HAR §11-20-50. (C) Additional requirements

If the State does not require corrective action under subsection (d)(1)(B) for an E. coli-positive source water sample collected under subparagraph (B) that is not invalidated under paragraph (4), the system must collect five additional source water samples from the same source within 24 hours of being notified of the E. coli-positive sample. (D) Consecutive and Wholesale Systems. (i) In addition to the other requirements of this paragraph, a consecutive ground water system that has a total coliform-positive sample collected under section 11-20-9.1(d) beginning April 1, 2016, must notify the wholesale system(s) within 24 hours of being notified of the total coliform-positive sample. (ii) In addition to the other requirements of this paragraph, a wholesale ground water system that receives notice from a consecutive system it serves that a sample collected under section 11-20-9.1(d) beginning April 1, 2016, is total coliform-positive must, within 24 hours of being notified, collect a sample from its ground water source(s) under subparagraph (B) and analyze it for E. coli under paragraph (3). If the collected source water sample is E. coli-positive, the wholesale ground water system must notify all consecutive systems served by that ground water source of the E. coli source water positive within 24 hours of being notified of the 20-329 3376 图 §11-20-50 ground water source sampling monitoring result and must meet the requirements of subparagraph (C). (E) Exceptions to the Triggered Source Water Monitoring Requirements. A ground water system is not required to comply with the source water monitoring requirements of paragraph (1) if either of the following conditions exists: (i) The State determines, and documents in writing, that the total coliform-positive sample collected under section 11-20- 9.1(d) beginning April 1, 2016, is caused by a distribution system deficiency; or (ii) The total coliform-positive sample collected under section 11-20- 9.1(d) beginning April 1, 2016, is collected at a location that meets State criteria for distribution system conditions that will cause total coliform-positive samples. (2) Assessment Source Water Monitoring. If directed by the State, ground water systems must conduct assessment source water monitoring that meets state-determined requirements for such monitoring. A ground water system conducting assessment source water monitoring may use a triggered source water sample collected under paragraph (1)(B) to meet the requirements of this paragraph. State-determined assessment source water monitoring requirements may include: (A) Collection of a total of 12 ground water source samples that represent each month the system provides ground water to the public, (B) Collection of samples from each well unless the system obtains written state 20-330 B376 §11-20-50 approval to conduct monitoring at one or more wells within the ground water system that are representative of multiple wells used by that system and that draw water from the same hydrogeologic setting, (C) Collection of a standard sample volume of at least 100 mL for E. coli analysis regardless of the analytical method used, (D) Analysis of all ground water source samples using one of the analytical methods listed in paragraph (3)(B) for the presence of E. coli, (E) Collection of ground water source samples at a location prior to any treatment of the ground water source unless the State approves a sampling location after treatment, and (F) Collection of ground water source samples at the well itself unless the system's configuration does not allow for sampling at the well itself and the State approves an alternative sampling location that is representative of the water quality of that well. (3) Analytical methods. (A) A ground water system subject to the source water monitoring requirements of paragraph (1) must collect a standard sample volume of at least 100 mL for E. coli analysis regardless of the analytical method used. (B) A ground water system must analyze all ground water source samples collected under paragraph (1) using one of the analytical methods listed in the following table for the presence of E. coli or one of the alternative methods listed in Appendix A to Subpart C, 40 C.F.R. Part 141: 20-331 3376 §11-20-50 | Analytical Methods for Source Water Monitoring | | | | --- | --- | --- | | Fecal indicator^{1} | Methodology | Method citation | | *E. coli* | Colilert^{3} | 9223 B.^{2} | | | Colisure^{3} | 9223 B.^{2} | | | Membrane Filter Method with MI Agar | EPA Method 1604.^{4} | | | m-ColiBlue24 Test^{5} | | | | E*Colite Test^{6} | | | | EC-MUG^{7} | | | | NA-MUG^{7} | 9221 F.^{2} 9221 G.^{2} | Analyses must be conducted in accordance with the documents listed below. The Director of the Federal Register approves the incorporation by reference of the documents listed in footnotes 2-7 in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies of the documents may be obtained from the sources listed below. Copies may be inspected at EPA's Drinking Water Docket, EPA West, 1301 Constitution Avenue, NW., EPA West, Room B102, Washington DC 20460 (Telephone: 202-566-2426); or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html. $^{1}$ The time from sample collection to initiation of analysis may not exceed 30 hours. The ground water system is encouraged but is not required to hold samples below 10°C during transit. $^{2}$ Methods are described in Standard Methods for the Examination of Water and Wastewater 20th edition (1998) and copies may be obtained from the American Public Health Association, 1015 Fifteenth Street, NW., Washington, DC 20005-2605. $^{3}$ Medium is available through IDEXX Laboratories, Inc., One IDEXX Drive, Westbrook, Maine 04092. $^{4}$ EPA Method 1604: Total Coliforms and Escherichia coli in Water by Membrane Filtration Using a 20-332 3376 图 §11-20-50 Simultaneous Detection Technique (MI Medium); September 2002, EPA 821-R-02-024. Method is available at http://www.epa.gov/nerlcwww/1604sp02.pdf or from EPA's Water Resource Center (RC-4100T), 1200 Pennsylvania Avenue, NW., Washington, DC 20460. 5 A description of the m-ColiBlue24 Test, "Total Coliforms and E. coli Membrane Filtration Method with m-ColiBlue24® Broth," Method No. 10029 Revision 2, August 17, 1999, is available from Hach Company, 100 Dayton Ave., Ames, IA 50010 or from EPA's Water Resource Center (RC-4100T), 1200 Pennsylvania Avenue, NW., Washington, DC 20460. 6 A description of the E*Colite Test, "Charm E*Colite Presence/Absence Test for Detection and Identification of Coliform Bacteria and Escherichia coli in Drinking Water, January 9, 1998, is available from Charm Sciences, Inc., 659 Andover St., Lawrence, MA 01843- 1032 or from EPA's Water Resource Center (RC-4100T), 1200 Pennsylvania Avenue, NW., Washington, DC 20460. 7 EC-MUG (Method 9221F) or NA-MUG (Method 9222G) can be used for E. coli testing step as described in section 11-20-9(h)(6)(A) or section 11-20-9(h)(6)(B) after use of Standard Methods 9221 B, 9221 D, 9222 B or 9222 C. (4) Invalidation of an E. coli-positive ground water source sample. (A) A ground water system may obtain State invalidation of an E. coli-positive ground water source sample collected under paragraph (1) only under the following conditions: (i) The system provides the State with written notice from the laboratory that improper sample analysis occurred; or (ii) The State determines and documents in writing that there is substantial evidence that an E. coli-positive ground water source 20-333 3376 §11-20-50 sample is not related to source water quality. (B) If the State invalidates an E. coli- positive ground water source sample, the ground water system must collect another source water sample under paragraph (1) within 24 hours of being notified by the State of its invalidation decision and have it analyzed for the E. coli using the analytical methods in paragraph (3). The State may extend the 24-hour time limit on a case-by-case basis if the system cannot collect the source water sample within 24 hours due to circumstances beyond its control. In the case of an extension, the State must specify how much time the system has to collect the sample. (5) Sampling location. (A) Any ground water source sample required under paragraph (1) must be collected at a location prior to any treatment of the ground water source unless the State approves a sampling location after treatment. (B) If the system's configuration does not allow for sampling at the well itself, the system may collect a sample at a state-approved location to meet the requirements of paragraph (1) if the sample is representative of the water quality of that well. (6) New Sources. If directed by the State, a ground water system that places a new ground water source into service after November 30, 2009, must conduct assessment source water monitoring under paragraph (2). If directed by the State, the system must begin monitoring before the ground water source is used to provide water to the public. 20-334 3376