Report from: bob i o: Mike Kezeor hate: 1/31/2005 Time: 10:U/:12 AM rage 2 of 2
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M eedoteree •
go.saecu: y curd Eia,: SeleKeea January 31, 2005
Mr. Mike Kezeor
Gray Purcell Contractors, LLC
P.O. Box 23516
Portland, OR 97281 -3516
Re: Sanitary Sewer Discharge Modifications, Simplex Pump System for Office Structure,
Hermoso Way Tigard, Oregon
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Dear mike:
Willamette Engineering and Earth Sciences (Willamette) has completed a review of'options
to mitigate the sanitary sewer discharge problems at the referenced site. Due to the elevation
discrepancy in the City of Tigard sanitary sewer main, adequate fall from the referenced
structure to the main is not available to provide "gravity" drainage.
Willamette believes that a grinder pump system installed in the structure, discharging under
pressure to the existing service line should provide the building with the necessary sanitary
service with the least amount of disruption. Given the relatively low inflow and water use in
the structure, a single pump system (simplex) should be sufficient for the installation.
Willamette appreciates the opportunity to be of service in this matter. If you have any
questions, please contact the undersigned at (503) 623 -0304.
Sincerely,
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Robert J. Slyh, P.E.
Principal
P.O. Box 1139, Dallas, OR 97338 (503) 623 -0304
Simplex Pump System- 03\rjs:1
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From: Bob To: Hap Watkins Date: 8/17/2004 lime: 9:38:22 AM Page 1 of 1
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5rsg ceerttag cued &via Scie eed August 17, 2004
•
Mr. Hap Watkins
Building Department,
City 5 of Tigard
13125 SW Hall Boulevard
Tigard, Oregon 97223
Re: Certification of Storm Water Swale Improvements, Minuteman Press Building, 7555
Hermoso Way, Tigard, Oregon
Dear Mr. Watkins:
Willamette Engineering and Earth Sciences (Willamette) has prepared this lettetto document
the observation of the storm water facilities at the above referenced site.
Willamette believes that the construction of the storm water detention facilities is in
compliance with the approved design and meets the design intent.
We trust that this letter is sufficient to satisfy City of Tigard requirements regarding the
construction. If you have any questions, please call me at (503) 623 -0304.
Sincerely,
�imette
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EXPIRES 06/30/06
Robert J. Slyh, P.E.
Principal
•
P.O. Box 1139, Dallas, OR 97338 (503) 623 -0304
Minute Man Storm Water Certification- 04\rjs:1