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0 • <br />Mr. Aaron Byrne <br />Site Inspection <br />2421 Rockefeller Ave <br />Everett, WA <br />GEOLOGICAL SETTING AND SOILS <br />November 17, 2021 <br />Page t-2— <br />The geologic setting in this area is comprised of deposits of mud, sand, pebbles, cobbles, and <br />boulders (Vashon Till, Pleistocene) (USGS National Geologic Map Database). It is our opinion <br />that the settlement is a result of improper foundation drainage and/or undersized foundations. We <br />believe that a suitable support can be achieved by installing helical piles. Based on the site <br />conditions, a full geotechnical report is not necessary. <br />Preliminary soil data was obtained from the Web Soil Survey from Natural Resources <br />Conservation Service produced by the United States Department of Agriculture. This soils survey <br />indicates that the primary soil at the residence is classified as Alderwood-Urban land complex, <br />which is primarily a gravelly sandy loam. This soil has a moderate infiltration rate and a moderate <br />rate of water transmission. Alderwood-Urban land complex has a low shrink -swell potential with <br />a maximum Plasticity Index of 5. <br />OBSERVATIONS <br />Vegetation around the residence consists primarily of grassy areas with some small to large <br />shrubs. The residence does not appear to have a sprinkler system. The surface grades on all <br />sides of the residence appear to be relatively flat. Areas of ponding water were observed on the <br />north side of the residence. The areas of ponding are shown on the attached Foundation and <br />Elevation Assessment Plan (SK-1). <br />Some evidence of foundation movement was observed during the inspection which is noted on <br />the attached Foundation and Elevation Assessment Plan (SK-1). The evidence consisted <br />primarily of cracks in the foundation, sheetrock cracks, doors out of plumb, and sloping floors. <br />Relative floor elevations were provided by Ram Jack West. The floor elevations were reportedly <br />taken on October 22, 2021 with a Ziplevel. The Ziplevel is a pressurized hydrostatic altimeter and <br />works by measuring the difference in elevations between the base unit and the handheld unit. <br />The basepoint was reportedly set to 0.0 inch and located near the center of the south exterior wall <br />of the residence. Negative elevations referenced are below the basepoint, and positive elevations <br />are higher than the basepoint. The lowest point was recorded near the center of the north exterior <br />wall of the residence. The high point was recorded in multiple locations near the southwest corner <br />of the residence and the basepoint. The elevation differential between the low and high points of <br />the residence was found to be about 4 inches. These elevations are shown on the attached <br />Foundation and Elevation Assessment Plan (SK-1). <br />RECOMMENDATIONS <br />I recommend a total of seven (7) helical steel piles be installed at the residence. Pile locations are <br />shown on the Foundation and Elevation Assessment Plan (SK-1). The steel piling system used <br />should have an evaluation service report (ESR) recognized by ICC-ES showing compliance with <br />the currently adopted International Building Code (IBC). The steel piling system should also have <br />a minimum allowable working load of 11.0 kips and be capable of uniformly raising the foundation <br />as applicable. The minimum installation torque is 2,500 ft-lbs. <br />P.O. Box 10393 / Eugene, OR, 97440/ 541.393.7363 / WWW.NWENGGROUP.COM <br />