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0 TABLE 4b GROUNDWATER TREATMENT SYSTEM DATA Thrifty Oil Station#172 7647 Pacific Ave Stockton,CA Discharge Total/CumAverage I N L E T u fL O U T L E T u 1L Totalizer Discharge TRPN LEL CpMMENT$ DATE Reading Discharge Flaw TPHg B T E X MTBE B T E X MTBE pFE (gallons) (gallons) aVda (8015M) (8021) (8021) (8021) (8021) (8021) ( B�) (8021) {8623) (6021) (6021) (8021) (1 501) sensor 8119104 205 670 311 654 0 12 000 <1 4 17 17 30 7 590 <05 <014 <0 16 <0 18 <0 45 <0 22 748 324 Restarted&changed carbon 6/26104 213 290 319 274 1 089 362 911104 217 140 323 124 642 14 600 12 31 10 32 8 ON <05 <014 <016 <018 <0 45 <0 22 57 342 913104 219 750 325 734 1 305 - - - - - - - 404 919!04 223 340 329 324 598 413 Shut down system 9128104 223 960 329 944 1 33 4 34 Restarted 1011104 229 730 335 714 1923 Shut down system to replace sensor 1 MIN 229 730 335 714 0 .231 Restarted 10113104 236 278 342 262 819 341 Shut dawn system for carbon change 10/19/04 236 350 342 334 12 232 000 30 400 34 100 3 280 14 500 844 <05— <014 <0 16 <0 18 <0 45 <0 22 5 17 319 Restarted 10126/04 238 270 344 254 274 - - 380 1112104 244 850 350 834 940 - - 432 1119104 247 440 353 424 370 - - 243 Shut down system for carbon change 11/18104 247 530 353 514 10 179 000 32 900 34 400 2 470 12 800 1 330 <0 5 <0 14 1 1 <0 18 <0 45 <0 22 520 343 Restarted 11124/04 248 100 354 084 95 - - - - - 340 11/30/04 1 249 970 355 954 312 356 12(7104 252 950 358 934 426 353 12/14/04 253 290 359 274 49 0 30 Shut down system for carbon change 12121104 253 420 359 404 19 209 000 18 100 21 200 1 960 13 100 74 600 <0 5 <0 14 <0 16 <0 18 <0 45 <0 22 528 1 BO Restarted 12128104 258 180 364 164 680 - - - - 238 114105 263 820 369 B04 806 341 1111105 270 660 376 644 977 341 1/18/05 277 200 383 184 934 000 Shut dawn system for carbon change 1125105 277 320 383 304 17 151 000 12 700 14 800 873 8 160 55 500 <0 5 <0 14 <016 <0 18 <0 45 <0 22 531 148 Restart 2111D5 281 910 387 894 656 - - - - - 231 218105 285 330 391 314 489 202 000 12 800 15 000 643 8 090 84 800 <05 <0 14 <0 16 <01B <0 45 <0 22 532 320 2117105 288 280 394 264 328 - - - - - 341 2121105 291 850 397 834 893 - Shut down system for Qws 311105 291 970 3979541 15 242 Restart 318105 331 410 437 394 5 634 0 06 Shut down system for carbon change 3115/05 331 630 437 614 31 15 100 724 605 19 1 810 77004700 <0 5 <0 14 093 <0 18 <0 45 <0 22 563 306 Restart after carbon change 3122105 371 620 477 604 5 713 - - - 1 05 3129105 375 290 481 274 524 1 195 4112105 381 210 487 194 423 241 4119105 385 300 491 284 584 169 000 41 300 29 800 2 490 11 900 2 470 <0 5 <0 14 <0 16 <0 18 <0 45 <0 22 532 234 4126105 392 130 498 114 976 - - 224 519105 408 200 514 184 1 236 - - 221 Shod down both systems for Q W S 5/16105 408 220 514 204 3 126 000 31 500 23 000 614 10 100 1 290 <0 69 <0 14 <0 16 <0 18 <0 45 <0 22 536 243 Restart 5123105 4130101 5169941 684 - - - - 211 5131105 416 450 522 434 430 - - Shut down system on 615105 for carbon change 618{05 419 770 525 754 415 176 000 52 200 54 700 4 520 25 000 3 480 <0 69 1 <0 17 14 <0 14 <0 38 <0 47 541 143 6/13105 422140 528124 474 - 211 172TAB4 GW System Page 3 of 4 10/25/2005