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• • • i <br /> . ; <br /> { <br /> Colyn JN 12223 <br /> July 31, 2012 Page 2 ' <br /> i <br /> new addition can be founded on conventiona! foofiings (as the existing residence is), provided it is ; <br /> founded on dense giacial till. The footings can be designed for a bearing capacity of 2,000 psf. + <br /> Excavations deep as about 4 feet may be needed to reach competent glacial till. � <br /> � <br /> � <br /> i <br /> Based on Everett Municipal Code (EMC), Chapter 37.080, the western portion of the property within � <br /> at least 50 feet of the existing residence is nated as a otenfial Landslide Hazard Area because it j <br /> has a stope between 25 and 40 percent. However, in order to qualify as a Landslide Hazard Area ; <br /> per 37.080.1.b, a slope with such an inclination wouid also have 1) seep and springs, 2) immature � <br /> vegetation and/or 3) no vegetation. The slape to the west of the residence has no indications of � <br /> seep or springs and has mature vegetation. Therefore, the slope west of the residence has none I <br /> of the three qualifications. Thus, the siope west of the residence is not a Landslide Hazard Area � <br /> per the EMC. <br /> i <br /> Also based on the EMC Chapter 37.080, the western portion of the property within at least 50 feet i <br /> of fihe existing residence is noted as a potentia/Erosion Hazard Area because the slope is between ! <br /> 25 and 40 percent. Hawever, in order to qualify as an Erosion Hazard Area per 37.080,3.b, a s�ope ' <br /> with such an inclination wauld have fio also contain: 1) debris and mud flows, 2)gullying or rifling, 3) � <br /> immature vegetatian, or 4) no vegetation. The slope to fhe west of the residence has no indications <br /> of any of these four criteria in our professional opinion. Therefore, the slope west of the residence i <br /> is not an Erosion Hazard Area per the EMC. ;� <br /> I <br /> A geotechnical engineering consideration is excavations needed under or near existing crawl space <br /> footings. No excavations should be made within a 1:1 (H:V) line beneath the edge of an existing � <br /> footing without considerations being made. We understand that a consideration will be made <br /> where the western footing will be lowered to insta{I the new basement base excavation under the <br /> footing in sections of about 4 feet. Thus, only half of the western footing will be undermined at one i <br /> time. We believe that this consideration would also be very suitable where excavations fnr new � <br /> footings will be made within a 1;1 (H:V) of the existing northern and southern footings, i <br /> I <br /> l <br /> LIMITATfONS I <br /> The analyses, conclusions, and recommendations contained in this report are based on site ! <br /> conditions as they existed at the time of our site visit, If the subsurface conditions encountered � <br /> during construction are significantly different from those anticipated, we should be advised at once i <br /> so that we can review these conditions and reconsider our recommendations where necessary. � <br /> Unanticipated soil conditions are commonly encountered on construction sites. Such unexpected �_ <br /> condifiions frequently require making additianal expenditures to attain a properly constructed j <br /> project. I <br /> This report has been prepared for the exclusive use of the Dennis Colyn and his representatives for <br /> specific application to this project and site. Our recommendations and conclusions are based on <br /> the site materials observed and on previous experience with sites that have similar observed i <br /> conditions. The conclusions and recommendations are professional opinions derived in ' <br /> accordance with current standards of practice within the limited scope of our services. No warranty ' <br /> is expressed or implied. ; <br /> � <br /> -^ • � <br /> i <br /> GEOTECH CONSULTANTS,INC. � � �� I <br /> �� <br />