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Aft <br /> W -DIU1713 <br /> LOG , BOREHOLE 850 <br /> Geologic Logging J. Copland, SA I C, Pleasanton, CA Date Dr i I I ed : 9/28/90 <br /> Borehole Location Approximately 8 Feet south of tank Ground Water . Water not was encountered. <br /> excavation U850-D1U1, Building 850 Area, Site 300 Sampling Methods 2-inch I . D . split-barrel sampler advanced by <br /> Borehole Orientation 23 From vertical ,- bearing N30'E a 190 pound weight Fa I I i ng 30 inches . <br /> 1 <br /> Coordinates (Cal Gr i d) - N: 926, 301 . l; E 1, 695, 761 . 1 Arrows show locations of sampling . <br /> t i ca I Notes Benzene, ethy I benzene, to I uene, and xylenes <br /> Elevation (ground) 1333 . 71 Feet Ana l y <br /> it r <br /> Dr i I I i ng P . Baker, P . C . Exploration, Inc . , Roseville, CA were not 1 dent 1 F 1 ed %.'I n so o rock samp I es From 23 and <br /> ' Dr i I I i ng Method 6 . 25- inch hollow stem auger, 0-33 Feet 33 Feet above a detection limit of 0 . 0005 mg/k g. <br /> BackFi I led with grout, 3-27 and 30-33 Feet Recovery histograms show percent recovery and inFerred recovery locations. <br /> - - t d and F i nes are F i e ( v i t i mates. <br /> Back F i I I ed with bentonite, 0 . 5 3 and 27 30 Feet Estimates mates of grave I s, san s, d sua ( es ma <br /> TPH <br /> % Core as Analytical soil samples JIT E <br /> Depth recovery OVA diesel P 3 0 <br /> 0 100 Blows (ppm) (mg/kg) VL i tho I ogy L i tho I og i s descriptions and/or remarks <br /> o —— (0-0.5) GRAVEL [GP] baserock For road; Fill <br /> -- <br /> .., � (0.5_25) QUATERNARY COLLUVIAL SEDIMENTS <br /> _ <br /> 5 (0.5-3) CLAYEY SILT, [ML], brown, dry medium stiFFmoderate estimated <br /> ®;® permeability; lower contact From Borehole 850-D1U141 <br /> ' _® (3-23) SILTY SAND, ISM], brown, medium dense, Fine grained, low to to moderate estimated permeability <br /> cuttings indicate brown and tan below 13 Feet <br /> 15 <br /> damp, dries tan, and moderately sorted below 18 Feet <br /> 7/13/18 0 5 ®e <br /> 20 <br /> W 116=12" 0 12 = ® _ (23-33.5) TERTIARY SEDIMENTARY ROCKS <br /> (23-33.5) SILTY SANDSTONE, grayish brown, well indurated, Fine grained <br /> W 100=5" analytical sample at 29 Feet is From cuttings <br /> 30 3 P <br /> W 150=6" 9 29 = _ = slight diesel odor at 32 Peet <br /> D-3 . <br />