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AMENDMENT TO MONITORING AND REPORTING PROGRAM -3- FOR MUNICIPAL SOLID WASTE LANDFILLS 5. Constituents -of -Concern (COC) Leachate Detection Report The discharger shall report to the Board by no later than 31 January of a given year the analytical results of the leachate sample taken the previous Fall, including an identification of all detected COCs in Attachment 3 that are not on the MSWLF's Constituent of Concern list (non -CDCs). During any year in which an Spring leachate retest is performed, the discharger shall submit a report to the Board, by no later than 31 July of that year, identifying all constituents which must be added to the MSWLF's COC list as a result of having been detected in both the (previous calendar year's) Fall sample and in the Spring retest sample. 1. Detection Monitoring Program (DMP) under revised Article 5 Each Discharger shall comply with the following detection monitoring program by 9 October 1994, unless and until the Board revises the waste discharge requirements for the MSWLF to include an alternative detection monitoring program that complies both with the federal MSW regulations and with the most recent revisions to Article 5 of Chapter 15. For each monitored medium, all Monitoring Points assigned to detection monitoring, and all Background Monitoring Points shall be monitored once each Fall/Winter and Spring/Summer (Fall/Winter and Spring/Summer Reporting Periods end on 31 March and 30 September, respectively) for the Monitoring Parameters listed in this Program. For any given monitored medium, a sufficient number of samples shall be taken from all Monitoring Points and Background Monitoring Points to satisfy the data analysis requirements for a given Reporting Period, and shall be taken in a manner that ensures sample independence to the greatest extent feasible. Ground water sampling shall also include an accurate determination of the ground water surface elevation and field parameters (pH, temperature, electrical conductivity, turbidity) for that Monitoring Point or Background Monitoring Point. Ground water elevations taken prior to purging the well and sampling for Monitoring Parameters shall be used to fulfill the Spring and Fall ground water gradient/direction analyses required. For each monitored ground water body, the discharger shall measure the water level in each well and determine ground water gradient and direction at least quarterly, including the times of expected highest and lowest elevations of the water level for the respective ground water body. Ground water elevations for all background and downgradient wells for a given ground water body shall be measured within a period of time short enough to avoid temporal variations in ground water flow which could preclude accurate determination of ground water gradient and direction. This information shall be included in the twice -yearly monitoring reports.