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El SUMMARY OF GROUNDWATER NATION AND ANALYTICAL DATA � STOCKTON MAINTENANCE STATION STOCKTON,CAI IFORNIA Depth To Groundwater TPII-G TPII-D Benzene Toluene Fthyl- benzene Total MTBE Well 1 D Date TOC Elevation Xylenes Groundwater Elevation (pg/l} [µg11) [pg/l) (µgA) (µg11} (µ�) (pgA) MW-1 04/06/1992 2149 6596 __ -4447 4900----- 180• 1 100 360 <3 400 mW 1—_1012211993 21 49 _ 6792 -4643 27 000 -- 11 000 1500 -<50 1,400 MW 1 06/01/1994 2149 6568 44 19 1,500 <50 13 700 418 _14 5 206 MW-1 03/06/1995 2149 6501 4352 2200 __ 280 150 75 13 71 MW ldup _0310611995 2149 6501 4352 2 300 150 ----80 -_33 - 71-- mW-1 03/08/1995 2149 6503 -4354 --- --- MW 1 05!02!1995 2149 64 18 -4269 --- mW-1 - --- -MW-1 05!0511995 21 49 -- -- 2 900 <50 240 110 _ 13 -_ 100 MW-1 02/06/1996 2149 6203 4054 2200 <50 280 130 30 ll0 100 - ------ --- M W-1 04/11/1996 2149 6123 -3974 -- -- -- --- -- _ _ _ -- mW-1 0412311996 2149 6098 3949 4200 680 1 100_ 300 123 _ -300 25 MW-1 07/02/1996 2149 5992 3843 51 000 2,600 10,100 — 7200 1 100 6 600 38 MW-1 10/23/1996 2149 0016 3867 1,700 87 _440 37 49 70 32 --mW-1 _0512911997 J2149 55_16 3367 1700 <504 210_ 7 36 22 4 MW 1 1012211997_ 2149 - - 5753 -- ----3604_ _ 720 -- - - <500 --- 18 5 8 - - 27 _ 3 -_ - - 26 - MW-1 1212911997_ 2149 -- 5672 -3523 60- -<5000 _ 059 4--1-8- - _<0 5 17 <5 MW-1 03/16/1998 2149 53 31 -3182 70 90 2 1 23 <05 - 2 1 <5 MW-1 0612 611 99 8_ 2149 4948 2799 <500 <5000 _ <0 3 <0 3 - <0 3 <0 6 (<5) MW 1 0912811998_ 21 49 _ 513.6... 2987 <500 <5000 <0 3 ---<03- ---<03 <06- <0 6(<5) MW-I 12/02/1998 2149 4948 2799 <500 <400 50 40 -30 _-- - 14 - <1 0( MW-1 04/01/1999 2206 4595 -2389 <100 <100 <0[ <0 2 <0 I <0 I <O 6 MW 2 0410611992 2171 66 17 -4446 3,200 73" 450 _ 12 <3 49 MW-2 10/22/1993 2171 68 12 -4641 4 500 -- 1 000 93 v_25 __ _ 170 -- MW-2 06101!1994 2171 65 95 44 14 588 <50 337 151 _ <2 5 _ 45 7 --- MW-2 T 03/06/1995 21 7165 28 -4357 1 400 100 150 10 53 15 - MW 2 _4 03/08/1995 2171mm 65 21 43 50 - - - MW-2_ - 0510211995-- - 21_71 - 6436 - 4265 MW-2 05/05/1995 2171 - - 600 <50 78 11 2 5 10 MW-2 02/06/1996 2171 6296 -4125 <50 <50 23 -<03_ <0 3 <0 3 _<05 MW-2 04/11/1996 2171 6142 _-3971 -- --- -- MW 2 04/22/1996 2171 6112 -3941 70 90 _ 69 _ _ 06 _ _O 5_ _ ____<OS O8 MW-2 07101!1996 -- 2171 __ 6005 -3834 50 100 _ 35 <0_5_ _ <0 5 <0 5 05-- MW-2 10/22/1996 2171 6039 3868 400 200 86 <05--- 08__ __80 __ MW 2 05/28/1997 2171 _ 5544 3373 <500 <500 20 <O 3 _� 0 5 1 D __ <0 6 MW 2 1 1012111997 1 2171 5756 -35 85 <500 1 <500 1 19 1 1 1 1 08 1 24 j 1 1172 ZN-L�.I, Page 1 of 8 I