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Mr. Aaron Sanchez August 4, 2022 <br /> Foundation Inspection Pag e 12 <br /> 2216 Grand Avenue <br /> Everett, WA <br /> ----------- <br /> GEOLOGICAL SETTING AND SOILS <br /> The geologic setting in this area is comprised of deposits of sand, cobbles, and clay defined as <br /> Vashon Drift Till of the early Pleistocene (USGS. National Geologic Map Database), According to <br /> DOGAMI, the site is considered a low landslide hazard and is relatively flat. <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 /> comprised of gravelly sandy loams. This soil has a moderate infiltration rate and a moderate rate <br /> of water transmission. Alderwood-Urban land complex has a low shrink-swell and is considered <br /> non-plastic with a maximum Plasticity index of 5. <br /> It is our opinion that the settlement is a result of improper foundation drainage and/or undersized <br /> foundations. We believe that a suitable support can be achieved by installing steel helical piles. <br /> Based on the site conditions, a full geotechnical report is not necessary. <br /> OBSERVATIONS <br /> Vegetation around the residence consists primarily of grassy areas with some small to medium <br /> shrubs, and a small tree by the front porch. The residence does not appear to have a sprinkler <br /> system. The surface grades on the north,west, and south sides of the residence appear adequate <br /> to drain water away from the foundation. The surface grade on the east side of the residence <br /> appears to be relatively flat. No areas of ponding water were observed on any side of the <br /> residence. <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 grade beam 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 July 19, 2022 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 along the north exterior wall of the <br /> residence. Negative elevations referenced are below the basepoint, and positive elevations are <br /> higher than the basepoint. The lowest point was recorded near the northwest corner of the <br /> residence. The high point was recorded along the south exterior wall. The elevation differential <br /> between the low and high points of the residence was found to be about 2 Y4 inches. These <br /> elevations are shown on the attached Foundation and Elevation Assessment Plan (SK-1). <br /> RECOMMENDATIONS <br /> We recommend a total of seven (7) steel helical piles be installed at the residence. Pile locations <br /> are shown on the Foundation and Elevation Assessment Plan (SK-1). The steel piling system <br /> used should have an evaluation service report (ESR) recognized by [CC-ES showing compliance <br /> with the currently adopted International Building Code (IBC). The steel piling system should also <br /> have a minimum allowable working load of 25 kips and be capable of uniformly raising the <br /> foundation as applicable. The minimum installation torque is 7,000 ft-lbs. <br /> _77 <br /> P,O Rox 10393 Fugene, OR, 97�'02/ 541.393.7363 VVWW.NWENGGR0UP.00M <br />