8322 Infgallery 070703July 7, 2003
Mr. Fred Murry
Easthaven Villa Assisted Care Facility Phase 2
311 Cullens Road NW
Yelm, Washington 98597
RE: Revised Infiltration Gallery Section for Roadway
Easthaven Villa Assisted Care Facility Addition
City of Yelm Project No. CUP-02-8322-YL
Dear Mr. Murry:
I have reviewed your letter dated July 2, 2003 requesting to change the infiltration gallery design. The letter states, because of the free draining nature of the soils you would like
to reduce the gallery size by reducing the cross section of washed rock used. The currently approved rock infiltration gallery size is 70’x15’x3’ with an 8” perforated pipe. This gallery
design has 1,118 cubic feet of storage. By changing the design as requested, the storage of the gallery will be reduced significantly by eliminating the voids created by the washed
rock. Without the voids the gallery cannot efficiently operate through multiple storms. Therefore the original approved design must be utilized and installed.
If you have any further questions or comments, please call me at (360) 458-8438 or email me at jimgibson@ywave.com and I will be happy to further assist you.
Respectfully
City of Yelm Community Development
Jim Gibson
Development Review Engineer
Cc: Mark Leingang PE
Tim Peterson