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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 LAS ID SAMPLING/ ELEVATION (a) WATER ELEVATION (b) (ug/1) (ug/1) (ug/1) (ug1l) (ug') (ug11) (ug/1) (ug/1) (ug/1) (ppm) MONITORING (Feet) (Feet) (Feet) MW-4 12/21/92 543 21 68 -1625 110 -- — ND<O 5 ND<O 5 ND<O 5 ND<O 5 --- MW-4 04/04/93 543 1880 -1337 180 -- — 1 1 ND<O 5 ND<O 5 09 — ND (g) --- PACE QC-1 (d) 04/04/93 --- --- -- 310 --- -- 19 ND<O 5 ND<O 5 09 --- -- — PACE MW-4 04/26193 543 1855 -1312 --- ND<50 ND<5000 -- --- --- --- -- --- --- --- MW-4 10/05/93 543 1930 -1387 140 ND<50 ND<5000 ND<O 5 ND<O 5 ND<O 5 ND<0 5 --- ND (g) --- PACE QC-1 (d) 10/05/93 -- --- -- 160 --- — ND<O 5 ND<0 5 ND<O 5 ND<O 5 --- --- --- PACE MW-4 01/07194 543 1905 -1362 100 --- — ND<O 5 ND<O 5 ND<O 5 ND<O 5 --- --- -- PACE MW-4 04/20/94 543 1831 -1288 74 -- -- ND<O 5 ND<O 5 ND<O 5 1 3 — 41 PACE MW-4 04125/94 543 1828 -1285 -- - -- — - --- -- --- _-- _-- -_- MW-4 07128!94 543 1871 -1328 66 --- --- ND<O 5 ND<0 5 ND<O 5 ND<O 5 — 40 PACE MW-4 12/09/94 543 1920 -1377 50 — -- ND<O 5 ND<O 5 ND<O 5 ND<1 --- -- 44 PACE MW-4 03103/95 543 1787 -1244 ND<50 -- --- ND<O 50 ND<O 50 ND<O 50 ND<1 0 --- 46 ATI MW-4 04/12/95 543 1659 -11 16 ND<50 --- --- ND<0 50 ND<0 50 ND<0 50 ND<1 0 --- --- 79 ATI MW-4 07/20/95 543 1697 -1154 ND<50 — - ND<0 50 ND<O 50 ND<0 50 ND<1 0 --- --- 46 ATI MW-4 11/02/95 543 1781 -1238 ND<50 --- — ND<O 5 ND<O 5 ND<0 5 ND<1 0 ND<5 0 --- 4 1 ATI MW-4 01/15/96 543 1721 -1178 N0<50 --- --- ND<O 50 ND<O 50 ND<0 50 ND<1 0 ND<5 0 -- --- ATI MW-4 04/22196 543 15 11 -968 ND<50 --- ND<O 5 ND<1 ND<1 ND<1 ND<10 --- --- SPL MW-4 07/12/96 543 1542 -999 ND<50 --- -- ND<O 5 ND<1 ND<1 ND<1 ND<10 --- 22 SPL MW-4 11/14/96 543 1630 -1087 ND<50 --- ND<O 5 ND<1 0 ND<1 0 ND<1 0 ND<10 --- 34 SPL MW-4 03/11/97 543 1350 -807 — - --- --- --- --- --- _ ___ __- MW4 05/22/97 543 1411 -868 -- --- — - - -__ MW-4 08/06197 543 1497 -954 — — -- — — — _ ___ ___ MW-4 09122197 543 1509 -966 --- --- -- -- --- --- --- -- -- _-- MW4 01107/98 543 1528 -985 ND<50 — -- ND<0 5 ND<1 O ND<1 0 ND<1 0 ND<10 -- 65 SPL MW4 07/01/98 543 1161 -018 --- -- -- -- — --- --- --- MW-4 09/18/98 543 13 17 -774 --- -- — -- -- -- __ ___ MW-4 01/19/99 543 1376 -833 ND<50 -- — ND<1 0 ND<1 0 ND<1 0 ND MW-4 10/14/99 543 1404 -861 ND<50 -- — ND<1 0 ND<1 0 ND<1 0 ND<1 0 40 -- -- SPL MW-4 01/20100 543 1387 -844 ND<50 -- --- ND<O 5 ND<O 5 ND<0 5 ND<O 5 97 -- PACE MW-4 05/04/00 543 1128 -585 ND<50 --- -- ND<O 5 ND<O 5 ND<O 5 ND<O 5 78 — --- PACE MW-4 07/14/00 643 1247 -704 ND<50 — --- ND<O 5 ND<O 5 ND<O 5 ND<O 5 37 --- -- PACE MW-4 10/27/00 543 1343 -800 ND<50 — — ND<O 5 ND<O 5 ND<O 5 ND<O 5 12 --- --- PACE MW-4 01119/01 543 1330 -787 ND<50 --- -- ND<O 5 ND<O 5 ND<O 5 ND<O 5 19 --- --- PACE Blaine Tech Services,Inc,Report 010119-K-1, BP Oil 11193 at 3202 W Hammer Lane,Stockton Caltfomia Page 5