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WASTE DISCHARGE RE IREMENTS ORDER NO. -15- SAN JOAQUIN COUNTY FOR POST-CLOSURE AND CORRECTIVE ACTION MONITORING CORRAL HOLLOW SANITARY LANDFILL SAN JOAQUIN COUNTY b) within 90 days of determining"measurably significant" evidence of a release, submit a report to the Board that demonstrates that a source other than the Unit caused the evidence, or that the evidence resulted from error in sampling, analysis or evaluation, or from natural variation in groundwater, surface water, or the unsaturated zone. C. If the Executive Officer determines, after reviewing the submitted report(s),that the VOCs) detected originated from a source other than the Unit(s),the Executive Officer will make appropriate changes to the monitoring program. 22. If the Executive Officer determines, after reviewing the submitted report, that the detected VOCs) most likely originated from the Unit(s), the Discharger shall immediately implement the requirements of XI. Response To A Release, C. Release Has Been Verified, contained in the Standard Provisions and Reporting Requirements. F. REPORTING REQUIREMENTS 1. In the event the Discharger does not comply or will be unable to comply with any prohibition or limitation of this Order for any reason,the Discharger shall notify the appropriate Board office by telephone as soon as it or its agents have knowledge of such noncompliance or potential for noncompliance, and shall confirm this notification in writing within two weeks. The written notification shall state the nature,time, and cause of noncompliance, and shall describe the measures being taken to prevent recurrences and shall include a timetable for corrective actions. 2. The Discharger shall retain records of all monitoring information, including all calibration and maintenance records, all original strip chart recordings of continuous monitoring instrumentation, copies of all reports required by this Order, and records of all data used to complete the application for this Order. Records shall be maintained for a minimum of five years from the date of the sample, measurement, report, or application. This period may be extended during the course of any unresolved litigation regarding this discharge or when requested by the Executive Officer. Such legible records shall show the following for each sample: a. Sample identification and the monitoring point or background monitoring point from which it was taken, along with the identity of the individual who obtained the sample;