Alabama Administrative Code › Title 335 - ALABAMA DEPARTMENT OF ENVIRONMENTAL MANAGEMENT › WATER DIVISION - WATER SUPPLY PROGRAM › Chapter 335-7-2 - PRIMARY DRINKING WATER STANDARDS › Section 335-7-2-.15 - System Specific Study

Current through Register Vol. 42, No. 9, June 28, 2024
(1) A
				system specific study plan must be based on either existing monitoring results
				as required under subparagraph (1)(a) of this rule or modeling as required
				under subparagraph (1)(b) of this rule. The system specific study plan must be
				submitted to the Department according to the schedule in paragraph
				335-7-2-.13(c).
(a) Systems may comply by submitting
				monitoring results collected before the system is required to begin monitoring
				under paragraph
				335-7-2-.13(c).
				The monitoring results must meet the following criteria:
1. TTHM and HAA5 results must be based on
				samples collected and analyzed in accordance with EPA approved procedures.
				Samples must be collected no earlier than five years prior to the study plan
				submission date.
2. The monitoring
				locations and frequency must meet the conditions identified in this
				subparagraph. Each location must be sampled once during the peak historical
				month for TTHM levels or HAA5 levels or the month with the warmest water
				temperature for every 12 months of data submitted for that location. Monitoring
				results must include all monitoring conducted under rules
				335-7-2-.11 or
				335-7-2-.12 plus additional
				monitoring results as necessary to meet the minimum sample requirements listed
				in the following table.
Minimum Sample Requirements
Source Water Type
System Population
Number of Monitoring Locations
Number of Samples
TTHM
HAA5
Surface Water or
Ground Water
Under the
Influence of
Surface Water
= 3,300
3
18
18
3,301-9,999
6
36
36
10,000-49,999
12
72
72
50,000-249,999
24
144
144
250,000-999,999
36
216
216
1,000,000-4,999,999
48
288
288
= 5,000,000
60
360
360
Ground Water
< 500
3
3
3
500-9,999
3
9
9
10,000-99,999
12
48
48
100,000-499,999
18
72
72
= 500,000
24
96
96
3.
				In addition to the minimum number of samples in the table above, one sample
				must be taken at a maximum residence time representing each source of water.
				Wells in the same aquifer may be reduced to one sample at a maximum residence
				time with Department approval.
4.
				Systems must report the following information when submitting monitoring
				results.
(i) Previously collected monitoring
				results and certify that the reported monitoring results include all compliance
				and non-compliance results generated during the time period beginning with the
				first reported result and ending with the most recent monitoring result
				conducted under rules
				335-7-2-.11 or
				335-7-2-.12.
(ii) Certify that the samples were
				representative of the entire distribution system and that treatment, and the
				distribution system have not changed significantly since the samples were
				collected.
(iii) Schematic of the
				distribution system (including distribution system entry points and their
				sources, and storage facilities), with notes indicating the locations and dates
				of all completed or planned system specific study monitoring.
(iv) Population served and system type
				(surface, ground water under the influence of surface water, or ground
				water).
(v) A complete copy of the
				system specific study plan including any modifications by the Department must
				be retained for 10 years.
(vi) If
				the system submits previously collected data that fully meet the number of
				samples required under subparagraph (1)(a)2. of this rule and the Department
				rejects some of the data, the system must conduct additional monitoring to
				replace the rejected data on a schedule approved by the Department or conduct a
				standard monitoring plan.