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MONITORING AND REPORTING PROGRAM _4_ SAN JOAQUIN COUNTY FOOTHILL SANITARY LANDFILL INCORPORATED FOOTHILL SANITARY LANDFILL FACILITY CLASS III LANDFILL SAN JOAQUIN COUNTY If subsequent sampling of "background" monitoring wells indicates significant water quality changes due to either seasonal fluctuations or other reasons unrelated to waste management activities at the site, the Discharger may request modification of the water quality protection standards. Statistical Procedures for Determining Significant Increases The significance of increases in indicator parameters and waste constituents over water quality protection standards shall be established through the use of a Board approved statistical procedure. REPORTING In reporting the monitoring data, the Discharger shall arrange the data in tabular form so that the date, the constituents, the concentrations, and the units are readily discernible. The data shall be summarized in such a manner so as to illustrate clearly the compliance with waste discharge requirements. Monthly monitoring reports shall be submitted to the Board by the 15th day of the month following the month in which the samples were taken. Quarterly, semiannual , and annual monitoring reports shall be submitted to the Board by the 15th day of the month. following the calendar quarter in which the samples were taken. The results of any monitoring done more frequently than required at the locations specified herein shall be reported to the Board. A report shall be submitted to the Board by 30 January of each year containing both tabular and graphical summaries of the monitoring data obtained during the previous year. The report shall include a discussion of compliance with the waste discharge requirements. The Discharger shall implement the above monitoring program on the effective date of this Order. Ordered by— ' c, WILLIAM H. CR S Executive Officer 25 ':nuary 1991 JKT:RAE:mkk:11/30/90