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Appendix B • • Appendix B Log of Borings of the 1996 Investigation • Table B-i. Summary of Locations, Surface Elevations, • Depth to Slide Base, and Thickness of Slide Base • PBS-1 to PBS-12 • B-96-i to B-96-18 • 1 • Table B-1 Geologic borings made during 1996 study of Portuguese Bend landslide. Summary of boring location surface elevations, total depth, depth and elevation of slide base, thickness between slide 4111 base and top of Portuguese Tuff, and top, thickness and base of Portuguese Tuff (all in feet). Slide Base Thickness P0rrtuguese Tuff Boring Coordinates Surface Total -Lagge3- - Slide base TopWick-$ase B $e Number -North East elev. depth Elev. deet_hh bent to Port. T de th ness depth elev. 'pm- ',;fr8 oii3' 78,ioO 179 '177- '- =."4. 1/5.2 34 27 7741- PBS-2 N4,018,166 54,177,724 156.1 190 60 95 96.1 28 124 62 186 -30 PBS-3 84,018,412 54,177,839 215.6 216.5 96 118 119.2 27 146 59 204.7 11 P85-4 N4,018,818 54,177,855 249.3 180 152 95.5 96.6 26 122 53 175 74 PBS-5 N4,019,248 54,177,948 287.8 181.7 201 85.3 87.0 27 114 58 172.2 116 P86-6 N4,019,632 54,178,109 310.2 190 222 88.5 86.2 42.5 131 58 189 121 P85-7 144,019,938 E4,178,274 298.6 141.6 269 29.3 - 48 77.5 58 135.6 161 PBS-8 N4,019,218 E4,178,254 281.2 168 209 71.5 72.3 29.5 101 64 165 116 PBS-9 N4,018,534 54,179,000 185.1 176 98 68.5 87.4 28.5 107 66 173 12 PBS-10 N4,018,350 54,178,218 170.4 212 44 126 126.5 30 156 53 209 -39 PBS-11 144,019,410 E4,179,029 279.5 112 (269) fill to 11 feet 34 45 64 109 170 P85-12 144,020,321 54,177,830 340.9 132 313 27.5 - 43.5 71 58 129 212 9611-1 N4,019,489 54,178,917 276.2 60 247 29 22.2 96W-2 N4,019,561 E4,178,837 279.2 50 247 ca.35 31.0 B96-1 144,018,750 54,178,946 190 68 150 40.5 B96-2 N4,019,458 E4,178,958 276 30 256 19.5 896-3 144,020,562 54,178,429 477.4 118 400? 77.8? 896-4 144,020,392 54,178,600 464.7 98 374 90.6 B96-5 144,020,245 E4,178,938 437.4 79 375 62 B96-6 144,019.998 54,179,066 433.5 108 353 80.5 896-7 N4,020,131 54,178,863 434.8 118 <317 >118 896-8 144,020,146 E4,179,012 436.7 70 375 62 896-9 144,020,482 54,178,763 454.0 65 401 53 896-10 144,018,866 54,178,720 185.1 38 158 27.1 B96-11 144,018,895 E4,178,597 186.7 30 162 24.8 896-12 144,019,950 54,178,393 293.5 14 283 10.5 896.13 N4,019,876 E4,178,474 289.3 16 279 10.3 896-14 N4,019,762 54,178,598 284.0 40 247 37 896-15 144,019,540* 54,178,460 312* 80 236 76 4111 896-16 144,019,714 E4,178,655 283.8 57 243 40.8 B96-17 N4,019,641 54,178,741 282.3 55 241 41 B96-18 144,019,377 54,178,730 291.8 70 228 64.2 Table Water level in feet below top of casing in above wells used for monitoring ground water. Date PBS-1 PBS-2 PBS-3 PBS-4 PBS-5 PBS-6 PBS-7 PBS-8 PBS-9 PBS-10 B96-12 277676 77.717 "grn 'l 0'7'x'5 7 TT -situ 72.= 'MUT 'any 3/18/96 76.44 94.53 102.64 74.24 69.14 48.69 1.22 dry 40.83 3/29/96 76.62 94.77 102.54 74.61 69.06 50.28 1.53 dry 41.11 75.04 8.82 4/19/96 77.34 93.76 102.58 75.16 69.04 52.17 1.75 dry 41.51 75.23 8.98 5/3/96 77.52 92.81 102.36 75.17 68.58 52.45 2.47 NM 41.64 75.64 9.26 5/28/96 77.87 90.74 102.16 75.57 65.31 52.80 3.21 dry 42.12 77.91 9.46 6/24/96 77.56 52.26 101.93 75.81 54.93 50.17 4.02 - 42.52 76.18 9.14 7/16/96 77.35 33.01 101.70 75.73 53.30 50.92 4.40 dry 42.71 74.44 8.92 8/2/96 77.05 29.10 101.19 75.73 53.64 51.38 4.57 - 42.89 69.38 8.94 8/26/96 76.94 27.42 100.56 75.59 53.28 51.70 4.78 - 42.98 56.81 8.95 8/30/96 - 27.38 - - - - - - - 55.44 - 9/16/96 - 27.29 - - - - - dry - - - 9/24/96 77.04 27.41 100.02 76.13 55.17 54.99 4.77 - 43.02 53.03 9.12 10/18/96 77.04 27.28 99.67 76.56 65.78 63.75 4.87 dry 43.00 51.67 11/19/96 77.16 27.79 99.31 77.23 66.47 53.25 5.03 - 43.08 50.39 - 12/20/96 74.41 28.44 98.10 77.48 63.42 53.34 4.64 - 40.93 49.47 1/20/97 73.42 28.19 96.47 77.36 68.48 50.54 10.81 - 38.25 49.11 3.48 2/22/97 73_17 26.82 95.59 77.23 67.76 48.28 2.22 - 36.23 48.93 2.02 1111 zrssa o; rssa • • BOREHOLE LOG • Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: PBS-1 Sheet 1 of 3. GPS boring Tocation:N O1$;OTEI ET,r7$ UO-- GPS boring elevation: 179.6' Drillers: A. Parra to—r7TTErwiTFAFTODTY air rig; E. Sanduval to 277 feet with CME 95 core rig Drilling company: Layne Environmental Services Drilled on: 2/6 to 13/96 Geology logged by: R. Crook; Dana Cole; P. Ehlig Depth Lithic Description (feet) log 0- ...:1-.. Landslide debris (0 to 175.4') . , —71 6-42 breccia; rock fragments in soft yellow brown (10YR5/4) matrix composed of fine ,Oisand, silt and clay; soft. 10- 2� ��G C•v 20- 417 /= . 30- !b • Asa ,(,74.- 40- ,7¢ 40- -,-G 42 to 115' clay; silty, sandy and gravelly; dense; dark yellow brown (10YR4/6) to very �, dark gray Brown (10YR3/2); some charcoal fragments at 58'; moist; appear to be lake beds. 'i 50- -,',-,- 1 III _. _I 7.:r-r_ 60- - —i c' J 70- _' 80- FF; Q 90- --- "E_ 100- =fl 110.- :V:- Q., 115 to 175' variable amounts of poorly sorted clay, silt, sand and gravel; gravel includes angular to subangular clasts of dolostone, chert and basalt; various shades .-;:_:.1 of yellow to orange brown (10YR5/4, 10YR5/6, 10YR6/6; moist; appears to be of bedded • 120- —: alluvial origin. Note: Log approximately the same same from 120 feet to base of slide at 175 feet; therefore not shown. CORE LOG PBS-1, Sheet 2 • Date Core Run Recovery Depth Graphic Dip Descriptive log and box in feet, in log of times % & base feet bedding 3.4/3.4 - p; Sheared bentonitic clay; yellow (5Y7/6) above slide base. 2/8/96 100% - ,o 1 1 175- --' S.B. 11 175.4' slide base; lineation plunges 10 degrees. - 1111 Altamir S7a- -beneath slide base; alternating light to 13:20 107.0 - Tark greenish--gray (N7 to 5Y4/1) beds 1 to 10 cm thick; 177.75' fine-grained sandstone bed; 3 cm thick; medium - dark gray (N4). 5.0/5.0 180- • B: 13 100% - Beds offset about 3 cm along steeply inclined shear from 14:25 1 2 182.0 - .-=, 178.0 to 183.0'. 5.0/5.0 185- 100% - 14:50 2 3 187.0 - 187.8' Bentonitic bed 5 mm thick. - �1 B: 9 -2 4 5.0/5.0 190- �. 100% - 15:25 192.0 - B: 10 Core fractured during drilling. 3 5 4.0/5.0 195- ,<�• ' 80% - --==! B: 17 16:15 197.0 - - .51--; B: 23 - � 3 & 4 6 4.4/5.0 200- i��' Core fractured during drilling. 88% 16:57 202 - B. 11 Mostly siltstone and fine-grained sandstone with a few 2/9/96 - eJs thin bentonitic beds. • - ! .s 1.3/5.0 205- ��� 27% - ; 10:00 4 7 207.0 - i-•"- -J 209 to 270.8 Portu nese Tuff 4.4/5.0 210- ` Bentonite; verye grained'; bedding-1 thin- beto make 88% - out; light to medium dark gray (N7 to N5); develops 12:20 4 8 212.0 - r:,61;_ , , closely spaced curved cracks as it dries. 83% - i;-J 149.0 - 1C -� 5.0/5.0 215- z(4 B. 20 215 to 227' core severely broken during drilling. 100% - 13:20 4 & 5 9 217 - 1�1 ' J ' 5.0/5.0 i----, 1 100% 220- J 15:15 5 10 221.0 16:01 5 11 0.6/1.0 222 - SJ--1 2/12/96 - r..--,1 Start 10:00 - L 1i 5 12 4.0/5.0 225- 80%.5 - i,. .-,i Bentonite becomes coarser grained; includes sandy beds. 12:57 227.0 - 1 6 13 2.6/2.6 s ' 13:30 229.6 - '•T�i 100% 230- !:! 14:00 6 14 232 - �t 231 to 232' swirled structure caused by soft sediment 2.5/2.5 - r'i B: 12 deformation. 100% - 'i�J".� 14:40 6 15 234.5 - 2.5/2.5 235- '��' 235.6 to 235.9' cross bedding in coarse sandy bebs. 100% -!:75.€ • 15:04 7 16 237.0 - 1::) Core broken during drilling. 240- . CORE LOG PBS-1, Sheet 3 of 3. Ash Date Core Run Recovery Depth Graphic Dip Descriptive log and box in feet, in log of Iiir times % & base feet bedding 7 17 5.0/5.0 240- Portuguese Tuff continued. 100% - .)k. Light gray bentonitic tuff (N7 to N6); sandy. 16:25 242.0 - 2/13/96 7 18 1.0/2.5; 40% - -�- Start 7:00 244.5 - •7\ 8 19 2.1/2.5 245- A. B: 7 84% 08:10 247.0 - - 8 20 0.5/2.5; 20% - Al 08: 249.5 8 21 2.5/2.5 250- ••� B: 17 100% - • 09:30 252.0 - .i-c-- 8/9 =8/9 22 2.5/2.5; 100% - B: 15 10:00 254.5 - - 9 23 2.0/2.5 255- B: 16 80% - �•�L 10:25 257.0 . 9 24 2.3/2.5; 92% - .r, Core broken during drilling. 10:45 259.5 - rJ- 9/10 25 2.5/2.5 260- �, 100% - l;7-- B: 15 11:12 262.0 aConglomeratic with mudstone rip-up clasts. 10 26 1.9/2.5; 76% - u 11:35 264.5 - V7i. 10 27 2.5/2.5 265_ 1, ) 100 i. 11 :55 267.0 - �, 10 28 2.5/2.5; 100% - 12:30 269.5 - 1�� 10/11 29 0.9/2.5 270- is 270.8' Base of Portuguese Tuff underlain by siliceous - 36% 13:15 36% - 1 siltstone; light gray granule conglomerate on slightly 272.0 - r-.; irregular surface above laminated to thin bedded (3 to 20 mm) medium gray to dark brownist gray siltstone - ',--...% Recovered chewed up fragments only. - 11 30 2.5/5.0 275- :moi° 50% i�. 15:30 277 - ��'� Total depth 277 feet. Inserted 2 inch PVC to 180 feet for use to determine depth of active slide plane and use for ground water monitoring. 1111 BOREHOLE IDG Project: 19% PORTUGUESE BEND TANfSLIDE STUDY Boring No.: PBS-2 Sheet 1 of 2 io GPS boring location: N4,018 16b E4,1//,/24 GPS boring elevation: 156.1' Drillers: A. Parra with. AY 100u air rig Drilling company: Layne Environmental Services Drilled on: 2/13-14/96 Geology logged by: R. Crook Depth Lithic Description (feet) log 0- landslide debris (0 to 95') u to 32' Gravelly sandy clayey silt; soft; moist; light yellowish brown. -d 10- V.= 20- 23' Clayeyer; less moist; yellowish brown. C5_. 30- . 32 to 68' Clayey, silty, sandy gravel; contains gypsum; dense; yellow brown. 40- tom- *tp- p 50- - r SSC 60- c 60' More moist G� - 68 to 90' Paleosol; clay-rich; very moist; very dark brown. 70- 80- :_� 84' Abundant bentonite fragments of fine gravel size. 85.5' Possible slide plane. oao- 90- 0 90 to 95' Clayey silty sandy gravel; light olive brown. 95.5' Slide base. 95.5 to 15 Thinly laminated siltstone; medium soft to medium hard; dark gray to 100- olive gray. 102' Softer. 110- 110' hard. 115 to 117' Bentonite; o�tic to fine-grained; gray. 117 to 121' Siltstone; thinly laminated; slightly dolomitic; fish scales; phosphate nodules; light to dark gray. • 120- 119 to 121' Minor water. BOREHOLE LOG PBS-2, Sheet 2 of 2. • 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- Scattered fine-grained pyrite. 140- 150- 160- 170- 175 to 178' Hard siliceous siltstone and fine-grained sandstone clasts (?) within tuff; scattered pyrite; very dark gray. 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 bedded; hard; dark gray. 190— Total depth 190 feet. Two-inch threaded PVC installed to 115 feet. Perforated from from 75 to 95 feet. BOREHOLE LOG • Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: PBS-3 Sheet 1 of 3. GPS boring Tocation: 018412—E 177 GPS boring elevation: 215.6' Drillers: A. Parra to reef-'wit1 T 0-011air rig; E. Sanduval 216.5 feetwiTh CME 95 core rig Drilling company: Layne Environmental Services Drilled on: 2/12/96 and 2/14-16/96 Geology logged by: D. Cole; R. Crook; P. Ehlig Depth Lithic Description (feet) log 0- .— ' Landslide debris (0 to 118') TopOT;yy 1Towish brown silty clay with rock fragments; becomes lighter colored with depth. _A! 10- 4'Z L1 20- Chi Q 30- il -I 40- Old alluvium with subangular rock fragments in a sandy, silty clay matrix; light yellowish brown (10YR6/4). 50- 60- Extensive chert fragments in material like that above. 70- J is C�0 Bentonite fragments in silty clay matrix. 80- Y 81 to 84' Bentonite; white to cream colored. 5j! 84 to 90' Breccia with abundant small sandstone fragments. 90- 1.<=_H 90 to 98' Rock fragments in a clay rich matrix; clay forms balls in drill pipe. 98- ; � Completed drilling to 98 feet with air hammer at 12:55 on 2/12/96 Date Core Run Recovery Depth Graphic Dip Descriptive log and box in feet, in log of times % & base feet bedding 2/14/9698- Landslide debris (to 118 feet) 1 1 3.0/3.0 - `J ' entonite; very fine-grained; unfractured; med. soft; 100% 7) 100- ) mottled in shades of pale yellow, orange, white and purple. • 13:27 101.5 _ j - � Bentonitic tuff containing volcanic granules and pebbles. - •A:= Gravel, rock fragments to 2" long in silty clay matrix; 105- a'y light yellowish brown. CORE LOG PBS-3, Sheet 2 of 3. • Date Core Run Recovery Depth Graphic Dip Descriptive log and box in feet, in log of times % & base feet bedding 1 2 5.0/5.0 105- ,.. , Gravel; sandy, silty, clayey matrix; lacks bedding; 100% - I co yellowish brown (2.5Y6/4). 13:55 106.5 - 6C - ...• - % 2 3 5.0/5.0 110- \' "same as above" 100% - c,3� 14:15 111.5 - 2 4 4.9/5.0 115- 4'. "same as above" 98% - i> 14:45 116.5 - i%f' - SB:15 118' Base Of slide; 0.1 inch stiff clay with slicks; 3 5 4.8/5.0 - gypsum seam below. 96% 120- {<% B:15 Siltstone with thinly interbedded ver fine-grained 15:15 121.5 - L!.% sandstone; dark gray to very dark gray (5Y4/1-3/1); - a a few fish scales and small phosphate lenses; gypsum - B:14 seams parallel bedding. 65.0/5.0 - 121.5 to 121.9' Bed of internally massive silty mudstone; 100% 125- black (5Y2.5/2); mod. hard. 15:37 4 126.5 - 126' Fracture inclined at 45 degrees. - 8:15 127.5' Sandstone bed 1.75 inches thick; fine-grained; - „i dark gray (2.5Y4/0). 7 5.0/5.0 - 128.6 to 129.0' Fine-grained sandstone bed; dark gray 100% 130- (2.5Y4/0) 16:05 131.5 - 130.5 to 131.5' Dolomitic siltstone; laminated; hard; gray. 5 8 4.9/5.0 - ,-- r�� III 98% 135- L/: B:18 16:40 136.5 136.7' 1.5 cm thick bentonite bed. 2/15/96 - %` 07:00 - '� Interbedded siltstone and mudstone; very thinly bedded; 5 9 4.1/5.0 - � , 82% 140- .•--! B:17-18 09:55 141.5 - - 1. 142' start of bentonitic claystone interbedded with - '''•" siltstone; may be reworked from Portuguese Tuff. rte. 145- -.-: Portuguese Tuff (146 to 204.7') 6 10 6.2/7.5 - .=J B:15 Very fine-grained bluish gray bentonite in upper part. 83% 12:15 149.0 - J 149 to 150' very waxy bentonite. 11 2.6/2.5 150- ,„-- 12:35 --= 12:35 104%,151.5 - dam: 151 to 152' soft sediment deformation in bentonite. - i,Ii, Sandy tuff continues downward to base of Portuguese Tuff. 12 5.0/5.0 - ;. I - 100% 155- ;•J B:17 13:45 7 156.5 - ; .- _ r` ! ; 13 5.0/5.0 - /J 100% 160- 14:15 161.5 - , -) . 14 5.0/5.0 - 164.5 to 165.7' soft sediment deformation. 100% 165- :7-t 14:54 8 166.5 - - ;�: White sandy tuff; bedding faint. • 15 5.0/5.0 - _. 100% 170- '=. 15:17 171.5 - '-N 171' slump structure (soft ediment deformation). CORE LOG PBS-3, Sheet 3 of 3. • Date Core Run Recovery Depth Graphic Dip Descriptive log and box in feet, in log of times % & base feet bedding 2/15/96 - �):j granule conglomerate with scattered pebbles resting on 8/9 16 5.0/5.0 - ` undulating contact on laminated chocolate brown organic- 100% 175- o �r rich mudstone. 172.2 to 175.4 graded beds 1.5 to 3 " thick 176.5 - �'•: alternate with dark organic rich beds up to 0.2" thick. 15:52 - v { 175.4 to 177.9' graded tuff bed with granules at bottom. - 1- .` B:16 178.7 to bottom at 181.7 sandy to pebbly lithic tuff; minor 9 17 5.2/5.0 - 1.'",-\-i bedding. 100% 180- 1-).'i 16:27 181.7 - ?_ - !--; 183.5 to 192.5 thick beds of white sandy tuff; scattered -9/10 18 5.0/5.0 J• ! pyrite. 100% 185- `!'Th 17:08 186.5 _ ') .' 2/16/96 10 19 5.0/5.0 -- !61 100% 190- ' ' 08:22 191.5 - 1-..) .1 10/11 20 %.0/5.0 - 100% 195- .-v.,. 09:22 196.5 - • FJ 11 21 5.0/5.0 - H-' 100% 200- '\ 09:40 201.5 - J-• _ . . III 11/12 22 5.0/5.0 - • ' 204.7 Base of Portuguese Tuff 100% 205- •J underlain by laminated siliceous siltstone. 10:15 206.5 - - r✓� B:12-16 12 23 5.0/5.0 - �..:-9 100% 210- •' 11:10 211.5 -_ !� ri 13 24 4.9/5.0 - 0 214.2 to 215.5' bentonitic lapilli tuff. 98% 215- i 11:38 216.5 - Laminated siltstone; dark brownish gray; organic rich. Total depth 216.5; 2" PVC pipe installed to below slide base. 1111 BOREBOIE LOG Project: 1996 PORTUGUESE BEM) IANC LIDE STUDY Boring No.: PBS-4 Sheet 1 of 2 • GPS boring location: N4,018 818 X4,1//,855 GPS boring elevation: 249.3' Drillers: A. Parra with Al? 1OUu air rig Diill.ing company: Layne Frivironmentai Services Drilled on: 2/8-9/96 Geology logged by: R. Crook and P.�g Depth Lim Description (feet0- 1,, Thndslide debris (0 to 96.6') /¢_' lock tragpents in a yellowish brown silty clay matrix. 'r: lo- Ua a•; 20- :',1 Q' 30- ao Pit 40- G - _';; 50- — 1 • 13 60- iN 70- r:c/778 to 86' Fine-grained, bentonitic tuffaceous sandstone; lacks visible ; 80- ."1: reddish yellow (7.5YR7/6) to pale yellow (2.Y18/3.5). . ,.V. ,\1-: 85 to 87' Slide plane; sheared clay; same silstone fragments; bentonitic tuffaceous sandstone below. =:= 88' Water. 90- '_ 88 to 91' Very hard siliceous mudstone; gray (7.5YRN6/); moderately fractured; brown stain on fractures. ' �`J 91 to 95' Thin beds of bentonitic tuff and tuffaceous sandstone with minor thin. *.71,..*- beds of siliceous mudstone; slternating light to orange to ellow. 95 to 96' Slide base; very stff brown clay enclosei g bentonite clasts. 100- 96 to 101' Thinly laminated siltstone and very fine-grained sandstone; dark l'=.--27--4gray; hard. - 101 to 107' Softer siltstone comes out in fragments up to 10 cm long; bedding I.::: flat. r-= 107' Hard; minor fine-grained sandstone. 110- r—_ 108' Thin bedded to laminated siltstone contains fish scales; chocolate brown to H•— Imo 7- 115 Same bentonite beds. -,• 119' Very hard sandstone layer. • 120- BOREHOLE LOG PBS-4, Sheet 2 depth lithic Description 4110 (feet) log 120- c:.=,..7- ,--....- • — 122 to 175' Po 7thff (bentonite); upper pp waxy becoadng more sandy and granular •nearar, medium blue •gray; taint bedding. 130- ...J-', l'.2z 140- ,J 150- J1 160- kd.- _G� . U 170- " - 175 to bottom at 180' Hard siltstone; dark gray. .J 180- " • Total depth 180 feet. Tao-inch threaded PVC installed to 100 feet. Holes drilling in casing from 70 to 90 feet. BOREHOLE LOG III, Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: PBS-5 Sheet 1 of 3. GPS boring o tion:I 613 gr—r I777§Wr— GPS boring elevation: 287.8' Drillers: A. Parra to7 with AP I lTlf air rig; E. Sanduval 79 to 182' with CRt 95 core rig Drilling company: Layne Environmental Services Drilled on: 2/19 to 23/96 Geology logged by: R. Crook to 79 feet; D. Cole 79 feet to bottom Depth Lithic Description (feet) log 0- i Landslide debris (0 to 85.3') c- U tom T lty sandy clay; slightly gravelly; stiff; brown. c// 10- /. I 20- !o I 1`-� 22 to 36' Bentonite; waxy; soft; light yellow. ) 30- '72- 1 .. 2` 36 to 40' Breccia; pebble to cobble sized clasts of siltstone in a bentonite 3 J 1 matrix. 40- IJ 40 to 63' Gravel in a sandy silty clay matrix; brown to yellow brown. \.-I s t U • 50- i /•a 1:U i)71--.60- ;�z=1 11 .1 { :--J 70- ! - 1 / t 80- 1 \ I Total percussion hammer depth 79 feet; set 5" conductor casing to 78' for coring. Date Core Run Recovery Depth Graphic Dip Descriptive log and box in feet, in log of times % & base feet bedding 2/19/96 1 1 2.5/2.5 80- Landslide debris 11:20 100% - �U anguT-r pelb5Te-sized rock fragments in a silty clay 81.5 - )v_ ) matrix; clasts various colors in shades of red, yellow 051 and gray; matrix is yellowish brown (10YR6/4). 2 4.5/5.0 - }�• 1 11:45 90% 85- r--.-,1 sheared bentonite 86.5 - 86.5' Slide base 3 2.5 �&-) Bedrock 12:05 100%,89.0 - ..7.7 T 1erbedded siltstone and mudstone; med. hard; yel. brn. 2 4 2.2/2.5 - beds 0.2 to 3" thick with dark chocolate brown clayey 88% 90- = organic-rich beds 0.1 to 0.4" thick; gypsum vein 0.1" 12:20 91.5 - - 9 thick cuts across bedding between 86.7 to 86.8'. _ Color gradually changing from yellowish to gray. ...„..„ ____...,, 95- - 10 CORE LOG PBS-5, Sheet 2 of 3. Date Core Run Recovery Depth Graphic Dip Descriptive log and box in feet, in log of times % & base feet bedding 2 5 5.0/5.0 95- .,-- 10 Bedrock (cont.) 12:40 100% - -,-,,r 96.5 - ;� - �..ii 6 5.0/5.0 - !i • 100% 100- %i'. 13:15 3 101.5 - - 103.8' undulating contact; lgt. gary fine-grd sandy bed I overlying chocolate brown mudstone. 7 5.0/5.0 105- ,_-1:1 100% _ -77-:-. 13:50 106.5 - �i ---- 8 5.0/5.0 110- % 100% - 1:-.:::14:30 4 111.5 - i 114' approximate top of Portu uese Tuff 9 4.9/5.0 115- !' 1:_, laminated waxy bentonite;med�gray. 98% 15:10 116.5 - E, - Lc .31 5 10 5.0/5.0 - i\�; 100% 120- @._, i 120 to 124' core broken during drilling. 15:55 121.5 - F=-,0 J - \i 5.0/5.0 - i--. : 124 to base of Portuguese Tuff at 172.2' 410 100% 125- {moi very light bluish gray sandstone becoming granule 16:45 11 126.5 i 6 - ,� � and pebble conglomerate (breccia) at depth. 12 5.0/5.0 -- :`` 100% 130- i T, 17:00 131.5 - �� 2/23/96 - i ,i 13 5.0/5.0 - I.V.! 100% 135- 3 11 7:46 136.5 - i' 14 4.8/5.0 - -.q 96% 140- ice: 8:48 141.5 - .J'' _ f• 15 5.0/5.0 - s 100% 145- ! . 9:25 146.5 - : '` i - 8 -- ' �f 16 5.0/5.0 ,,., 100% 150- ? /1 10:13 151.5 - 17 5.0/5.0 - jil 100% 155- - ± 10:52 9 156.5 - �3 i _ i- A-1 18 5.0/5.0 - 100% 160- i ' 11:22 161.5 CORE LOG PBS-5, Sheet 3 of 3 • Date Core Run Recovery Depth Graphic Dip Descriptive log and box in feet, in log of times %, base feet bedding 18 5.0/5.0 100% 160- 10 Portuguese Tuff (bentonite) continued. 11:22 161.5 - - 19 5.0/5.0 - .s 100% 165- 1�•�//: 12:05 10 166.5 - u; o s ; sandy to pebbly lithic tuff; bentonic; bluish gray. - Ja 20 5.0/5.0 - •• 100% 170- ala { 12:35 171.5 - 12:57 - °�f 172.2 base of Portuguese Tuff; 5 granule conglomerate with scattered pebbles resting on 10/11 21 5.0/5.0 - � undulating contact on laminated chocolate brown organic- 100% 175- • 1 7 rich mudstone. 172.2 to 175.4 graded beds 1.5 to 3 " thick 13:17 176.5 - 10 alternate with dark organic rich beds up to 0.2" thick. 13:32 - :% 175.4 to 177.9' graded tuff bed with granules at bottom. - 3 178.7 to bottom at 181.7 sandy to pebbly lithic tuff 11 22 5.2/5.2 - 100% 180- 13:55 181.7 - �� Total depth 181.7 feet 2" sched. 40 threaded PVC installed to 100'; perforated 60 to 80'; gravel packed to 52'. • BOREHOLE LOG Allh Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: PBS-6 Sheet 1 of 2 GPS boring Tocafion:— 21701 1159 GPS boring elevation: 310.2' Drillers: A. Parra witnAT�'3 ��'4 T7$6� air rig -trilling company: Layne EnvironmentaT Services Drilled on: 2/14-16/96 Geology logged by: R. Crook Depth Lithic Description (feet) log 0- Landslide debris (0 to 85.3') lrto 22•rSilty sandy clay; slightly gravelly; stiff; brown. 10- L. vo 20- �J L, 22 to 36' Bentonite; waxy; soft; light yellow. i` 30- "14 v 36 to 40' Breccia; pebble to cobble sized clasts of siltstone in a bentonite ° matrix. 40- a°= 40 to 63' Gravel in a sandy silty clay matrix; brown to yellow brown. R .a ,o• di; 50- ;%O j .aio .0/ • 4 57' Minor water. Ji 60- iE%• 63 to 74' Slightly gravelly, clayey sandy silt; light yellowish brown. 70- 74 to 77 Gravelly silty sandy clay; contains bentonite fragments; yellowish brown. 77 to 86' Slightly gravelly, clayey sandy silt; light olive brown. 80- J - 86 to 86.5' Bentonite and coarse gravel. 86.5' to 88.5 Sheared bentonite with black clay fragments. 90- -744 88.5' Slide base. 89 to 701-1651omitic siltstone; thinly laminated; hard; gray. 90 to 91' Bentonite; waxy; dark gray. Water at 91'. -=� 91 to 95' Thinly laminated siltstone and bentonite; black to dark gray. 95 to 103' Bentonite; waxy; gray; chips lack visible texture or structure. 100- 103 to 121' Siltstone and very fine-grained sandstone; thinly laminated; fish scales; phosphate nodules; medium hard; dark gray to black. 110- K_[ 114 to 115' Very hard dolomitic concretion; required 2 hours to drill 1 foot. • 120- -_ BOREHOLE LOG PBS-6, Sheet 2 depth lithic Description (feet) log 120- -^ 121 to 123' Bentonite; fine-grained granular texture; gray. 123' ground water flow at about 2 gpm. 123 to 131' Siltstone; thinly laminated; slightly dolomitic; a few fish scales • and phosphatic nodules. 130- 131 to 189' Portuguese Tuff (bentonite); upper part waxy becoming more granular at depth; ha aritinEfl e gray color. r.� 140- r\,'h • lJ 150- 'cam (l�J 160- �u e' 1 170- i✓1 1110 180- ✓Cl. v'1 184 to 189' Bentonitic tuffaceous sandstone; contains some siliceous rock. 189 to 190' Siltstone and mudstone; siliceous; hard; dark gray. 190- '-- Total depth 190 feet. Four-inch threaded PVC installed to 100 feet. Slotted screen 70 to 90 feet. BOREHOLE LOG 4111 Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: PBS-7 Sheet 1 of 3 GPS boring Tocation:14-_ 77- :17$3274 GPS boring elevation: 298.6' Drillers: E. Sanduval with-OWE-95-Core rig Drilling company: Layne Environmental Services Drilled on: 2/26 to 29/96 Geology logged by: Dana Cole Date Core Run Recovery Depth Graphic Dip Description and box in feet, in log B=bedding times % & base feet SP=slide plane 2/26/96 0- ��� Landslide debris (0 to 29 feet) 09:45 2- ''/-- Brecciated clasts to cobble size in uncemented mud matrix; yellowish brown (10YR5/4). 1 1 3.7/6.6 4- '�fl: 55% 10:40 6.6 6- 8- I`?\ 1 2 1.1/5.0 \'- ` 22% 10- (\� 11:00 11.6 u' 12- 1-- Slide debris more cohesive; 1 3 3.9/5.0 14- -,:>` 78% NI- @ 15.1' soft, dark yellowish brown (10YR3/2) mudstone 11:35 16.6 16- icontains yellowish orange granules of mudrock. 18- . i 1/2 4 4.9/5.0 ,1= 98% 20- 11:55 21.6 !- 22- ]��' 2 5 1.3/5.0 24- '�r Bentonite. 27%0 . ; � 12:20 26.6 26- 1�"`. Bentonite at 28.6' contains slickensides dipping 35 28- !�J: degrees; bentonite clasts in bent. matrix; pale orange. 2/3 6 5.0/5.0 SP: 12 Slide base at 29.1 feet. 100% 30- �. B: 12 Laminated siltstone and shale; light gray to medium gray 13:00 31.6 i' to olive gray. 32- ! Laminations and thin beds continue; fractures in top 0.7 --- 8: 17 feet; pyrite in joint at 33.9 feet. Sandstone bed 35.3 3 7 5.0/5.0 34- - ! to 36.5 feet; graded bedding very fine on top to coarse 100% - on bottom; white (N8) to light gray (N7). 13:30 36.6 36- = Fine-grained bentonitic sandstone; contains slumps and 38- `„: swirls at 37.5 feet; subrounded pebbles at 38.1 to 38.4'. 3/4 8 5.0/5.0 100% 40- �y B: 15 Thin bentonite bed at 40.6 feet. 14:08 41.6 42- --� 4 9 5.0/5.0 44- :- 100% 14:30 46.6 46- `� B: 13 Thinly laminated and interbedded mudstone and graded 48- _-- to sandstone. 4/5 10 5.0/5.0 '..-- 14 100% 50- 14:58 51.6 %�. 52- ;moi B: 12 Same as run 10; swirls and slumps at 52.0 feet. Rip up to clasts at 56.0 to 56.5 feet. 5 11 5.0/5.0 54- --- 13 100% .' 15:25 56.6 56- �- Laminated to thinly interbedded siltstone and shale; fracture • subparrallel to bedding at 57.8 feet; fracture perpendicular . 58- B: 22 @ 59t.4o'bedding with gypsum along it at 58.0 to 58.4 feet. 60- -% Log of PBS-7 continued, sheet 2 of 3. OD Date Core Run Recovery Depth Graphic Dip Description and box in feet, in log times % & base feet 2/26/96 12 5.0/5.0 60- �2., 15:55 6 100% .;� B:10-12 Sandstone bed 0.2 feet thick at bottom of run. 61.6 62- Same rock types and colors (gray) continue; fish scales at 64- 62.8 and 65.4 feet. Graded bed above slumps in mudstone at 6 13 5.0/3.7 -% B:13-14 63.2 feet. Core fractured from 63.6 to 64.3 feet. 66% 66- 16:25 66.6 -,i Bentonitic sandstone from 66.7 to 67.7 feet; pyrite at base of 2/27/96 6 14 2.0/2.0 68- B: 14 sandstone. Laminated siltstone olive gray (5Y4/1) to mrd. to 07:35 100%, 68.6 %j B: 13 dk. gray (N4) at bottom of core. 7 15 3.0/3.0 70- —j Slickensides at top of core. Laminated light gray (N8) to light 08:05100%, 71.6 =i B:13-14 olive gray 5Y6/1 siltstone 72- .ii? 7 16 5.0/5.0 74- --� Siltstone and fine-grained sandstone form distinctive graded 100% : B: 13 bed with base at 75.8 feet; dark laminated beds below. 08:40 76.6 76- �� Portuguese Tuff (77.5 to 135.6) 78- ....::- .%, 1Tpper part Taminated to thin bedded very fine-grained white to 7/8 17 5.0/5.0 "_'5 bluish gray bentonite. Fractures offset beds from 78.0 to 100% 80- ^i 79.8'. Bentonite breccia from 80.0 to 80.6' underlain by 09:40 81.6 slump structure. 82- 1•--;" Extensive soft sediment deformation; base of deformed zone 82.2 feet. 8 18 5.0/5.0 84- 'SJ 100% 10:10 86.6 86- Vii: Includes bentonitic pumice granules. 8 19 2.0/2.0 p 10:30 100%,88.6 88- .,/Ji 20 3.0/3.0 4111 100% 90- Sl` 10:45 9 91.6 1) -': 92- j<�` 9/10 21 5.0/5.0 94- k • 100% '1 11: 10 96.6 96- 1 ,; Graded sanstone and granule beds to bottom of Portuguese Tuff; j.�_i gray to white (N6 to N8). 98- I 10 22 4.5/5.0 -1 90% 100- 1 11:40 101.6 .` 102- 6� .. i •i 10/11 23 5.0/5.0 104- €_.-- 100% I)• 12:20 106.6 106- 1-::* 108- ./'':: 11 24 5.0/5.0 "" 100% 110- 1 12:50 111.6 �� . 112- - t 11/12 25 5.0/5.0 114- 1,,,,-1 100% s;J 13:30 116.6 116- \: 12 118- ' ".) i 120- i.`, / • Log of PBS-7 continued, sheet 3 of 3. • Date Core Run Recovery Depth Graphic Dip Description and box in feet, in log times % & base feet 2/27/96 2.6/5.0 120- Portuguese Tuff (bentonite) continued. 12 26 52% Coarse-grained beds of sandstone and granule conglomerate of 13:55 121.6 122- C7; volcanic origin. 12 27 1.7/2.5 ',.:j' 14:10 68%,124.1 124- 1J 2.5/2.5 13 28 100% 126- 14:35 126.6 ., 128- 13 29 5.0/5.0 100% 130- 15:00 131.6 132- 14 30 5.0/5.0 134- 100% 2•- Base of Portuguese Tuff at 135.6; scour contact with 15:35 136.6 136- B: 12 underlying siltstone. — Laminated organic-rich siltstone interbedded with 138- tuffaceous sandstone. 14 31 5.0/5.0 100% 140- 140.9 to 141.4' Bentonitic pumice-lapilli tuff bed; lacks 14:05 141.6internal bedding. 142- Mg 141.4 to bottom at 141.6' Laminated siltstone. Total depth: 141.6 feet. Two-inch-diameter monitoring well installed to below slide base. ill BOREHOLE LOG Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: PBS-8 Sheet 1 of 2 GPS boring Tocation:Y;OI5721T—-4 7$ 5� GPS boring OW-Mon: 281.2' Driller & rig: A. Parra -0177F 1x60 air rig Drilling company: Layne O onmental Services Drilled with 10" bit Drilled on: 2/19-26/96 Geology logged by: R. Crook Depth Lithic Description (feet) log 0- Landslide affected material (0 to 71.5 feet) if t6T0'— o$if iTTay,slightly sandy; minor pebble-sized tuff fragments; very dark gray-brown. 10- 1.! J 10 to 27' Bentonitic tuff; white to pale yellow; soft. 20- 1tJ 1eri 27 to 35' Slightly clayey, sandy silt; 'scattered rock fragments; soft; light yellowish brown. 30- i-• .1 35 to 48' Fine sand with fine-grained sandstone fragments; light olive brown. 40- 48 to 52' Fine sand with admixed bentonitic tuff; orange to gray. 4110 50- 52 to 56' Gravelly sandy silty clay; stiff; yellowish brown. /6? 56 to 68' Paleosol; gravelly sandy silty clay; very stiff; yellowish brown. 60- 68 to 70' Fine sand and bentonic tuff; orange to gray. 70- 70 to 71.5' Gravelly sandy silty clay; very stiff; yellowish brown. 71.5 Slide base; start of intact bedrock. 72 to 99' Thinly laminated siltstone; hard; fractured; dark gray to black. 80- ==-77:-= 85' Few hard dolomitic layers; minor pyrite and calcite veins. 90- 95 Fish scales and phosphate nodules. ---._ 99 to 100' Bentonitic tuffaceous sandstone; minor siltstone; gray. 100- 101 to 165' Portuguese Luff; mostly waxy bentonite; contains pyrite and dolomite on fracture surfaces; white. 110- Fine-grained to aphanitic waxy bentonitic tuff; lacks visible bedding; light gray. • 120- -).\:-! BOREHOLE LOG PBS-8, Sheet 2 Alk depth lithic Description (feet) log 120- /7.:-/ bentonite continues. �I 130- = , I %, 140- 150- 4 - ; ;,� 156 to 163' Non-bentonitic tuffaceous sandstone; monor lithic and lapilli fragments; fine to medium-grained; light gray. 160- '!` 1 163 to 165' Bentonitic tuffaceous sandstone; contains lithic and lapilli fragments and siltsone rip-up clasts; dark gray; base of Portuguese Tuff. s! 165 to bottom at 168' Dolomitic siltstone; hard; thinly laminated to thinly bedded; dark gray. 170- Total depth 168 feet. Two-inch threaded PVC installed to 90 feet. Slotted screen 50 to 70 feet. • 1110 BOREHOLE LOG III ' Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: PBS-9 Sheet 1 of 2 GPS boring Tocation:'-hT a .534 ET—173lucu-- GPS boring elevation: 185.1' Drillers: A. Parra wit P T60t air rig drilling company: Layne Environmental Services Drilled on: 2/27/96 Geology logged by: R. Crook Depth Lithic Description (feet) log 0- L Landslide affected material (0 to 87 feet) o:' tm'Silty sancTy clay and gravelly sandy clayey silt; yellowish brown. - 6 G.- 10- o 'G' _c 20- ..v.- ': o' . 21 to 51' Fine to very fine-grained sand; gravelly and slightly clayey. -o ---_:= Some rounded pebbles. 30- o.. 40- t:..4i: III 50- 10.•Q ,_ ; 51 to 55' Paleosol; silty, slightly sandy clay; very dark gray brown. iii 55 to 58' Sand; coarse to fine; slightly silty; dark yellowish brown. L.. . 58 to 68.5' Silty clay; slightly sandy and gravelly; brown. 60- _ __ Carbonized wood fragments. 68.5' Slide plane; some sheared bentonite fragments 70- 69 to 87' Siltstone; thinly laminated; minor fine-grained sandstone; few fish 7--:7' scales; very dark gray to dark brown. 80- , i Fine to coarse lithic fragments in siltstone. L. t i_:71- i-.- 4_ 86 to 88' Water. 87.7' Slide base (not recognized during drilling but casing sheared off at this 90- depto--- j 91 to 91.5' Claystone with thin laminations of sheared bentonite. 91.5 to 104' Siltstone; thin bedded to thinly laminated; black. :—...1. 100- _—.- 104 to 106' Bentonite; massive; waxy; gray. 106 to 107' Siltstone thinly laminated; black. 107 to 173' Portuguese Tuff (bentonite) 110- ,J Com, 107 to 108' r ntom i c Tuffaceous sandstone; light gray. 1:117) 108 to 160' Soft waxy bentonite; light gray. 1J)(-- • �120- BOREHOLE LOG PBS-9, Sheet 2 • depth lithic Description(feet) iog 120- 1%.-5N 'l^ 127' Six inch layer or rip-up clast of siltstone 130- 140- 1'),- '71)150- �� �✓ 160- ' 160 to 173' Bentonitic, tuffaceous fine-grained sandstone. 170- L4 173 to 175' Tuffaceous sandstone with lithic fragments. • 175 to 176' Siltstone; dark gray-brown; hard. Total depth 176 feet. Two-inch PVC installed to 90 feet. PVC perforated 50 to 70 feet. BOREHOLE LOG Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: PBS-10 Sheet 1 of 2 GPS boring Tocation-11170 517 E?7I7$778"- GPS boring a evation: 170.4' Drillers: A. Parra will-7770W air rid—railing company: Layne EnvironmenfaT Services Drilled on: 3/19-20/96 Geology logged by: D. Cole • Depth Lithic Description (feet) log 0- Landslide affected material (0 to 126.5 feet) i$! U to T56'-MTUTtic lore?anguTar rock fragments of mostly pebble size in a pale brown %cj. (10YR7/4) sandy silty clay matrix; a few carbonized wood fragments. 0.5; 10- S';i ais, 20- a 30- Q, 1_4. 40- 3 0 02/ -ip. 1111 50- '0G o_ �a.o teaJ, 56 to 65' Multicolored rock fragments to pebble size in clayey fine-grained sand matrix; some bentonite granules. 60- 't-,.;: .111 .f 65 to 74' Cobble size clasts of subangular to subrounded, hard, fine-grained sandstone. 70- ' 74 to 83' Pebble size fragments of siltstone and bentonite in muddy matrix; of O possible debris flow origin. 80- .'.._d_-_1 7777 83' Bedding in sandy sample indicates alluvial origin. 90- -- 4 90' Back into breccia of pebble size rocks in a muddy matrix; clasts are white, <. ''?; reddish brown and dark yellow in color. cola 100- 5F.,3,±1 1�O a 110- "UC. rs--CA i 120- 113 to 120' Bentonite containing rock fragments. 120 to 126' Very fine-grained sand; yellow orange. BOREHOLE LOG PBS-10, Sheet 2 depth lithic Description (feet) log 120- . 126' Slide base; much firmer drilling; color change from shades of yellow, brown;^ and orange to unoxidized gray. _ 127 to 156' Laminated siltstone, mudrock and fine-grained sandstone with some 130- ;174. bentonitic interbeds; dark olive gray (5Y3/1 to 5Y2/1). l='' 135' Bentonitic sandstone bed. 1-7 140- ;- •7 146' Thin bentonite bed. r• 150- °'- 1 153' Bentonitic sandstone bed. { '— 156 to 209' Portuguese Tuff (bentonite); light to dark gray (N7 to N4); aphanitic 'f 160- J near top recoming sandy near bottom. 170- ✓� 180- IL, • l 190- ''J IBJ J 200- 1 200 to 209' Coarse to very coarse-grained tuffaceous sandstone. k . .1-.:), 4 209 to 212' Hard siltstone; dark olive gray (5Y3/1). 210- �� Eal Total depth 212 feet. • BOREHOLE LOG r• Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: PBS-11 Sheet 1 of 1 GPS boring TocationE N 1T Y6'—E71/9,0 GPS boring eTevatfon: 279.5' Drillers: A. Parra witF AP TODD reverse air rig Drilling company: Layne-En7Fonmental Services Bit size: 10" Drilled on: 3/20/96 Geology logged by: D. Cole Depth Lithic Description (feet) log 0- _o, 0 to 11': Fill; sandy clayey silt with small rock fragments. O_.G i:-":.:- If-,i, so_n: 10- ii 11' to bottom: Bedrock 11 to 25' Thin 6edc f to laminated siltstone and very fine-grained sandstone; oxidized to yellowish brown (10YR5/4). 20- r--_ 25' Becoming unoxidized and harder; very fine-grained sandstone. 30- — . 34.5' Thin bentonite bed. _; 6%.;f7-- 39' Hard siliceous or dolomitic siltstone; thinly laminated; dark gray (5YR4/1) 40- ...J 45 to 109' Portuguese Tuff (bentonite); medium to light gray. • 50- J r,.) (-" • 60- >`� ..%.. 70- J 80- J J 90- C-1' JAI ,. 100- "1..J ✓) 102' start of coarse grained tuffaceous sandstone. .7-NC 109 to 112' Hard siltstone; olive gray (5Y4/2). 110 mit - Total depth 112 feet. III BOREHOLE LOG • Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: PBS-12 Sheet 1 of 1 GPS boring Tocation:7020,371 177 O GPS boring eTevation: 340.9' Drillers: A. Parra wit�i ArTODIT reverse air rig Drilling company: Layne-UIVTFOnmental Services Bit size: 10" Drilled on: 3/21/96 Geology logged by: D. Cole and P. Ehlig Depth Lithic Description (feet) log - 0- ' 0 to 27.5 Landslide debris %'.4t Sandy siTty clay wT Ti rock fragments; yellowish brown to orange. ,a, l0- G 4a- i,Q/ 20- a,•e p .. c.; 27.5' Slide base. 30- :.-.72.7. 27 to 71' Dominantly laminated siltstone; minor very fine-grained sandstone with a few interbeds of bentonite; partially oxidized near top becoming unoxidized shades of gray by 31 feet. r„^ 37' Bentonite bed. 40- --- 50- :1-5,:;4i 50' Bentonite bed. • _ • 56' Water seeping into hole. 60- _=, 62' Bentonite bed. r„<J 71 to 129' Portuguese Tuff (bentonite); medium to light gray; very-fine grained r to waxy ar topnecomTng coarse-grained near base. 80- 1...../\ E)\.,, JQIt -I'-; 90- (J /mow 100- }J`( TOJ 110- if/J. F,:::3 • 120- 1 _!:).:. • v,• 129 to 132' Hard siltstone. 130- ., Total depth 132 feet. • B-96-1 to B-96-18 BOREHOLE LOG 4110 Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: B-96-1 Sheet 1 of 2 GPS boring—Toc'ation:f 018 /5U E4 1 -4T'— GPS boring eTevation: ca. 191 Drilled by: Tim Galla of-G llag�ier 7$9i9Tling Service using 30 inch bucket-auger Drilled on: 2/5/96 Logged by: R. Crook using cuttings & P. Ehlig by downhole method depth lithic attitudes Description (feet) log 0- Landslide debris 15to-3$rFre-CET; rock fragments in soft yellow 2- - brown matrix composed of fine sand, silt and clay. 4- :2, c- J 8- U;; 10- -� 12- �o 14- - -J- O•G 16- p;� : G - 18- fl..: 20- .. 22- U, 0 24- -C2:-.1; C • 26- - a 28- gid. 'a 30- 32- •-' .a : _=t 34- .•at 36- c a 38- I 38 to 40' Bentonitic breccia. 40- --- 40.5' Slide base N6OW 17SW. 41 to 50' siltstone, medium hard, red-brown, 42- �, contains thin gypsum veins typically 2 mm thick. 44- • %t 1 45' seepage; water level 53.1' during logging. 46- �-1 48- '~ --50- - 50 to 62' laminated siltstone and interbedded �• sandstone, beds 2 to 20 mm thick, fish 52- scales in siltstone, locally hard .:-:•-•:•,...„:4 � dolomitic layers. 54- 56- •.1.7:01..... 58- - 41) Boring No.: B-96-1 Sheet 2 of 2 depth lithic _ attitudes Description • (feet) log 60- 62- 62' bentonitic gouge about 0.1' thick, finely sheared, plastic. (sample) 64- 62 to 65' laminated siltstone, dark gray. i65 to 68' laminated dolomitic siltstone, hard, S�' 66- difficult to drill, grey to dark gray. 68- s .1 70 - Total depth 68' ; hole covered; water level 39.25' on 2/9/96; hole backfilled on 2/9/96. • BOREHOLE LOG • Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: B-96-2 Sheet 1 of 1 GPS boring Tocation:1N47611r E f7$;D?0— GPS boring eTevation: ca. 276 Drilled by: Tim GallagTTr oi'-gallagher 6riTling Service using 30 inch buc a-auger Drilled on: 2/5/96 Logged by: Dana Cole using cuttings and P. Ehlig by downhole method depth lithic attitudes Description (feet) log 0- Landslide affected material (0 to 19 feet) t6 T9 711 Treccia'; unsorted rock fragments in sandy, silty clay 2- G matrix; 10YR7/6 (yellow); contains fragments of gypsum and 4- q_ dolomite. 6- O0 Qe,- 8- 10- NO 12- o 14- {'-T 15' Becoming darker orange with higher clay content. 16- p 18- • Slide base N20W 17SW; 19.0' on high side; 19.9' on low side; saturated at top. 20- • 20 to 30' Laminated siltstone weathered and fractured near top becomes hard with depth; mottled orange to dark brown near top 22- solid gray to very dark gray (5Y3/1) in deeper part. 22.1' Seepage 24- 24 to 29' Thin, steeply inclined gysum veins. . 26- . B: N47W 19SW 27' Thinly laminated; beds 1 to 5 mm thick. 28- 30- Total depth 30 feet. Water at slide base at 19 feet. BOREHOLE LOG • Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: B-96-3 Sheet 1 of 2 GPS boring Tocation: 0+215362--E 178,429 GPS boring elevation: 477.4' Drilled by: Tim Gallagrier oiTallagher Tilling Service using 30 inch bucket-auger Drilled on: 2/6/96 Logged by: Richard Crook using cuttings and downhole method depth lithic attitudes Description (feet) log 0 - T22.101 ,--/ D to m75', dark gray-brown sligtly sandy clayey silt 2- '�: with some rock fragments. Landslide debris 4- `_. 3:5—to^TT:B'�eTormed to brecciated bentonitic tuff; varigated in shades of white, pink and yellow; 6- -r) mainly gritty bentonitic calcareous (?) tuff to 50' and waxy bentonite and bentonitic tuff below 8- \�� 50'; fragments massive to laminated; derived from Portuguese Tuff. 10- ) (, 12- 14- ,- 16- 18- 20- -1j 22- 24- 26- J L 28- �L\1 30- j-27-1 32- ��.--1 34- !( 9i 36- 38- ✓\✓ 40- !1 �" 42- 44- If-Ji 46- j C' 48- ,; 50- 52- 54- 56- 1.4,\.!, ` f 1 58- • BOREHOLE LOG B-96-3, Sheet 2 depth lithic attitudes Description (feet) log 60- Landslide debris, continued. 62- \_ 64- 66- (C) 68- 70- 72- 74- 76- �� ? Slide base N70E 4N; 77.8 to 77.9'; sheared clay with slickensides, very stiff; 78- brown; thin gypsum vein at base. 77.9 to 88' Bentonitic tuff; massive to laminated; 80- (. -1 pale yellow. 82- r-'/ 84- 86- e-1_i h)J1 88- �.. 89 to 118' siltstone; thinly laminated; some thin siliceous c layers; a few thin bentonitic beds; light olive gray; 90- \\I gysum seams 1/4 to 3/8" thick subparallel to bedding. • 92- B: N25W 60NE \��• 94- \.\�\ 96- \\\� B; N35W 70NE 98- \ '1, 100- ,\\4 102- \,\\ 104- �,\\ 106- I\• \ 108- j\\\% 110- j\\\,'` B: N45W 75NE ` 111' Fold in bedding; bedrock grades to dark gray. 112- ' / B: N45W 38SW 114- F. jai 116- � �' 118- Total depth 118'; no ground water. • BOREHOLE LOG • Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: B-96-4 Sheet 1 of 2 GPS boring Tocation:-Ff4 2-0 7;17$3060 GPS boring eTevation: 464.7' Drilled by: Tim GallagTie h Tla6.RT DrilTing Service using 30 inch bucTcet-auger Drilled on: 2/7/96 Logged by: R. Crook using cuttings and P. Ehlig using downhole method depth lithic attitudes Description (feet) log 0- Landslide affected material 'T to 4'-'topsoiT;Sar—Tc-6rown; sandy clayey silt with rock 2- i fragments. 4- 4 to 7' Gravelly, slifghtly sandy, clayey silt. •D•0 6- o -• �0 7 to 19' Bentonitic debris; blocky; pale yellow. 8- 10- 12- ,;( 14- r-71 16- kr- 18- I 19 to 30' Thinly laminated siltstone and very fine-grained 20- - - sandstone; locally bentonitic. 22- 24- : 26- �=• • 28- 30- E• 30 to 55' sandstone; fine to very fine-grained; well sorted; is lacks visible bedding; yellow. 32- ;.:•; 34- 36- 38- !-; -- 40- .� 42- 44- ;�-•---• 46- 48- 50- - 52- B: N3OW 44NE 54- 55 to 56' Bentonite; pale yellow to yellow red; 56- = gypsum veins. 56 to 64' Siltstone; thinly laminated; med. hard; 58- ': pale brown; thin gypsum veins parallel bedding & • t=.•' on fractures. 60- _ BOREHOLE LOG B-96-4, Sheet 2 depth lithic attitudes Description (feet) log 60- 61' Stiff clay gouge with slickensides; very thin. 62- 64- = 64 to 71' Siltstone & very fine sandstone; thinly laminated; medium hard; pale brown to light gray. 66- 68- _ 70- 71 to 82' interbedded siltstone and bentonite; 72- —! thinly laminated; light gray to pale yellow to orange. 74- 76- 78- 80- - - �i 82- -•.'( 82 to 85.2' Fine-grained sandstone; slightly silty; •.•• unbedded; med. soft; reddish yellow. 84- %, Slip surface N5E 17E at 85.2' in brown clay with slickensides. 86- -% 85.4' Bentonite bed 2" thick; stiff; light gray. %%r*? 85.4 to 90.6' Bentonitic tuff and siltstone; light gray to white to 88- yellow brown. ® 90- Probable slide base N52W 28NE at 90.6' with slickensides oriented S55W. 90.6 to 91.2' Sheared bentonite with abundant gypsum veins. 92- 91.2 to 98' Siltstone and fine-grained sandstone; laminated; yellowish brown to dark yellowish brown. 94- B: N30W 9NE 96- 98- Total depth 98 feet. No ground water. 100- • BOREHOLE LOG • Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: B-96-5 Sheet 1 of 2 GPS boring Tocatio�n:t O'L15;L II78,7311' GPS boring elevation: 437.4' Drilled by: Tim Gallag eroTTallagier-brilTing Service using 30 inch bulEcet-auger Drilled on: 2/7/96 Logged by: R. Crook from cuttings; P. Ehlig by downhole method depth lithic attitudes Description (feet) log 0 - . Landslide affected material 7f 5 TO'F5T1 roceTregme`nts of pebble to boulder size with 2- �� sandy clayey silt matrix; brown. 4- . . 6- Q 8- -A 10- 10 to 16' Fill; slightly sandy silty clay with some rock o;C5 fragments; medium to dark brown. 12- G' 14- * 16- c'511' 16 to 62' Landslide breccia; brecciated bedrock consisting of fine-grained sandstone and thinly f 18- laminated siltstone; yellow to light gray. 20- - 22- 24- • 26- ;-%71 71 28- \-• 4 f 30- 1 -. 1 32- 1_'. 34- 1.: 14 36- r'��� 38- �\ 40- � j 42- /�44- 1-;:-_-_:-..- I `Nj 46- 1,:,.. . 48- l%ii .,;-,.-i // 50- ��. 1 52- ---;(;:i----::;=) 54- - 'i 56- I 58- i- 41111 -� 7 : B: N4OW 46SW BOREHOLE LOG B-96-5, Sheet 2 • depth lithic attitudes Description (feet) log 60- 62- ;;!..‹ Slide Base N48W 29SW at 62'. �% 62 to 72' Thinly laminated siltone with interbedded clayey 64- =%i tuffaceous fine-grained sandstone; medium soft; weathered l'.---- B: N45W 19SW orange-brown to green-brown to light gray. 66- "%; 68- �•I j B: N45W 29SW 70- ,/� 72- !- 72 to 75' Siliceous siltstone interlaminated and thinly B: N47W 22SW interbedded with fine-grained sandstone; contains fish scales; 74- % hard; gray. 75 to 76' Bentonitic tuff; soft; yellow to blue-gray. 76- �% 76 to 79' Thinly laminated siltstone and sandy siltstone; dark gray J� to olive gray; a few thin beds of hard dolomitic siltstone. 78- 80- Total depth 79 feet. No ground water. • BOREHOLE LOG IPProject: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: B-96-6 Sheet 1 of 2 GPS boring location: 1 61T3;gg8--E47179,07 — GPS boring elevation: 433.5' Drilled by: Tim Gallagfer ooa TllaFgzier 15riTling Service using 30 inch buEkif auger Drilled on: 2/8/96 Logged by: R. Crook from cuttings and downhole by P. Ehlig depth lithic attitudes Description (feet) log 0 - Landslide affected material (0 to 81 feet) 0",--- if to 31-T lT;pebble to-55Til der size rock fragments in a sandy 2- 1 silty clay matrix; brown. i 4- o= c=U 5 to 13' Slopewash; pebble to cobble size rocks in a 6- o,c' silty, clayey sand matrix; pale brown. 8- 0 10- :C'- _ .� 12 i.o� 13 to 40.3' Topsoil; predominantly sandy, silty clay 14- Ho:: containing scattered pebble to cobble size rock ?_•- fragments; some caliche stringers and blebs; dark 16- 1 -7(52- yellow brown. 18- L -t 20- E_o; 22- ;- _l 22' Dark gray-brown. ` moi 24_ 1..e.---i _ 1111 cl 26- i—•c i 28- 3b; ...- 01 30- �o'a o; 32- o G 32' A few gravelly layers 01 34- I ,; 36- J_-_ 38- r:-:. 38' Small fragment of carbonized wood 40- :u_L` 40.3 to 65' Breccia; rock fragments in a sandy, silty clay matrix; 42- 7-.0:6, yellow to yellow brown. :: 43 to 53' Sand; very fine grained brownish yellow. 44- 44' Open voids between some rock fragments. 46- .0„ 48- ;G 50- G 52- r•�C, 54- o 56- ,•G; 58- •• . .A 60- BOREHOLE LOG B-96-6, Sheet 2 0 depth lithic attitudes Description (feet) log 60- D 62- �_` 64- :Q- 66- 65 to 71' Topsoil; slightly gravelly, sandy, clayey silt with - minor caliche streaks; some carbonized wood fragments; dark __ brown. 68- !,2,:::: 70- i o_o ;�, 71 to 75.2' Breccia; rock fragments in a sandy, silty clay 72- 01;-. matrix; light yellow to light gray. r; 74- U F.0"-:;;. 75.2 to 78.6' Topsoil; sandy silty clay with scattered pebbles; 76- i;..'_ dark brown. i, 78- 1-°:- -1- 78.6 to 80' Gravelly sandy silty clay; very stiff; brown. 80- '- Slide base N35W 22SW at 80 to 81'; slickensides oriented S37W; marked by 1 mm of /.j clay gouge. 82- __:;,:. 81 to 108' Siltstone and very fine-grained sandstone; thinly ';- laminated; moderately fractures with black Mn dioxide on 84- r.!//,; fracture surfaces; most rock pale yellow. *.,% 86- --- B:B: N3OW 45SW @ 86' polished bedding surface. /! %-,// 88- 'i:-'.l i//>1 • 90 - ?%2 Abundant gypsum seams parallel bedding; jarosite on some ami B: N3OW 43SW fracture surfaces. 92- '/i2 94- l'..(- '4;.. 96- 96' Rock is sheared with slickensides; gray-brown. r/.•% 98- :!/ B: N35W 36SW v/... 99' Soft zone (sheared ?); unoxidized; olive-gray to dark 100- L./!, olive-gray. �j B: N33W 42SW 100' Seepage. 102- i 101' Fish scales in siltstone. ✓�/. 104- f 106- %��; 108- •.-/ —;-• Total Total depth 108 feet. Seepage at 100 feet. • • • BOREHOLE LOG 4110 Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: B-96-7 Sheet 1 of 2 GPS boring Tocation: MT2U;1 F— ;17$78b GPS boring eTevation: 434.8' Drilled by: Tim Gallagher oTTalla her'6riTling Service using 30 inch buEket-auger Drilled on: 2/8-9/96 Logged by: R. Crook using cuttings and downhole method depth lithic attitudes Description (feet) log 0 - Landslide affected material (0 to bottom at 118 feet) T to 1-071 T;-roccf fragments with sandy, silty clay matrix. 2IL - 4- )r;2' 6- 8- ,110._ -8- ._ 10- 10 to 57' Landslide debris; rock fragments in a sandy silty clay matrix; tight; contains gypsum; dark yellowish brown to brown. 12- 14- - 16- C_ 18- 'Cs of 20- ®' 11 22- 24- 1/04C • 26- 'all 28- 30- 30- 32- 8-30-30-32- a 34- D,L 36- 0.711 � 38- s{' 40- a ~ 42- 44- S 46- 48- ; 50- 52- 54- ` 56- 57 to 61' Topsoil; finegrained siltyclay; stiff; dark brown. 4111 Ji` P 58- i/\% 60- IN -N BOREHOLE LOG B-96-7, Sheet 2 i, depth lithic attitudes Description (feet) log 60- 61 to 72.5' Rubble in a stiff sandy silty clay matrix; dark brown. 62- Q 64- ,Qq 66- , 68- 69.5' 2" thick stiff sandy clay; slightly sheared; no slickensides. 70- -- 72- "z4, 72.5' Slide plane N2OW 18N with striations N5W and N85E; plane marked by 3" of stiff reddish brown clay; 8" of bentonitic 74- q sandstone below slide plane. 73.3 to 76.8' Reddish brown breccia. 76- .c2) 76.8 to 80.7' Paleosol; sandy silty clay; scattered pebbles; a 78- 1,Z, few carbonized wood fragments; stiff; dark brown. 80- N.; 80.7 to 118' Rubble to cobble size in a sandy silty clay matrix; 82- Cc very stiff and tight; yellow to yellowish brown. 84- _O 6.Lj 86- 88- ) • 90- C 92_ G3. 94- *0 96- 6 98- ;�11 100- 0 102- C ..-A 104- 14-44:1 106- C P 108- =C5d .g , 110- •Yr 112- ppoc IC3'114- 116- gyp, 118- c—Q Total depth 118. No ground water. Still in landslide at 118 feet. • BOREHOLE LOG Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: B-96-8 Sheet 1 of 1 • GPS boring location:1 02U T 6 173,0T2-- GPS boring elevation: 436.7' Drilled by: Tim Galla oTGallagfier-69Tling Service using 30 inch bum-auger Drilled on: 2/9/96 Logged by: R. Crook using cuttings and P. Ehlig by downhole method depth lithic attitudes Description (feet) log 0- Landslide affected material (0 to 62 feet) • 1776-7-7-1-117111761-re i n a silty sandy clay matrix; brown. c�� 8- 1°.:,.;_ 8 to 15' Breccia; rock fragments in a clayey sandy silt matrix; 1_1., soft; brown. 10- ,ate QD 12- • O . 14- Z 15 to 21' Paleosol; sily sandy clay with scattered rock fragments; 16- ',-/N• contains caliche; dark reddish gray. 18- ,\i , 20- , :' - 21 to 35.5' Colluvium; small gravel in a silty sandy clay matrix; 22- op I brown to yellowish brown. 24- /"°I 26- c2-%i 0 28- v,! ,_c 30- \k,'''I 32- `t` :i •�.'-41 34- o- 35.5 to 48' Paleosol underlain in part by fine-grained bedded 36- €`/'. alluvial deposits; mostly sandy silty clay with some pebbles; A// f brown to reddish brown. 38- = 1 .rJ 40- �. . ..4 42- 1— 44- i 46- 48- --/ 48 to 62' Breccia; rock fragments in a sandy silty clay to sandy UoO clayey silt matrix; light brown. 50- boS, 52- aQ 54- f%5 56- 4 58- id ill 60- k'‹; �4�; 62- bol �, Slide base N34W 29SW with slickensides oriented down dip; 3" sheared clay at slide � <:' � base. 64- ;�r -.-5` 63' to bottom Thinly laminated siltstone and very fine-grained • �!l sandstone; contains fish scales; gypsum seams parallel to 66- %<)' bedding; medium hard; light olive brown. -; B: N45W 31SW 68- :-.:%.., 7n_ Total denth 70 feet. No around water. BOREHOLE LOG • Project: 1996 PORTUGUESE BEND LANDSLIDE STUDYBoring No.: B-96-9 Sheet 1 of 1 GPS boring TocatTon:IT4620,482 -1777,773-- GPS boring e eTvation: 454.0' Drilled by: Tim Gallagfier of Gal1aglier rilling Service using 30 inch buETcet=auger Drilled on: 2/9/96 Logged by: Perry Ehlig using cuttings and downhole method depth lithic attitudes Description (feet) log 0- Landslide affected material % 7; t5-TV'T pso— iT;—Tar c( Tro`wn at top becoming reddish brown at base; 2- 16 contains small rock fragments in a sandy silty clay matrix. o 4- -;\. 6- 8- - S, S 10- —/ . 1 \ 12- 14- N' 14 to 30' Breccia; rock fragments in a soft brownish yellow sandy silty clay matrix; dry. 16- C1 18- �\G / 20- ��„ fc_ 22- k- 24- _/C- 26- } 2l . 8- 'n 30- =_;i� 30' Zone of soft sandy silty clay; lacks hard rock fragments. 32- !13%U. 34- /ro 1 ,G 36- g t. 37' Breccia on top of reddish brown paleosol layer 6" thick; soil 38- I--' grades downward to yellow very fine sand; dry. 40- I.;-:: 42- J ;.L 42 to 43' Bentonite seams mixed with sand. 1! ` 43 to 53' Sand; very fine-grained; brownish yellow. 44- 1• 46- i='::: 48- i 50- i'• 52- 1.,_/-• Slide base at 53' N5OW 27SW; 2" layer of sheared bentonite; stiff. 54- ! 53 to 65' Siltstone and interbedded very fine grained sandstone and �� 56- ':: B: N38W 27SW shale; laminated; yellow to reddish brown in upper part. i. 58- 1-5..! ;� B: N38W 28SW Yellow siltstone at top becoming becoming gray to dark brown 4111 60 �• below 63 feet; very hard at base; gypsum seams parallel to %i• bedding. f2- ilii yl�� Total depth: 65 feet; moist at bottom but no 64- %!% ground water. BOREHOLE LOG 1111 Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: B-96-10 Sheet 1 of 1 GPS boring Tocatlon:T OT$-,$E t4 TT 772 GPS boring eTevafT6n: 185.1' Drilled by: Benjamin Gutierrez of Gallagher Grilling Service using 30 incrbakcet-auger Drilled on: 3/20/96 Logged by R. Crook using cuttings and P. Ehlig by downhole method depth lithic attitudes Description (feet) log 0- Landslide affected material (0 to 27 feet) 15 to-17' gray lTy silty sandy clay; 10YR4/4 (dark 2- f.�� andl7.5YR5/6o(dark) abrowing n)tato ldepth6 (brownish yellow) 4- p q 6- 8- ��� 12- d- 14- i:5? 16- 18- I/lir 20- 22- I ID 22 to 23' Hard rocks required use of coring bucket. 24- fl c '_ 26- s 27.1' Slide base N75W 16SW, striations N30E. 28- 27 to bottom at 38' Laminated siltstone with a few interbeds of fine-grained sandstone; hard; used coring 30- G, bucket much of time; 5Y4/1 (dark gray) to 5Y3/1 (very dark gray). 32- 1:: "7 . 31 Seepage. 34- 36- 38- Total depth 38 feet. Hole covered with plywood. Water level 29.5 feet deep prior to back filling hole on 3/21/96. 40- • BOREHOLE LOG fill Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: B-96-11 Sheet 1 of 1 GPS boring Tocafion:— OT$:0S—tr,TTh75 7 GPS boring eTanon: 186.7' Drilled by: Benjamin Gutierrez of GallaghieFUrilling Service using 30 incF-fiucTcet-auger Drilled on: 3/19/96 Logged by R. Crook using cuttings and by downhole method depth lithic attitudes Description (feet) log 0- Landslide affected material (0 to 25 feet) -,',4 I'to-13r;rave1Ty silty sandy clay; 2.YR4/3 (dark brown) becoming 2- o G" 10YR6/6 (yellowish brown) at depth. 4- 5: 1 8- ' 9.5' Cored through hard siliceous dolomitic block for 1.5'. 10- 21` 12- 10- 14- cs%;, 15' Some bentonite. 16- 0 17' Bentonite surrounds hard siliceous siltstone fragments; 18- c.. 2.5Y7/4 (pale yellow). 0 19.5' Gravelly silty sandy clay; 10YR6/6 (brownish yellow). 20- ---- !a 22- �J� 22 to 24' Sheared bentonitic clay. 24- -0 24.4 to 25.1 Slide base N75W 16SW, striations N15W. —j 25 to bottom at 30' Laminated siltstone; hard; complete cores 4111 26- ;_ ' B: N85W 13SW using coring bucket; 5Y4/1 (dark gray) to 5Y2.5/1 (black). 26'Seepage 28- 30- '--� Total depth 30 feet. Hole cover with plywood. Water level at 25.2' before hole backfilled on 3/21/96. BOREHOLE LOG 40 Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: B-96-12 Sheet 1 of 1 GPS boring o ac tion:1I OT 7 5D —t4 TT ,397 GPS boring eTevation: 293.5' Drilled by: Benjamin Gutierrez of arriTeFrrilling Service using 30 incFi'TiucTcet-auger Drilled on: 3/20/96 Logged by; R. Crook using cuttings and by downhole method depth lithic attitudes Description (feet) log 0- Landslide affected material (0 to 10 feet) u t`o7-Fine to very fine-grained sand; 10YR5/6, yellowish brown. 2- 3' Sheared bentonite, clay and siltstone; brown to pink to yellow; 4- moderately stiff; moist. 6- • ;. 6.5' Silty sandy clay with admixed pebble- to small boulder-sized r-o rocks; stiff; moist; 10YR5/6 yellowish brown. 8- 7,o,. o 9.7' Seepage. 10- Slide base @ 10.5': N54W 15SW (strike N70W on low side) Sheared clay along slide base. 10.5 to bottom at 14' Laminated siltstone; hard; solid blocks removed 12- by core bucket; 5Y5/2 olive gray to 5Y4/1 dark gray. 14- = Total depth 14'. Inserted alluminum pipe in hole to use as well; water level at 8.84' on 3/26/96. Sheared clay sample from slide base given to Jim Wilkinson of BYA for testing. BOREHOLE LOG 4111 Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: B-96-13 Sheet 1 of 1 GPS boring Tocation:75DT j876 7471787117 GPS boring eTevation: 289.3' Drilled by: Benjamin Gutierrez of GaTlagFier lsrilling Service using 30 incl-i TiucTcet-auger Drilled on: 3/20/96 Logged by R. Crook using cuttings and by downhole method depth lithic attitudes Description (feet) log 0- Landslide affected material (0 to 10 feet) -M u to 7.ururavelTy silty sandy clay; 2.5YR6/6, light red. 2- 4- 6'.:•• 5' Fine to very fine-grained sand with some admixed silt and gravel; olive brown. 8- 10- - Slide base:N4OW 16SW 10.3' Slide base marked by 3 inch layer of sheared bentonite. 11 to bottom at 16' Laminated siltstone with some hard bentonitic 12- = interbeds; gray to dark gray. 14- •r-- 16 • - Total depth 16 feet. No water observed. 11 4110 BOREHOLE LOG 410 Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: B-96-14 Sheet 1 of 1 GPS boring Tocation:-W4;OT11,7�t—t' T7875D$ GPS boring eTevation: 284.0' Drilled by: Benjamin Gutierrez of Ga111WETr/vrilling Service using 30 ine t k et-auger Drilled on: 3/21/96 Logged by R. Crook using cuttings and by downhole method depth lithic attitudes Description (feet) log 0- Landslide affected material (0 to 36 feet) TY6-1 •r"i;ravelTy silty sandy clay; 10YR4/3, dark brown. 2- o 4- c-i .a- GG 6- -a 8- 10- `-:c> Gy, _ 17.,<57.- j 12' Bentonite; white; slightly sheared. !'=_) 13' Bentonite and siltstone. 14- 14' Fine-grained sandstone; structureless. 15' clay. 16- lay- 16- CJI 16' Slightly sheared bentonite. 20- H. L: 22- b-o e 22' Gravelly, silty sandy clay; 10YR5/6, yellow brown. 24- '.: " 24.5' Highly brecciated siltstone with some bentonite; brown. 26- 1:.L=✓I 26' Bentonite. 27' Fine to very fine-grained sand; moist; dense; 10YR5/6 28- yellowish brown. 29.4 to 30.6' Clayey siltstone; 5Y6/2 light olive gray. 30- = p 30.1' Seep. - •-< t 30.6' Brecciated siltstone; slightly clayey; gypsum; structureless; 32- ��' i, brown. /j� B: N22W 50W 33' Seep 34- li��' i/1 36- -1Slide base: N8OW 12SW 37' Slide base; sharp color change. 38- =- • 37 to bottom at 40' Thinly laminated siltstone and waxy claystone; becomes hard near bottom; 5YR6/2 pinkish gray to 5YR3/1 very dark 40- gray. Total depth 40 feet. Seepage at 30 feet. 4111 BOREHOLE LOG 4111 Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: B-96-15 Sheet 1 of 2 GPS bori ng^l ocati on:IT 7o1 7--E 178?174 GPS boring elevation 13.8' Drilled by: Tim GallagTer 6T GaTlagfier-D7ilTing Service using 30 inch ITEUT-auger Drilled on: 3/20/96 Logged by: P. Ehlig using downhole method depth lithic attitudes Description (feet) log 0- Landslide debris (0 to 76 feet) to X5:5'-entonite; gently inclined slide surfaces at base. 2- !J/7 4_ ; i l� 6- , 8- ^tr ,-', 9.5' Top of very fine grained sand; yellow brown. 10- 12- 14- 16- 18- 20- 22- • 23 to 26' Clay. 26- - 26 to 28' Fine-grained sand; yellow brown. 28- 28 to 31' Clayey silt. iffi 30- -- oG 31.5 Zone with rocks; 1 foot thick. 32- 34- 36- _ 36 bentonite. -2- 9 38- --_-_,A„ ,i 40- F--,11 41 to 44 Rocks in sand matrix. 42- 44- :.-, 44 Fine-grained sand. } 48- V. 50- 1 •: 52- +"J 52 Bentonite 54- 0/2; 56- / -. I 58- i-✓ • 60- F:2:7:4 60 Siltstone; red brown Boring No.: B-96-15 Sheet 2 of 2 11110 depth lithic attitudes (feet) log Description 60- • 62- 64- 66- i 68- ;- 70- 72- Seepage above base of slide. 74- 76- ' 76' Slide base NiOE 8W. 76 to 80 Laminated siltstone; unoxidized; gray to chocolate brown. 80- Hard drilling at base. Total depth 80 feet. Hole covered with plywood. Water level 66.15 feet below surface before hole backfilled on 3/21/96. • • BOREHOLE LOG Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: B-96-16 Sheet 1 of 1 . GPS GPS boring ocation:N ,O1 T 4 17$355— GPS boring eTevation: 283.8' Drilled by: Tim Gallag�ier oT aallag-her Drilling Service using 30 inch bucket-auger Drilled on: 3/21/96 Logged by: R. Crook using downhole method depth lithic attitudes Description (feet) log 0- p 6 Landslide debris (0 to 41 feet) siltstone an3—sandstone blocks in clayey, silty sandy matrix; 2- g0..0 2.5Y5/4, light olive brown. 4- -a 6- C")":-:‘. C--� 10- 6 LD 11 Siltstone and minor sandstone blocks coated with jarosite; 12- IC,.r 12 to 14 Bentonite; varigated light gray to orange to yellow. . - 14- �:a• 14 Breccia; gravelly sandy silty clay; 10YR6/6 brownish yel. 14.5 Paleosol; slightly gravelly silty sandy clay; 10YR4/4 16- Ga" dark yellowish brown. 18- s'le�f 16 Rock fragments in clayey silty sandy matrix; 10YR6/6 brownish yellow. 17 to 20 Fragments of bentonitic tuff. 20- a�. 20 Slightly gravelly silty clay; 10YR4/4 dark yellow brown. — 21 Gravel in sandy clay matrix. 22- Cj= 22 Gravelly sandy silty clay. 0 23 to 27 Abundant white bentonitic tuff fragments 24- I`;). • 26- :•J� `-:.�;• 27.5 Clayey sandy silt with layer of rock fragments of 28- =1 sandstone, bentonite and siltstone; 10YR5/8 yel. brown. 28 to 32.5 Seep on west wall. 30- 1'' I.- •=} 31 to 35 caving; fine-grained sand; 7.5YR5/8 strong brown. 32- j-'cif 34- 1-`, s 34.5 Seep 35 Brecciated siltstone; 7.5YR5/6 strong brown. 36- l~'."• '' 38- .7--:-.-.1 38 Siltstone fragments in silty clayey sand matrix. •40- ''- -r 40.8' slide base N52W 9SW, 41.2' low side, slickensides S23E; siltstone and sandstone fragments in clay gouge. 42- =_; B: N58W dip? 43 Thinly laminated siltstone; 5Y5/3 olive. 44- caving 44 Laminated siltstone with some waxy bentonitic layers; V_: unoxi di zed. 46- ._4 • .....,, ,_._,, 48- -..::-::_-.i 50- .7:-.:-. Hard drilling below 50 feet. 52- — p 52 Fish scales in siltstone. i 54- :-:)-:"1-,==1 55 Some hard siliceous layers. 56- 7.. : .:=4 55 to 57 Fine-grained sandstone with Catalina Schist : " �:- fragments. 58- Total depth 57 feet. • Seepage at 28 feet. 60- Caving 31 to 35 feet. BOREHOLE LOG • Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: B-96-17 Sheet 1 of 1 GPS boringl ovation--;619,64I--ETI7$;721f— GPS boring elevation: 282.3' Drilled by: Tim Gallag}ier 6 GaTlagaier'�6rilTing Service using 30 inch bucket=auger Drilled on: 3/21/96 Logged by: R. Crook using cuttings and downhole method depth lithic attitudes Description (feet) log 0- Landslide debris (0 to 40 feet) lse&ris:pe6&Te to boulder-sized rock fragments in a silty sandy clay 2- matrix; 10YR6.5/3, pale brown. 4- . 6- =a� 8- jG3 10- G {-0 A 12- v 12.5 Bentonitic tuff; pale yellow to pink. 14- 14 Siltstone and siliceous siltstone; 2.5Y5/4, light olive brown. 15 Fine-grained sandstone; hard drilling; cemented; 2.5Y5/4, light 16- olive brown. 18- y 18 Pebble conglomerate with fine-grained sand matrix; cemented; ;� contains fossil snail. 20- 19 Fine-grained sandstone and siltstone; highly weathered and soft;. 10YR5/6, yellowish brown to 5Y6/2, light olive gray. 22- 24- i- • 26- t J 26 Clayey, silty, sandy, gravelly slide debris. 27 Abundant bentonite. 28- 28 Siltstone and fine-grained sandstone; soft & highly weathered; • 7.5YR6/8, reddish yellow. 30- -.v 30 Siltstone and bentonite fragments in clay matrix; stiff. 32- 32 Siltstone; 2.5Y7/4, pale yellow. 32.5 Fine to very fine-grained sandstone; soft; highly weathered; 34- 723 7.5YR5/8, strong brown. 34 Slide debris; gravelly silty sandy clay; 10YR6.5/6 brownish yel. 36- 35 Soft, fine to very fine-grained sandstone; highly weathered; 7.5YR5/8, strong brown. 38- 38 Soft, highly weathered siltstone; 10YR6/6, brownish yellow. 40- 41' Slide base N30W 3SW, slickensides S55W. 42- 7-:-77;- Interlaminated to thinly interbedded siltstone and claystone; hard becoming very hard at bottom; unoxidized; siltstone 2.5Y5/2, gray 44- =-.-- brown; claystone 5Y3/1, very dark gray; organic-rich shale 5Y4/1, dark gray. 46- = F. B: N35W 5SW 42.5 Seepage under pressure on west side of hole. 44 Seepage on west side. 48- _ 46 Siltstone contains fish scales. B: N45W 8SW 49 Few waxy bentonitic layers. 50- ;_ 52- =; Fine-grained sansdtone interlaminated with siltstone. 54- Very hard at bottom. Total depth 55 feet. Seepage under pressure at 42.5 feet. 56- 58- 60- BOREHOLE LOG Project: 1996 PORTUGUESE BEND LANDSLIDE STUDY Boring No.: B-96-18 Sheet 1 of 2 • GPS boring Tocation:fl47617D7T E 17cra GPS boring elevation: 291.8' gher Drilled by: Tim GallaoTIaTlag�ier'6riTling Service using 30 inch buckedauger Drilled on: 3/21/96 Logged by: R. Crook using cuttings and downhole method depth lithic attitudes Description (feet) log 0- Landslide affected material: o to 25' flTT-7or orens1iiaw Blvd.; brecciated bedrock debris with - 2- sandy, silty clay matrix; 10YR6/3, pale brown to 10YR7/1, light gray; hard drilling; mostly blocks of siltstone, siliceous 4- r`c) siltstone and fine-grained sandstone. 6- G ow 8 )� 10- F to 20' Coarse fragments to large rocks in fine-grained gravel. 20- ��' 20 to 28' Fine-grained gravel in sandy silty clay matrix; 1OYR6/4, �� light yellowish brown. 22- 24- • t•;-.7.„..:- 26- c:: _ , 28- I-7.7 28 to 29' Paleosol: silty sandy clay with scattered gravel; 10YR3/2 !.' r= very dark greyish brown. 30- p• 29 Slide debris: siltstone and sandstone fragments in silty clay i--_—_.7 matrix; light yellow-brown to brown; streaked with silty sandy 32- i=F:.: 33 Siltstone, sandstone and bentonite with layers of sandy, silty 34- clay. 34 Paleosol: silty, sandy clay; 10YR4/4, dark yellowish brown. 36- -�� 35 Bentonite and bentonitic tuff; 2.5Y8/2, white. 38- ,' I'_ 40- GL 42- '¢ 42 Layer of siliceous siltstone a few inches thick. 43 Fine-grained bentonitic sandstone; 10YR7.5/4, very pale brown. 44- 45 Bentonite and bentonitic sandstone 46- i . 46 Bentonite with fragments of siliceous siltstone; light gray to reddish brown. 48- 49 Clayey siltstone; 2.5Y5/4, light olive brown_with light gray 50- _• streaks. 52- 53 Very fine-grained silty sandstone; 2.5Y5/4, light olive brown. 54- •-.�' .- 55 Siltstone; 10YR5/6, yellowish brown. 56- = "-. 57 Siltstone; 5Y5/3, olive. 58- 3 58 Sheared siltstone; yellow brown. C' 59 Brecciated siltstone; 10YR5/6, yellowish brown. 60- ; , • 60 Some gray streaks. Boring No.: B_96-18 Sheet 2 of 2 • depth lithic attitudes (feet) log Description 60- 62- �r 64- Horizontal slide base at 64.2 feet, slicks trend directly south. —= B: N5OW 4SW @ 65.5' In place bedrock below 64.2'; thinly interlaminated siltstone 66- and claystone; waxy; partly oxidized brown to black. 67.5' Seepage hissing from west side of hole. 68- { 67 to bottom - interlaminated siltstone and fine-grained sandstone; _— unoxidized; 5Y5/1, gray; contains fish scales. 70- -7-t-77= 7- Total depth 70 feet. Ground water seeping from west wall under pressure at 67.5 feet. •