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Report OJ / 01 , TUE 13:11 FAX 503 670 9147 t;ANLJUPI ttJitnv _ C arlson Geoteci. _iical manor. alma Office Bend Office P.O. Box 29814 4umr Hudson Ave.. NE P.O. Box 7919 A Division of Carlson Tearing. Ina. Tigard. Oregon 97281 5ffiem, OR 97301 Bend, OR 97708 Geote al Consulting Pharos (503) 684.3480 Phone (503) 599 -1252 Phone (541) 330 -9155 Construction Inspection and Related Tests FAX (503) 670.9147 FAX (503) 589 -1309 FAX (541) 3368163 Final Summary Letter June 14, 2004 w • 5 7-02 - Cr0 3 3 5 Mr. Mark Hansen / 090 5� Derek L. Brown & Associates, Inc. 9500 SW Barbur Blvd., Suite 220 // // ,,[ Portland, Oregon 97219 �U� ry9/ Re: Final Letter of Geotechnical Observations (� Hawks Beard Townhomes SW Hawks Beard Street Tigard, Oregon CGT Project G0202050.A Carlson Geotechnical (CGT) served as geotechnical Engineer -of- Record (EOR) for the Hawks Beard Townhomes project, located at the intersection of SW 130 Avenue and SW Hawks Beard Street in Tigard, Oregon. We performed a geotechnical investigation of the site, the results of which were presented in our report of Geotechnical Engineering Services dated December 10, 2002, and performed geotechnical observation during construction. Our observations were completed on an on-call, part-time basis between the dates of November 19, 2002 and July 17, 2003. This letter concerns observations and testing performed on Lots 1-6 since the final summary letter dated November 19, 2003 was sent out. G Site Stripping: Prior to construction, the site contained surface vegetation in structural areas. Roadways and lots were stripped of vegetation between November 19 and 25 2002. Based on our field observations, the site was stripped of organic topsoil in general accordance with our recommendations. o Subgrade Conditions: After stripping had been completed, the site subgrade soil was cement treated for planned construction activities in the winter. Based on our field observations, the subgrade soil has been prepared in general accordance • with our recommendations. o Roadway Fill Placement and Compaction: Up to 2 feet of fill was placed and compacted on roadways in the southeast corner of the site. CGT conducted 6 in- place relative compaction tests on the native brown sift fill. Based on our field observations and in place density testing the native silt fill for roadways was placed and compacted in general accordance with our recommendations (92 percent of ASTM D- 1557). o Roadway Aggregate Base Rock: CGT conducted 12 in -place relative compaction tests on the roadway aggregate base rack on May 2, 2003. The roadway •I U4/U1 /;'b rut 1j:iG FAA .Dud DIU 1019r IrAKLJUIY 1E01II'3 ' vu. _, 4 Hawks Beard Townhomes Tigard Oregon June 14, 2004 aggregate base rock was prepared in general accordance with the recommendations given by the City of Tigard (95 percent of AASHTO T -99). Roadway Pavements: Asphalt was placed on the South Alley, North Alley, Hazelwood, Briarwood, Woodridge, Huntnoton, and Hawks Beard on May 13, 2001 CGT conducted 17 in -plane relative compaction rests oa OW.: asp1 ia'i Test results ranged trcrri 91 to 93. 1l percent of AS �T M 0 -2950. O Lei's! Baser; on flair fteafi nilsmin lot 6 th - n' 13, ►a lots G through r_ n _ ' - -• - - - , v:.. .. +ti: u�ii E.i .. .J6v. Y is ll:r .iL�' -.I v L''lc: 1. cut and are C.1 1 Id LIVE s` The remaining 5 3 lots are on st.ucturai i i up to 3 feel deep. 'used on ow observations and n -place relative comraciin-, testinc, ►„:c 1 t through 67. have been rr ©n7r in . - - -! . - 7c. l..:-.. dth � .- .� -.. .. � :,. � �. �._ �,,...- .. ..u�....� .. �F'.I our i:�_ ..i..i .Ii.l•�1 . LSJIts_ o : ;y'.)L.t,;,9u zy:e.iew,si: FC'1ncation bearing surfaces .;ere not prepared at the time of this report: therefore, we have not d:i}scrverl a y of the fc tnsini c ? phgrerle s cil s f ?h H :,.r_ _., L � _. .. J . � h L v ... i �j:..: il,'� � ""( = T'.. 1_,1 �1.:..... _ � - L..ti - "11J ...1.T1i uT!' =, 'X. ;ci. .:u..: :i&-r. — :ir..:j.`V-avo u::.:ir.,�...SVCi.. u-- 6-aui. i Zi_-el- :_;.:L?: ^�:.i; ar .:-- r7Tlu. o 2 I.trlifead5..8a ?Cli they the t ^h;w of Marro i no r, recr!1: -� ' r ' : ) . 'Ci for Ini f' f.... , -.. `,.. .1 Y . ,.*1- ;:.Ben t'o`rtt.iDa,I.::_.C.'eii. CG. \:oridu r-i:;. _ I,eC C! 28 1.1 •leis:: tr.:l:r.'Fi:C rC n2 -ctio tear oP t iiihr trenri-, t•:-•r- 3 .4ilt m- fcri�I r.. tti` ` .....'vor . a. 2eir._ 1 oi•. Div' _. -+1.:. _y eea_rn G t; ...rill.li ti 1.-,:,-: les .jaCt.filt has been compac °3c: in general eccorJ2i'ice. with the ,_corn:n nn:3iions .wren by City of Tigard (95 percent of AASHTO T -99). Based on our obs_iva.io s, as CiaCtini =o ed in our field reports, and to the bast or our knowledge, within our scope of veil <, the above geotechnicai summaries accurately reflect our observations. Our services were provided on an on -call basis, in which we retied on the contractor tc conloct our Gardc ' for the it i` of our services. L�IF? I 1 r '� "i:C. a.." responsible i• ✓' those g i'.clill Lt J� held s;EJTiI: rti )t PC t. `- items, If any• that we did not observe or test Sincere1;;, vi._ , --- , d_ . tfi - d i tti a ::.. j . l 'technical Staff ir - :: nne M. theme , P.E. i •` ._,_s? -- 36.[x9 -: Pri =.ipal G_ 'technical Engineer - Doc ID: P :IGEOTECI•IIPROJECTS12002 Proiel t-'Jir vks Beard Townhornes - COS1Rn2i Latt9r.DOC Carlson Geotechnical Page 2 of 2