8709 10TH DR SE 2016-01-01 MF Import

Report Cronin Cusrom Homes � - luly 31, 1990 � Page 2 � 2. Provide evaluation of ihe slope st�;!��y and general guidelines ro maintain slopn stability. j 4. Pravide a written report outlining my conclusians and reccmmendations. i SITE CONDITIGhS � 7'he westem hillside slopes moderately ro scecply up fro��;� the site. The grades of the slope are � typically on the arder of 2:l (iiorizontai:venical). Vertical slope heighcs at this inclina:ion�'a:ied up IO ?n feet Local slope gradients were mcuured as steep as 75 percent, with a wtal venical height of 8 feec. Vegetation on the hillside consi;ts mainly of grus, berry vines and a few trees. One faidy large e:�zrgrcen and one large deciduous tree exists on the slope. The subsudace �� .iitions were explorecl at the site by exca+a[ing 4 iest pits a[ the base oi tha wesrern hillside. Tne tesr pits •+zre Iocaeed in the field by a subcontracted geologist who maintainul � decailed logs af�.ne ezplorations. "[l�e locations of the tes[ pic� are shown on U�e Site Plan, Fiyvre I. Logs oi che test pi�are;�resen[ed in Figures 2 thraugh 3. � Thz subsudace conditions observed in ihe test pi� indicare that d�z wre of thz hillside is ' composed of very dense glacial drife "I�e drift is a silty smd with gravel that was overriddzn by ice �, sheew on the o:der of 5000 teec thick. The drift is ma�erial iha[ wu transported at �he bate of the . glacier. It is differentiatc�.f from till in that some sorting indicates s[rearn action ac the baze of�ha glacier. "Ihe ruult of this sortine is intermittent sanil and sil[ lenses. Overlying the drifi the explorations encounte:�vl on the ordzr of I ro I.5 fe:[ af upper soils consisting of ineeii�•�m dense v:eathered drift and a loose cieposit ot root mass and tapsoiL [t appearrsi in some locacious that the upper ropsoll and highly wea�hered zone had been snipped off during put gcadinS. Groundwacer was not cbserved in ihe test pi�s. The drift is faidy impermeable and essentially will no[tranemit ground wa[er except in possible sand seams. Depending on the catchm�nt area above the slope, some perched wacer could exisc in me upper we�therzd anC topsnil zone durin; die e•erter ponions of the year. COUVRETTE GEDTECFLY:CAL L1CII'!EI'RL^1G �-- -- -- --- - —