5 Colo. Code Regs. § 1002-11.16

Current through Register Vol. 47, No. 20, October 25, 2024

Section 5 CCR 1002-11.16 - REVISED TOTAL COLIFORM RULE

(a) The requirements of this section constitute the regulations for total coliforms and E. coli. This regulation establishes a maximum contaminant level and treatment technique requirements.

11.16(1)Applicability and Definitions

(a) All public water systems must comply with the requirements specified in this rule, unless otherwise specified.

(b) "CLEAN COMPLIANCE HISTORY" means a record of no MCL violations under 11.45(1), no sampling violations under 11.16, and no treatment technique triggers or treatment technique violations under 11.16 for a minimum of 12 months.

(c) Failure to comply with the applicable requirements of 11.16 is a violation of the Colorado Primary Drinking Water Regulations.

(d) The supplier must have the system operated by qualified personnel who meet the requirements of Regulation 100, the Water and Wastewater Facility Operators Certification Requirements.

11.16(2)Analytical Methods and Laboratory Certification

(a) Suppliers must analyze all compliance samples, required by 11.16 and 11.46(2), using a Department-certified laboratory using a certified method.

11.16(3)Sample Siting Plan Requirements

(a) As part of the monitoring plan specified in 11.5, the supplier must develop a written sample siting plan, pursuant to 11.16(4) and 11.16(5), that identifies all of the following:

(i) Sampling sites and a sample collection schedule that are representative of water throughout the distribution system. The supplier must collect total coliform samples according to the written sample siting plan. Monitoring locations may include a customer's premises, dedicated sampling station, or other designated compliance sampling site. The sample siting plan must include routine and repeat sample sites and any other sampling sites necessary to meet the requirements of 11.11.

(ii) Suppliers must identify repeat sample sites in the sample siting plan. Unless the requirements of 11.16(3)(a)(ii)(A) or 11.16(4)(a)(v)(A) are met, the supplier must collect at least one repeat total coliform sample at the site where the original total coliform-positive sample was collected, at least one repeat total coliform sample at a site within five service connections upstream from the site where the original total-coliform positive sample was collected, and at least one repeat total coliform sample at a site within five service connections downstream from the site where the original total-coliform positive sample was collected.

(A) Alternatively, suppliers may propose repeat monitoring locations to the Department that the supplier believes to be more representative of a pathway for contamination of the distribution system. A supplier may elect to:

(I) Identify alternative fixed repeat sampling sites that the supplier believes to be representative of a pathway for contamination of the distribution system; or

(II) Develop criteria for selecting repeat sampling sites on a situational basis that the supplier believes to best verify and determine the extent of potential contamination and a potential pathway for contamination of the distribution system in a standard operating procedure (SOP) that is included in the sampling plan. The Department may modify the SOP or require alternative repeat sampling sites.

(B) If the supplier collected the original total coliform-positive sample from the end of the distribution system or one site away from the end of the distribution system, the Department may allow an alternative sampling site for collecting repeat samples at the upstream or downstream sites.

(iii) The Department may review, revise, and approve the written sample siting plan, as specified in 11.16(3). The supplier must demonstrate that the sample siting plan remains representative of the water quality in the distribution system.

11.16(4)Sampling Requirements

(a) To determine compliance with the MCL for E. coli or to determine if a treatment technique is triggered, the supplier must collect total coliform samples as specified in the supplier's sample siting plan in 11.16(3) and as specified in 11.16(4) and 11.16(5).

(i) The supplier must collect total coliform samples at regular time intervals throughout the month, except:

(A) For groundwater systems that supply less than or equal to ([LESS THAN EQUAL TO]) 4,900 people, the supplier may collect all required samples on a single day if the samples are collected from different sites.

(ii) The supplier may collect more samples than the minimum number of routine total coliform samples required as specified in Table 11.16-I as a tool to investigate potential problems in the distribution system.

(A) The supplier must use these sample results to determine if a coliform treatment technique in 11.16(8)(a)(i) or 11.16(8)(a)(ii) has been triggered if the supplier collects these samples in accordance with the sample siting plan and are representative of water throughout the distribution system.

(iii) If any of the sample results collected under 11.16(4) are total coliform-positive, the supplier must comply with the repeat monitoring requirements in 11.16(5) and E. coli analytical requirements in 11.16(4)(e).

(iv) The supplier is not required to submit special purpose samples, as defined in 11.2(5)(78) unless the sample result is E. coli-positive and is representative of water in the distribution system. The supplier must submit E. coli-positive special purpose sample results to the Department as specified in 11.35(2)(a).

(v) If an E. coli MCL violation occurs under 11.16(11) or if a coliform treatment technique is triggered under 11.16(8), the supplier must still collect at least the minimum number of required samples.

(vi) For groundwater systems, the supplier must collect triggered source water monitoring samples as specified in 11.11(4) in addition to repeat samples required in 11.16(5).

(A) For a groundwater system with a single well supplying less than or equal to ([LESS THAN EQUAL TO]) 1,000 people, if the supplier is required to collect a triggered source water monitoring sample, the supplier, with written Department approval, may collect one of the repeat total coliform samples at the sample site required for triggered source water monitoring under 11.11(4), if the supplier demonstrates to the Department's satisfaction that the sample siting plan remains representative of water quality in the distribution system.

(I) If approved by the Department, the supplier may use the repeat total coliform sample to meet both the triggered source water monitoring requirements specified in 11.11(4) and the total coliform repeat sampling requirements specified in this section, 11.16(5).

(II) If the repeat sample collected from the groundwater source is E. coli-positive, the supplier must comply with the requirements in 11.11(4).

(b)Routine Sampling Requirements for Total Coliform

(i) For all public water systems, the supplier must collect the number of routine total coliform samples specified in Table 11.16-I each month except:

(A) For non-community groundwater systems that supply less than or equal to ([LESS THAN EQUAL TO]) 1,000 people, the supplier must collect one total coliform sample during each quarter that water is supplied to the public, unless the supplier is required to increase the routine sampling frequency as specified in 11.16(4)(c).

(I) In any month where the system supplies greater than (>) 1,000 people, the supplier must collect the number of routine total coliform samples specified in Table 11.16-I each month.

(a) The supplier must have written Department-approval to alternate between quarterly and monthly sampling frequencies based on when the population supplied is less than or equal to ([LESS THAN EQUAL TO]) 1,000 people or when the population supplied is greater than (>) 1,000 people.

(ii) For public water systems that haul water, the water hauler must collect at least one total coliform sample from the outlet port of each tank or container each month that the tank or container is used to supply water to the public.

(iii) For hand-pumped wells, the supplier must collect at least one total coliform sample from each hand-pumped well each month that it supplies water to the public.

(iv) For the following public water systems, the supplier is not eligible for a quarterly sampling frequency as specified in 11.16(4)(b)(i)(A):

(A) Seasonal systems.

(B) Public water systems that do not provide chemical disinfection.

(C) Public water systems that haul water.

(D) Groundwater systems with hand-pumped wells.

(v) The Department must perform a special monitoring evaluation during each sanitary survey to review the status of the system, including the distribution system, and determine whether the supplier is on an appropriate monitoring schedule.

(A) Based on the Department's special monitoring evaluation, the Department may modify the Supplier's monitoring schedule, consistent with 11.16(4) and 11.16(5)..

TABLE 11.16-I NUMBER OF ROUTINE TOTAL COLIFORM SAMPLES REQUIRED PER MONITORING PERIOD
Population supplied	Minimum number of samples required	Population supplied	Minimum number of samples required
25 to 1,0001	1	59,001 to 70,000	70
1,001 to 2,500	2	70,001 to 83,000	80
2,501 to 3,300	3	83,001 to 96,000	90
3,301 to 4,100	4	96,001 to 130,000	100
4,101 to 4,900	5	130,001 to 220,000	120
4,901 to 5,800	6	220,001 to 320,000	150
5,801 to 6,700	7	320,001 to 450,000	180
6,701 to 7,600	8	450,001 to 600,000	210
7,601 to 8,500	9	600,001 to 780,000	240
8,501 to 12,900	10	780,001 to 970,000	270
12,901 to 17,200	15	970,001 to 1,230,000	300
17,201 to 21,500	20	1,230,001 to 1,520,000	330
21,501 to 25,000	25	1,520,001 to 1,850,000	360
25,001 to 33,000	30	1,850,001 to 2,270,000	390
33,001 to 41,000	40	2,270,001 to 3,020,000	420
41,001 to 50,000	50	3,020,001 to 3,960,000	450
50,001 to 59,000	60	3,960,001 or more	480

1 Includes systems that have greater than or equal to (>=) 15 service connections, but supply less than (<) 25 people.

(c)For Non-community Groundwater Systems Supplying Less Than or Equal to ([LESS THAN EQUAL TO]) 1,000 People - Increased Routine Sampling Requirements for Total Coliform

(i) If the supplier is sampling quarterly, the supplier must increase the routine sampling frequency to monthly if any of the following events occur:

(A) The supplier triggers a Level 2 assessment or two Level 1 assessments under 11.16(8) that occur within a rolling 12-month period.

(B) A total coliform treatment technique violation occurs.

(C) Two sampling violations under 11.16occur in a rolling 12-month period.

(D) A Level 1 assessment is triggered and a sampling violation of 11.16 occurs within a rolling12-month period.

(E) The supplier receives an E. coli MCL violation.

(ii) The supplier must begin the monthly sampling frequency in the month following the month that the event occurred under 11.16(4)(c)(i).

(iii) If the supplier is sampling monthly, the Department may allow the supplier to return to a routine quarterly sampling frequency if all of the following criteria are met:

(A) Within the last 12 months, the Department or a Department-approved party has completed a sanitary survey or a Level 2 assessment.

(B) The system is free of sanitary defects and all significant deficiencies have been corrected, has a protected source water, and meets approved construction standards.

(C) The system's water source(s) is protected from the direct influence of surface water or any other source of contamination.

(D) The system has a clean compliance history for at least 12 consecutive months.

(d)For Non-community Groundwater Systems Supplying Less Than or Equal to ([LESS THAN EQUAL TO]) 1,000 People - Additional Routine Sampling Requirements in the Month Following a Total Coliform-positive Sample Result

(i) If the supplier is collecting total coliform samples on a quarterly frequency and one or more of the samples collected is total coliform-positive (with or without a Level 1 treatment technique trigger), the supplier must collect at least three additional routine samples during the following month.

(A) The supplier may either collect the samples at regular time intervals throughout the month or collect all required additional routine samples on a single day if the samples are collected from different sites.

(ii) If any of the additional routine sample results are total coliform-positive, the supplier must collect repeat samples as specified in 11.16(5).

(iii) The supplier must use the results of additional routine samples to determine whether an E. coli MCL violation of 11.16(10) has occurred or if a treatment technique requirement is triggered under 11.16(9).

(iv) If all three additional routine samples are total coliform-negative, the supplier may return to collecting one total coliform sample on a quarterly sampling frequency. The supplier must begin collecting the quarterly sampling frequency in the calendar quarter following the month that the three additional routine samples were required.

(e) If any routine or repeat sample result is total coliform-positive, the supplier must have a laboratory analyze the total coliform-positive culture medium to determine if E. coli are present.

(i) If any routine sample under 11.16(4), repeat sample under 11.16(5), or special purpose sample result under 11.3(78) is E. coli-positive, the supplier must notify the Department no later than the end of the day that the supplier is notified of the sample result.

(A) If the supplier is notified of the sample result after the Department is closed, the supplier must contact the Department's after-hours phone line.

(f) If any routine sample collected under 11.16(4) is total coliform-positive, the supplier must comply with the repeat monitoring requirements in 11.16(5).

11.16(5)Repeat Sampling Requirements for Total Coliform

(a) For each routine sample result collected under 11.16(4) that is total coliform-positive, the supplier must collect a sample set of at least three repeat total coliform samples no later than 24 hours after being notified of the positive sample result.

(i) If the supplier has a logistical problem beyond their control that prevents the supplier from collecting the repeat samples within the 24-hour limit, the Department may extend the 24hour limit on a case-by-case basis.

(A) If the Department grants the extension, the Department shall specify how much time the supplier has to collect the repeat samples.

(ii) The Department shall not waive the requirement to collect repeat samples.

(b) The supplier must collect repeat samples in accordance with the written sample siting plan required under 11.16(3).

(c) The supplier must collect all repeat samples on the same day.

(i) If the system has only one service connection, the Department may allow the supplier to collect a larger volume repeat sample(s) in one or more sample containers of any size, as long as the total volume collected is at least 300 ml.

(d) If a treatment technique is triggered based only on routine sample results, the supplier is required to collect only one repeat sample set for each routine total coliform-positive routine sample, collected under 11.16(4), and is not required to comply with the requirements specified in 11.16(5)(e).

(e) If one or more of the repeat sample results is total coliform-positive, the supplier must:

(i) Collect an additional repeat sample set as specified in 11.16(5)(a-d) for each site that had a total coliform-positive sample result.

(A) The additional repeat sample set(s) must be collected no later than 24 hours after being notified of the total coliform-positive sample result(s), unless the Department extends the 24-hour limit as specified in 11.16(5)(a)(i).

(ii) Continue to collect additional repeat sample sets as specified in 11.16(5)(e)(i) until either:

(A) Total coliforms are not detected in one complete repeat sample set; or

(B) A treatment technique is triggered as specified in 11.16(8) based on total coliform-positive repeat sample results and the supplier has notified the Department.

(iii) If a trigger under 11.16(8) is exceeded as a result of a total coliform-positive routine sample, the supplier is required to conduct only one round of repeat monitoring for each total coliform-positive routine sample.

(f) If the supplier collects a routine sample, which after analysis is found to be total coliform-positive, but before receiving that sample result the supplier collects another routine sample within five service connections of the original sample, the supplier may use the subsequent routine sample as a repeat sample instead of as a routine sample.

(g) Results of all routine and repeat samples collected under 11.16(4) and or 11.16(5) not invalidated by the Department under 11.16(7) must be used to determine if a coliform treatment technique is triggered under 11.16(8).

11.16(6)Additional Requirements for Seasonal Systems

(a) The supplier must complete Department-approved start-up procedures and certify that the startup procedures were completed before supplying water to the public each season.

(i) No later than the 10th of the month following the month that the system began supplying water to the public, the supplier must submit the certification that start-up procedures were completed.

(b) The supplier must either submit start-up procedures for Department approval or use the pre-approved procedures in the Department's Revised Total Coliform Rule Start-up Procedures for Seasonal Systems Handbook.

(c) As part of the start-up procedures, the supplier must collect a total coliform sample in the distribution system before supplying water to the public.

(d) All seasonal systems are required to collect monthly total coliform samples, pursuant to 11.16(4), during the operating season according to Table 11.16-I.

11.16(7)Invalidation of Total Coliform Samples

(a) A total coliform-positive sample result invalidated under 11.16(7) does not count towards meeting the minimum reporting requirements of 11.16.

(b) The Department may invalidate a total coliform-positive sample result only if one or more of the following conditions are met:

(i) The laboratory establishes that improper sample analysis caused the total coliform-

positive sample result.

(ii) Based on repeat sample results collected under 11.16(5), the Department determines that the total coliform-positive sample resulted from a domestic or other non-distribution system plumbing problem that is limited to the specific service connection from which the total coliform sample was collected. The Department shall not invalidate a total coliform-positive sample result on the basis of repeat sample results unless all repeat sample(s) collected at the same site as the original total coliform-positive sample are also total coliform-positive, and all repeat samples collected at a site other than the original site are total coliform-negative. The Department shall not invalidate a total coliform-positive sample result solely on the basis that all repeat sample results are total coliform-negative, or if the system has only one service connection.

(iii) The Department has substantial grounds to believe that a total coliform-positive sample result was due to a circumstance or condition that does not reflect water quality in the distribution system. If the Department makes this determination, the supplier must still collect the required number of repeat samples under 11.16(5) and use them to determine if a treatment technique is triggered as specified in 11.16(8). The Department must document the decision and supporting rationale for invalidating a total coliform-positive sample result in writing, have it approved and signed by a supervisor of the Department official who recommended the decision, and make this document available to the EPA and the public. The written documentation must state the specific cause of the total coliform-positive sample result and what action the supplier has taken, or will take, to correct the problem. The Department shall not invalidate a total coliform-positive sample result solely on the basis that all repeat sample results are total coliform-negative.

(iv) The laboratory shall invalidate a total coliform sample result (unless total coliforms are detected) if the sample produces a turbid culture in the absence of gas production using an analytical method where gas formation is examined (e.g., the Multiple-Tube Fermentation Technique), the sample produces a turbid culture in the absence of an acid reaction in the Presence-Absence (P-A) Coliform Test, or the sample exhibits confluent growth or produces colonies too numerous to count with an analytical method using a membrane filter (e.g., Membrane Filter Technique). If the laboratory invalidates a sample result because of such interferences, the supplier must collect a replacement total coliform sample from the same site as the invalidated sample no later than 24 hours after being notified of the invalidation, and have it analyzed for the presence of total coliforms. The supplier must continue to re-sample within 24 hours and have the samples analyzed for the presence of total coliforms until the supplier obtains a valid result. The Department may extend the 24-hour limit on a case-by-case basis.

(A) "CONFLUENT GROWTH" means, in the context of bacterial testing, a continuous bacterial growth covering the entire filtration area of a membrane filter, or a portion thereof, in which bacterial colonies are not discrete.

(B) "TOO NUMEROUS TO COUNT" means that the total number of bacterial colonies exceeds 200 on a 47-millimeter (mm) diameter membrane filter used for coliform detection.

11.16(8)Total Coliform Treatment Technique Triggers

(a) The treatment technique triggers for a Level 1 assessment are as follows:

(i) If the supplier collects greater than or equal to (>=) 40 samples per month, more than 5.0

percent of the samples collected for the month are total coliform-positive.

(ii) If the supplier collects less than (<) 40 samples per month, two or more samples collected for the monitoring period are total coliform-positive.

(iii) The supplier fails to collect all required repeat samples after any single total coliform-positive sample.

(b) The treatment technique triggers for a Level 2 assessment are as follows:

(i) An E. coli MCL violation occurs as specified in 11.16(11)(a).

(ii) A second treatment technique trigger for a Level 1 assessment, as specified in 11.16(8)(a), occurred within 12 consecutive months, except:

(A) If the Department has determined the likely reason(s) for the total coliform-positive sample(s) that caused the first Level 1 assessment to be triggered and the Department has established that the supplier has corrected the problem(s).

11.16(9)Treatment Technique Requirements: Level 1 and Level 2 Assessment

(a) Once all of the monitoring required by 11.16(4) and or 11.16(5) has been completed, the supplier must determine if any treatment technique has been triggered as specified in 11.16(8). If at any time a treatment technique trigger has been exceeded, the supplier must complete the assessments as required by 11.16(9).

(b)General Requirements for Assessments

(i) To identify the possible presence of sanitary defects and defects in distribution system coliform sampling practices, the supplier must ensure that a Level 1 or Level 2 assessment is conducted.

(ii) The supplier must ensure that the assessor evaluates at least all of the following elements:

(A) Inadequacies in sample sites.

(B) Inadequacies in sampling protocol.

(C) Inadequacies in sample processing.

(D) Atypical events that could affect distributed water quality or indicate that distributed water quality was impaired.

(E) Changes in distribution system maintenance and operation, including water storage, that could affect distributed water quality.

(F) Source and treatment considerations that affect distributed water quality.

(G) Existing water quality monitoring data.

(iii) The supplier or the Department may request a consultation with the other party at any time during the assessment or corrective action phase. The consultation may be used to determine appropriate actions to be taken or to discuss relevant information that may impact the supplier's ability to comply with the requirements specified in 11.16(9).

(iv) If required by the Department, the supplier must ensure that the assessment is conducted consistent with any Department-specified modifications to assessment elements based on the size and type of the system and the size, type, and characteristics of the distribution system.

(v) The supplier must correct sanitary defects found through either Level 1 or Level 2

assessments, pursuant to 11.16(9)(b)(ii). If the supplier has not completed corrective action for any sanitary defect before the submission of the assessment form, the supplier, in consultation with the Department, must complete the corrective action(s) on a Department-approved schedule. The supplier must notify the Department when each scheduled corrective action is completed.

(c)Level 1 Assessments

(i) If any treatment technique for a Level 1 assessment is triggered under 11.16(8)(a), the supplier must complete a Level 1 assessment, consistent with Department requirements, as soon as practical.

(ii) No later than 30 days after learning of a treatment technique trigger for a Level 1

assessment, the supplier must submit for review a completed Level 1 assessment form. In the completed form, the supplier must state whether sanitary defects were identified and if so, describe all of the following:

(A) Sanitary defects identified.

(B) The likely reason(s) for the treatment technique trigger.

(C) If sanitary defects are identified, corrective actions completed.

(D) If sanitary defects are identified, a proposed schedule for any corrective actions not already completed.

(E) The assessment form may also indicate that no sanitary defects were found.

(iii) If the Department reviews the Level 1 assessment form and determines that the assessment is not sufficient or the assessment form is not complete (including any proposed schedule for any corrective actions not already completed), the Department shall consult with the supplier. If the Department requires revisions after consultation, the supplier must submit a revised assessment form to the Department on an agreed-upon date no later than 30 days from the date of the consultation.

(iv) Upon completion and submission of the assessment form by the supplier, the

Department shall determine if the supplier identified the likely reason(s) for the Level 1 trigger. If the supplier identified the likely reason(s) for the treatment technique trigger, the Department shall determine if the supplier corrected the problem or included a Department-approved schedule for correcting the problem.

(d)Level 2 Assessments

(i) If any treatment technique for a Level 2 assessment is triggered under 11.16(8)(b), the supplier must ensure that a Level 2 assessment is conducted as soon as practical. The supplier must ensure that the Level 2 assessment, consistent with Department requirements, is completed by the Department or Department-approved party.

(ii) The supplier must comply with any expedited actions or additional actions required by the

Department in the case of an E. coli violation.

(iii) No later than 30 days after learning of a Level 2 treatment technique trigger exceedance, the supplier must submit for review a completed Level 2 assessment form. The supplier must state whether sanitary defects were identified and if so, describe all of the following:

(A) Sanitary defects identified.

(B) The likely reason(s) for the Level 2 treatment technique trigger.

(C) If sanitary defects are identified, corrective actions completed.

(D) If sanitary defects are identified, a proposed schedule for any corrective actions not already completed.

(E) The assessment form may also indicate that no sanitary defects were found.

(iv) If the Department reviews the Level 2 assessment form and determines that the assessment was not sufficient or the assessment form is not complete (including any proposed schedule for any corrective actions not already completed), the Department shall consult with the supplier. If the Department requires revisions after consultation, the supplier must submit a revised assessment form to the Department on an agreed-upon schedule no later than 30 days from the date of the consultation.

(v) Upon completion and submission of the assessment form by the supplier, the Department shall determine if the supplier identified the likely reason(s) for the Level 2 treatment technique trigger. If the supplier identified the likely reason(s) for the treatment technique trigger, the Department shall determine if the supplier corrected the problem or included a Department-approved schedule for correcting the problem.

11.16(10)Compliance Determination for the E. coli MCL

(a) To determine if an E. coli MCL violation has occurred, the supplier must include the results of all routine and repeat samples collected in the monitoring period under 11.16(4) and 11.16(5).

(b) The BATs for achieving compliance with the E. coli MCL are specified in 40 CFR 141.63(e-f).

11.16(11)Violations

(a) The following constitute E. coli MCL violations, pursuant to 11.45(1) and Table 11.45-I:

(i) A repeat sample is E. coli-positive following a total coliform-positive routine sample.

(ii) A repeat sample is total coliform-positive following an E. coli-positive routine sample.

(iii) The supplier fails to collect all required repeat samples following an E. coli-positive routine sample.

(iv) The supplier fails to analyze a total coliform-positive repeat sample for E. coli.

(v) If a repeat sample collected at the monitoring location for triggered source water monitoring is E. coli-positive. The supplier must also comply with 11.11(4)(d). If a supplier collects more than one repeat sample at the monitoring location for triggered source water monitoring, the supplier may reduce the number of additional source water samples required under 11.11(4) by the number of repeat samples collected at that location that were not E. coli-positive.

(vi) If a supplier collects more than one repeat sample at the triggered source water monitoring location under 11.11(4), and more than one repeat sample is E. coli-positive, the supplier has violated the E. coli MCL and must also comply with 11.11(6).

(vii) If all of the repeat samples collected at the triggered source water monitoring location are E. coli negative and a repeat sample collected other than the one for triggered source water monitoring is E. coli-positive, the supplier has violated the E. coli MCL under 11.16(11)(a) and the supplier is not required to comply with 11.11(4)(d).

(b) The following constitute treatment technique violations:

(i) A treatment technique was triggered under 11.16(8) and the supplier failed to conduct the required assessment or corrective action(s) within the timeframe as specified in 11.16(9).

(ii) For seasonal systems, the supplier fails to complete Department-approved start-up procedures before supplying water to the public.

(c) The following constitute monitoring violations:

(i) Failure to collect every required routine or additional routine sample in the supplier's compliance period.

(ii) Failure to analyze for E. coli following a total coliform-positive routine sample.

(d) The following constitute reporting violations:

(i) Failure to submit monitoring results or a completed assessment form after a supplier conducts the required monitoring or assessment in a timely manner.

(ii) Failure to notify the Department following an E. coli-positive sample as required by 11.16(4)(e)(i) in a timely manner.

(iii) For seasonal systems, failure to submit certification of completion of Department-approved start-up procedures.

11.16(12)Reporting Requirements

(a) In the event of an E. coli MCL violation, the supplier must:

(i) Notify the Department no later than the end of the day that the supplier learns of the violation. If the supplier learns of the violation after the Department is closed, the supplier must contact the Department's 24 Hour Environmental Release/Incident report line (i.e., after-hours phone line).

(ii) Distribute Tier 1 public notice as specified in 11.33.

(b) In the event of a coliform treatment technique violation under 11.16(11)(b), the supplier must:

(i) Notify the Department no later than the end of the next business day after the supplier learns of the violation.

(ii) Distribute Tier 2 public notice as specified in 11.33.

(c) In the event of an E. coli-positive routine or repeat sample event, the supplier must notify the Department no later than the end of the day when the supplier is notified. If the supplier learns of the violation after the Department is closed, the Supplier must contact the Department's 24 Hour Environmental Release/Incident report line (i.e., after-hours phone line).

(d) A supplier required to conduct an assessment under 11.16(9) must submit the assessment report within 30 days. The supplier must notify the Department, in accordance with 11.16(9)(c)(iv) or 11.16(9)(d)(v), when each scheduled corrective action is completed for corrections not completed at the time of submission of the assessment form.

(e) In the event of a coliform monitoring violation, the supplier must:

(i) Notify the Department within 10 days after the system discovers the violation.

(ii) Conduct Tier 3 public notice as specified in 11.33.

(f) No later than the 10^th of the month following the month that the seasonal system began supplying water to the public, the supplier must submit certification that start-up procedures were completed.

5 CCR 1002-11.16

38 CR 07, April 10, 2015, effective 4/30/2015

41 CR 11, June 10, 2018, effective 6/30/2018

41 CR 23, December 10, 2018, effective 12/30/2018

43 CR 07, April 10, 2020, effective 4/30/2020

43 CR 17, September 10, 2020, effective 9/30/2020

45 CR 24, December 25, 2022, effective 1/14/2023