HomeMy WebLinkAboutSDP202200009 Review Comments Initial Site Plan 2022-03-24qoH nt 401 McIntire Road, North Wing
Charlottesville, VA 22902-4579
County of Albemarle
o � � Telephone:434-296-5832
COMMUNITY DEVELOPMENT DEPARTMENT WWW.ALBEMARLE.ORG
Site Plan review
Project title:
Rio Point Initial Site Plan
Project file number:
SDP202200009
Plan preparer:
Jessica Denko, PE / Timmons Group [ iessica.denko@timmons.com ]
608 Preston Ave., Suite 200 / Charlottesville, VA 22903
Owner or rep.:
Rio Point, LLC / 200 Garrett St., Suite 0, Charlottesville, VA 22902
kmillerAstonyoointdg.com
Plan received date:
17 Feb 2022
Date of comments:
24 Mar 2022
Plan Coordinator:
Cameron Langille
Reviewer:
John Anderson
Engineering has reviewed the initial site plan and offers these review comments for Final Site Plan approval.
1. General:
a. WPO202200011 approval is required prior to ESP approval.
b. An easement plat must be recorded prior to WPO plan approval. (Also, item 5.c., below)
c. A SWM facility maintenance agreement must be recorded prior to easement plat recordation.
2. C2.1: Please provide a more explicit reference to `VDOT plan.'
3. C2.0-C2.6
a. Revise to show Ex. paved walk along J. Warner Pkwy (C2.1). If easement exists over this walk,
please label easement and provide deed bk.-pg. ref. to (public) sidewalk easement.
b. Provide existing contour labels. No elevation is provided across existing conditions sheets.
Additional comments possible.
c. Revise steep slopes label/s to read `preserved steep slopes.' (C2.3)
d. Revise typo at WB. 173 to read DB. 173 (CIA).
e. Label preserved steep slopes (C2.5).
f. Revise parcel label ref. to Helena Ottillia Wetsel et als, consistent with county real estate records
(and C0.0) which identify TMPs 06100-00-00-16700 and 06100-00-00-167CO as owned by Rio
Point LLC.
4. C4.0
a. Revise `GIS Critical slopes — preserved' label to read `GIS Preserved steep slopes.' Critical
slopes exist in rural districts, steep slopes in development districts, and different review and
construction requirements apply to each category (steep v. critical).
5. C4.1-4.6
a. Label internal travelways `private access.
b. Provide private access easement consistent with sheet 1, ZMA2019-00008 Application Plan.
c. Label ACSA utility easements. Label ACSA easement width. A separate easement plat
application is required for ACSA utility, SWM, and public drainage easements.
6. C4.2
a. Recommend Open Space 1.1 ac. label be revised as needed to reflect <L I Ac. if future Rio Rd. E.
/J. Warner Parkway roundabout consumes a portion of Open Space. Paved roadway /public RW
likely do not qualify as Open Space.
b. Recommend C4.2 include line -type /label that depict future Rio W./J. Warner Pkwy. roundabout,
consistent with approved Timmons Group ZMA Application plan, sheet 1.
Engineering Review Comments
Page 2 of 3
7. C4.4
a. Provide (internal development) roundabout inscribed circle linework, consistent with Min. radius,
Figure 2 (table) at VDOT Roundabout Design Guidance, Version 1.1, March 2014. Label
inscribed circle R and check to ensure R attains Min. inscribed circle value (45' — 90' R).
b. Provide, show, label CG-3 Modified Truck Apron curb detail (for internal roundabout), ref.
VDOT Roundabout Design Guidance, Figure 7.
8. C4.5 (Also, C4.0)
a. Separate Rio Commons townhouse development is shown. Please include ref. to SDP202100045
on C0.0, C4.0, C4.5 to avoid any misunderstanding that Rio Commons is separate and apart from
Rio Point development.
9. C4.7
a. Revise sheet index (key map) consistent with C4.8 sheet index, which is correct.
10. C5.0
a. Review reverse slope bench requirements at 18-4.3.3.C.1. and provide design as needed when any
2:1 slope exceeds 20' (vertical interval), any 3:1 slope exceeds 30', or any 4:1 slope exceeds 40'.
11. C5.1+
a. Multiple SWM facilities shown on C5.0 series will be reviewed with WPO202200011. Please
ensure any revisions to the WPO plan translate to ESP proposed contours.
b. With FSP, please limit proposed retaining wall ht. to 10' Max (1144.3.3.A.).
c. Provide PE -sealed retaining wall plans (required for Engineering to recommend ESP approval).
d. Wherever grade concentrates storm runoff against curb, provide Aabel CG-6, as opposed to CG-2.
e. For all parking spaces fronting 2:1 or 3:1 graded slopes, provide Aabel VDOT guardrail (GR-2).
f. Provide drainage at base of proposed fill slope to convey increased volume of sheet flow away
from Rio Road East and to protect existing /future sidewalk at this location from wash, or erosion.
Sheet runoff may not release uncontrolled across this slope without capture /conveyance.
12. C5.2
a. Several extraneous TC labels with leader lines appear to float, without pointing to top of curb.
b. Provide label to identify heavy line -type rectangles that may be garage or storage units, these
features front 3:1 SWM facility slope.
13. C5.3
a. Note railing requirements, VDOT Road Design Manual Appendix All), pg. A(1)-76 for sidewalks
when separation from the back edge of a sidewalk to the top of a 2:1 slope (or drop-off > 4 ft.) is
< 5-ft., as is the case with several proposed sidewalks adjacent to SWM facilities. Provide
required railing, or at least 5' separation.
b. Inlets 602 and 504 appear to collect runoff from Rio Road East. Provide public drainage easement
beyond public RW to downstream SWM treatment or detention facilities.
c. Provide public SWM easement for proposed SWM facilities.
d. Provide public drainage easements for SWM facility outfalls.
14. C5.4
a. It appears the large SWM facility does not have an emergency spillway. SWM facility design will
be evaluated with WPO202200011, including presence or absence of emergency spillway. Special
design criteria apply to emergency spillways on fill slopes.
15. C5.5
a. Provide note to contractor to coordinate grading with Rio Commons contractor /developer.
Coordination is required to avoid misalignment (or dispute), especially given Rio Commons
reliance on retaining walls in vicinity of travelway proposed to connect the two developments.
b. Label large SWM facility, which appears to be a wet pond. If this facility has a permanent pool,
provide fixed barrier landscaping or fencing to prevent trespass, and provide signs that wam of
drowning hazard.
16. C8.0-C8.2
a. Recommend 95% compaction note/label, leader lines for storm MH str. or pipes substantially or
entirely in fill. Pipes 215, 241, 243, 245, and 221, for example. Also, MH structures 242, 244 214,
216, 208, 206, 222.
Engineering Review Comments
Page 3 of 3
b. Provide note Aabel and leader line requiring %:" steel plate floors for "step down" manholes where
difference between invert of inlet pipe and invert of outlet pipe is 4' or greater. Ref. VDOT
Drainage Manual, 9.4.8.7, Max. Grades.
17. C8.3
a. Increase pipe slope, pipe #501, to 0.5% Min.
b. Decrease pipe slope, pipe #223, to 16% Max.
c. Storm structure table reference to ht. is confusing in places, for example: 426.08', Str. #200. This
height does not appear to be an elevation reference. Please check /revise structure heights for the
four (4) structures listed with height>400'.
Please feel free to call if any questions: 434.296-5832 -x3069
Thank you
J. Anderson
SDP202200009 Rio Point ISP 032422.docx