1607 EDGEMOOR LN 2016-01-01 MF Import

� Earth Consultants Inc. C I/ 11 �l/ �� (Kr1VY�I1�lllilll]I}{IIIIY`A.(BYIIU�1\6RIi11\'IfIXTIN`I11ilIMlIY1�WG D � � � � d � January 14, 1997 �pN Q � �ggp � E-7548 ............................................................. CITY OF EVERETT Mr. Mel Konsmo Bldg. Permit Counter 15219 - 14"' Drive Southeast Mill Creek, Washington 98012 Subject: Keystone Wall Recommendations Carlson Residence Edgemoor Lane near pover Street Everett, Washington Dear Mr. Konsmo: As requested, we are pleased to present this letter providing recommendations for the planned Keystone wail. In preparing this letter, we met with you at the subject site to observe the general site conditions and calculated geogrid lengths and verticai spacings for the wall. This letter presents the results of our observations and analyses. We understand it is planned to construct a Keystone wall along the west side of the driveway at the subject site. Most of the wall will be less than four feet in height; however, in an area planned to provide an automobile turn-around, the wall will be eight to ten feet high. The wall will be situated near the top of a relatively steep slope. The slope is about thirty (30) feet high and has a gradient on the order of 30 to 40 percent. In the area of the turn-around, the slope has been covered with spoils from the house foundation excavation. This fill was cast over the slope and is susceptible to sliding. This fill should be removed as soon as possible and in no case should be left above or below the proposed Keystone wall �ocation. In our opinion, the Keystone wall can be constructed generally as planned. Where the wall height will exceed four feet, the wall will need to be reinforced with a geogrid. For walls up to eight feet high Tensar UX1400, or approved equivalent, should be used. For walls greater than eight feet in height, Tensar UX1500, or approved equivalent, should be used. The geogrid spacing and length should be in accordance with the following table: 1805•136ih Place N.E.,Suite 201,Bellewe,Washington 98W5 Betlevu2(206)643-3780 Seaitle(206)464•1584 FAX(206)74•608-60 Tacoma(206)272-6608