Lubna landfill

Table 4. Influence of a vertical barrier on the quality of the first groundwater layer in years 1997-2000Date Groundwater quality before installation of vertical barrier (24.11.1997)No. of piezometerDissolvedsubstance[mg/l]COD Cr[mg O 2/l]Ammonia nitrogen[mg N NH4/l]Chlorides[mgCl - /l]Sulphates[mg SO 4 -2 /l]1 (1a) 890 430 0.6 218 1002 (2a) 5043 1125 61.1 1749 1533 14 030 6052 589 4257 853a 1040 827 35.4 218 1744 830 802 0.4 12 1204a 394 428 0.1 23 1205 (5a) 598 66 14 86 1247 (7a) 349 10 0.5 34 478 567 59 0.1 19 1379 (9a) 315 12 11 23 8610 386 29 0.1 19 7612 418 21 0.7 28 158III water quality class 2000 - 1.5 600 500acc. PIOŚ, 1995Closure of the vertical bentonite barrier (09.06.1998)Date Groundwater quality after installation of vertical barrier (09.11.2000)No. of piezometerDissolvedsubstance[mg/l]COD Cr[mgO 2 /l]Ammonia nitrogen[mg N NH4 /l]Chlorides[mgCl - /l]Sulphates[mg SO 4 -2 /l]1 (1a) 224 30 0.2 23 722 (2a) 2380 338 0.5 368 1103 12220 4810 397 3580 483a 998 380 8.5 88 1574 784 330 1.1 12 1814a 371 51 2.4 32 595 (5a) 750 60.3 0.9 100 2377 (7a) 420 26 0.4 43 588 566 207 1.3 84 1179 (9a) 1094 55 0.4 67 214.010 436 46 1.1 34 4212 810 40 0.1 93 234III water quality classacc. PIOŚ, 19952000 - 1.5 600 50024