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TABLE 4b GROUNDWATER TREATMENT SYSTEM DATA Thrifty Oil Station#172 7647 Pacific Ave, Stockton CA Discharge TotallCum Average INLET u 1L O U T L E 7 u lL Totalizer Discharge TRPH DATE Reading Discharge Flow TPHg U T E X MTBE B T E X MTBE PR (field)LEL COMMENTS (gallons) (gallons) aVda (8015M) (8021) (8021) (8021) (8021) (8021) (mq L) (8021) (6021) (8021) (6021 (6023} (150 1) sensor 419103 10 93 114 - - _ - 1 2D Restarted GW system will now water meter staring at 10 gallons 4110103 730 93 834 720 148 000 32 300 31 800 2 260 8 420 1 890 <05 <0 04 <0 02 <0 02 <0 06 <0 03 8 98 D 80 Also collected annual samples 4117103 1 340 94 444 87 - - - 0 90 4124/03 1 490 94 594 21 _ _ 070 511103 1 530 94634 6 084 Checked for clogs and cleaned pump water Wes 518103 2 730 95 834 171 - 060 5!15103 2 920 96 024 27 0 80 5120103 3 711 96 B15 156 - - - 1 00 shut down system for pW5 5121!03 3 711 .96815 0 - - - 1 00 Restarted Shut dorm for metial calibrator,reports for LEL 6 flow as 5122103 3 792 96 896 81 7 230 524 531 2 0 258 8 810 <0 5 <0 04 <0 02 <0 02 <0 06 <0 03 879 1 00 required by the ety of Smckton kept system off for carbon change 6120103 3 792 96 896 0 - - - - - Restarted system(carbon change on 611 NO3) 6!26103 4352, 97 456 93 120 713103 5 478 98 582 161 1 00 7/7103 6 434 99 538 239 39 500 6 170 5 360 234 1 880 13 800 <0 5 <0 04 <0 02 <0 02 <0 06 <0 03 B BB 1 00 pH number was read n the field using Hydac 910 Digrlal tester 719103 6 869 99 973 218 1 00 7117103 8 649 101 753 223 500 807 11 244 58 97 J 1 0 <0 04 <0 02 <0 02 <0 06 <0 03 B65 1 20 pH number was read n the field using Hydac 910 Digital tester 7124/03 9 341 102 445 99 - - 1 00 7130/03 9 732 102 836 65 - 0 80 Shut down GW system for carbon change 8/8103 9 825 102 929 - 2 00 Restarted (hum 9 732 to gal soakng 6 dranmg o new carbon wch fresh water 8114103 11 081 144 185 209 - 230 8118!03 11 263 104 367 46 = 2 30 shut down system tui TOWS 8121103 11 263 104 367 0 _ 220 Restarted 8127103 11 978 1.05082 119 87 100 16 600 12 100 404 6 490 42 700 <05 <0 04 1 4 <0 02 <0 06 <0 03 652 1 230 915103 12 806 105 910 92 - - - 240 Shut down system for tartan change 9111103 12 890 105 994 - - _ System still off (from 12 806 to 12 890 gal scaling 8 9118103 12890 105994 - _ _ - 100 drammg el new carbon with fresh water) 150 System sbll off 9124103 10 - 59 700 90 12 <0 2 <0 6 16 300 <05 <0 04 <0 02 <0 02 0 99 1 <0 03 656 180 Restarted Replaced water meter starting at 10 gall 9125!03 430 106 414 420 236. Found system off pump broken down restarted 1012/03 7 180 113 164 964 2 38 1019103 7 970 113 954 113 385 Shut down system for carbon change 10115103 8 420 114404 75 1 26 Restarted(from 7 970 to 8 420 gal soaking 8 draining of new carbon with fresh water) 10!16103 8 650 114 634 230 22 400 4 500 4 920 193 2040 -461/152 <0 5 <0 04 <0 02 <0 02 <0 06 <0 03 56 1 86 10123/03 9 930 115 914 183 - - - 120 10/30/03 12 870 118 854 420 208 1115103 20 160 126 144 1 215 - 236 11/12/03 22 430 128 414 324 _ 263 Shut down system to carbon change 11119103 23 280 129 264 121 - 1 80 Restarted(from ith 22 430 to 23 NO gal soaking 8 dcammg of w carbon wfresh water) 11120103 23 390 129 374 110 118 000 2 850 18 900 2 800 17 700 "2971169 <0 5 <0 04 0 97 <0 02 <0 06 <0 03 767 138 172TAB4 G W System Page 1 of 4 10/25!2005