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TABLE 1 SUMMARY OF RESULTS OF GROUNDWATER MONITORING WELL DATE OF CASING DEPTH TO GROUNDWATER TPH-G TPH-D B T E X MTBE TOG HVOCs DO LAB ID SAMPLING/ ELEVATION (a) WATER ELEVATION (b) (ugll) (ug") (ug11) (ugll) (ug/1) (ug/1) (ug/1) (ug/4) (ug/1) (ppm) MONITORING (Feet) (Feet) (Feet) MW-4 12/21/92 9.03 11.06 -2.03 10000 ND<5 ND<2.5 3.5 300 540 - ND<50 ND (f) - PACE MW-4 05/17/93 9.03 8.25 0.78 6600 7.7 3.3 840 1000 --- --- -- PACE „ MW-4 09/15/93 9.03 9.64 -0.61 16000 - ND<12 ND<12 1000 1300 --- -- -- --- PACE QC-1 (e) 09/15/93 9.03 --- --- 16000 18 ND<12 1000 1200 --- --- --- PACE MW-4 01112!94 9.03 10.38 -1.35 3200 6.2 1.4 150 112 --- - --- 4.8 PACE MW-4 05/12/94 9.03 9.70 -0.67 160 --- ND<0.5 2.5 0.7 ND<0.5 --- --- --- 5.0 PACE MW-4 10/07/94 9.03 10.46 -1.43 13000 -- 11 2.1 1100 33 --- - - 4.8 PACE MW-4 12/08/94 9.03 10.62 -1.59 5400 --- 20 27 490 54 --- --- 5.3 PACE MW-4 02/21/95 9.03 8.29 0.74 11000 --- ND<25 ND<25 990 460 - - --- 7.7 ATI QC-1 (e) 02/21/95 9.03 --- --- 11000 --- ND<10 ND<10 990 450 --- ATI MW-4 06/09195 9.03 779 1.24 88 --- ND<0.50 ND<0.50 ND<0.50 ND<1.0 - --- 4.6 ATI QC-1 (e) 06/09/95 9.03 -- -- 810 --- ND-c0.50 0.52 22 2.5 --- --- --- ATI MW-4 08/31/95 9.03 9.73 -0.70 2500 --- ND<13 ND<13 130 14 ND<130 --- --- 7.6 ATI QC-1 (e) 08/31/95 9.03 -- -- 2800 --- ND<13 ND<13 160 17 ND<130 --- --- --- ATI MW-4 11/02/95 9.03 10.30 -1.27 1800 1100 ND<0.50 ND<0.50 56 3.6 ND<5.0 - -- 4.5 ATI QC-1 (e) 11/02/95 9.03 --- -- 1300 --- ND<1.0 ND<1.0 38 2.7 ND<10 - - --- ATI MW-4 02/28/96 9.03 6.87 2.16 2700 --- 2.6 1 220 75 ND<10 --- --- 8.0 SPL MW-4 09/05/96 903 9.19 -0.16 530 --- ND<0.5 ND<1.0 ND<1.0 ND<1.0 ND<10 --- 7.9 SPL QC-1 (e) 09/05/96 9.03 --- --- 110 --- ND<0.5 ND<1.0 ND<1.0 ND<10 ND<10 --- --- SPL MW-4 03/25/97 9.03 6.40 2.63 590 --- ND<0.5 ND<1 A 1.3 ND<1.0 ND<10 --- - 7.3 SPL MW-4 10/15/97 9.03 10.59 -1.56 1600 --- 3.6 ND<1.0 ND<1.0 ND<1.0 60000 --- --- 6.5 SPL MW-4 01/15198 9.03 9.37 -0.34 19000 --- .7.3 ND<10 ND<10 ND<10 18000 --- --- 5.6 SPL QC-1 (e) 05/07/98 9.03 --- --- 19000 --- 6.6 ND<10 ND<10 ND<10 18000 --- --- -- SPL MW-4 05/07/98 9.03 5.30 2.73 1100 - ND<0.5 ND<1.0 ND<1.0 ND<1.0 1100 --- - --- SPL MW-4 09/03/98 9.03 8.58 0.45 2400 - ND<0.5 ND<1.0 2.8 ND<1 A 680 --- - 6.2 SPL MW-4 12/23/98 9.03 9.09 -0.06 34000 - ND<2.5 ND<5.0 ND<5.0 ND<5.0 36000 --- --- 6.2 SPL MW-4 12/31/98 9.03 9.10 -0.07 29000 - ND<5.0 ND<5.0 ND<5.0 ND<5.0 40000 --- --- -- SPL MW-5 12/21/92 10.70 12.74 -2.04 ND<50 - ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- --- --- PACE MW-5 05/17/93 10.70 9.94 076 ND<50 110 ND<0.5 ND<0.5 ND<0.5 ND<1.0 --- ND<5.0 ND (f) - PACE MW-5 09/15/93 10.70 11.31 -0.61 ND<50 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- --- - --- PACE MW-5 01/12/94 1070 12,07 -1.37 ND<50 80 ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- ND<5000 NO (f) 4.5 PACE MW-5 05/12/94 1070 11.36 -0.66 ND<50 80 ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- ND<5000 ND (f) 4.5 PACE MW-5 10107/94 10.70 12.15 -1.45 ND<50 260 ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- ND<5000 NO (f) 4.4 PACE MW-5 12!08194 10.70 12.32 -1.62 ND<50 250 ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- ND<5000 ND (f) 4.5 PACE MW-5 02/21/95 10.70 10.01 0.69 ND<50 ND<50 ND<0.50 ND<0.50 ND<0.50 ND<1.0 110 ND (f) 7.8 ATI MW-5 06/09/95 10.70 9.49 1.21 --- --- --- --- - --- --- -- mW-5 08/31/95 10.70 11.39 -0.69 ND<50 230 ND<0.50 ND<0.50 ND<0 50 ND<1.0 ND<5.0 --- --- 8.2 ATI MW-5 11/02/95 10.70 11.99 -1.29 --- --- -- - - - - --- --- Blaine Tech Services, Inc., Report 981223-Y-1, BP 11195 at 16500 1-5, Latrop, California Page 3