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-.05 - Volatile Synthetic Organic Chemicals (VOCs) Standards and Monitoring Requirements

Current through Register Vol. 42, No. 9, June 28, 2024
(1) The
				following are the MCLs for VOCs:
CONTAMINANT
MCL (mg/L)
Benzene
0.005
Carbon Tetrachloride
0.005
1,2-dichloroethane
0.005
Trichloroethylene
0.005
para-dichlorobenzene
0.075
1,1-dichloroethylene
0.007
1,1,1-trichloroethane
0.2
Vinyl chloride
0.002
cis-1,2-Dichloroethylene
0.07
1,2-Dichloropropane
0.005
Ethylbenzene
0.7
Monochlorobenzene
0.1
O-Dichlorobenzene
0.6
Styrene
0.1
Tetrachloroethylene
0.005
Toluene
1
Trans-1,2-Dichloroethylene
0.1
Xylene (Total)
10
Dichloromethane
0.005
1,2,4-Trichlorobenzene
0.07
1,1,2-Trichloroethane
0.005
(2)
				The following are the monitoring requirements for VOCs :
(a) Community and NTNC water systems shall
				analyze for each VOC during each three year monitoring period if no regulated
				VOC has been detected in the past. Samples shall be collected during periods of
				normal operating conditions from the entry point to the distribution system
				representing each source of water used after any application of treatment. Raw
				water analysis may be used to determine compliance if no treatment processes
				are used for the reduction of VOCs.
(b) Community and NTNC water systems shall
				sample all new sources for VOCs for four consecutive quarters. The system may
				apply for a waiver for the new source after two quarters of monitoring for any
				VOC which has not been detected above the monitoring trigger.
(c) Community and NTNC water systems using
				water from more than one source and blending prior to the entry point to the
				distribution system must sample at the entry point to the distribution system
				during periods of normal operating conditions. Sampling of raw water from each
				source may be required if a contaminant is detected.
(d) Confirmation samples may be required by
				the Department to confirm a negative or positive result. Confirmation samples
				must be collected from a point representing the source and unless investigation
				proves initial samples were contaminated because of conditions at the sampling
				site or sampling procedures, the confirmation results will be averaged with the
				initial results to determine compliance.
(e) Community and NTNC water systems may
				apply to the Department for a waiver from monitoring VOCs. Issuance of the
				waiver shall be based on established vulnerability criteria, results of water
				analysis and a demonstration by the system of no use, transport, storage or
				disposal in the watershed or Source Water Assessment Areas I and II. The
				waiver, if granted, shall be in effect for two compliance periods and the
				system must reapply for the waiver every two compliance periods. A system must
				collect one sample at each sampling point for a VOC analysis during the time
				frame the waiver is in effect and update the vulnerability assessment within
				three years after the waiver is granted.
(f) The Department may require analysis of
				VOCs during a specific quarter of the year.
(g) The Department has the authority to
				determine compliance based on analytical results and other information compiled
				by Department staff.
(h) Non
				compliance with any regulated VOC MCL will occur when:
1. For systems monitoring more than once per
				year, compliance with the MCL is determined by a running annual average at each
				sampling point.
2. Any sample
				analysis exceeds the MCL, if monitoring is being conducted annually or less
				frequently.
3. Upon exceeding the
				MCL, the system must establish a treatment process using the EPA approved best
				available technology to achieve compliance with the MCL or phase out using the
				source of supply in conjunction with a Department-issued compliance
				schedule.
4. If one sampling point
				is in violation of an MCL, the system is in violation of the MCL.
(i) Repeat samples must be
				analyzed after initial sampling has been completed according to the following
				schedule:
1. Community and NTNC water systems
				shall monitor for VOCs annually if no regulated VOCs are detected above the
				monitoring trigger in the initial compliance monitoring.
2. Monitoring may be reduced to one sample
				per compliance period for ground water systems if no regulated VOCs are
				detected above the monitoring trigger after a minimum of three years of annual
				sampling.
3. Monitoring may be
				reduced to one sample per compliance period for surface water systems if no
				regulated VOCs are detected above the monitoring trigger after a minimum of
				three years of annual sampling and the system is determined to be
				non-vulnerable according to previously approved EPA criteria.
4. If a regulated VOC is detected above the
				monitoring trigger, community and NTNC water systems must monitor quarterly for
				VOCs. The system will not be considered in violation of the MCL until it has
				completed one year of quarterly sampling.
5. Monitoring may be reduced to annually if
				the average of all analytical results within the past two years is less than
				one-half of the MCL and no analytical result within the past two years exceeds
				75% of the MCL. Groundwater systems shall analyze a minimum of two quarterly
				samples and surface water systems a minimum of four quarterly
				samples.
6. Community and NTNC
				water systems which exceed the MCL for a regulated VOC shall analyze quarterly
				for that contaminant beginning in the next quarter after the violation
				occurred. Sampling may be reduced to annually if the average of all analytical
				results within the past two years is less than one-half of the MCL and no
				analytical result within the past two years exceeds 75% of the MCL. All
				community and NTNC water systems must analyze a minimum of four quarterly
				samples.
7. Community and NTNC
				water systems which have three consecutive annual sample results with no
				detection of a regulated volatile organic chemical may apply to the Department
				for a waiver according to the criteria listed in this chapter.
8. All repeat samples shall be collected at
				the sampling point where detection occurred.
9. Systems which have detected one or more of
				the following two-carbon organic compounds: trichloroethylene,
				tetrachloroethylene, 1,2 dichloroethane, 1,1,1-trichloroethane, cis-1,2
				dichloroethylene, trans-1,2-dichloroethylene, or 1,1-dichloroethylene shall
				monitor quarterly for vinyl chloride. A vinyl chloride sample shall be taken at
				each sampling point at which one or more of the two-carbon organic compounds
				were detected. If the results of the first analysis do not detect vinyl
				chloride, the system shall collect one sample during each compliance
				period.
(j) Consecutive
				systems which obtain all of their water from a public water system are exempt
				from monitoring for the regulated VOCs.
(k) If a system fails to collect the required
				number of samples, compliance will be based on the total number of samples
				collected.
(l) If a sample result
				is less than the detection limit, zero will be used to calculate the annual
				average.