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  • 1'

    GEOTECHNICAL ENGINEERING REPORT

    PROPOSED RESIDENCE

    PHIL AND NATALIE MORRELL 10022 51ST AVE. SW

    SEATTLE, WASHINGTON

    Prepared by: :vtark Otten Engineering

    3029 NE 182nd Street Seattle, \VA. 98155

    December 6, 1996

  • -~ (j

    TABLE OF CONTENTS

    CO~TENTS

    I .0 INTRODUCTION

    2.0 SlTE DESCRIPTION

    3.0 PROPOSED PROJECT DESCRIPTION

    4.0 SUBSURFACE CONDITIONS

    5.0 PRELIMINARY GEOTECHNICAL ENGINEERING RECOMMENDATIONS

    Earthwork Building Foundations Slope Stability Control of Groundwater Lateral Earth Pressure on Basement Walls Summar\· andConclusions

    REFERENCES

    FIGURES

    Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

    SITE PLAN GEOLOGIC CROSS-SECTION A-A PROPOSED PLAN PROPOSED SECTION A-A FOUNDATION DETAILS

    APPENDIX A BORING LOGS HA-! THROUGH AH-4

    APPEJ\'DIX B SOIL TECHNOLOGY APRIL 30, 1996 REPORT

    PAGE NO.

    2

    3

    4 4 5 5 6 6 7

    8

  • \

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    Note: Base map from survey by Lund & Associates.

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    (jl ~ .- ...c.. ~ ro ? C. ro

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    \1

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    EXISTING GARAGE

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    \ \

    Property Line Cfyp) - ,.- · ~ - · ~\ - · - -· · 11--1, . ci:;., ?ii I 30 '\

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    EXISTING HOUSE

    30 'l. l+lA-4 ~,/ \

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    l ~ ',,,

    . - - ··- - .... . - - . -· -\ \

    0 20 --------~ FEET

    10022 51 st AVENUE

    SITE PLAN

    Otten Engineering prepared by: Mark T Otten, P.E.

    DEC. 6, 1996 FIGURE 1

  • 40

    30

    ,,1··-.

    51st AVE Pavement

    10022 51 st Avenue

    40 HA-3-,-

    - - - --:;s, HA-1 _ - - _ - ~rgan~ - ~ Approximate Ground Surface __ - .- -,i~e _§>~i~t:b\a~\

  • \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \

    Note: Base map from survey by Lund & Associates.

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    A

    \ \

    -·--·-- Property Line (Typ)

    \ ,------- 30 FT. \ \ \ \ EXISTING GARAGE I!

    \ I I/

    \ I I'

    -1' A \'\- -

  • 40

    30

    -----~ 51st AVE 10022 51st Avenue

    • Pavement.

    I - J- -

    . ......1

    ------' , STREET r J - - - - - - - - - - - - ; ELEV. 22.5 FT. ..-: r . -

    20 : .5Z - -

    10

    Groundwater depth at time of drilling.

    ASSUMED THIRD LEVEL 43.0 FT.

    .- J -'

    ASSUMED SECOND LEVEL 34.0 d -- - - - -- -- --:::--,.,.-

    - _sz_

    ---------

    0

    ASSUMED FIRST LEVEL 25.0 FT. RANGE 25 TO 28 FT.

    NOTE: INTERIOR FOOTINGS NOT SHOWN, BUT ARE REQUIRED FOR COLUMNS.

    10022 51 st AVENUE SW

    10 PROPOSED SECTION A-A --------- Otten Engineering prepared by: Mark T. Otten. P.E. FEET Dec. 6, 1996 FIGURE 4

    40

    20

    10

  • (

    ' I I I

    I

    I 1.

    PROJECT:

    Visual Description

    Grass at surface.

    Soft, wet, brown ~t (fill).

    BORING LOG HA-1-- ---1 Approximate Surface Elevation: 32.5 Feet.

    Depth

    (feet)

    Water Contents

    20 40

    ( 1 O feet above street elev.)

    Notes 60

    I

    I r-- -------------

    Soft, wet red-brown mottled. very silty, fine sand. · with trace orgarir"cs.

    Groundwater at approximately 6 ft.

    Soft, wet, blue-gray fine sanq_y aj_lt with gr?yel.

    Lenses of black silt with organics.

    4 S-1 . GS: ------------------------------------Very silty,

    fine sand.

    6 · 2': ATD - S-2 - ?" -,_...,

    --- 8

    ! ----------

    Medium stiff wet, biue-gray, silty clay.

    S-3! • 34 80% FINES LL42%

    ·-------------- PL 16%

    ; I

    I

    / Bottom of boringJ Q ft 1 o ir0

    Notes: (1) Soil descriotions and stratum iines are interpretive and actual changes may be gradual.

    (2) Soil consistencies based on qualitative assessment of auger resistance and sample observations in the auger bucket. (3) Groundwater depths based on observations at time of drilling and will change with time.

    = 10

    - 12

    Pl 25% (CL).

    -- --·----------------------- -------------- ------------ ------- Sample and Test Key.

    FIGURE A-1 Sheet '1 of 1

  • c ..

    PROJECT: BO-RING-LOG ___ HA~ Approximate Surface Elevation: 22.~ F:t \

    (Street elev.) Date Drilled: April 19, 1996 Drilled By: Otten Engineering Drilling Method: Hand Auger Sampling Method: Auger bucket Logged By: Mark Otten

    r-- I Visuai Description

    Gravel at surface.

    Soft, wet, blue-gray, slighly sandy silt with gravel.

    Groundwater at approximately 2 ft.

    Lenses of black silt with organics

    '.Depth Water Contents I

    i (feet) 20 40 -··---·-·--l----··--···-- - - -------------- .. ~-·

    ~2 -+····-······-·----.------.-·-··--- ----

    1 .

    ' -·-:-, ------;,..._

    Loose. wet, gray. fine sand.

    Soft, wet brown, organic silt, with pieces of timber in silty sand matrix.

    Medium stiff, wet. blue-gray clayey silt.

    Bottom of boring 8 ft. 6 in.

    , __ S-1

    6

    -s S-2

    '- 12

    Notes: ( 1) Soil descriptions and straturr Imes are t interpretive and actual changes may be gradual. I (2) Soil consistencies based on qualitative assessment of auger ',

    Notes 60

    (3) Groundwater depths based on observations at : resistance and sample observations in the auger bucket. L_' time of drilling and will change with time. -~---· :-------------------,-

    Sample and Test Key. FIGUREA-2 Sheet 1 of 1

  • •.

    • PROJECT: Date Drilled: April 19, 1996 Drilled By: Otten Engineering Drilling Method: Hand Auger Samp1ing Method: Auger bucket Logged By: Mark Otten

    Visuai Description

    Soil at surface. Soft. wet. red-brown mottled. very silti fine sand, with trace organics. / - - - - - -______ ./ Soft. wet, black. organic silt, with rcrten wood pieces.

    BORING LOG HA-3 ___ 1 Approximate Surface Elevation: 38.5 Feet

    I

    I Depth

    (feet)!

    water Contents

    20 40

    (6 feet above north yard

    Notes 60

    ' ' . ---- --~---- ------·--·-------------<

    ' 4 ··- - - - - - - - - - - - - - : Groundwater at approximately 4.5 ft.

    !

    I I

    Soft wet, blue-gray, fine sandy siit to silty, fine sand.

    Graces to medium stiff

    Bottom of boring 8 ft '.J ,n.

    Notes: (1) Sod descriptions and srratu,.., lines are I interpretive and actual changes may oe gradual. 1

    1

    (2) Soil consistencies based on quaiitative assessment of auger

    I resistance and sample observations in the auger bucket. (3) Groundwater depths based on observations at

    I time of drilling and will change with time. l I Sample and Test Key.

    6

    S-1 ' -- 8

    = 10

    • 33

    SZ ATD -

    GS sandy silt

    FIGURE A-3 Sheet 1 of 1

  • C

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    •. ;,-PR_O_J_E_C_T_: ----, BORING LOG HA-4--l Date Drilled: April 19, 1996 Drilled By: Otten Engineering Drilling Method: Hand Auger

    Sampling Method: Auger bucket Logged By: Mark Otten

    Visual Description

    Gravel at surface. Loose, damp, brown, gravel.(fill)

    ·--- - ----------- Groundwater at approximately 3.5 ft

    Soft, wet, blue-gray, ciyaey silt.

    Soft to medium stiff, wet, blue-gray, slighly sandy silt to silty, fine sand, with small wood pieces.

    Bottom of boring 7 ft. 0 in.

    Noies: (1) Soil descrioiions and s,ratum lines are interpretive and actual changes may be gradual.

    (2) Soil consistencies based on qualitative assessment of auger resistance and sample observations in the auger bucket. (3) Groundwater depths based on observations at time of drilling and will change with time.

    Sample and Test Key.

    1 Approximate Surface Elevation: 31.0 Feet

    ( about 8 feet above street)

    :oepth

    : (feet)

    l.--2

    4

    i '

    6

    -s

    :- 12

    S-1

    i I

    I i

    I I

    I

    Water Contents

    20 40 60 Notes

    SZ: ATD ~~~-~~~-~~~-

    FIGURE A-4 Sheet 1 of 1

  • •.

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