HomeMy WebLinkAboutWPO201800095 Review Comments WPO VSMP 2019-04-30Phone (434) 296-5832
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OF Alga.
VIRGSry�P
COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902-4596
VSMP Permit plan review
The Vistas at South Pantops
WP0201800095
Roudabush Gale & Assoc.
South Pantops II Land Trust / Charles
Hurt
Dec. 14, 2018
March 29, 2019
Jan. 17, 2019
April 30, 2019 (Rev. 1)
David James
Fax (434) 972-4126
[riki@roudabush.com]
[]
[dj ames@albemarle.org]
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. General
1. Cover —
a. Change to `VSMP plan for' [Project name].
b. Remove SDP#, add WPO#201800095.
c. Remove approvals block, not needed.
(Rev.1) Addressed.
2. (Rev.1) Please submit a floodplain development application/plan to the county. A floodplain
development permit is required prior to issuance of grading permit.
B. 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.
1. Correct Registration Statement — 3. neg. (-) missing in front of longitude; 7. Albemarle
County is the MS4 operator
(Rev.1) Addressed.
2. Submit (2) copies of the SWPPP for review. Template at
htlp://www.albemarle.org/upload/images/forms_center/departments/Community Development/f
orms/En . ine�ering_and_WPO_Forms/Stormwater_Pollution_ Prevention_ Plan_ SWPPP_ template.
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(Rev.1) Complete section 9: Sign Certification. Section 4-6: Provide reduced size copies of
SWM, E&SC and PPP plan upon WPO plan approval.
3. Rivanna River is listed as an impaired water with TMDL.
(Rev.1) Addressed.
C. Pollution Prevention Plan (PPP)
The PPP content requirements can be found in County Code section 17-404.
1. Update to show all proposed clearing/grading activities, paving operations, landscaping
operations, E&S controls, fueling, vehicle/equipment washing areas/locations on the PPP as
applicable. Also, show locations where concentrated stormwater discharges to and from site.
(Rev.1) Partially addressed; Not all temp. E&SC measures shown, show grading, paving &
landscaping operations.
D. 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. Sheet 9 —
a. Provide copy of report/study. Need to verify that the 1% area is in the drainage area
of Rivanna's watershed to meet the requirement. Is there a map of the drainage
area & point taken?
(Rev.1) Addressed.
b. Show drainage area of the site going to the outfall point and the point of analysis. The
limits of analysis for channel protection may need to be analyzed, and if energy balance
not met must be determined if adequate. 19VAC25-870-66B}
(Rev.1) You're showing a grouted riprap channel that goes to a riprap outlet
protection that goes to a natural drainageway. It does not appear that the design
meets Channel Protection requirement under Part II B "When stormwaterfrom a
development is discharged to a natural stormwater conveyance system,... " it must
meet Energy Balance. 19VAC25-870-66B 3.)
Limits of Analysis is not currently being met at point of discharge.
The Limits of Analysis cannot be used to satisfy channel protection when runoff
discharges to a natural drainageway.
You're showing that you do meet Flood Protection at the point of analysis shown on
sheet 9 though.
2. The outfall pipes from storm structure 4 should be adjusted (enlarged/raised, etc.), or be
made watertight based upon HGL. 1DSM, pg.141
(Rev.1) Addressed.
3. All drainage from public ROW should be shown in an easement. Minimum width 20' & meets
DSM, pg. 14 width requirement
EASEMENT NVIDTH = DIAMETER + 2' + 2 tH-5') + 10' (20' NUN.)
(Rev.1) Show drainageway (outside R/W) in an easement for proposed flume -channel off
Rt. 1140.
4. Sheet 10 - Pipe (2-1) & (3-2)
a. Velocity shall not exceed 15 ft/s in pipes.
(Rev.1) Hold velocity under 20 ft/s in pipes and 10 ft/s at outlet.
b. Provide anchor blocks at every other pipe joint for storms pipes over 16% slope. A "step
down " manhole system can be used in steeper terrain to reduce pipe gradient.
(Rev.1) Recommend adding additional MH(s) to lower the velocity at outlet or
provide alternate design.
c. Correct the tables - node IDs showing `64' or don't match the nodes shown on Sheet
5 map.
(Rev.1) Acknowledged.
5. Contact Ana (akilmergalbemarle.org) for information on nutrient credit agreement and other
documentation requirements.
(Rev.1) Acknowledged; Nutrient credit agreement required prior to WPO plan approval.
6. (Rev.1) Show pre -development drainage area map. Show Tc line, analysis/determination of
peak Q.
7. (Rev.1) Sheet 9 - The Forest/Open Space cannot include portion of river. Show protected
Forest/Open Space in an easement.
8. (Rev.1) Submit an easement plat for the Forest/Open Space easement. A deed of dedication
will be prepared and sent when the plat is finalized. The deed & plat must be recorded
prior to VSMP plan approval.
9. (Rev.1) Sheet 10 — The reported velocities don't match for the channel. 23.67 ft1v in the table
versus 11.68 ft/s in the channel report.
E. 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 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. Cover sheet - Plans shows topography was last verified Dec. 2017. All topography should be
at least visually field verified by the designer within the last year. Provide date when site
was last inspected verifying existing conditions.
(Rev.1) Addressed.
2. Sheet 3 —
a. Label contours elevations.
(Rev.1) Addressed.
b. Show CIP symbol for temp. culvert.
(Rev.1) Addressed.
c. Show MU symbols, mulch to be applied immediately following seeding.
(Rev.1) Addressed.
d. Show B/M symbols to slopes in rear of property — Treatment 2 (EC-3) for slopes 3:1
or greater. {VADEQ ESC HB, Spec. 3.35,3.361
(Rev.1) Addressed.
e. The sediment traps embankment appears to exceed the max height requirement of
5' (VADEQ ESC HB, Spec. 3.13). The outlet shall extend to original grade.
(Rev.1) Addressed.
Sheet 4 —
a. Show RR symbol for riprap drain off of Rt. 1140/sidewalk. Show upstream inlet and/or
indicate where flow is coming from.
(Rev.1) Sheet 5 — 0.02 ac to proposed flume -channel appears incorrect. Show
drainage area going to the flume -channel.
b. Show SCC at pipe outfall and OP at end to receiving channel. SCC & OP design shall
meet spec per ESC HB.
(Rev.1) Extend proposed channel to edge of natural drainage channel. If possible,
use OP before entering natural channel. OP shall be constructed with no slope along
its length (0.0% grade) — same invert elevation of receiving channel.
c. Remove grading activity from on the south side of site impacting preserved slopes.
(Rev.1) Addressed.
d. Show roof drains from building and where they connect to.
(Rev.1) 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 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:
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;
hLtp://www.albemarle.orWdeptfonns.asp?department=cdenMo