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WASTE DISCHARGE REQUIREMENTS ORDER NO. -2- <br /> PAT MITCHELL AND CALIFORNIA NATURAL PRODUCTS <br /> WASTEWATER TREATMENT AND DISPOSAL FACILITY <br /> SAN JOAQUIN COUNTY <br /> field was located approximately 500 to 750 feet to the north of the present disposal field. The <br /> previously used application area locations are presented on Attachment A. <br /> 8. Products for retail sale are packaged on site. Aseptic packaging under sterile conditions requires <br /> heated water from boilers and regular acid/caustic tank and equipment cleaning cycles. Reverse <br /> Osmosis (RO) is used to treat boiler feed water. RO reject water with a total dissolved solids <br /> concentration of approximately 1,200 mg/1 is discharged to the process wastewater discharge tank. <br /> 9. Caustic and acid cleaning solutions(potassium hydroxide solution and nitric acid/phosphoric acid <br /> mixture) are recycled several times prior to discharge to the wastewater system. Ozone has <br /> recently been added to the processing plant for sanitation. Caustic and acid solutions are <br /> neutralized, forming potassium nitrate. The nitrate is then consumed by the trickling filter. <br /> 10. The specific conductance of the water supply, before use by the Discharger, ranges from 470 <br /> µmhos/cm to 660 µmhos/cm. There is approximately a three-fold increase in total dissolved solids <br /> concentration in wastewater. This increase in total dissolved solids is largely due to the use of <br /> reverse osmosis which is required to produce a water suitable for the company's products. In the <br /> past, the Discharger switched from ion exchange to reverse osmosis to reduce the amount of total <br /> dissolved solids in the process wastewater. <br /> 11. Process and cleanup wastewater is piped to a central collection sump where it is pumped to the <br /> treatment system. <br /> 12. Wastewater generated in the processing plant is characterized by a high organic matter and solids <br /> content. Effluent concentrations have declined substantially since the recent addition and <br /> optimization of additional wastewater pretreatment systems. It is anticipated that the average <br /> concentrations of analytes in the process wastewater and treated wastewater are as follows: <br /> Constituent Units Untreated Wastewater Treated Wastewater 2 <br /> Biochemical Oxygen Demand mg/1 2,205 100 <br /> Chemical Oxygen Demand mg/l 5,287 517 <br /> Electrical Conductivity µmhos/cm 1,550 1,681 <br /> Total Dissolved Solids mg/l 2,190 1,145 <br /> Fixed TDS mg/l 1,279 994 <br /> Total Nitrogen mg/1 49.3 37 <br /> pH Standard 8.6 7.8 <br /> 1 Untreated wastewater data from Wastewater Capacity Plan, 17 January 2000,prepared by B.Dickson. <br /> Z Treated wastewater data from the Discharger's response to the tentative WDRs and monitoring reports. <br /> 13. CNP's treatment of process wastewater consists of screening using a rotary screen and two 100- <br /> micron stainless steel parabolic screens; holding/recycle tank; pH control; Dissolved Air Flotation <br /> (DAF) clarifier; a 45-foot diameter, 20-foot high trickling filter; and a 600 gallon per minute <br /> (gpm) lamella separator with flocculent metering system. Prior to discharge, the wastewater is <br /> stored in a 13,000 gallon tank. <br /> cwq..rx:s..c.i x.. nu..i.ennwnx wnw� <br />