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Geologic Borings 1996 Portuguese Bend Landslide Study Table B-1 Geologic borings made during 1996 study of Portuguese Bend landslide. Summary of boring locations, III surface elevations, total depth, depth and elevation of slide base, thickness between slide base and top of Portuguese Tuff, and top, thickness and base of Portuguese Tuff (all in feet). Slide Base Thickness Portu uese Tuff Boring Coordinates Surface Total -Logged PVC Slide base Top Thic - ase Base Number North East elev. depth Elev. depth bent to Port. T depth ness de th elev. PBS-1 $4,018,018 E4,178,100 179-X 777-- 1/5.4 1/5.2 -34 209 ZI 7778 _§r- P85-2 $4,018,166 £4,177,724 156.1 190 60 95 96.1 28 124 62 186 -30 PBS-3 N4,018,412 E4,177,839 215.6 216.5 96 118 119.2 27 146 59 204.7 11 P95-4 N4,018,818 E4,177,855 249.3 180 152 95.5 96.6 26 122 53 175 74 PBS-5 $4,019,248 E4,177,948 287.8 181.7 201 85.3 87.0 27 114 58 172.2 116 P85-6 $4,019,632 £4,178,109 310.2 190 222 88.5 86.2 42.5 131 58 189 121 P85-7 $4,019,938 E4,I78,274 298.6 141.6 269 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 P85-9 $4,018,534 £4,179,000 185.1 176 98 68.5 87.4 28.5 107 66 173 12 P85-10 $4,018,350 £4,178,218 170.4 212 44 126 126.5 30 156 53 209 -39 PBS-11 $4,019,410 £4,179,029 279.5 112 (269) fill to 11 feet 34 45 64 109 170 PBS-12 N4,020,321 £4,177,830 340.9 132 313 27.5 - 43.5 71 58 129 212 96W-1 $4,019,489 E4,178,917 276.2 60 247 29 22.2 96W-2 N4,019,561 E4,178,837 279.2 50 247 ca.35 31.0 896-1 N4,018,750 E4,178,946 190 68 150 40.5 B96-2 N4,019,458• E4,178,958 276 30 256 19.5 B96-3 N4,020,562 E4,I78,429 477.4 118 400? 77.8? 896-4 $4,020,392 E4,178,600 464.7 98 374 90.6 B96-5 $4,020,245 £4,178,938 437.4 79 375 62 896-6 N4,019.998 E4,179,066 433.5 108 353 80.5 -- 696-7 N4,020,131 E4,178,863 434.8 118 <317 >118 896-8 N4,020,146 E4,179,0I2 436.7 70 375 62 896-9 N4,020,482 E4,178,763 454.0 65 401 53 896-10 $4,018,866 £4,178,720 185.1 38 158 27.1 B96-11 N4,018,895 £4,178,597 186.7 30 162 24.8 896-12 N4,019,950 E4,178,393 293.5 14 283 10.5 696-13 N4,019,876 E4,178,474 289.3 16 279 10.3 B96-14 N4,019,762 E4,178,598 284.0 40 247 37 III 896-15 N4,019,540* £4,178,460 312* 80 236 76 B96-16 $4,019,714 E4,178,655 283.8 57 243 40.8 896-17 $4,019,641 E4,178,741 282.3 55 241 41 896-18 N4,019,377 E4,178,730 291.8 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 P8S-4 PBS-5 PBS-6 PBS-7 P85-8 PBS-9 PBS-10 896-12 27Z8/96 77:T4 94.31 102./b 7Z:-IS '67:95 52.2 -S= 'Fry 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 53.75 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 •