SITE INFORMATION AND CORRESPONDENCE CASE 2

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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2002-0071 -3- CALIFORNIA NATURAL PRODUCTS WASTEWATER TREATMENT FACILITY SAN JOAQUINCOUNTY 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 fixture 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 (gpd) Year Projected Flow(gpd) 2000 250,000 2006 420,000 2001 280,000 2007 440,000 2002 330,000 2008 460,000 2003 350,000 2009 480,000 2004 375,000 2010 500,000 2005 400,000 17. The current average wastewater flow rate from the facility is 240,000 gpd; of this, a daily maximum of 60,000 gpd is discharged to the City of Lathrop wastewater system. Accounting for near-term growth of the CNP facility, the Discharger has proposed annual average and monthly average wastewater generation rates of 310,000 and 350,000 gpd. Based on the current discharge rate of 60,000 gpd of wastewater to the municipal system, the expected annual average and monthly average discharge to land will be 250,000 to 290,000 gpd. WASTEWATER SYSTEM 18. Process and cleanup wastewater is piped to a central collection sump where it is pumped to the treatment system. 19. Wastewater generated in the processing plant is characterized by a high organic matter and solids content. Effluent concentrations have declined substantially since the recent addition and optimization of additional wastewater pretreatment systems. The RWD reported the average concentrations of analytes in the process wastewater and treated wastewater are as follows: Constituent Units Untreated Wastewater t Treated Wastewater Z Biochemical Oxygen Demand mg/1 2,205 165 Chemical Oxygen Demand mg/l 5,287 300 Electrical Conductivity µmhos/cm 1,550 1,800 Total Dissolved Solids mg/l 2,190 1,1453 Fixed TDS mg/1 1,279 9943 Total Nitrogen mg/1 49.3 17.4 pH Standard 8.6 7.7 1 Untreated wastewater data from Wastewater Capacity Plan, 17 January 2000,prepared by B.Dickson. 2 Treated wastewater data from monthly average data,RWD Addendum,Table 6,Nov.2001. 3 Data from the Discharger's response to the tentative WDRs,March 2001.