(1) For the purpose of determining compliance with standards and monitoring requirements other than those mentioned in subsection (2) below, samples shall be considered acceptable only if they have been analyzed by a laboratory certified in drinking water by the Department of Health to perform such drinking water analyses with the exception that measurements for alkalinity, bromide, calcium, chlorite at entrances to distribution systems, orthophosphate, silica, specific ultraviolet absorbance, or total organic carbon may be performed by operators licensed under Fl. Admin. Code Chapter 62-602, or by persons under the direct supervision of a licensed operator, and measurements for conductivity, disinfectant residual, pH, temperature, or turbidity may be performed by operators licensed under Fl. Admin. Code Chapter 62-602, by persons under the direct supervision of a licensed operator, or by any authorized representative of the Department. Approved analytical methods shall be used and are contained in the July 1, 2014, edition of 40 C.F.R. §§141.21, 141.23, 141.24, 141.25, 141.27, 141.74, 141.89, 141.131, 141.402, 141.704, 141.852, and 143.4 and Appendix A to 40 C.F.R. part 141, Subpart C (http://www.flrules.org/Gateway/reference.asp?No=Ref-05592), all of which are incorporated herein by reference. Use of an alternative analytical technique requires written permission from the Department and the U.S. Environmental Protection Agency. The use of DPD colorimetric test kits to measure residual chlorine, chloramine, or chlorine dioxide concentration is approved. This subsection shall be effective on July 7, 2015.
    (2) Measurements for residual disinfectant to demonstrate that TTHM and HAA5 samples were taken under normal operating conditions (see subsection 62-550.821(4), F.A.C.) and measurements for disinfectant residual to determine compliance with the operational requirements in subsection 62-555.350(6), F.A.C., may be performed by any authorized representative of the supplier of water or the Department; but measurements for residual chlorine shall be performed following the appropriate procedures in the Department of Environmental Protection Standard Operating Procedures for Field Activities, DEP-SOP-001/01, as incorporated into Fl. Admin. Code R. 62-160.800, and all other measurements shall be performed using an appropriate method referenced in subsection (1) above. Measurements for alkalinity, dissolved iron, dissolved oxygen, pH, total sulfide, or turbidity to evaluate treatment for control of copper pipe corrosion and black water (see subsection 62-555.315(5), F.A.C.) may be performed by any authorized representative of the construction permit applicant or supplier of water; but measurements for pH and field measurements for dissolved oxygen or turbidity shall be performed following the appropriate procedures in the Department of Environmental Protection Standard Operating Procedures for Field Activities, DEP-SOP-001/01, as incorporated into Fl. Admin. Code R. 62-160.800, and all other measurements shall be performed using an appropriate method referenced in subsection (1) above or in Standard Methods for the Examination of Water and Wastewater as adopted in Fl. Admin. Code R. 62-555.335 Measurements for residual chlorine when taking bacteriological survey or evaluation samples (see paragraphs 62-555.315(6)(b) and (c), F.A.C., and subsection 62-555.340(2), F.A.C.) may be performed by any authorized representative of the permittee, supplier of water, or Department, but shall be performed following the appropriate procedures in the Department of Environmental Protection Standard Operating Procedures for Field Activities, DEP-SOP-001/01, as incorporated into Fl. Admin. Code R. 62-160.800 Daily measurements for fluoride concentration at water treatment plants fluoridating water (see Fl. Admin. Code R. 62-555.325(3)(a)) may be performed by any authorized representative of the supplier of water but shall be performed using an appropriate method referenced in subsection (1) above. Measurements for disinfectant residual, pH, or temperature to determine compliance with the operational requirements under subsection 62-555.350(5), F.A.C., may be performed by any authorized representative of the supplier of water or Department; but measurements for residual chlorine, temperature, or pH shall be performed following the appropriate procedures in the Department of Environmental Protection Standard Operating Procedures for Field Activities, DEP-SOP-001/01, as incorporated into Fl. Admin. Code R. 62-160.800, and all other measurements shall be performed using an appropriate method referenced in subsection (1) above or in Standard Methods for the Examination of Water and Wastewater as adopted in Fl. Admin. Code R. 62-555.335
    (3) The Department may take samples and use the results to determine compliance with the applicable requirements of this chapter or Fl. Admin. Code Chapter 62-555
    (4) Compositing of Samples.
    (a) A public water system may reduce the total number of samples that must be analyzed pursuant to Rules 62-550.511, 62-550.512, 62-550.513, 62-550.515, 62-550.516, and 62-550.519, F.A.C., by the use of compositing. No more than two samples shall be combined into one composite sample when analyzing for antimony or thallium, which are listed in Table 1, or for any of the volatile organic contaminants listed in Table 4, or for ethylene dibromide (EDB), which is listed in Table 5. No more than three samples shall be combined into one composite sample when analyzing for toxaphene, which is listed in Table 5. No more than four samples shall be combined into one composite sample when analyzing for cyanide, which is listed in Table 1. No more than five samples shall be combined into one composite sample when analyzing for the other contaminants in the other groups.
    (b) Compositing shall be done only by certified laboratories using the approved methods referenced in subsection (1) above. All samples, except those taken for radionuclides, shall be analyzed within 14 days of collection.
    (c) If the population served by the system is greater than 3,300 persons, then compositing is only permitted at sampling points within a single system. For systems serving 3,300 or fewer persons, compositing among different systems is permitted provided the 5 sample limit is maintained.
    (d) Resampling After a Detection of a Contaminant in a Composite Sample.
    1. A follow-up sample shall be taken within 14 days from each source and sampling point included in the composite. Each of the samples shall be analyzed individually for the detected contaminant.
    2. If duplicates of the original sample for volatile or synthetic organic contaminants are available, the system may use these duplicates instead of resampling. If a duplicate is used, it shall be analyzed for the detected contaminant within 14 days of collection.
    (e) Compositing of no more than two samples from new wells for the purpose of obtaining clearance is allowed.
Rulemaking Authority 403.8055, 403.853(3), 403.861(9) FS. Law Implemented 403.853(1), (3), 403.861(16), (17) FS. History-New 11-19-87, Formerly 17-22.350, Amended 1-18-89, 5-7-90, 1-3-91, 1-1-93, 1-26-93, Formerly 17-550.550, Amended 9-7-94, 2-7-95, 8-1-00, 11-27-01, 4-14-03, 11-28-04, 9-18-07, 12-30-11, 7-7-15.