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Earth Engineering Cormultants.LLC <br /> EEC Project No. 1122096 <br /> Signal Resen oir ImproN�ements <br /> August 5.2015 <br /> Page 3 <br /> California barrel sampling procedures, standard sampling spoons are advanced into the ground <br /> by means of a 140-pound hammer falling a distance of 30 inches. The number of blows required <br /> to advance the split barrel and California barrel samplers is recorded and is used to estimate the <br /> in-situ relative density of cohesionless soils and, to a lesser degree of accuracy, the consistency <br /> of cohesive soils and hardness of weathered bedrock. In the California barrel sampling <br /> procedure, relatively undisturbed samples are obtained in removable brass liners. In conjunction <br /> with the California barrel and split-spoon samples, various composite samples of the overburden <br /> subsoils and underlying bedrock materials were also collected from the test borings for further <br /> laboratory analyses. All samples obtained in the field were sealed and returned to the laboratory <br /> for further examination, classification, and testing. <br /> Laboratory moisture content tests were completed on each of the recovered California barrel and <br /> split-spoon samples. In addition, the unconfined strength of appropriate samples was estimated <br /> using a calibrated hand penetrometer. Atterberg Limits and washed sieve analysis tests were <br /> completed to evaluate the quantity and plasticity of fines in selected subsurface samples. <br /> Additional laboratory testing procedures included moisture-density relationship/standard Proctor <br /> density (ASTM Specification D698), direct shear (ASTM Specification D3080) characteristics <br /> on the native subsoils and the underlying bedrock, and falling head permeability characteristics <br /> (ASTM Specification D5856) on the recovered bulk/composite samples. Results of the outlined <br /> tests are indicated on the attached boring logs and summary sheets. <br /> As part of the testing program, all samples were examined in the laboratory by an engineer and <br /> classified in accordance with the attached General Notes and the Unified Soil Classification <br /> System, based on the soil's texture and plasticity. The estimated group symbol for the Unified <br /> Soil Classification System is indicated on the boring logs and a brief description of that <br /> classification system is included with this report. Classification of the bedrock was based on <br /> visual and tactual observation of disturbed samples and auger cuttings. Coring and/or <br /> petrographic analysis may reveal other rock types. <br /> SUBSURFACE CONDITIONS <br /> An EEC field engineer was on site during the November 2012 and the supplemental June 2013 <br /> drilling operations to evaluate the subsurface conditions encountered and direct the drilling <br /> activities. Field logs prepared by EEC site personnel were based on visual and tactual <br /> observation of disturbed samples and auger cuttings. The final boring logs included with this <br />