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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 standazds 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 requued. 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 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 disturbed sampling of the soil or rock is acceptable. <br />2.2 Number and Locations of Pits and/or Borinss. The spacing, locations and <br />depths of pits, trenches, or borings shall be in accordance with the provisions of Exhibit A; <br />j "Minimum Requirements for Spacing and Depth of Pits and Borings for Sampling Soils and <br />,. Rock." <br />2.3 ' Soil and Rock Material Properties. The soil material properties of <br />significance aze texture (grain size distribution), Atterberg limits, Plasticity Index, Expansive <br />Index, organic content, and relative densityand/or consistency. The rock material properties. <br />include color, texture, degree of weathering, hazdness, and geologic name. The soiUrock <br />material properties are useful for classification and as index properties, or indicators, or <br />correlation with the physical behavior properties. They aze used to reduce the need for the <br />more complex and costly engineering (physical) properties tests and must be identified, by <br />formal laboratory test or by visual-manual estimate, and described for every soil deposit <br />found in the subsurface investigation. <br />3. Report Content. <br />3.1 Introduction. Must include the same information required in a Level l report. <br />3.2 Project Location and Description. Must include the same information <br />required in a Level 1 report. <br />3.3 Site Investi ag tion. <br />3.3.1 Development of the investigation. (Include who specified it and why <br />the investigation was done in the manner it was done <br />3.3.2 Scope of field work. (Include how many test pits/test borings were <br />made, what type, and where.) <br />3.3.3 Drilling, sampling, and field testing program and methods; <br />ASTM/AASHTO references. <br />3.3.4 Laboratory testing program (samples tested; procedures used, ASTM <br />references). <br />Administrative Order - 9 <br />r.~adminord W I es102geotech 1 ao.wpd(09/05/02) <br />