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GEOTECHNICAL EXPLORARATION REPORT ROOSEVELT STREET IMPROVEMENT DISTRICT BUCKEYE, ARIZONA PROJECT # 150004 Prepared by: ATEK Engineering Consultants, LLC 111 South Weber Drive, Suite 1 Chandler, Arizona 85226 Exp ires 9/30/2018 December 14, 2015 December 14, 2015 ATEK Project #150004 RITOCH-POWELL & Associates 5727 North 7th Street #120 Phoenix, AZ 85014 Attention: Mr. Keith L. Drunasky, P.E. RE: GEOTECHNICAL EXPLORATION REPORT Roosevelt Street Improvement District Buckeye, Arizona Dear Mr. Drunasky: ATEK Engineering Consultants, LLC is pleased to present the attached Geotechnical Exploration Report for the Roosevelt Street Improvement Disstrict located in Buckeye, Arizona. The purpose of our study was to explore and evaluate the subsurface conditions at the proposed site to develop geotechnical engineering recommendations for project design and construction. Based on our findings, the site is considered suittable for the proposed construction, provided geotechnical recommendations presented in thhe attached report are followed. Specific recommendations regarding the geotechnical aspects of the project design and construction are presented in the attached report. The recommendations contained within this report are depeendent on the provisions provided in the Limitations and Recommended Additional Services sections of this report. We appreciate the opportunity of providing our services for this project. If you have questions regarding this report or if we may be of further assistance, please contact the undersigned. Sincerely, ATEK Engineering Consultants, LLC Expires 9/30/2018 James P Floyd, P.E. Armando Ortega, P.E. Project Manager Principal Geotechnical Engineer Expires 9/30/2017 111 SOUTH WEBER DRIVE, SUITE 1 WWW.ATEKEC.COM P (480) 659-8065 CHANDLER, AZ 85226 F (480) 656-9658 TABLE OF CONTENTS 1. INTRODUCTION ............................................................................ 1 1.1. Proposed Project ................................................................... 1 1.2. Purpose .............................................................................. 2 1.3. Scope of Services .................................................................. 2 2. FIELD EXPLORATION ...................................................................... 2 2.1. General .............................................................................. 2 2.2. Soil Test Borings ................................................................... 3 3. LABORATORY TESTING ................................................................... 3 4. GENERAL SITE CONDITIONS .............................................................. 4 4.1. Surface Conditions ................................................................. 4 4.2. Subsurface Conditions ............................................................. 4 4.3. Groundwater Conditions .......................................................... 5 4.4. Geologic Hazards ................................................................... 5 4.4.1. Liquefaction Potential .................................................... 5 4.4.2. Expansive Soils ............................................................. 5 4.5. Earth Fissures and Land Subsidence ............................................ 6 5. ENGINEERING ANALYSES AND RECOMMENDDATIONS ................................. 6 5.1. General .............................................................................. 6 5.2. Slopes ............................................................................... 6 5.2.1. General ...................................................................... 6 5.2.2. Permanent Slopes ......................................................... 7 5.2.3. Temporary Excavations ................................................... 7 5.2.4. Construction Considerations ............................................. 7 5.3. Earthwork ........................................................................... 8 5.3.1. Earthwork Grading Requirements (Roadway Embankment) ........ 8 5.3.2. Settlement .................................................................. 9 5.3.3. Trench and Pipe Bedding Mateerial ...................................... 9 5.3.4. Shrink/Swell Evaluation ................................................. 11 5.3.5. Borrow Requirements .................................................... 11 5.4. Excavation ......................................................................... 12 5.5. Corrosivity ......................................................................... 12 5.6. Pavement Areas ................................................................... 14 5.6.1. Asphalt Pavements ....................................................... 14 5.6.2. R-Value ..................................................................... 14 5.6.3. Resilient Modulus ......................................................... 15 5.6.4. Drainage Coefficient ..................................................... 15 5.6.5. Level of Reliability ....................................................... 15 5.6.6. Serviceability Index ...................................................... 15 5.6.7. Design ESALs ..................................E.xpires............ 9/3.0/2018............ ... 15 5.6.8. Structural Number and Design Thickness Recommendations ...... 16 5.6.9. Aggregate Base Course ................................................... 17 6. CLOSURE ................................................................................... 17 6.1. Limitations ............................................. ............................ 17 6.2. Recommended Additional Services ................ ............................ 19 APPENDIX A – Site Location Map APPENDIX B – Sample Location Plan APPENDIX C – Field Study and Boring Logs APPENDIX D – Laboratory Test APPENDIX E – Shrink/Swell Determination APPENDIX F – Subgrade Acceptance Chart APPENDIX G - Pavement Design Expires 9/30/2018 Geotechnical Exploration 150004 Roosevelt Street Improvement District Buckeye, Arizona Page 1 of 19 1. INTRODUCTIION This report presents the results of our geotechnical exploration for the Roosevelt Street Improvement District located in Buckeye,, Arizona. A Site Location Map is presented in Appendix A. The following sections of this report describe our understanding of the project and our scope of services. 1.1. Proposed Project The proposed project consists of sewer, water and street improvements along various locations within the City of Buckeye, Arizona. The sewer improvements will include the installation of three new lines: Roosevellt Road from Verrado Way west approximately one-quarter of a mile (8-inch diameter line), Roosevelt Road from Jackrabbit Trail west for approximately seven-tenths of a mile (15-inch diameter line) and 211th Avenue north for approximately seven-tenths of a mile from Van Buren Street north across Interstate 10 (12-inch diameter line). The water improvements will include the installatiion of three, 12-inch diameter lines: Roosevelt Road from Verrado Way west approximately one-half mile, 211th Avenue north for approximately four-tenths of a mile from Fillmore Street north across Interstate 10 and Dean Road north approximately one-half mile from Van Buren Street across Interstate 10. The street improvements will include seven segments: the north half of Roosevelt Road from Verrado Way west for approximately one-half mile, the south half of Roosevelt Street from Jackrabbit Trail west for approximately one mile, the west half of 211th Avenue from Roosevelt Street south for approximately one-quarter of a mile, the west half of 211th Avenue from McDowell Road south for approximately one- quarter of a mile, the north half of Van Buren Street from Dean Road to 211th Aveenue (approximately one-half mile), the south half of Van Buren Street from Dean Road Geotechnical Exploration 150004 Roosevelt Street Improvement District Buckeye, Arizona Page 2 of 19 west for approximately one-quarter of a mile and Dean Road from Van Buren Street north for approximately 1,000 feet. 1.2. Purpose The purpose of this geotechnical exploration was to evaluate the general surface and subsurface conditions at the proposed site, and to present recommendations related to geotechnical aspects of design and construction of the proposed project. 1.3. Scope of Services Our study included a site reconnaissance, subsurfface explorration, soil sampling, field and laboratory testing, engineering analyses, and preparation of this report. This report presents geotechnical recommendations for desiign and construction of proposed structures. The recommendations contained in this report are subject to the limitations presented herein. Attention is directed to the “Limitations” section of this report. 2. FIELD EXPLORATION 2.1. General The field exploration was performed on November 2, 2015 and November 3, 2015. Twenty-three soil borings were drilled to depths ranging between five (5) and thirty (30) feet below existing grade. The soil test borings were drilled using CME-45 power drill rig equipped with 6 and 5/8-inch outside diameter hollow stem augers. The borings were located in the field at the approximate locations shown on the Sample Location Plan included in Appendix B of this report. Geotechnical Exploration 150004 Roosevelt Street Improvement District Buckeye, Arizona Page 3 of 19 Prior to the start of drilling, the Arizona Blue Stake Center was contacted to locate existing utilities at the boring locations. Upon complettion of the borings, the boreholes