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AMERICAN ENGINEERING TESTING, INC. AET Project No. 22-00012 <br /> locate public underground utilities, and Hance Utility Services to locate private underground <br /> utilities on this site. <br /> We drilled the outside borings using 21/4-inch inside diameter hollow stem augers. We drilled the <br /> inside borings with hand augers, after coring through the concrete floor slab. We drilled the <br /> borings designated with an "EP" under environmental protocol; the drill rig, augers, drill rods, <br /> and samplers were steam cleaned at our shop before mobilization,and the samplers were washed <br /> in Alconox solution and rinsed with water between samples. A representative from Liesch was <br /> on the site as we drilled to perform environmental screening of the "EP" borings, and to obtain <br /> environmental soil samples. A representative from Liesch also environmentally screened soil <br /> samples from the"ES"borings after the samples were returned to our laboratory. <br /> We backfilled the boreholes with soil cuttings to comply with current Minnesota Department of <br /> Health regulations. Refer to Appendix A for details on the drilling and sampling methods, the <br /> classification methods, and the water level measurement methods. <br /> 4.2 Laboratory Testing <br /> The recovered samples were returned to our laboratory where we visually/manually classified <br /> each sample based on texture and plasticity in accordance with the Unified Soil Classification <br /> (USC) system. Data sheets describing the USC System, and the descriptive terminology and <br /> symbols used on the boring logs are included in Appendix A. <br /> We performed water content tests of selected cohesive samples collected from our borings. The <br /> results of the water content tests are shown on the respective boring logs opposite the samples for <br /> which they were performed. <br /> Page 5 of 28 <br />