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collector streets and all building structures except one and two family dwellings, garages, <br /> ' I carports, and outbuildings for one and two family development. <br /> Small Project: Examples of small projects aze: (a) a utility excavation no more than <br /> F five (5) feet deep and less than 300 feet long; and (b) road reconstruction, rehabilitation, <br /> widening, or extension of less than 300 feet of road in an azea with established infirastructure <br /> (roads, utilities). Small projects can also include sidewalk construction in an area with <br /> <br /> ~ established infrastructure. <br /> Soil Description and Classification: In the Eugene/Springfield azea, soil units aze <br /> Quaternary in age (younger than 1.64 My). Soil units include fluvial deposits (alluvium) and <br /> slope deposits (colluvium). PDS (Partly Decomposed State) and CDS (Completely <br /> Decomposed State) rock, although exhibiting characteristics of a soil, should not be <br /> classified as a soil unit for the purpose of geological and geotechnical investigation and <br /> design reports. Soil materials are described and classified on the basis of ASTM or <br /> AASHTO tests for the following properties: origin: whether residual, colluvial, or <br /> transported; gradation: measured or estimated grain size distribution; angularity/roundness <br /> <br /> ~ ~ of visible soil particles; color; measured or estimated in-place moisture content; Atterberg <br /> <br /> ~ limits: liquid limit, plastic limit, plasticity index of the -40 Fraction; relative density if non- <br /> plastic or below the plastic limit; consistency if above the plastic limit; Expansion Index; <br /> and, Unified Soil Classification System designation, determined by: gradation and Atterberg <br /> limits (ASTM D-2487, UBC 18-1 or equivalent) or the Visual Manual Procedure (ASTM <br /> D-2488 or equivalent). <br /> Soil Disturbance: Excavation and/or fill activities that displace the natural ground <br /> elevation by more than one (1) foot. <br /> ( Undisturbed Sample: A soil sample that has relatively unaltered in-situ particle <br /> structure and contains all of the soil components in their in-situ amounts, configuration, <br /> ~ orientation, and degree of saturation. <br /> E <br /> Uniform -Area: An area of land: <br /> (1) That has a single topographic feature (e.g. flat area, uniformly sloping. <br /> azea) without surface indications of changes in the subsurface (soiUrock stratigraphy, <br /> relative position of the water table); <br /> (2) For which published information indicates that rock and soil types <br /> ~ over the azea of the project have similar physical properties for purposes of design; <br /> 4 and <br /> (3) For which there is no significant vaziation in vegetation, such as, but <br /> . not limited to wet spots with sedges. <br /> Units: Rock-, Soil-, Fill-Units. Elements in the geologic stratigraphy of the site <br /> which affect the planning, engineering, and construction of the project. Units should be <br /> unequivocally identifiable in the field by qualified professionals and mapable at an <br /> ~ appropriate scale (e.g. 1" =10'). <br /> (1) A rock unit consists of a single rock type of similaz origin, which <br /> may be present in differing states of decomposition. The engineering properties of <br /> the various states of decomposition aze likely to be significantly different. In general, <br /> a decrease of weathering and increase in strength can be expected with depth within <br /> a single rock unit, although exceptions to this rule aze frequent; <br /> (2) A soil unit consists of soil materials naturally present at a site, with <br /> i <br /> Administrative Order - 3 <br /> r.\adminordlrules\02geotechl ao.wpd(09/05/02) <br /> <br />