3005 PANAVIEW BLVD 2016-01-01 MF Import

July 10,1997 5 973-1164 Colluvium was found in Station 3 below a depth of four feet and in Station 4 ^ below a depth of three feet. The mlluvium in Station 3 mnsisted of a mmpact, moderate yellowish brown,silty marse to fine sand with some coarse to fine gravel and a trace of organics and wood debtis. The mlluvium enmuntered in � Station 4 was a]ayer of marse to fine gravel with some silt and coarse to fize sand. Water was preaent in Station 4 at a depth of approximately three-and-a- half feet. We believe that a colluvium layer mantled the slope prior to the slope failure. � Fill-Fill is a generic term used to classify soils that have been placed by humans, typically for the purpose of aite grading and mnstruction Fill cam m�sist of on- aiEe uaterial that has been cut and regraded,or oHsite(imported)materiaL Standarde for the placement of fill for construction purpases require that it be mmpacted to assure ib ability to support structurns and if placed on a slope, pmperly benched or keyed inlo the slope in order to assure stability. � We observed Fill at the crest of the main scarp at Station 5 at a depth of six ' inches. The fill mnsisted of loose :o compact,dark yellowish brown,silty coarse to fine sand and gravel with abundant roob and rootlets and wood debris. � Several claets of the underlying till unit wern also found mixed with the fill. The ' Sll material along with mlluvium made up most of the material involved in the mud/debris failure. Them was not a aharp oontact between the fill with the ` � underlying Recessional Outwash,but we estimate the thickness of the fill at the ' crest of the slope to be about four to five feet. ' Mud/Landslide Debris-Mud/Landslide Debris material is soil and organic debris that was involved in the rncent slope faIlure. This material includes all soils that have moved downslope,and may mntain a mixture of rnlluvium,fill and native soils. The debris was saturated at the time of slope movement The debris flow material was found at the surface in the lower portioiu of the ` body of the alide. Thia material was also found at Station 3 to a depth of four feet , and in Station 4 to a depth of two feet. The debris flow material consisted of loose,dark yellowish brown,medium to fine sandy clayey silt to silty medium to ' fine sand,some coarse to fine gravel and abundant organic and wood debris. At a depth of ttvo to three feet in Station 4 we enmuntered a layer of what appeared to be an older mud/landslide debris]ayer since there wern signs of ' ' vegetation between the old and new mud/landslide debris deposits. Minor groundwater seeps wern observed in the mud/debris in the lower portion of the slide at Station 4. The approxunate geologic mnhcts in the slide area are shown in Cross Section B-B'on Figure 2. • " Golder Associafes