ARCHIVED REPORTS_XR0008102 CASE 1

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TABLE 16MMARY OF RESULTS OF GROUNDWATER MONITORING • WELL DATE OF CASING DEPTH TO PRODUCT GROUNDWATER TPH-G B T E X MTBE DO LAB ID SAMPLING/ ELEVATION (a) WATER THICKNESS ELEVATION (6) (ugIA) (ug/L) (ug1L) (ug/L) (ug/L) OWL) (ppm) MONITORING (Feet) (Feet) (Feet) (Feet) AMW-4 08/10/90 2536 483 — 2053 ND<50 06 07 29 42 -- — SUP AMW-4 08/27/90 2536 483 --- 2053 — — --- --- --- -- — -- AMW-4 11/02/90 2536 489 --- 2047 -- — — — -- --- -- — AMW-4 11/05/90 2536 488 -- 2048 ND<50 03 ND<0 3 ND<0 3 ND<O 3 --- SUP AMW-4 02/25/91 2536 408 — 2128 ND<50 ND<0 3 ND<0 3 ND<0 3 ND<O 3 — — SUP AMW-4 06/27/91 2536 501 --- 2035 ND<50 ND<0 5 ND<O 5 ND<0 5 ND<0 5 --- -- CHR AMW-4 09/25/91 2536 545 — 1991 ND<30 ND<O 30 ND<O 30 ND<0 30 ND<0 30 --- — SEQ AMW-4 12/10/91 2536 479 — 2057 ND<30 ND<O 30 ND<O 30 ND<0 30 ND<O 30 — — SEQ AMW-4 03/25/91 2536 426 --- 2110 ND<30 ND<O 30 ND<O 30 ND<0 30 ND<O 30 --- --- SEQ AMW-4 06/25/92 2536 616 --- 1920 ND<30 ND<O 30 ND<O 30 ND<0 30 ND<O 30 — --- SEQ AMW-4 12/08/92 2536 474 --- 2062 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<O 5 — --- ANA AMW-4 03/10/93 2536 428 — 21 08 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 — {I) — PACE AMW-4 06/16/93 2536 406 --- 2130 ND<50 ND<0 5 ND<0 5 ND<O 5 ND<0 5 --- (1) — PACE AMW-4 10/22/93 2536 485 — 2051 ND<50 ND<0 5 ND<O 5 ND<O 5 ND<O 5 ND<5 0 (1) --- PACE AMW-4 01/24/94 2536 481 --- 2055 ND<50 ND<0 5 ND<0 5 ND<O 5 ND<O 5 ND<5 0 (1) — PACE AMW-4 06/07/94 2536 530 --- 2006 N0<50 ND<0 5 ND<0 5 ND<O 5 ND<O 5 ND<5 0 (1) 34 PACE AMW-4 09/13/94 2536 559 --- 1977 ND<50 ND<O 5 ND<0 5 ND<O 5 ND<O 5 ND<5 0 (I) 69 PACE AMW-4 01/10/95 2536 422 — 2114 ND<50 ND<0 5 ND<0 5 ND<O 5 ND<1 --- 71 ATI AMW-4 03/23/95 2536 398 — 2138 ND<50 ND<0 50 ND<O 50 ND<0 50 ND<1 0 --- 79 ATI AMW-4 10/04/95 2536 532 — 2004 ND<50 ND<0 50 ND<O 50 ND<0 50 ND<1 0 ND<5 0 59 ATI AMW-4 01/04/96 2536 448 -- 2088 ND<50 ND<0 50 ND<0 50 ND<0 50 ND<1 0 ND<5 0 10 ATI AMW-4 03/29/96 2536 432 --- 2104 N0<50 ND<0 5 ND<1 ND<1 ND<1 ND<10 37 SPL AMW-4 07/01/96 2536 488 --- 2048 ND<50 ND<0 5 ND<1 ND<1 ND<1 ND<10 61 SPL AMW-4 10/15/96 2536 509 — 2027 ND<50 ND<O 5 ND<1 0 ND<1 0 ND<1 0 ND<10 75 SPL AMW-4 04116/97 2536 367 --- 2169 --- --- -- — — — — — AMW-4 10/15/97 2536 512 — 2024 — — — — — --- — — AMW-4 03/17/98 2536 471 --- 2065 --- --- --- — — — --- — AMW-4 01/06/99 2536 483 --- 2053 --- --- — --- --- — — — AMW-4 09/13/99 2536 513 — 2023 — — --- — — — --- --- AMW-4 01/19/00 2536 455 — 2081 — — — — — --- — --- AMW-4 04/12/00 2536 440 — 2096 — — — — — — — --- AMW-4 07/22/00 2536 507 — 2029 — — — — — — — --- AMWA 10/26/00 2536 468 --- 2068 --- --- --- -- --- --- — --- AMW-4 01/17/01 2536 522 — 2014 -- — — — — — — — AMW-4 04/12/01 2536 476 — 2060 --- --- --- --- --- — — — AMW-4 05/23/01 2536 485 — 2051 ND<50 ND<O 5 147 ND<O 5 ND<1 5 ND<O 5 --- PACE AMW-4 07/31/01 2536 511 --- 2025 ND<50 ND<O 5 ND<O 5 ND<0 5 ND<1 5 ND<0 5 — PACE AMW-4 10/30/01 2536 498 — 2038 ND<50 ND<O 5 ND<O 5 ND<O 5 ND<1 5 818 -- PACE AMW-4 01/29/02 2536 441 --- 2095 ND<50 ND<O 5 ND<O 5 ND<0 5 ND<1 0 ND<O 5 — PACE Blaine Tech Services Inc,Report,020129-KF-1,BP Oil 11194 at 2375 Tracy Blvd,Tracy,Califomia Page 20