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TABLE 0 GROUNDWATER TREATMENT SYSTEM DATA Thrifty Oil Station# 172 7647 Pacific Ave,Stockton CA Disc TotatlCum Average I N L E T u L OUTLET u {L Totalizer g Discharge TRPH LEL DATE Reading Discharge Flaw TPHg B T E X MTBE B T E X MTBE pH COMMENTS ailons (gallons) al/da (8015M) (8021) (8021) (6021) (8021) (8021) (1B 1) (8021) (8021) (8021) (6021) (8021) (1501) (held) mgtL sensor 8119104 205 670 311 654 0 12 000 <1 4 17 17 30 7 590 <0 5 <0 14 <0 16 <018 <045 <0 22 748 3 24 Restarted 6 changed carbon 8/26104 213 290 319 274 1 089 - - - - 362 911104 217 140 323 124 642 14 600 12 31 10 32 8 080 <0 5 <0 14 <0 16 <0 18 <045 <0 22 5 7 342 913104 219 750 325 734 1 305 4 04 919104 223 340 329 324 598 4 13 Shut dorm system 9128104 223 960 329 944 33 4 30 Restarted 1011104 229 730 335 714 1 923 Shut dorm system to replace sensor 1015104 229 730 335 714 0 231 Restarted 10/13/04 236 278 342 262 819 - 341 Shut down system for carbon change 10/19/04 236 350 342 334 12 232 000 30 400 34 100 3 260 14 500 844 <05 <0 14 <0 16 <0 18 <0 45 <0 22 5 17 319 Restarted 10126/04 238 270 3442-54 274 - 380 11/2104 244 850 350 834 940 - 432 11/9104 247 440 353 424 370 243 Shut doom system for carbon Mange 11/18/04 247 530 353 514 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 11/24/04 248 100 354 084 95 - 340 11/30/04 249 970 355 954 312 3 56 1217104 252 950 358 934 426 _ 353 12/14104 253 290 359 274 49 0 30 Shut down system for carbon change 12/21/04 253 420 359 404 19 209 000 18 100 21 200 1 960 13 100 74 800 <05 <0 14 <0 16 <0 18 —<0 45 <0 22 528 1 80 Restarted 12/28104 258 180 364 164 680 - 2 38 1/4/05 263 820 369 804 806 - 341 1111105 270 660 376 644 977 _ 341 1!18105 277 200 383 184 934 - - 0 00 Shut dawn system for carbon Mange 1125105 277 320 383 304 17 151 000 12 700 14 800 873 8 160 55 500 <0 5 <014 <0 16 <0 18 <0 45 <0 22 531 1 48 Restart 211105 281 910 387 894 656 231 M105 285 330 391 314 489 202 000 12 800 15 000 643 8090 84 800 <05 <0 14 <016 <0 18 <0 45 <0 22 5 32 320 2117105 268 280 394 264 328 - - 341 2121105 291 850 397 834 893 _ Shut down system for RWS 311105 291 970 397 954 15 242 Restart 3!8!05 331 410 437 394 5 634 0 06 Shut down system for carbon change 3115105 331 630 437 614 31 15 100 724 605 19 1 810 7 7004 700 <0 5 <0 14 0 93 <0 18 <0 45 <0 22 1 5 63 3 06 Restart ager carbon change 3122105 371 620 477 604 5 713 - 105 3129105 1 375 290 481 274 524 - 1 95 Maximum Discharge Rate 1 5 760 GROUNDWA TER DISCHARGE PERM T LIMITS 100 1 500 Total BTEX=4 570 0 5 50 1001 10% NOTE Analytical methods are as listed on the column headings unless otherwise noted 'MTBE 8021B18260B Beginning October 2004 ph values are measured in the field 172TA84 G W System Page 3 of 3 9 4/6/2005