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Plans (2)
For foundations designed in accordance with the recommendations provided above, total post- construction settlement is expected to be less than 1 inch and differential settlement between adjacent foundation elements is expected to be less than% inch, given the anticipated building loads for wood-framed residences. In wet weather, we recommend placing a sufficient amount of crushed rock(typically 2 to 4 inches) to prevent disturbance to the foundation subgrades. The contractor is responsible for the construction sequencing and methodology for footing excavation and construction. Consequently, the actual amount of rock placed to protect foundation subgrades from disturbance in wet weather should be selected by the contractor. Rock used to protect the subgrades during wet weather should cover the foundation-bearing surfaces and be compacted until "well keyed." Any foundation subgrade soil that is disturbed should be removed prior to the placement of crushed rock and/or pouring of the foundations. Lateral loads on footings can be resisted by passive earth pressure on the sides of the structures and by friction on the base of the footings. Our analysis indicates that the available passive earth pressure for footings confined by structural fill, or footings constructed in direct contact with the undisturbed native soil or structural fill, is 350 pounds per cubic foot (pcf). Typically, the movement required to develop the available passive resistance may be relatively large; therefore, we recommend using a reduced passive pressure of 250 pcf. Adjacent floor slabs, pavements, or the upper 12-inch depth of adjacent unpaved areas should not be considered when calculating passive resistance. A coefficient of friction equal to 0.35 may be used when calculating resistance to sliding. • • • GEODESIGN? 3 Polygon-123-03:091316 . . We appreciate the opportunity to work with you on this project. If you have questions concerning the information prmvded, please call. Sincerely, GeoDesign, Inc. - , ' �� G311 PE - ' Reed S. Kistler, P.E. ' » OREGON Staff Engineer c§() �' , 14 414w O \�� -- ^� ' V 12/31/17 !EXPIRES: � " � Shawn M. Dimke, P.E., G.E. Principal Engineer cc: Chris Walther, Polygon Homes (via email only) Mike White, City of Tigard (via email only) RSK:SMD:kt One copy submitted(via email only) Document ID.Po|vgon-|z3'n]'Oyl3|a-geN'/ots-xs-5*/jl-72'exdocx ©2016 GeoDesign,Inc. All rights reserved. NECES|GNki 4 Polygmn-123'0}:091]16 "RIVER TERRACE NORTHWEST" LOT 69 HUB AND TACK CERTIFICATION NE & SE 1/4 SEC. 6, T 2 S, R 1 W, W.M. CITY OF TIGARD, WASHINGTON COUNTY, OREGON SURVEYED SEPTEMBER 14, 2016 PREPARED FOR: POLYGON NORTHWEST COMPANY 109 E. 13TH ST. VANCOUVER, WA. 98660 LOT 68 LOT b I 79 M N89'51'15"W 90.00' "...P------27.17' ----27.17'—__.,► 16.2. o I o o b w c., O 27.00' d. I(Y h r Z D' LOT LOT }- a N 10 ` ' 1a0 25' J W d0 0 a_ ___1 0 0 J h Z _ 1 Z (n1> 27.17' '.1-16.2 .-,► W N89'51'15"W 90.00' } e=n O LOT o a 77 C 0 • U LOT m 70 U REGISTERED 3 PROFESSIONAL Z LAND SURVEYOR 6' PUBLIC UTILITY EASEMENT OREGON JULY 9, 2002 TRAVIS C.JANSEN 57751 RENEWS:6/30/2017 / G , 1h 0, I, TRAVIS C. JANSEN, A REGISTERED PROFESSIONAL LAND SCALE SURVEYOR IN THE STATE OF OREGON, HEREBY CERTIFY THAT 20 0 10 20 I HAVE ACCURATELY SURVEYED AND STAKED THE OFFSETS ` `.11 M TO THE FOUNDATION ENVELOPE FOR LOT 69 OF THE PLAT 1 INCH = 20 FEET q OF "RIVER TERRACE NORTHWEST". - DRAWN BY: T2 DATE: 9/14/16 a REVIEWED BY; TCJ DATE: 9/14/16 PACIFIC COMMUNITY DESIGN z 395_037 PLANNING - ENGINEERING - SURVEYING PROJECT NO.: (503) 941-9484 GEODESIGNY. FIELD REPORT Page 1 of 1 GDI Project: Polygon-123-03 Prepared By: Daniel Stai Project Name: West River Terrace Date: j 9/8/1 6 Location: Roy Rogers and SW jean Louise Rd Report#: 116 Arrival: 1400 Departure: 1530 Weather: Sunny, 70's Permit#: TBA Site Visit Requested By: Mike (Polygon) Met With (on site): ! Mike via Phone, Strauss Reps Purpose: i Evaluate Subgrade for Lots 53-72 Outstanding Issues: , FR 16& 17(10/21 & 10/22)Areas of fill with low density and high moisture contents in lots 1-9' Lots 53-72 Upon arrival, I observed foundation crews installing concrete forms for lots 56-59 and 61-64. Lots 53, 54, 60, and 65-'72, had not yet been excavated to finish subgrade elevation yet. Subgrade soils generally consisted of brown silt; with to minor gravel. I used a%2 inch diameter steel "T" probe to evaluate subgrade relative consistency for lots 53- 72. Lots 53, 54, and 60 had soil stockpiled over the majority of the lot area. I probed around the edges of the stockpiles. Lot subgrades were generally observed to be very stiff to hard. Lots 65-72 had 6 to 12 inches of loose soil on west side of lot(see attached site plan). I also observed loose utility trench backfill in some of the lots under proposed garage footings. The probe penetrated between 12 to 36 inches into the loose backfill. Strauss representative also informed me that they had over excavated up to 12 inches of loose fill in lots 55-59. Concrete forms will be extended down to account for over excavation. Based on observations, the subgrades for lots 53-72 evaluated today(excluding loose utility trenches) have been prepared in general accordance with our geotechnical recommendations. Distribution: Attachments: Site Plan (1) Reviewed by: SMD This report presents opinions formed as a result of our observation of activities relating to geotechnical engineering or environmental services Wy.rely on t ontra o comply with the plan{and specifications throughout the duration of the project irrespective of the presence of our representative Our work does not include supervision Or dire of the c cot.the contr soy s employees or agents Our firm is not responsible for site safety This field report is a DRAFT representation of our field observations,testing,an prelimuia orna ritfa The repo t only be considered final upon review of the GeoDesign project manager,as indicated by initials in the'Reviewed By"section Signature: 15575 SW Sequoia Parkway,Suite 100 I Portland,OR 97224 I Off 503.968.8787 I Fax 503.968.3068 y GEODESIGNz FIELD REPORT Page 1 of 1 GDI Project: 1 Polygon-123-03 Prepared p ed By: Daniel Stai Project Name: West River Terrace Date: 9/8/16 Location: Roy Rogers and SW Jean Louise Rd Report#: i 116 Arrival: 1400 Departure: 1530 Weather: ; Sunny, 70's Permit#: TBA Site Visit Requested By: Mike (Polygon) Met With (on site): Mike via Phone, Strauss Reps Purpose: i Evaluate Subgrade for Lots 53-72 Outstanding Issues: i FR 16& 17 (10/21 & 10/22)Areas of fill with low density and high moisture contents in lots 1-9 Lots 53-72 — - ------._- Upon arrival, I observed foundation crews installing concrete forms for lots 56-59 and 61-64. Lots 53, 54, 60, and 65=72, had not yet been excavated to finish subgrade elevation yet. Subgrade soils generally consisted of brown silt; with to minor gravel. I used a%2 inch diameter steel "T" probe to evaluate subgrade relative consistency for lots 53- 72. Lots 53, 54, and 60 had soil stockpiled over the majority of the lot area. I probed around the edges of the stockpiles. Lot subgrades were generally observed to be very stiff to hard. Lots 65-72 had 6 to 12 inches of loose soil on west side of lot(see attached site plan). I also observed loose utility trench backfill in some of the lots under proposed garage footings. The probe penetrated between 12 to 36 inches into the loose backfill. Strauss representative also informed me that they had over excavated up to 12 inches of loose fill in lots 55-59. Concrete forms will be extended down to account for over excavation. Based on observations, the subgrades for lots 53-72 evaluated today(excluding loose utility trenches) have been prepared in general accordance with our geotechnical recommendations. Distribution: Attachments: Site Plan (1) Reviewed by: SMD This report presents opinions formed as a result of our observation of activities relating to geotechnical engineering or environmental services w . (`' specifications throughout the duration of the project Irrespective of the presence of our representative Our work does not indude supervision Srrd of the antra aor theclontrrh The of s employees oror agents Our firm is not responsible for site safety This field report is a DRAFT representation of our field observations,testing,a refimma corn ndat considered final upon review of the GeoDesign project manager,as indicated By"section P ? rM�� r only be by initials in the'Reviewed , � J"_'" Signature: /• 15575 SW Sequoia Parkway,Suite 100 I Portland,OR 97224 I Off 503.968.8787 I Fax 503.968.3068 • _.... / I t .L.,... 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