HomeMy WebLinkAboutWPO201700075 Approval - County 2018-12-14COUNTY 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 title:
Crozet Court
Project file number:
WP0201700075
Plan preparer:
Shimp Engineering
Owner or rep.:
Stony Point Design/Build LLC
Chris Henry
Plan received date:
15 November 2017
(Rev. 1)
24 May 2018
(Rev. 2)
6 Aug 2018
(Rev. 3)
7 Sep 2018
(Rev. 4)
7 Dec 2018 (.PDF)
Date of comments:
15 December 2017
(Rev. 1)
6 July 2018
(Rev. 2)
28 Aug 2018
(Rev. 3)
19 Sep 2018
(Rev. 4)
14 Dec 2018 —Approved
Reviewers:
Matt Wentland
J. Anderson (Rev. 2, 3, 4)
b ustin@shimp-engineering. c om]
[chenry@stonypointdb. 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 approved.
* Note: Minor edit required before printing (ref. JA email, 12/14/2018 2:31 PM).
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. The SWPPP appears to be acceptable at this time.
B. Pollution Prevention Plan (PPP)
The PPP content requirements can be found in County Code section 17-404.
1. The PPP appears to be acceptable 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 approved.
Any Forest and Open Space used in the VRRM worksheet as a Post -Development land cover will need to
be shown on the plans and labelled as'SWM Forest and Open Space'. The following note will need to be
placed on the plan:
"The SWM Forest and Open Space Easement is subject to the guidance set forth by DEQ in the Virginia
Stormwater Management Program. The areas will remain undisturbed in a natural, vegetated state, except
for activities as approved by the local program authority, such as forest management, control of invasive
species, replanting and revegetating, passive recreation (e.g., trails), and limited bush hogging to maintain
Engineering Review Comments
Page 2 of 4
desired vegetative community (but no more than four times a year)."
If the Forest and Open Space is not needed to reach compliance, the undisturbed portion can be removed
from the worksheet. (Rev. 1) Partially addressed. As follow-up:
• Provide conventional label on sheet C-3; cut/paste label may become detached. (Rev. 2)
Addressed.
• Provide boundaries to define 1.62 Ac. SWM Forest and Open Space easement. (Rev. 2)
Addressed.
• Provide scan image of Circuit Court receipt of recordation of Deed of Dedication of SWM Forest
and Open Space Easement, prior to VSMP plan approval. (Rev. 2) Addressed. Applicant correctly
states SWM Forest /Open Space easement may be recorded on the subdivision plat, and is not required
for VSMP approval. This comment is revised to request VSMP-related easements be recorded with
subdivision plat.
It is not clear how the flow from the 15" CMP under Claudius Ct. next to the proposed entrance will reach
the inlet on Lot 17. Provide more detailed grading in this area to verify the neighboring property will be
unaffected by the Jamestown Road construction. (Rev. 1) Not addressed. At issue: existing contours
divert storm runoff away from Block A, Sec. 2, Lot 5 (Ralston) parcel located at the northwest corner of Int.
Claudius Ct. and (proposed) Jamestown Rd. Proposed drainage does not accommodate disturbance to pre -
development runoff patterns. If Jamestown Road is constructed without drainage designed to capture and
convey off -site /bypass runoff from Ex. 15" CMP (beneath Claudius Ct.; runoff transits Ralston parcel but
briefly before turning SW under existing conditions), post -developed storm runoff will trek west along /on
the Ralston parcel, which is an adverse impact. Provide drainage to attenuate post -development impact to
this parcel. Provide pipe convey as condition of VSMP /Road Plan approval. (Rev. 2) Addressed. As
follow-up: Discussed in Engineering plan review meeting on 7/12 (pipe is not mandatory; see Ditch 4A).
Further, design engineer met with property owner (D. Ralston) on -site, 8/21 (ref. D. Ralston email:
8/21/2018 11:50 PM). Engineering follow-up email: `Ensure Notes on ROAD /VSMP-WPO plans clarify
tree preservation measures, berm installation, etc.' (8/22/2018 11:38 AM). (Rev. 3) Partially addressed.
Asfollow-up: Revise ditch section table, Ditch 4A, to show 2.5:1 sideslope. (Avoid slopes steeper than
2.5:1 at this location, to be maintained as grass.) (Rev. 4) Comment withdrawn, review error (discussed
11/15/18).
EC-2
4A
Matting
1.0
0.91
5
2;1
4B
EC-2
Matting
1.0
0.87
8
4:1
3. Show easements on all the proposed aiicncs and pipes. (Rev. 1) Partially addressed. As follow-up:
Provide SWM Facility Easement label in vicinity of BMP B pretreatment cell; easement is not clearly
continuous between 12' SWM Facility Access for BMP practice B, and BMP practice B. Recommend
review easement line -work and provide additional labels that more clearly identify easements. (Rev. 2)
Addressed.
4. Provide Deed Book references or copies of signed agreements for any off -site construction easements (such
as on the 960 Claudius Ct. property). (Rev. 1) Addressed. Applicant response: No offsite construction is
proposed.
5. It doesn't appear the BMP B facility access will work as shown due to it passing over outlet D1. The access
to the BMPs should also be a minimum of 12' wide. (Rev. 1) Addressed.
6. Specify the surface cover of the BMPs (such as turf or mulch). (Rev. 1) Partially addressed. As ollow-
yR: In addition to listing hardwood mulch in narrative, label BMP surface cover in BMP profile details,
C14. (Rev. 2) Addressed.
7. Provide access points to the 60" HDPE at B1, C1, and the weir. (Rev. 1) Addressed. 60" HDPE has been
replaced. Asfollow-up: With redesigned pretreatment, provide detailed location information for 22' X 3'
and 17' X 3' timber /gravel level spreaders (BMP detail: Biofilter A pretreatment). Location is ambiguous.
(Rev. 2) Addressed.
8. The 60" HDPE does not appear to count as a pre-treatment cell as it is not providing any filtering of the
sediment before it reaches the biofilter. Please choose a measure from section 6.4 of DEQ Specification No.
9 Bioretention to ensure that two measures are provided. (Rev. 1) Addressed.
9. Remove the sanitary sewer from beneath the biofilter. This has the potential to cause maintenance issues in
the future as the ACSA would not normally repair the biofilter if there is a need to repair/replace the
Engineering Review Comments
Page 3 of 4
sanitary line. The sanitary line can remain if the ACSA agrees to repair the biofilter in the case of
disturbances caused by any sewer repairs. (Rev. 1) Addressed. Applicant response: Sanitary sewer no
longer passes under biofilter.
New
10. Surface Area (SA) of biofilters (filter beds) appears insufficient for both bioretention practices, based upon
depth of media, stone, ponding, void ratios, and VRRM .xls Tv for each Level 1 bioretention practice.
Please see Eq. 9.3, p. 17 of VA DEQ Stomrwater Design Specification No. 9. SA BMP A should be
>2,269 ft2; SA BMP B should be >3,302 ft2. Please provide SA that meets specification. (Rev. 2)
Comment withdrawn. Review error.
11. C3, C4, C5 sheet titles reference Road Plans —revise to reference VSMP Plan. (Rev. 2) Addressed. As
follow-up, please reverse order of plan sheets C12, C13. (Rev. 3) Applicant may restore original order of
sheets, and revise index to reflect original order of plan sheets. Comment only intended to point out that
sheets were arranged out of order during plan set assembly. Original order was logical, and made sense.
(Rev. 4) Addressed.
12. C12: Revise permanent stormwater management Note 3 to include and require County ESC inspector
approval prior to removing ESC measures. (Rev. 2) Addressed.
13. C 11: Root wad bank stabilization: show on plans how many, spacing, and locations of this stream
restoration measure. (Rev. 2) Addressed.
14. 5/21/18 Applicant response references sheet C12 channel restoration plan. Show and label (recommend
legend symbol) those sections of channel to be restored for mitigation credit. Provide evidence of Corps of
Engineers coordination and USACE acceptance of mitigation plan, if U.S. Army Corps is involved. (Rev.
2) Partially Addressed. Applicant response: `USAGE will not be involved [?] because we are permitted to
disturb less than 3001f of stream under the Nationwide 18 permit.' Please send .PDF of NWP-18 issued to
this project to affirm permit acquired. (Rev. 3) Not Addressed. Provide copy of project -specific NW-18
permit. Also see email sent: 9/18/2018 4:50 PM (request to provide copy of NW-18 permit) (Rev. 4)
Addressed. USACE email (December 07, 2018 6:53 AM): "It appears your project falls under the NWP
18 non reporting requirements. If your project changes, please contact my office."
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.
The notes on sheet C8 state that storm sewer B and C will flow into the trap until the 60" HDPE is installed
and that the 60" HDPE is not to be installed until the trap is removed. Please provide more detail as to
where the flow from B and C will be directed during the trap removal/60" HDPE installation. (Rev. 1)
Partially addressed. Note, C8, states that (proposed) storm sewers shall drain to trap until manhole is
installed. As follow-up: Confirm and provide supportive calculation showing trap is designed to
accommodate concentrated storm drain flow from area/s captured and conveyed by storm drains. (Rev. 2)
Addressed.
E. Mitigation Plan
* Note: Minor edit required before printing (ref. JA email, 12/14/2018 2:31 PM).
1. It appears that the number of plantings shown on the plans is based off of the disturbed area and not the 2:1
ratio. (Rev. 1) Partially addressed. As follow-up: Mitigation Landscape Table lists 270 plants total, while text
immediately beneath buffer planting instructions references 495 tree whips planted... Please note large canopy trees
are not whips. 45 large caliper canopy trees are required. 90 understory trees are required. 135 shrubs are required.
The total 270 is incorrect. If sum quantities in the table, total =407. Revise text, table, and totals for clarity. (Rev.
2) Partially addressed. As follow-up: C9 references 1,210 /Ac. planting requirement. With 0.82 Ac. stream buffer
impact, and 2:1 offset requirement, plant requirement = 0.82 X 2 X 1,210 =1,984 plants. Revise reference to 990
plants to the correct quantity, 1,984. Also, if 34,380 ft2 of buffer is available for seedling plants on 8' X 8' centers,
then 34,380 ft2 - 64 ft2 = 537 (plants). Please revise Landscape Schedule table to provide 537 mixed species plants.
(Rev. 3) Not addressed. Option C. requires 1,210 whips /Ac. to be planted; 600 /Ac. to survive after two growing
Engineering Review Comments
Page 4 of 4
seasons. Review error lists 8' x 8' centers. Option C requires 6' x 6' centers, meaning 34,380 ft2 - 36 ft2 = 955
(plants). Please revise Landscape Schedule table to provide 955 mixed species plants. (Rev. 4) Addressed. Plan
sheet C9 provides 575 container -grown seedlings to be planted on 8 x 8 centers.
Link: https://townhall.vir ig nia.gov/L/GetFile.cftn?File=GuidanceDocs%5C440%5CGDoc DEO 5415 vl.pdf
C. If the applicant is willing to enter into a five year maintenance and performance guarantee:
100% ofbuffer planted with:
Bare root seedlings or whips at 1,210 per acre, approximat y 6'x 6' on center (Minimum
survival required after two growing seasons: 600 plants)
or
Container grown seedling tubes at 700 per acre approximately 8'x 8' on center (Minimum
survival required after two growing seasons: 490 plants)
Please submit four (4) full-size copies of the VSMP plan and two (2) sets of revised I I" x 17" ESC Plan, SWM
Plan, Mitigation Plan (SWPPP inserts), for stamped approval. Final print submittal does not require an application,
and should be addressed to J. Anderson, marked `For Approval.'
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;
httn: //www. albemarle. ore/dentforms. asp? department=cdenz"o
Thank you
J. Anderson 434.296-5832 —x3069
WP0201700075 Crozet Court 121418 rev4 Approval.doc