Report 03/01!05 TUE 13:11 FAX 503 670 9147 l:Aicl.bul' 1C311In' y
Carlson Geote ni s Office anical �l Main
P.o. Bea 23614 4050 Hudson Ave., NE P.O. Box 7918
A Division of Carlson Testing, Inc. Tigard, Oregon 97281 Salem, OR 97301 Bend, OR 97708
Geotechnical Consulting Construction Inspection Related Tests Phone (503) 6700.9�� Phone (503) 589-1252 Phone (541) 35 FAX 1 FAX (503) 5e9 - 1308 FAX (541)330 -0t63
Final Summary Letter
June 14, 2004
/W6 CV 3 33
Mr. Mark Hansen �//�,,,[ i 1
Derek L. Brown & Associates, Inc. 709 2O 5S ?J" 1 %�
9500 SW Barbur Blvd., Suite 220
Portland, Oregon 97219
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_
• 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.
• 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.
• 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).
• Roadway Aggregate Base Rock: CGT conducted 12 in -place relative compaction
tests on the roadway aggregate base rods on May 2, 2003. The roadway
4+dvva
U3 /U1'-, /Ub rut 13:16 ttAA i?UJ UIU .A I`+ VIII 1 11LJV 1L3lAnu
Hawks Beard Townhornes
Tfgan1 O'>;gon
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, Brianatood, Woodridge, Huntington, and Hawks Beard on May 13,
20E CGT conducted 17 in -place relative co:npeciio;: rests on tha astir-; `t. Tcs:
r`=- _.... rang .. tTi to u�, �3 p.erCet si of riSTia D-2,950.
o vg_ Baset on c it 01:serv a in'r t r ,nTh 13 r.":17' !. < s• _ - _ 3
Vv: a [_'�: - =:i . .. -._. The :'.::�:'�r:i;'r; is r i 3 f e
�. - • vv lots c;.i•: on Si°ti%ii;ra, �i i., up to 3 feet
deep. eic$e Q On OL: O 3ScI vim. Cans and -, c to i g n o ; a
� L'1- •r+i�� r�t..tJ1 �]TPf a �i)?S CP lots i
thrc-uoh 62 !`akin h_en r.°.-^ -ar d in r. _ _ ,._ - _ _ -
.. r: _
"v�;.ii'•%:crlvi 1 :::tcat.i,C aShc l: l: S ,,. prepared
r 1: I1O�t
at the tiMe of this moors; therefore, we stave not cbs of ths a
r- Til.'i a:L'I ti;l •�Ze. We tIr �i- -� 6 t� Cis y ! n
Iia
.. . Si,� rtt the; , %7P .t': ,5 _ jf_'.'7Fl ,,_ 't ='�:' fir?'` =1 • r'=
1ot r cis r - -
_ L : :: _ .:c =r: : :-..ELF �_i: :::s:i �. i' cos :i Lied 28 in - i ue • �.I�t °.i ;�:
Cooloactior! i on .4, trench ..L i :!t ____ -_i e sue_ _
_... .. ... .... ..... r. _.. _..,.. -. � :i, -.i -Ir �_. I:J.6� .�__. _ ...� - : :I,.t'.' ,v.,....G �u.., ;lit .I� Sr .-'. ti
Lo i ipuu` Go in C iei ar accordanc.'�. .:'it, . ., ,�. �;t� rr: 't c n by -
ii�i-:�rtlii%S i`dE,. City of
Tigard (9 oer en r7) /Xi SH • '
E:a_il_ . ou _ _. ! a ct -15, az. z dOCU;Y:c-I-` .1�i - ♦ e p
- ir'. vU• ii =_ i•., r• .... arid !v Ti ie be-3t or our nitt ?:_'!$Q[1 °,
within our scope of work, the above geoitechnical summaries accurately reflect our Observations.
;'' : er'M{ were provided on, =n on - :cali has s, in whi we reEed on the contractor to COi taC_'t our
the. scheduling Ililii iy Gt our :ici c5. We cal II tot Or° I t8ld (:C3r]ir';3t;glJa!iy responsible for those
irerns, If any. that we did not observe or test
l cereiy., - ...... -
■ •ter'„ hnical Staff ` -
•fir :._. ..
G nne M. erne, • P.E. R'
Pri - pal G.. =technical Engineer
Doc IQ ?:ICaoTEc IPRo EcTSM2oo2 ProJects!f -4 Beard gcwnl!wn! - COSIFcnal Laft r.DCC
•
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