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<br />If either of the circumstances listed in 4.1 or 4.2 exist, a Level 3 analysis must be submitted. <br /> <br />R-9.6710-G Level 2 - Investi~ation Methods and Report Content. <br /> <br />1. Geolo~ic Investi~ation. A Level 2 investigation shall consist of: <br /> <br />1.1 A Level 1 investigation; <br /> <br />1.2 Subsurface investigation and testing to establish soil types and distribution, <br />based on representative disturbed sampling of soil and/or rock using dug pits or trenches, <br />hand augers, bucket augers, borings or other exploratory methods. The investigation shall <br />be designed to provide the following information (as applicable for the proposed <br />development): <br />1.2.1 Lateral/vertical distribution of soil and/or rock unites); and, <br />1.2.2 Classification and index properties of the soil and rock unites); and, <br />1.2.3 Location of static water level or piezometric surface (including <br />seasonal variation). <br />The subsurface investigation shall delineate design area( s) and determine the index properties <br />of the soil/rock to a sufficient depth below the structure or facility (see Exhibit A); and <br /> <br />1.3 A report that includes site and soil characteristics in relation to the proposed <br />development, identification of potential problems, and recommendations for design and <br />construction techniques and standards consistent with other standards applicable to the <br />development proposal. The investigation report shall classify all soil types encountered <br />using the Unified Soil Classification System (Exhibit B), AASHTO classification (Exhibit <br />C), or the Uniform Building Code Standard 18-1 (Exhibit D), and all rock types using an <br />engineering rock classification system. Classification shall be done by visual-manual <br />methods and confirmed by laboratory index properties tests of typical samples. Engineering <br />properties tests, field or laboratory, are not required. Water levels shall be observed in pit <br />excavations or borings. <br /> <br />2. Investi~ation Method. <br /> <br />2.1 Methods for Making Pits. Trenches. and/or Borings. Excavations for <br />sampling of soils/rock from below the surface may consist of pits, trenches, or borings, made <br />by hand or by machine. Any device, such as a backhoe, excavator, hand auger, machine <br />auger, thick wall tube, or vibrating tube that will permit excavation to the desired sampling <br />depth and allow access for representative disturbed sampling of the soil or rock is acceptable. <br /> <br />2.2 Number and Locations of Pits and/or Borings. The spacing, locations and <br />depths of pits, trenches, or borings shall be in accordance with the provisions of Exhibit A, <br />"Minimum Requirements for Spacing and Depth of Pits and Borings for Sampling Soils and <br />Rock. " <br /> <br />2.3 Index Properties of Soil or Rock. Significant index properties of soil include <br />texture (grain size distribution), Atterberg limits, Plasticity Index, Expansive Index, void <br />ratio, organic content, and relative density and/or consistency. Significant index properties <br />of rock include color, texture, degree of weathering, hardness, and geologic name. Index <br />properties are to be identified, by laboratory tests or by visual-manual method, and described <br />for each soil unit found in the subsurface investigation. <br /> <br />Administrative Order - 16 <br />R:\ADMINO RD\RULES\03 geotech2ao. wpd(03/26/03) <br />