HomeMy WebLinkAboutSDP202100009 Correspondence 2021-05-18SHIMP ENGINEERING, P.C.
Design Focused Engineering
May 18, 2021
Dyon Vega
Rivanna Water & Sewer Authority
695 Moores Creek Lane
Charlottesville, VA 22902
RE: Response Letter #2 for SDP202100009 999 Rio Road — Final Site Plan
Dear Dyon,
Thank you for your review of the final site plan for 999 Rio Road. This letter contains responses to
County comments dated March 23, 2021.Our responses are as follows:
Sheet C4:
1. Please seek the ACSA water line in Belvedere Boulevard for a tap before proposing a tap to the
18" RWSA water line
RESPONSE: Comment received. The waterline has been revised to tap into the ACSA line rather
than the RWSA line.
2. Please show easement for 18" RWSA WL.
RESPONSE: The easement line is shown; the label for the easement has been included with this
submission.
3. The proposed 18" HDPE storm sewer needs at least 18" of vertical separation from RWSA 18"
WL.
RESPONSE: Comment received. Test pits are to be conducted the week of May 24, 2021. Per
RWSA correspondence, the waterline is likely to have 6-9' of cover; the profile of the storm pipe
AlA-A1B has been updated to incorporate 6' of cover of the existing waterline.
4. Storm structure Al should be a minimum of 5' from the RWSA 18" WL.
RESPONSE: Comment received. The storm structure has been adjusted.
Sheet CT
5. There is significant grading proposed around 18" RWSA WL, which will limit future access to
the water line. Please consider a retaining wall with deep enough footers to allow for excavation
around the water line or reduce grading in this area.
RESPONSE: The grading proposed around the waterline has been revised from a 2:1 slope to a
3:1 slope to ensure future access.
6. RWSA would like to request additional easement, a 30' easement for access and maintenance
based on the proposed site improvements and grading.
RESPONSE: The proposed grading adjacent to the existing easement has been revised from a 2:1
slope to a 3:1 slope. Additionally, the stormtech detention system is located more than 10'from
the existing waterline; the bottom elevation of the stormtech system is approximately 464' and
the top of the existing waterline is approximately 461'. The elevation change of 3' with over 10'
of horizontal separation will allow for maintenance of the pipe without compromising the
912 E. High St. Charlottesville, VA 22902 1434.227.5140 1 shimp-engineering.com
stormtech system. Moreover, the stormtech system only holds water during rainfall events and
typically drains down within 24 hours or less.
If you have any questions or concerns about these revisions, please feel free to contact me at
Rachel@shimp-en ing eering com or by phone at 434-227-5140.
Regards,
Rachel Moon
Shimp Engineering, P.C.
912 E. High St. Charlottesville, VA 22902 1434.227.5140 1 shimp-engineering.com