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WASTE DISCHARGE REQUIREMnNTS ORDER NO.R5-2003-0178 -2_ MORADA PRODUCE COMPANY LINDEN PACKING SHED SAN JOAQUIN COUNTY Wastewater in the pond will be used for irrigation of approximately 160 acres of walnut orchards adjacent to the packing facility. 8. Asparagus will be spray washed on a conveyor with uncooled non-chlorinated water. The clean asparagus will then be packed into boxes and sprayed for five to seven minutes with chilled chlorinated water in two hydrocooler units. The chlorine concentration will be 50 to 60 mg/L. Chilled water in the hydrocooler will be recycled during processing activities. The hydrocooler water will be discharged to the wastewater pond twice weekly. 9. Similar to the asparagus, cherries will be rinsed with non-cooled water followed by chilled chlorinated water. The chlorine concentration will be 50 to 60 mg/L. Chilled water in the hydrocooler will be recycled during processing activities. Approximately twice a week, the hydrocooler water will be discharged to the wastewater pond. 10. The Discharger cannot characterize the asparagus and cherry washing wastewater until the processing season begins in 2004. However, it is anticipated that the wastewater should contain low levels of total dissolved solids (TDS) and biochemical oxygen demand(BOD). Wastewater quality data for chlorine and trihalomethanes (THMs)was collected, as described below. 11. THMs are formed when chlorinated water is brought into contact with organic matter. At Morada Packing Company, organic matter may be naturally present in the well water supply, may be introduced into the process water during the chilling operation, or may be present in the wastewater pond. Therefore, it is possible that THMs will be present in the wastewater. 12. A THM formation potential test was performed using water from the site's supply well. The test determines the amount of THMs that could be formed with up to seven days of contact time. The THM formation potential was low(6.5 gg/L after seven days). However, the test did not take into account the chlorine concentration in the hydrochiller water, which contains a chlorine concentration of 50-60 mg/L. Samples were also collected from the hydrochiller water and were analyzed for chlorine and THMs. Chlorine concentrations ranged from 0.50 mg/L to 2.14 mg/L. Chloroform was the only THM detected; its concentration ranged from 16 gg/L to 25 gg/L. 13. The Discharger is currently evaluating the use of peroxyacetic acid(PAA) as an alternative to chlorine for disinfection of process water. Because THMs are not generated when PAA is used, the use of PAA may result in reduced monitoring requirements. The Monitoring and Reporting Program (MRP) attached to this order includes requirements for monitoring chlorine and THMs. If the Discharger discontinues the use of chlorine, the Discharger can request revision of the MRP to remove the chlorine and THMs monitoring requirements. WASTEWATER SYSTEM 14. Stormwater is collected from paved areas and buildings, and is piped to the storage pond. Because industrial wastewater is mixed with stormwater in the pond, all the water collected in the pond will be handled and disposed of as industrial wastewater.