HomeMy WebLinkAboutWPO202000007 Review Comments WPO VSMP 2021-02-22COUNTY 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:
Hark Vineyards Tasting Room - VSMP
Project file number:
WPO2020-00007
Plan preparer:
Jonathan Showalter, PE, Timmons Group - 608 Preston Ave, Suite 200,
Charlottesville, VA 22903 [ ionathan.showalter(a timmons.com ]
( Initial)
Clark Gathright, 100 W Street, NE, Suite 200, Charlottesville, VA 22902
[cgathri ght(adgarachs. coral
Owner or rep.:
Herald Ventures, LLC; 2417 Huntington Rd., Charlottesville, VA 22901
[ aaron(a),harkvinevards.com ]
Plan received date:
10 Feb 2020
(Rev. 1)
2 Feb 2021
Date of comments:
9 Mar 2020
(Rev. 1)
22 Feb 2021
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 for reasons listed below. 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. Sec. 1, Registration Statement is incomplete. Complete Sec. 1 as condition of VSMP /WPO plan approval.
a. Sec. I.A. Operator /Permittee information: Section is blank, please complete. (Rev. 1) Not
addressed.
R. Sop,. Ic-'emmen 121AS of po-olopment please . Review error, withdrawn.
d. Sec. VI /Certification: Please complete. (Rev. 1) Not addressed.
e. New: Sec. ILB., C., E., G. I. -Complete all sections of Registration Statement. Please QC.
2. Sec. 4, 5: Update these sections with revised ESC and SWM plan sheets, once comments are addressed.
(Rev. 1) Persists.
3. Sec. 6.A. / Exhibit: Indicate location rain gauge. (Rev. 1) Addressed. As follow-up:
a. Provide silt fence downslope of stockpile.
b. Provide depression /small trap to collect vehicle wash waters (not VESCH design /small).
c. Provide catchment /small trap to intercept runoff from dumpster, mortar mix, temp. toilets. These
items are shown on ungraded slopes with no downslope catchment, or barrier to overland flow.
4. Sec. 6.E. - List named individual responsible for pollution prevention practices prior to VPDES permit
registration. (Rev. 1) Persists. List named individual prior to VAR10 CGP Registration for state permit.
5. Sec. 8. - List named individual qualified to perform compliance inspections prior to VPDES permit
registration. (Rev. 1) Persists. List named individual prior to VAR10 CGP Registration for state permit.
Engineering Review Comments
Page 2 of 8
6. Sec. 9., Signed Certification: Individual who prepared SWPPP document must sign as condition of VSMP
/WPO plan approval. Albemarle cannot register project with DEQ until SWPPP Sec. 9 is complete. (Rev. 1)
Persists.
7. Sec. 11 - Include copy of 26-p. 2019VARIO VPDES General Construction Permit. (Rev. 1) Addressed.
8. Sec. 12 - Include template inspection forms. (Rev. 1) Addressed.
9. Include 2019 Notice of Termination form. Link:
htto://www.albemarle.or� uupload/images/forms center/departments/Community Development/forns/Engineeringand
WPOForms/CGPNotice of Termination 2019 FINAL_201904.odf (Rev. 1) Not Addressed.
10. Revise SWPPP title to include ref. to VSMP /WPO2020-00007. (Rev. 1) Addressed.
B. Pollution Prevention Plan (PPP) - See above. Limited follow-up items.
The PPP content requirements can be found in County Code section 17-404.
C. Stormwater Management Plan (SWMP)
VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This
plan is disapproved for reasons listed below. The stormwater management plan content requirements can be
found in County Code section 17-403.
1. A SWM Facility Easement Plat is required for this project. (Rev. 1) Withdrawn. Initial comment is
revised to require stormwater management maintenance agreement, Sec. 17-415, which ensures county
access for periodic inspection/maintenance, and stipulates owner obligation to maintain SWM facilities.
Platted easement is not, however, required. Platted easement with deed is required for: subdivision
developments [14-428], site plan developments [18-32.7.4.2], and if a forest -open space (FOS) area
/acreage value is entered as post -developed land cover in VRRM.xIs [DEQ Guidance Memo No. 16-2001,
May 2, 2016]. Chapter 17 alone does not stipulate easement requirements for SWM facilities. Ch. 14 and
18, however, do. This site does not require a site plan and does not propose subdivision or FOS Easement,
therefore, platted easement and SWM facility deed are not required. A SWM Facility Maintenance
Agreement and surety /bond for SWM facilities are required.
-T- .0 C0.0
2. Revise title to include VSMP /WP02020-00007. (Rev. 1) Addressed.
3. Revise Note 2. Shift install detention piping to sequence step 8., or revise notes to ensure detention system
remains off-line until upslope areas are stabilized. (Rev. 1) NA - Design revised.
4. Source of topography is given as county GIS. Provide source of survey basis of design (SWM facility
/storm pipe design elevations). (Rev. 1) Addressed.
5. Revise drawing index, C-1.3 to ref. Site Layout. A VSMP/WPO plan cannot include /approve a site plan.
(Rev. 1) Addressed.
C--1-1 C2.0:
6. Identify and provide ownership data for adjacent parcels (TMP #, Owner name, deed bk.-pg.). (Rev. 1)
Partially Addressed. As ollow-W: Provide large scale image that depicts entire development parcel, with
every adjacent TNT identified (TMP#, owner, deed bk.-pg.). Also: list intersecting road distance SE / NW.
7. Recommend coordinate entrance location with VDOT. Acquire VDOT permits, as needed. (Rev. 1)
Persists. Entrance is shown on C3.4.
8. Label critical slopes. (Rev. 1) Withdrawn. No critical slopes in vicinity of development (lot /building)
C- 4 C4.0
9. Revise sheet title to site layout. (Rev. 1) Addressed.
10. Recommend label typical parking space dimensions. (Rev. 1) Addressed.
11. Show yard drain outfall (show connection to SWM system, or release point). (Rev. 1) NA - Design
revised.
12. Provide 50' gas pipeline easement bk.-pg. reference. (Rev. 1) Addressed.
13. Provide note listing depth (or suspected depth) to gas pipeline. (Rev. 1) Withdrawn.
14. Provide precautionary Note to contractor concerning grading within gas pipeline easement. (Rev. 1)
Engineering Review Comments
Page 3 of 8
Persists —Provide Note on C5.0.
15. Provide retaining wall details, for example: type, length, Max. height. (Rev. 1) NA — Design revised. A
retaining wall (15' high, C4.0 C5.0) is incorporated into building design to be reviewed as part of building
permit application review/approval process.
16. Provide SWM facility description (material, slope, overall L x W x DIA x # lines). (Rev. 1) NA — Design
revised.
17, Recommend label post -developed improvements, i.e.: asphalt parking, concrete walk, etc. (Rev. 1)
Addressed.
18. Label two culverts near vineyard entrance. (Rev. 1) NA — Design revised.
19. Recommend show site water supply (well). (Rev. 1) Addressed.
C-1.3
20. VaRRM.xls land cover summary post -development lists Final Post Dev Site Rv =0.53, revise Energy
balance equation to use this post-dev Rv. (Rev.1) NA — Design revised.
21. Ensure energy balance equation indicates compliance. (Rev. 1) Persists. Also, item 50. below.
22. Provide Q(1) un-detained calculations, since methodology unclear. 14.31 cfs does not match C-1.9
hydrographs. Label un-detained drainage divide in image `Overall drainage areas.' Align graphic,
routings, calculations, energy balance, and compliance narrative with aim toward simplicity, and clarity.
C-1.3 and C-1.9 provide a partial, somewhat confusing analysis of drainage and SWM compliance data.
(Rev. 1) NA — Design revised.
23. Revise using I.F. = 0.8. Engineering check, energy balance: Qpost = (0.8)(14.50)(0.20)/0.53 — Qoost uadetaMeA.
(Rev. 1) Persists —Although design revised, this comment is relevant. Water quantity compliance requires
energy balance since proposed discharge is to a natural conveyance (ri review item 50., below). Note:
Simply altering location of outfall does not address comment. Given slopes across site, ELS is a non -viable
stand-alone concentrated -to -sheet flow transition device. Runoff must be detained (reduced) on this site.
24. Provide post -developed impervious cover table, listing impervious area (sf) of. (Rev. 1) Persists.
a. Drive
b. Walks
c. Parking
4- Buildings
} Bldg,
4- Bldg.
iii.
E46-
25. Show existing structures (structures visible in GIS). (Rev. 1) Addressed.
26. Label terrain contours, provide elevation labels. (Rev. 1) Addressed.
27. Label roads beyond property boundary. (Rev. 1) Addressed.
28. If nutrient credit purchase proposed, coordinate with Ana Kilmer, Management Analyst prior to purchase.
(Rev. 1) Persists —Plan proposes 1.59 lb. nutrient credit Purchase.
C14 Design Calculations and Narrative, Feb-5, 2021 (Timmons Group)
29. Culvert 4 proposed 27.5% exceeds Max. 16%. Pipe grade steeper than 16% requires anchors. Ref. VDOT
drainage manual, 9.4.8.7, maximum grades. (Rev. 1) Not addressed. Though design has changed and
culvert 4 does not exist, design proposes pipe 101, 19.74%. Provide anchor block detail, notes, narrative,
sequence, etc. to guide installation of anchors for pipe >16% slope, per VDOT Drainage Manual standards.
Provide /show anchors, anchor detail, notes, narrative, sequence, etc., requisite for pipe 101 installation, for
plan approval. Ref. Cale. reportD. Note
9.4.8.7 Maximum Grades
Slopes Mat incur uniform flow velocities in excess of 10 fps should be avoided because
of the potential for abrasion. Slopes in excess of 16% are not preferred because of the
need for anchor blocks. When anchor blocks are used, they should be Installed at
every other pipe Joint, as a minimum. (See Special Design Drawing No. A-73 and MA-
73 for Anchor Details for Concrete Pipe)
corrugated pipe may be used on steep stripes in situations similar to chose where
shoulder slot inlets are proposed. Completed pipe should not be used in areas where
Is flow is expected to carry an abrasive bed load or that have PH and resistivity factors
beyond the ranges specified in the Allowable Pipe Type Table C in Standard PC-1 of
the VDOT Road and Bridge Standards. (See VDOT's Road and Bridge Standard PI-1,
for Anchor Details for Corrugated Pipe)
In steeper terrain, large elevation differences can be accommodated using drop
structures, otherwise known as 'step down' manholes, M reduce the pipe gradient.
Rev. 7114
Engineering Review Comments
Page 4 of 8
30. Design, show, and label riprap outfall protection for culverts I and 5. (Rev. 1) NA - Design revised.
31. Provide LD-229, storm culvert design tables for all culverts. Avoid flow velocities in excess of 10 fps.
(Rev. 1) Partially addressed. Asfollow-up:
a. List pipe 101 outfall V2_n.
b. Provide outfall protection (OP) sized for outfall flow /velocity.
c. Label pipe outfall riprap dimensions (L x W x D).
32. Provide storm profiles: label INV IN/OUT, rim, etc. (Rev. 1) Addressed.
33. Label structures. Use VDOT nomenclature. (Rev. 1) Addressed.
34. Provide Nyloplast typical details, as needed. (Rev. 1) Addressed.
35. C5.0 Provide flow arrows to indicate direction of flow in pipes. (Rev. 1) Not addressed.
36. If culvert 2 passes beneath proposed retaining wall, show retaining wall in storm profile. (Rev. 1) NA -
Design revised.
37. Provide design details of stoFm detention system,see comments elsewhere (slope, DIA, overall length, #
lines, etc.). (Rev. 1) NA - Design revised; detention eliminated.
38. If storm detention is a Mfr. system (ADS, Contech, etc.), provide manufacturer recommended installation,
and periodic maintenance guidelines (on the plans). (Rev. 1) NA - Design revised.
39. Ensure manways to detention system are accessible. Provide clear view of 15" HDPE end cap and debris
cage from above, without requiring inspectors to enter 4' MH confined space. (Rev. 1) NA - Design
revised.
40. Culvert 5: Outfall is shown at elev. 602', while invert out is listed as 600.0'. Revise for consistency. (Rev.
1) NA - Design revised.
41. Provide swale adequacy calculations (pre -post listed as 3.35 and 3.55 fps, respectively). Provide 10-yr
swale capacity (efs) and 2-yr swale velocity (fps) calculations. (Rev. 1) NA -Design revised.
42. Provide culvert 3 velocity /capacity calculations; see comments elsewhere re. LD-229. (Rev. 1) NA -
Design revised.
43. Show, design, and label outfall protection, culvert 3. Provide channel protection, as needed, for drainage
formed by proposed and existing contours downslope of culvert 3. (Rev. 1) NA - Design revised, but
please see ESC Plan, item 14.h., below.
44. Recommend steeper slope for culvert 2, flatter slope for culvert 4. (Rev. 1) NA - Design revised.
C-1.8
45. Provide additional plan /profile data for detention system: (Rev. 1) NA - Design revised.
a. Elev. base of bedding,
b. Label hatch to 15" pipe,
c. Show debris cage for 2.5" DIA orifice in end cap,
d. Provide additional endcap detail (specify watertight, means of affixing to 15" HDPE, end cap
material, etc.),
e. Label culvert 5,
f. Label MH diameter,
g. Label /revise rectangular image in right-hand profile view of detention structure, which appears
inconsistent with plan view.
46. Provide debris cage detail (2.5" DIA orifice). (Rev. 1) NA - Design revised.
47. Add .PDF image of Construction Record Drawing (As -built) for VSMP to the plans (link:
http://www.albemarle.org/ul)load/images/forms center/departments/Community Development/fonns/Engineerin
g_and WPO Forms/WPO VSMP Construction Record Drawings Policy 23May2014.pddf ). (Rev. 1)
Addressed.
48. Submit easement plat. Easement plat must be recorded prior to VSMP /WP0202000007 approval. (Rev. 1)
Review error /withdrawn. Also, SWM review item 1. above.
New
49. C8.0
a. Reconcile pipe 101 profile 12.00% slope with Cale. report, p. 5, pipe 101 slope 19.74%.
b. Str. 104: Provide label requiring Y2" steel plate in floor of NM.
c. Recommend Note requiring 95% compaction beneath pipe 105 /str. 106, since in fill sections.
Engineering Review Comments
Page 5 of 8
50. 9VAC25-870-66.D. /copied from
httos://Iaw.Iis.virginia. gov/admincode/title9/agencv25/chai)ter870/sec6on66/
D.Increased volumes of sheet flow resulting from pervious or disconnected impervious areas, or from physical
spreading of concentrated flow through level spreaders, must be identified and evaluated for potential impacts
on down -gradient properties or resources. Increased volumes of sheet flow that will cause or contribute to
erosion, sedimentation, or flooding of down gradient properties or resources shall be diverted to a stormwater
management facility or a stormwater conveyance system that conveys the runoff without causing down -
gradient erosion, sedimentation, or flooding. If all runoff from the site is sheet flow and the conditions of this
subsection are met, no further water quantity controls are required.
a. Initial design included detention, a SWWM facility that would limit runoff without causing down -
gradient erosion, sedimentation, or flooding.
b. Please revisit /restore stormwater management facility design to this V SMP.
c. Revise /delete reference in plan narrative, or calculation report that water quantity is met by sheet
flow, without detention, with an ELS. Downgradient slope /contours indicate a nearly proximate
existing natural conveyance channel will concentrate increased volumes of sheet flow.
d. Sheet flow Vol. increases with this project with construction of significant impervious land cover.
e. Divert site runoff to a stormwater management facility or a stormwater conveyance system that
conveys the runoff without causing downgradient erosion, sedimentation, or flooding.
f. Water quantity compliance is not met with this design; please see images, below.
Y
51. Engineering urges applicant to coordinate septic field /plan review with VDH at earliest convenience.
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 disapproved for reasons listed, below. The erosion control plan content requirements can be found in
County Code section 17-402.
C-1.5
1. It is not apparent how proposed buildings, [and] parking, and °"'^ � a �,. . can be built while
maintaining elean wate diversions. Ensure diversions and all ESC can be maintained, as proposed,
Engineering Review Comments
Page 6 of 8
throughout construction. Show pfopesed/_ossibl . inte_ al aeeess between SR «A and e6fiStRieti011 Site.
(Rev. 1) Persists.
2. Label OP 1, OP2. (Rev. 1) NA —Design revised.
3. Recommend initial location for staging and parking, solid waste dumpster, port-a-john, and concrete
washout that does not require relocation for installation of detention system, or culvert 5. (Rev. 1)
Addressed.
4. Concrete wash -out station must drain to a trapping device, show location of trapping device. (Rev. 1) Not
addressed.
5. Provide design details for level spreader (ELS) at outfall of culvert 3. Ref. VA DEQ Stormwater Design
Specification No. 2, Table 2.2 for ELS design criteria (13 lin.ft. per each 1 cfs of inflow). (Rev. 1) May
persist. An ELS may transition concentrated release from a detention system /SWMfacility to sheet flow.
Provide design details for any ELS that persists as a design feature.
6. Include ELS, culvert 3, in SWM narrative. (Rev. 1) NA — Design revised.
7. Label all culverts on this plan sheet. (Rev. 1) Addressed.
8. Revise CE symbol at site entrance to PCE (paved entrance). (Rev. 1) Not addressed.
9. Provide additional existing contour labels, to aid review and analysis. (Rev. 1) Addressed.
10. Show Aabel sanitary line (crossing) in culvert 5 profile (proposed san. line from building to septic field).
(Rev. 1) Not addressed. Show Aabel sanitary line (crossing) in pipe 103 profile, C8.0 (FM crossing x 2).
C-1.7
11. Provide specific OP details (OPI, OP2). (Rev. 1) NA — Design revised.
12. Provide standard VDOT details: (Rev. 1) Persists.
a. PB-1 (pipe bedding)
b. ST-1 (safety steps)
c. IS-1 (inlet shaping)
New
13. C3.1: Provide paved wash rack detail;.88, ACDMS — link:
https://www.albemarle.org/Home/ShowDocument?id=270
14. Provide ESC phase interim to phase 1 (C3.2) and 2 0.3 that shows phase 2 final site grading with phase
1 sediment traps:
a. Phase 1 sediment traps (STI, ST2) control runoff from 3.82 Ac.
b. Phase 1 indicates trap placement, diversions, but apart from ST grading, no grading, whatsoever.
c. Phase 2 indicates final, built condition, but no sediment traps.
d. The interim phase, where all site work/grading and building construction occur while STs receive
diverted runoff during constructive phase, are not shown.
e. No ESC information is provided for the entirety of site grading /building construction.
f. Phase 2 presents sparse perimeter controls unequal to challenge of controlling runoff from 3.82
Ac. DA, once diverted to sediment traps, now released to newly -graded fill slopes.
g. Final grading proposes uniform contours that in theory support sheet runoff, once stabilized.
h. Stabilization may not occur for weeks, or months. Until site is stabilized, sediment traps must
operate with relocated diversions routing runoff from graded slopes to same /similar traps, with
diversions designed to convey runoff to the traps. Also, please consider temporary slope drain/s.
i. In ESC phase 2, no ESC or channel design is provided for concentrated runoff at intersection of
existing grade and proposed grade at NW side of site. The total vertical fall on the NW side of the
site is 40' (658' — 618'). Design permanent storm conveyance channel (maybe grass -lined if
velocity non -erosive /provide EC-2, EC-3 matting, as needed) where runoff concentrates.
Evaluate channel velocity, and armoring (EC-2, EC-3), as needed (blue arrow below).
k.
Engineering Review Comments
Page 7 of 8
11 `-
l .
Please consider permanent surface water diversion to collect /divert runoff from edge of parking
lot to base of slope, rather than across slope face. Design assumes slope stability, even if parking
lot runoff releases across 15'-20' H fill slope. Sheet runoff from impervious areas across newly
constructed fill slopes of this height will likely cause rill erosion, which may worsen, or prove
difficult or expensive to fix, once rills established. This is a recommendation. Also, see 18-
4.3.3.C.4.
C3.3: Perimeter controls for expanse of 15-20' high fill slopes are inadequate, or simply not
provided. Provide adequate phase 2peerimeter controh see image, below:
----------------r -
15. C3.2
a. Label ST floor dimensions in plan view (L x W).
b. Label ST stone weir dimensions, plan view (L x W).
Engineering Review Comments
Page 8 of 8
The VSMP permit application and plans may be resubmitted for approval when comments have been satisfactorily
addressed. For re -submittals please provide 2 copies of the complete permit package with a completed application
form.
Engineering staff is available for video -conference to discuss comments, in -person meetings are not yet possible
(Covid-19).
Process:
After approval, plans will have 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 have to be completed by the owner and submitted along with cash,
certificates or sureties for the amounts specified. The agreements will have to be approved and signed by the County
Attorney and County Engineer. This may take 24 weeks to obtain all the correct signatures and forms.
Stormwater Management Facilities Maintenance agreements will also have 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 have to be submitted along with court recording fees.
After bonding and agreements are complete, county staff will 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 have 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 must 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,
httD://www.albemarle.or&dei)tfonns.aSD?deDartment=cdenawDo
WP0202000007 Hark Vinev ards Tastine Roan 022221 rev I