04-0093 Civ Eng No 1 070804
City of Yelm
Community Development Department
105 Yelm Avenue West
P.O. Box 479
Yelm, WA 98597
July 8, 2004
Robert Tauscher
JWM & A Inc.
1700 Cooper Point Rd SE #B2
Olympia, Washington 98502
RE: Civil Engineering Review No. 1
Glacier Northwest Paving and Drainage Plan
City of Yelm Project No. CIV-04-0093-YL
Dear Mr. Tauscher:
I have reviewed the plans submitted on May 27, 2004. The following are comments from the above referenced plans and need to be addressed on the future submittal. These comments are
general in nature and will need to be addressed before resubmitting the plans for final approval.
The construction documents do not have a structural section shown on the plans for the proposed concrete area.
All stormwater facilities should be sized according to the 1992 DOE Stormwater manual.
All stormwater runoff needs to be treated before it is infiltrated to ground water. The wetpond/settling basin is not adequately sized for the additional paved area. The DOE manual
requires the wet pond to be equivalent to the 6-month storm. This method requires approx volume to be +/- 17,300 cf. Currently the wet pond only has approx. 4,257 c.f.
The infiltration pond storage volume provided must be usable volume. The concrete reuse tanks and existing settling basin do not qualify for live stormwater storage.
You refer to “new holding basin” on the calculations but it does not appear on the plans to be installed. Please clarify this on the construction documents.
Page 1 of appendix B shows the hydra volume required to be 8,865 c.f. Where did this number derive from? I was unable to locate this calculation in the report.
The community development department is reviewing this application for concurrency with the State Environmental Policy Act and the City of Yelm Site Plan review policies. If any additional
requirements arise due to this review an additional letter will follow.
Please review and revise your engineering drawings. When you resubmit your package, please send 4 revised sets and two drainage reports. If you have any questions or comments, please
call me at (360) 458-8438 and I will be happy to further assist you.
Respectfully
City of Yelm Community Development
Jim Gibson
Development Review Engineer
Cc: