8110 LARIMER RD 2016-01-01 MF Import

GeoTesl Services, Inc. 81101anmer Road, Everett, WA Generel Site Practices March 22, 2007 Job No. 07-0153 With respect to general site practices, which will help to maintain or increase the levels oF stability on subject slope, we make the following recommendations: It is critical that proper drainage be maintained in order to sustain current levels of stability '.vithin the subject lot. Regular maintenance of the storm water collection system should be performed at least two times a year, as well as aher any large storm event or sign of slope movement. No collected drainage water nor incident surface water should be allowed to discharge directly onto the slope, but should be tied into a suitably designed drainage structure. To reduce ihe possibility of initiating, rene�ving or increasing instability in the slope, in no case shouid water be allowed to flow over the steep slope. Establishing and maintaining the healthy vegetation cover on the slope wili best control long term erosion. We recommend maintaining the existing vegetation, and/or the introduction of additional native plant species lo provide long-term erosion protection and to increase slope stability. A landscape architect oi �ther qualified individual should be consulted in order to provide types and sources for suitable native plant species, which will help in soil stabilization on the slope while remaining low to the ground lo preserve current and future view opportunities. � Yard waste or other deleterious material should not be placed on or over the slopes. Such material smothers vegetation, retains water, and acts to destabilize the slope. • The slope should be regularly evaluated for signs of instability. Any evidence of slope movement, or change in drainage or vegetation patterns, should be promptly addressed. Some downslope movement of surficial soils should be considered a normal part of the weathering process for the slope, ar,d this behavior should be expected to con!inue. Limitations Our conclusions are based on visual observations during site visiis on tvtarch 9, 2007, review of av�iiable geologic informa:ion, and our experience in the area. Our study area included the subject slope at 8110 Larimer Road, as referenced in this report, only. Our services have been performed in a manner consistent with that level of professional care and skill exercised by other members of the professional communiry practicing under similar conditions in the area. No warranty, expressed or implied, is made. Within the limitations of scope, schedule and budget, our services have been executed in accordance with generally accepted site evaivation practices in this area at the time lhe report was prepared. It should be understood that the opinions presented in this report apply to the static case only, and are not intended to apply to all conceivable possibilities, such as effects resulting from a large magnitude earthquake. Paye d of 5