HomeMy WebLinkAboutWPO201600027 Review Comments WPO VSMP 2016-04-25COUNTY 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: Wildrock VSMP
Plan preparer: Keane Rucker /Justin Shimp, Shimp Engineering, 201 E. Main St.
Suite M, Charlottesville, VA 22902 f iustin(&shimp-enizineering com]
Owner or rep.: Heartrock Family Farm LLC, 2521 Summit Ridge Trail
Charlottesville, VA 22911
Plan received date: 15 Apr 2016
Date of comments: 25 Apr 2016
Reviewer: John Anderson
WP0201600027
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. Provide SWPPP, as with past projects. Template Attached.
B. VSMP: SWPPP: Stormwater Management Plan (WP0201600027)
VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This plan is
disapproved for reasons provided in comments below. The stormwater management plan content requirements can be
found in County Code section 17-403.
VSMP Plan (booklet) d. 15 -Apr 2016 contains: cover letter; VRRM Re -development spreadsheet; VDOT
LD -268, post -development tdrunoff calculations for ditch /culvert -sizing (Rational Method); post -
development drainage map; soils data; NOAA precipitation frequency. It does not contain: Q1, -2, -10
analysis based on SCS 24 -hr TR -55 model; SWM design based on 9VAC25-870-66.B.3. (channel
protection, i.e. energy balance), 9VAC25-66.C.1 or -66.C.2 (flood protection -discharge to systems that
currently experience, or do not experience localized flooding); or SWM water quality design based on
9VAC25-870-65. Please provide SWM design based on 9VAC25-870-65 and 9VAC25-870-66. Note:
one -paragraph mention of design without water quality or water quantity design elements is without parallel,
and startling. It is atypical of Shimp Engineering plan submittals, and surprising. Engineering and Planning
have been in contact with Applicant since Jan -2015. Project site plan, VSMP, and special permit expense
may end any chance this project will be built, and we implore complete design submittal that reflects VSMP
plan requirements. We encourage close examination or consideration of:
a. 9VAC25-870-66.D. —"If all runoff from the site is sheet flow and the conditions of this subsection
are met, then no further water quantity controls are required."
b. Ref. discussion /email Q. Anderson -Justin Shimp) on 19 -Apr: Water quality compliance that relies
on forest/open space in post -developed condition requires deeded restriction and easement plat.
This is an option. Alternatively, re-examine VRRM re -development site data land cover acreage.
Engineering Review Comments
Page 2 of 3
28.26 Ac. is invalid; it exceeds parcel acreage. Unless Applicant places 23.97 Ac. in restricted
covenant easement (forest /open), site data requires revision. Engineering recommends:
i. Examine effect of reduced site area (revise site data tab).
ii. Calculate Area of proposed trails (stone/mulch/soil) north of existing structure; tabulate
areas. Mulch and soil are pervious. Do the same south of existing structure. Tabulate.
Engineering requests: N/S Trail pervious /impervious surface chart /table. Do not include
these areas in VRRM .xls. County recognizes that network of narrow crushed stone and
primitive walking trails to access remote or central areas at Heartrock will not result in
changes to the predevelopment runoff characteristics of the land surface after construction
and stabilization are complete. Sheets C3 /C4 show pre- /post -developed areas. It
appears design proposes equivalent (or slightly less) impervious area than currently
exists. Revise VRRM .xls and design, accordingly.
iii. If off-site nutrient purchase is selected, we urge consideration of on-site features that may
minimize total phosphorus load reduction required.
iv. If on-site BMPs are required /selected, we urge consideration of any practice that may
minimize scale of on-site best management SWM facilities; for example, dissipate ditch -
line flow via series of turnouts to level spreaders that convert concentrated flow to sheet
flow. If BMPs are required, please consider simpler practices —dry or wet swales, for
example, near parking areas. The county seeks to minimize Applicant design
/construction expense, and urges minimum approach to design.
v. VRRM .xls requirements may be reduced by treating 14' W gravel site access as a linear
design element (design Q, ditch runoff does not reach stream to east, or concrete ditch
northeast of site. If design uses series of timber level spreaders or equivalent, VRRM
phosphorus load reduction requirements (BMP, or nutrient purchase) may be minimized.
C. VSMP: SWPPP: Erosion Control Plan (WPO201600027)
Virginia Code §62.1-44.15:55 requires the VESCP authority to approve or disapprove an ESCP. This plan is disapproved
for reasons provided in comments below. The erosion control plan content requirements can be found in County Code
section 17-402.
1. C2 —Include demolition in sequence of construction; existing site access or parking that will be removed,
for example.
2. C3 —Show existing features to be removed (TBR). Consider ESC for items TBR, as necessary.
3. C3 —Label existing rectangular shaded features (existing parking?). Label surface material of these features.
4. C4:
a. Show trees/tree lines (compare with C3).
b. Show all proposed grading. Ref. culverts F/G, for example: no grading shown at these locations.
c. Label Area of Disturbance —4.68 Ac.
d. Though Site Plan identifies features, please label: overflow parking; parking area surface type;
building footprint dimensions (i.e., impervious area); access width (14'); circular features;
walkway/trail width/surface type; etc. There is a general lack of descriptive information.
Reviewers need to understand site without needing to refer to Site Plan.
5. C5 —Show sediment trap profile, not just VESCH plate image. Show existing grade/ground elev. in profile.
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,
Engineering Review Comments
Page 3 of 3
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 request a pre -construction conference by completing a 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;
httt)://www.albemarle.org/deDtforms.asD?del)artinent--cdenawt)o
Thank you -434.296-5832 —x3069
File: WP0201600027 Wildrock 042516