5010 SOUND AVE 2018-01-02 MF Import

.Sivardctrnm Residence Geologic al ;Issessment Report 5010.SoundAvenue Everett. Washington Based on the density of the mapped glacially consolidated sediments and the apparent lack of ground water, the risk of liquefaction is negligible. Based on the encountered stratigr"phy, it is our opinion that any earthquake damage to the proposed structure, when foandcd on suitable foundation hearing strata, would be caused by the intensity and acceleration associated with the event and not any of the above -discussed impacts. Design of the project should be consistent with 2009 International Building Code (IBC) guidelines. For structural design purposes the subject property would be defined as Site Class C. Erosion Protection The natural, on -site soils contain a significant amount of fines and are considered to be very moisture sensitive and subject to crosioe from both sheet flow and channelized flow. Due to the gentle grades on the site the potential erosion hazard can be handled with standard construction best management practices. Alt approved erosion control plan should he provided and implemented. The plan must include, at a minimum, placement of a silt fence along the low point of the construction area on the north and cast sides of the site. The silt fence should be placed as per local municipal specifications and properly maintained. Soil stockpiles should be covered with plastic during periods of inclement weather. Areas stripped ol'vegetation during construction should be replanted, or otherwise protected, as soon as possible. Construction entrances should be rocked to minimize oll=site soil transport. Slope Setback The planned construction will be more than 75 feet from any critical steep slope area. The steep slope along the west side of the property is a maximum of 15 feet in height. As such, a 25 foot setback is more than adequate from the top of this steep slope and the planned construction will not have any adverse impact to this steep slope area. CONCLUSIONS AND RECOMMENDATIONS On the basis of our geologic research and field reconnaissan(,e the subject site is considered to be suitable for the planned development. There are no active landslide hazards within 200 feet of the property and there is no potential for landslide Ion -on from any adjacent properties or nearby slope areas. The planned construction is located more than 75 lcet away from the nearest steep slope area and is well outside of any setback requirements. Provided the contractor follows best management practices for erosion control and storm water drainage. the new construction will not have an adverse impact to any known geologically hazardous areas. Based on our geologic research medium dense to dense glacial deposits should be encountered which will provide excellent support Ibr the proposed addition. If fill soils are encountered they Gary A. r1imers. PLLC. 19532 12" Mow NE Shorclmc. N'n hinglon 98155.1106 206417-7040