SITE INFORMATION AND CORRESPONDENCE CASE 2

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• • . . WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2003-0141 -2- CALIFORNIA NATURAL PRODUCTS WASTEWATER TREATMENT FACILITY SAN JOAQUIN COUNTY 8. The facility is equipped with a Clean In Place(CIP) system. Caustic and acid cleaning solutions (potassium hydroxide solution and nitric acid/phosphoric acid mixture) are recycled several times prior to discharge to the wastewater system. Caustic and acid solutions are neutralized, forming potassium nitrate. The trickling filter then consumes much of the nitrate. Residual potassium and nitrate are further taken up by the cropping activities in the land application areas. 9. CNP has been discharging process wastewater to land since the early 1980s; however, the discharge volume averaged less than 100 gallons per day(gpd) until approximately 1990. Based on the low flow and wastewater characteristics, WDRs were initially waived in accordance with the provisions of Regional Board Resolution 82-036; the Regional Board first adopted WDRs for this discharge in 1998. Much larger flows were discharged to land thereafter. 10. From 1980 to 1997, CNP's disposal area was located near the processing facility. The current and previously used application area locations are presented on Attachment A. The 17.6 acre land application area was developed and irrigation pivots were installed in 1996. In 2002, a 16.0 acre land application area on Louise Avenue was added to the application system. 11. The Discharger plans to sell 7.5 acres of the 17.6 acre land application area. That portion of the 17.6 acre parcel will no longer be used for land application of wastewater. To offset the lost area and develop additional land application area, the Discharger is developing a 29.7 acre parcel for land application of wastewater. This latest parcel is to the north of the 16.0 acre parcel. 12. The City of Lathrop and the City of Manteca have permitted CNP to discharge up to 150,000 gpd of process and domestic wastewater to the Manteca wastewater treatment plant through the City of Lathrop's collection system on an interim basis. However,because of declining capacity at the Manteca treatment plant, a discharge maximum of 60,000 gpd was imposed. CNP typically has discharged approximately 50,000 gpd to the municipal system. The RWD states the Discharger will continue to discharge approximately 60,000 gpd of wastewater to the municipal system, barring further restrictions by the City of Manteca or the City of Lathrop. 13. 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 200,160 gpd in the expansion of the Manteca wastewater treatment plant that is currently in progress and is currently scheduled to become available in 2005. 14. Based on projected increases in CNP's wastewater flow rates, additional capacity at treatment plants or additional land application areas will be necessary. CNP has investigated discharging to alternative treatment plants such as the Sharpe Depot wastewater treatment plant or the planned treatment systems proposed in the City of Lathrop. CNP has also considered using interim capacity available in the City of Manteca's expansion project. 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.