4501 COLBY AVE 2016-01-01 MF Import

GeoTest Services,Inc. January 5.200i <501 Co�by Avenue,Everett,WA Job No 07-0026 Generel Site Practices With respect to general site practices, which will help to maintain or increase the Ieveis of stability on subject slope, we make the tollowing recommendations: � It is critical that proper drainage be maintained in order to sustain cuRent levels ot stability within the subject lot. Regular maintenance of the storm water collection system should be performed at least two times a year, as well as after any large storm event or sign of slope movement. As discussed above, 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 the possibility of initiating, renewing or increasing instability in the slope, in no case should water be aliowed to flow over the steep slope. • Establishing and maintaining the healthy vegetation cover on the slope will best control long term erosion. We recommend maintaining the sxisting vegetation, andlor the introduction of additional native plant species to provide long-term erosion protection and to increase slope stability. A landscape architect or other 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 to 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 soiis should be considered a normal part oi the weathering process for the slope, and this behavior shouid be expected to continue. Limitations Our conclusions are based on visual observations during site visits on January 19 and 22, 2007, review of avaiiable geologic infor,Talion, and our experience in the area. Our study area included the subject slope at 4501 Coiby Avenue, as referenced in this report, only. Our services have Geen pericrmed in a manner consistent with that ievel of professional care and skill exercised by other members of the professional community 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 generaliy accepted site evaluation practices in this area at the time the 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 appiy to all conceivable possibilities, such as effects resulting from a large magnitude earthquake. Aa e4of5 e �-� I �%; �� :