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MONITORING AND REPORTING PROGRAM -2- <br /> USC/A DIVISION OF HYDRITE CHEMICAL COMPANY <br /> CLASS II SURFACE IMPOUNDMENT <br /> SAN JOAQUIN COUNTY <br /> WASTE DISCHARGE MONITORING <br /> The Discharger shall monitor all wastes discharged to the Class II surface <br /> impoundment on a monthly basis and report to the Board as follows: <br /> Report in Frequency of <br /> Parameter Units of Reporting <br /> Quantity discharged gallons Quarterly <br /> pH range pH Quarterly <br /> A hydraulic mass balance shall be compiled and submitted monthly demonstrating <br /> site capacity for the following 12 month period. The balance shall consider <br /> waste input, anticipated precipitation based on past precipitation conditions for <br /> the year, and evaporation. Pond freeboards and capacity shall be accurately <br /> recorded and used in the calculation of the mass balance. <br /> SURFACE IMPOUNDMENT MONITORING <br /> Surface impoundment wastewater shall be analyzed annually until the surface <br /> impoundment is closed. The constituents shall be the same as those listed in the <br /> Ground Water Monitoring Program, including metals. Wastewater sampling locations <br /> shall be at the midpoints of each side of the surface impoundment. The samples <br /> shall be composited to represent a single surface impoundment sample. <br /> WATER QUALITY PROTECTION STANDARD <br /> The Discharger shall submit by 1 July 1992 a Water Quality Protection Standard. <br /> The Water Quality Protection Standard, as defined in §2550.2 of Chapter 15, shall <br /> consist of constituents of concern, their concentration limits, the point of <br /> compliance, and all water quality monitoring points. <br /> Constituents of concern shall include all waste constituents, reaction products, <br /> and hazardous constituents that are reasonably expected to be in or derived from <br /> waste contained in the waste management unit (WMU) . Concentration limits in each <br /> medium shall consist of background concentrations of each constituent of concern <br /> or concentrations greater than background pursuant to Section 2550.4 of Chapter <br /> 15. For each monitoring period, the Discharger shall determine whether there is <br /> statistically significant evidence of a release from the WMU and whether the WMU <br /> is in compliance with the Water Quality Protection Standard using procedures <br /> specified in §2550.7 of Chapter 15. <br /> If the Discharger, through a detection monitoring program, or the Board finds <br /> that there is a statistically significant evidence for a release from the WMU for <br /> any monitoring parameter or constituent of concern or significant physical <br />