Sample collection and analytical requirements for inorganic contaminants

Sample collection and analytical requirements for inorganic contaminants. (1) analytical methods. Analyses conducted to determine compliance with s. NR 809.11 shall be made in accordance with methods listed in Table A. (2) Sample collection. Sample collection for the inorganic contaminants under s. NR 809.11 (2) shall be conducted using the sample preservation, containers and maximum holding time procedures specified in Table B. In all cases, samples should be analyzed as soon after collection as possible. (3) Laboratory certification. Analyses under this section shall only be conducted by laboratories that have received certification under ch. NR 149 or approval by EPA. (a) To receive certification to conduct analyses for antimony, arsenic, asbestos, barium, beryllium, cadmium, cyanide, fluoride, mercury, nickel, nitrate, nitrite, selenium and thallium, a laboratory shall carry out annual analyses of performance evaluation samples approved by the department or EPA. (b) For each contaminant that has been included in the performance evaluation sample and for each method for which a laboratory desires certification, the laboratory shall achieve quantitative results that are within the following acceptance limits: (4) Composite sampling. Composite sampling for inorganic contaminants shall meet the following requirements: (a) The department may reduce the total number of samples a public water system is required to analyze by allowing the use of compositing. Compositing shall only be permitted for entry points within a single public water system. Composite samples from a maximum of 5 entry points are allowed, provided that the detection limit of the method used for analysis is less than one-fifth of the MCL. (b) Compositing of samples shall be done in the laboratory. (c) If the concentration in the composite sample is greater than or equal to one-fifth of the MCL of any inorganic contaminant, a follow-up sample shall be taken from each entry point included in the composite and analyzed within 14 days. These samples shall be analyzed for the contaminants which exceeded one-fifth of the MCL in the composite sample. (d) If duplicates of the original sample taken from each entry point used in the composite are available and the holding time listed in sub. (2) Table B has not been exceeded, the water supplier may use these instead of resampling. The duplicates shall be analyzed and the results reported to the department within 14 days of the composite analysis. (e) The detection limits in Table C, are the detection limits that laboratories shall use for each analytical method and MCLs for inorganic contaminants specified in this section and s. NR 809.11 :