Correspondence (686) g oy �a-�-
% J -U -B ENGINEERS, Inc.
JIJB 1 ENGINEERS • SURVEYORS • PLANNERS
2810 W. Clearwater Avenue, Suite 201
Kennewick, WA 99336
509- 783 -2144
Fax: 509- 736 -0790
September 22, 2000
Mr. Gary Lampella
Building Official
City of Tigard
13125 SW Hall Blvd
Tigard, OR 97223
RE: LOWE'S ON -SITE STORM DRAINAGE SYSTEM = TIGARD, OREGON
Dear Mr. Lampella:
We are writing pursuant to our meeting on September 13 to request approval of alternative •
installation methods per Chapter 3 of the Uniform Plumbing Code. Various construction
observation reports, materials testing reports, record drawings reflecting field changes, color
photographs and TV inspection tape are also attached to help you bring the City's inspections
current. We are hoping to gain acceptance of the on -site storm drain system prior to
scheduled date to start paving the site which is October 1St.
Our request for alternative methods is to delete the requirement for tracer wire, and flexible
couplings at manholes for the following reasons:
1.) The storm drainage system can be located from the surface by visual observation of
the pipe from manhole to manhole and roof drain leaders on the exterior of the
building.
2.) Since the storm drainage pipe installed is a flexible corrugated HDPE material instead
of rigid pipe, flexible couplings within 1 foot of the manhole are not necessary.
We have attached letters from Carlson Testing and ADS indicating that settlement at the
manholes is anticipated to be less than 1 inch and that such settlement would have no
significant effect on the performance of the pipe.
We will be checking with you early next week to verify you have all the information
necessary to complete your review.
12988-01/Lampella 9 -22 -00
• ;
r
Mr. Lampella
Engineers Surveyors Planners Page 2
Sincerely,
J -U -B ENGINEERS, INC.
Vince . Loftus, P.E.
Project Manager
Encl: Carlson Testing Letter re: settlement
ADS letter re: settlement
J -U -B Construction Observation Reports
Carlson Materials Testing Reports
•
TV inspection video tape
Record drawings of the Storm Drain System
Color photographs of the Storm Drain System
c: Mike Robinson w /encl.
Bill Crocker - Lowe's
John Harper - CDC
/Lampella 9 -22.00
.
•
«