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j' EEC Project No.1212092 Earth Engineering Consultants,LLC <br /> November 23,2021 <br /> Page 2 <br /> estimating angles from identifiable site references. The approximate locations of the completed <br /> test borings are indicated on the attached boring location diagram.The locations of the test borings <br /> should be considered accurate only to the degree implied by the methods used to make the field <br /> measurements. Individual boring logs and a diagram indicating the approximate boring locations <br /> are included with this report. <br /> The borings were completed using a truck mounted, CME-55 drill rig equipped with a hydraulic <br /> head employed in drilling and sampling operations. The boreholes were advanced using 4'/a-inch <br /> inside diameter hollow stem continuous flight augers. Samples of the subsurface materials <br /> encountered were obtained using split-barrel and California barrel sampling procedures in general <br /> accordance with ASTM Specifications D 1586 and D3550, respectively, with additional bulk <br /> samples of the subgrade soils obtained from the auger cuttings. After completing the boreholes, <br /> temporary field slotted piezometers were installed in each of the borings for subsequent <br /> groundwater level measurements.After the subsequent readings were obtained,those piezometers <br /> were removed,and the boreholes were backfilled. <br /> In the split-barrel and California barrel sampling procedures,standard sampling spoons are driven <br /> into the ground by means of a 140-pound hammer falling a distance of 30 inches. The number of <br /> blows required to advance the split barrel and California barrel samplers is recorded and is used to <br /> estimate the in-situ relative density of cohesionless soils and, to a lesser degree of accuracy,the <br /> consistency of cohesive soils.In the California barrel sampling procedure,relatively intact samples <br /> are recovered in removable brass liners.All samples obtained in the field were sealed and returned <br /> to our laboratory for further examination,classification and testing. <br /> Laboratory moisture content tests were completed on each of the recovered samples. Atterberg <br /> limits and washed sieve analysis tests were completed on selected samples to evaluate the quantity <br /> and plasticity of fines in the subgrades.Direct shear tests were carried out on remolded samples to <br /> evaluate the shear strength parameters of the subgrades.Results of the completed laboratory tests <br /> are indicated on the attached boring logs and summary sheets. <br /> As part of the testing program, all samples were examined in the laboratory and classified in <br /> general accordance with the attached General Notes and the Unified Soil Classification System, <br /> based on the soil's texture, plasticity, and grain size distribution. The estimated group symbol for <br />