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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2010-0016 -35- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS NORTH COUNTY LANDFILL SAN JOAQUIN COUNTY notification submitted by certified mail within seven days of validation; and 2) Proceed in accordance with E.28 and/or E.29, below, as applicable. 28. Exceedances that the Discharger demonstrates per Section 20420(k)(7) are the result of sample corruption, laboratory interferences, error, natural variation in the water quality, statistical evaluation, or other cause not associated with a release from the unit shall not provide a preliminary indication of a release, or, in the case of a discrete retest, confirm a release. Retesting may be necessary, however, to make such demonstration or, such as in the case of error or laboratory interferences, to obtain valid monitoring data. 29. Any COC confirmed by retest as part of a release (new or existing) shall be added to the monitoring parameter list such that it is monitored during each regular monitoring event. 30. Notwithstanding the results of preliminary and/or confirmation testing under E.26 and E.27 above, the Discharger shall consider whether there is significant physical evidence of a release from the Unit per Title 27, Section 20385(a)(3), which states: Significant physical evidence of a release includes unexplained volumetric changes in surface impoundments, unexplained stress in biological communities, unexplained changes in soil characteristics, visible signs of leachate migration, and unexplained water table mounding beneath or adjacent to the Unit and any other change to the environment that could reasonably be expected to be the result of a release from the Unit. . . If the Discharger determines that there is either measurably significant or physically significant evidence of a release from the Unit at any monitoring point, the Discharger shall immediately implement the Response to a Release requirements contained in Section XI of the SPRR. Corrective Action Progress 31. In the event of a release, the data analysis methods shall also include trend analysis; an evaluation of the water chemistry; and preparation of contaminant contour plots to monitor the nature of the release and effectiveness of corrective action measures, as specified in the MRP. 32. Prior to termination of corrective action measures required under Section 20430(c), the discharger shall demonstrate, pursuant to Section 20430(f), and 40 CFR 258.58(e)(2) for an MSW landfill, that the constituents of the release have been reduced to levels below concentration limits throughout the entire