624 MAULSBY LN 2018-01-02 MF Import

November 20, 2006( HWA Project No. 2006-000-21, Task 84 SITE 013SERVATIONS On November 14"i, 2006, our geotechnical engineer, Bryan Hawkins, P.G., under the responsible charge of Steven E. Greene, L.G.G, perl'ornmd a geological assessment, site reconnaissance including limited soil probing, examination of slope features, review of available geologic maps, and conducted discussions regarding site history with the owner. The existing residential structure occupies approximately 2,842 square feet (roof coverage) in the eastern portion of a 21,166 square foot lot. The existing house consists of a single -story structure with a full basement. The basement extends about 5 to 6 feet below existing ground surface. No signs of cracking, settlement, movement or other distress were observed in the foundation of the house. The top of an old rotational slide scarp was observed about 46 to 60 feet from the western side ofthe house, extending the full length of the property from north to south. Based on conversations with the homeowner, the slide occurred in 1968 and no movement has been observed since. The headwall of the scarp varies in height from about 4 feet at the north property line to about 10 lect in the middle of the property and to the south. It appears that when the slide occurred, a portion of the backyard at the top of the slope, about 10 feet wide, rotat d downward. The top of the slumped area is still relatively level and vegetated with grass. The exposed face of the scarp is now vegetated with terns and weeds. Probing the scarp face revealed soil consisting predominantly of sand and gravel (Advance Outwash). The steep slope drops down to the west to the BNSP Railroad track and West Marine View Drive beyond. The slope is heavily vegetated with blackberry bushes. A row of deciduous trees exists at the toe of the slope, east of the railroad tracks. No surficial evidence of tension cracking, or other distress was observed at the surface in the yard between the house and the top of the slope. No groundwater seeps or surface water erosion features were seen on site, and the existing house showed no apparent signs of settlement or foundation distress. There are no distinct signs of recent movement (aller 1968) on the hill slope and the upper surface soils along the slope were found to be Finn at shallow depth, 1y picall within i to 2 feet, when probed with a 3-foot long, -inch diameter, steel T-handled bar. Probing immediately west of the existing concrete patio, to the west of the house, revealed about 12 inches of medium dense topsoil over dense sand and gravel. Probing along the top of the slide scarp revealed about 27 inches of loose to medium dense topsoil over dense sand and gravel. In the vicinity of the northwest addition, probing indicated loose soil to at least 3 feet in several areas. This is likely in the area of loose backtill placed around the house after the excavation for the basement was made. In this regard, we recommend that foundations Muirhead Geologic Hazard Assessment 3 HWA GcoSciences inc.