Admin Order 58-02-25-F - Laserfiche WebLink

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