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TABLE 4b GROUNDWATER TREATMENT SYSTEM DATA Thrifty Oil Station#172,7647 Pacific Ave,Stockton, CA Discharge TotafiCum Average I N L E F (ug/0 O U T LET u IL Totalizer Discharge TRPH LEL COMMENTS DATE Reading Discharge Flow LTPHg B T E X MTBE ) T E X MTBE pH(gallons) allda 15M} (8021) (8021) (8021) (8021) (8021) (4180 (802€) (8021) {8021) (8021) (8021) (1501) (sensor) 419103 10 93 114 - - 1 20 gallons system wRh new water meter Starting at t 4110103 730 93 834 720 148 000 32 300 31 800 22608420 V258 1 890 <0 5 <0 04 <0 02 <0 02 <0 06 <0 03 898 080 Also collected annual samples 4117103 1 340 94 444 87 - - - - - - 090 4124/03 1 490 94 594 21 - 070 511103 1 530 94 634 6 0 80 Checked for dogs and cleaned pump water lines 518103 2 730 95,834 171 000 5115/03 2 920 96 024 27 080 5120103 3 711 96,815 158 - 100 Shut down system for OWS 5121/03 3 711 96 815 0 100 Restarted Shut dorm for 1091 calibration reports for LEL d flow as 5122103 3 792 96 896 81 7 230 524 531 20 8 810 <0 5 <0 04 <0 02 <0 02 <0 06 <0 03 879 100 required by the City of Stockton kept system off for carbon change 6120103 3 792 96 896 0 - Restarted system(carton charge on W111r03) 6126103 4 352 97 456 93 - 120 713103 5 478 98,582 161 - 100 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 03 888 1 04 rester pH number was reap m the field using Hyden 910 Digital 719103 6 869 99 973 218 - - - - - - - 1 00 7117!03 8 649 101 753 223 500 807 11 244 58 87 J 1 0 <0 04 <0 02 <0 02 <0 06 <0 03 8 65 1 20 p�Hterm was read in the field using Hydac 910 ogital 7124103 9,341 10244.5 99 - - - 100 7130/03 9 732 102 836 65 - 080 Shut down GW system for carbon charge 818103 9 825 102 929 - 2 00 ( m z to 9 g sa rainrg o now carbon with fresh water 8114103 11 081 104 185 209 230 8118703 11 263 104 367 46 - 230 Shut down system for OWS 8121103 11 263 104 367 0 - 220 Restarted 8127103 11 978 105 082 119 87100 16 600 12100 404 6 490 42 700 <0 5 <0 04 14 <0 02 <0 06 <0 03 652 230 915103 12 806 105 910 92 - - - - - - - 240 Shut down system for carbon change System SLB off (from 12 808 to 12 800 gal soakwlg& 9111/03 12 890 105 994 - - 1 DD draining of new carbon with fresh water) 9118/03 12 890 105 994 - 150 System Stu[off 9124103 10 - - 59 700 90 12 1 <0 2 <0$ 1 16 300 <0 5 <0 04 <0 02 <0 02 090 <0 03 656 180 Restarted Replaced water meter startft at 10 gall 9125103 430 106 414 420 - - - - - - - - - 236 iFoundsWemoff pump broken down restarted 1012103 7 180 113 164 964 238 1019103 7 970 113 954 113 385 Shirt down system for carbon change Restarted(from 7 970 to 8 420 gal soaking 8 draining of 10/15103 8 420 114 404 75 - - 126 new carbon with fresh water) 10/16103 8 650 114 634 230 22 400 4 500 4 920 193 2 040 '4611152 <0 5 <0 04 <0 02 1 <0 02 <0 06 <0 03 56 186 10/23/03 9 930 115 914 183 - Il 20 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 Shot dkmn syslem for carbon charge Restarted(from 22 430 to 23 200 gal soaking S draining of 11119103 23 260 129 264 121 1 80 new carbon with fresh water) 11/20103 233901 129 374 j 110 118 000 2 850 18 900 2 600 17 700 '2971169 <0 5 <0 04 1 0 97 1 <0 02 <0 06 1 <0 03 7 67 1 138 172TAB4 GW Sysfem Page 1 of 4 711912005