ARCHIVED REPORTS_XR0008111 CASE 1

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• • • TABLE 1 -SUMMARY 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 (b) (ug/11) (ugll) (ug/1) (ug/1) (ugll) (ug1l) (ppm) MONITORING (Feet) (Feet) (Feet) (Feet) MW-2 11/20/87 -- --- – -- ND<50 Nil<0 5 ND<0 5 --- ND<0 5 – – – MW-2 03/13/88 2633 567 -- 2066 – -- – - - - MW-2 03/23/88 2633 563 --- 2070 ND<50 ND<0 5 ND<0 5 --- ND<0 5 -- --- --- MW-2 06/07/88 2633 570 -- 2063 --- MW-2 -MW-2 10/18188 2633 570 --- 2063 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 - – MW-2 07115/90 2633 535 2098 50 43 08 07 16 MW-2 04126190 2633 550 --- 2083 --- -- --- --- --- --- --- --- MW-2 07/12/90 2633 548 --- 2085 60 04 13 05 15 --- --- SUP MW-2 08127190 2633 580 -- 2053 --- --- -- --- --- – -- MW-2 11/02/90 2633 585 – 2048 – - – - --- --- MW-2 11105/90 2633 587 --- 2046 ND<50 ND<0 3 ND<0 3 ND<0 3 ND<0 3 -- --- SUP MW-2 02/25/91 213533 534 --- 2099 ND<50 ND<0 3 ND<0 3 ND<0 3 ND<0 3 --- --- SUP MW-2 06/27191 2633 607 --- 2026 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 CHR MW-2 09/25/91 2633 636 --- 1997 ND<0 30 ND<0 30 ND<0 30 ND<0 30 ND<0 30 SEQ MW-2 12/10/91 2633 586 --- 2047 ND<0 30 ND<0 30 ND<0 30 ND<0 30 ND<0 30 --- --- SEQ MW-2 03/25/92 2633 542 - 2091 240 42 is 080 38 --- --- SEQ MW-2 06125/92 2633 733 – 19100 ND<30 ND<0 30 ND<0 30 ND<0 30 ND<0 30 --- - SEQ MW-2 12/08192 2633 591 -- 2042 611 ND<0 5 ND<0 5 ND<0 5 ND<0 5 -- ANA MW-2 03110/93 2633 569 – 2064 220 35 06 57 92 - -- PACE MW-2 06/16/93 2633 353 -- 2280 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 --- --- PACE MW-2 10122/93 2633 606 -- 2027 460 10 06 14 08 1570 (c) --- PACE QC-1 (d) 10122193 460 09 07 14 08 1700 (c) PACE MW-2 01124/94 2633 563 -- 2070 ND<50 ND<0 5 ND<0 5 ND<0 5 06 --- -- PACE MW-2 06107194 2633 608 -- 2025 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 - 28 PACE MW-2 09/13/94 2633 636 - 1997 ND<50 ND<0 5 ND<0 5 ND<0 5 ND<0 5 - 81 PACE MW-2 01/10/95 2633 554 2079 100 6 2 ND<0 5 12 52 ATI MW-2 03/23/95 2633 563 --- 2070 ND<50 053 ND<0 50 051 19 --- 89 ATI MW-2 10/04195 2633 637 --- 1996 210 ND<1 0 ND<1 0 ND<1 0 ND<2 0 840 71 ATI MW-2 01104/96 2633 590 -- 2043 3900 ND<25 ND<25 ND<25 ND<50 12000 30 ATI MW-2 03/29196 2633 659 --- 1974 9200 34 9 3 4 12000 36 SPL QC-1 (d) 03/29/96 -- -- - --- 11000 37 9 4 5 13000 --- SPL MW-2 07/01/96 2633 716 --- 1917 5200 58 33 ND<1 ND<1 10000 31 SPL MW-2 10/15/96 2633 734 --- 1899 ND<250 ND<2 5 ND<5 0 ND<5 0 ND<5 0 14000 40 SPL MW-2 04/16/97 2633 598 --- 2035 180 ND<0 5 ND<1 0 ND<1 0 ND<1 0 57 42 SPL MW-2 10/15/97 2633 608 2025 N13<50 ND<0 5 ND<1 0 ND<1 0 ND<1 0 120 54 SPL QC-1 (d) 10/15/97 -- - -- ND<50 ND<0 5 ND<1 0 ND<10 ND<1 0 120 --- SPL MW-2 03/17/98 2633 557 – 2076 170 ND<0 5 ND<1 0 ND<1 0 ND<1 0 180 61 SPL MW-2 (h) 01/06/99 2633 -- - --- — --- --- - MW-2 09/13199 2633 561 --- 2072 480 35 73 ND<5 0 ND<5 0 99000(91000 --- --- Blaine Tech Services Inc Report,010117-X-2, BP Oil 11194 at 2375 Tracy Blvd ,Tracy,California Page 3