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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2004-0018 -3- M&L COMMODIES, SOUTHWEST HIDE COMPANY SOUTHWEST HIDE WASTE WATER PONDS SAN JOAQUIN COUNTY MONITORING POINTS Groundwater: The current upgradient groundwater Monitoring Points are monitoring wells MW-4, and -5. Corrective Action Groundwater Monitoring Points shall be MW-7, -8, -15, -17, -19R, and 21. Corrective Action Monitoring Points will be used to determine effectiveness of the corrective action. SEMI ANNUAL EVALUATION OF CORRECTIVE ACTION EFFECTIVENESS A semi-annual evaluation of the effectiveness of the corrective action for this facility and response if pollution in groundwater aerial extent expands, the concentrations increases and/or there is no downward trend in the constituents. Semi-Annual evaluation shall be based on the following: 1. A determination whether the pollution plume has expanded in aerial extent. This evaluation shall be based on the plume aerial extent as of 1 January 2004. 2. A determination if any trigger Constituent of Concern concentrations have been exceeded. Trigger concentrations will be calculated for each individual Corrective Action Monitoring Point based on historical data before 1 January 2004, using the appropriate tolerance factors. These Trigger Concentrations shall be submitted to Board staff for concurrence. Proposed trigger concentrations will be submitted within 90 days of adoption of this Order. Individual trigger concentrations will be calculated for each Corrective Action Groundwater Monitoring Point (intrawell concentration limits). New trigger concentrations shall be established annually if downward trends occurring and submitted with the first semiannual monitoring report. 3. A determination whether the plume individual constituent concentrations are decreasing. RESPONSE TO SEMI-ANNUAL EVALUATION OF CORRECTIVE ACTION This section is required response if in Semi-Annual Evaluation the pollution plume has expanded, a constituent(s) has exceed trigger concentration or the plume individual concentrations are not decreasing. 1. If the plume has migrated beyond the 1 January 2004 configuration, then the discharger shall submit a focused feasibility study to implement active remediation within 120 days. 2. If one or more of the Corrective Action Monitoring Points contain concentrations exceeding the trigger concentrations these monitoring points will be retested to confirm the detection per the Standard Provisions. If the detection is confirmed the impacted monitoring point(s) will go to quarterly monitoring for at least one year. If after one year of quarterly sampling concentrations have returned to below the trigger concentration then the impacted monitoring