prr 5509 draft landlside investigation report chelton drive

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  • 8/21/2019 Prr 5509 DRAFT Landlside Investigation Report Chelton Drive

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    RYAN GEOLOGICAL CONSULTING, INC.PROVIDING LOGICAL GEOLOGICAL SOLUTIONS

    16 Southwood Drive

    Orinda, CA 94563

    510-520-5592

    ENGINEERING GEOLOGY GEOLOGIC HAZARD ASSESSMENT HYDROLOGY GEOTECHNICAL ENGINEERING

    LANDSLIDE INVESTIGATION REPORT

    CHELTON DRIVE LANDSLIDE

    CHELTON DRIVE AND GIRVIN DRIVE

    OAKLAND, CALIFORNIA

    UNAUTHORIZED USE OR COPYING OF THIS DOCUMENT IS STRICTLY PROHIBITED BY ANYONE OTHER THAN THE

    CLIENT AND PROJECT OWNER FOR THIS SPECIFIC PROJECT.

    July 25, 2012

    Job No. 1082.100

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    RYAN GEOLOGICAL CONSULTING, INC.PROVIDING LOGICAL GEOLOGICAL SOLUTIONS

    16 Southwood Drive

    Orinda, CA 94563

    510-520-5592

    ENGINEERING GEOLOGY GEOLOGIC HAZARD ASSESSMENT HYDROLOGY GEOTECHNICAL ENGINEERING

    TABLE OF CONTENTS

    INTRODUCTION ............................................................................................................................................ - 1 -

    LANDSLIDE HISTORY ................................................................................................................................. - 1 -

    PURPOSE AND SCOPE OF SERVICES ......................................................................................................... - 2 -

    FIELD INVESTIGATION .............................................................................................................................. - 2 -

    SLOPE INCLINOMETER INSTALLATION ..................................................................................................... - 3 -

    LABORATORY TESTING ............................................................................................................................. - 3 -

    EXISTING GEOTECHNICAL INFORMATION ............................................................................................... - 3 -

    Landslide Records at the City of Oakland ............................................................................................ - 3 -

    Dames & Moore geotechnical investigation dated October 15, 1969 ................................................ - 4 -

    Un-published landslide mapping by the City of Oakland ..................................................................... - 4 -

    Geotechnical Investigations of Lot 2344 .............................................................................................. - 5 -

    FINDINGS ...................................................................................................................................................... - 5 -

    SITE DESCRIPTION .................................................................................................................................... - 5 -

    AERIAL PHOTOGRAPH INTERPRETATION ................................................................................................. - 5 -

    REGIONAL GEOLOGY ................................................................................................................................ - 6 -

    SUBSURFACE CONDITIONS ...................................................................................................................... - 6 -

    Landslide Conditions ............................................................................................................................ - 7 -

    Bedrock Conditions .............................................................................................................................. - 8 -

    Groundwater ........................................................................................................................................ - 8 -

    SEISMIC HAZARDS .................................................................................................................................... - 9 -

    CONCLUSIONS AND RECOMMENDATIONS ................................................................................................ - 10 -

    GENERAL ................................................................................................................................................ - 10 -CHELTON DRIVE LANDSLIDE ACTIVITY ................................................................................................... - 10 -

    SLOPE STABILITY ANALYSIS .................................................................................................................... - 11 -

    EARTHQUAKE-INDUCED LANDSLIDE POTENTIAL ................................................................................... - 12 -

    SEISMIC DESIGN CRITERIA...................................................................................................................... - 12 -

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    RYAN GEOLOGICAL CONSULTING, INC.PROVIDING LOGICAL GEOLOGICAL SOLUTIONS

    16 Southwood Drive

    Orinda, Ca94563

    510-520-5592

    ENGINEERING GEOLOGY GEOLOGIC HAZARD ASSESSMENT HYDROLOGY GEOTECHNICAL ENGINEERING

    DRAINAGE GALLERY CONDITIONS ......................................................................................................... - 13 -

    SLOPE INCLINOMETER MONITORING .................................................................................................... - 13 -

    LIMITATIONS .............................................................................................................................................. - 14 -

    REFERENCES ............................................................................................................................................... - 15 -

    LIST OF FIGURES

    FIGURE 1VICINITY MAP

    FIGURE 2SITE PLAN

    FIGURE 3CROSS SECTION A-A

    FIGURE 4AERIAL PHOTO INTERPRETATION

    FIGURE 5REGIONAL GEOLOGIC MAP

    FIGURE 6 - REGIONAL LANDSLIDES AND OTHER SURFACE DEPOSITS MAP

    FIGURE 7 - OFFICIAL EARTHQUAKE FAULT ZONES MAP

    FIGURE 8OFFICIAL SEISMIC HAZARD ZONE MAP, STATE OF CALIFORNIA

    FIGURE 911 RESULTS OF SLOPE STABILITY ANALYSES

    FIGURE 12SLOPE INCLINOMETER PLOT B-2A

    FIGURE 13RING SHEAR TEST RESULTS

    FIGURES 14ATTERBERG LIMITS TEST RESULTS

    FIGURES 15 AND 16PARTICLE SIZE DISTRIBUTION TEST RESULTS

    LIST OF APPENDICES

    APPENDIX ACORE LOGS (2013 study)

    APPENDIX BBORING LOGS, DAMES AND MOORE (1969)

    APPENDIX CDIGITAL PHOTOGRAPHS OF 2013 CORE SAMPLES

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    RYAN GEOLOGICAL CONSULTING, INC.PROVIDING LOGICAL GEOLOGICAL SOLUTIONS

    16 Southwood Drive

    Orinda, CA 94563

    510-520-5592

    ENGINEERING GEOLOGY GEOLOGIC HAZARD ASSESSMENT HYDROLOGY GEOTECHNICAL ENGINEERING

    December 1, 2012

    Job No. 1082.100

    Mr. Edward De MeloC/O BERDING WEIL

    2175 N California Blvd, Suite 500

    Walnut Creek, California 94596

    Attention: Mr. Chad T. Thomas

    Subject: DRAFT

    Landslide Investigation Report

    Chelton Drive Landslide

    Chelton Drive and Girvin Drive

    Oakland, California

    Dear Mr. Thomas:

    INTRODUCTION

    This report presents the results of our subsurface investigation of the Chelton Drive Landslide located

    between Chelton Drive and Girvin Drive in Oakland California. The Chelton Drive Slidewas named

    during the late 1960s following failure of the hillside beneath Chelton Drive. Herein we will use the

    phrase Chelton Drive Landslide to be clear as to the site conditions. The Chelton Drive Landslidewas

    mapped covering an area about 260 feet wide at the head scarp along Chelton Drive and extended

    about 320 feet downslope to Girvin Drive at the toe of the landslide mass. The approximate site

    location is shown on the Vicinity Map, Figure 1, and the approximate landslide limits are shown onFigure 2.

    We previously conducted a preliminary engineering geologic review for Lot 2344 of the Piedmont Pines

    development which is located at the base of the Chelton Drive Landslide along Girvin Drive. The review

    focused on available geotechnical reports specific to Lot 2344 and landslide records at the City of

    Oakland. The results of the review were summarized in our report dated December 1, 2012. The study

    revealed that Lot 2344 was located at the base of a historically active deep-seated bedrock landslide

    that additional without stabilization would preclude the safe development of Lot 2344 or any of the

    surrounding lots.

    LANDSLIDE HISTORY

    The first reported indications of massive landslide movement occurred in April 1967. Chelton Drive

    dropped as much as 10 feet over a period of about 1 week as the landslide slid downslope. Significant

    damage resulted from the April 1967 landslide causing closure of Chelton Drive and forcing the

    evacuation of 2 homes located within the landslide limits. The City of Oakland restored access through

    Chelton Drive by placing fill on the top of the landslide mass and lowering the adjacent street grades.

    In January 1969, the landslide mass began to show signs of additional movement along Chelton Drive.

    This episode of landslide activity included up to 13 feet of movement over a 1-month period. The two

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