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Geotechnical Exploration Report

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Geotechnical Exploration Report GEOTECHNICAL EXPLORATION REPORT SPURGEON PROPERTY CENTER POINTE 74 DEVELOPMENT ISLAND ROAD BRISTOL, TENNESSEE CLIENT: APPALACHIA DESIGN SERVICES REPORT DATE: AUGUST 23, 2018 FSE PROJECT NUMBER: 218359 August 23, 2018 Mr. Tim Kuykendall Appalachia Design Services 245 Birch Street Blountville, Tennessee 37617 RE: GEOTECHNICAL EXPLORATION REPORT SPURGEON PROPERTY CENTER POINTE 74 DEVELOPMENT ISLAND ROAD BRISTOL, TENNESSEE FSE NO: 218359 Dear Mr. Kuykendall: At your authorization, we have completed a geotechnical exploration of the above referenced site. The purpose of the exploration was to gather site and subsurface information from which to provide engineering recommendations concerning site preparation methods, foundation and pavement design and other construction considerations. The following report presents our findings and recommendations. Our services have been provided using the firms of Foundation Systems Engineering, P.C. (FSE), Construction Materials Laboratory (CML) and Mill Creek Construction. We have appreciated the opportunity to provide our geotechnical engineering and testing services. We offer our engineering and materials testing services as the project continues. If you have any questions regarding the information within this report, please contact us at your convenience. Sincerely, Foundation Systems Engineering, P.C. Nick Cross, E.I. George R. Cross, P.E. Staff Professional Geotechnical Engineer 8/23/2018 TN State No.: 104229 GRC/kjm TABLE OF CONTENTS EXECUTIVE SUMMARY ............................................................................................... 1 SCOPE OF SERVICES .................................................................................................... 3 PROJECT/SITE INFORMATION ................................................................................... 4 Project Description ................................................................................................................... 4 Site Description ........................................................................................................................ 4 SUBSURFACE DESCRIPTION ....................................................................................... 6 LABORATORY TESTING .......................................................................................... 7 Natural Moisture Content .......................................................................................................... 7 Atterberg Limits ....................................................................................................................... 7 Soil Gradation Testing .............................................................................................................. 8 Standard Proctor ....................................................................................................................... 8 RECOMMENDATIONS .................................................................................................. 9 Geotechnical Considerations ...................................................................................................... 9 Soil Fill ..................................................................................................................................10 Foundation Excavation - Observation/Testing .............................................................................11 Seismic Classification ..............................................................................................................11 Foundations (Friendship Dealership Building) ............................................................................12 Slab on Grade .........................................................................................................................12 Pavement ................................................................................................................................13 Construction Considerations .....................................................................................................14 GENERAL QUALIFICATIONS .................................................................................... 16 APPENDICIES .............................................................................................................. 17 Test Pit Location Plan Test Pit Observation Log Area Topographic Map Area Geology Map Lab Data Test Descriptions General Notes Geotechnical Exploration Report Spurgeon Property - Proposed Friendship Dealership Bristol, Tennessee EXECUTIVE SUMMARY The proposed project includes the construction of the new Center Pointe 74 Development on what is known as the Spurgeon Property. The development is proposed to include a Friendship Chrysler, Dodge, Jeep, Ram (CDJR) Dealership, a hotel, a medical office building, and two commercial buildings. The project site is located along Island Road in Bristol, Tennessee. A summary of our findings and recommendations is listed below. ¨ The subsurface conditions on the site were explored with the use of sixteen (16) soil test pit excavations. The approximate locations of the soil test pits are shown on the included Test Pit Location Plan. The test locations encountered residual soil and bedrock. ¨ The topsoil across the site varied from 0.5 to 8 feet in thickness at the test pit locations. At test pit locations TP15 and TP16 a deep layer of topsoil was encountered at 8 and 5 feet respectively. Deep topsoil deposits should be anticipated in the drainage feature that runs southwest to northeast, along the southern edge of the site. ¨ Residual soil was encountered at all of the soil test pit locations. The residual soil types generally included high plasticity clays and silts. The residual soil consisted of brown, tan, and red silty clay with iron staining, silt seams, and some chert with a stiff to soft consistency. The soil strength generally decreases with depth with a corresponding increase in moisture. ¨ Test Pit refusal was encountered at soil test borings TP3, TP4, TP5, TP7, TP8, TP12, TP13, and TP14 at depths between 7 and 16 feet, below the existing ground surface. Bedrock rock was encountered between, approximately, elevations 1797 and 1759 feet at the test locations. Unless rock was encountered the test pits were generally extended to approximately 16 feet in depth before being terminated. TP15 and TP16 were terminated at shallower depths. Ground water was not encountered. ¨ Based on our findings it is the opinion of FSE that the proposed structure can be supported on shallow foundations. Because residual soil shear strength decreases with depth with increasing water content, select undercutting of foundation excavations will likely be required to allow replacement of weak soils with suitable select compacted stone fill material. In excavated/cut areas of the building pad and paved areas, the upper 1 to 2 feet will require scarifying and recompaction. ¨ The Standard Proctor results on the site soil determined a maximum dry density of 82.6 pounds per cubic foot (pcf), a value less than the typically recommended minimum of 90 pcf. The soil will be moisture sensitive. If unstable during proofroll testing, the upper 1 to 2 feet may require removal and replacement with offsite soil. ¨ The test pits indicate that bedrock will be encountered in the proposed Friendship CDJR Dealership building area. ¨ The geotechnical engineer should observe and evaluate the site once grading has begun to assess for areas that may require undercutting of unsuitable soil and replacement with suitable compacted soil fill. 1 Geotechnical Exploration Report Spurgeon Property - Proposed Friendship Dealership Bristol, Tennessee ¨ Provided the subgrade preparation and earthwork operations are completed in accordance with the recommendations of this report, the planned construction can be supported on shallow foundations bearing on stiff soil. We recommend an allowable soil bearing pressure 2,000 psf be used for the design of the foundations. Concrete slabs- on-grade can be designed using a modulus of subgrade reaction (k) of 100 pounds per cubic inch (pci). An IBC 2012 seismic Site Class “C” is recommended for this site. ¨ This summary should be used in conjunction with the entire report for design purposes. The entire report should be read in its entirety for a comprehensive understanding of the items contained herein. The section titled “General Qualifications” should be read for an understanding of the report limitations. 2 Geotechnical Exploration Report Spurgeon Property - Proposed Friendship Dealership Bristol, Tennessee SCOPE OF SERVICES Item Description -USGS Topographic Mapping - Bristol, TN Quadrangle (1938 and 2004) -Geologic Mapping of Tennessee -2012 International Building Code Information -Historical Aerial Photographs - Google Earth (1997 to 2015) Reviewed -Proposed Conditions Plan drawing (drawing by Appalachia Design Services and dated June 8, 2018) -Proposed Conditions drawing (drawing by Appalachia Design Services and dated December 28, 2017) -Topographic features - Drainage patterns Site - Ground surface cover Reconnaissance - Surface improvements Observation for: - Exposed rock - Ground instability - Karst features - Soil test pits located in the field by FSE using conceptual site plan Soil Test Pit - Sixteen (16) test pit excavations Excavations - Observation of soil samples for type, consistency and moisture content - Backfilled test pit excavations with soil cuttings - Twenty-three (23) Natural Moisture Contents Laboratory Soil - One (1) Atterberg Limit
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