121 60TH PL SE 2016-01-01 MF Import

i r i r 0 Page: Three �HN i! Zi KSurficial soils along the sideslope above the catchbasin have �t y sloughed in response to wet soil conditions, and loss of sup- H 0 port at the base of the slope by catchbasin excavation. Slou- ch H ghed materials have been removed and fill has been placed in E Z the disturbed area, OH e No other evidence cf soil movement was encountered along the H M g embankment. z y Storm sewers convey most of the runoff generated upslope from the parcels to the base of the slope, and surface water which M perches on structural fill which underlies the building lots g y is conveyed to the northwest along a berm which follows the top of the embankment. A temporary overflow pipe has been in- stalled near the north corner of Lot 23, conveying this water Z H v, to the base of the slope. H O In Scotch broom has begun to colonize the sideslope, and grasses clover and trees have been planted along the berm adjacent to F; Brookridge Blvd. b} i� Soils exposed on the building lots were generally structural fill, with the exception of native loamy sand and gravel soil exposed near the southwest corner of Lot 19, and a mantle of loose, organic upper fill soils. Some water loosened soils _ were encountered in a footing excavation on Lot 23. 1 j Regional exposures in cut banks adjacent to the sites indicat that the lots are underlain by a thick sequence of outwash _ sand and gravel, 1 fir! I Native soil exposure in util. ►! excavation. S.W. Corner of L t 19. Note oxidized and stratified soils at base of rod. b J 0,97Y ANALY515 J i