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TABLE 1-SUMMARY OF RESULTS OF GROUNDWATER MONITORING WELL DATE OF CASING DEPTH TO GROUNDWATER TPH-G TPH-D TPH B T E X MTBE HVOC DO LAB ID SAMPLING/ ELEVATION (a) WATER ELEVATION (h) (ug11) (ug/1) (ug11) (uglf) (ug/1) (ug/1) (ugll) (ug/11) (ugll) (ppm) MONITORING (Feet) (Feet) (Feet) MW-2 12121/92 482 2126 -1644 1500 --- — 120 96 10 24 -- - - — MW-2 04/04/93 482 1845 -1363 2600 — — 460 13 77 81 — — PACE MW-2 04/26193 482 18 11 -1329 --- - - --- --- -- -- — --- - MW-2 10/05193 482 1885 -1403 1500 3200 120 540 710 -- --- --- PACE MW-2 01107/94 482 1848 -1366 1900 — — 400 13 56 79 410 (c) --- -- PACE MW-2 04/20/94 482 1782 -1300 18000 --- — 3700 120 610 900 7100 (c) - 43 PACE MW-2 04/25194 482 1780 -1298 --- — - -- --- --- -- -- --- --- --- MW-2 07/28194 482 1814 -1332 28000 --- — 5300 80 750 340 -- --- 43 PACE MW-2 12109/94 482 1871 -1389 32000 — — 4000 150 760 800 -- --- 43 PACE MW-2 03/03/95 482 1735 -1253 2600 (e) — -- 540 68 96 64 — --- 49 ATI MW-2 04/12195 482 1623 -1141 1800 --- 360 33 70 50 --- 76 ATI QC-1 (d) 04112/95 -- -- -- 1900 -- — 360 32 70 51 --- --- -- ATI MW-2 07/20/95 482 4645 -1163 8800 (e) --- --- 1600 22 290 290 --- --- 64 ATI QC-1 (d) 07/20/95 -- --- --- 7200 (e) --- -- 1300 17 240 240 --- -- — ATI MW-2 11/02/95 482 1730 -1248 5000 -- — 780 14 150 140 7900 --- 52 ATI QC-1 (d) 11/02/95 --- --- --- 4800 --- -- 840 15 160 140 8400 --- — ATI MW-2 01/16/96 482 1666 -1184 2000 --- — 300 86 62 48 3200 — — ATI QC-1 (d) 01/16/96 --- -- — 2000 --- — 290 84 59 44 3000 — — ATI MW-2 04/22/96 482 1482 -1000 680 --- — 140 4 36 12 1700 --- --- SPL QC-1 (d) 04/22/96 --- -- -- 490 -- --- 130 3 34 11 2100 --- --- SPL MW-2 07/12/96 482 1512 -1030 4800 --- -- 890 19 190 52 19000 -- 22 SPL QC-1 (d) 07/12/96 — -- — 5300 --- --- 990 21 220 55 20000 --- --- SPL MW-2 11/14/96 482 1603 -1121 24000 --- --- 590 25 70 ND<25 18000 -- 29 SPL QC-1 (d) 11/14/96 -- --- --- 23000 --- — 570 ND<25 68 ND<25 21000 — --- SPL MW-2 03/11/97 482 1286 -804 770 --- — 12 ND<5 0 ND<5 0 ND<5 0 970 -- 40 SPL MW-2 05/22/97 482 1345 -863 2700 --- — 76 12 93 2 1 3100 -- 42 SPL QC-1 (d) 05/22/97 --- — --- 2800 --- — 77 1 1 95 2 1 3400 --- --- SPL MW-2 08106/97 482 1432 -950 -- -- --- --- — -- -- --- --- 63 -- MW-2 09122/97 482 1341 -859 2400 --- 730 10 79 74 2100 --- 65 SPL MW-2 01/07198 482 1437 -955 16 --- — 90 ND<5 0 ND<5 0 ND<5 0 17000 — 60 SPL QC-1 (d) 01/07/98 --- -- --- 12 -- -- 110 ND<1 0 ND<1 0 23 18000 -- --- SPL MW 2 07/01/98 482 1078 -596 1200 --- --- 22 ND<1 0 21 ND<1 0 4900 --- 48 SPL QC-1 (d) 07101/98 --- --- --- 1000 --- --- 22 ND<1 0 19 ND<1 0 4800 --- --- SPL MW-2 09/18198 482 1251 -769 12000 -- 69 18 ND<100 77 14000 --- 56 SPL QC-1 (d) 09118/98 --- — --- 13000 -- -- 56 17 ND<100 59 15000 -- --- SPL MW-2 01/19/99 482 1251 -769 3500 --- -- ND<1 0 ND<1 0 ND<1 0 ND<1 0 3600 — --- SPL MW-2 0) 10/14/99 482 1339 -857 --- --- --- --- — -- -- --- --- --- Blaine Tech Services,Inc Report 000504-S-1, BP Oil 11193 at 3202 W Hammer Lane,Stockton,California Page 2