HomeMy WebLinkAboutWPO201900047 Review Comments WPO VSMP 2019-10-02COUNTY 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 date:
Plan date:
(Rev 1)
Plan received date:
Plan received date:
(Rev. 1)
Date of comments:
Date of comments:
(Rev. 1)
Reviewer:
VSMP Permit Plan Review
Hampton Inn VSMP
WP0201900047
Bohler Engineering
PT Hotel, LLC
August 2, 2019
September 11, 2019
August 14, 2019
September 16, 2019
VA@BohlerEng.com
August 27, 2019
September 25, 2019 /rev. 2-Oct 2019/Alb. County
WW Associates, Inc.
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 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. Registration Statement:
a. Section IV E states that the discharge is to an MS4. This appear correct for program compliance
purposes since project is located within Alb. County MS4 boundary.
b. Section IV F requires the provision of a 61 order HUC. Please provide the 12-digit code, or the 2-
letter, 2-digit number code.
c. Section VI: the Certification must be signed and dated.
2. Provide the Notice of Permit Coverage, once issued.
B. Pollution Prevention Plan (PPP)
The PPP content requirements can be found in County Code section 17-404. This plan is disapproved.
1. Please provide an I I" x 17" plan sheet that shows the second construction entrance, with settling pit for
washdown.
2. Show fueling in Table C of Section 6.
3. Provide the responsible person prior to Grading Permit issuance.
4. Revise Section F. to comply with 9VAC25-880-70, Part II, section A.4.e.
5. Revise Section G to comply with 9VAC25-880-70, Part 11, section A.41. This requirement is focused on
training personnel, not the construction or inspection/duties of personnel.
6. Section 7 states that bacteria are a TMDL basis for the Rivanna River. State here the measures that will be
taken to ensure that fecal coliform bacteria do not leave the site.
Engineering Review Comments
Page 2 of 5
7. Section 8: Qualified Personnel must be identified prior to Grading Permit issuance. (VSMP /WPO Plan
must be approved prior to approval of the Final Site Plan /FSP.)
8. Section 9: The signed certification must be submitted prior to Grading Permit issuance.
9. Section 10: The Delegation of Authority should be provided prior to Grading Permit issuance.
10. Provide a legend for the hashmark symbols used in the port -a John, dumpster, fuel pan and materials
stockpile areas.
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. Nutrient must be purchased before final VSMP plan approval. Section 17-502 provides the requirements
for acquisition of offsite nutrient credits. Provide required documentation for purchased credits. Please
coordinate with Ana Kilmer (434.296-5832-x3246) prior to purchase, else purchase documents may
require revision.
2. Provide a maintenance and inspection schedule for the permanent stormwater control practices, detention
and isolator row. Also, items 6 and 13, below.
3. Coordinate a stormwater control maintenance agreement with Ana Kilmer as soon as possible. Agreement
is required under 17-415, and is prerequisite to both Grading Permit and FSP approval.
4. Stormwater conveyance piping sizes not specified. Provide for review. (VDOT LD-204; LD-229)
5. Show pre- and post -development Tc calculations.
6. The Isolator Row is a Practice 17 filtering device. Please correct the VRRM spreadsheet, line 14b. Also,
include with plans pg. 34-37 (portion of O&M Manual) of .PDF file at: https://www.swbmp.vwrrc.vt.edu/wp-
content/uploads/2017/10/Filter Application StormTech-Isolator-Row Item-l.pdf#page=34 ).
New: (10/2/19)
7. Recommend project site area and limits of disturbance be listed on C0.0.
8. Since storm runoff releases to a natural conveyance downslope of pipe outfall, compliance requires energy
balance, which is provided. Given this, channel protection analysis is complete at riprap section at outfall.
No need to evaluate at P0I-1, or discuss P0I-1. Likewise, recommend revise SWM Narrative to reflect
flood protection is met using 9VAC25-870-66.C.2.b, in which case, POI -A analysis is not required.
9. C-900: Water Quality BMP Analysis makes ref. to Isolator Row. Provide isolator row plan /profile details,
as well as installation details for this stormwater quality -related BMP. Plan -profile -details required for
adequate installation, and construction inspection.
C-901
10. Stormwater Detention System — Outlet Structure Detail: If this is (sheet C-202) Str. STM A-30 revise detail
caption to clarify this is the case (if outlet structure detail is STM A-20, please revise detail to clarify).
Also:
a. Low flow orifice < 3" DIA is prone to blockage. Engineering requires 3" Min orifice diameter.
Revise weir plate design, detention system design, and routings, as needed.
b. Provide weir plate data: material, gauge, connection to MH wall (pre -fabricated /field -built, etc.)
c. Ensure weir plate connection with MH /outlet structure is watertight. Provide notes
/specifications, as needed.
d. Provide low -flow orifice trash rack, and detail.
e. Label critical elevations of 45" StormTech ® MC-3500 detention system profile. For example:
underdrain, stone chamber beneath system, top of chamber, final grade, etc.
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Page 3 of 5
11. Operation of bypass is unclear. Provide plan /profile design information for bypass /bypass structures.
Clarify whether weir plate is located in STM A-20 or A-30. Clarify location and elevations of bypass
pipes. Show bypass pipes in profile. Provide schematic detail aligned /consistent with C-203 Sequence,
Phase I, Note 7, where bypass pipes are introduced. Explain how permanent bypass of a portion of post -
developed storm runoff works. Clarify post -developed bypass runoff via narrative and schematic detail.
12. Consolidate SWM details, as much as possible. For example, only plan -view schematic of StormTech
system is an outline of the system on C-202, which is insufficient. Include plan -view of detention system
on SWM plan sheet, rather than ESC plan sheet. Label overall L X W of detention system.
13. It is unclear after reviewing plan and technical information whether the entire extent of the MC-3500
system is an isolator row, or if only a portion is. Clarify using linework, notes, labels, etc., extent and
location of isolator row. Ensure plan provides sufficient detail to guide installation of inspection ports,
non -woven fabric, etc.
14. Provide calculation using L X W of StormTech system to show VaRRM.xls required volume is provided:
5,842.49 FT 3.
D. Erosion and Sediment Control Plan (ESOP)
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.
1. Intentionally blank
2. Provide the name of the certified land disturber. Also Sec. B., above, PPP.
3. A waiver is required for the proposed disturbance within the critical slope area. Please provide evidence
that a waiver has been obtained for this disturbance.
New: (10/2/19)
C-201
4. Remove silt fence unless parallel with contours.
5. Provide alternative ESC measures for SF removed at item 4; DD, for example.
6. Label floor dimensions of sediment trap. Label ST weir dimensions. (Also, item 22, below).
7. DA upslope of silt fence may not exceed 100', which appears to be the case at the N corner of LOD.
Revise SF design consistent with VESCH, 3rd Edit, 1992.
8. Revise CE label to read PCE. VA Uniform Coding System legend is fine, but project requires a paved
construction entrance. Revise Legend to include Mulch (MU). Revise sheet C-202, as well.
C-202:
9. Note: PE -sealed geotechnical retaining wall design is required for Site Plan approval.
10. Show /label SWM Facility Easement (detention /isolator row). Provide SWM Facility Access Easement
that extends to public RW (State Farm Blvd).
11. Provide, show and label public drainage easement for permanent stormwater conveyance downstream of
detention system.
12. Submit easement plat application for items listed at 10 and 11, above. Ensure easement width for detention
system conforms with drainage easement diagram at ACDSM, p. 15; link to Design Manual:
http://www.albemarle.org,/upload/images/forms_center/departments/community development/forms/design
_standards _manual/Albemarle _Com1y Design Standards _Manual _2015-04-25_draft.pdf
13. Note: Recorded deed of easement (deed /plat) is required prior to VSMP /WPO plan approval.
14. Dimension riprap (L X W X D) at storm pipe outfall near west corner of site.
15. Add labels that correlate this sheet with C-203, VII, Sequence, Phase I, Note 7., bypass pipes (proposed and
Engineering Review Comments
Page 4 of 5
existing 2 1 " bypass).
C-203
16. Sequence of Construction, Phase I, Note 7: Label 2 1 " RCP pipe on C-202.
17. Include county Construction Record Drawing (As -built) policy on VSMP plan; link to policy:
hqp://www.albemarle.orgLupload/images/forms center/departments/Community Development/fonns/En ingi eering_and
_WPO_Forms/WPO_VSMP _Construction _ Record Drawings Policy 23May2014.pdf
18. Provide /include manufacturer -specific installation and periodic inspection guidelines on the plan. Also,
comment at C.6., above.
19. Provide additional sequence /text description of transition from Phase I to Phase II, especially measures
required once sediment trap is removed, but before site is stabilized and detention system is on-line.
20. Provide additional sequence that details how /when detention system is brought on-line, relative to site
stabilization.
C-204:
21. Include VDOT standard details, including: ST-1, IS-1, MH-1.
22. Show sediment trap floor dimensions on C-201 (Also, item 61 above).
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 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.
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;
Engineering Review Comments
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http://www.albemarle.org/deptforms.asp?department--cdengMo
WPO201900047 Hampton Inn Rev 1 092519ww assoc 100219albco rev