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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2010-0016 -36- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS NORTH COUNTY LANDFILL SAN JOAQUIN COUNTY <br /> <br /> zone affected by the release. During this “proof period”, the Discharger shall demonstrate that: <br />a. The concentration of each constituent in each sample from each monitoring point remained at or below its concentration limit for at least three years, beginning immediately after the suspension of corrective action measures; and <br />b. The individual sampling events for each monitoring point must have been evenly distributed throughout the proof period and have consisted of at least four sampling events per year per monitoring point (i.e., quarterly monitoring). <br />c. At the end of the proof period, a single data analysis method (statistical or nonstatistical, as appropriate) shall be used for each monitoring parameter at each monitoring point to determine whether that parameter has been reduced to levels at or below concentration limits at that monitoring point. <br />The Discharger shall notify the Board and obtain Executive Officer approval prior to (1) suspending corrective action measures prior to making the above demonstration; and (2) terminating corrective action measures after making the above demonstration. <br />33. Any proposal for concentration limits greater than background (CLGBs) shall be accompanied by the requisite demonstration under Section 20400(c) (i.e., that it is technologically or economically infeasible to achieve the background value for that constituent and that the constituent will not pose a substantial present or potential hazard to human health or the environment). Approval of CLGBs shall require approval of revised WDRs by the Regional Water Board. <br />F. REPORTING REQUIREMENTS <br />1. The Discharger shall comply with the reporting requirements specified in this Order, MRP No. R5-2010-0016, and the SPRR. <br />2. The Discharger shall immediately notify the Regional Water Board of any flooding, unpermitted discharge of waste off-site, equipment failure, slope failure, or other change in site conditions that could impair the integrity of waste or leachate containment facilities or precipitation and drainage control structures. <br />3. If monitoring reveals substantial or progressive increases of leachate generation above the design leachate flow by the Unit or portion of the Unit, such that the depth of fluid on any portion of the LCRS (excluding the leachate removal pump sump) exceeds 30 cm, the Discharger shall immediately notify the Board in writing within seven days. The notification shall include a