(a) Minimum requirements. Groundwater samples shall be collected and analyzed, as follows:
- (1) during each sampling event, one sample from each downgradient well; and
- (2) a minimum of four quarterly samples over one full year, or a number and frequency consistent with the appropriate statistical procedures and performance standards in the facility statistical analysis plan in 9-52 of this Subchapter, from each upgradient and downgradient well to establish background (unless already established) for any Appendix C constituents detected.
- (b) Subset of wells. The DEQ may specify a subset of wells to be sampled and analyzed during assessment monitoring.
Added at 20 Ok Reg 1151, eff 6-1-03
Amended at 39 Ok Reg 1074, eff 9-15-22