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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) (ug/1) (ug/1) (ugll) (ug/1) (ug/1) WWI) (ug/1) (ugll) (ugll) (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 01/12/94 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 1062 -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 06/09/95 9.03 7.79 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<0.50 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 11102/95 903 10.30 -1.27 1800 1100 ND<0.50 ND<0.50 56 3.6 ND<5.0 --- 4.5 ATI QC-1 (e) 11102/95 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 9.03 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<1.0 ND<10 -- -- --- SPL MW-4 03/25/97 9.03 6.40 2.63 590 -- ND<0.5 ND<1.0 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 01/15/98 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 6.30 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<1.0 680 - --- 6.2 SPL MW-4 12/23/98 9.03 909 -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-4 03/22/99 9.03 785 1.18 4600 -- ND<1.0 ND<1.0 ND<1.0 ND<1.0 4400 --- --- -- SPL Blaine Tech Services, Inc., Report 990322-R-2, BP 11195 at 16500 1-5,Lathrop,California Page 4