HomeMy WebLinkAboutWPO201400099 Review Comments WPO VSMP 2016-08-31COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902-4596
Phone (434) 296-5832 Fax (434) 972-4126
Project title:
Project file number:
Plan preparer:
Owner or rep.:
Plan received date:
Date of comments:
Reviewers:
VSMP Permit plan review
Commonwealth Apartments
AT0201400099
Shimp Engineering
POSITIVE LLC
26 July 2016
31 August 2016
Max Greene
Uustin@shimp-engineering.com]
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. 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. Please have the property owner fill out and sign the registration Statement.
2. The Certification in Section #9 is not signed. The owner will need to sign the Certification.
B. Pollution Prevention Plan (PPP)
The PPP content requirements can be found in County Code section 17-404.
1. Item appears adequately addressed at this time.
C. 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. VRRMsMread sheet indicates 0.8 lbs. of credits will need to be purchased. Please contact Ana Kilmer
or information about nutrient credit purchasing documentation and requirements.
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 approved, 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. State DEQ requirements appear adequately addressed at this time.
Engineering Review Comments
Page 2 of 2
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;
hqp://www.albemarle.org/deptfonns.asp?department--cdengno
File: CDDE1_vsmp_Review Commonwealth Apartments_wpo201400099.doc
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: Commonwealth Office Building - WP0201400099
Plan preparer: Justin Shimp, Shimp Engineering [201 E Main St., Suite M, Charlottesville,
VA 22902-5273 - justinkshimp-en ing eerine com ]
Owner or rep.: Moores Creek Land LLC [P.O. Box 5384, Charlottesville, VA 22905]
Plan received date: 1 Dec 2014
Date of comments: 8 Jan 2015
Reviewer: John Anderson
County Code section 17-410 and Virginia Code §62.1-44.15:34 require 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. 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. Furnish SWPPP. SWPPP required as condition of General VPDES permit, but with area impact
<1.0 Ac., this project will not receive a state VPDES permit. Project is required, however, by
ordinance to submit VSMP Application, which includes a SWPPP [17-401.G.]. Please use
streamlined SWPPP template found at:
httD://www.albemarle.orQ/unload/imaees/forms center/departments/Community Develonment/forms/Engine
eringtand _WPO _Forms/Stormwater _Pollution _ Prevention_ Plan_SWPPP template.doc
B. Pollution Prevention Plan (PPP)
The PPP content requirements can be found in County Code section 17-404.
1. Provide PPP. If use County SWPPP template, should be addressed.
—see Sec. A. (SWPPP) above.
C. Stormwater Management Plan (WP0201400099)
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. Ref VDEQ BMP Clearinghouse for Level 2 bioretention basin technical specifications. VaRRM .xls
references bioretention #2 (6.b.) while design appears to reflect certain Level 1 specifications, including:
a. Treatment Vol. (T,) —CDA=6765sf; Rv, DA `B' =.7625, Tv =1.25*6765*.7625=12 =537cf. Revise
Tv.
b. Planting plan: A single 1" caliper tree is insufficient. Prepare a "planting template to include turf,
herbaceous vegetation, shrubs, and/or trees to achieve surface area coverage of at least 90% within
2 years. If using turf, must combine with other types of vegetation" [BMP spec]. Turf with a
single tree is an inadequate Level 2 planting plan (limited diversity).
2. Bioretention Level 2, additional:
Engineering Review Comments
Page 2 of 4
a. Provide observation well.
b. Provide schedule 40 PVC underdrain cleanout.
c. 15" DIA PVC standpipe top =494.3' which is >1.0' above bioretention invert =493.00'. Max, per
spec, 1'. Revise.
d. Sheet C811 —bioretention data table: provide L' x W' bioretention facility.
e. Sheet C811 —bioretention data table: surface area =276sf does not check against effective storage
depth =1.65', using either 429cf or 365cf. Confirm and show Level 2 bioretention surface area
calculation.
f. Include all relevant bioretention construction and maintenance notes found in Virginia DEQ
Stormwater Design Specification #9/Sections 8 and 9.
3. VaRRM/D.A. A. (Hydrologic report): Filterra does not route to a wet pond but to a 72" DIA pipe that does
not meet wet pond specifications. Underground pipe is a detention (not water quality) measure. Revise.
Do not route D.A. `A' runoff to BMP 13.a. practice (Wet pond #1), or claim 0.181b P removal —ref:
http://www.vwrrc.vt.edu/swc/documents/2013/1 DEO%20BMP%2OSpec%20No%2014_WET%20PONDS_Final%20D
raft _v 1-9_03 012011.pdf
4. Existing 48" RCP (Commonwealth Drive): Depict existing contours accurately. Inlet to pipe is obscured,
partially or completely.
5. Existing 48" RCP: Furnish notes that describe in detail: 1) how accumulated sediment at inlet will be
removed without release through the line, which may occur without care. Downstream properties will be
impacted if more than trace sediment passes through the 48" DIA pipe during restoration of capacity of this
line; and, 2) furnish structural design elements that restore hydraulic performance of this line while
reducing, as much as possible, long-term maintenance needs. This is not a public maintenance
responsibility —see item #5.
6. Existing 48" RCP: VDOT email (Troy Austin), Friday, May 24, 2013 9:47 AM (partial text):
"Basically, the pipe under the road and in the right of way will be maintained by VDOT to the extent that it
impacts the integrity of the road at this location. There should be a junction box on each side of the right
of way delineating the extent of VDOT's maintenance extents for the pipe (unless it is located within a
dedicated drainage easement). This situation needs to be investigated a little more to determine
absolutely whether or not this off-site pipe is a VDOT pipe but my suspicion is that it is not."
7. Hydrologic report: Please number report pages (this/future reports —hand-written pg # acceptable)
8. Hydrologic report: Furnish Drainage Map that shows DA -5, DA -2 —include labels for impervious/pervious,
consistent with VaRRM .xls. —see items #9-11
9. Report: Summary for SUBCATC14MENT 1, DA -2: 6,970 sf pervious area (VaRRM .xls) is inconsistent with
Report, 7,324 sf. Reconcile.
10. Report: Summary for SUBCATC14MENT 1, DA -2: 20,269 does not match storm inlet drain map, 20,447 sf.
Reconcile.
11. Report: Summary for SUBCATCHMENT 2, DA -5: 8,738 sf does not match storm inlet drain map, 8,774 sf.
Reconcile.
12. Report: pervious sidewalk runoff is shown reaching underground detention while bypassing Filterra unit.
This is not possible. Revise values, routings, and tables. Examine data carefully.
13. Report: Summary for SUBCATCHMENT 4, BYPASS: T, =19.1 minutes is unrealistic; revise/show calculations.
(this T, is unacceptable)
14. Report: LD -229 / STORM DRAIN DESIGN COMPUTATIONS: slope, Max. =16%. Revise pipe slopes >16%
(points 9-10; 10-11).
15. Report: LD -229 / STORM DRAIN DESIGN COMPUTATIONS: Include data, points 10 to 11.
16. C2, General: Publish critical slopes waiver; include with title sheet SP2013-00004 Conditions of Approval if
special permit included critical slopes waiver.
17. C3: Delete extraneous New Storm Filter label/leader line.
18. C3: Provide Filterra unit dimension labels.
Engineering Review Comments
Page 3 of 4
19. C3: Provide Filterra unit Mfr. sizing chart —correlate with CDA.
20. C3: Provide Storm Filter Mfr. sizing chart —correlate with CDA.
21. C4: Specify vegetative cover hardier than grass for grades steeper than 3:1.
22. C4: Provide underground detention system dimensions (116' X 72" DIA, s =0.005'/').
23. C4: Show/label DA -5, DA -2 drainage divides, correlate with hydrologic report/VaRRM .xls.
24. C5: STORM SEWER PROFILE: Show/label access to underground detention system.
25. C5: STORM SEWER PROFILE: Revise pipe slopes > 16%.
26. C5: STORM SEWER PROFILE: Dimension underground detention system.
27. C5: STORM SEWER PROFILE: Show Filterra connections to underground detention system.
28. C5: STORM SEWER PROFILE: Furnish safety slab for MH depth >12, if revised design requires.
D. Erosion and Sediment Control Plan (ESOP-WP0201400099)
Virginia Code §62.1-44.15:55 requires the VESCP authority to approve or disapprove an ESOP. 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.
Items 1-10/plan sheet C11:
1. Label Limits of Disturbance. (0.96 Ac.)
2. Show DC symbol, plan view. Dust control is listed in ESC Legend, but not shown on plans.
3. Provide depression (or ST) downslope of sharp bends in temp diversion, since these points are prone to
failure. (-ref. Pantops Corner project)
4. Revise DD plan view symbols to read DV, consistent with ESC legend.
5. Revise CE symbol, ESC legend, to read PCE, for paved construction entrance.
6. Provide L' X W' floor dimensions for sediment trap (ST).
7. Provide SAF between LOD and Trophy Chase Apartment complex parking lot.
8. Provide SF down slope of LOD/ST, upslope of drainage channel, to protect drainage way.
9. Show soil divide; label soil types.
10. Show ESC measures needed to support steps required to restore capacity of 48" DIA storm line.
11. C 12: Include detail for paved construction entrance with wash rack.
12. C12: Revise Elev. A, B, C, Sediment Trap Design Data (appear inaccurate).
13. C12: Ensure floor of ST is at least V higher than floor of bioretention.
14. C12: Furnish point 11 pipe exit velocity calc. Compare with OP design.
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.
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.
(The following 2 paragraphs may require clarification of DEQ database needs/balance of fees since disturbed area <1.0 Ac.)
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
Engineering Review Comments
Page 4 of 4
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;
http : //www. alb emarle. org/deptforms. asp? dep artment=c dengwp o
File: WPO201400099-Commonwealth Office VSMP-010815.doc