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TABLE 1 -SUMMARY OF RESULTS OF GROUNDWATER MONITORING w. Y WELL DATE OF CASING p, DEPTH TO GROUNDWATER TPH-G TPN-D B T E X MTBE TOG HVOCs DO LAB iD SAMPLING/ ELEVATION (a) WATER ELEVATION (b) (ug/1) (ugli) (ug/1) (ugll) (ug/1) (ugll) (ug/1) (ug/1) (ug/1) (ppm) MONITORING (Feet) (Feet) (Feet) MW-3 12/21/92 9.79 11.84 -2.05 1300 --- 6.7 3.1 9.1 310 - - - --- PACE MW-3 05/17/93 9.79 9.05 0.74 3600 -- 20 9.3 470 700 --- - - --- PACE QC-1 (e) 05/17/93 9.79 --- -- 4000 --- 23 12 520 610 - - -- -- PACE MW-3 09/15/93 9.79 10.44 -0.65 38000 - 770 34 1700 3300 --- -- --- --- PACE MW-3 01/12/94 9.79 11.15 -1.36 380 - ND<0.5 ND<0.5 ND<0.5 ND<0.5 --- - -- 5.3 PACE QC-1 (e) 01/12/94 9.79 -- --- 400 - ND<0.5 ND<0.5 ND<0.5 ND<0.5 1400 (d) - -- -- PACE MW-3 05/12/94 9.79 10.45 -0.66 180 --- 0.7 ND<0.5 4.3 4.2 1400 (d) --- - 4.4 PACE QC-1 (e) 05/12/94 9.79 --- --- 170 -- 0.7 ND<0.5 3.8 3.9 270 (d) - - -- PACE MW-3 10/07/94 9.79 11.21 -1.42 120 -- ND<0.5 ND<0.5 ND<0.5 ND<0.5 -- -- -- 4.3 PACE QC-1 (e) 10/07/94 9.79 --- -- ND<50 -- 0.7 ND<0.5 ND<0.5 ND<0.5 --- -- -- PACE MW-3 12/08/94 9.79 11.40 -1.61 470 -- 1.1 1.8 ND<0.5 9.0 -- -- -- 4.8 PACE QC-1 (e) 12/08/94 9.79 --- -- 460 -- 0.7 1.1 ND<0.5 5.9 - -- --- -- PACE MW-3 02/21/95 9.79 9.11 0.68 4900 --- 6.4 ND<5.0 370 400 (c) -- - 8.2 ATI MW-3 06/09/95 9.79 8.59 1.20 --- --- -- --- --- --- --- --. --- -- MW-3 08/31/95 9.79 10.46 -0.67 5500 - 11 ND<5.0 890 460 4300 - 8.0 ATI MW-3 11/02/95 9.79 11.05 -1.26 -- - -- --- --- -- -- - - -- MVV-3 02/28/96 9.79 7.66 2.13 1600 - 3.2 ND<1 270 227 1200 --- --- 8.0 SPL QC-1 (e) 02/28/96 9.79 --- -- 1400 - 2.8 ND<1 240 204 1100 -- -- -- SPL MW-3 09/05/96 9.79 9.99 -0.20 3700 - ND<12 ND<25 420 ND<25 2100 - -- 7.7 SPL MW-3 03/25/97 9.79 7.18 2.61 5300 - 16 ND<25 ND<25 ND<25 7400 - -- 7-2 SPL QC-1 (e) 03125/97 9.79 --- --- 5400 -- ND<12 ND<25 ND<25 ND<25 7200 --- -- --- SPL MW-3 10/15/97 9.79 11.32 -1.53 1500 --- 9.1 2.3 320 73.5 8700 - - 5.3 SPL QC-1 (e) 10/15/97 9.79 -- --- 1400 - 8.4 1.5 250 57 7900 --- -- --- SPL MW-3 01/15/98 9.79 10.14 -0.35 24000 -- 20 ND<10 ND<10 ND<10 21000 --- 4.8 SPL MW-3 05/07/98 9.79 7.10 2.69 -- -- --- -- --- -- - -- --- -- W MW-3 09/03/98 9.79 9.32 0.47 81000 - ND<2.5 ND<5.0 360 100 78000 -- -- 6.3 SPL QC-1 (e) 09/03/98 9.79 -- -- 66000 --- ND<5 ND<10 350 100 73000 - - -- SPL MW-3 12/23/98 9.79 9.98 -0.19 62000 --- 4.2 ND<5.0 210 5.1 77000 - - -- SPL MW-3 (g) 12/31/98 9.79 --- --- -- - -- -_ - - -- -- - MW-3 03/22/99 9.79 8.60 1.19 12000 --- ND<1.0 ND<1.0 ND<1.0 ND<1.0 12000 - -- -- SPL Blaine Tech Services, Inc., Report 990322-R-2, BP 11195 at 16500 1-5, Lathrop,California Page 3