040200 Engineering Review 2 090805
City of Yelm
Community Development Department
105 Yelm Avenue West
P.O. Box 479
Yelm, WA 98597
September 8, 2005
Bob Bromberg
13224 83rd Ave E
Puyallup, WA 98373
RE: Discovery Counseling – SPR-04-0200-YL
Second Review of Engineering Construction Documents
Mr. Bromberg:
The City of Yelm has completed the second review of the proposed Discovery Counseling Center. Your application included:
Engineering Plans dated August 16, 2005
Civil Plan Review Application
We have reviewed the plans for compliance with the City of Yelm Development Guidelines, the DOE Stormwater Manual and general standards of civil engineering practice. The following
comments need to be addressed before the plans may be approved for construction. Our comments are summarized below:
Vertical datum is required to be shown on all sheets that reference vertical elevations. Please reference a vertical datum from NGVD 1929 and adjust you elevations to coincide with
this elevation. This is a requirement when doing work in the right of way.
Your stormwater design for 2nd St uses the planter strip for retention of the stormwater. The City can not allow water to pond in this manner within the right of way. During our previous
discussions we agreed to use a system like the swale/gallery utilized in Stevens St. Too accomplish this you will need to have an underground gallery under the treatment swale.
After reviewing your drainage calculations it appears that you have used an infiltration rate (20 in/hr) that would suggest that the infiltration will be occurring in the Spanaway gravelly
soils. This is a much greater infiltration rate than will occur infiltrating through the top soils above this stratum. I am going to approve the onsite drainage as you have submitted
it. However if this onsite system does not drain in 48 hours or overtops the depression your client will be required to retrofit the pond to increase the infiltration rate to the expected
20 in/hr.
Please add your address and zip code on the title block of the plans.
Please review and revise the plans to address the above referenced comments. Please email the changes to jimg@ci.yelm.wa.us. I will review them and then request the final submittal.
The
project engineer is required to include a written response with the resubmittal, indicating how all the review comments above have been addressed or responded to. This will significantly
expedite our review of the project. If you have any additional questions or comments please do not hesitate to call or contact me at jimg@ci.yelm.wa.us.
Community Development Department
Respectfully,
Jim Gibson P.E.
Development Review Engineer
cc. Bill Turner
enc.