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Earth Engineering Consultant~,UC <br /> EEC Project No. 1122096 <br /> Signal Resen oir Improvements <br /> August 5,2015 <br /> Page 2 <br /> throughout the existing configuration of the Signal Reservoir at locations as presented on Figure <br /> No. 1 — Test Boring Location Diagram included in the Appendix of this report, which were <br /> extended to approximate depths of 25 to 40-feet below existing site grades. This field <br /> exploration was completed in general accordance with our proposal dated October 22, 2012. <br /> The June 2013 borings were positioned along the existing Signal Reservoir dam alignment, <br /> (borings B-11 through B-15), and along the toe of the earthen dam embankment alignment, <br /> (borings B-16 and B-17), also as presented on Figure No. — Test Boring Location Diagram <br /> included in the Appendix of this report, which were extended to approximate depths of 15 to 35- <br /> feet below existing site grades. <br /> The purpose of this report is to describe the subsurface conditions encountered within the two (2) <br /> field explorations, (i.e., the ten soil borings completed in November of 2012, and the seven <br /> borings completed in June of 2013), analyze and evaluate the test data, and provide geotechnical <br /> recommendations concerning the design and construction for deepening the reservoir and <br /> modifying/improving the existing dam. <br /> EXPLORATION AND TESTING PROCEDURES <br /> The seventeen (17) boring locations were established in the field by EEC personnel using a hand <br /> held GPS unit referencing horizontal and vertical coordinates from the "Google Earth" image of <br /> Signal Reservoir, and by estimating locations from identifiable site features. The approximate <br /> locations for the total of seventeen (17) test borings, identified herein as B-1 through B-17, are <br /> presented on Figure No. 1 in Appendix A of this report. Ground surface elevations at each <br /> boring location were also determined by the project's hired surveyor sub-consultant and are <br /> recorded on the enclosed boring logs included in the Appendix of this report. The locations and <br /> estimated ground surface elevations of the total of seventeen (17) test borings should be <br /> considered accurate only to the degree implied by the methods used to make the field <br /> measurements. <br /> Fourteen (14) of the test borings were completed using a truck mounted, CME-55 drill rig <br /> equipped with a hydraulic head employed in drilling and sampling operations. Three (3) of the <br /> seventeen (17) test borings, due to access limitations, were completed by using a track mounted <br /> Geo-Probe drill rig. All of the seventeen (17) boreholes were advanced using 4-inch nominal <br /> diameter continuous flight augers. Samples of the subsurface materials encountered were <br /> obtained using split barrel and California barrel sampling procedures. In the split barrel and <br />