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Borehole Log February 13 - 14, 1996
FEMME 1DG • Project: 1996 FCRIIX;a1ME BEND LANDSLIDE SZLIDY Boring No.: PBS-2 Sheet 1 of 2 GPS baring iocation: h4 )i8 i6o &4,1//,/IA CSS boring eievaticc: 156.1' Drillers: A. Parra with iuw air rig Drilling company: Layne mrcvircoreatal Services Drilled ca: 2/L3-14/96 Geology logged by: R. Gook Depth Litbic Description (feet) log 0- c, Vitt ide debris (0 to 95') u to .2' Graveiiy sandy clayey silt; soft; moist; light yellowish brown. 10- -o. _•= P .U 20- = 23' Clayeper; less most; yellow broom. - v= . 30- . 32 to 68' Clayey, silty, sandy gr ; contains gyps md; ; yellow brawl. a-e :re *- C 40- -6 _ = A.. = • 50- a� c.• 60- 60' It most . a= a c. 70- �� 68 to 90' Paleoeal; clay-rich; very moist; very dark brain. _ ."i� . / 80- / © 85'5`'gotrdantl slims bentcaitapfragments of fine gravel Sire. 90- c 90 to 95' Clayey silty sandy gravel; ]fight olive bran. 95.5' be 95.5 livto 1 . m 100- y lassinated siltstc e; meditm soft to media bard; dark gray to oe gray�_I E102' Softer. :, 110- ,-.- 110' bard. 115 to 117' Bentonite• �,,�,,�,,tic to fine-grained; gray =, 117 to 121' Siltstooe; tti�ly laminated; slightly dolomitic; Ssh scales; .re nodules; light to dark gray. 120- t=. 119 to 121' Minor ester. BOREHOLE LOG PBS-2, Sheet 2 of 2. S. depth lithic Description (feet) log 120- -- 121 to 124' Thinly laminated siltstone and bentonite; dark to very dark gray. - — 124 to 186' Portuguese Tuff (bentonite); varies from waxy to sandy; blue gray. 130- 1111 Scattered fine-grained pyrite. 2- 140- .. 150- 160- 170- • 50-160-170- ' 175 to 178' Hard siliceous siltstone and fine-grained sandstone clasts (?) within tuff; scattered pyrite; very dark gray. 1111 J 178 to 186' Bentonitic tuffaceous sandstone; lacks visible bedding; medium soft; 180- dark gray. 186' Probable base of Portuguese Tuff. 186 to 190' Dolomitic siltstone and fine-grained tuffaceous sandstone; thin j= bedded; hard; dark gray. 190- Total depth 190 feet. Two-inch threaded PVC installed to 115 feet. Perforated from from 75 to 95 feet. ID