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

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Soil Disturbance: Excavation and/or fill activities that changes the natural ground elevation of the site by more than one (1) foot. Undisturbed Sample: A soil sample that has relatively unaltered in-situ particle structure and contains all of the soil components in their in-situ amounts, configuration, i.e. initial void ratio; orientation; and degree of saturation, i.e. moisture content. Uniform Area: An area of land: (1) That has a single topographic feature (e.g. flat area, uniformly sloping area) without surface indications of changes in the subsurface (soil/rock stratigraphy, relative position of the water table); (2) For which published information indicates that rock and soil types over the area of the project have similar physical properties for purposes of design; and (3) F or which there is no significant variation in vegetation, such as, but not limited to wet spots with sedges. Units: Rock-, Soil-, Fill-Units. Elements in the geologic stratigraphy of the site which affect the planning, engineering, and construction of the project. Units should be unequivocally identifiable in the field by qualified professionals and mapable at an appropriate scale (e.g. 1" = 1 0'). (1) A rock unit consists of a single rock type of similar origin, which may be present in differing states of decomposition. The engineering properties of the various states of decomposition are likely to be significantly different. In general, a decrease of weathering and increase in strength can be expected with depth within a single rock unit, although exceptions to this rule are frequent; (2) A soil unit (also referred to as a "soil type") consists of soil materials naturally present at a site, with very similar index and engineering properties; and (3) A fill unit consists of material placed during previous construction activities at a site. A fill unit has similar index and engineering properties. Zone of Influence: That land area adjacent to vehicular access ways that includes the slope easement, the soil structure beneath the road foundation slope profile extended downhill, and the soil layer above the road slope profile extended uphill. R-9.6710-B Purpose. These Standards for Geological and Geotechnical Analysis describe the investigation and report content necessary to ensure that for planning review and approval, public and private facilities in developments in areas of known or potential unstable soil conditions are located, designed, and constructed in a manner that provides for the public health, safety, and welfare. It is a design professional's responsibility to ensure that the final project has sufficient geological investigation to design and construct the proposed facilities for long-term safety, structural stability and soundness. R-9.6710-C Applicability. 1. Except for the exemptions set forth in EC 9.6710(3), as reflected in R-9.6710-D, a geological and geotechnical analysis prepared by an Oregon licensed Certified Engineering Geologist or an Oregon licensed Civil Engineer with geotechnical experience is required for: Administrative Order - 11 R:\ADM INO RD\RULES\03 geotech2ao. wpd(03/26/03)