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Correspondence
d August 28, 2000 • CITY OF 11G ARD AGRA Earth & Environment ORE . 7477 SW Tech Center Drive . Portland, OR..97223 -8025 PERMIT NO: BUP 2000 -00357 OWNER: Washington Square Mall PROJECT ADDRESS: 9585 SW Washington Square Mall, Tigard, OR. 97223 PROJECT DESCRIPTION: Communication Towers TYPES OF SPECIAL INSPECTION: As setout on the enclosed forms The owner has notified us that he /she will retain your services to perform Special Inspections in accordance with the provisions of the State Building Code, permit documents and special inspection requirements. The owner or the owner's agent must also confirm with you that they have authorized you to do the special inspection work. As the regulatory agency, the City requires that you do the following: 1. Submit copies of all inspection reports promptly to the building division, Architect, engineer, and the contractor. 2. Maintain one copy of each field report at the job site. 3. Submit a final report at the completion of each category of work that you Inspect. (See UBC Appendix Chapter 13 for soils special inspection final report requirements.) If you fail to comply with the above requirements, there may be cause for the City to revoke your authority as special inspector for this job. Should you have any questions, please call me at (503) 639 -4171 X 392. Sincerely, • cry Ro ert D. Poskin C.B.O. Senior Plans Examiner • • 13125 SW Hall Blvd., Tigard, OR 97223 (503) 639 -4171 TDD (503) 684 -2772 CITY OF TIGARD A Program for Inspection Services and/or Material Testing City of Tigard: BLIP #2000 -00357 Project Title: Tower Address: 9585 SW Washington Square Road, Tigard, OR. 97223 Architect of Record: Phone: Address: Structural Enigeer of Record: Phone: Address: Geo-Technical Engineer of Record: Tetra Tech/IQ.M Phone: 684 -9097 Address: 7080 SW Fir Loop, Portland, OR. 97223 Provide the following information for the testing agency chosen to provide inspection services and/or testing. * Testing Agency: AGRA Earth & Environment Phone: 639 -3400 Address: 7477 SW Tech Center Drive, Portland, OR. 97223 -8025 The owner certifies that the above noted Agency has been employed to conduct the special inspections or observations required herein. * "Notice" Special Inspection reports shall not preclude the need to have City of Tigard inspection approval on all re -bar placement. Signature of Owner: Authorized by letter, Dated 8/25/00 Phone: Print Name: Company Name: The following is a list of special inspection and/or services required by the 1998 Oregon Structural Specialty Code and Tigard Municipal Code 14.06.010 through 14.06.040. The special inspections and/or testing services required for this project to be provided by the Testing Agency, Structural Engineer or Geo- Technical Engineer of Record are as follows: 1. Structural Observation Special Inspectors for the Testing Agency shall be qualified, to the satisfaction of the Building Official, for inspections of the particular type of construction or operation. •Special inspectors shall observe the work assigned herein for conformance with the approved plans and specifications and, submit copies of all inspection reports and, a final signed report in accordance with OSSC, Section 1701.3 to the building official. ar./24.14:37 1900 FROM: 5035988705 TO: 1234567 PAGE: 1 05/24/2000 13:46 5035988705 ADAPT ENGR PAGE 01 • fa ADaPT May 24, 2000 60,//0,20"-ie _ o' 35 7 Job No. 0R99.2522 • Sprint PCS 4683 Chabot Drive, Suite 100 Pleasanton, CA 94588 Attention: Tom Hosmer • RE: LOC BLOCK RETAINING WALL. DESIGN 9585 SW WASHINGTON SQUARE ROAD TIGARD, OREGON • ADaPT Engineering, Inc.'s ( ADaPT) engineer, James D. Imbrie, has formuated a retaining wall design for the above referenced site. The plans show 2'x2'x6' ecology blocks, stacked up to 3 blocks high, retaining a slope of approximately 2H:1 V. The wall is in a U- shaped configuration and 64 feet in length. The wall is embedded one foot and retains up to 5 feet. We recommend revising the plans for a 2.5'x2.5'x5' Loc Bloc wall system stacked only 2 blocks high with a minimum embedment of 6 inches and a maximum retained height of 4 feet The upper block should be an L- shaped top block as shown in the attached figure. Calculations for wall stability are also attached. The wall subgrade should be reviewed by ADaPT prior to placement of a minimum of 12 inches of compacted crushed base. Density tests should be performed on the gravel base. Compaction should achieve a minimum of 90 percent of the maximum dry density obtained by the modified Proctor. We trust this information meets your needs. If you have any questions, please call. Respectfully Submitted, ADaPT Engineering, Inc. .tea James D. Imbrie, P.E., C.E.O Principal Engineer Attachments: Recommended Wall Design Stability Calculations Cc: Bob Long, Tetra Tech /KCM, Inc. (Fax 598-0583) ADaPT Engineering, Inc. Tel MS) 698 17700 SW Upper Boonee Ferry Roam, Suite 100 Fax (503) 6304706 Portland, Oregon 97224 • p5/24 14:37 1900 FROM: 5035988705 TO: 1234567 PAGE: 2 - . 85/24/2800 13:46 5035988785 ADAPT ENGR PAGE 82 ADaPT Engineering, Inc. 17700 SW Upper Booms Ferry Road, Sole 100 Portland, Oregon 97224 Tel (503) 598-8445 Fax (503) 598-8705 1 • , 1 . 1 i T..; F . . . : . 7 i . 1.T. . .. i. ti ii .. 1. ,-..i. 4- 1 .-._. 1- i 1 .... ,, :l •I l ' ,.....• .' - 1 . ....,' -1 1 --I ' - ''''' 1 ' 11 1' 1 1.1 • : 1 I r .• . , 1 1 .. 1 _ ..... 1 ; . ; .... . . 1 : , . I , .. I.. [ 1.: 1 i. _h _ 1 1.4 t.... r , .•: I i •.. • .. i ._. 1 .1: i ii .... ... -. I:: ... I i i . i i '. .1 I . 1. ' .!• I •.! t .. I . .. I .:. . t . I . i .1 .1. ' ,Iti' 1- l . 1. :. ! I • i. • '' . 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'D5/24 14:38 1900 FROM: 5035988705 TO: 1234567 PAGE 03 '� 05/24/2000 13:46 5035988705 ADAPT �� . • All values pet foot of wail All Vehtee per root of =It WelptgofMock 140 pct Diger= ii'r:f" ' 1 'C' r113 Coefficient of Motion . 0.4 . ' ' W1 0.0 0.000 0.0 Passive Pressure 975 pd W2 1579.0 1.250 1988.7 EF.P. • m pef Wa 0.0 2600 0.0 Surcharge 0 ft Wa tt7.a 0.933 729 Harcor0.p Force • 0 pounds W5 87.5 1.667 145.8 at d9 distance 'Ott , Allowable 13eeRng 3000 p:? • 2 187.5 F.S.Overamenp 1.5 F.S. SOQmg 1.5 Bow 100000:1. Ml 4.9 8. H2 ask Lt .0.5ft. . u IL • u d1 . . d2 Ha H4 8aer Angle All values per toot of wall • Overturning Moment 833.3 itt Slldmg Forno 720.0 pounds Vertical Weight 1750.0 pound's Resisting Moment 2187.5 &It. Resisting Passive 421.9 pounds Ree$sd7gSkiing 700.0 pWn Total Snag Reeistarce 1121.9 pounds T I •.r _ r.a+rslr. SWOv i••i� 1 ...• e y :Il T * a: ii'II- alltillikala .. • _n 1 4— Rilleilliii �J - u - la '• I - saeyINe mae rmr m in Ilc j - it =II p5/24 14:38 1900 FROM: 5035988705 TO: 1234567 PAGE: 4 �• 05/24/2000 13:46 5035988705 ADAPT ENGR PAGE 04 �OA PROF s All Values per foot of wall. Cg E OWE C i rk - Toe i3earing = 1507.6 pat c 3000 psi OK �� 14743 - Hotel Bearing -- pa r 0 pa} Area = 3.5 ft . • Sacdon Modulus - 2.0 f s • e= 0.97 ft OREGON F.S. Overturning • 2.63 > 1.5 OK Vb 04 c go F.S. Sfidmg= 1.58 > to OK 04 ,N S 23 .��eA \(� & AU Calcutationa we par foot of well Overturning Moment = 40pd • (4.5ft. + 0.5ft.)"2 / 2 Sliding Force. 40pd • (4.511. • 0.5ft +0.58. + 0.58)"2/ 2 WI - (4.5ft. + 0.58.)"2' 140pd / ( 2.100000).. 0.0 power W2 = ((4.58.. + 0.5ft. - 0.58) • (2.5ft - ((4.511. + 0.5ft.) / 19X00))) • 140txt - 1575.0 potmda W3 = (4.58 + 0.584"2.140pd / (2 = 0.0 porada W4 = 0.5.0.5ft ' 2.5ft. *140 ft - 87.5 pounds W5 = 0.5. 0.58. .2.5ft • 14011 = 87.5 pounds TOt31 VOttical Weight = 0.0 + 1575.0 + 0.0 + 87.5 + 97.5 = 17S0.00ss pounds Distance @ Wt = 2 • (4.5ft . 0.5ft.) / (3 100000) = OAOO ft Diatom* @ W4 = (RN. - ((4.511. + 0.5ft) / 10 0000)) / 2+ ((4,511, + 0.58.) / 100000) - 1.2.50 ft Olstanoe ®W3 = 258. • ((4.5ft. + 0.Sft.) / (3 )) = 2500 R Ofatarce @ W4. ((4.5tt + 0.5) / 1000008.) + (258. / 3) = 0.®38. OlStance ®W5= 2.58..2/9 =1.697 ft Resitting Moment ® W • 0.09.0.0008. - moat Restating Moment @ W2 - 1575.00 = 1968.704 Resisting Moment @ W2 - 0.00 • Z500ft = 0.00-ft. Resisting Moment @ W2.87.5* • 0.033ft. - 12.9*-ft. Reaiatitg Moment @ W2 = 87.5* • 1.6678. = 145.8* 4 Total Resisting Moment = 0.0* 4 + 1968.7*-ft • 0.0*-8. + 7290-It. + 145.8* -it. - 2197.5 •ft Resisting Sliding = 0.4.1750.0* = 700.0 pounds Passive Resistance - 375pd • (0.68..0.5R. + 0.584 /2 = 421.9 pounds Total Slidi ng Resistance = 421.95 + 700.0# = 1121.9 pounds e =(0.5 ft. +25ft. +0.511)/2 -( 2187. 58 -R- 033.34-8.)/1750.00254- 0.976ft Section Modulua - ( 0.58..25 ft. + 0.8 R.) "2 / 6 = 2.0 ft 3 Area. 0.5 ft • 2.5 ft +058.. =3.58.'2 Toe Pressure= 1750.0* /9.58."2•(4•(0.5 ft. • 2.51t. +OS ft) /((3 *(0.5ft +2.5ft +0.58) •6.1.0 ft )) • 1507.8psf Heel Pressure la less than Zero. F.S. Overarming - 2187.5 9.41 / 833.3,1-11 - 2.63 F.S.Sffdlg- 1121.9 * /720.0* =1.56 d2 - (4.58. + 0.584/ 100000 = Oft. H3= 2.5ft /100000 =o.5ft 144 = (0.5ft. / 100000) + (0.5ft. • 100000 / ((Q (1)"2 + (lmcoo)"2 )•0.5) • 100000))) + 0.58 /( [ (t)'2.+ (10,300)^20151•100000)) • Bar ogle - arctan (1 / 100000) • ISO/ PI = 0.00 degrees AUG -25 -00 FRI 15:22 P, 02 ik4, August 25, 2000 Mr. Bob Poskin City of Tigard 13125 SW Hall Blvd. Tigard, OR 97223 RE: Washington Square Mall Telecommunications site P029XCO53A 9585 SW Washington Square Rd. Tigard, OR 97223 Dear Bob: In response to your request for structural observation at the Washington Square Mall telecommunications site Tetra Tech/KCM has been informed by Sprint to use AGRA Earth and Environmental. The address for AGRA Earth and Environmental is 7477 SW Tech Center Drive, Portland, OR 97223 -8025. The phone number for AGRA is (503) 639 -3400. If you have questions or need additional information, please call Gary Gray (509) 744-9271 or me at (503) 684 -9097. Sincerely, . TETRA TECH/KCM, INC. gax f! Bill Long