57.Subject to section 59, groundwater migrating into the soil where disposal areas or a leachate or water treatment system are sited must comply with the following limit values at the observation wells installed pursuant to section 65:
Parameters - Substances Limit values* Ammoniacal nitrogen (expressed as N) 1.5 mg/l Benzene 0.005 mg/l Boron (B) 5 mg/l Cadmium (Cd) 0.005 mg/l Chlorides (expressed as Cl-) 250 mg/l Chromium (Cr) 0.05 mg/l Fecal coliforms 0 CFU/100 ml Total cyanides (expressed as CN-) 0.2 mg/l Ethylbenzene 0.0024 mg/l Iron (Fe) 0.3 mg/l Manganese (Mn) 0.05 mg/l Mercury (Hg) 0.001 mg/l Nickel (Ni) 0.02 mg/l Nitrates + nitrites (expressed as N) 10 mg/l Lead (Pb) 0.01 mg/l Sodium (Na) 200 mg/l Total sulphates (SO4-2) 500 mg/l Total sulphides (expressed as S-2) 0.05 mg/l Toluene 0.024 mg/l Xylene (o, m, p) 0.3 mg/l Zinc (Zn) 5 mg/l
* The limit values correspond to the limit values that apply to water intended for human consumption.
In addition, the Minister may determine the parameters to be measured or substances to be analyzed on the basis of the composition of the residual materials received for disposal, and set the limit values to be complied with for those parameters or substances. The limit values may be in addition to or in substitution for the limit values set out in the first paragraph.