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Table 5 Summary of Ground Water Monitoring Data General Wa ter Quah ty Former Tank Site#1 1515 West Weber Avenue Stockton,CA i Heterotrophic Ferrous Ferric Well Date Plate Count Nitrate Chloride pH Conductivity Manganese Dmiade Methane Iron Iron Total Iron 1,3,5-TM$ 1,2,4-TMB Total TMB/ Identifier Sampled (CFU/ml) (mg/L) (mg/L) (US/Cm) (mg/L) (mg/L) (mg/L) (mg/l,) (ntg/L) (mg/L) (mg/L) (mg(L) Total BTEX MW-1 10/11/96 NA <0 020 35 74 1,400 0 025 435 <0 0218 <0 050 105 105 <0 005 <0 005 NC 12/18/96 NA 12 273 74 415 0 0107B <01 00029 <0 050 <0 050 <0100 <0 002 <0 002 NC 5/6/97 NA 018 348 74 368 00252 533 0 0023 <0 050 NA NA <0 002 <0 002 NC 9/19/97 NA 052 458 84 451 <0010 098 00020 <010 NA NA <0001 <0001 NC 12/1/97 NA 100 834 79 595 <0 010 320 00021 <010 NA NA <0 001 <0 001 NC * 12/1/97 NA 092 832 78 581 NA 330 00026 <010 NA NA <0 001 <0 001 NC 4/10/98 NA 047 353 so 403 <0 010 170 00010 <010 NA NA <0 001 <0 001 NC MW-2 10/11/96 NA <0 020 661 68 724 2 420 839 <0 0218 306 254 285 <0 005 <0 005 NC 12/18/96 NA <0 050 636 67 774 2 410 329 <0 0010 517 <0 050 <0100 <0 002 <0 002 NC 5/6/97 NA <0 050 724 67 756 2 990 426 0 074 177 NA NA <0 002 <0 002 NC 9/19/97 NA 0 061 626 68 719 28000 1400 <0 0010 0160 NA NA <0 001 <0 001 NC 4/10/98 NA <0 050 671 68 807 33000 8900 006 0200 NA NA <0 001 <0 001 NC MW-3 10/11/96 NA <0 020 241 68 1,410 1 300 749 <0 0218 221 8 80 309 <0 005 <0 005 NC 12/18/96 NA <0 050 244 68 1,570 1220 555 0175 176 <0 050 0 524 <0 002 <0 002 NC 5/6/97 NA 0 270 214 67 1,340 1 260 734 0 267 206 NA NA <0 002 <0 002 NC 9/19/97 NA 0 068 231 68 1,470 1500 1100 <0 0010 59 NA NA <0 001 <0 001 NC 4/10/98 NA 0280 255 68 1 540 13 1100 0 450 69 NA NA <0 001 <0 001 NC MW-4 10/10/96 2,090 0 090 42 75 618 1560 474 <0 0218 0146 0 280 0 426 000785 <0 005 0 234 12/17/96 13,500 0 091 465 84 742 0 578 <01 0 083 <0 050 0 435 0 435 <0 002 <0 002 NC 5/6/97 2,8001000 0 055 495 so 598 0 508 <0 060 0 022 <0 050 NA NA <0 002 <0 002 NC 9/18/97 6,200 0 061 408 79 632 0 460 410 0 010 <O 10 NA NA <0 001 <0 001 NC 12/2/97 11,400 0 080 465 81 600 0 250 170 0 036 <010 NA NA <0 001 <0 001 NC 4/9/98 13,400 0 079 482 91 606 <0 010 <017 0 028 <010 NA NA <0 001 <0 001 NC M W 5 10/10/96 2,000 <0 020 382 70 385 2 380 833 <0 0218 442 196 638 <0 005 000514 0 006 12/17/96 69,000 011 394 76 1,040 1400 14 237 <0 050 455 455 <0 050 <0 050 NC 5/6/97 52,000 0 099 426 72 741 2170 264 150 0 990 NA NA <0 050 <0 050 NC 9/18/97 26,400 0 340 348 73 841 0 990 19 0 330 <010 NA NA <0 005 <0 005 NC 12/2/97 35 000 0]DO 434 74 797 1200 18 I 1 <010 NA NA <0 005 <0 005 NC 4/9/98 11500 012 474 74 874 13 27 18 <010 NA NA <0005 <0005 NC NOTES * - Duplicate sample taken NA - Not analyzed B - Estimated concentration NC - Not Calculated because one or more constituents(TMB or BTEX)were not detected CFU/ml - Colony forming units per milliliter TMB - Trimethylbenzene mg/l - nulligrams per liter uS/cm - Microsiemens per centimeter Catellus/299610-10/13/99 Page 1 of 1