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WASTE DISCHARGE RE MENTS ORDER NO. -19- SAN JOAQUIN COUNTY FOR POST-CLOSURE AND CORRECTIVE ACTION MONITORING CORRAL HOLLOW SANITARY LANDFILL SAN JOAQUIN COUNTY a. All monitoring parameters and constituents of concern shall be graphed so as to show historical trends at each monitoring point and background monitoring point, for all samples taken within at least the previous five calendar years. Each such graph shall plot the concentration of one or more constituents for the period of record for a given monitoring point or background monitoring point, at a scale appropriate to show trends or variations in water quality. The graphs shall plot each datum,rather than plotting mean values. For any given constituent or parameter,the scale for background plots shall be the same as that used to plot downgradient data. Graphical analysis of monitoring data may be used to provide significant evidence of a release. b. Unless otherwise exempted by the Executive Officer, all monitoring analytical data obtained during the previous two six-month reporting periods, shall be presented in tabular form as well as on 3.50" computer diskettes, either in MS-DOS/ASCII format or in another file format acceptable to the Executive Officer. Data sets too large to fit on a single diskette may be submitted on disk in a commonly available compressed format(e.g. PKZIP). The Board regards the submittal of data in hard copy and in digital format as"...the form necessary for..." statistical analysis [§20420(h)], in that this facilitates periodic review by the Board. C. A comprehensive discussion of the compliance record, and the result of any corrective actions taken or planned which may be needed to bring the Discharger into full compliance with the waste discharge requirements. d. A map showing the area and elevations in which filling has been completed during the previous calendar year and a comparison to final closure design contours. e. A written summary of the monitoring results, indicating any changes made or observed since the previous annual report. £ An evaluation of the effectiveness of the leachate monitoring/control facilities. G. PROVISIONS 1. The Discharger shall maintain a copy of this Order at the facility and make it available at all times to facility operating personnel, who shall be familiar with its contents, and to regulatory agency personnel. 2. The Discharger shall comply with all applicable provisions of Title 27 and 40 Code of Federal Regulations Part 258 (Subtitle D)that are not specifically referred to in this Order.