HomeMy WebLinkAboutSDP201900001 Review Comments Initial Site Plan 2019-02-14COUNTY OF ALBEMARLE
Department of Community Development
401 McIntire Road, Room 227
Charlottesville, Virginia 22902-4596
Phone (434) 296-5832 Fax (434) 972-4126
Site Plan Review
Project title:
Berkmar Drive Apartments — Initial Site Plan
Project file number:
SDP201900001
Plan preparer:
Mitch Bowser, P.E., Timmons Group [mitchell.bowser(a)timmons.com]
1001 Boulders Pkwy, Suite 300, Richmond, VA 223225
Owner or rep.:
Uptown Village LLC / P.O. Box 5548, Charlottesville, VA 22905
Plan received date:
14 Jan 2019
Date of comments:
14 Feb 2019
Plan Coordinator:
Cameron Langille
Reviewer:
John Anderson
SDP201900001— For ISP approval (Engineering defers to Planning):
1. Boundaries of TMP #32-53 do not match current real estate records. Sheet C2.0 indicates parcel boundary
to be abandoned by separate instrument, but this poses several issues:
a. If ISP were approved and boundary is not abandoned with new boundaries created to match ISP,
there are design implications, beginning with site plan approval for an unrecorded parcel.
b. Similar to a., Sheet 0.0 bonus density relies on boundary adjustment that creates a parcel of 17.40
Ac., which does not exist at present. Engineering recommends against bonus density that reflects
17.40 Ac. unless recorded boundaries match overall acreage shown on C0.0 and C2.0.
2. Recommend include reference to SDP201900001 in plan title, if ISP resubmittal is required.
3. Provide inlet /storm pipes to capture and convey right turn lane storm runoff from Berkmar Drive. Ref.
Inset I-2, sheet C6.2. Show with ISP for recommendation of ISP approval. Note: detention may be
required.
4. Engineering cannot check stormwater quality and quantity values intended to show on -site SWM facilities
and offsite nutrient credit purchase ensure compliance with VSMP requirements, since calculations are not
provided. Energy balance equation is required at each discharge point, since release is to multiple natural
undefined channels. Provide preliminary design data to support quality /quantity values shown on C6.0
(including VaRRM .xls), or disclaimer Note that reads: "SWM values presented with initial site plan are
estimates. Albemarle County has not reviewed or approved estimates."
5. C6.0: DEQ-approved hydrodynamic separators: StormTrap® and SciClone® systems require frequent first -
year inspection, with periodic inspection, thereafter, but inspection requires safe access. Berkmar HOA
must contract for vendor maintenance and inspection services, which will be impeded if traffic is a threat,
or if parked cars prevent access. Any access to hydrodynamic separators must be located outside internal
travelways and parking drive aisles. If located in a parking space, that space is forfeit and must be striped
and signed `No parking' to ensure access is possible. Alternatively, locate hydrodynamic separator
manways outside paved surfaces, > 4-ft. beyond nearest curbing. Reference docs:
https://www.swbmp.vwrravt.edu/wp-content/uploads/HD_Application_SiteSaver_Item-9.pdf (StormTrap), and
https://www.swbmp.vwrrc.vt.edu/wp-content/uploads/fID_Application_ SciClone_ Item-Kpdf (SciClone).
For Final Site Plan (FSP) qpproval:
C2.0
Engineering Review Comments
Page 2 of 4
6. Investigate Ex. SWM basin shown near north boundary of Parcel C. SWM facilities are rarely eliminated
without design of a replacement system. Provide VSMP/WPO plan that considers impact to any existing
SWM facilities. Address loss of stormwater quantity or quality control due to final site plan design, if any.
7. Investigate suspected cemetery at southwest corner of Parcel C. Take necessary precautions and measures
required by law to not disturb and to preserve human remains, or burial caskets. Avoid impacts via design.
Properly identify, address, and mitigate any permissible encroachment upon suspected burial grounds.
8. Obtain all necessary VDOT permits to work within public right-of-way, Berkmar Drive, SR 1403.
9. Obtain and furnish copy of wetland delineation coordination with the U.S. Army Corps of Engineers.
Provide copy or evidence of permit coordination with the USACE for impacts to waters of the U.S., or
wetlands, consistent with federal and state law.
10. Proposed boundaries should be labeled as such, distinct from existing property boundaries. Boundaries
shown as existing must match recorded land records /plats. Ref. County GIS.
11. Clarify and include with FSP text of Note #8 and Exception #10 shown with cemetery label.
12. Design may not rely on County GIS, or LiDAR data. Design must be based on field survey data points
obtained within the past 12-months, or visually field -verified by the designer within the last year. Ref.
existing conditions plan view information, item #2, Final Site Plan checklist (attached).
13. C4.0: 3.5 Ac. tree save area is unrealistic. At no point does `tree save area' lie > 10' from retaining walls.
At certain points, nearest approach is 3' or 4'. Engineering advises Planning against accepting 3.50 Ac.
`tree save area' as realistic estimate of area of trees that will survive construction of high retaining walls.
Also `tree save area' must exclude ACSA water/sanitary sewer corridor near NE edge of development.
Trees will be cleared from this utility easement. Engineering recommends a 20' minimum offset for any
`tree save area' adjacent to any retaining wall.
C4.0:
14. Ensure parking /sidewalk design conforms to a permissible zoning ordinance option (Ref. pg. 17, ACDSM;
image below). Bumper blocks are required for all parking spaces 18' in length adjacent to 5' w sidewalks.
6. Parking dimensions; the following graphics is helpful in understanding the zoning
ordinance parking dimensions;
6"(in b
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1S' packing spates
6'
sidewalk -
Is' parkala ipaC es
2.- face __ 1
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side-alk
15. Provide retaining wall design for all retaining walls. Ref. Final site plan checklist.
Engineering Review Comments
Page 3 of 4
16. Provide handrail for all retaining walls > 4-ft. high. Provide detail (VDOT HR-1).
C4.1
17. Engineering recommends walk and stairs from 4 parking spaces between buildings 8 and 9 to provide
access (down) to apparent front entrance of these buildings. Similarly, recommend walk and stairs from 4
parking spaces between buildings 4 and 5 to provide access (up) to the recreational area in front of these
buildings.
18. Engineering recommends sidewalk adjacent to 4-space parking areas between buildings 8 and 9, and
between building 8 and the travelway that connects outer and inner loop parking aisles.
19. Stop signs must be shown located prior to CG-12 ramps and pedestrian crosswalks.
20. Revise CG-12 in plan view to match Detectable Warning Surface detail, VDOT sheet 3, plan sheet C4.3,
for ramps aligned perpendicular with, not diagonally to, two receiving ramps. Please call if any questions.
21. Ensure internal travelways, parking areas, islands, loading spaces, grades, etc. meet site plan requirements
listed at Ch. 18-4.
22. Provide VDOT GR-2 guardrail between 61 parking spaces and proposed retaining wall along north edge of
development, beginning northwest of building 3, ending just west of building 6, at bend in retaining wall.
C4.2
23. Inset I-2, right turn lane section: Label surface asphalt, base asphalt, and base stone thickness. Provide
pavement Design (DI, DP).
24. Design and show storm drain inlet for right turn lane off Berkmar Drive. Show storm pipe.
25. Provide stop or yield traffic sign at internal travelway intersection near north end, bldg. 12.
26. Provide VDOT GR-2 guardrail between 43 parking spaces and proposed retaining wall.
27. Provide complete retaining wall design for Engineering review. Reference retaining wall plan checklist
(attached).
28. C4.3: Provide pavement design for heavy duty pavement section (travelways /parking area aisles). Provide
ADT at full build -out. (ADT may vary for different loop sections of internal travelways.)
29. C5.0: Engineering recommends against water main /sanitary sewer pipes passing beneath retaining wall;
recommends, instead, skirting the wall entirely by routing distribution and collection around the east end of
the wall. Engineering recommends steel carrier pipes and concrete lintels for water and sewer distribution
or collection mains that may pass beneath (or through) any retaining wall.
C6.0:
30. Qio values may be relevant, but Qi-year peak flow is most relevant. Design must meet state stormwater
quantity requirements via energy balance equation based on Qi,'ear.
31. Offsite grading easements are required. Submit easement plat application. Provide copy of recorded
offsite easement deed/s.
32. Provide complete drainage design. Ref. Albemarle County Drainage Plan checklist (attached). Provide
VDOT LD-204, LD-229, LD-268, LD-269 design tables. All appear relevant. Use VDOT table format.
33. Provide contour labels for existing contours, especially south, west, and north of proposed development.
34. Ensure FSP reflects subgrade dimensions of hydrodynamic separators. StormTrap systems are far larger
than a std. VDOT MH. Plan view final site plan sheets should reflect true, not approximate or schematic
dimensions.
35. ISP proposes large volume subgrade SWM facility detention chambers with isolation chambers. Should
any of the three proposed large volume systems fail, there is no backup, or bypass. Engineering requests
Applicant submit long-term performance reliability data for proposed 30,OOOcf and 33,OOOcf systems. The
largest integrated underground detention systems approved in Albemarle County are for non-residential
sites better -positioned to deal with system replacement expense (Fifth Street Station; Stonefield).
36. Engineering encourages Applicant to split 30,000 and 33,OOOcf systems, to design, instead, independent
underground detention chambers that provide equivalent combined storm runoff control.
Engineering Review Comments
Page 4 of 4
37. Revise 33,000cf detention system discharge pipe location. Proposed location through retaining wall is
disallowed, per Engineering Division policy.
38. All detention system discharge outfalls must be to a defined channel. Propose grading to define a channel,
if none exists.
39. Evaluate new drainage channels for capacity, and erosion. Provide soil stabilization blanket, where needed.
40. Provide high -flow bypass for all hydrodynamic separators and high -flow bypass for all detention systems
for events less frequent that the 10-yr, for rainfall intensity > 5.7" in a 24-hr period. Ensure bypass
discharge does not cause flooding of travelways.
41. C6.1: Revise matchline sheet 6.1 label to read 6.2.
C6.2:
42. For proposed HDPE pipe, ensure pipe is rated adequate for depth of installation.
43. Prepare plat showing SWM facility maintenance and access easements. Show easements.
44. Prepare plat showing private drainage easements for SWM facility discharge pipes. Show easements.
45. Prepare plat showing public drainage easement for site access storm conveyance system elements along
Berkmar Drive, or within VDOT right-of-way. Show public drainage easements.
46. Ref. ACDSM image, pg. 15, when designing easement width:
EASEMENT WIDTH - DIAMETER + 3' + 3 I H-5' i + 10' 110' MEN,)
EASEMENT WIDTH
EQLANDLNGL"IP\(E\T
I /
JYPi
DIAMETER I
1'
R
STOR\(RATER
PIPE
47. Sheet scale may be inaccurate; please confirm accurate.
48. L1.0: Use hatching or other symbol to indicate areas of proposed grade steeper than 3:1 and provide note
with reference to permanent landscape vegetation hardier than grass. Ref. ACDSM, pg. 22, Sec. 8.A.2.
49. Notes:
a. An approved VSMP Plan Amendment is required prior to Final Site Plan approval; please submit
WPO Plan at earliest convenience. Coordinate proposed nutrient credit purchase with Ana
Kilmer, Albemarle County, once VSMP/WPO Plan is approved.
b. Please consider attached Final Site Plan, Drainage, and Retaining Wall plan checklists as aids to
design. Checklists guide review.
Please feel free to call if any questions. Thank you
J. Anderson 434.296-5832 -0069
SDP201900001 Berkmar Drive Apartments ISP 021419