hillshade map by their “faceted” appearance. Movement directions of the lobes of the deposit are <br />shown on the maps with arrows. <br />However, it must be pointed out that GeoScience’s mapping within the PUD is based not only on <br />LiDAR interpretation but also on observations during a visit to the PUD property in March of 2014. <br />At the time, the PUD plans were in the very earlystages, and the layout of the PUD was as yet <br />unknown. However, observations were made both of trees and exposures of the local rock (Eugene <br />Formation) on the east-facing steeper slope in the eastern part of the proposed PUD property. <br />In the areas shown as slope movements on the accompanying figures, coniferous trees are either <br />affected significantly by movement or are absent, which can, in itself, be an indicator of movement. <br />Whereas trees are affected by different types of movement, the effects for the different movement <br />types aredifferent. Simple soil creep, caused by shrinking and swelling of expansive soil in this area <br />generally results in long, sweeping downslope bends of the trunks as the base of the tree is rotated <br />downslope and responds. <br />In this case, many of the conifers (where present), show alternating bends in multiple directions (up-, <br />down-, and side-slope) within single trunks. Examples of such deformation are shown in the site <br />photos in Appendix A. Such deformation is typically associated with sliding movements of smaller <br />portions of the slope. As the soil moves in smaller increments, the trees growing in the moving area <br />are rotated, and then, when movement stops, the trees compensate for the rotation of the trunks. If <br />the movement is too severe, the tree is killed, either by falling or disruption of its root system. It is <br />notable that larger fir trees are relatively sparse in the steep areas on Lots 15, 16, and 17 and the <br />adjoining “preservation area”. Trees are much denser on portions of Lots 13 and 14, which, <br />according to the geomorphology are located in an area not recently affected by slope movements (see <br />site photos). In those areas the trees show deformation attributable to soil creep only. <br />In-place Eugene Formation is exposed in cuts made for both Capital Drive and also for the front yard <br />of the residence at 2808 Capital Drive, located immediately S of the PUD property. At the latter <br />location, the Eugene Formation consists of a fossiliferous (pelecypod-, or clam-fossils) fine- to <br />medium-grained sandstone dipping eastward at a shallow angle. <br />Given these observations on and near the site, it is apparent that there are at least two lines of <br />evidence (geomorphic and tree evidence) that much of the east-facing slope of the ridge has been, <br />and likely is, subject to slope movement (landslide) in the very recent geologic past. <br />INADEQUATE AND BIASED ASSESSMENT AREA <br />Given the plethora of evidence of existing large-scale slope movements both in the immediate <br />vicinity as well as within the proposed PUD, it appears that a thorough investigation and definition <br />of these movements would be appropriate to satisfy the requirements of both EC 9.6710 and EC <br />9.82320 (6). EC 9.6710 (4) and (5) require that subsurface exploration be conducted in all Tentative <br />PUDs where the slope exceeds 10%. The applicant did perform some subsurface exploration using <br />shallow backhoe or trackhoe test pits. In all, Branch Engineering excavated 10 test pits, the locations <br />4 <br />Capital Hill PUD Geotechnical Review, GeoScience, Inc. 3/7/18 <br /> <br />