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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 /> Year Projected Flow (gpd) Year Projected Flow (end)
<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. Since the installation of the pretreatment
<br /> equipment in early 2000, a significant amount of wastewater has bypassed the treatment
<br /> equipment. Bypassing the treatment system results in high strength wastewater being discharged
<br /> to land and causes objectionable odors. The flows that have been diverted are as follows:
<br /> Date Units Total Flow Flowto City Land App. Bypass Flow Percent
<br /> Discharge Diverted
<br /> 1/00 Gallons 5,395,900 1,579,600 3,816,300 2,671,000 70.0
<br /> 2/00 Gallons 5,879,500 2,774,100 3,105,400 2,061,622 66.4
<br /> 3/00 Gallons 5,880,100 3,088,400 2,791,700 1,858,900 66.6
<br /> 4/00 Gallons 4,645,800 2,410,500 2,235,300 1,886,100 84.4
<br /> 5/00 Gallons 6,063,000 2,420,300 3,642,700 1,597,300 43.8
<br /> 6/00 Gallons 5,418,400 1,259,000 4,159,400 . 683,100 16.4
<br /> 7/00 Gallons 6,512,200 1,196,900 5,315,300 1,233,400 23.2
<br /> 8/00 Gallons 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 Effluent Limitations presented in
<br /> Section C. Compliance with the effluent limits combined with careful management of the
<br /> wastewater application area should control objectionable odors at the application area.
<br /> 27. The annual loading rate for selected constituents was calculated based on anticipated concentrations
<br /> and flow rates. The anticipated flow rate is 200,000 gallons per day. The data is presented below.
<br /> Concentration Application Area Loading Rate
<br /> Constituent Units (mg/) acres (lbs/acre year)
<br /> BOD5 mg/1 300 17.6 10,378
<br /> Nitrogen mg/l 40 17.6 1,384
<br /> TDS mg/l 1,279 17.6 44,243
<br /> 28. Soil borings were taken in the land application area in July 1988. The soil was described as silt,
<br /> sand, and clay mixtures. According to the San Joaquin County Soil Survey, the soils underlying the
<br /> land application site consist of a loamy coarse sand and a fine sandy loam, with rapid and
<br /> moderately rapid permeabilities,respectively. The sandy loam soils contain a Weakly cemented to a
<br /> strongly cemented hardpan layer at a depth of four to six feet. Several years ago,the Discharger deep-
<br /> ripped through this hardpan layer to improve percolation.
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