HomeMy WebLinkAboutSDP202100056 Review Comments Final Site Plan and Comps. 2021-10-28t� OF ALB
County of Albemarle
COMMUNITY DEVELOPMENT DEPARTMENT
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Site Plan review
Project title:
Airport Road Pump Station - FSP
Project file number:
SDP202100056
Plan preparer:
Bradley J. Weiss, PE, SEH [bweissAsehinc.com ]
3535 Vadnais Center Drive, St. Paul, MN 55110
Owner or rep.:
Michelle S. Simpson, PE [msimpson(&,,rivanna.org ]
Rivanna Water and Sewer Authority
695 Moores Creek Lane, Charlottesville, VA 22902
Plan received date:
30 Jun 2021
(Rev. 1)
23Sep 2021
Date of comments:
4 Aug 2021
(Rev. 1)
28 Oct 2021
Plan Coordinator:
Andy Reitelbach
Reviewer:
John Anderson
401 McIntire Road, North Wing
Charlottesville, VA 22902-4579
Telephone: 434-296-5832
WWW.ALBEMARLE.ORG
Engineering has reviewed the final site plan and offers these review comments. A single review comment may
persist at item 5., below.
1. Recommend revise plan title to include ref. to SDP202100056. (Rev. 1) Addressed.
2. Revise TO to include reference to related plan, WPO202100035. (Rev. 1) Addressed.
3. Revise sheet list, TO1, to remove ESC-SWM-PPP (WPO plan -related) sheets from the final site plan. (Rev.
1) Addressed.
4. Revise TO topography note to confirm existing topography has been at least visually verified within the
last 12 months [See Final Site Plan checklistforplan reviewers, p. 1, Existing conditions plan view
information, 2' item —ref' alf— / . (r _ (Rev. 1) Addressed.
5. Coordinate final site plan design with VDOT. VDOT has near -term plans to extend Berkmar Drive Ext. to
Airport Drive. Ensure that the final site plan proposed grade (final contours) are consistent with roadway
extension. At present, they are not. Proposed grade suggests relatively abrupt rise into the site, with
gradual fall, west to east, across the site. Ref. sheet C 12 Grading Plan. If grade is to be flatter, consistent
with future Berkmar Drive Ext. roadway, then grades must be lowered across the site. Retaining walls may
be required between proposed development and parcel to immediate north in order to eliminate 4'-5' grade
rise at entrance to RWSA pump station. Retaining walls are a common remedy for addressing grade issues.
Retaining wall ht. > 4-ft. requires a sealed geotechnical retaining wall design. Please coordinate directly
with VDOT on Berkmar Drive Ext. (future) design, and accommodate reasonably -predictable VDOT
Berkmar Drive Ext. future design needs.
Note: Virtually all sheets of the ESP show and label Anticipated VDOT Grading Easement (Typ.), yet the
FSP proposes grades that conflict with Berkmar Drive Ext. future grading. Please revise ESP consistent
with anticipated VDOT Grading Easement. (Rev. 1) May persist. Applicant response (letter d. 9/21/21):
`We are aware of the future extension of Berkmar Drive. The Owner and Engineer have coordinated with
VDOT to the best extent possible. The plans for the permanent site access drive have been coordinated with
preliminary drawings in an effort to minimize future conflicts.' As follow-up: Please see email, Andy
Reitelbach to Brad Weiss, October 4, 2021 5:31 PM.
6. Please remove sheet C09 bioretention basin specific design elements (footprint with label is fine), as well
as sheets C10, C11, C13, C16, DC03 from the site plan since ESC measures and SWM facilities are not
Engineering Review Comments
Page 2 of 2
approved with a site plan, but with a WPO plan. WPO plan review is pending (WPO202100035). (Rev. 1)
Addressed.
7. C 12: Provide final disposition of runoff along south side of site access; specifically: provide channel lining
design and velocity/capacity calculations for runoff in ditch -line between contours 623 and 615. Proposed
grade routes runoff to a bend in site access, at which point runoff appears to sheet across site access without
routing to any SWM capture or conveyance system. Include a new Drainage Plan sheet that shows storm
runoff collection and conveyance. (Rev. 1) Addressed. Applicant: `Stormwater facilities have been
updated per conversations with J. Anderson and are shown in the resubmittal of the WPO plan.'
8. With WPO Plan, account specifically for increased sheet flow from impervious parking and site access
(reasonably anticipated to occur) along south side of development, given close proximity to property line.
(Rev. 1) Addressed. Applicant: `Stormwater facilities have been updated per conversations with J.
Anderson and are shown in the resubmittal of the WPO plan.'
9. C 15: Engineering defers to Planning Division as to whether proposed grading within 20.0' undisturbed
landscape buffer qualifies as undisturbed. U8 Existing Conditions, accurately describes existing
condition as `existing wooded area mix of deciduous and evergreen trees.' The site is 100% mature canopy
mix. If mature mix of deciduous and evergreen trees is removed, replacements will not attain maturity for
decades. Engineering defers to Planning, but if site grade is lowered, generally, it may be not only feasible
but relatively easy to preserve 20.0' undisturbed landscape buffers along parcel boundaries, for the entire
development. Engineering encourages design to preserve an undisturbed landscape buffer to the maximum
extent practical. Retaining walls may aid in addressing this and other review comments. (Rev. 1)
Withdrawn. Applicant: `This was not noted in the comments from the Planning Division. The minor
grading and replanting in the 20-foot buffer was designed in an effort to maintain as much of the mature
canopy as possible and is believed to be preferable to planting vegetative screening through a double
staggered row of evergreen trees planted 15-feet on center, as described in 32.9.7.9.e.'
Please feel free to call if any questions: 434.296-5832 -x3069
Thank you
J. Anderson
SDP2021-00056 Airport Road Pump Station FSP 102821rev l.doc