Md. Code Regs. 26.04.01.15-1

Current through Register Vol. 51, No. 24, December 2, 2024

Section 26.04.01.15-1 - Synthetic Organic Chemical (SOC) Sampling and Analytical Requirements

A. Monitoring for the purpose of determining compliance with Regulation .07E of this chapter shall be conducted by the supplier of water to a community or nontransient noncommunity water system in accordance with the requirements of 40 CFR § 141.24(h)(1) -(3), which is incorporated by reference.

B. Monitoring Frequency.

(1) Initial Monitoring. A supplier of water to a community or nontransient noncommunity water system shall collect and analyze four consecutive quarterly samples for each contaminant listed in Regulation .07E of this chapter during each compliance period.

(2) A supplier of water may use data collected after January 1, 1990, if the data are generally consistent with the requirements of 40 CFR § 141.24(h), to satisfy the monitoring requirements of the initial compliance period. A single sample may be used to satisfy the requirement for four quarterly samples.

(3) A supplier of water to a community or nontransient noncommunity water system serving fewer than 3,300 people that collected samples between October 6, 1992 and September 30, 1993, and did not detect any contaminant listed in Regulation .07E of this chapter shall be considered to have met the initial monitoring requirements of §B(1) of this regulation for each contaminant so analyzed and not detected.

(4) A supplier of water to a community or nontransient noncommunity water system serving more than 3,300 persons may reduce the frequency of sampling to two quarterly samples in 1 year during each repeat compliance period, if there is no detection of a contaminant listed in Regulation .07E of this chapter in the initial monitoring period.

(5) A supplier of water to a community or nontransient noncommunity water system serving less than or equal to 3,300 persons may reduce the frequency of sampling to one sample during each repeat compliance period, if there is no detection of a contaminant listed in Regulation .07E of this chapter in the initial monitoring period.

C. Waivers.

(1) The Approving Authority may grant a waiver from the requirements of §B of this regulation to any supplier of water. The Approving Authority may grant a waiver after evaluating the factors specified in 40 CFR § 141.24(h)(6), which is incorporated by reference.

(2) For each compliance period, the Approving Authority shall reanalyze the conditions in accordance with the requirements of 40 CFR § 141.24(h)(6) and, based upon this analysis, may terminate a waiver, in which case the supplier of water shall comply with §B of this regulation.

D. Confirmation Samples. The Approving Authority may require a confirmation sample for positive or negative results. If required by the Approving Authority, the result shall be averaged with the first sampling result and the average used for the compliance determination specified in 40 CFR § 141.24(h)(11), which is incorporated by reference. The Approving Authority may delete the results of obvious sampling errors from this calculation.

E. Repeat Sampling Following Detections.

(1) If an organic contaminant listed in Regulation .07E of this chapter is detected, as defined in 40 CFR § 141.24(h)(18), which is incorporated by reference, in any sample, the supplier shall monitor quarterly for that contaminant at each sampling point which resulted in the detection.

(2) The Approving Authority may reduce the monitoring requirements of §E(1) of this regulation to annual testing pursuant to the requirements of 40 CFR § 141.24(h)(7)(ii) and (iii), which is incorporated by reference.

(3) A supplier of water which is permitted to monitor annually by the Approving Authority shall monitor during the quarter that previously yielded the highest analytical result.

(4) A supplier of water which has three consecutive annual samples with no detection of a contaminant is eligible for a waiver under §C of this regulation.

(5) If monitoring results in the detection of either aldicarb, aldicarb sulfone, or aldicarb sulfoxide, then the supplier shall collect and analyze repeat samples for aldicarb, aldicarb sulfone, and aldicarb sulfoxide. If monitoring results in the detection of either heptachlor or heptachlor epoxide, then the supplier shall collect and analyze repeat samples for heptachlor and heptachlor epoxide.

F. Repeat Sampling When Over MCLs.

(1) A supplier or water to a community or nontransient noncommunity water system which exceeds the maximum contaminant levels of Regulation .07E of this chapter, as determined by 40 CFR § 141.24(h)(11), shall monitor pursuant to the requirements of 40 CFR § 141.24(h)(8), which is incorporated by reference. A minimum of four quarterly samples is required.

(2) When the Approving Authority determines that a water system is reliably and consistently below the MCL, as determined by §G(1) of this regulation, following at least four quarterly samples showing that the system is in compliance, the supplier of water may reduce its monitoring to annual sampling with the approval of the Approving Authority.

G. Compliance Determination and Notification.

(1) Compliance with Regulation .07E of this chapter shall be determined by the Approving Authority pursuant to the requirements of 40 CFR § 141.24(h)(11).

(2) When a supplier of water has violated Regulation .07E of this chapter, as determined by §G(1) of this regulation, the supplier shall notify the Approving Authority as required by Regulation .19 of this chapter and give public notice as required by Regulation .20 of this chapter.

H. A supplier of water may reduce the total number of samples that shall be analyzed by the use of compositing. Compositing shall be performed according to the requirements of 40 CFR § 141.24(h)(10), which is incorporated by reference.

I. Analysis for the contaminants listed in regulation .07E of this chapter shall be conducted pursuant to 40 CFR § 141.24(e), (h)(13) and (h)(19), which is incorporated by reference.

J. The monitoring frequencies under this regulation are minimum requirements. The Approving Authority may increase the monitoring frequencies in situations when it determines more frequent monitoring is needed, in which case the supplier shall comply with these frequency determinations.

K. A supplier of water to a public water system shall monitor at the time designated by the Approving Authority within each compliance period.

L. Suppliers of water at all systems that begin operation after January 22, 2004 and at all systems that begin use of a new source of water after January 22, 2004 shall:

(1) Demonstrate compliance with the MCLs within a period of time specified by the Approving Authority;

(2) Comply with the initial sampling frequencies specified by the Approving Authority to ensure a system can demonstrate compliance with the MCL; and

(3) Conduct routine and increased monitoring frequencies in accordance with the requirements in this regulation.

M. Suppliers of water may be eligible for variances or exemptions from the maximum contaminant levels for organic chemicals based on criteria outlined in 40 CFR § 142.62.

Md. Code Regs. 26.04.01.15-1

Regulation .15-1 amended effective October 16, 2000 (27:20 Md. R. 1842)