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Geotechnical Investigation Hemet Mop Line C, Stage 4 Storm Drain Whittier Avenue Hemet, California

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Geotechnical Investigation Hemet Mop Line C, Stage 4 Storm Drain Whittier Avenue Hemet, California GEOTECHNICAL INVESTIGATION HEMET MOP LINE C, STAGE 4 STORM DRAIN WHITTIER AVENUE HEMET, CALIFORNIA PREPARED FOR: Attention: Joseph Caldwell, P.E. ALBERT A. WEBB ASSOCIATES 3788 McCray Street Riverside, California 92506 PREPARED BY: INLAND FOUNDATION ENGINEERING, INC. 1310 South Santa Fe Avenue San Jacinto, California 92583 October 31, 2011 Project No. W175~068 INLAND FOUNDATION ENGINEERING, INC. Consulting Geotechnical Engineers 1310 South Santa Re Avenue San Jacinto, California 92583 (951) 654-1555 I I FAX (951) 654-0551 l October 31, 2011 Project No. W175-068 Attention: Joseph Caldwell, P.E. ALBERT A. WEBB ASSOCIATES 3788 McCray Street Riverside, California 92506 Re: Geotechnical Investigation Hemet MOP Line C, Stage 4 Storm Drain Whittier Avenue, Hemet, California Dear Mr. Caldwell: We are pleased to submit the results of our geotechnical investigation for the referenced project. This investigation was conducted in general accordance with our proposal dated January 5, 2011. The results of our investigation indicate that the proposed storm drain project is feasible from a Geotechnical Engineering standpoint. Our report includes design recommendations along with the field and laboratory data. We appreciate the opportunity of being of service to you on this project. If there are any questions, please contact our office. Distribution: Addressee (4) TABLE OF CONTENTS SCOPE OF SERVICES ................................................................................................... 1 PROJECT DESCRIPTION ............................................................................................... 3 GEOLOGIC SETTING ..................................................................................................... 4 SUBSURFACE CONDITIONS ....................................................................................... 1 0 CONCLUSIONS AND RECOMMENDATIONS .............................................................. 13 Overall Feasibility ..................................................................................................... 13 Expected Soil Types to Be Encountered .................................................................. 13 Sand Equivalent Values and Soil Density ................................................................ 14 Soil Compressibility, Preliminary Soil Strength ......................................................... 14 Water Soluble Sulfates ............................................................................................. 15 Rippability Concerns ................................................................................................. 15 Trenching and Shoring Considerations .................................................................... 15 Protection of Existing Facilities ................................................................................. 15 Allowable Bearing Pressure ..................................................................................... 15 Lateral Earth Pressure ............................................................................................. 16 Coefficient of Friction ................................................................................................ 16 Unit Weight ............................................................................................................... 16 Pipe Design E' .......................................................................................................... 16 Settlement. ................................................................................................................ 16 Shrinkage and Subsidence ....................................................................................... 16 Corrosivity ................................................................................................................. 17 Applicability/Feasibility of Jetting On-Site Materials ................................................. 17 Earthwork/Backfilling ................................................................................................ 17 GENERAL ...................................................................................................................... 19 REFERENCES .............................................................................................................. 20 APPENDICES · APPENDIX A- Field Exploration ..................................................................... A-1 - A-13 Explanation of Logs ................................................................................................ A-2 Exploratory Borings ..................................................................................... A-3- A-12 Site Plan ............................................................................................................... A-13 APPENDIX B- Laboratory & Soil Mechanic's Testing ...................................... B-1- B-12 Analytical Testing ................................................................................................... B-3 General ................................................................................................................... B-3 Maximum Density-Optimum Moisture Determinations ............................... B-4 and B-5 Classification Testing ................................................................................ B-6 and B-7 Direct Shear Testing .............................................................................................. B-8 1 TABLE OF CONTENTS Consolidation Testing ...................................................................... B-9 through B-11 Expansion Testing ............................................................................................... B-12 APPENDIX C- Closest Distances Between Site and Fault Ruptures ......................... C-1 APPENDIX D- Soil Corrosivity Evaluation- HDR I SCHIFF ...................................... D-1 2 I. SCOPE OF SERVICES This investigation was performed to determine engineering characteristics of the subsoil conditions and to develop recommendations for the design of a proposed storm drain. Our investigation included field exploration, laboratory testing, engineering analysis and the preparation of this report. Our investigation was performed in general accordance with our proposal dated January 5, 2011. The storm drain project is known as Riverside County Flood Control and Water Conservation District's Hemet MOP Line C, Stage 4 Storm Drain. The RCP storm drain will be located along Whittier Avenue from a point approximately 150 feet east of Palm Avenue to a point approximately 100 feet east of San Jacinto Street. Preliminary site plans prepared by Albert A. Webb Associates were used as a reference during this investigation. Limitations: Our investigation was conducted for Albert A. Webb Associates and Riverside County Flood Control and Water Conservation District for their use in the design of the proposed storm drain. This report may only be used by Albert A. Webb Associates and Riverside County Flood Control and Water Conservation District for this purpose. The use of this report by parties or for other purposes is not authorized without written permission by Inland Foundation Engineering, Inc. Inland Foundation Engineering, Inc. will not be liable for any projects connected with the unauthorized use of this report. Scope of Services: The purpose of the geotechnical investigation was to provide geotechnical parameters for design and construction of the proposed project. The scope of the geotechnical investigation included: );:> A review of the general geologic conditions and specific subsurface conditions of the project site. );:> An evaluation of the engineering and geologic data collected for the project. );:> Preparation of a formal report providing geotechnical conclusions and recommendations for design and construction. );:> The tasks performed in order to achieve these objectives included: • The collection and review of data in order to develop an exploration program. • Subsurface exploration to determine the nature and stratigraphy of the subsurface soils, and to obtain representative samples for laboratory testing. Geotechnical Report- MDP Line C, Stage 4 Project No. W175-068- October 2011 1 Inland Foundation Engineering, Inc. • A visual reconnaissance of the site and surrounding area to ascertain the existence of any unstable or adverse geologic conditions. • Laboratory testing of representative samples in order to establish the classification and engineering properties of the soils. • Analysis of the data collected and the preparation of this report presenting our geotechnical conclusions and recommendations. The information in this report represents professional opinions that have been developed using that degree of care and skill ordinarily exercised, under similar circumstances, by reputable geotechnical consultants practicing in this or similar localities. No other warranty, either expressed or implied, is made as to the professional advice included in this report. Geotechnical Report~ MDP Line C, Stage 4 Project No. W/75-068 ~October 2011 2 Inland Foundation Engineering, Inc. II. PROJECT DESCRIPTION The RCP storm drain will be located along Whittier Avenue from a point approximately 150 feet east of Palm Avenue to a point approximately 100 feet east of San Jacinto Street. The site is relatively planer and slopes to the west at an overall gradient of approximately one percent. r 1 0 ... \ ~ ~ z ' l U.S.G.S. Topographic Map, Hemet 7.5' Quadrangle and Aerial Photograph
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