Alabama Administrative Code › Title 335 - ALABAMA DEPARTMENT OF ENVIRONMENTAL MANAGEMENT › WATER DIVISION - WATER SUPPLY PROGRAM › Chapter 335-7-11 - CONTROL OF LEAD AND COPPER › Section 335-7-11-.14 - Corrosion Control Parameter Monitoring Requirements

Current through Register Vol. 42, No. 9, June 28, 2024
(1) All large water systems and water systems
				utilizing a corrosion control process to meet the requirements established
				under rule
				335-7-11-.12 shall begin
				monitoring within ten days of process activation.
(2) Monitoring parameters will be determined
				for each specific water system and may include requirements for monitoring pH,
				alkalinity, orthophosphate, silica, calcium, conductivity, water temperature,
				and other parameters designated by the Department. Compliance may be
				demonstrated by monitoring the treated water from each individual source for
				designated parameters on a daily and weekly basis or by establishing
				distribution system locations and monitoring during six-month monitoring
				periods (January - June or July - December). Compliance monitoring shall begin
				with the next full six-month period.
(a)
				Systems using the Baylis Curve may demonstrate proper corrosion control by
				monitoring the treated water from each water source on a daily basis for pH and
				total alkalinity. Should the system utilize the Langelier Index or Ryznar Index
				for evaluating the corrosive level of the water, the treated water from each
				source must be monitored for pH and alkalinity daily and calcium, water
				temperature, and hardness on a weekly basis. Should an orthophosphate or
				silicate inhibitor be used, the system shall monitor pH on a daily basis and
				the phosphate or silicate level on a weekly basis for each treatment
				facility.
(b) With the approval of
				the Department, a system may select representative sites throughout the
				distribution system, taking into consideration the number of different sources
				of water, different treatment methods, seasonal variability, and density of
				service. The number of sites must be no less than those designated in Table
				11-2.
TABLE 11-2
Water Quality Monitoring
System Size (population)
Number of sites
greater than 100,000
25
10,001-100,000
10
3301-10,000
3
501-3300
2
25-500
1
(c)
				Two samples shall be obtained from each of the designated sites and two samples
				shall be obtained from each entry point from a treatment facility operating
				under normal conditions and analyzed for pH, alkalinity, orthophosphate, (when
				a phosphate compound is used), silica (when a silicate compound is used),
				calcium, conductivity, and water temperature. These samples shall be collected
				each six-month monitoring period and reported by the 10th of the following
				month after samples are collected.
(d) All systems optimizing corrosion control
				shall continue to operate and maintain optimal corrosion control treatment,
				including maintaining water quality parameters at or above minimum values or
				within ranges designated by the State for all monitoring conducted. Compliance
				with the requirements of this subparagraph shall be determined every six
				months. A water system is out of compliance for a six-month period if it has
				excursions for any State-specified parameter on more than nine days during the
				period. An excursion occurs whenever the daily value for one or more of the
				water quality parameters measured at a monitoring location is below the minimum
				value or outside the range designated by the State. Daily values are calculated
				as follows:
1. On days when more than one
				measurement for the water quality parameter is collected at the monitoring
				location, the daily value shall be the average of all results collected during
				the day regardless of whether they are collected through continuous monitoring,
				grab monitoring, or a combination of both.
2. On days when only one measurement for the
				water quality parameter is collected at the monitoring location, the daily
				value shall be the result of that measurement.
3. On days when no measurement is collected
				for the water quality parameter at the monitoring location, the daily value
				shall be the daily value calculated on the most recent day on which the water
				quality parameter was measured at the site.