HomeMy WebLinkAboutWPO202100033 Correspondence 2021-09-07 (2)BlaCkWellEngineering, PLC
566 East Market St. - Harrisonburg, Virginia 22801 - (540) 432.9555 - www.BtackwellEnginesring.wrn
9/3/2021
Emily Cox
Civil Engineer II
401 McIntire Road, North Wing
Charlottesville, VA
Response to County revision letter—TroxelI Poultry House
Dear Ms. Cox:
The following changes and/or clarifications have been made in response to your comment letter dated
8/26/2021. Please see our responses below in red.
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 use Albemarle county SWPPP template:
https://www.albemarle.org/home/showpublisheddocument/166/637202310327530000 Rev. 1:
Comment addressed.
2. Ensure registration statement and section 9, signed certification are signed. Rev. 1: Comment
addressed.
3. Rev. 1: Registration statement must be signed by the operator. Either the contractor
must sign it, or the owner who signed it must be listed as the operator. Rev. 2: Comment
not addressed.
The owner is now listed as the operator. A newly signed Registration statement has been
submitted.
B. Pollution Prevention Plan (PPP)
The PPP content requirements can be found in County Code section 17-404.
https://mcclibrary.blob.core.usgovcloudapi.net/codecontent/l2230/385730/Chapter%20
17%7nWatPr%7nPrntPrtinn ndf RPv 1 Comment addressed.
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. A stormwater management maintenance agreement must be recorded before this plan can be
approved. Please contact Ana Kilmer [akilmer@albemarle.org 434-296-5832 ext.3246] to
complete this process. Rev. 1: Comment not addressed. Rev. 2: Comment addressed.
2. Since forest & open space is being used in the VRRM, this area must be shown on a plat
labeled as SWM forest & open space and recorded with a deed before this plan can be
approved. There must also be an easement labeled SWIM Facility easement around the
proposed pond and its outfall and access area. The easement plat application can be found
here: https://www.albemarle.org/home/showdocument?id=1052 Rev. 1: Comment not
addressed. Rev. 2: Comment not addressed.
Open space areas have been changed since the last submittal and will be platted once
engineering changes have been tentatively approved.
3. Please add the following note to this plan and the plat mentioned in the above comment:
"The SWIM 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 desired vegetative community (but no more than
four times a year)" Rev. 1: Comment not addressed. Response letter said it was on sheet 2,
but it was not evident. Rev. 2: Comment addressed.
4. Please clarify where the 17.5 acres of forest & open space is located. The legend appear
incorrect on sheet 2. Rev. 1: Comment addressed, however, please label it as SWM forest &
open space easement. Rev. 2: Comment addressed.
5. Please add a title to sheet 1 and include WPO202100033 in the title. Rev. 1: Comment
addressed.
6. Professional seal should be signed and dated. Rev. 1: Comment addressed.
7. Please provide date the topographic information was obtained/survey was completed. Rev. 1:
Comment addressed.
8. Please show the WPO buffer and any critical slopes from county GIS on all applicable sheets.
Rev. 1: Comment addressed.
9. It would be helpful to have a grading and layout sheet separate from the E&S sheet. Rev. 1:
Comment addressed.
10. Please double check all grading and contour labels. The northern end of the site appears to
have 1 ft contours tying in to 2 ft contours. Also, the proposed contours do not match the labels
on the northwest side of the site. Rev. 1: Comment addressed.
12. Please label contour elevations on all applicable sheets, especially the drainage divides.
Rev. 1: Comment addressed.
13. Please list the required maintenance for the proposed SWIM pond on the plans. Rev. 1:
Comment addressed.
14. Please provide the following as -built check list on the plans:
https://www.albemarle.org/home/showpublisheddocument/3381/637327510536700000 Rev. 1:
Comment addressed.
15. On page 5 of your calculations packet, please clarify that you are meeting flood protection
by 9VAC25-870-66-C2B (it appears you were missing the Q. Rev. 1: Comment not addressed.
See below: Rev. 2: Comment addressed.
16. Please provide a detail for the emergency spillway for the permanent dry pond. Rev. 1:
Comment addressed.
17. Per 9VAC25-870-66-B, concentrated stormwater flow shall be released into a stormwater
conveyance system. The currently proposed outfall does not appear to go into a conveyance
system or channel. Rev. 1: Is this Ditch 1 in the calculations? Please clarify and ensure plan
view matches calculations. Plan view said swale cross section. DI's and culverts were
clearly labeled. Also, plan view contours do not appear to show a v-ditch or swale as
shown in calculations (or a channel). Contours below pipe outfall are shown below. A
14-1, — '' •--'--,;A-nt. If necessary, a site visit can be completed to verify the
Rev. 2: Comment addressed.
a area appears too IarnP It chnnld nnly ha tha r
:[UNUbrU UUL1dI1 NU111L. Irv. 2: Comment addre!
Rev. 2: Level spreader design and detail was not provided on Sheet 4. It should be shown
to scale on all sheets. It appears to be too steep downstream. It must meet this
specification: https:/Iswbmpvwrrc.wp.prod.es.cloud.vt.edu/wp-
content/uploads/2018/07/BMP Spec No 2 SHEET FLOW.pdf
Level Spreader is now located at the bottom of the hill where slope is shallower.
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.
11.. Jtd�t Piuviue uic Naveu �L PnuI vvd�JI IdLN ueLaii .._,n uic 11tlnailC county Design
Standards Manual (page 8): https://www.albemarle.org/Home/ShowDocument?id=270 Rev. 1:
Comment addressed.
2. Please show dust control as an E&S measure. Rev. 1: Comment addressed.
3. Please show a stockpile, staging and parking area. Rev. 1: Staging and parking area should
have perimeter controls. Rev. 2: Comment addressed.
4. Please provide adequate perimeter control, including silt fence around the southern and
eastern ends of the project. Rev. 1: See comment above. Rev. 2: Comment addressed.
5. Ensure Albemarle County Standard Notes are on the plan:
https://www.albemarle.org/home/showpublisheddocument/1262/637321325255330000 Rev. 1:
Comment addressed.
6. Provide details for the trash rack and anti -seep collars. Rev. 1: Ensure trash rack detail
specifies the anti -vortex. Rev. 2: Comment addressed.
7. Please clearly show the drainage area for the sediment basin as well as the required dry and
wet volume storages. Rev. 1: Volumes were not evident on the plan, elevations were shown.
Also show the freeboard on the detail as well as the embankment top width. Rev. 2:
Comment addressed.
8. Please add a note to the plans that County Inspector may require additional measures as
needed on site. Rev. 1: Comment addressed.
Thank you. Please let me know if you have any questions or need additional information during your
review.
Respectfully,
Brian Kinzie