Plans 07/07/00 FRI 17:48 FAX 503 670 9147 CARLSON TESTING (j 001
v ' Carlson Geotechnical O Se Office Bend Office
P. Box 23814 4060 Hudson Ave., NE P.O. Box 7918
A Division Of Carlson Testing, Inc. Tigard, Oregon 97281 Salem, OR 97301 Bend, OR 97709
Geotechnical Consulting R►me (503) 8843460 Phone (503) 589 -1252 Phone (541) 330 -8114
Construction Inspection and Related Tests FAX (503) 670 -9147 FAX (503) 589-1309 FAX (541) 330"9163
PROJECT ZC
FAXMEMORANDUM DM
TO: Mr_ Bill Crocker Timothy W. Blackw P.E.
1530 Faraday Avenue, Suite 125
Carlsbad, California 92008 0 PR
DATE: July 6, 2000 ��.
PAGES: 2 4 t
-I , 0REG0N Q
RE: Lowe's H.I.W. ' O • p j V . 12,
SW 72n Avenue, Tigard, Oregon `�Y w gy p,
CC: Lowes W.I. W. - Bill Crocker - FAX #(760) 804 -5332 EXP
City of Tigard Building Dept - Hap Watkins - Fax #624-3681
Continental Dirt Contractors Inc - John Harper - Fax #(253) 939 -5765
J R Bonnett Engineering - Jay Bonnett
Christensen Engineering - Ed Christensen - Fax #(503) 598 -1868
Sconzo /Hallstrom - Jim Bryan - Fax #{425) -455 -9351
JUB Engineers - Darrel Moore - Fax #(509) 736 -0790
We have reviewed the submittal from Continental Dirt Contractors (CDC) regarding a geotextile
drainage fabric for the French drains at the east end of the above project. The submittal proposes to
use a nonwoven geotextile type TNS R042. Based on our review of the properties tested per the
American Society for Testing and Materials (ASTM) standards, we take no exceptions to the use of
the proposed geotextile. The referenced submittal is attached.
We were also asked to review a proposed change in placement of the above geotextile in the
drainage trench. In our geotechnical report for the project, we recommended that the trench be
enveloped with the geotextile prior to filling it with drain rock. We understand that shoring will be used
to construct the trench, so placement of the geotextile as recommended cannot be accomplished. An
alternative would be to wrap the drain pipe with the geotextile before placing the rock around it. The
geotextile should be overlapped at the seam and secured adequately to ensure it completely covers
the entire pipe. Additionally, a layer of geotextile could be placed at the top of the drain rock, similar
to that as proposed by CDC, to limit the migration of fine material to the pipe from above_ Although
this would be less effective than the original design, in our opinion, the drain should still function
acceptably.
Our responses above concern only the geotechnical component of the drain. We recommend that
• other appropriate disciplines review the above information for their input as well.
Attachment
Document ID: Lowe's H.LW.1gridmemo.doc
07/07/00 FRI 17:49 FAX 503 670 9147 CARLSON TESTING 002
TN S Advanced
Technolog
�es
681 pc Young Road
GrLCr, South Carolina 29651
Phtme: (!t {1(t) $67 -5181
Vax: (1{64) 87'].-4rt39
Geotextile Product Description Sheet
Style TNS 8042
- INS R042 is a superior quality. nonwoven geotextile produced by needlepunching
together 100% polypropylene staple fibers in a random network to form a high strength
dimensionally stable fabric. Tne polypropylene fibers are specialty formulated to resist
ultraviolet light deterioration, and are inen to commonly encountered coil chemicals.
The fabric will not rot or mildew. IS non — biodegradable, and is resistant to damage from
insects and rodents. Polypropylene is ctable within i:i ph range of 2 to 13. TNS R042
meets AASHTO M288-92 for Nonwoven Medium Survival Separation Fabrics.
TNS A042 conform; to 1he physical properl values listed below:
•
„1.------ . —
Minumum
Average
rabric Property Test Method Units Roll
Value
Weight (typical) ASTM D 3776 oz /sy 4.5 (153 g /sm)
Grab Tensile ASTM D 4632 Ibs 1 20 (.54 kN)
Grab Elongation I ASTM D 4632 36 50
Trap Tear ASTM 0 4533 Ibs 50 (.22 kN)
Puncture ASTM 0 4833 Ibs 70 (.31 kN)
Madan Burst ASTM D 3786 psi 240 (1654 kPa)
Permittivity' 1 ASTM D 4491 1 /sec 1,8
Water Flow ASTM D 4491 gpm /sq.ft. 120 (4887 ! /min/sm)
A.O.S. ASTM D 4751 U.S_ Sieve 70 (.212 Into)
U.V. Resistance ASTM 0 4355 9/a 70
— —
_ PACKAGING
ROLL DIMENSIONS — FEET 12.5/15 x 360
SQUARE YARDS PER ROLL 500/600
ESTIMATED ROLL WEIGHT — POUNDS 152/180
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