HomeMy WebLinkAboutWPO202200032 Review Comments WPO VSMP 2022-08-25�q off nig 401 McIntire Road, North Wing
Charlottesville, VA 22902-4579
County of Albemarle Telephone: 434-296-5832
COMMUNITY DEVELOPMENT DEPARTMENT WWW.ALBEMARLE.ORG
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VSMP Permit Plan Review
Project title: Berkmar Self Storage VSMP
Project file number: WPO2022-00032
Plan preparer: Jessica Denko, PE / Timmons Group [ Jessica.denko(Ltimmons.coml
608 Preston Ave., Suite 200 / Charlottesville, VA 22903
Owner or rep.: Berkmar Holdings, LLC — Frank Stoner[fstoner(a),milestonepartners.com ]
411 East Franklin Street, Suite 400
Richmond, VA 23219
Plan received date: 19 Jul 2022
Date of comments: 25 Aug 2022
Reviewer: John Anderson, PE, CFM
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 disapproved for reasons listed 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.
SWPPP
1. Revise SWPPP cover to include ref. to WP0202200032.
2. Registration Statement, SWPPP Sec. 1
a. Sec. IA and Sec. V of Registration Statement are the same entity. If Sec. IA is TBL, then
statement should remain unsigned until Construction Activity Operator is named Aisted.
b. Sec. IB: Once Construction Activity Operator named /listed, please include valid email.
c. Sec. III, off -site support activity: If anticipate off -site disposal, please complete this section.
3. Sec. 4/5: Update once ESC /SWM plan sheets revised.
4. Sec. 6.A.: SWPPP Exhibit (I I" x 17"), update as needed.
5. Sec. 6.E.: List named individual responsible for PPP. Not required for plan approval but required to
receive a grading permit.
6. Sec. 8: List named individual responsible for VESCH /SWPPP compliance inspections. Not required for
plan approval but required to receive a grading permit
7. Sec. 9: Signed Certification: complete /required prior to plan approval.
B. Pollution Prevention Plan (PPP) — See above items 4, 5.
The PPP content requirements can be found in County Code section 17-404.
C. Stormwater Management Plan (SWMP)
VSMP Regulation 9VAC25-870-108 requires the VSMP authority to approve or disapprove a SWMP. This
plan is disapproved for reasons listed below. The stormwater management plan content requirements can be
found in County Code section 17-403.
1. C0.0
a. Revise plan set title to include ref. to VR0202200032.
Engineering Review Comments
Page 2 of 6
b. List associated (off -site) SDP-WPO plans, including:
i. WPO201800030, Charlottesville -Albemarle SPCA
ii. W 0201600011, Harvest Moon
iii. WPO201600011, Kegler's Pond As -built
iv. WPO201100076, Rivanna Plaza
v. Rivanna Plaza easement plat @ DB-PG 3839-301
vi. SDP199500087, Lowe's Home Improvement Center (Calculations /approved site plan)
vii. SDP200300102, Lowe's Minor Amendment
2. C6.2
a. Revise capacity of pipe 127 such that Q provided > Q required (24.466cfs v. 38.16cfs).
3. C6.3
a. Revise Calculations (7/15/22), SWPPP, and plan to reference:
i. Existing dry detention basin, SWM facility ID 0021.01 rather than `Keglers Regional
Pond' since Kegler's is not a regional pond within regulatory meaning of the definition,
but rather a typical SWM facility immediately adjacent to development areas which drain
to it. Many developments drain to it, but it was constructed primarily to serve Kegler's
(bowling alley) and Lowe's 30 years ago. As development has progressed along Berkmar
(Harvest Moon, UVA Credit Union, ACSPCA /improvements pending, Berkmar
Overlook, now Berkmar Self -Storage /hotel), reliance on the small detention basin is a
proposition Engineering evaluates with care since the Ex. detention basin is not a
`regional' facility. VAC states: "A locality's VSMP authority may develop
comprehensive storrnwater management plans to be approved by the department [DEQ]
that meet the water quality objectives, quantity objectives, or both of this chapter."
(9VAC25-870-92). 9VAC25-870-69 outlines offsite compliance options that a VSMP
authority may allow an operator to use to meet required phosphorus nutrient reductions,
including "Offsite controls utilized in accordance with a comprehensive stormwater
management plan adopted pursuant to 9VAC25-870-92 for the local watershed within
which a project is located." The small detention basin was not developed by Albemarle
as a regional SWM facility —it is simply a detention basin.
b. Include supplemental narrative in Calc. packet:
i. Please state: "Albemarle SWM facility database states existing dry detention basin
watershed is 61.87 Ac. with 21.37 Ac. impervious. Plan approval date is 11/19/87.
Facility is listed in county SWM database (co -owned by) Keglers of Charlottesville and
Lowes Investment Corp #34I" Proposed development, Berkmar Self -Storage, appears to
lack ownership in the facility, or privilege to use it. Applicant parcel is not child to
parent subdivision that might assign use rights to Applicant. Applicant should coordinate
/execute notarized Agreement with owner to use the existing dry detention basin, and
furnish copy to Albemarle. Albemarle would not be party to this Agreement, but relies
on prior -recorded instruments —see item iii. If Applicant is aware of an implicit right to
rely upon the existing dry detention basin exists (via recorded instrument), please advise
Engineering so we may forward document/s to county attorney's office for their review.
ii. Add Note ref. to: Deed of Easement (establishes right of County to Maintain), DB-PG:
1786-0734,recorded 2/9/99.
iii. Add Note ref. to: Detention Pond Easement Plat, DB-PG: 1786-0737, plat by Wiley &
Wilson, Lynchburg, April 15, 1994.
iv. Add Note ref. to: County of Albemarle deed of easement with Keglers of Charlottesville
item iii, above).
c. Revise ex. detention basin detail rim of riser label to read 471.0 rather than 417.0.
Engineering Review Comments
Page 3 of 6
4. Calculation packet /Additional:
a. Revise title /cover of calc. packet to ref. to WPO202200032.
b. Please review, compare (with calcs), and incorporate, as needed:
i. SDP200300102 Lowe's Home Centers Inc. Minor Amendment, and
ii. SDP199500087 Lowe's Calculations and Approved plan in Berkmar Self -Storage
evaluation of ex. detention basin (design, parameters, As -built volume /structures,
routings, etc.), and revise design /calculations, as needed.
Note: Albemarle sent link to files /plans: County Engineer (Frank Pohl) to Timmons
Group (C. Kotarski) and Milestone Partners (Frank Stoner), Sep. 28, 2021, 4:30 PM.
c. Separate post-DEV offsite drainage areas into discrete areas since CN / Tc differ for off -site DAs.
i. To, Berkmar Overlook residential development, for example, C6.1 should be routed with
Tc=7.2min, not 20.5min, as appears to be the case on pg. 25 of calc. packet. Please route
offsite Areas A, B, C as distinct separate DAs in HydroCAD pre- /post-DEV routings.
ii. Specifically, the following (see C6.1) should route as sub -catchments, not a weighted Tc
/CN, single, off -site contributing DA to the dry detention basin:
1. DA Area_A (S of Berkmar Overlook Development): 36.6 Ac, CN =70, Tc
=20.5min
2. 36.6 DA: Delineate developed v. undeveloped, route developed areas and one
undeveloped area to obtain a composite pre- /post-DEV (pre- /post, identical)
peak flow for each inlet discharging to the basin:
a. Developed parcels NW of Int. Woodbrook Drive Berkmar Drive.
b. Charlottesville -Albemarle SPCA
c. Harvest Moon
d. UVA credit union
e. Undeveloped
Note: At first glance, SPCA, Credit Union and Harvest Moon appear to
have high CN Aow To, and may be anticipated to deliver peak flow
rates nearly simultaneously. Also, pre- /post-DEV rates for all off -site
areas will be identical, since not affected by Berkmar Self -Storage
Engineering Review Comments
Page 4 of 6
development, but it is important to discriminate between off -site
developed v. undeveloped areas as was done for Berkmar Overlook.
Timmons Group likely has reliable post-dev H&H data for ACSPCA
(WPO201800030), having prepared the design.
3. Route Lowe's to basin, along with areas discussed in items 4.c.ii. L-2. above.
4. Route Kegler's (bowling alley) to basin, along with 1,2,3.
5. Route Rivanna Plaza to basin, along with 1. 4.
Note: Engineering does not use /run HydroCAD, we comment on methodology.
6. DA B (Berkmar Overlook development): 6.78 Ac., CN =80.9, Tc=7.2min.
7. DA C (Berkmar Overlook development): 0.90 Ac., CN =65.8, Tc -6min.
iii. Notes:
1. Berkmar Overlook west of Berkmar Drive employs on -site detention, detained
offsite Q peak more accurately models (HydroCAD) post-DEV Q peak rates.
2. Berkmar Self -Storage should rely on post-DEV scenario anticipated by
WPO201800030 which proposes on -site detention with improvements at
ACSPCA. HydroCAD for ACSPCA (anticipated future development) and
Berkmar Overlook (existing development) should reflect detained off -site pre-
/post-DEV discharge rates when evaluating Berkmar Self -Storage storrnwater
quantity compliance.
3. Analysis that may not consider detained release from off -site sources that
contribute runoff to ex. dry detention basin (Kegler's Pond) requires revision,
and may ultimately require Berkmar Self -Storage on -site detention similar to on -
site detention practices proposed at ACSPCA (design stage) Berkmar Overlook
(construction stage).
4. To the extent Berkmar Self -Storage relies on off -site dry detention (Keglers) for
water quantity compliance, Applicant should famish notarized Agreement
between Berkmar and Keglers. Agreement should outline shared maintenance
responsibility for the off -site SWM facility (Ex. detention). Initial WPO plan
indicates that the existing detention basin cannot provide detention for Berkmar
Self -Storage without structural modification [Stormwater Narrative, sheet Cam.
iv. Lowes: 15.40 Ac., CN =92, Tc = undefined, route Lowe's storm runoff in pre- /post-
DEV with defined Tc.
v. Keglers (bowling alley): 5.61 Ac., CN =84, Tc = undefined, route Kegler's in pre- /post-
DEV with defined Tc.
vi. Please include Construction Record Drawing, Kegler's Pond (As -built) by Dominion
Engineering, dated 3/16/16 (approved 4/7/16=WPO201600011 Rev. 1 comment date)
with Berkmar Self -Storage plans. Print /digital As -built available to Applicant.
vii. If modification proposed to existing detention (ex. dry detention basin), please provide
plan /profile detail (small-scale) of both existing structure and any proposed change.
viii. Revise calculations, as needed, to reflect ex. detention basin As -built riser rim elev.
/invert out elev. /embankment elev. /ex pipe/s DIA, etc.
ix. Rivanna Plaza drains to Ex. detention, revise calculations, as needed, to reflect pre- /post-
DEV flow from Rivanna Plaza. Note: See instrument / plat at DB-PG 3839-301,
1/13/2010 for easement/s established /vacated with WPO201100076 (Rivanna Plaza).
5. If on -site SWM is required, a recorded SWM facility /public drainage easement plat (with deeds) is
required for VSMP /WPO plan approval.
6. If on -site SWM required, please include Construction Record Drawings (As -built for VSMP on the plans,
as well as practice -specific SWM installation, periodic inspection /maintenance information on the plans.
7. C6.0, C6.1
a. Ref. comments elsewhere. Revise pre- /post-DA maps to define discrete contributing DAs with
more accurate CN /Tc values.
8. Letter of nutrient credit availability (5.0 lb.) must be included on the plans.
Engineering Review Comments
Page 5 of 6
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 disapproved for reasons listed, below. The erosion control plan content requirements can be found in
County Code section 17-402.
1. C3.0
a. Indicates 4.74 Ac. limits of disturbance. VAR10 registration statement indicates 5.44 LOD.
Please revise plan or registration statement for consistency /accuracy.
2. C3.2
a. Both sediment traps lie immediately adjacent to a developed property to the south (Harvest
Moon). Provide additional ST2 dry storage capacity.
b. Recommend provide additional STl wet/dry storage capacity.
Note: An incident release of sediment -laden site runoff will route thru ex. detention basin and may
affect ponds in residential areas downstream of the detention basin located E of U.S. Rt. 29
(Carrsbrook subdivision), a circumstance to avoid via design. One way is to increase volume of
temporary sediment traps.
c. Pipe 119 leaves MH Str. 104 at an acute angle. Revise pipe-to-MH design (90-deg, Min.).
d. Provide double row SF or fence -backed ("super" silt fence) between sediment traps and Harvest
Moon (HG Land, LLC) to the south.
e. Label sediment trap floor dimensions (L x W).
3. Provide interim `Mass grade' ESC plan, a stage intermediate to Phase 1 and Phase 2 (between C3.2, C3.3).
Phase 1, C3.2, shows no grading, Phase 2, C3.3, shows complete build -out, and traps removed. Depict
ESC measures required to prevent off -site sediment transport as site is brought to grade, as improvements
are constructed. This may entail smaller traps, or traps in multiple locations. Also, a primary focus of
interim ESC measures is to avoid discharge of sediment -laden runoff to Harvest Moon or to ex. dry
detention basin from SW quadrant of Berkmar Self -Storage tract, shown as graded turf at completion.
4. Point of Int. with Berkmar Drive is of special concern, provide interim ESC design to ensure no tracking of
mud or sediment onto Berkmar Drive as grading /building and parking lot construction proceed.
5. Depict /provide ESC narrative for right turn lane from Berkmar Dr. Depict right turn lane ESC measures.
6. Provide and label ESC measures between proposed 10' asphalt sidewalk and Berkmar Drive.
7. C3.3
a. Provide SF between site and Keglers to east to extend from cut /fill transition (contour 494') to SE
comer of parcel.
b. Provide RWD at 482' (f) and /or appropriate ESC measures to prevent runoff reaching U.S. Rt. 29
until relatively steep 40' pvt. ROW between site and Rt. 29 is paved (25' width).
8. C4.0
a. SW quadrant of site (layout and utility plan) shows existing grade, inconsistent with proposed
grade shown on C3.3. Revise C4.0 to show proposed final grade.
9. C5.0
a. 40' pvt. ROW includes an existing gravel road half the width (or less) of proposed final 25' paved
width. Ex. drainage with respect to U.S. Rt. 29 is unclear, but final condition proposes to tie new
25' wide pavement with existing paved road that then continues and connects with U.S. Rt. 29.
Provide /show drainage /storm conveyance for this 25' paved connection between Berkmar Self -
Storage and U.S. Rt. 29, design should prevent runoff from this facility entering U.S. Rt. 29.
b. Recommend different hatching for cemetery zone since hatching may be misinterpreted as
proposed grading across a cemetery.
c. Recommend paved walk /stairs between 9 parking spaces located on 25' paved road (40' pvt.
ROW) and 4-story self -storage since use of slope without a designated pedestrian facility may
direct sediment -laden runoff immediately to DI 112, and thence to ex. dry detention basin.
Engineering Review Comments
Page 6 of 6
`Next Steps' after WPO plan approval
1. Purchase Nutrient Credits (5.00 lb. nutrient credit purchase required)
a. Please coordinate with the County reviewer before working with a nutrient bank. The reviewer
must confirm if your project must follow the DEQ hierarchy requirements.
b. Letter of availability must be provided on the WPO approved plans.
c. Applicant must contact/coordinate nutrient purchase with Ana Kilmer, akilmer e albemarle.org.
d. Affidavit of Purchase must be provided to Ana Kilmer before a grading permit can be issued.
2. Post WPO Bond
a. Applicant must submit a `Request to Establish a Bond' forrn and fee to CDD.
i. Complete the form and email it to akilmer(a),albemarle.org, along with proof of payment
(see below).
b. Payment can be made either online or with a check.
i. If paying online:
1. Go to the online payment portal.
a. Select WPONSMP as the application `type.'
b. Type in the WPO number and project name in the Notes/Details section of the
form.
C. Type in the `payment amount' as $294.34.
d. Click "Proceed to Secure Checkout" link to make payment.
2. You will receive a receipt in an email.
ii. Email a copy of the receipt to akilmerkalbemarle.org.
c. Once the bond request and payment are received, the applicant can provide the bond estimate
(completed on the County worksheet), or Engineering staff will complete the estimate. Once the
estimate is approved, Ana Kilmer will contact and work with the applicant to post the bond.
Obtain DEQ Permit (LOD > 1 Ac.)
After nutrient credits have been purchased and the bond has been posted:
a. County staff will register the project with DEQ.
b. Applicantloperator listed on the Registration Statement will receive an email with instructions on
how to pay the DEQ permit fee.
c. Applicant must email a copy of the DEQ receipt of payment to charris6dnalbemarle.org.
d. DEQ typically will issue a permit within 2 weeks of receiving payment.
4. Request pre -construction meeting:
a. Complete and email the Request for a Preconstruction Meeting and Grading Permit
to charris(a,)albemarle.org.
b. Pay the fee via the online payment portal or a check at the pre -construction meeting. If paid
online, email a copy of the receipt to charrisAalbemarle.org.
All steps must be completed before the grading permit can be issued.
County forms can be found on the county website forms center under Engineering Applications:
https: //www.albemarle. org/govemment/community-deveiopment/al)ply-for/engineering-applications
Thank you.
Please call if any questions — tel. 434.296-5832-x3069, or email ianderson20albemarle.org.
WP0202200032_Berkmar self storage_VSMP_082522