Calculation of groundwater standards

Calculation of groundwater standards. (1) Baseline and detection monitoring. The owner or operator shall calculate and submit to the department for approval proposed PALs for all baseline and detection monitoring parameters that do not have s. NR 140.10 or 140.12 standards, except field pH, temperature and groundwater elevation, and ACLs for inorganic substances for which an exemption to a standard has been granted. Calculations of PALs and ACLs for each well shall be based on baseline data representative of groundwater quality not affected by the landfill unless the department determines that data from a well with similar groundwater quality may be used. A landfill owner or operator may propose or the department may initiate a reevaluation of approved groundwater standard exemptions and approved PALs and ACLs if background concentrations change. (2) Preventive action limits. The owner or operator of an existing solid waste disposal facility shall calculate PALs for baseline and detection monitoring parameters at the direction of the department. Applicants for a proposed solid waste disposal facility shall calculate and propose in the plan of operation PALs specific to each parameter and well, for all baseline and detection monitoring parameters that do not have s. NR 140.10 or 140.12 standards and all wells to be used in the monitoring program, unless otherwise directed by the department in writing. Detection monitoring parameters are listed in ch. NR 507 Appendix I , Tables 1, 1A, and 2. Calculations for PALs shall be done in accordance with the methods specified in s. NR 140.20 . PALs are not required for pH, temperature, or groundwater elevation. The department may require the owner or operator to conduct additional sampling if the department determines that the data used to calculate a PAL is not representative of baseline water quality not affected by the landfill. (3) Alternative concentration limits. Applicants for proposed solid waste disposal facilities shall calculate and propose in the plan of operation ACLs specific to each substance and well, that correspond to each exemption the department has granted to a groundwater standard listed in s. NR 140.10 or 140.12 , under s. NR 140.28 , for all wells to be used in the monitoring program, unless otherwise directed by the department in writing. The owner or operator of an existing solid waste disposal facility may request an exemption under s. NR 140.28 and propose calculated ACLs for any inorganic public health or welfare parameter that has established standards listed in s. NR 140.10 or 140.12 in accordance with s. NR 507.29 .