This section will focus on key areas not clearly covered  elsewhere

1) Fatal Geologic flaws overlooked by the developer

One of the most compelling arguments agains the CHPUD is the likelihood that massive mudslides would be triggered by the disruptions. The clearcutting , the disruptive nature of building all the infrastructure and the dramatic increase in physical and geologic stress that  development demands. DOGAMI (Department of Geology and Mineral Industries) has mapped numerous apparent landslide features in the vicinity of the proposed Capital Hill PUD. This mapping is based partly on geomorphic expression of slope movements in the area and partly on field-verified reports of landslides which have occurred during over the last 200 years. The SLIDO (Statewide Landslide Inventory and Database for Oregon) map can be accessed online at: www.oregongeology.org/sub/slido/index.htm.

The first of two maps below illustrate the location of the PUD in satellite view (magenta) and the second map below is a same section with the location of the PUD imposed on a LiDAR map, showing the locations of high risk slide areas (yellow).

Information provided by The GeoScience Review capital Hill PUD presented by The Committee and available in full form in submitted testimony. See

The CHPUD includes two larger slope movements below it’s southeast portion and northeast corner. They are located less than 100' and 200' from the boundary of the PUD, respectively. Two smaller slides are indicated on SLIDO to be less than 150' from the PUD. It is interesting to note that the overwhelming number of landslides mapped in this area on SLIDO are located on east-facing slopes. The explanation for this phenomenon is “Dip-Slope Failure”.

The instability of the earth on the eastern slope of Capital Hill is dramatically enhanced by underground water flow from the upper slopes on the west side to lower elevations on the eastern slopes. Be2) The cross sections presented by the developer are distorted.

Below are three cross sections of the CHPUD site provided by the developers paired with plans provided by the developer. Like so many other things presented by the developer these cross sections are distorted to favor the developers point of view. The fourth drawing accepts the developers XY axis scale in the plan view of the development and applies it to the elevation (Z axis).  By the XY scale, Ribbon Trail would be 105’ below the high point of the development. It is in fact 150’ below the high point.  This distortion is designed to minimize the radicle slope of the eastern lots. The difference in the slope presented and the actual slope is 11degrees. All three cross sections  are distorted in the same way.