1910 MERRILL CREEK PKY 2018-11-15

Intracorp E-3592-520 .. September 23, 1998 Page 4 This report has been prepared for specific application to this project only and in a manner consistent with that level of care and skill ordinarily exercised by other members of our profession currently practicing under similar conditions in this area for the exclusive use of Int�acorp, and their representatives. No warranty, expressed or implied, is made. This report, in its entirety, should be included in the project contract documents for the information of the contractor. Slooe Evaluation The site slopes down to the north, east and southeast. The north slope ranges from twenty (20) to thirty (30} feet high and has a gradient of less than 2H:1 V. The east slope has a gradient of 2H:1 V and is on the order of seventy (701 feet high. The southeast slope has a gradient of about 1.5H:1 V and is about seventy (70► feet high. The 1.5H:1 V slopes were constructed during the mass grading of the Seaway project during the summer of 1996. The slopes were constructed by excavating into the dense to very dense native soils. This slope inclination was selected during design of this project in order to provide a stable slope based an the soil conditions. At the time of our field exploration, we did not observe indications of slope movement on the 2H:1 V or 1.5H:1 V slopes. Construction Setbacks The City of Everett Environmentally Sensitive Areas regulations requires a twenty-five (25) foot setback buffer from the top of slopes with gradients of 40 percent or steeper. This would include the 2H:1 V and 1.5H:1 V graded slopes on the east and southeast sides of the site. With the very dense nature of the excavated slopes and the improved drainage conditions at the top of the slope, the buffer can be reduced. In our opinion, it should be feasible to extend pavements and walkways to within two feet from the crest of the 2H:1 V and 1.5H:1V slopes. Buildings should maintain a top of slope setback of ten (10) feet. Site Preparation and General Earthwork We anticipate grading operations will primarily consist of placing building and pavement area fills and installing underground utilities. Building and pavement areas should be stripped and cleared of surface vegetatian, organic matter and any other deleterious material. In no case should stripped materia{s be used as structural fill or be mixed with materials to be used as structural fill. Earth Consuhanta, Inc.