Table 1.1 IOC Monitoring Requirements System Monitoring type Source Sampling frequency Notes type Once during initial 3 year compliance GW All CWSs period. Initial Routine & Sampling NTNCWs Annually during the initial 3 year SW compliance period. All CWSs GW Reduced Sampling & Same as initial. NTNCWs SW Once during subsequent 3 year GW compliance period. All CWSs Repeat Sampling & NTNCWs Annually during each subsequent 3 year SW compliance period. Minimum of 2 quarters beginning next GW quarter to determine R&C <MCL. All CWSs Increased Sampling & NTNCWs Minimum of 4 quarters beginning next SW quarter to determine R&C <MCL. SW systems must have monitored annually for 3 consecutive years and GW systems must have conducted 3 Waivers All CWSs consecutive compliance periods without must be Waivers & Any exceeding the MCL. Max waiver period is issued in NTNCWs 9 years. One sample must be collected writing. during the waiver period. Waivers must be renewed every 9 years. Code of Federal Regulation (§141.23(a)(1-3)); (§141.23(c)(1-4)) & (§141.23(c)(8))
Table 1.1 IOC Monitoring Requirements Monitoring type System type Source Sampling frequency Notes Initial Routine Sampling All CWSs & NTNCWs GW Once during initial 3 year compliance period. SW Annually during the initial 3 year compliance period. Reduced Sampling All CWSs & NTNCWs GW Same as initial. SW Repeat Sampling All CWSs & NTNCWs GW Once during subsequent 3 year compliance period. SW Annually during each subsequent 3 year compliance period. Increased Sampling All CWSs & NTNCWs GW Minimum of 2 quarters beginning next quarter to determine R&C <MCL. SW Minimum of 4 quarters beginning next quarter to determine R&C <MCL. Waivers All CWSs & NTNCWs Any SW systems must have monitored annually for 3 consecutive years and GW systems must have conducted 3 consecutive compliance periods without exceeding the MCL. Max waiver period is 9 years. One sample must be collected during the waiver period. Waivers must be renewed every 9 years. Waivers must be issued in writing. Code of Federal Regulation (§141.23(a)(1-3)); (§141.23(c)(1-4)) & (§141.23(c)(8))
PHASE%20II_V_WAIVER_PACKET.docx