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Supplemental Geotechnical Evaluation GEOCON NORTH W EST, INC. GEOTECHNICAL CONSULTANTS _ February 21, 2003 P1150-05-02 Mr. Greg Berry City of Tigard 13125 SW Hall Blvd. Tigard, Oregon 97223 SUBJECT: CITY OF TIGARD LIBRARY TIGARD, OREGON SUPPLEMENTAL GEOTECHNICAL EVALUATION Dear Mr. Berry; In accordance with our proposal P03-05-06, dated January 23, 2003, we have completed a supplemental geotechnical evaluation for the proposed City of Tigard Library located east of the intersection of SW O'Mara Street and SW Hall Boulevard. This letter provides a summary of observations made during the supplementary evaluation in the context of the initial geotechnical report completed by Geocon Northwest May 10, 2002 and entitled "Geotechnical Evaluation, City of Tigard Library, Tigard, Oregon." The supplementary geotechnical evaluation was completed in response to the relocation of the library and associated parking within the site. SITE AND PROJECT DESCRIPTION The City of Tigard Library site is approximately 14.7 acres located on the east side of SW Hall Boulevard, east of SW O'Mara Street. The majority of the site is undeveloped and has been used as pasture. Single family residences occupy the southwest and northwest portions of the property. Fanno Creek flows adjacent to the north and east portions of the site. The proposed Library consists of an on-grade, two-story structure with associated access roads, parking, pedestrian walkways, and landscaping. Discussions with kpff Consulting Engineers, project • structural engineer, indicate that maximum column loads (dead load plus live load) are estimated at 225 kips. The main library structure has been relocated and changed to extend west, adjacent to Hall Boulevard. The orientation of the structure has also been modified. The south portion of the site is slated for parking and access. These changes resulted in structural components being located in areas of the project site not previously evaluated. No basements or underground structures are planned. It is estimated that site grading will consist of moderate cuts and fills. 8380 SW Nimbus Avenue • Beaverton, Oregon 97008 • Telephone (503) 626-9889 • Fax (503) 626-8611 City of Tigard Library P1150-05-02 Tigard, Oregon February 21, 2003 Supplementary Geotechnical Evaluation Page 2 SUBSURFACE INVESTIGATION The subsurface soil conditions encountered during the supplementary investigation were determined based on the field exploration, laboratory testing, and the general similarity to the subsurface conditions encountered previously. The supplementary field exploration was completed February 5, 2003 and consisted of two dilatometer soundings and four shallow borings. The approximate locations of the soundings and borings, complete with those done previously, are shown in Figure 2, Site Plan. Two dilatometer soundings were completed at the west portion of the proposed building footprint. The soundings were advanced to approximately 31 feet below the ground surface. A member of Geocon Northwest's engineering staff recorded the thrust and pressure readings every eight inches as the dilatometer blade was advanced. Due to the high degree of reproducibility of DMT soundings, the data obtained during the in situ test provides an effective method to ascertain soil similarities to work done in nearby locations. Logs of the dilatometer soundings are attached in Appendix A at the end of this letter. Four shallow borings, drilled to depths of approximately 6.5 feet below the ground surface, were completed within the proposed south parking area. The borings were completed with a trailer mounted drill rig equipped with solid stem auger. A member of Geocon Northwest's geotechnical engineering staff collected soil samples and logged the subsurface conditions encountered within each boring. Standard penetration tests (SPT)were performed by driving a 2-inch outside diameter split spoon sampler 18 inches into the bottom of each boring, in general accordance with ASTM D 1586. The number of blows to drive the sampler the last 12 of the 18 inches are reported on the boring logs located in Appendix A at the end of this report. Disturbed bag samples were obtained from SPT testing. Exploration logs describing the subsurface conditions encountered within the borings are presented in Appendix A at the end of this report. The subsurface explorations were widely spaced across the site and it is possible that some local variations and possible unanticipated subsurface conditions exist. Based on the conditions observed during the reconnaissance and field exploration, the subsurface conditions, in general, consisted of the following: TOPSOIL —Approximately 6 to 12 inches of organic topsoil was encountered at the surface in the exploratory locations. WILLAMETTE SILT- In general, a medium stiff to stiff silt with varying amounts of fine-grained sand and clay was encountered within the borings below the topsoil layer. Analyses of the dilatometer test City of Tigard Library P1150-05-02 Tigard, Oregon February 21, 2003 Supplementary Geotechnical Evaluation Page 3 data suggest that the soils consist of interbeds of sandy silt and silty sand, characteristic of the Willamette Silt deposit. The silts and sands were present to the depth explored. The subsurface conditions encountered were substantially similar to those encountered during the initial geotechnical investigation and appear to be consistent with geologic conditions mapped within the region. GROUNDWATER—Groundwater was not encountered during the supplementary field investigation. Groundwater was measured at approximately nine feet below the ground surface during the previous investigation. LABORATORY TESTING Laboratory testing was performed on selected soil samples to evaluate moisture content, grain size distribution, and compaction characteristics. Visual soil classification was performed both in the field and laboratory, in general accordance with the Unified Soil Classified System. Moisture content determinations (ASTM D 2216) were performed on soil samples to aid in classifying the soil. Grain size analyses were performed using procedures ASTM D 1140 and ASTM D 422. Compaction characteristics were determined in substantial accordance with ASTM D 1557. Moisture contents are indicated on the boring logs, which are located in Appendix A of this report. Other laboratory test results for this project are summarized in Appendix B. CONCLUSIONS AND RECOMMENDATIONS Field and laboratory test data were analyzed and the results were compared to results obtained during the initial geotechnical investigation. Variations in test results appeared to be relatively slight and consistent with anticipated differences in soil characteristics across the development site. Based on the field investigation and laboratory test results there did not appear to be any significant geotechnical issues unique to the locations evaluated during the supplementary work. As such, it is Geocon Northwest's opinion that the May 10, 2002 geotechnical report entitled "Geotechnical Evaluation, City of Tigard Library, Tigard, Oregon" is applicable, without change, for the relocated library, increased maximum column loads, and relocated associated parking and access roads. APPENDIX A FIELD INVESTIGATION The subsurface soil conditions at the site were determined based on the literature review, site reconnaissance, field exploration, review of geologic literature and previous reports, and laboratory testing. The field exploration was completed on January 28, 2003 and consisted of two dilatometer soundings (D-5 and D-6) and four shallow exploratory borings (B-3 through B-6). The approximate locations of all the explorations completed at the site by Geocon Northwest are shown in Figure 2, Site Plan. Subsurface logs of the conditions encountered during the supplemental investigation are presented in the following pages. Both solid and dashed contact lines indicated on the logs are inferred from soil samples and drilling characteristics and should be considered approximate. r City of Tigard Library P1150-05-02 Tigard, Oregon February 21, 2003 Supplementary Geotechnical Evaluation Page 4 Please contact us if we can be of further assistance. Sincerely, GEOCON NORTHWEST, INC. ics3tei_dux.„_#(44711 Heather Devine, P.E. Wesley pang, P.E., Ph.D. Geotechnical Engineer President cc: Mr. John Mayer, Kpff Consulting Engineers ,�toc�EQ PROpFS �S a G I N E F s/0 4 9 18281 OREGON in FXPIRATION DATE �~,...J..�.•.._�� APPENDIX B LABORATORY TEST RESULTS Laboratory tests were performed in accordance with generally accepted test methods of the American Society for Testing and Materials (ASTM) or other suggested procedures. Selected soil samples were tested for their in situ moisture content, grain size distribution, and compaction characteristics. Moisture contents are indicated on the boring logs in Appendix A. Other results of laboratory tests performed are summarized in the following pages. SW LOCUST; ST q o io (. . = mamscn a '2-3,-2 . ._ Sx filNQ:t:.: co F- -(� tit':: 9000 1:;; . .:0C:-.: ...SW ,-, -4•0_ •-•o:Jc 0 3+•`- 0 8000 _��' o "SW' N..mI 1APLELEAFSa. Y m SW F.--.. 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Lc, L^ +';poP �a• .1, SW CA DINAL SW SHAKESPEARE RD A pr 1 Ew;..P �� — SOURCE: 2001 THOMAS BROTHERS MAP PORTLAND, OREGON4 REPRODUCED WITH PERMISSION GRANTED BY THOMAS BROTHERS MAPS. N THIS MAP IS COPYRIGHTED BY THOMAS BROS.MAPS.IT IS UNLAWFUL TO COPY OR REPRODUCE ALL OR ANY PART THEREOF,WHETHER FOR PERSONAL USE OR RESALE,WITHOUT PERMISSION NO SCALE Gh°CON / VICINITY MAP NOR T H WES T �� CITY OF TIGARD LIBRARY GEOTECHNICAL CONSULTANTS TIGARD OREGON 8380 SW NIMBUS AVENUE • BEAVERTON, OREGON 97008 I PHONE 503 626.9889 - FAX 503 626.8611 HD/RSS DSK/D000D DATE 5/13/02 PROJECT NO. P1150—05—01 FIG. 1 ORVIC I 1 1 I 1 I I I 1 I I 1 1 I I I I 1 i TIGARD LIBRARY t_r TIGARD, OREGON _„„„„i) a .7,,likV *1 J SGILL'1'l•M' ���4 Li MO,MAX Mae Mr MM SW O'MARA a r. IL D-' k, , _ i.„ :.- ... 0 , , \lib ___._____,„„,,,.„,,,,,....- IIMM WED eta.u„ MC-..mrw .ige oxer 1 • `w° ''' . AM di'4/1 --98' 150' •; D-1 ;oar max mum •40,10..1111P1 Mil o.0 11111 ,,,_ :114:pitigr--- $ .Vu.,..i Ali al or jfl LEGEND � _��� 11111L �� C BB APPROX.LOCATION OF BORING •0r... -'- 777 IN ' -,r go7r: T..-T.: �� �� '� _-- �\ D-6®....APPROX.LOCATION OF CONE PENETROMETER `'II APPROX LOCATION OF DILATOMETER GEOCON IIIL 4.7 Alp •� NORTHWEST. INC. GEOTECHNICAL CONSULTANTS 8380 SW NIMBUS AVENUEBEAVERTON,OREGON 90008 PHONE 503 626.9809.FAX 503 6268611 PROJECT NO.P1150•05•02 SITE PLAN FATERE 2 PRSMOI.DWG,RSS Dilatometer D-5 Tigard Library P1150-05-01 Tigard,OR February 10,2003 DMT-5 Modulus M(tsf) 0 200 400 600 800 1000 1200 0 5 - 10 15 - a- 43 m 20 25 30 - 35 - APPENDIX A FIELD INVESTIGATION The subsurface soil conditions at the site were determined based on the literature review, site reconnaissance, field exploration, review of geologic literature and previous reports, and laboratory testing. The field exploration was completed on January 28, 2003 and consisted of two dilatometer soundings (D-5 and D-6) and four shallow exploratory borings (B-3 through B-6). The approximate locations of all the explorations completed at the site by Geocon Northwest are shown in Figure 2, Site Plan. Subsurface logs of the conditions encountered during the supplemental investigation are presented in the following pages. Both solid and dashed contact lines indicated on the logs are inferred from soil samples and drilling characteristics and should be considered approximate. Dilatometer D-6 Tigard Library P1150-05-01 Tigard,OR February 10,2003 DMT-6 Modulus M(tst) — 0 200 400 600 800 1000 1200 0 5 - 10 = 15 - E z a a; 0 — 20 - 25 - 30 - 35 - PROJECT NO. P1150-05-01 CD Et BORING B 3 Z „ } W DEPTH J 3 SOIL HZF- H'' ��. _ SAMPLE O O I- LL m FEET NO.IN z (USCS) ELEV. (MSL.) DATE COMPLETED 2/5/03 CLASS cc�Cf) w� I-z H 0 F-H3 O HW J CD EQUIPMENT TRLR MT. SOLID STEM w LW w m o, z o rev MATERIAL DESCRIPTION - 0 -7-7-:_•_:.:- ^„Approximately 6-inches TOPSOIL WILLAMETTE SILT - Stiff, damp to moist, light brown SILT - 2 _ - — B3-1 1 ML 14 27.9 -- - 4 - - B3-2 i -Very stiff, moist to wet, light brown SILT, some 17 27.4 fine-grained sand - 6 - - BORING TERMINATED AT 6.5 FEET Groundwater was not encountered ✓ ▪ Figure A-1, Log of Boring B 3 TL SAMPLE SYMBOLS - 0 ... SAMPLING UNSUCCESSFUL ... STANDARD PENETRATION TEST I ... DRIVE SAMPLE (UNDISTURBED) .., ... DISTURBED OR BAG SAMPLE IL ... CHUNK SAMPLE Y ... WATER TABLE OR SEEPAGE NOTE: THE LOG OF SUBSURFACE CONDITIONS SHOWN HEREON APPLIES ONLY AT THE SPECIFIC BORING OR TRENCH LOCATION AND AT THE DATE INDICATED. IT IS NOT WARRANTED TO BE REPRESENTATIVE OF SUBSURFACE CONDITIONS AT OTHER LOCATIONS AND TIMES. PROJECT NO. P1150-05-01 w CD w BORING B 4 z W., r .\ DEPTH 0J CC SOIL HHZF- H'• �" IN SAMPLE O 0 2E z CLASS ¢¢\ ZLI- =F- FEET N0' H o (USCS) ELEV. (MSL.) DATE COMPLETED 2/5/03 �H3 0� Hz J 0 EQUIPMENT TRLR MT. SOLID STEM w w ce m >-a z o — MATERIAL DESCRIPTION - 0 - Approximately 6 to 12-inches TOPSOIL WILLAMETTE SILT - 2 - Stiff, wet, light brown SILT, some fine-grained sand - _ B4-1 1 ML 26.0 -- - 4 - 116 B4-2 -Increasing moisture 11 29.6 - 6 - BORING TERMINATED AT 6.5 FEET Groundwater was not encountered Figure A-2, Log of Boring B 4 TL SAMPLE SYMBOLS O ... SAMPLING UNSUCCESSFUL U ... STANDARD PENETRATION TEST II ... DRIVE SAMPLE (UNDISTURBED) 'At ... DISTURBED OR BAG SAMPLE L ... CHUNK SAMPLE Y ... WATER TABLE OR SEEPAGE NOTE: THE LOG OF SUBSURFACE CONDITIONS SHOWN HEREON APPLIES ONLY AT THE SPECIFIC BORING OR TRENCH LOCATION AND AT THE DATE INDICATED. IT IS NOT WARRANTED TO BE REPRESENTATIVE OF SUBSURFACE CONDITIONS AT OTHER LOCATIONS AND TIMES. PROJECT NO. P1150-05-01 ce BORING B 5 z „ } W DEPTH O ¢ OH UE- H^ W` � _ SAMPLE a SOIL H¢W o � FEET NO. H (u CLASSIN z ELEV. (MSL.) DATE COMPLETED 2/5/03 ctHu) w� Nz H O I-LIJ� �3 O HW J CD EQUIPMENT TRLR MT. SOLID STEM w w m )-e;ceft o MATERIAL DESCRIPTION — 0 Approximately 6 to 12-inches TOPSOIL WILLAMETTE SILT — 2 — Medium stiff to stiff, wet, light brown SILT — B5-1 ML 8 28.0 — 4 — _ B5-2 8 27.3 _ BORING TERMINATED AT 6.5 FEET Groundwater was not encountered Figure A-3, Log of Boring B 5 TL SAMPLE SYMBOLS 0 ... SAMPLING UNSUCCESSFUL I] ... STANDARD PENETRATION TEST II ... DRIVE SAMPLE (UNDISTURBED) DISTURBED OR BAG SAMPLE IQ _ CHUNK SAMPLE Y ... WATER TABLE OR SEEPAGE NOTE: THE LOG OF SUBSURFACE CONDITIONS SHOWN HEREON APPLIES ONLY AT THE SPECIFIC BORING OR TRENCH LOCATION AND AT THE DATE INDICATED. IT IS NOT WARRANTED TO BE REPRESENTATIVE OF SUBSURFACE CONDITIONS AT OTHER LOCATIONS AND TIMES. — APPENDIX B LABORATORY TEST RESULTS Laboratory tests were performed in accordance with generally accepted test methods of the _ American Society for Testing and Materials (ASTM) or other suggested procedures. Selected soil samples were tested for their in situ moisture content, grain size distribution, and compaction characteristics. Moisture contents are indicated on the boring logs in Appendix A. Other results of — laboratory tests performed are summarized in the following pages. TABLE B-1 SUMMARY OF COMPACTION CHARACTERISTICS ASTM D 1557 Sample No. Depth (ft) Maximum Dry Density Optimum Moisture (pefl Content (%) Composite 1-4 111.5 16.5 TABLE B-2 SUMMARY OF PLASTICITY INDEX RESULTS -' ASTM D 4318 Sample Depth (ft) Liquid Limit Plastic Limit Plasticity Index No. B1-5 12-13.5 33 26 7 PROJECT NO. P1150-05-01 ix w BORING B 6 zw, >- CD I— 0 • F- r•-: 0 DEPTH _J =3 SOIL E- LL .. co .... SAMPLE 0 0 '—.CC.—, IN x z CLASS NO. ELEV. (MSL.) DATE COMPLETED 2/5/03 cel-u) w • 1-z cn 0 01 FEET H8 cuscs, F- 03 LI LLI ml-1 0 Q: 18 1— _1 CC CD EQUIPMENT TRLR MT. SOLID STEM a3111 CC o ce a_ ,-, o u MATERIAL DESCRIPTION - 0 „..---,4- - Approximately 6 to 12-inches TOPSOIL :--,--77-i---;-- WILL/On:Ent SILT - 2 - Stiff, moist, light brown SILT _ ... _ _ B6-1 ML 12 30.8 _ - - 4 - _ - B6-2 10 25.3 - _ - 6 - -Some fine-grained sand BORING TERMINATED AT 6.5 FEET - Groundwater was not encountered ' Figure A-4, Log of Boring B 6 TL O ... SAMPLING UNSUCCESSFUL U ... STANDARD PENETRATION TEST II ... DRIVE SAMPLE (UNDISTURBED) SAMPLE SYMBOLS . $$ ... DISTURBED OR BAG SAMPLE Ii0 ... CHUNK SAMPLE Y ... WATER TABLE OR SEEPAGE NOTE: THE LOG OF SUBSURFACE CONDITIONS SHOWN HEREON APPLIES ONLY Al THE SPECIFIC BORING OR TRENCH LOCATION AND AT THE DATE INDICATED. IT IS NOT WARRANTED TO BE REPRESENTATIVE OF SUBSURFACE CONDITIONS AT OTHER LOCATIONS AND TIMES. 1 I I I 1 1 I I I I I I 1 I I I I I 1 P1186-05-02 Tigard Library February 21, 2003 Sample: B4-2 Tigard, Oregon Dept-t14--5-feet 100 a a a 80 - - - 60 - - - bn .5 W a 40 - - \IK 20 0 , - , - , - , 10 1 0.1 0.01 0.001 Grain size(mm)