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Engineering Properties of Soil and Rock: The engineering or physical properties
<br />of soil and rock depend 'on both the material, or grain, properties and their in-situ, or
<br />undisturbed, texture, packing, particle orientation, and degree of saturation. Sheaz strength
<br />compressibility, void ratio, permeability, and erodibility aze most often the engineenng
<br />properties of interest. The engineering characteristics taf an in-situ rock mass most often
<br />focus on discontinuities, such as bedding, shear zones, and fractures. Such features aze
<br />described in terms of frequency, attitude, spacing, roughness, bonding quality, and general
<br />continuity.
<br />Expansive Soil: Soils containing expansive clay minerals, such as, but not limited
<br />to, montmorillonite, which expands excessively when subjected to a moisture increase and
<br />which shrinks excessively when subjected to a moisture decrease. Soils identified in the
<br />Natural Resources Conservation Services soil manual as having a high shrink-swell potential
<br />shall be considered expansive soils.
<br />Indez Properties of Soil or Rock: The soil material or grain properties of the
<br />material itself, regazdless of the in-situ, or undisturbed, texture, packing, orientation, or
<br />degree of saturation. The soil material properties of significance aze the properties of the
<br />individual grains or particles, including the distribution of grain sizes, the shape, angularity,
<br />and hazdness of individual grains, the amount and type of clay minerals, and the presence and
<br />amount of organics. The rock material properties include color, texture, degree of
<br />weathering, hazdness, and geologic origin. The soiUrock material properties are used to
<br />indicate, or infer, potential engineering behavior.
<br />Intact Character of Rock: In the Eugene/Springfield area, rock units are Tertiary
<br />in age -between 1.64 million years (My) and 35 My old. Rock units aze classified on the
<br />basis of origin, whether igneous (intrusive or extrusive) sedimentary (marine or terrestrialj,
<br />pyroclastic, or metamorphic; geologic name; color and texture (grain size); hazdness; degree
<br />of weathering; and if available, degree of fracturing.
<br />Pistol-Butt (on Tree): Also called gun-stocked tree. A curved basal section of
<br />trunk, resulting from down-slope rotation of the base of the tree. Similar in shape to curved
<br />butts on antique side arms.
<br />Qualified Registered Professional: An Oregon Registered Professional .Engineer
<br />(per ORS 672.002 to 672.325), who by training, education, and having a minimum of four
<br />yeazs geotechnical experience, is especially qualified to apply the principles of soil
<br />mechanics, rock mechanics, hydraulics, and geological science to planning and evaluating
<br />engineering site investigations, making appropriate quantitative analyses and engineering
<br />design recommendations for that part of civil works involving the use of soil and rock
<br />materials and the inspection or testing of the construction thereof; and an Oregon Certified
<br />Engineering Geologist (per ORS 672.505 and 672..525), who by training, education, and
<br />expenence is especially qualified to apply geologic data, principles and interpretation to
<br />naturally occumng materials so that geologic factors affecting planning, design, construction
<br />and maintenance of civil engineering works aze properly recognized and utilized.
<br />Representative Sample: A soil sample taken from the site that has been disturbed
<br />or altered, completely or partially in-situ particle structure, by the remolding action of the
<br />sampling device but which contains all of the soil components in their in-situ amounts.
<br />Significant Structures and/or Facilities: All pavement structures for arterial and
<br />Administrative Order. - 2
<br />r:\adminord\rules\02geote ch l ao.wpd(09/05/02)
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