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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) $67 -5181 Vax: (1{64) 87'].-4rt39 Geotextile Product Description Sheet Style TNS 8042 - INS R042 is a superior quality. nonwoven geotextile produced by needlepunching together 100% polypropylene staple fibers in a random network to form a high strength dimensionally stable fabric. Tne polypropylene fibers are specialty formulated to resist ultraviolet light deterioration, and are inen to commonly encountered coil chemicals. The fabric will not rot or mildew. IS non — biodegradable, and is resistant to damage from insects and rodents. Polypropylene is ctable within i:i ph range of 2 to 13. TNS R042 meets AASHTO M288-92 for Nonwoven Medium Survival Separation Fabrics. TNS A042 conform; to 1he physical properl values listed below: • „1.------ . — Minumum Average rabric Property Test Method Units Roll Value Weight (typical) ASTM D 3776 oz /sy 4.5 (153 g /sm) Grab Tensile ASTM D 4632 Ibs 1 20 (.54 kN) Grab Elongation I ASTM D 4632 36 50 Trap Tear ASTM 0 4533 Ibs 50 (.22 kN) Puncture ASTM 0 4833 Ibs 70 (.31 kN) Madan Burst ASTM D 3786 psi 240 (1654 kPa) Permittivity' 1 ASTM D 4491 1 /sec 1,8 Water Flow ASTM D 4491 gpm /sq.ft. 120 (4887 ! /min/sm) A.O.S. ASTM D 4751 U.S_ Sieve 70 (.212 Into) U.V. Resistance ASTM 0 4355 9/a 70 — — _ PACKAGING ROLL DIMENSIONS — FEET 12.5/15 x 360 SQUARE YARDS PER ROLL 500/600 ESTIMATED ROLL WEIGHT — POUNDS 152/180 • Al lilt lime of nanu hiring idg- 1 1nntIiirii our .atangr. thcrc 'WTI. ltlrl , Tnte.tftm.""'".rd"A`'thr. info. nnti. n. cngt► YI•. IAr. c�nw a h:urnSr. \Mi iiiiir i.0 r ntirgtiIIr ati.r , i ii YndcrwhkhtNS Mrlb'ja..Juci inhs. jibe. en. to lrjV. VIu 4ri1 G r fil tliU*J,dIi,PYnln 1 4 ,6 “ , fl h pwan111nnu.gw.Ihi r•. Qn t.lrr2R. tear be a e$. We atult N. I. w .nrit.ility CA rewire ..l4altt l u t he a,.(. I' I i.'u h n in(••rnt +tiro n (hp e.n(a r i e q. ib.y lrmv pn.4llep cilharzi.nc to in et.nthinali.n �' I NUM IleI tnslit.n of ow iti wait), 1d any inrt rtthla.0 eq. awtcrWl %l ute contaup1.i1r.•I. n1 Ill l¢in.lcr P( n.e_..td r imlhr. lite .pp &rstr.l use i•d.i.. ^y ally j•*lertts is ilp: udr rs:j.. ..thili ..f the nor. RlYr2C 1U.W1: 1 11} May — �rtt