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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 are classified on the <br /> basis of origin, whether igneous (intrusive or extrusive) sedimentary (marine or terrestrial), <br /> pyroclastic, or metamorphic; geologic name; color and texture (grain size); hardness; 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 /> years 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 /> experience is especially qualified to apply geologic data, principles and interpretation to <br /> naturally occurring materials so that geologic factors affecting planning, design, construction <br /> and maintenance of civil engineering works are properly recognized and utilized. <br /> Representative Disturbed Sampling: Soil samples taken at the site that have been <br /> disturbed or altered, completely or partially, by the remolding action of sampling but which <br /> contains all of the soil components in their in-situ (original) amounts. <br /> Significant Structures and/or Facilities: All pavement structures for arterial and <br /> collector streets and all building structures except one and two family dwellings, garages, <br /> carports, and outbuildings for one and two family development. <br /> Small Project: Examples of small projects are: (a) a utility excavation no more than <br /> 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 area with established infrastructure <br /> (roads, utilities). Small projects can also include sidewalk construction in an area with <br /> established infrastructure. <br /> Soil Description and Classification: In the Eugene/Springfield area, soil units are <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 /> of visible soil particles; color; measured or estimated in-place moisture content; Atterberg <br /> limits: liquid limit, plastic limit; plasticity index of the -40 fraction; relative density ifnon- <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 /> <br /> Administrative Order - 10 <br /> <br /> R:\ADMINORDUtULES\03 geotech2ao.wpd(03/26/03 ) <br /> <br />