HomeMy WebLinkAboutWPO201800017 Review Comments WPO VSMP 2019-06-11Phone (434) 296-5832
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COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902-4596
VSMP Permit plan review
Project title: Lighthouse Instruments
Project file WP0201800017
number:
Fax (434) 972-4126
Plan preparer: Craig Kotarski [Craig.Kotarski@timmons.com]
Owner or rep.: Lighthouse Instruments: James Veale[jveale@lighthouseinstruments.com]
Plan received date: March 7, 2018
Sept. 14, 2018
Dec. 10, 2018
May 13, 2019
Date of comments: April 6, 2018 [Rev. 1 - Revised 4/19]
Oct. 15, 2018 [Rev. 2]
Jan. 14, 2018 [Rev. 3]
June 11, 2019 [Rev. 41
Reviewer: David James
[dj ames@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. 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. General
1. (Rev.2) Remove signature panel from cover sheet.
(Rev.3) Addressed.
(Rev.4) Not addressed.
B. 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. (Rev.1) Please complete item 12. Certification on the Registration Statement.
(Rev.2) Acknowledged.
2. (Rev.1) Insert copy of General Permit coverage when obtained.
(Rev.2) Acknowledged.
3. (Rev.1) There's impaired waters immediately downstream of site with a TMDL. Please
include this report in swppp:
httn://www.deo.virLinia.L-ov/FS2016/FactSheets.asnx?id=VAV-H28R MSCOIA00&stvle=l
(Rev.2) Addressed.
4. (Rev.1) Please complete section 9. Signed Certification & 10. Delegation (if needed).
Response: Sections will be completed by contractor before preconstruction meeting.
(Rev.2/3/4) Acknowledged.
5. (Rev.3) Submit (2) copies of the SWPPP with updated plans for sections 4, 5 & 6 of the
County's template.
(Rev.4) Addressed.
6. (Rev.3) Update Registration Statement under section 3 stating name/location of off -site activity.
(Rev.4) Fill out & submit the new DEQ Registration Statement.
B. Pollution Prevention Plan (PPP)
The PPP content requirements can be found in County Code section 17-404.
1. (Rev.1) Update the PPP with the ESC changes. Show proposed staging, stockpile, borrow,
fueling, waste disposal areas on the PPP.
(Rev.2) Addressed. Operator to update in the field as required.
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. (Rev.1) C0.0 - Add WPO number WPO201800017 to cover sheet title.
(Rev.2) Addressed.
2. (Rev.1) C2.0 - Show boundaries of existing predominant vegetation. Show areas of site to be
protected from disturbance. Identify/Label the adjacent rivers/streams that have impaired
water.
(Rev.2) Addressed.
3. (Rev.1) USACE to verify if any conservation areas (i.e. wetlands) exist at downstream location(s)
of proposed storm/sewer lines. Provide USACE permit prior to plan approval.
(Rev.2) Comment still valid. Also, Provide USACE permit for constructing proposed outlet in
stream. See comment C24 below.
(Rev.3) Comment still valid.
(Rev.4) See County Engineers' responses to the FDP201800019 and need for maintaining
riprap outfall. Permit required if improvements are below stream normal water level.
4. (Rev.1) Show & label the `Limits of Disturbance' to include all the clearing, grading,
excavating, transporting, and filling of land.
(Rev.2) Partially addressed. Include & show area past Matchline #2, shown on C4.0, on
the E&SC sheets in your LOD.
(Rev.3) Has the LOD area changed with the additional area added?
Response: The LOD net area has remained the same with the revision of the storm and
sanitary lines.
(Rev.4) Acknowledged.
5. (Rev.1) Show any areas outside of property line to be disturbed in an easement.
(Rev.2) Provide evidence that neighboring property owner is in agreement with this
offsite work in the easement or record an easement plat. This can be a letter of
agreement signed by neighboring property owner or record an easement plat. {DSM,
Sect. 8C, 3171
Response: Owner is currently acquiring easements and evidence will be provided before
plan approval.
(Rev.3/4) Acknowledged - comment still valid.
6. (Rev.1) Show proposed easements for drainage.
(Rev.2) A minimum 20' drainage easement will be needed for the drainage pipes
from VDOT right-of-way. The drainage easement width should follow the
calculation shown on pg. 15 of the DSM. Label easement as "Drainage Easement"
and "dedicated to public use". Easements shall be platted and recorded with deed
prior to final site plan approval.
(Rev.3) Addressed.
7. (Rev.1) Label the property line.
(Rev.2) Addressed.
8. (Rev.1) Show/Label location of floodplain/floodway limits.
(Rev.2) Addressed.
9. (Rev.1) Show/Label location of WPO buffer.
(Rev.2) Addressed.
10. (Rev.1) Show direction arrows for stormwater flow though pipes & flow paths onsite.
(Rev.2) Addressed.
11. (Rev.1) Show/Indicate approximate slopes after major grading activities.
(Rev.2) Acknowleged.
12 (De., i>
through pr-esefved slopes and ipAo the floodplain. 1 do not believe the use is pefmitted by ri&
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you
can elee to outside fpfese fyea slopes.
13. (Rev.1) Please submit a floodplain development application/plan to the county. A floodplain
development permit is required prior to floodplain disturbance.
(Rev.2) Acknowledged. Permit required prior to plan approval.
Response: Floodplain development application has been resubmitted along with this plan.
(Rev.3) Not address. As of 1-8-2019 the application has not been received.
(Rev.4) Addressed.
14. (Rev.1) You are disturbing land in the WPO buffer & floodplain. A mitigation plan is required.
(Rev.2) Addressed.
15. (Rev.1) Show existing & proposed land cover area maps.
(Rev.2) Not addressed.
(Rev.3) Addressed.
16. (Rev.1) Label constructed ditches/channels and show channel cross -sections (w/ slope & dims),
lining type, and engineering calcs.
(Rev.2) Addressed.
17. (Rev.1) Please correct/update the VRRM spreadsheet. You show 2.10ac managed turf pre-dev.
On the spreadsheet, but the plan shows 1.9ac forest/open space & 0.2ac turf.
(Rev.2) Please use the 2013 Stds & Specs VRRM version. There's 0.10ac forest/open space
post-dev. See comment C23.
(Rev.3) Addressed.
18. (Rev.1) Stormwater profiles - Add note to provide safety slabs (SL-1) in any structure taller than
12'. Add note to provide concrete inlet shaping (IS-1) for any structure with a 4' or greater drop.
(Rev.2) Addressed.
19. (Rev.2) Provide pipe anchors at every other joint for pipe 111 (>16% slope).
(Rev.3) Addressed, N/A.
20. (Rev.2) Show Tc and associated flow paths.
(Rev.3) Addressed.
21. (Rev.2) Show the 1% area map.
(Rev.3) Partially addressed. Show on the plan, or state the contributing DA at the point of
analysis. - map provided in calc packet.
(Rev.4) Addressed.
22. (Rev.2) Sheet C7.0 - Add note to provide 1/z" steel plate at the bottom of manhole structures
in "step-down" system (Str. 104 thru 112).
(Rev.3) Addressed.
23. (Rev.2) Show the forest/open space area to be protected in a `forest/open space easement'.
This area will need to be shown/recorded with a deed and plat prior to approval.
Consider protecting the additional forested space on the site in an easement to be dedicated
to offset the amount of nutrient credits needing to be purchased.
(Rev.3) Addressed.
24. (Rev.2) Provide detail of outlet design at stream. Profile should show rip -rap, stream bed, etc.
(Rev.3) Minimum standards (MS-12, MS-14, MS-15) must also be met. Show appropriate non -
erodible or armored controls & details (VAESC HB Spec. 3.22 thru 3.27) for disturbed area of
stream.
(Rev.4) See County Engineers' responses to the FDP201800019 and need for maintaining
riprap outfall. Permit required if improvements are below stream normal water level.
25. (Rev.2) Please contact Ana (akilmer&albemarle.org) regarding nutrient credit agreement. The
Owner Name, Project Name, WPO#, TMPs, # of phosphorous credits needed, and project's HUC
will all need to be provided.
(Rev.3) Acknowledged; currently 2.43 lbs credit required. - will followup with Ana on status.
(Rev.4) Nutrient credit agreement required prior to VMSP plan approval. Show Letter of
Availability from nutrient credit bank. Will send follow-up email to Ana.
26. (Rev.2) Design Calcs packet - Page 1 Project Narrative: The areas stated don't match the
plans/VRRM.
(Rev.3) Addressed.
27. (Rev.2) See Frank's email (10110118) regarding the relocation of the public drainage pipe
outfall location to reduce impact on preserved slopes and proposed retaining wall.
(Rev.3) Addressed.
28. (Rev.3) Design Calcs/Analysis: [Rev. May 10, 2019]
a. DI Str. 124 (LD229 / LD204 worksheets) DA & C value differs from what's shown in the
plans. (Rev.4) Not addressed.
b. Routing must use NOAA's precipitation data for the site (see email sent 11/29).
{9VAC25-870-72 Al
(Rev.4) LD-229 pipe design calls for 18" dia. for pipes 131 through 159. You're showing 15"
pipes in the profiles. The lengths are different for pipe 149. Pipe 169 not found in profiles.
Provide LD-268 calcs for the ditches.
LD-347 - Unable to locate inlet 170.
29. (Rev.3) LOA#1 - Overland flow from site may re -concentrate before reaching channel.
Provide some sort of permanent control measure (per email 11/29).
(Rev.4) Addressed.
30. (Rev.4) C6.0 - Confirm ditch section B-B detail side slope of 10:1 (Should be 4:1? Or
shown backwards?).
31. (Rev.4) You're 2410-yr flow rates reported for the ditches (C6.0) don't match the flows
reported in the HydroCAD routing.
32. (Rev.4) C6.1- You're pre-dev. (2.69 Ac) & post-dev. (2.57 Ac) DA totals don't match.
Account for the `undetained' area(s) of runoff post-dev.
33. (Rev.4) C7.0:
a. Show profile of ditch/channel and improvements to receiving stream (walls, EG-1,
transitions, pipe crossings).
b. Show profile of ditch to 130: DI-1.
D. Mitigation Plan (MP)
The mitigation plan requirements can be found in County Code Chapter 17-406.
(Mitigation plan not required anymore. Stormwater runoff now proposed to be directed to an
existing channel that is being improved)
„.
...........
-MI ''I" I III I 1 11
• •
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 approved. The erosion control plan content requirements can be found in County Code
section 17-402.
1. (Rev.1) C 1.0 —You're showing duplicate general construction notes. Please remove one.
(Rev.2) Not addressed.
(Rev.3) Addressed.
2. (Rev.1) C2.0 —
a. You're showing the steep slopes differently. Use the County's GIS overlay for steep
slopes.
(4119 SRC meeting follow-up) — If you are claiming slopes are less than 25% where the County's
GIS steep slopes are you must demonstrate better accuracy, based on newer survey data. Please
provide an exhibit sheet comparison of the site showing the county's steep slope overlay versus
your surveyed topo. Label/highlight areas you claim are less than 25% slope. Please have
licensed surveyor sign & date exhibit sheet. Frank Pohl, the county engineer, will make the final
determination.
(Rev.2) Sign seal; Need original signature.
(Rev.3) Addressed.
b. Ensure that all existing easements with deed book references, locations & dims are being
shown.
(Rev.2) Addressed.
3. (Rev.1) C3.2 —
a. You are showing DD symbols along the road ditchline, and they should be CD for check
dams & spaced according to the specs.
(Rev.2) Sheet C3.1 - Show CD details.
(Rev.3) Addressed.
b. Add baffle at the upper inlet sediment trap to prevent runoff shortcutting to the inlet.
(Rev.2) Addressed; N/A.
4. (Rev.1) C3.2/C3.3 Add OP symbol at outfall end of pipe & detail. Provide OP shape
& stone size calcs (see VADEQ ESC HB Spec. 3.18).
(Rev.2) Addressed.
5. (Rev.1) For grass stabilization on constructed slopes, the maximum steepness is 3:1.
Slopes steeper than 3:1 must be permanently stabilized with landscaping vegetation
hardier than grass, which will not require mowing [DSM].
(Rev.2) Partially addressed. Move seed mix spec from site plan to the E&SC plan.
Confirm if recommended seed mix doesn't conflict with permanent seed mix table
on sheet C3.1.
(Rev.3) Addressed.
6. (Rev.1) A building permit is required for walls. Please refer to the Building Official
[DSM].
(Rev.2) Acknowledged. See SDP201800070, SUB201800044 plan comments for the walls.
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;
http://www.albemarle.org/deptforms.asp?department--cdengmTo
File: WPO201800016_Lighthouse Instruments - VSMP -6-19 Rev[3].docx