HomeMy WebLinkAboutWPO202000007 Review Comments WPO VSMP 2020-03-14COUNTY 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: WP02020-00007
Plan preparer: Clark Gathright, 100 10' Street, NE, Suite 200, Charlottesville, VA 22902
[cizathrighta,,dgarachs.com]
Owner or rep.: Herald Ventures, LLC; 2417 Huntington Rd., Charlottesville, VA 22901
[ aaron(&harkvineyards.com ]
Plan received date: 10 Feb 2020
Date of comments: 9 Mar 2020
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 ESOP, (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, Operator /Permittee information: Section is blank; please complete.
b. Sec. IV.B. /Estimated project dates: Complete.
c. Sec. IV.F. /Common Plan of Development: please check yes.
d. Sec. VI /Certification: Please complete.
2. Sec. 4, 5: Update these sections with revised ESC and SWM plan sheets, once comments are addressed.
3. Sec. 6.A. / Exhibit: Indicate location rain gauge.
4. Sec. 6.E. — List named individual responsible for pollution prevention practices prior to VPDES permit
registration.
5. Sec. 8. — List named individual qualified to perform compliance inspections prior to VPDES permit
registration.
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.
7. Sec. 11 — Include copy of 26-p. 2019VAR10 VPDES General Construction Permit.
8. Sec. 12 — Include template inspection forms.
9. Include 2019 Notice of Termination form. Link:
httn://www.albemarle.ora/uDload/imaees/forms center/departments/Community Develonment/forms/Eneineerine and
WPO_Forms/CGP_Notice _of Termination _2019_FINAL _201904.pdf
10. Revise SWPPP title to include ref. to VSMP /WP02020-00007.
B. Pollution Prevention Plan (PPP) — See above.
The PPP content requirements can be found in County Code section 17-404.
Engineering Review Comments
Page 2 of 5
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
T-1.0
2. Revise title to include VSMP /WPO2020-00007.
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.
4. Source of topography is given as county GIS. Provide source of survey basis of design (SWM facility
/storm pipe design elevations).
5. Revise drawing index, C-1.3 to ref. Site Layout. A VSMP/WPO plan cannot include /approve a site plan.
C-1.1:
6. Identify and provide ownership data for adjacent parcels (TMP #, Owner name, deed bk.-pg.).
7. Recommend coordinate entrance location with VDOT. Acquire VDOT permits, as needed.
8. Label critical slopes.
C-1.2
9. Revise sheet title to site layout.
10. Recommend label typical parking space dimensions.
11. Show yard drain outfall (show connection to SWM system, or release point).
12. Provide 50' gas pipeline easement bk.-pg. reference.
13. Provide note listing depth (or suspected depth) to gas pipeline.
14. Provide precautionary Note to contractor concerning grading within gas pipeline easement.
15. Provide retaining wall details; for example: type, length, Max. height.
16. Provide SWM facility description (material, slope, overall L x W x DIA x # lines).
17. Recommend label post -developed improvements; i.e.: asphalt parking, concrete walk, etc.
18. Label two culverts near vineyard entrance.
19. Recommend show site water supply (well).
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.
21. Ensure energy balance equation indicates compliance.
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.
23. Revise using I.F. = 0.8. Engineering check, energy balance: Qpost = (0.8)(14.50)(0.20)/0.53 - Qpostunaetained.
24. Provide post -developed impervious cover table, listing impervious area (sf) of:
a. Drive
b. Walks
c. Parking
d. Buildings
i. Bldg.1
ii. Bldg.2
iii. Etc.
25. Show existing structures (structures visible in GIS).
26. Label terrain contours; provide elevation labels.
27. Label roads beyond property boundary.
28. If nutrient credit purchase proposed, coordinate with Ana Kilmer, Management Analyst, prior to purchase.
Engineering Review Comments
Page 3 of 5
C-1.4
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.
9.4.8.7 Maximum Grades
Slopes that 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 slopes in situations similar to those where
shoulder slot inlets are proposed. Corrugated pipe should not be used in areas where
the 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, to reduce the pipe gradient.
Rev. 7/14
30. Design, show, and label riprap outfall protection for culverts 1 and 5.
31. Provide LD-229, storm culvert design tables for all culverts. Avoid flow velocities in excess of 10 fps.
32. Provide storm profiles: label INV IN/OUT, rim, etc.
33. Label structures. Use VDOT nomenclature.
34. Provide Nyloplast typical details, as needed.
35. Provide flow arrows to indicate direction of flow in pipes.
36. If culvert 2 passes beneath proposed retaining wall, show retaining wall in storm profile.
37. Provide design details of storm detention system; see comments elsewhere (slope, DIA, overall length, #
lines, etc.).
38. If storm detention is a Mfr. system (ADS, Contech, etc.), provide manufacturer recommended installation,
and periodic maintenance guidelines (on the plans).
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.
40. Culvert 5: Outfall is shown at elev. 602', while invert out is listed as 600.0'. Revise for consistency.
41. Provide swale adequacy calculations (pre -post listed as 3.35 and 3.55 fps, respectively). Provide 10-yr
swale capacity (cfs) and 2-yr swale velocity (fps) calculations.
42. Provide culvert 3 velocity /capacity calculations; see comments elsewhere re. LD-229.
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.
44. Recommend steeper slope for culvert 2, flatter slope for culvert 4.
C-1.8
45. Provide additional plan /profile data for detention system:
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).
47. Add .PDF image of Construction Record Drawing (As -built) for VSMP to the plans (link:
http://www.albemarle.org/upload/images/forms center/departments/Community Development/forms/En ing eerin
g_and WP0_Forms/WPO VSMP Construction_ Record Drawings Policy 23Ma, 2�pdf ).
48. Submit easement plat. Easement plat must be recorded prior to VSMP /WP0202000007 approval.
Engineering Review Comments
Page 4 of 5
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 building/s, parking, and SWM detention can be built while maintaining
clean water diversions. Ensure diversions and all ESC can be maintained, as proposed, throughout
construction. Show proposed /possible internal access between SR 664 and construction site.
2. Label OP I, OP2.
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.
4. Concrete wash -out station must drain to a trapping device; show location of trapping device.
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).
6. Include ELS, culvert 3, in SWM narrative.
7. Label all culverts on this plan sheet.
8. Revise CE symbol at site entrance to PCE (paved entrance).
9. Provide additional existing contour labels, to aid review and analysis.
10. Show /label sanitary line (crossing) in culvert 5 profile (proposed san. line from building to septic field).
C-1.7
11. Provide specific OP details (OP I, OP2).
12. Provide standard VDOT details:
a. PB-1 (pipe bedding)
b. ST-1 (safety steps)
c. IS-1 (inlet shaping)
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 plan review staff are available from 2-4 PM on Thursdays, should you require a meeting to discuss this
review.
Processc
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 2-4 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.
Engineering Review Comments
Page 5 of 5
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;
hllp://www.albemarle.oriz/deptfonns.as]2?department--cdenoTo
WPO202000007_Hark Vineyards Tasting Room 031420