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WASTE DISCHARGE REQUIREMENTS ORDER NO. • -2- <br /> PAI:MITCHELL AND CALIFORNIA NATURAL PRODUCTS <br /> WASTEWATER TREATMENT AND DISPOSAL FACILITY <br /> SAN JOAQUIN COUNTY <br /> 7. From 1980 to 1996, CNP's disposal field was located approximately 1,000 feet northwest of the <br /> existing field,next to the Southern Pacific railroad tracks. Between 1996 and 1997, the disposal <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 /> concentratioruninera4zatieR in wastewater. This increase in total dissolved solids is lars4ely due to <br /> the use of reverse osmosis which is required to produce a water suitable for the company's <br /> products. In the past, the Discharger switched from ion exchange to reverse osmosis to reduce the <br /> amount of total dissolved solids in the process wastewater. The Diset afger is e••-rent)y developing <br /> a plan to separate the aeid'eaustie eleaning waste stFeam from the rest efthe Wastewateraftd fflanage <br /> it by eentraeting with a+i off site disposal fiFm. <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 t Treated Wastewater 2 <br /> Biochemical Oxygen Demand mg/1 2,205 3100 <br /> Chemical Oxygen Demand mg/1 5,287 51780 <br /> Electrical Conductivity umhos/cm 1,550 1,681 «�� <br /> Total Dissolved Solids mg/l 2,190 1,145 Z,490-mo <br /> Fixed TDS mg/l 1,279 994 ,2' <br /> Total Nitrogen mg/1 49.3 37 401 <br /> pH Standard 8.6 7.8 -7 <br /> ' Untreated wastewater data from Wastewater Capacity Plan, 17 January 2000,prepared by B.Dickson. <br /> z Treated wastewater data from RWBahe 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 />