R315-265-92. Ground-Water Monitoring -- Sampling and Analysis

  (a) The owner or operator shall obtain and analyze samples from the installed ground-water monitoring system. The owner or operator shall develop and follow a ground-water sampling and analysis plan. He shall keep this plan at the facility. The plan shall include procedures and techniques for:

  (1) Sample collection;

  (2) Sample preservation and shipment;

  (3) Analytical procedures; and

  (4) Chain of custody control.

  Comment: See "Procedures Manual For Ground-water Monitoring At Solid Waste Disposal Facilities," EPA-530/SW-611, August 1977 and "Methods for Chemical Analysis of Water and Wastes," EPA-600/4-79-020, March 1979 for discussions of sampling and analysis procedures.

  (b) The owner or operator shall determine the concentration or value of the following parameters in ground-water samples in accordance with Subsections R315-265-92(c) and (d):

  (1) Parameters characterizing the suitability of the ground water as a drinking water supply, as specified in Appendix III to 40 CFR 265, which is adopted and incorporated by reference.

  (2) Parameters establishing ground-water quality:

  (i) Chloride

  (ii) Iron

  (iii) Manganese

  (iv) Phenols

  (v) Sodium

  (vi) Sulfate

  Comment: These parameters are to be used as a basis for comparison in the event a ground-water quality assessment is required under Subsection R315-265-93(d).

  (3) Parameters used as indicators of ground-water contamination:

  (i) pH

  (ii) Specific Conductance

  (iii) Total Organic Carbon

  (iv) Total Organic Halogen

  (c)(1) For all monitoring wells, the owner or operator shall establish initial background concentrations or values of all parameters specified in Subsection R315-265-92(b). He shall do this quarterly for one year.

  (2) For each of the indicator parameters specified in Subsection R315-265-92(b)(3), at least four replicate measurements shall be obtained for each sample and the initial background arithmetic mean and variance shall be determined by pooling the replicate measurements for the respective parameter concentrations or values in samples obtained from upgradient wells during the first year.

  (d) After the first year, all monitoring wells shall be sampled and the samples analyzed with the following frequencies:

  (1) Samples collected to establish ground-water quality shall be obtained and analyzed for the parameters specified in Subsection R315-265-92(b)(2) at least annually.

  (2) Samples collected to indicate ground-water contamination shall be obtained and analyzed for the parameters specified in Subsection R315-265-92(b)(3) at least semi-annually.

  (e) Elevation of the ground-water surface at each monitoring well shall be determined each time a sample is obtained.