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Appendix A
411111 Appendix A Historical Borings, Past and On-Going Observation and Pumping Wells • A-i Table A-1, Summary • A-2 Wells: W6B; W2D; W4E; W6I; W6J; W6K; • Nancy, W6A2; 4 Ishibashi Wells; Figueroa; B88-4; B88-5; B88-9; Peppertree; Limetree; Tangerine; Fisher; West, Central and East Sump Wells • A-3 Boring Logs of 1988 • A-4 Station K Movement Records • • • A-1. Table 1, Summary • Table A-1. Summary DATE OF • YEAR FIRST WATER LEVEL DATE OF LAST WATER WELLS/ INSTALLED/ OBSERVATION OR LEVEL MEASUREMENT BORINGS DRILLED LAST PUMPING FEET BELOW CASING HOLES DRILLED BY A 1956-1957 - - PALOS VERDES PROP. B 1956-1957 - 0 " II C 1956-1957 - -3(?) " D 1956-1957 - 0 " " E 1956-1957 - - " II F 1956-1957 - - G 1956-1957 - - " II H 1956-1957 - 10 " I 1956-1957 - - " J 1956-1957 - 207 " II K 1956-1957 - -10(?) " L 1956-1957 - - " M 1956-1957 - - " " N 1956-1957 - - " " 0 1956-1957 - 334 " " P 1956-1957 - 300 " Q 1956-1957 - - " II R 1956-1957 - - " " S 1956-1957 - 37 III T 1956-1957 - 291 " U 1956-1957 - 233 " ✓ 1956-1957 - 255 " " W 1956-1957 - 21 " X 1956-1957 - 25 " Y 1956-1957 - - " ,, Z 1956-1957 - 30 " " AA 1956-1957 - 20 BB 1956-1957 - 52 " II CC 1956-1957 - 54 " DD 1956-1957 - -31(?) " II EE 1956-1957 - 315 " II FF 1956-1957 - 37 " GG 1956-1957 - -7(?) " II HH 1956-1957 - - III I II 1956-1957 - - " JJ 1956-1957 - 291 " II KK 1956-1957 - 67 " LL 1956-1957 - II II - H 11 1 1956-1957 - " 2 1956-1957 - - " " 3 1956-1957 - 0 ', 411) 4 1956-1957 - 27 II 5 1956-1957 II" I6 1956-1957 - - " '. Page 1 Table A-1. Summary ' DATE OF SYEAR FIRST WATER LEVEL DATE OF LAST WATER WELLS! INSTALLED! OBSERVATION OR LEVEL MEASUREMENT BORINGS DRILLED LAST PUMPING FEET BELOW CASING HOLES DRILLED BY 7 1956-1957 - - " 8 1956-1957 - 304 " 9 1956-1957 - -3(?) " " DW-1 1956-1957 - 94 THE DONALD WARREN CO. DW-2 1956-1957 - 326 " II DW-3 1956-1957 - - " DW-4 1956-1957 - 1 II " DW-5 1956-1957 - 137 " DW-6 1956-1957 - - " DW-7 1956-1957 - 47 ft " DW-8 1956-1957 - 0 it " DW-9 1956-1957 - 4 " DW-10 1956-1957 - 5 " " DW-11 1956-1957 - -13(?) " " DW-12 1956-1957 - 2 It DW-13 1956-1957 - 12 " " C-1 1957 - - MACKINTOSH &MACKINTOSH C-2 1957 - - " • C-3 1957 - - " C-4 1957 - - II If C-9 1957 - - U If C-10 1957 - - " C-11 1957 - - " C-12 1957 - - " II A-A 1957 - - L.A. COUNTY A-1 1957 - - " A-2 1957 - - " B-A 1957 - - " B-2 1957 - - " II D-A 1957 - - " II H D-1 1957 - - II If D-2 1957 - - U E-3 1957 - - " II E-4 1957 - - " F-1 1957 - - " F-2 1957 - - " I-1 1957 - - " If K-1 1957 - - " II VV6A 5/11/84 8/20/85-4/29/95 4/29/86-75.62 CITY OF RANCHO PALOS VERDES 0 VVW6A2 7/9/85 8/22/85-4/29/86 8/12/85-79.08 II " VV6B 4/27/84 3/12/85-4/29/86 9/10/84-22.9 " II W2C 5/1/84 - 4/29/86-58.94 " " Page 2 Table A-1. Summary i DATE OF ID' YEAR FIRST WATER LEVEL DATE OF LAST WATER WELLS/ INSTALLED/ OBSERVATION OR LEVEL MEASUREMENT BORINGS DRILLED LAST PUMPING FEET BELOW CASING HOLES DRILLED BY 1N2D 6/1/84 7/16/84-122.49 10/18/96-126.75 " W2F 5/1/84 - 11/16/84-77.92 " " VV6J 5/29/84 6/11/84-66.4 9/9/84-66.63 " W2L 5/11/84 - 12/11/84-93.39 " " V 2M 5/7/84 - 11/16/84-48.00 " " W2H 4/25/84 - 10/22/84-43.17 " " VV6I 6/11/84 6/28/84-109.24 9/23/84-109.78 " II VV6K 6/28/84 3/12/85-4/29/86 9/9/84-53.55 " " W.LMETREE 7/29/85 8/1/85-94.14 10/18/96-93.78 " " W.CHERRY 8/1/85 9/13/85-4/29/86 8/27/85-46.92 W.L.ISHIBAS 8/14/85 3/10/85-4/9/86 - " " W.TANGERN 8/26/87 8/26/87-10/18/96 - " FIGUEROA 6/2/87 6/24/87-8/26/96 " " W FISCHER 5/7/87 8/27/87-10/18/96 - " WI NE 8/26/87 8/26/87-10/18/96 - " II WI EC 8/26/87 8/26/87-10/18/96 - " II WI SE 8/26/87 8/26/87-10/18/96 - " WI W 8/26/87 8/26/87-10/18/96 - " 4110 B88-1 10/11/88 IEHLIG B88-2 10/11/88 II B88-3 10/11/88 H B88-4 10/12/88 11/16/88-17.82 10/18/96-14.04 " B88-5 10/12/88 11/16/88-38.94 10/18/96-31.91 " B88-6 10/12/88 " II B88-7 11/10/88 " " B88-8 11/10/88 " " B88-9 11/10/88 11/16/88-39.62 10/18/96-37.67 " II B88-10 11/28/88 " B88-11 11/30/88 " B88-12 12/6/88 ,. B88-13 12/7/88 11 11 W.SUMP W 7/21/90 7/21/90-10/18/96 - CITY OF RANCHO PALOS VERDES W.SUMP C 7/21/90 7/21/90-10/18/96 - " II W.SUMP E 7/21/90 7/21/90-10/18/96 - II W6K 6/28/84 3/12/85-10/18/96 8/26/96-97.34 .. W.NANCY 6/26/85 9/13/85-10/18/96 3/9/88-72.87 " W4E 5/2/84 6/28/84-33.13 10/18/96-51.81 II VV6A2 7/9/85 4/12/94-10/18/96 - " - W6B 4/27/84 8/18/95-10/18/96 9/10/84-22.29 " opEPPERTREE 5/?/90 5/16/90-29.37 10/18/96 EHLIG PBS-1 2/6/96 - 10/18/96-77.04 EHLIG/BYA Page 3 Table A-1. Summary A DATE OF 0 YEAR FIRST WATER LEVEL DATE OF LAST WATER WELLS/ INSTALLED/ OBSERVATION OR LEVEL MEASUREMENT BORINGS DRILLED LAST PUMPING FEET BELOW CASING HOLES DRILLED BY PBS-2 2/13/96 - 10/19/96-27.28 " PBS-3 2/12/96 - 10/18/96-99.67 " PBS-4 2/8/96 - 10/18/96-76.56 " " PBS-5 2/19/96 - 10/18/96-65.78 " PBS-6 2/14/96 - 10/18/96-53.75 " " PBS-7 2/26/96 - 10/18/96-4.87 " " PBS-8 2/19/96 - 10/18/96-DRY " " PBS-9 2/27/96 - 10/18/96-43 " " PBS-10 3/19/96 - 10/18/96-51.67 " PBS-11 3/20/96 - 5/28/96 " " PBS-12 3/31/96 - 9/24/96-9.12 " 96W-1 1996 - " " 96W-2 1996 - " B96-1 2/5/96 - II " B96-2 2/5/96 - " B96-3 2/6/96 - " II B96-4 2/7/96 - " " B96-5 2/7/96 - " B96-6 2/8/96 - " 0 B96-7 2/8/96 - " B96-8 2/9/96 - " B96-9 2/9/96 - " II B96-10 3/20/96 - " B96-11 3/19/96 - " B96-12 3/20/96 - 5/28/96-9.46 " " B96-13 3/20/96 - " II B96-14 3/21/96 - " B96-15 3/20/96 - " tl B96-16 3/21/96 - " " B96-17 3/21/96 - " B96-18 3/21/96 - " II ill Page 4 • A-2. Wells W6B; W2D; W4E; W6I; W6J; W6K; Nancy, W6A2; 4 Ishibashi • Wells; Figueroa; B88-4; B88-5; B88-9; Peppertree; Limetree; Tangerine; Fisher; West, Central and East Sump Wells • Well W6B PRODUCTION (continued) Meter reading Production Period Gallons Meter reading Production Period Gallons Date in gallons in gallons in days Per dal Date in .aallons in gallons in days ,eer day IV 87 79?;' -r, 63—sou --1-2760- --T - --- -- 9/21/95 1,014,000 10,400 34 306 11/2/95 1,029,300 15,300 42 364 12/15/95 1,044,100 14,800 43 344 1/19/96 1,057,700 13,600 35 389 2/16/96 1,066,700 9,000 28 321 3/29/96 1,082,400 15,700 42 374 4/19/96 1,090,000 7,600 21 362 5/3/96 1,094,800 4,800 14 342 5/28/96 1,103,000 8,200 25 328 6/24/96 1,111,160 8,160 27 302 7/16/96 1,118,400 7,240 22 329 8/2/96 1,123,819 5,419 17 319 8/26/96 1,131,917 8,098 24 337 9/24/96 1,140.358 8,441 29 291 10/18/96 1,147,400 7,042 24 293 11/19/96 1,156,500 9,100 32 284 12/20/96 1,165,100 8,600 31 277 1/20/97 1,174,400 9,300 31 300 2/22/97 1,184,800 10,400 33 315 MONITORING WELL W2D (Portuguese Bend landslide) Location: 70 feet southwest of intersection of Peppertree Dr. and Tangerine Rd.; • Map coordinates: N4,019,400; E4,177,050. Ground elevation: 343 feet. Drilled on 5/31-6/1/84; total depth 150 ft.; cased to 150 ft. Slide base not determined. WATER LEVEL MEASUREMENTS feet below feet below feet below top of top of top of date casing date casing date casing 7/16/84 122.49 1/2/86 122.97 6/11/93 126.74 7/31/84 122.69 1/23/86 122.98 7/26/93 126.87 8/14/84 122.73 2/4/86 122.98 9/14/93 127.07 8/27/84 122.86 2/20/86 123.04 11/23/93 127.06 9/10/84 122.88 3/6/86 123.04 1/11/94 127.09** 9/23/84 122.96 3/20/86 123.05 3/7/94 126.89 10/5/84 122.97 4/9/86 122.95 4/12/94 126.92 10/23/84 123.04 Three year gap 6/16/94 126.97 11/3/84 123.03 3/22/89 124.95 8/3/94 126.93 11/16/84 123.05 5/4/89 125.12 9/6/94 126.97 12/11/84 123.09 6/2/89 125.34 10/10/94 126.86 12/28/84 123.26 6/30/89 125.20 11/15/94 127.09** 1/12/85 123.21 7/13/89 125.28 2/22/95 126.89 1/26/85 123.32 9/11/89 125.33 3/31/95 126.83 2/7/85 123.35 1/1/90 125.58 5/10/95 126.81 3/12/85 122.88 1/31/90 125.51 6/15/95 126.67 3/21/85 122.65 4/19/90 125.49 7/12/95 126.63 4/4/85 122.39 6/5/90 125.81 8/18/95 126.71 4/10/85 122.39 9/20/90 125.82 9/21/95 126.71 4/18/85 122.37 10/17/90 125.90 11/2/95 126.78 4/25/85 122.26* 11/9/90 125.86 12/15/95 126.73 5/16/85 122.49 12/19/90 125.84 1/22/96 126.76 di 6/5/85 122.52 5/15/91 126.06 2/16/96 126.84 7/18/85 122.67 6/11/91 126.16 6/24/96 126.63 7/26/85 122.77 7/3/91 126.16 7/16/96 126.69 8/2/85 122.83 9/16/91 126.18 8/26/96 126.61 8/12/85 122.86 1/1/92 126.32 9/24/96 126.77 8/19/85 122.90 2/8/92 126.32 10/18/96 126.75 8/23/85 122.85 3/18/92 126.41 11/19/96 126.81 8/27/85 122.98 8/15/92 126.49 12/20/96 126.78 9/13/85 122.94 9/23/92 126.46 1/20/97 126.77 9/23/85 123.04 1/1/93 126.72 2/22/97 126.42 10/18/85 122.99 2/3/93 126.78 11/4/85 122.93 4/5/93 126.71 12/11/85 122.97 5/11/93 126.74 * Highest water table recorded. ** Lowest water table recorded. • WELL W4E (Portuguese Bend landslide) 110 Location: Northern part of Portuguese Bend landslide, 260 feet east of Portuguese Canyon. Map coordinates: N4,019,450; E4,177,910 (July, 1984); N4,019,400; E4,177,935 (1995) Ground elevation: 309 feet in July 1984 and 303 in 1995. Drilling started on 5/2/84. Depth of slide base: 90 feet (elevation 219 feet). WATER LEVEL MEASUREMENTS feet below feet below feet below feet below top of top of top of top of date casing date casing date -cca-ssii-ngg date casing 6/2874 MD 11723/85 7374-4- 376791 =TT 77287g5 7E51 7/6/84 35.83 12/11/85 33.59 10/5/91 48.43 5/10/95 52.52 7/16/84 38.01 1/2/86 34.00 1/1/92 49.37 6/15/95 52.11 7/31/84 31.44 1/23/86 34.40 1/25/92 49.60 7/12/95 51.76 8/14/84 30.70 2/4/86 34.37 2/3/92 49.64 8/18/95 51.66 8/27/84 30.52 2/20/86 34.73 3/18/92 50.22 9/21/95 51.96 9/10/84 28.25 3/6/86 35.02 4/4/92 50.38 11/2/95 52.32 9/23/84 28.31 3/20/86 35.28 4/17/92 50.51 12/15/95 52.46 10/5/84 28.57 4/9/86 35.56 5/1/92 50.56 1/22/96 52.44 10/22/84 28.15* 4/29/86 35.69 5/22/92 50.81 2/16/96 52.14 11/3/84 28.84 Three year gap 6/12/92 51.03 3/29/96 51.45 11/16/84 28.95 3/26/89 39.97 7/22/92 51.69 4/19/96 51.21 12/11/84 28.99 6/20/89 40.35 8/15/92 52.03 5/3/96 50.84 12/28/84 28.62 7/13/90 40.74 9/1/92 52.36 5/28/96 50.64 1/12/85 29.12 9/11/89 40.37 9/19/92 52.69 6/24/96 50.54 1/26/85 29.70 12/13/89 42.41 10/10/92 53.64 7/16/96 50.61 2/6/85 30.22 1/1/90 42.49 11/18/92 53.77 8/26/96 50.95 3/12/85 30.82 1/31/90 42.80 1/1/93 54.38 9/24/96 51.38 3/21/85 30.88 3/7/90 42.86 2/3/93 54.74 10/18/96 51.81 4/4/85 30.89 4/12/90 42.96 3/10/93 55.72 11/19/96 52.27 4/10/85 31.04 5/16/90 43.21 4/5/93 57.43 12/20/96 52.55 4/18/85 31.08 6/5/90 43.29 5/11/93 57.96 1/20/97 52.48 4/25/85 31.01 7/21/90 43.87 6/11/93 58.14 2/22/97 51.92 4111 5/16/85 31.37 8/29/90 44.43 7/26/93 58.71 6/5/85 31.48 9/20/90 44.58 9/14/93 59.18 6/14/85 31.57 10/17/90 44.92 11/23/93 59.52** 7/3/85 31.50 11/13/90 45.41 1/11/94 59.26 7/8/85 31.86 11/27/90 45.52 4/12/94 57.68 7/26/85 32.19 12/19/90 45.47 6/16/94 57.61 8/12/85 32.22 2/22/91 45.98 8/3/94 57.28 8/27/85 32.38 4/25/91 46.68 9/6/94 56.98 9/13/85 32.63 5/14/91 46.93 10/10/94 56.78 9/23/85 32.77 6/11/91 47.17 11/15/94 56.83 10/18/85 33.07 7/3/91 47.27 1/20/95 56.83 11/4/85 33.29 8/2/91 47.63 2/22/95 55.93 * Highest water table recorded. ** Lowest water table recorded. • WELL W6I (installed on Nelson property in the western Portuguese Bend landslide) 411 Location: 230 feet west of Peppertree Dr. and 65 feet south of Pomegranite Rd.; Coordinates: N 4,018,750; E 4,175,885; elev. 262 feet'(July, 1984). Drilled on 6/7-11/84; total depth 145 ft.; 6-inch casing to 145 ft. with lower 40 ft. perforated and upper 105 ft. solid; base active slide 125(?) ft., elev. 125(?) ft. WATER TABLE MEASUREMENTS Depth Depth Depth below top below top below top Date of casing Date of casing Date of casing 6/274 -16g17.74'' 7/7F/-84 TO3.3T ' 13/7 -MOW 7/6/84 109.22' 8/14/84 109.59' 9/23/84 pump in well 7/16/84 109.57' 8/27/84 109.63' Water table elevation 153 feet WELL PRODUCTION No. Meter Product. Gal. No. Meter Product. Gal. Date d ys reading in gal_ /day Date des readingeain al. /da 10/4/84 - - 2D 44TOW-M7 -337 10/23/84 19 67,701 67,701 3,563 8/26/87 485 447,310 97,864 202 11/3/84 11 86,492 18,791 1,708 3/26/89 578 498,295 50,985 88 11/16/84 13 102,700 16,208 1,247 4/7/89 12 505,572 7,277 606 12/2/84 16 118,700 16,000 1,000 5/4/89 27 505,572 0 0 12/17/84 15 131,100 12,400 827 6/2/89 29 513,054 7,482 258 12/28/84 11 139,900 8,800 800 6/26/89 24 519,199 6,145 256 1/11/85 14 150,100 10,200 729 7/13/89 17 521,566 2,367 139 1/25/85 14 159,700 9,600 686 9/11/89 60 528,200 6,634 111 2/5/85 11 166,600 6,900 608 10/27/89 56 534,200 6,000 107 2/7/85 2 168,100 1,500 750 1/1/90 66 540,035 5,835 88 2/10/85 3 171,650 3,550 1,183 1/31/90 30 542,937 2,902 97 2/12/85 2 174,100 2,550 1,275 4/14/90 42 549,202 1,325 32 2/13/85 1 174,986* 886 886 6/5/90 52 549,202 0 0 2/14/85 1 175,971* 985 985 9/20/90 107 553,668 4,466 42 2/15/85 1 176,936* 965 965 10/17/90 27 553,668 0 0 2/24/85 9 183,900 6,964 774 11/9/90 23 553,668 0 0 3/12/85 16 194,651 10,751 672 12/19/90 40 553,668 0 0 3/15/85 3 196,619 1,968 656 5/15/91 147 564,000 10,332 70 3/21/85 6 200,270 3,651 609 Not in use, May 1991 to March 1995 3/26/85 5 203,401 3,131 626 1/1/92 water depth 116.23 feet 4/4/85 9 208,332 4,931 548 4/6/95 - 613,060 49,060 - 4/17/85 13 215,755 7,423 571 5/10/95 34 675,370 62,310 1,833 4/25/85 8 219,972 4,217 527 6/15/95 36 680,710 14,340 398 5/15/85 20 226,534 6,562 328 7/12/95 27 687,010 6,300 233 6/5/85 11 226,534 0 0 8/18/95 37 700,950 13,940 377 6/14/85 9 226,541 7 1 9/21/95 34 700,950 0 0 7/1/85 17 245,116 18,575 1,093 11/2/95 42 701,290 340 8 7/8/85 7 248,324 3,208 458 12/15/95 43 746,820 45,530 1,059 7/22/85 14 255,707 13,383 956 1/22/96 38 772,150 25,330 667 7/26/85 4 257,697 1,990 498 2/16/96 25 778,940 6,790 272 8/12/85 17 264,822 7,125 419 3/29/96 42 797,850 18,910 450 8/15/85 3 266,194 1,372 457 6/24/96 87 839,290 41,440 476 8/27/85 12 271,017 4,823 402 7/16/96 22 853,350 14,060 639 9/3/85 7 274,408 3,391 484 8/26/96 41 888,430 35,080 856 9/13/85 10 278,200 3,792 379 9/24/96 29 922,180 33,750 1,164 9/23/85 10 281,836 3,636 364 10/18/96 24 932,770 10,590 441 10/10/85 17 287,695 5,859 345 11/19/96 32 932,810 40 1 10/18/85 8 290,369 2,674 334 12/20/96 31 932,810 0 0 11/4/85 17 295,486 5,117 301 1/20/97 31 945,790 12,980 419 12/7/85 23 304,700 9,214 401 2/22/97 33 963,790 18,000 545 12/11/85 4 305,179 479 120 12/27/85 16 310,053 4,874 304 1/2/86 6 311,473 1,420 237 1/23/86 21 317,584 6,111 291 2/4/86 12 321,288 3,704 309 2/20/86 16 325,595 4,307 269 3/6/86 14 331,287 5,692 407 3/20/86 14 337,141 5,854 418 4/1/86 12 344,468 7,327 611 4/9/86 7 348,707 4,239 606 * Readings by Daphne Clarke WELL W6J (installed on Bara property in western Portuguese Bend landslide) • Location: 65 feet west of Peppertree Dr. and 300 feet south of Pomegranite Rd.; coordinates - N 4,018,755; E 4,175,960; elev. 207 feet (July, 1984). Drilled on 5/25-29/84; total depth 120 ft.; 6-inch casing to 110 ft. with lower 40 ft. perforated and upper 70 ft. solid; probable base active slide at 93 ft. WATER TABLE MEASUREMENTS Depth Depth Depth below top below top below top Date of casing Date of casing Date of casinj 6/177$4 --IT1101 771784 --6-6 747 ' $/277$4 --b'6:T2' 6/28/84 66.39' 7/31/84 66.50' 9/9/84 66.63' (elevation 139') 7/6/84 66.37' 8/14/84 66.53' 9/23/84 pump in well WELL PRODUCTION No. Meter Product. Gal. No. Meter Product. Gal. Date d's readin in gal. /dad Date days readingin gal. /day 10/4/84 - - - Ol- -- - - -673D7$9 57 13-r4757 73781"7- -41B- 10/23/84 19 47,395 43,382 2,283 7/13/89 13 814,597 0 0 11/3/84 11 63,220 15,825 1,439 9/11/89 60 830,450 15,853 264 11/16/84 13 76,450 13,230 1,018 1/1/90 112 852,290 21,840 195 12/2/84 16 90,400 13,950 872 1/31/90 30 856,640 4,350 145 12/17/84 15 102,300 11,900 793 4/14/90 73 868,550 11,910 163 12/28/84 11 110,500 8,200 745 6/5/90 52 880,456 11,906 229 1/11/85 14 120,700 10,200 729 9/20/90 107 890,002 9,546 89 1/25/85 14 130,400 9,700 693 10/17/90 27 891,863 1,861 69 2/5/85 11 137,700 7,300 664 Not in use November 1990 to March 1995 2/7/85 2 138,900 1,200 600 1/1/91 water depth 77.42' 2/10/85 3 140,800 1,900 633 4/6/95 - 3,211,430 2/12/85 2 142,150 1,350 675 5/10/95 34 3,244,300 32,870 967 2/13/85 1 142,500* 350 350 6/15/95 36 3,267,420 23,120 642 2/14/85 1 143,149* 649 649 7/12/95 27 3,267,430 10 0 2/15/85 1 143,779* 630 630 8/18/95 37 3,297,180 29,750 804 0 2/24/85 9 149,494 5,715 635 9/21/95 34 3,315,180 18,000 529 3/15/85 19 161,538 12,044 634 11/2/95 42 3,320,280 5,100 121 3/21/85 6 165,206 3,668 611 12/15/95 43 3,320,280 0 0 3/26/85 5 168,122 2,916 583 1/22/96 38 3,320,310 30 1 4/4/85 9 173,087 4,965 552 2/16/96 25 3,320,310 0 0 4/17/85 13 180,379 7,292 561 3/29/96 42 3,320,310 0 0 4/25/85 8 184,440 4,061 508 6/24/96 87 3,320,320 10 0 5/15/85 20 194,700 10,260 513 7/16/96 22 3,335,010 14,690 668 6/5/85 21 205,002 10,302 491 8/26/96 41 3,341,180 6,170 248 7/3/85 28 218,543 13,541 484 9/24/96 29 3,346,600 5,420 187 9/3/85 62 246,734 28,191 455 10/18/96 24 3,348,710 2,110 88 10/10/85 37 262,341 15,607 422 11/19/96 32 3,348,840 130 4 12/27/85 79 293,207 30,866 391 12/20/96 31 3,354,840 6,000 194 4/1/86 95 328,691 35,484 374 1/20/97 31 3,360,380 5,540 179 8/67/87 (disconnected) 2/22/97 33 3,365,510 5,130 155 3/26/89 790,780 - - 5/4/89 39 790,780 0 0 * meter reading by Daphne Clarke WELL W6K and replacement well Cherryhill West • Location: Inside west-center of Cherryhill Lane loop. Cherryhill West 25 feet south of W6K. Map coordinates: N4,018,300; E4,177,030. Ground elevation: 187 feet (July 1984) N4,018,060; E4,177,040. Ground elevation: 181 feet (1995) W6K drilled: 6/84. Bottom of W6K at 129.5 feet on 7/16/96. Depth to base of slide at least 130 feet. WATER LEVEL MEASUREMENTS (Depth in Feet Below Top of Casing) Date Depth Date Depth Date Depth. Date Depth Date Depth Date Depth Date Depth 6728784 T 772T788" -972078159/.2 278/92 737 1172779-3 �7 T 27227'5 OT 2/16/96 7/6/84 53.79 5/4/89 96.92 10/17/90 97.34 3/18/92 95.72 1/11/94 97.51 3/31/95 96.97 3/29/96 97.62 7/16/84 53.80 6/2/89 96.31 11/9/90 97.37 8/15/92 83.61 3/7/94 97.32 5/10/95 96.78 6/24/96 97.19 7/31/84 53.68 7/13/89 96.24 12/19/90 97.17 9/23/92 96.18 4/12/94 97.08 6/15/95 94.98 7/16/96 97.36 8/14/84 53.63 9/11/89 91.52 5/15/91 96.74 1/1/93 97.02 6/16/94 97.25 7/12/95 96.71 8/26/96 97.34 8/27/84 53.65 10/27/89 97.63 6/11/91 97.14 2/3/93 97.18 8/3/94 97.23 8/18/95 96.84 Returned to 9/9/84 53.55 1/1/90 97.14 7/3/91 97.12 4/5/93 97.24 9/6/94 94.86 9/21/95 96.89 production Producing well 1/31/90 97.69 9/16/91 97.09 5/11/93 97.21 10/10/94 95.91 11/2/95 97.12 1985 to 1989 4/14/90 97.59 11/4/91 97.06 6/11/93 96.72 11/17/94 97.04 12/15/95 97.07 3/10/88 81.33 6/5/90 97.50 1/1/92 97.03 9/14/93 96.37 1/13/95 97.22 1/22/96 97.28 WELL PRODUCTION IN GALLONS No. Meter Pro- Gallons No. Meter Pro- Gallons Dates reading duction perad dDate Days readin duction perdaa 3712785 - 3!,434" - '971671 - 174E37M T2?7 -L-640'- 3/21/85 9 64,740 27,306 3,034 11/4/91 49 1,554,950 71,940 1,468 4/4/85 14 78,440 13,700 979 1/1/92 48 1,636,820 81,870 1,706 4/10/85 6 86,870 8,430 1,405 2/8/92 38 1,690,530 53,710 1,413 4/18/85 8 96,247 9,377 1,172 3/18/92 39 1,745,020 54,490 1,397 4/25/85 7 100,146 3,899 557 8/15/92 150 2,045,270 300,250 2,002 5/16/85 21 127,023 26,877 1,280 9/23/92 39 2,162,840 117,570 3,015 6/5/85 20 144,516 17,493 875 1/1/93 100 2,298,130 135,290 1,353 6/14/85 9 151,862 7,346 816 2/3/93 33 2,325,560 27,430 831 7/8/85 24 169,310 17,448 727 4/5/93 61 2,383,260 57,700 946 7/26/85 18 184,556 25,246 847 5/11/93 36 2,410,390 27,130 754 • 8/2/855 7 189,259 4,703 672 6/11/93 31 2,433,620 23,230 749 8/12/85 10 198,076 8,817 882 7/26/93 45 2,467,740 34,120 758 8/27/85 15 210,175 12,099 807 9/14/93 50 2,496,650 28,910 578 9/13/85 17 225,450 15,225 899 11/23/93 70 2,546,780 50,130 716 9/23/85 10 233,244 7,794 779 1/11/94 48 2,581,090 34,310 715 10/18/85 25 252,469 19,225 769 3/7/94 55 2,625,090 44,000 800 11/4/85 17 264,912 12,443 732 4/12/94 36 2,665,320 40,230 1,117 12/11/85 37 508,655 233,743 6,588 6/16/94 65 2,737,930 72,610 1,117 1/2/86 22 592,040 91,385 3,790 8/3/94 48 2,785,510 47,580 991 1/23/86 21 662,831 70,791 3,371 9/6/94 34 2,818,670 33,160 975 2/4/86 12 700,905 38,074 3,173 10/10/94 34 2,850,920 32,250 949 2/20/86 16 746,868 45,963 2,873 11/17/94 38 2,888,310 37,390 984 3/6/86 14 767,784 20,916 1,307 1/13/95 57 2,947,300 58,990 1,035 3/20/86 14 780,384 12,600 900 2/22/95 40 2,992,480 45,180 1,129 4/9/86 20 935,040 154,656 7,733 3/31/95 37 3,044,330 51,850 1,401 4/29/86 20 1,183,243 248,203 12,410 5/10/95 40 3,089,050 44,720 1,118 8/26/87 485 1,783,118 599,875 1,237 6/15/95 36 3,129,370 40,320 1,120 Cherryhill West 7/12/95 27 3,161,250 31,880 1,181 3/26/89 - 122,409 - - 8/18/95 37 317,080 - - 4/7/89 12 140,693 18,284 1,524 9/21/95 34 367,790 50,710 1,491 5/4/89 27 180,250 39,557 1,465 11/2/95 42 428,360 60,570 1,442 6/2/89 29 218,690 38,440 1,326 12/15/95 43 487,810 59,450 1,383 6/30/89 28 253,994 35,304 1,261 1/22/96 38 539,270 51,460 1,354 7/13/89 13 271,510 17,516 1,347 2/16/96 25 572,250 32,980 1,319 9/11/89 60 342,875 71,365 1,189 3/29/96 42 627,200 54,950 1,308 10/27/89 46 409,550 66,675 1,449 6/24/96 87 738,710 111,510 1,282 1/1/90 66 499,240 89,690 1,359 7/16/96 23 766,320 27,610 1,200 1/31/90 30 541,170 41,930 1,398 8/26/96 41 818,180 51,860 1,265 4/14/90 73 657,570 116,400 1,595 9/16/96 . 21 837,980 6,710*19,800* 943* 6/5/90 52 732,870 75,300 1,448 9/24/96 8 843,110 11,340 9,760*1,220 9/20/90 107 907,330 174,460 1,630 10/18/96 24 861,950 21,463 28,963 1,207 10/17/90 27 952,450 45,120 1,671 11/19/96 32 885,450 36,550 38,587 1,206 11/9/90 23 991,060 38,610 1,679 12/20/96 31 907,330 51,770 37,100 1,197 • 12/19/90 40 1,057,240 66,180 1,654 1/20/97 31 929,040 67,410 37,350 1,205 5/15/91 148 1,264,820 207,580 1,403 2/22/97 33 953,870 83,220 40,640 1,232 6/11/91 27 1,319,120 54,300 2,011 * W6K returned to production; total on 7/3/91 22 1,360,030 40,910 1,860 9/24/96 doesn't include W6K. WELL NANCY (Portuguese Bend Landslide) • Location: West side Portuguese Canyon, 350 feet west of intersection of Sweetbay Road and Peppertree Drive. Map coordinates; N4,019,802; E4,177,477 Ground elevation: 377 feet. (Coordinates for July, 1985) Drilled July 1985. Depth of slide base 144 feet (elevation 233 feet). WATER LEVEL MEASUREMENTS URI:---�-- ---- 7/26/85 8/12/85 3/9/88 Feet below top of casing: $2- -OT -777 87 WELL PRODUCTION WELL PRODUCTION Meter readingTroducfTon Period Gallons Meter reading Poducfion Period Gallons Date in gallons in gallons in des Per dm Date in gallons in gallons in days per�d�ay 97x3785 'x;337 -- --- --- - 171134 3; ri06 71,400-- 49 2;457 9/23/85 30,681 26,350 10 2,635 3/7/94 3,472,700 94,100 55 1,711 10/18/85 88,316 57,635 25 2,305 4/12/94 3,531,600 58,900 36 1,636 11/4/85 125,440 37,124 17 2,184 6/16/94 3,637,300 105,700 65 1,626 11/23/85 165,473 40,033 19 2,107 8/3/94 3,709,400 72,100 48 1,502 12/11/85 200,542 35,069 18 1,948 9/6/94 3,756,800 47,400 34 1,394 1/2/86 243,779 43,237 22 1,965 10/10/94 3,792,600 35,800 34 1,053 1/23/86 282,503 38,724 21 1,844 11/15/94 3,833,200 40,600 35 1,160 2/4/86 304,700 22,197 12 1,850 1/13/95 3,905,200 72,000 59 1,220 2/20/86 334,008 29,308 16 1,832 2/20/95 3,954,600 49,400 38 1,300 3/6/86 358,791 24,783 14 1,770 3/31/95 4,011,000 56,400 39 1,446 3/20/86 383,431 24,640 14 1,760 5/10/95 4,063,600 52,600 40 1,315 4/1/86 404,639 21,208 12 1,767 6/15/95 4,123,500 59,900 36 1,664 4/9/86 418,402 13,763 8 1,720 7/12/95 4,159,900 36,400 27 1,348 4/29/86 451,618 33,216 20 1,661 8/18/95 4,221,500 61,600 37 1,665 8/26/67 1,230,900 779,282 485 1,607 9/21/95 4,285,800 64,300 34 1,891 9/7/85 1,248,046 17,146 12 1,429 11/2/95 4,368,300 82,500 42 1,964 3/26/89 1,839,743 591,697 565 1,047 12/15/95 4,445,900 77,600 43 1,805 4/7/89 1,853,744 14,001 12 1,167 1/22/96 4,448,200 2,300 32 72 5/4/89 1,884,062 30,318 27 1,123 2/16/96 4,483,600 35,400 31 1,142 6/2/89 1,913,572 29,510 29 1,018 3/29/96 4,539,700 56,100 42 1,336 • 7/13/89 1,951,559 37,987 41 927 6/24/96 4,643,500 103,800 87 1,193 9/11/89 2,003,300 51,741 60 826 7/16/96 4,672,800 29,300 22 1,332 10/27/89 2,045,700 42,400 46 922 8/16/96 4,726,100 53,300 41 1,300 1/1/90 2,104,000 58,300 66 833 9/24/96 4,762,900 36,800 29 1,269 1/31/90 2,128,733 24,733 30 824 10/18/96 4,792,600 29,700 24 1,237 4/13/90 2,198,900 70,167 72 975 11/19/96 4,830,300 37,700 32 1,178 6/5/90 2,241,500 42,600 53 804 12/20/96 4,867,200 36,900 31 1,190 9/20/90 2,341,952 100,452 107 939 1/20/97 4,904,200 37,000 31 1,194 10/17/90 2,367,100 25,148 27 931 2/22/97 4,945,400 41,200 33 1,249 11/9/90 2,386,549 19,449 23 846 12/19/90 2,391,400 4,851 40 121 2/22/91 2,415,500 24,100 34 709 6/11/91 2,500,137 84,637 109 776 7/3/91 2,515,000 14,863 22 676 8/12/91 2,534,810 19,810 30 660 9/16/91 2,564,023 29,213 45 649 10/5/91 2,575,241 11,218 19 590 11/4/91 2,585,100 9,859 30 329 1/1/92 2,626,001 41,901 57 735 2/3/92 2,650,900 24,899 33 755 3/18/92 2,675,800 24,900 43 579 4/4/92 2,684,400 8,600 17 506 5/1/92 2,702,600 18,200 27 674 5/22/92 2,717,900 15,300 21 729 6/12/92 2,731,700 13,800 21 657 7/22/92 2,741,700 10,000 40 250 8/10/92 2,746,700 5,000 19 263 9/19/92 2,766,200 19,500 40 487 10/10/92 2,782,900 16,700 21 795 _ . 11/5/92 2,803,700 20,800 26 800 1/1/93 2,853,500 49,800 57 874 2/3/93 2,887,400 33,900 33 1,027 3/22/93 2,942,200 54,800 47 1,166 • 4/5/93 2,959,400 17,200 14 1,229 5/11/93 3,007,500 48,100 36 1,336 6/11/93 3,052,200 44,700 31 1,442 7/26/93 3,120,500 68,300 45 1,518 9/14/93 3,199,000 78,500 50 1,570 11/23/93 3,307,200 108,200 70 1,546 WELL W6A2 PRODUCTION (continued) • Meter reading Production Period Gallons Date in gallons in _gallons in djs Per day 4712794 /,0257010-U 3154O-- --3"6" 07 8 6/16/94 7,660,530 634,640 65 9,764 8/3/94 8,022,010 361,480 48 7,531 9/6/94 8,300,420 278,410 34 8,189 10/10/94 8,566,690 266,270 34 7,831 11/17/94 8,845,600 278,910 38 7,340 1/13/95 9,375,180 529,580 57 9,291 2/26/95 9,751,830 376,650 44 8,560 3/31/95 10,055,540 303,710 33 9,203 5/10/95 335,870 280,033 40 7,008 6/15/95 666,030 330,160 36 9,171 7/12/95 885,070 219,040 27 8,113 8/18/95 1,304,650 419,580 37 11,340 9/21/95 1,661,580 357,930 34 10,527 11/2/95 2,063,440 401,860 42 9,568 12/15/95 2,424,190- 360,750 43 8,390 1/22/96 2,670,050 245,860 38 6,470 2/16/96 2,839,470 169,420 25 6,777 3/29/96 3,084,730 245,260 42 5,840 6/24/96 3,546,510 461,780 87 5,308 7/16/96 3,665,750 119,240 23 5,420 8/26/96 3,914,140 248,390 41 6,058 9/24/96 4,177,480 263,340 29 9,081 10/18/96 4,394,130 216,650 24 9,027 11/19/96 4,646,330 252,200 32 7,881 12/20/96 4,870,320 223,990 31 7,225 1/20/97 5,095,450 225,130 31 7,262 2/22/97 5,300,920 205,470 33 6,226 . Production log of Ishibashi wells continued. Alik 111, WELL PRODUCTION IN GALLONS Ish. NE Ish. EC Ish. SE Ish. W Period a -Pro=- Gal/ Nair 1Tro- Gal/ Na r-fro-mal/ -MTrffer--Pro- Gal/ Date days readin duction da readin duction da reading_ duction da readin duction da 4757173--2 - 5-;r60---rou -4- 753,7 U --6a-6 1,8 -�OaU 37 7177M-87g21). 5/11/93 36 45,250 90 3 754,800 1,200 33 1,845,800 6,890 191 931,820 14,750 410 6/11/93 31 49,410 4,160 134 755,000 200 6 1,849,310 3,510 113 942,460 10,640 343 7/26/93 45 54,680 5,270 117 755,000 0 0 1,853,540 4,230 94 959,930 17,470 388 9/14/93 49 59,950 5,270 108 755,000 0 0 1,854,640 1,100 22 977,260 17,330 354 11/23/93 70 65,390 4,440 63 130 - - 1,864,120 9,480 135 977,260 0 0 1/11/94 49 65,390 0 0 2,480 2,350 48 1,886,730 22,610 461 977,260 0 0 3/17/94 55 65,390 0 0 7,400 4,920 89 1,905,960 19,230 350 979,900 2,690 48 4/12/94 36 65,390 0 0 11,060 3,540 98 1,918,700 12,740 354 980,100 200 6 6/16/94 65 65,390 0 0 20,250 9,190 141 1,943,080 24,380 375 993,280 13,180 205 8/13/94 48 65,390 0 0 20,380 130 3 1,962,620 19,540 407 1,006,340 13,060 272 9/6/94 34 65,390 0 0 33,270 12,890 379 1,974,300 11,680 344 1,014,910 8,570 252 10/10/94 34 65,390 0 0 37,300 4,030 119 1,983,670 9,370 276 1,025,220 10,310 303 11/17/94 38 65,390 0 0 44,160 6,860 181 1,999,330 15,660 412 1,036,440 11,220 295 1/20/95 64 65,390 0 0 54,810 10,650 166 2,018,240 18,910 295 1,055,570 19,130 299 2/20/95 31 65,390 0 0 61,390 6,580 212 2,024,780 6,540 211 1,066,870 11,300 365 3/28/95 34 65,390 0 0 68,370 6,980 205 2,029,820 5,040 148 1,082,450 15,580 458 5/10/95 43 65,390 0 0 76,920 8,550 199 2,031,880 2,060 48 1,108,350 25,900 602 6/15/95 36 65,390 0 0 83,720 6,800 189 2,031,910 5,030 140 1,128,100 19,750 549 7/12/95 27 65,390 0 0 88,530 4,810 178 2,031,920 10 0 1,141,740 13,640 505 8/18/95 37 65,390 0 0 93,990 5,460 148 2,031,930 10 0 1,160,070 18,330 495 9/21/95 34 65,390 0 0 98,680 4,690 138 2,031,930 0 0 1,175,870 15,800 465 11/2/95 42 65,390 0 0 104,940 6,260 149 3,082,740 - - 1,191,800 15,930 379 12/15/95 43 62,410 - - 109,030 4,090 95 3,090,970 8,230 191 1,211,160 19,360 450 1/22/96 38 55,080 - - 111,710 2,680 71 3,101,670 10,700 282 1,227,880 16,720 440 2/16/96 25 55,060 - - 113,420 1,710 68 3,109,840 8,170 327 1,238,200 10,320 413 3/29/96 42 52,230 - - 115,930 2,510 60 3,122,500 12,660 301 1,255,070 16,870 402 4/19/96 21 47,780 - - 116,860 930 44 3,128,380 5,880 280 1,263,000 7,930 378 5/3/96 14 44,210 - - 117,120 260 19 3,640,260 3,640 260 1,267,470 4,470 319 . 5/28/96 25 38,690 - - 118,610 1,490 60 3,138,300 6,280 251 1,275,830 8,360 334 6/24/96 27 31,300 120,360 1,750 65 3,144,640 6,340 235 1,284,880 9,050 335 7/16/96 22 24,320 - - 121,480 1,080 49 3,149,320 4,680 213 1,291,800 6,920 315 8/2/96 17 21,680 - - 121,653 173 10 3,152,801 3,481 205 1,297,070 5,270 310 8/26/96 24 18,730 - - 121,650 0 0 3,157,700 4,899 204 1,304,810 7,740 322 9/24/96 29 18,100 - - 121,653 0 0 3,163,570 5,870 202 1,315,190 10,380 358 10/18/96 24 18,004 - - 121,653 0 0 3,168,600 5,030 210 1,323,930 8,740 364 11/19/96 32 16,940 - - 121,653 0 0 3,175,370 6,770 212 1,335,160 11,230 351 12/20/96 31 16,930 - - 121,653 0 0 3,175,790 420 14 1,346,320 11,160 360 1/20/97 31 16,930 - - 121,653 0 0 3,175,790 0 0 1,357,630 11,310 365 2/22/97 33 16,910 - - 121,653 0 0 3,176,810 1,020 31 1,370,510 12,880 390 4111 Montoring Wells B88-4, B88-5 and 688-9 (in the Portuguese Bend landslide). • Well location L elevation and depth L and elevation of slide base in July 1996 B88-4: Coordinates N4,020,278 E4,177,677; casing top 343'; casing depth 23'; slide base 281'. B88-5: Coordinates N4,019,770 E4,178,530; casing top 299'; casing depth 43'; slide base 254'. B88-9: Coordinates N4,019,230 E4,178,305; casing top 304'; casing depth 70'; slide base 233'. WATER LEVEL DEPTH BELOW TOP OF WELL CASING Date B88-4* B88-5 B88-9 Date B88-4 B88-5 B88-9 Date B88-4 B88-5 B88-9 11716/88. T7:87 -311:97j 7976'2" 76730/91 74:7$ 7427 37210-6 'MDT x2726' $: '3 11/28/88 - 38.92 39.43 1/1/92 - 45.25 42.74 6/24/96 13.04 32.64 38.92 2/1/89 16.88 38.83 39.59 2/3/92 - 45.29 42.80 7/16/96 13.13 33.10 38.97 3/21/89 16.32 38.83 39.82 3/18/92 - 43.63 42.91 8/2/96 13.30 33.29 38.93 4/13/89 16.16 - - 4/4/92 - 30.56 42.92 8/26/96 13.55 31.92 38.22 5/4/89 15.82 39.16 39.74 4/17/92 - 32.97 42.56 9/24/96 13.97 31.40 37.72 6/2/89 15.75 39.31 39.99 5/1/92 - 36.79 42.48 10/18/96 14.04 31.91 37.67 6/20/89 15.60 39.29 39.88 5/22/92 - 40.90 42.62 11/19/96 14.32 32.21 37.44 7/13/89 15.51 39.28 40.01 6/12/92 - 42.34 42.61 12/20/96 13.61 31.82 36.90 9/11/89 15.16 33.46 39.29 7/22/92 - 43.32 42.69 1/20/97 12.90 28.75 36.48 9/12/89 - 33.59 - 8/15/92 - 43.72 42.77 2/22/97 11.11 29.43 35.91 9/14/89 - 33.77 - 9/1/92 - 44.04 42.79 9/20/89 - 34.39 39.39 9/19/92 - 44.16 42.44 10/17/89 - 35.81 - 10/10/92 - 44.52 43.02 10/27/89 14.92 - - 11/18/92 - 44.84 42.84 11/11/89 - 36.32 - 1/1/93 - 45.11 42.99 12/13/89 14.71 36.81 39.60 2/3/93 - 30.02 42.54 1/1/90 14.68 36.62 39.68 3/12/93 22.21 34.37 41.73 1/31/90 14.52 36.51 39.48 4/5/93 - 27.32 41.08 3/7/90 14.48 36.94 39.73 5/11/93 - 28.96 40.86 4/12/90 14.49 37.11 39.73 6/11/93 - 30.56 41.09 4/19/90 - - - 7/26/93 - 34.79 40.01 5/16/90 14.46 37.45 39.92 9/14/93 - 38.11 40.16 • 6/5/90 14.38 37.54 39.38 11/23/93 40.94 40.32 7/3/90 40.07 40.42 1/11/94 41.96 40.46 7/21/90 14.48 42.02 40.58 2/24/94 - 41.09 40.41 8/29/90 14.58 - 41.02 4/12/94 - 35.54 40.68 9/20/90 - 42.33 41.01 6/16/94 - 41.02 40.53 10/3/90 14.54 42.74 - 8/3/94 - 41.33 40.66 10/17/90 14.54 42.62 41.36 9/6/94 - 40.64 40.78 10/30/90 - 42.86 - 10/10/94 - 39.13 40.80 11/2/90 14.33 - 41.32 11/15/94 - 40.68 41.04 11/9/90 - - 41.46 1/20/95 - 24.06 40.54 11/13/90 14.76 42.96 - 2/22/95 - 22.21 39.32 11/27/90 15.51 43.08 41.65 3/14/95 - 18.39 - 11/30/90 15.58 - - 3/28/95 - 24.99 38.13 12/6/90 15.84 - - 5/10/95 - 23.96 37.16 12/19/90 16.16 43.11 41.51 6/15/95 - 25.12 34.61 2/22/91 18.01 42.14 41.64 7/12/95 - 29.29 36.07 4/25/91 20.16 42.41 41.64 8/18/95 - 30.05 37.46 5/14/91 20.93 42.91 41.94 9/21/95 - 31.21 37.63 5/30/91 21.44 - - 11/2/95 - 30.81 38.19 6/11/91 21.76 43.34 42.10 12/13/95 - 30.32 38.46 7/3/91 21.83 43.64 42.21 1/19/96 - 30.27 38.63 8/2/91 21.91 41.98 42.39 3/29/96 - 28.76 38.80 9/16/91 - 42.60 42.53 4/19/96 12.81 31.19 38.88 10/5/91 - 44.63 42.51 5/3/96 12.93 31.37 38.76 * Readings before 10/3/90 adjusted for removal of 8.0 feet from top of casing after grading removed earth from area. PEPPERTREE WELL (Portuguese Bend landslide) • Location: 370 feet northeast of Sweetbay Road and 140 feet west of Peppertree Drive Map coordinates: N4,020,265• E4,177,345 (1996) Ground elevation: 364 feet (1996) Other data: Drilled in May 1990. Depth of slide base 97 feet. WATER LEVEL MEASUREMENTS Date: 5/16/90 5/23/90 6/5/96-7/21/907779/90 10/17/90 Feet below top of casing: -21)-.77- X9:SW 2944' -797-611- -2 -79:72-- WELL PRODUCTION WELL PRODUCTION Meter reading7roductiTF Period Gallons Meter reading'-rockfl on Period Gallons Date in .allons in gallons in dam per dal Date in gallons in gallons in days per da 775/90 TTY (well starred) 0 - 776776 5,033 6 T18 g U ----4T- 2tgUr 11/9/90 39,010 39,000 4 9,750 9/24/96 5,164,520 70,840 29 2,443 11/30/90 141,990 102,980 21 4,904 10/18/96 5,226,840 62,320 24 2,597 12/19/90 203,645 61,655 19 3,245 11/19/96 5,310,370 83,530 32 2,610 2/22/91 358,000 154,355 65 2,375* 12/20/96 5,389,470 79,100 31 2,552 4/25/91 905,390 - 65 - 1/20/97 5,471,630 82,160 31 2,650 6/11/91 45,850 - 46 - 2/22/97 190 - 33 - 7/3/91 2,890 - 22 - 8/2/91 44,810 41,920 30 1,397 9/16/91 93,564 48,754 45 1,083 10/5/91 124,170 30,606 19 1,611 10/30/91 175,390 51,220 25 2,049 1/1/92 365,270 189,880 63 3,014 2/8/92 532,680 167,410 38 4,406 3/18/92 690,240 157,560 39 4,040 4/4/92 720,960 30,720 17 1,807 5/1/92 722,140 21,180 27 784 5/22/92 749,180 27,040 21 1,288 6/12/92 788,780 39,600 21 1,886 7/22/92 97,680 - - 8/10/92 152,800 55,120 19 2,901 9/19/92 260,950 108,150 40 2,704 • 10/10/92 316,410 55,460 21 2,641 11/5/92 383,610 67,200 26 2,585 11/18/92 417,240 33,630 13 2,587 1/1/93 526,560 109,320 44 2,485 2/3/93 578,257 51,697 33 1,567 3/22/93 696,580 108,323 47 2,518 4/5/93 733,170 36,590 14 2,614 5/11/93 826,040 92,870 36 2,580 6/11/93 904,580 78,540 31 2,536 7/26/93 1,018,340 113,760 45 2,528 9/14/93 1,149,210 130,870 62 2,111 11/23/93 1,320,360 171,150 70 2,445 1/11/94 1,429,290 108,930 49 2,223 3/7/94 1,550,470 121,180 55 2,203 4/12/94 1,618,660 68,190 36 1,894 6/16/94 1,733,270 114,610 65 1,763 8/3/94 1,764,090 30,820 48 642 9/6/94 1,804,170 40,080 34 1,179 10/10/94 1,834,620 30,450 34 895 11/15/94 1,863,490 28,870 36 802 1/13/95 73,750 - 58 - 2/22/95 139,480 65,730 40 1,643 4/6/95 205,620 66,140 43 1,538 5/10/95 243,110 37,490 34 1,103 6/15/95 281,810 38,700 36 1,075 7/12/95 281,810 - 27 - 8/18/95 3,879,210 - 37 - 9/21/95 3,984,460 96,539 34 2,839 11/2/95 4,122,210 137,750 42 3,280 12/15/95 4,252,280 130,070 43 3,025 1/22/96 4,366,920 114,640 38 3,017 2/16/96 4,456,670 89,750 25 3,590 3/29/96 4,649,290 192,620 42 4,586 6/24/96 4,914,080 264,790 87 3,044 • 7/16/96 4,974,700 60,620 22 2,755 * Meter stuck at time of reading LIMETREE MONITORING WELL (Portuguese Bend landslide) 0 Location: 40 feet north of Limetree Lane, 150 feet northwest of intersection of Limetree and Cherry Hill Lanes. Map coordinates: N4,018,850• E4,177,225 (July, 1984). N4,018,795; E4,177,215 (1995) Ground elevation: 284 feet (July, 1984); 281 feet (1995). Drilled: 7/25-29/85. Depth to base of slide 120 feet, elevation 164 feet. Well 114.5 feet deep on 3/26/89 and 10/18/96. WATER LEVEL MEASUREMENTS Feet below Feet below Feet below Date to_p of casing Date topof casing Date to as of cing 8/1/85 - '3.T4- 2777 13:76- T17rms --9779- 8/12/85 93.58 3/18/92 99.03 12/20/96 93.86 8/27/85 93.21 8/15/92 99.26 1/20/97 93.96 9/13/85 92.84 9/23/92 99.38 2/22/97 93.85 9/23/85 92.73 1/1/93 99.39** 10/18/85 92.60 2/3/93 98.97 11/4/85 92.48 4/5/93 97.82 11/23/85 92.34 5/11/93 97.11 12/11/85 92.19 6/11/93 96.57 1/2/86 92.04 7/26/93 95.92 1/23/86 91.90 9/14/93 95.48 2/4/86 91.87 11/23/93 94.89 2/20/86 91.92 1/11/94 94.61 3/6/86 91.90 3/7/94 94.36 3/20/86 91.89 4/12/94 94.23 4/9/86 91.53 6/16/94 94.12 4/29/86 91.41* 8/3/94 94.31 Three year gap 9/6/94 94.24 3/26/89 94.86 10/10/94 94.27 5/4/89 93.70 11/17/94 94.51 6/2/89 93.97 1/13/95 94.93 6/26/89 94.07 2/22/95 94.81 7/13/89 94.14 3/31/95 93.99 9/11/89 94.45 5/10/95 93.89 41) 10/27/89 94.79 6/15/95 93.57 1/1/90 95.16 7/12/95 93.39 1/31/90 95.21 8/18/95 93.31 4/14/90 95.72 9/21/95 93.05 6/5/90 95.77 11/2/95 93.06 9/20/90 96.42 12/15/95 93.23 10/17/90 96.63 1/22/95 93.47 11/9/90 96.74 2/16/96 93.61 5/15/91 97.14 3/29/96 93.49 6/11/91 97.24 6/24/96 93.25 7/3/91 97.29 7/16/96 93.39 9/16/91 97.68 8/26/96 93.53 11/4/91 98.04 9/24/96 93.72 1/1/92 98.47 10/18/96 93.78 * Highest water level recorded ** Lowest water level recorded 4111 TANGERINE WELL (Portuguese Bend landslide) . Location: 40 feet southwest of Tangerine Road and 350 feet southeast of Peppertree Drive. Map coordinates: N4,019,100; E4,177,290. Ground elevation: 292 feet (1996) WELL PRODUCTION IN GALLONS Meter Pro- Gallons Meter Pro- Gallons Date Dai readingduction per dad Date Days reading��� duction per day 8726787 - - 375;6 - - 17211797 31 T'97;560 -9f0 -294 9/7/87 12 389,900 14,220 1,185 2/22/97 33 707,380 9,820 298 9/12/88 water level 112 ft. below top 3/26/89 572 681,122 291,222 509 4/7/89 12 698,590 17,468 1,456 5/4/89 27 712,460 13,870 514 6/2/89 29 732,250 19,790 682 6/30/89 28 748,600 16,350 584 7/13/89 13 757,590 8,990 692 9/11/89 60 780,672 23,082 385 10/27/89 46 808,593 27,921 607 1/1/90 66 817,750 9,157 139 1/31/90 30 857,900 40,150 1,338 4/14/90 73 858,290 390 5 6/5/90 52 858,294 4 0 9/20/90 107 858,294 0 0 10/17/90 27 858,294 0 0 11/9/90 23 858,294 0 0 5/15/91 188 45,810 - - 6/11/91 27 46,080 270 10 7/3/91 22 70,680 24,600 1,118 9/16/91 75 112,620 41,940 559 11/4/91 49 117,330 4,710 96 1/1/92 48 131,980 14,650 305 2/8/92 38 135,060 3,080 81 3/18/92 39 135,060- 0 0 8/15/92 150 178,170 43,110 287 . 9/23/92 39 210,380 32,210 826 1/1/93 100 260,900 50,620 505 2/3/93 33 272,420 11,520 349 4/5/93 61 286,840 14,420 236 5/11/93 36 293,980 7,140 198 6/11/93 31 293,980 0 0 7/26/93 45 323,980 30,000 667 9/14/93 50 348,190 24,210 484 11/23/93 70 373,790 25,600 366 1/11/94 48 389,530 15,740 328 3/7/94 55 407,480 17,950 654 4/12/94 36 419,100 11,720 326 6/16/94 65 438,180 19,080 294 8/3/94 48 450,430 12,250 255 9/6/94 34 458,640 8,210 241 10/10/94 34 467,810 9,170 270 11/17/94 38 476,210 8,400 221 1/13/95 57 476,210 0 0 2/22/95 40 476,210 0 0 3/31/95 37 476,210 0 0 5/10/95 41 500,560 24,350 594 6/15/95 36 517,680 17,120 476 7/12/95 27. 527,700 10,020 455 8/18/95 37 540,310 12,610 341 9/21/95 34 552,030 11,720 345 11/2/95 42 566,240 14,210 410 12/15/95 43 573,380 7,140 166 1/22/96 38 580,670 7,290 192 2/16/96 25 592,690 12,020 481 3/29/96 42 596,200 3,510 84 6/24/96 87 622,250 26,050 299 7/16/96 22 633,410 11,160 507 8/26/96 41 645,380 11,970 292 4111 9/24/96 29 658,050 12,670 437 10/18/96 24 666,630 8,580 357 11/19/96 32 681,760 15,130 473 12/20/96 31 688,460 6,700 216 FISCHER WELL (Portuguese Bend landslide) II) Location: At northeast end of truncated Cherryhill Loop. `, ------ Map coordinates: N4,018,260; E4,177,430. Ground elevation: 167 feet (1996) Well completed on 5/7/87; total depth 117 feet; bentonite from 107 to 117; casing blank 0-75 feet; perforated 75 to 105; blank 105 to 117 feet. WELL PRODUCTION IN GALLONS Meter Pro- Gallons Meter Pro- Gallons Date Dus reading duction Per day. us Date Dreading duction Per day. 8727787 - _ 3Zi51 ---- - --- - ---- 3/9/88 water level 54.37 feet. 3/26/89 211 277,040 240,530 1,140 4/7/89 12 283,380 6,340 528 5/4/89 27 290,810 7,430 275 6/2/89 29 305,065 14,255 492 6/26/89 24 314,594 9,529 397 9/11/89 77 351,260 36,666 476 4/19/90 220 410,440 59,180 269 11/9/90 204 482,610 72,170 354 12/19/90 40 496,030 13,420 336 5/15/91 147 510,580 14,550 99 9/16/91 124 538,390 27,810 224 11/4/91 49 558,780 20,390 416 2/8/92 96 602,010 43,230 450 3/18/92 39 605,280 3,270 84 8/15/92 150 643,070 37,790 252 9/23/92 39 665,010 21,940 563 1/1/93 100 713,450 48,440 484 2/3/93 33 727,960 14,510 440 4/5/93 61 755,600 27,640 453 5/11/93 36 770,300 14,700 408 6/11/93 31 778,020 7,720 249 7/26/93 45 782,210 4,190 93 Eh 9/14/93 50 807,270 25,060 501 11/23/93 70 835,820 28,550 408 1/11/94 49 848,660 12,840 262 3/7/94 55 851,370 2,710 49 4/12/94 36 857,100 5,730 159 6/16/94 65 894,530 37,430 576 8/3/94 48 918,100 23,570 491 9/6/94 34 933,900 15,800 465 10/10/94 34 935,720 1,820 54 11/15/94 35 935,730 10 0 1/13/95 59 965,230 29,500 500 2/20/95 38 987,420 22,190 584 3/31/95 39 1,000,500 13,080 335 5/10/95 40 1,005,390 4,890 122 6/15/95 36 1,028,320 22,930 637 7/12/95 27 1,044,650 16,330 605 8/18/95 37 1,067,410 22,760 615 9/21/95 34 1,086,880 19,470 573 11/2/95 42 1,111,090 24,210 576 12/15/95 43 1,135,540 24,450 569 1/22/96 38 1,151,440 15,900 418 2/16/96 25 1,164,100 12,660 506 3/29/96 42 1,188,480 24,380 580 6/24/96 87 1,235,360 46,880 539 7/16/96 22 1,246,740 11,380 517 8/26/96 41 1,268,570 21,830 532 9/24/96 29 1,283,430 14,860 512 10/18/96 24 1,294,830 11,400 475 11/19/96 32 1,311,160 16,330 510 12/20/96 31 1,324,300 13,140 424 1/20/97 31 1,332,470 8,170 264 2/22/97 33 1,332,470 0 0 • Station K movement monitoring measurements. Location: northeast corner of east-central subslide. Coordinates: N4,018,700 and E4,179,120 (north end). • Measurement Displace- No. Displ. rate Measurement Displace- No. Displ. rate Date feet & inches ment days in - days--- s:v-- :r' - -r7 10/5/90 50' 1.2" 0.2" 2 0.100 12/15/95 64' 0.6" 4.0" 43 0.093 10/12/90 50' 1.7" 0.5" 7 0.071 1/22/96 64' 4.2" 3.6" 38 0.095 10/17/90 50' 2.0" 0.3" 5 0.060 2/16/96 64' 7.8" 3.6" 25 0.144 10/26/90 50' 2.6" 0.6" 9 0.067 3/29/96 65' 0.2" 4.4" 42 0.105 11/2/90 50' 2.9" 0.3" 7 0.043 5/3/96 65' 4.0" 3.8" 34 0.112 11/9/90 50' 3.3" 0.4" 7 0.057 5/28/96 65' 6.3" 2.3" 25 0.092 11/13/90 50' 3.5" 0.2" 4 0.050 6/24/96 65' 8.9" 2.6" 27 0.096 11/27/90 50' 4.2" 0.7" 14 0.050 7/16/96 65'10.9" 2.0" 22 0.091 12/19/90 50' 5.2" 1.0" 22 0.045 8/2/96 66' 0.3" 1.4" 17 0.082 2/22/90 50' 8.1" 2.9" 65 0.045 8/26/96 66' 2.1" 1.8" 24 0.075 3/9/91 50' 8.9" 0.8" 15 0.053 9/24/96 66' 4.5" 2.4" 29 0.083 4/25/91 51' 0.1" 3.2" 45 0.071 10/18/96 66' 6.2" 1.7" 24 0.071 5/14/91 51' 1.0" 0.9" 19 0.047 11/19/96 66' 9.0" 2.8" 32 0.087 6/11/91 51' 2.4" 1.4" 28 0.050 12/20/96 67' 0.8" 3.8" 31 0.123 7/3/91 51' 3.4" 1.0" 22 0.045 1/20/97 67' 5.7" 4.9" 31 0.158 8/2/91 51' 4.8" 1.4" 30 0.047 2/22/97 68' 1.4" 7.7" 33 0.233 9/16/91 51' 6.6" 1.8" 45 0.040 10/5/91 51' 7.6" 1.0" 19 0.053 11/4/91 51' 8.7" 1.1" 30 0.037 1/1/92 51'10.9" 2.2" 58 0.038 2/8/92 52' 0.6" 1.7" 38 0.045 2/21/92 52' 1.6" 1.0" 13 0.077 3/24/92 52' 4.2" 2.6" 32 0.081 4/4/92 52' 5.6" 1.4" 11 0.127 4/17/92 52' 6.8" 1.2" 13 0.092 5/1/92 52' 8.1" 1.3" 14 0.093 5/15/92 52' 9.1" 1.0" 14 0.071 5/22/92 52' 9.6" 0.5" 7 0.071 6/12/92 52'11.1" 1.5" 21 0.071 4111 7/22/92 53' 1.5" 2.4" 40 0.060 8/10/92 53' 2.4" 0.9" 19 0.047 9/1/92 53' 3.6" 1.2" 22 0.055 9/19/92 53' 4.3" 0.7" 18 0.039 10/10/92 53' 5.4" 1.1" 22 0.050 11/18/92 53' 7.4" 2.0" 39 0.051 1/1/93 53' 9.6" 2.2" 44 0.050 1/25/93 53'11.9" 2.3" 24 0.096 2/3/93 54' 0.9" 1.0" 9 0.111 3/12/93 54' 6.3" 5.4" 37 0.146 4/5/93 54' 9.5" 3.2" 24 0.133 5/11/93 55' 1.2" 3.7" 36 0.103 6/11/93 55' 4.1" 2.9" 31 0.094 7/26/93 55' 7.9" 3.0" 45 0.084 9/14/93 56' 0.4" 4.5" 50 0.090 10/8/93 56' 3.2" 2.8" 24 0.117 11/23/93 56' 7.0" 3.8" 46 0.083 1/11/94 56'11.0" 4.0" 49 0.082 2/24/94 57' 0.8" 1.8" 13 0.138 3/7/94 57' 1.9" 1.1" 11 0.100 4/12/94 57' 4.8" 2.9" 36 0.081 6/16/94 57'10.1" 5.3" 65 0.082 8/3/94 58' 2.1" 4.0" 48 0.083 9/6/94 58' 5.6" 3.5" 34 0.103 10/10/94 58' 8.7" 3.1" 34 0.091 11/22/94 59' 0.1" 3.4" 43 0.079 12/20/94 59' 2.2" 2.1" 28 0.075 1/13/95 59' 5.1" 2.9" 24 0.121 1/20/95 59' 6.6" 1.5" 7 0.214 _ 2/3/95 59'10.4" 3.8" 14 0.271 2/22/95 60' 2.8" 4.4" 19 0.232 3/18/95 60' 8.8" 6.0" 24 0.250 3/28/95 60'11.9" 3.1" 10 0.310 * 5/10/95 61' 9.3" 9.4" 43 0.219 6/15/95 62' 3.6" 6.3" 36 0.180 7/12/95 62' 7.6" 4.0" 27 0.148 8/18/95 63' 0.5" 4.9" 37 0.132 Three sump wells production continued. West Sump Central Sump East Sump Peri od - e r t:ro- Gal/ -FTe r tyro- Gal/ -fifer-fro Gal/ Date days reading duction da readin duction da reading duction da 172279�i 38 -41-,"450 --z2 3b� - TIi-4�-73791T T9U 3b3 gr,-654-Cr ---16 2/16/96 25 48,350 6,900 276 120,170 8,760 350 34,654cf 0 0 3/29/96 42 63,090 14,740 351 135,110 14,940 356 34,654cf 0 0 4/19/96 21 71,730 8,640 411 142,520 7,410 353 off 0 0 5/3/96 14 77,450 9,770 698 147,130 4,590 328 off 0 0 5/28/96 25 87,220 10,320 413 156,000 8,870 355 180,670 - - 6/24/96 27 97,540 10,320 382 165,090 9,090 337 187,710 7,040 261 7/16/96 22 105,360 7,820 355 172,300 7,210 328 193,170 5,460 248 8/2/96 17 110,610 5,250 309 177,720 5,420 319 197,128 3,958 233 8/26/96 24 117,180 6,570 274 180,910 3,190 133 199,080 1,952 81 9/24/96 29 120,310 3,130 108 180,910 0 0 199,080 0 0 10/18/96 21 122,410 2,100 100 182,790 1,880 90 200,360 1,280 61 11/19/96 32 126,680 4,270 133 185,080 2,290 72 203,110 2,750 86 12/20/96 31 138,350 11,670 376 185,080 0 0 209,910 6,800 219 1/20/97 31 151,580 13,230 427 185,080 0 0 217,340 7,430 240 2/22/97 33 167,050 15,470 469 189,320 4,240 128 222,690 5,350 162 I 0 i • • A-3. Boring Logs of 1988 • DRILL HOLE LOGS FOR FALL 1988 DRILLING PROJECT PORTUGUESE BEND LANDSLIDE Drill Hole Number: B88-1 Date Drilled: 10/11/88 Type: 24" bucket auger Drilled by Datum; logged by P. Ehlig. Location: N4,018,902; E4,178,642 (221' N38W of J13A). Elevations: ground = 189.5' ; slide base = 164' ; water table = 163'. Hole cased with 2" PVC on 11/9/88. DEPTH LITHOLOGIC LOG 0-25.5' Landslide debris: Silty to clayey rock fragments, generally less than 5 cm long in a densely compacted, silty clay matrix; yellow to orange brown; moist below first several feet but not saturated. 25.5' Landslide basal slip surface bounded by a few cm of sheared bentonite; parallel to bedding in underlying bedrock. 25.5-31' In place bedrock of Altamira Shale Member of Monterey Formation: Blue gray clastic siltstone and fine-grained sandstone containing glaucophane schist fragments thinly interbedded with dark chocolate brown organic shale and mudstone containing fish scales and light brown phosphatic nodules; thin gypsum veins parallel to bedding; very firm; slow drilling; bedding continuous around hole N8OW 16S. Water seeped into bottom of hole after drilling completed. Drill Hole Number: B88-2 Date Drilled: 10/11/88 Type: 24" bucket auger Drilled by Datum, logged by P. Ehlig. Location: N4,018,621; E4,178,295. Elevations: ground = 172.5' ; slide base under 103' ; water table above 138'. Hole caved to a depth of about 25 feet by 11/10/88. Back filled and abandoned. • DEPTH LITHOLOGIC LOG 0-69' Landslide debris: Mostly silty to clayey rock fragments, generally less than 5 cm long in a densely compacted, silty clay matrix; yellow to orange brown; extensive cream-colored bentonite above about 30' ; ground water seepage at about 45 feet; stopped drilling at 69' because drilling very slow due to firm compaction and cohesive nature of clayey slide debris. Drill Hole Number: B88-3 Date Drilled: 10/11/88 Type: 24" bucket auger Drilled by Datum; logged by P. Ehlig. Location: N4,019,800; E4,178,297. Elevations: ground = 300' ; slide base = 243' ; water table about 265' . Hole caved to a depth of about 25 feet by 11/11/88. Back filled and abandoned. DEPTH LITHOLOGIC LOG 0-16' Compacted fill and adobe topsoil; dry at top becoming slightly moist 1111 near base. 16-57' Landslide debris: 16-33': Cream-colored bentonite derived from Portuguese Tuff. Al • Drill hole logs for fall 1988 drilling project in Portuguese Bend landslide, page 2. 111, (Log of drill hole B88-3 continued) 33-ca. 45' : Fine-grained silty sand; orange brown; friable; caving due to ground water seepage at 36' . ca. 45-57': Silty sand mixed with clayey rock fragments in silty clay matrix; yellow to orange brown; tiny gypsum veins around rock fragments and a few stout gypsum crystals as much as 1 cm long. 57' Slip surface at base of landslide; bentonite at slip surface but not observed in hole due to caving from ground water seepage at 36' . 57-57.5' In place bedrock of Altamira Shale Member of Monterey Formation: Blue gray sandy siltstone containing glaucophane schist fragments thinly interbedded with chocolate brown organic rich shale containing fish scales; hard drilling. Drill Hole Number: B88-4 Date Drilled: 10/12/88 Type: 24" bucket auger Drilled by Datum; logged by P. Ehlig. Location: N4,020,278; E4,177,677 (158' N74W of surveying monument J-16). Elevations: ground = 350' ; slide base = 281' ; water table = 327'. Hole caved to depth of 26 feet, 2" PVC installed to depth of about 31'. DEPTH LITHOLOGIC LOG 0-5' Recent fill and topsoil; contains wood and plant debris. 5-67' Landslide debris: Mostly silty to clayey rock fragments but some hard chert and dolostone blocks, generally less than 20 cm long in a loosely compacted, silty clay matrix; yellow to orange brown; seepage at 27 • feet. 67-69' Soft fine-grained sandstone and siltstone; mottled yellow-brown to gray; thin seam of slickensided bentonite present in cuttings (unable to down hole log this zone due to ground water). 68-69' Landslide basal slip surface. 69-70' In place bedrock of Altamira Shale Member of Monterey Formation: Blue gray clastic siltstone and fine-grained sandstone thinly interbedded (0.2 to 5 cm) with dark chocolate brown organic shale and mudstone containing fish scales; hard; difficult to drill. Drill Hole Number: B88-5 Date Drilled: 10/12/88 Type: 24" bucket auger Drilled by Datum; logged by P. Ehlig. Location: N4,019,778; E4,178,529 (43' N85E of surveying monument D-2). Elevations: ground = 299' ; slide base = 257"; water table = 260'. Hole cased with 6" PVC on 11/9/88. DEPTH LITHOLOGIC LOG 0-13' Rock rubble with soft soil matrix; dry. 13-41.6' Landslide debris: 13-13.5' waxy, yellowish white bentonite. 13.5-28.5' fine-grained silty sandstone; friable; yellow-brown with_ scattered grains of blue glaucophane schist; moist. 28.5-29' soft siltstone and claystone; mottled yellow-brown to bluish gray. • 29-41' fine-grained silty sandstone; friable; yellow brown; very moist. 41-41.6' sheared waxy bentonite; gray white; very moist; plastic. 41.5 ' Slip surface at base of landslide. A2 Drill hole logs for fall 1988 drilling project in Portuguese Bend landslide, page 3. • (Log of drill hole B88-5 continued) 41.5-49' In place bedrock of Altamira Shale Member of Monterey Formation: Interbedded siltstone, shale and fine-grained sandstone; fractured and easy to drill at top becoming firm and tight at bottom of hole; upper part mottled orange-brown along fractures becoming blue-gray to dark gray in interior of fractured blocks; thin seams of gypsum along fractures; ground water flowing along fractures from base of slide to bottom of hole; bottom of hole filling with water at a rate of a few gallons per minute. Drill Hole Number: B88-6 Date Drilled: 10/12/88 Type: 24" bucket auger Drilled by Datum; logged by P. Ehlig. Location: N4,019,273; E4,178,088 (156' N12E of surveying monument J-9A). Elevations: ground = 289' ; slide base under 227' ; water table 243'. Hole caved to depth of about 46' . Cased with 2" PVC to ca. 51". DEPTH LITHOLOGIC LOG 0-62' Landslide debris: 0 to about 45' Mostly white to cream-colored bentonite from displaced Portuguese Tuff; dry at top becoming moist at depth. 45-62' Mainly yellow-brown, fine-grained silty sandstone; friable; a few rounded granules and pebbles of hard quartzose rocks derived in part from Catalina Schist; some clayey debris near bottom of hole; strong seepage and some caving below 60 feet. • Drill Hole Number: B88-7 Date Drilled: 11/10/88 Type: 24" bucket auger Drilled by King; logged by P. Ehlig. Location: N4,020,212; E4,177,611. Elevations: ground = 354' ; slide base under 264' ; water table above 304'. Backfilled and abandoned on 11/10/88. DEPTH LITHOLOGIC LOG 0-87' Landslide debris; angular shale fragments up to a few inches long in a clayey matrix; much appears to be bedded and of alluvial origin but all has low permeability; yellow to orange brown; minor seepage at about 50 feet but not sufficient for intended use as a dewatering well. Drill Hole Number: B88-8 Date Drilled: 11/10/88 Type: 24" bucket auger Drilled by King; logged by P. Ehlig. Location: N4,019,726; E4,178,646 (168' S69.5E of surveying monument D-2). Elevations: ground = 294' ; slide base = 240' ; water table = 254' . Hole cased with 2" PVC perforated in lower 20 feet. DEPTH LITHOLOGIC LOG 0-3' Fill with garbage in it. 3-42' Landslide debris: Silty to clayey rock fragments, generally less than 10 cm long in a densely compacted, silty clay matrix; some bentonite rich zones; yellow to orange brown; moist below first several feet but • not saturated. 42-53' Landslide debris: mixture of silt and very fine grained sand; some silty A3 Drill hole logs for fall 1988 drilling project in Portuguese Bend landslide, page 4. 1111 (Log of drill hole B88-8 continued) sandstone fragments; orange brown; saturated. 53-53.5' Intensely sheared bentonite; waxy and plastic; cream to greenish gray. 53.5' Base of landslide. 53.5-63.7' In place bedrock of Altamira Shale; interbedded sitstone and shale; firm; black to blue gray; very tight. Drill Hole Number: B88-9 Date Drilled: 11/10/88 Type: 24" bucket auger Drilled by King, logged by P. Ehlig. Location: N4,019,786; E4,178,307. Elevations: ground = 302' ; slide base 233' ; water table 264' . Cased with 6" PVC for possible use as dewatering well. DEPTH LITHOLOGIC LOG 0-69' Landslide debris: 0-14' : siliceous shale fragments in a clayey silt matrix; yellow brown; dry. 14-38': cream-colored bentonite (displaced Portuguese Tuff); moist. 38-69': fine-grained silty sand; yellow brown; contains scattered rock fragments; easy drilling; caving. 69' Sheared bentonite at base of slide. Drill Hole Number: B88-10 Date Drilled: 11/28/88 Type: 24" bucket auger • Drilled by Datum, logged by P. Ehlig. Location: N4,018,557; E4,178,238. Elevations: ground = 171' ; slide base under 95' ; water table = 153' . Hole case with 2" PVC. DEPTH LITHOLOGIC LOG 0-76' Landslide debris: 0-50' : orange brown breccia consisting of siliceous shale and some dolostone fragments in a silty clay matrix. 50-52': cream-colored bentonite. 52-74': breccia as above 50'. 74-76': fine-grained silty sand; yellow brown. Hole terminated at 76' due to broken kelly. Drill Hole Number: B88-11 Date Drilled: 11/30/88 Type: 24" bucket auger Drilled by Datum, logged by P. Ehlig. Location: N4,017,415; E4,176,722. Elevations: ground = 67'; slide base below sea level; water table 21' . Hole cased with 2" PVC. Detailed lithologic log missing; log similar to B88-13 which is 18 feet to east. _ Total depth about 70 feet; entirely in landslide material; strong groundwater flow encountered in rocky zone between about 55 and 60 feet. • A4 Drill hole logs for 1988 drilling project in Portuguese Bend landslide, page 5. 1111 Drill Hole Number: B88-12 Date Drilled: 12/6/88 Type: 24" bucket auger Drilled by Datum, logged by P. Ehlig. Location: N4,017,377; E4,178,429. Elevations: ground = 119' ; slide base =24' ; water table uncertain because of probable drainage through bottom of well; waterlevelat a depth of 85.6' on 12/7/88; water audibly dripping in hole, gets tape wet at a depth of about 40' on 2/11/89. Hole cased with 2" PVC to 102.5' but casing closed by sliding at 94'. DEPTH LITHOLOGIC LOG 0-95' Landslide materials: 0-80' : bedded silty, clayey, sandy and fine-grained gravelly strata of alluvial and lacustrine origin; brown, yellow brown and orange brown; easy drilling; moist. 80-95': gray to yellowish white fine-grained silty sand. 95' Base of slide; sheared bentonite. 95-102.5' Blue gray siltstone, in part sandy, with thin interbeds of chocolate brown shale; very firm; slow drilling. Drill Hole Number: B88-13 Date Drilled: 12/7/88 Type: 24" bucket auger Drilled by Datum; logged by P. Ehlig. Location: N4,017,418; E4,176,740. Location: N4,017,557; E4,178,238 Elevations: ground = 171' ; possible slide base 87' ; water table = 153'. -. Hole case with 6" PVC for use as dewatering well. DEPTH LITHOLOGIC LOG 0-84' Landslide debris: 0-ca.70' : yellow brown to orange brown oxidized silty clay containing shale fragments; tighly compacted; hard dolostone block at 38'. 70-84': siltstone mottled yellow brown to blue gray. 84' Possible base of landslide. 84-90' Blue gray bentonite; appears to be unsheared; gritty. 90-93' Dark brown siltstone interbedded with blue gray bentonitic sandstone containing black volcanic granules. A5 • • A-4. Station K Movement Records 10/3/90 to 10/18/90 • Station K movement monitoring measurements. Ask Location: northeast corner of east-central subslide. Coordinates: N4,018,700 and E4,179,120 (north end). Measurement Displace- No. Displ. rate Measurement Displace- No. Displ. rate Date feet & inches men- da -n./day Date -eet & inches ment days in./day 11756 - 3 n - - _ 0 -- rrT2775 --631-8761r- -- E-T" -7 -071-07 10/5/90 50' 1.2" 0.2" 2 0.100 12/15/95 64' 0.6" 4.0" 43 0.093 10/12/90 50' 1.7" 0.5" 7 0.071 1/22/96 64' 4.2" 3.6" 38 0.095 10/17/90 50' 2.0" 0.3" 5 0.060 2/16/96 64' 7.8" 3.6" 25 0.144 10/26/90 50' 2.6" 0.6" 9 0.067 3/29/96 65' 0.2" 4.4" 42 0.105 11/2/90 50' 2.9" 0.3" 7 0.043 5/3/96 65' 4.0" 3.8" 34 0.112 11/9/90 50' 3.3" 0.4" 7 0.057 5/28/96 65' 6.3" 2.3" 25 0.092 11/13/90 50' 3.5" 0.2" 4 0.050 6/24/96 65' 8.9" 2.6" 27 0.096 11/27/90 50' 4.2" 0.7" 14 0.050 7/16/96 65'10.9" 2.0" 22 0.091 12/19/90 50' 5.2" 1.0" 22 0.045 8/2/96 66' 0.3" 1.4" 17 0.082 2/22/90 50' 8.1" 2.9" 65 0.045 8/26/96 66' 2.1" 1.8" 24 0.075 3/9/91 50' 8.9" 0.8" 15 0.053 9/24/96 66' 4.5" 2.4" 29 0.083 4/25/91 51' 0.1" 3.2" 45 0.071 10/18/96 66' 6.2" 1.7" 24 0.071 5/14/91 51' 1.0" 0.9" 19 0.047 6/11/91 51' 2.4" 1.4" 28 0.050 7/3/91 51' 3.4" 1.0" 22 0.045 8/2/91 51' 4.8" 1.4" 30 0.047 9/16/91 51' 6.6" 1.8" 45 0.040 10/5/91 51' 7.6" 1.0" 19 0.053 11/4/91 51' 8.7" 1.1" 30 0.037 1/1/92 51'10.9" 2.2" 58 0.038 2/8/92 52' 0.6" 1.7" 38 0.045 2/21/92 52' 1.6" 1.0" 13 0.077 3/24/92 52' 4.2" 2.6" 32 0.081 4/4/92 52' 5.6" 1.4" 11 0.127 4/17/92 52' 6.8" 1.2" 13 0.092 5/1/92 52' 8.1" 1.3" 14 0.093 5/15/92 52' 9.1" 1.0" 14 0.071 5/22/92 52' 9.6" 0.5" 7 0.071 6/12/92 52'11.1" 1.5" 21 0.071 • 7/22/92 53' 1.5" 2.4" 40 0.060 8/10/92 53' 2.4" 0.9" 19 0.047 9/1/92 53' 3.6" 1.2" 22 0.055 9/19/92 53' 4.3" 0.7" 18 0.039 10/10/92 53' 5.4" 1.1" 22 0.050 11/18/92 53' 7.4" 2.0" 39 0.051 1/1/93 53' 9.6" 2.2" 44 0.050 1/25/93 53'11.9" 2.3" 24 0.096 2/3/93 54' 0.9" 1.0" 9 0.111 3/12/93 54' 6.3" 5.4" 37 0.146 4/5/93 54' 9.5" 3.2" 24 0.133 5/11/93 55' 1.2" 3.7" 36 0.103 6/11/93 55' 4.1" 2.9" 31 0.094 7/26/93 55' 7.9" 3.0" 45 0.084 9/14/93 56' 0.4" 4.5" 50 0.090 10/8/93 56' 3.2" 2.8" 24 0.117 11/23/93 56' 7.0" 3.8" 46 0.083 1/11/94 56'11.0" 4.0" 49 0.082 2/24/94 57' 0.8" 1.8" 13 0.138 3/7/94 57' 1.9" 1.1" 11 0.100 4/12/94 57' 4.8" 2.9" 36 0.081 6/16/94 57'10.1" 5.3" 65 0.082 8/3/94 58' 2.1" 4.0" 48 0.083 9/6/94 58' 5.6" 3.5" 34 0.103 10/10/94 58' 8.7" 3.1" 34 0.091 11/22/94 59' 0.1" 3.4" 43 0.079 12/20/94 59' 2.2" 2.1" 28 0.075 1/13/95 59' 5.1" 2.9" 24 0.121 1/20/95 59' 6.6" 1.5" 7 0.214 2/3/95 59'10.4" 3.8" 14 0.271 2/22/95 60' 2.8" 4.4" 19 0.232 3/18/95 60' 8.8" 6.0" 24 0.250 3/28/95 60'11.9" 3.1" 10 0.310 . 5/10/95 61' 9.3" 9.4" 43 0.219 6/15/95 62' 3.6" 6.3" 36 0.180 7/12/95 62' 7.6" 4.0" 27 0.148 8/18/95 63' 0.5" 4.9" 37 0.132