HomeMy WebLinkAboutWPO202200005 Review Comments WPO VSMP 2022-03-08f•� OF AL8
County of Albemarle
m COMMUNITY DEVELOPMENT DEPARTMENT
VSMP Permit Plan Review
Project title: Castalia Farm - New Facility
Project file number: WP0202200005
Plan preparer: Chris Marshall [chris@shimp-engineering.com]
Owner or rep.: Jodi Mills [jmills@stonypointdg.com]
Plan received date: Feb. 8, 2022
Date of comments: March 8, 2022
Reviewer: David James [djames2@albemarle.org]
401 McIntire Road, North Wing
Charlottesville, VA 22902-4579
Telephone: 434-296-5832
WWW.ALBEMARLE.ORG
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/approved.
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 ESCP, (3) a SWMP, and (4) any TMDL measures necessary.
1. Submit the rest of the SWPPP for review. Registration Statement received.
B. Pollution Prevention Plan (PPP)
The PPP content requirements can be found in County Code section 17-404.
1. Submit for review.
C. Stormwater Management Plan (SWMP)
VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a
SWMP. This plan is denied, 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. Include owner telephone & email contact information. [17-403]
2. Sheet C5, etc. - Bioretention #3 can be moved slightly to be outside of the buffer.
3. Sheet C8 - Show existing grade lines for each profile.
4. Det. Pond: Show number and spacing of barrel antiseep collars.
5. Bioretentions: (Ensure bioretention meets all requirements per DEQ specifications:
httDs://swbMDvwrrc.WD.Drod.es.cloud.vt.edu/wD-content/uploads/2017/11/BM P-SDec-
No-9 BIORETENTION v1-9 03012011.Ddf )
a. Ensure 2-ft minimum bottom to bedrock separation.
b. Ensure 2-ft minimum bottom to seasonal high water table separation.
c. Filter media: Please go with the 2011 standards on recommended bioretention
soil mix composition (Table 9.6). We have found that higher % of fines (clay
content) have caused issues with water filtrating though.
d. Filter media: Ensure an infiltration rate of 2 in/hr (min). Test will be required prior
to project termination.
Engineering Review Comments
Page 2 of 4
e. Show the underdrain (if used), cleanout and observation well locations on the
plans and profiles.
f. Provide sub -soil testing where underdrain is not used.
g. Provide required surface area (sq.ft).
h. Provide that the pretreatment SOD is approved as an acceptable form.
6. It appears that there is no concentrated runoff from the disturbed area to POA2 and
Water Quantity requirements do not apply. You would only need to size the culvert for
the upstream flow. Similar for culvert near entrance.
7. Include this checklist on the plan:
https://www.al bemarle.org/home/showpubl isheddocument/3381/6373275105367000
00
8. SWM packet: Show hatching legend for land cover maps.
9. Provide letter of availability from nutrient source provider. 0.91 TP credits currently
required according to VRRM.
10. Coordinated nutrient credit agreement with Ana akilmer(aalbemarle.org prior to
purchase. Purchase of credits will be needed prior to bond request.
D. Mitigation Plan (MP)
The mitigation plan requirements can be found in County Code Chapter 17-406.
1. Submit a mitigation plan for proposed disturbance in the stream buffers.
2. Provide culvert calcs and size them to pass the 25-yr storm.
3. For crossings of perennial streams, bridges, arch culverts, or box culverts shall be used.
4. The stream crossing shall not disturb more than 301-ft. It appears you exceed this
amount at the second crossing.
5. Add note to mitigation plan that stream bed and banks shall be stabilized within (7) days
from start of backfilling and to notify inspector.
6. Provide copy of approved permit from USACE for the stream crossings.
7. Show the design for a single stream crossing. Provide justification for two stream
crossings. [17-604 C][17-406 A.3]
E. 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, 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. Cover: Provide dates) when site boundary and topography survey was performed.
2. Show VDOT entrance type. VDOT entrance permit will need to be obtained prior to
permit issuance.
3. Sheet C10/11-
a. Show existing drainage divides.
b. Show SC (VAESC HB, Spec. 3.24) for the stream crossings.
c. Provide VSS, SSS (VAESC HB, Spec. 3.22, 3.23) as necessary.
d. Tie-in proposed grading for traps.
e. Show drainage area to diversions (Sac max).
f. Ensure channel diversion directional change is not too severe & greater than 90
degrees. Energy dissipation check dams can be implemented.
4. Sheet C12, etc. -
Engineering Review Comments
Page 3 of 4
a. Conversion to permanent facility/ BMP shall not occur until the road and all
upstream drainage areas are fully stabilized. This would be after #12 in the phase
2 sequence.
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Show SF here & provide B/M on slope:
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5. Sheet C12 should still be showing ESC sediment traps and not the permanent SWM
features in place.
6. Provide the liner type requirement for the channel conveyances.
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, erosion and sediment control and stormwater management improvements must
be bonded. The bonding process begins when the plan is approved, and the applicant submits a
bond estimate request form and fee to the Department of Community Development. A plan
reviewer 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 to the
County, who will record the agreement.
After bonding and agreements are complete, county staff enters project information in a DEQ
database for state application processing, if a DEQ permit is required. DEQ reviews the
application information based on local VSMP authority approval. At this time, the DEQ portion of
Engineering Review Comments
Page 4 of 4
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, which must be posted at the construction site.
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;
https://www.al bemarle.org/government/com munity-development/apply-for/engineering-applications