SITE INFORMATION AND CORRESPONDENCE CASE 2

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WASTE DISCHARGE REQUIREMENTS ORDER NO. -3- PAT MITCHELL AND CALIFORNIA NATURAL PRODUCTS WASTEWATER TREATMENT AND DISPOSAL FACILITY SAN JOAQUIN COUNTY 16. Solids collected on the screens are placed in containers. Solids which are collected in the lamella separator and DAF clarifier, are dewatered in a centrifuge. All solids are contained in bins, transported off-site, and used for animal feed or landfilled. 17. RO reject water normally is directed to the 13,000 gallon discharge tank but can be directed to the trickling filter. This is done occasionally if the wastewater discharged to the trickling filter becomes too acidic due to an overload of sugar and the resulting organic acids. The Discharger can presently lower pH, but cannot increase pH values during the treatment process. 18. After treatment, the wastewater is piped to the land application area which consists of 17.6 acres divided into 16 subbasins consisting of approximately one acre each. The disposal area has been laser leveled and is surrounded by a berm approximately two feet high. 19. The Discharger has recently added a pump station along the land application pipeline to allow reclamation of wastewater to 9.2 acres of landscaped area surrounding the existing facility and the south warehouse. The wastewater will be sprinkler applied to landscaped areas. 20. In the year 2000, wastewater discharge to the land application area ranged from 80,000 to 171,000 gallons per day(gpd). The Discharger also trucks approximately 8,000 gpd of wastewater to the City of Lathrop Crossroads treatment facility. 21. The City of Lathrop and the City of Manteca have permitted CNP to discharge up to 150,000 gpd of process wastewater and domestic wastewater to the Manteca wastewater treatment plant on an interim basis. CNP typically flows approximately 50,000 gpd to the municipal system. Additional wastewater disposal is available at higher disposal fees. 22. The flow to the municipal system utilizes capacity that is allocated to the City of Lathrop, but not yet used. CNP has purchased a capacity of 200,000 gpd in the expansion of the Manteca wastewater treatment plant that is currently in progress and is scheduled to become available in 2002. Additional interim unused capacity allocated to the City of Lathrop may be available at the City of Manteca plant temporarily. 23. CNP has investigated discharging to alternative treatment systems such as interim capacity available in the City of Manteca expansion project, Sharpe Depot wastewater treatment plant, and planned treatment systems proposed in the City of Lathrop. Based on projected increases in wastewater flow rates, additional capacity at treatment plants or additional land application areas will be necessary. Wastewater generation at CNP is expected to increase in the future as presented in the table below. The data presented is the total anticipated flow rate and will be split between the land application area and municipal treatment system discharges. Year Projected Flow (arid) Year Projected Flow (gpd) 2000 250,000 2006 578,000 2001 288,000 2007 665,000 2002 331,000 2008 765,000 2003 380,000 2009 879,000