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