaRRM spreadsheet calculation that 1.38
lb/yr phosphorus reduction is required for this project, based upon site land cover conditions. Ana will
check form of documents, as well as availability /eligibility of proposed bank to provide required credits.
(Rev. 1) Addressed. Applicant outreach (e-mail) /plans confirm VRRM.xls calculated value of 1.38 lb.
phosphorus load reduction is accurate.
Water Quantity: Revise and re -run routings (if necessary) using correct Device #1 pipe outfall diameter
(24") and length (179'). This should not affect review approval, but it is important that routings reflect
Engineering Review Comments
Page 3 of 6
proposed design. (Rev. 1) Addressed. Applicant: As outfall pipe does not control peak flows for 1 year
(channel), 10 year (flood protection) or 100 year event, routing has not changed.
Note: Routings have been discussed and small -diameter orifice size (<3") eliminated as a design option, at
County direction. Small diameter orifices have a tendency to block and short-circuit detention performance.
Routings are acceptable to Albemarle and the county supports detention pond design relative to water
quantity pre- /post development 1-yr, 24 hour storm event release rates, relative to channel protection.
(Rev. 1) As follow-up to SWM report d. 3/26/18, rev. 6/15/18, request following minor edits:
a. Pg. 86, report: revise RV post-dev subscripts to ref. A, B, C, D (B, D are not listed) —call if ques.
(Rev. 2) Addressed.
b. Pg. 87: Qpeak pre-dev nsc + Qpeak pre-dev n=0.86cfs does not match pg. 4 Executive Summary table.
Revise Executive Summary table to show combined Q1-year peak post n( BCD) < Qpeak pre /Ex. site (0.86cfs).
(Rev. 2) Addressed. Applicant response: Executive summary table is comprised of SCS method
runoff peak values. These are tied in to the hydrographs provided for the pre and post
development areas as well as the routing through the proposed pond. The Qpeak pre-dev ABC + Qpeak pre-
dev n values are derived via the Virginia Runoff Reduction Method which incorporates the rational
method for peak discharges. Due to the difference in methods, the values are slightly different.
c. Revise table below to show Total Combined Post -development (1-year) discharge=0.6cfs. (Rev.
2) Addressed. Applicant response: Total discharge for combined post -development has been
routed to a common study point and incorporates time of concentration rather than direct add of
peak discharges. Peak post development discharge based upon the SCS method is 0.5cfs.
Post Development Flow Rate Summary Table
Storm
Pre-Dev.
Post-Dev.
Post-Dev.
Post-Dev.
Post-Dev.
Total
Event
Peak Flow
Peak Flow
Peak Flow
Peak Flow
Peak Flow
Combined
(24-hour
Rate (cfs)
Rate (cfs)
Rate (cfs)
Rate (cfs)
Rate (cfs)
Post -
duration)
(allowable
from Pond
from Area
from Area
from Area D
Development
release)
(Area A)
B (direct
C (direct
(direct
discharge
discharge)
discharge)
discharge)
(cfs)
1-year
0.3 1
1 0.3
1 0.1
0.0
0.2
0.5
10-year
3.
2_7
1 0.2
0.1
0.6
3.0
Please note: Digital .PDF of (revised) Stormwater Management Report is sufficient; no hardcopy required.
(Rev. 2) New: Recommend Note stating detention is for water guanti compliance, only. VA Stormwater
Design Specification No. 15, Extended Detention (ED) Pond, specifies standards for quali control (phosphorus
load reduction credit); water quality requirement is met via offsite nutrient credit purchase.
(Rev. 1) All remaining 5/23/18 SWM Plan comments Addressed.
4. Sheet 17:
a. Section, Detention Pond Outlet Structure Detail:
i. Bottom of structure El = 462.5 conflicts with note to extend riser f 12" below bottom of
pond; revise El.
ii. Revise label to read `extend riser ±12" below bottom of outlet barrel.'
iii. Clarify bottom of skimmer plate El=466.75 (please call to discuss).
iv. Provide elevation label, bottom of concrete base.
v. Confirm 5' X 5' concrete riser is square. Recommend revise label to clarify.
b. Provide dry pond plan view (sheet 5 view would work).
c. Label floor dimensions of dry pond (plan view) to aid inspection.
d. Pond Section detail does not include 3' sump; revise to show 3' sump.
Sheet 18:
a. Line 1, 2: Revise F.E.S. to read Flared End Section, if flared end section specified.
b. Show riprap (outfall protection) in storm drain profiles.
Engineering Review Comments
Page 4 of 6
c. Storm Drain Line 1: Recommend VDOT nomenclature; DI-2A, for example.
Sheet 19
a. Trash Rack Detail: Recommend show anti -vortex device dimensions, or provide note /description
of anti -vortex device with this detail.
b. Trash Rack Detail: Provide and show manway access via trash rack to detention pond riser, for
periodic maintenance inspection.
C. Energy Dissipator Detail: Specify outfall protection riprap stone size.
d. Energy Dissipator Detail: Confirm 12" PVC pipe sleeve drain diameter is accurate.
B. Pollution Prevention Plan (PPP)
The PPP content requirements can be found in County Code section 17-404.
1. See A., above. County template includes suggested PPP (Sec. 6). (Rev. 1) Addressed, but with request for
Sec. 6.E. identification of responsible person (request listed above). (Rev. 2) Addressed.
C. 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. (with Rev. 1)
(Rev. 1) All ESC Plan comments Addressed, but review below for 1 ref, 1-withdrawn, 1-NA comment.
Sheets 4, 5
a. Sequence of Construction, Phase II, Note 13: Revise to require inspections at least once every four
(4) business days, or at least once every five (5) business days and no later than 48 hours following
a measurable storm event (>0.25" rainfall; on -site rain gauge). —ref. VPDES CGP VAR10, Part 1
/B.4. (d)1.
d. The applicable SWPPP inspection requirements specified in Part II F 2 shall be amended as
follows:
(1) Inspections shall be conducted at a frequency of (i) at least once every four business days or
(ii) at least once every five business days and no later than 48 hours following a measurable
storm event. In the event that a measurable storm event occurs when there are more than 48
hours between business days, the inspection shall be conducted on the next business day;
and
b. Albemarle County General Construction Notes for Erosion and Sediment Control Plans, Note 19:
Revise to require inspections at least once every four (4) business days, or...
c. Albemarle County General Construction Notes for Erosion and Sediment Control Plans, Note 12:
Revise Virginia Regulations VR 625 02 nn to read Virginia Code 9VAC25-840-40.
d. Erosion Control Notes (#):
i. (L) Replace `Governing Authority' with Albemarle County.
ii. (3.) Extend sentence; Add: `...perimeter sediment control measures have been installed,
and Contractor has received a Grading Permit from Albemarle County. Virginia Erosion
and Sediment Control Handbook Standards and Specifications, 3' Edition, 1992, applies
to this project.'
iii. (4.) Add: `(Ref. VESCH, 1992)'
iv. (5.) Add: `(Ref. VESCH, 1992; Std. & Spec. 3.31)'
v. (6.) Revise inspection frequency to once every four (4) business days... Add: (Ref.
VPDES CGP VAR10 Part 1 /B.4.(d)l.)'
vi. (U Add: `(Ref VESCH, 1992)'
vii. (11.) Add: `(Ref VESCH, 1992; Std. & Spec. 3.32)'
viii. (12.) Add: `(Ref VESCH, 1992; Std. & Spec. 3.05)'
ix. (14.) Add: `(Ref. SWPPP booklet, Sec. 6, SWPPP Exhibit)'
x. (15.) Add: `Paved construction entrance with wash rack is required (Ref. PCE Detail)'
xi. (16.) Add: (Ref. VESCH, 1992)'
xii. (19.) Add: `(Ref VESCH, 1992; Std. & Spec. 3.31)'
Engineering Review Comments
Page 5 of 6
2. Sheet 4: Provide Paved Construction Entrance (PCE) with wash rack (provide Detail).
3. Sheet 5: Dimension riprap (L x W x D) at outfalls, including the two outfalls in (eventual) dry pond.
4. Sheet 6: Provide PCE Detail —link: Albemarle County Design Standards Manual, P. 88:
htt)://www.albemarle.ora/unload/imaees/forms center/departments/communitv development/forms/desi
_standards manual/Albemarle_ County Design Standards_ Manual 2015-04-25_draft.pdf )
5. Sheet 8 f
a. Retitle, for VSMP Plan set, Site Layout.
b. Dimension island (radii /etc.) at entrance from Avon Street Ext.
c. Show storm lines pipes on sheet 8 in addition to sheets 5, 16. (Rev. 1) Comment withdrawn.
d. Eliminate keynotes O, W. These curb types do not appear to match VDOT standards.
e. Label and provide dimension for walkway fronting Avon Street Ext., if walkway proposed. (Rev.
1) NA: Ref. Site Plan.
f. Provide Note that dry pond will be posted: `No Trespassing; drowning hazard,' since sump depth
during 10-yr event may approach 6.46'.
g. Provide several entrance width dimensions that can easily be correlated to sidewalk, face of island,
west /interior end of island, etc.
h. Provide (with Final Site Plan) VDOT GC-12 label for ramp N of entrance.
i. Show SWM facility maintenance, access, and drainage easements. (Rev. 1) See General
Comments 4, 5.
6. Sheet 9
a. Recommend Wood Privacy Fence detail show posts set in continuous CIP wall.
b. Sidewalk Ramp Detail: Include detectable surface.
c. Wall Flume Detail: provide flume outfall protection detail. Dimension riprap /provide 2-year
velocity calculations for concrete flume.
d. Recommend consider (flume) expansion joint spacing of less than every ninety (90) feet.
e. Handrail Detail: some text is unreadable. Provide legible detail.
Sheet 10: Delete Type `A' C&G and `G' curb details. Use VDOT standards. Provide VDOT CG-7 detail.
Sheet 16:
a. Provide asphalt /concrete curb upslope of dumpster enclosure to prevent cross -lot drainage
entering enclosure and transporting contaminants. With curb design, ensure positive drainage to
limit trapped or standing water.
b. Show 4' wall flume outfall protection (riprap; 2-year velocity).
Please submit four (4) copies of full-size VSMP plans with original PE -seal, and two (2) print copies of the
SWPPP, with PE -seal. With cover letter, please state plans are not for review, but Approval.
—please send to my attention
Thank you
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
Engineering Review Comments
Page 6 of 6
information. The completed forms will need to be submitted along with court recording fees.
I will share draft Maintenance Agreement (shared via link /6-18 email) with County's Management Analyst,
who will be in touch (Ana Kilmer).
After the Maintenance Agreement is recorded, Engineering use information from recorded agreement to revise a
(.docx) Deed of Dedication template (SWM Facility /Drainage Easements), will then send edited document to
Applicant for signature /return to County for County signature, and final return to Applicant for recordation.
Please note: Easement plat requires a separate Application, a separate review /Approval process. We urge
Applicant to proceed with Easement plat, and submit Easement Plat Application as soon as possible. Link:
htW://www.albemarle.org/upload/images/forms_center/departments/Communi!y Development/forms/applications/Ea
sement Plat & Checklist.ndf
Deed of Dedication of Easement must be recorded prior to VSMP plan approval.
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 disturbed, 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 maybegin.
County forms can be found on the county website forms center under engineering;
Ifyou have any questions, please contact me at janderson2@albemarle.org, or 434.296-5832 ext. 3069. Thank
you for your patience.
J. Anderson, Engineering Division
(i:\drive) WPO201800026 Caliber Collision 071718rev2b-save.doc