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AMENDMENT TO MONIT ORING AND REPORTING PROGRAM -2- FOR MUNICIPAL SOLID WASTE LANDFILLS MSWLF and any permanent or ephemeral zones of perched water underlying the MSWLF; b. Demonstrate that the MSWLF's existing and proposed monitoring systems meet: i. the requirements of 40 CFR 258.5 1(a,c, and d) and 23 CCR 2550.7(b); and ii. the requirements of 23 CCR 2550.7(c), if the MSWLF is in close proximity to any affectable surface water body (only for dischargers whose waste discharge requirements, as of the effective date of this Order, have not been revised to incorporate the July 1, 1991, revisions to Article 5 of Chapter 151; and iii. the requirements of 23 CCR 2550.7(d), if the MSWLF is overlying an unsaturated zone that can be monitored feasibly [only for dischargers whose waste discharge requirements, as of the effective date of this Order, have not been revised to incorporate the July 1, 1991, revisions to Article 5 of Chapter 15]; C. Include a map showing the Monitoring Points and Background Monitoring Points and showing the Point of Compliance under 23 CCR 2550.5 (i.e., the downgradient boundary of the unit, with respect to the flow direction of ground water in the uppermost aquifer); d. Estimate the Compliance Period under 23 CCR 2550.6; and e. Include a list of all Constituents of Concern (COC). f Identify locations and methods of leachate sampling for detection of COCs. 2. Detection Monitoring Report The Discharger shall submit reports of the results of detection monitoring in accordance with the schedule specified in the existing Monitoring and Reporting Program, or, alternatively, in accordance with the Fall/Winter and Spring/Summer Reporting Periods which end 31 March and 30 September, respectively. 3. Annual Monitoring Summary Report The Discharger shall submit the Annual Monitoring Summary Report as specified in the Standard Provisions and Reporting Requirements. 4. Constituents-of-Concern(COC) 5 Year Report The Discharger shall submit reports of the results of the monitoring for the Constituents of Concern every 5 years, or more frequently if required by the existing Monitoring and Reporting Program. The COC Report may be combined with a Detection Monitoring Report or an Annual Summary Report having a Reporting Period that ends at the same time.