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MONITORING AND REPORTING PROGRAM FOR -8- CITY OF TRACY CLASS II LAND TREATMENT FACILITY SAN JOAQUIN COUNTY SURFACE WATER MONITORING Surface waters shall be sampled at a minimum of one station downstream and one station upstream of the Class II Land Treatment facility during the first storm of the rainy season which ;duces significant flow. Surface water samples shall be analyzed as indicated for GROUND WATER AND VADOSE ZONE MONITORING above with the addition of flow rate. WATER QUALITY PROTECTION STANDARD The Water Quality Protection Standard, as defined in §2550.2 of Chapter 15, shall consist of constituents of concern, their concentration limits, the point of compliance, and all water quality monitoring points. Constituents of concern shall include all waste constituents, reaction products, and hazardous constituents that are reasonable expected to be in or derived form waste contained in the land treatment units. Concentration limits in each medium shall consist of background concentration of each constituent of concern or concentrations greater than background pursuant to §2550.4 of Chapter 15. For each monitoring period, the Discharger shall determine whether there is statistically significant evidence of a release from the land treatment facility and whether the facility is in compliance with the Water Quality Protection Standard using procedures specified in §2550.7 of Chapter 15. If the Discharger, through a detection monitoring program, or the Board finds that there is a statistically significant evidence for a release from the treatment facility for any monitoring parameter or constituent of concern or significant physical evidence of a release from any land treatment facility, the Discharger shall notify the Board or acknowledge the Board's finding in writing within seven days, and shall implement verification procedures within 30 days, pursuant to §2550.7(e)(8)(E) of Chapter 15. Within 90 days, the Discharger shall submit to the Board the results of the resampling and either: 1. a report that demonstrates pursuant to §2550.8(k)(7) of Chapter 15 that a source other than the facility caused the evidence of a release, or that the evidence resulted from an error in sampling, analysis, or evaluation, or from natural variation in ground water, surface water, or the unsaturated zone; or 2. an amended Report of Waste Discharge for the establishment of an evaluation monitoring program, pursuant to §2550.9 of Chapter 15, to assess the nature and extent of the release from the treatment unit and to design a corrective action program meeting the requirements of §2550.10 of Chapter 15. Within 180 days of determining statistically significant evidence of a release, the Discharger shall submit an engineering feasibility study pursuant to §2550.10 of Chapter 15.