SITE INFORMATION AND CORRESPONDENCE CASE 2

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WASTE DISCHARGE REQUIREMENTS ORDER NO. -2- PAT MITCHELL AND CALIFORNIA NATURAL PRODUCTS WASTEWATER TREATMENT AND DISPOSAL FACILITY SAN JOAQUIN COUNTY 8. Products for retail sale are packaged on site. Aseptic packaging under sterile conditions requires heated water from boilers and regular acid/caustic tank and equipment cleaning cycles. Reverse Osmosis (RO) is used to treat boiler feed water. RO reject water with a total dissolved solids concentration of approximately 1,200 mg/l is discharged to the process wastewater discharge tank. 9. Caustic and acid cleaning solutions are recycled several times prior to discharge to the wastewater system. Ozone has recently been added to the processing plant for sanitation. 10. The specific conductance of the water supply, before use by the Discharger, ranges from 470 µmhos/cm to 660 µmhos/cm. There is approximately a three-fold increase in mineralization in wastewater. The Discharger is currently developing a plan to separate the acid/caustic cleaning waste stream from the rest of the wastewater and manage it by contracting with an off-site disposal firm. 11. Process and cleanup wastewater is piped to a central collection sump where it is pumped to the treatment system. 12. Wastewater generated in the processing plant is characterized by a high organic matter and solids content. It is anticipated that the average concentrations of analytes in the process wastewater and treated wastewater are as follows: Constituent Units Untreated Wastewater Treated Wastewater 2 Biochemical Oxygen mg/l 2,205 300 mg/1 Chemical Oxygen Demand mg/l 5,287 500 mg/l Electrical Conductivity mg/l 1,550 1,550 µmhos/cm Total Dissolved Solids mg/1 2,190 2,190 mg/l Fixed TDS mg/1 1,279 1,279 mg/l Total Nitrogen mg/l 49.3 40 mg/1 pH Standard 8.6 7.7 1 Untreated wastewater data from Wastewater Capacity Plan, 17 January 2000,prepared by B.Dickson. Z Treated wastewater data from RWD. 13. CNP's treatment of process wastewater consists of screening using a rotary screen and two 100- micron stainless steel parabolic screens; holding/recycle tank; pH control; Dissolved Air Flotation (DAF) clarifier; a 45-foot diameter, 20-foot high trickling filter; and a 600 gallon per minute (gpm) lamella separator with flocculent metering system. Prior to discharge, the wastewater is stored in a 13,000 gallon tank. 14. The trickling filter operates at 2,500 gpm. Wastewater is recycled approximately ten times through the filter. Because the process wastewater is high in BOD and low in nitrogen, the Discharger adds ammonium nitrate to the wastewater to optimize BOD removal in the trickling filter. 15. Wastewater samples are collected by a time composite sampling device which collects a 100-m1 sample every one-half hour from the 13,000 gallon discharge tank. CWga_RLAtiNC.I N.�AJ NM1NDPIYi.