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WASTE DISCHARGE REQUIREMENTS ORDER NO. -4-
<br /> PAT MITCHELL AND CALIFORNIA NATURAL PRODUCTS
<br /> WASTEWATER TREATMENT AND DISPOSAL FACILITY
<br /> SAN JOAQUIN COUNTY
<br /> 23. Based on projected increases in CND's wastewater flow rates, additional capacity at treatment
<br /> plants or additional land application areas will be necessary. CNP has investigated discharging to
<br /> alternative treatment plants such as the Sharpe Depot wastewater treatment plant or the planned
<br /> treatment systems proposed in the City of Lathrop. CNP has also considered using interim
<br /> capacity available in the City of Manteca's expansion project. Wastewater generation at CNP is
<br /> expected to increase in the future as presented in the table below. The data presented is the total
<br /> anticipated flow rate and will be split between the land application area and municipal treatment
<br /> system discharges.
<br /> Year Projected Flow (Qpo) Year Proiected Flow (¢po)
<br /> 2000 250,000 2006 578,000
<br /> 2001 288,000 2007 665,000
<br /> 2002 331,000 2008 765,000
<br /> 2003 380,000 2009 879,000
<br /> 2004 437,000 2010 1,011,000
<br /> 2005 503,000
<br /> 24. The treatment facility contains two bypass lines. The first bypass pipe allows discharge of
<br /> wastewater to land after the screening process. A second bypass pipe allows wastewater from the
<br /> DAF to be discharged to land without further treatment. Following the installation of the
<br /> pretreatment equipment in early 2000, a significant amount of wastewater bypassed the treatment
<br /> equipment due to various startup problems. Bypassing was stopped on 14 August 2000 and the
<br /> bypass lines were decommissioned. Bypassing the treatment system resulted in high strength
<br /> wastewater being discharged to land and caused objectionable odors. The flows that were diverted
<br /> are as follows:
<br /> Date Units Total Flow Flow to Ci tv Discharae Land App. Bypass FloPercent
<br /> w Diverted
<br /> 1/00 Gal/Mo 5,395,900 1,579,600 3,816,300 2,671,000 70.0
<br /> 2/00 Gal/Mo 5,879,500 2,774,100 3,105,400 2,061,622 66.4
<br /> 3/00 Gal/Mo 5,880,100 3,088,400 2,791,700 1,858,900 66.6
<br /> 4/00 Gal/Mo 4,645,800 2,410,500 2,235,300 1,886,100 84.4
<br /> 5/00 Gal/Mo 6,063,000 2,420,300 3,642,700 1,597,300 43.8
<br /> 6/00 Gal/Mo 5,418,400 1,259,000 4,159,400 683,100 16.4
<br /> 7/00 Gal/Mo 6,512,200 1,196,900 5,315,300 1,233,400 23.2
<br /> 8/00 Gal/Mo 7,945,300 2,884,400 5,060,900 588,400 11.6
<br /> 25. The Board received odor complaints in October 1987, July 1997, July 1998, March 2000, and July
<br /> 2000. The odor complaints concerned the Discharger's land treatment and disposal operations.
<br /> 26. Based on the anticipated wastewater quality discharged from the treatment facility when operated
<br /> properly, discharge of the wastewater should comply with the BOD Effluent Limitations presented in
<br /> Section B. Compliance with the effluent limits,combined with careful management of the
<br /> wastewater application area, should control objectionable odors at the application area.
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