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If either of the circumstances listed in 4.1 or 4.2 exist, a Level 3 analysis must be submitted. <br /> R-9.6710-G Leve12 - Investigation Methods and Report Content. <br /> 1. Geologic Investigation. A Leve12 investigation shall consist of: <br /> 1.1 A Level 1 investigation; <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 unit(s); and, <br /> 1.2.2 Classification and index properties of the soil and rock unit(s); 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 /> 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 /> 2. Investigation Method. <br /> 2.1 Methods for Making Pits, Trenches, and/or Borings. Excavations for <br /> sampling ofsoils/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 /> 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 /> 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 byvisual-manual method, and described <br /> for each soil unit found in the subsurface investigation. <br /> <br /> Administrative Order - 16 <br /> R:\ADM INORDUtULES\03geotech2ao.wpd(03/26/03 ) <br /> <br />