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CEASE AND DESIST ORDE1*. R5-2004-0029 0 -3- <br /> CITY OF MANTECA <br /> WASTEWATER QUALITY CONTROL FACILITY <br /> SAN JOAQUIN COUNTY <br /> interim requirements and dates for their achievement are included in this Order. The time <br /> schedule does not exceed five years. <br /> 5. The interim limitations in this Order are based on the current treatment plant performance. In <br /> developing the interim limitation, where there are ten sampling data points or more, sampling <br /> and laboratory variability is accounted for by establishing interim limits that are based on <br /> normally distributed data where 99.9% of the data points will lie within 3.3 standard deviations <br /> of the mean (Basic Statistical Methods for Engineers and Scientists, Kennedy and Neville, <br /> Harper and Row). Therefore, the interim limitations in this Order are established as the mean <br /> plus 3.3 standard deviations of the available data. Where actual sampling shows an exceedance <br /> of the proposed 3.3-standard deviation interim limit, the maximum detected concentration has <br /> been established as the interim limitation. The interim limitations are summarized in the <br /> following table. <br /> Interim Effluent Limitations <br /> Number Max. Mean Standard Max.Daily <br /> of Concentration Concentration Deviation Limitation <br /> Samples <br /> Aluminum (ug/1) 12 350 150 91 450 <br /> Arsenic (ug/1) 12 14 12.5 1.0 16 <br /> Copper(ug/1) 12 13 9.0 1.9 15 <br /> Cyanide (u 1) 12 31 7.0 8.0 33 <br /> Electrical 18 1300 1099 119 15001 <br /> Conductivity <br /> umhos/cm <br /> Iron(ug/1) 12 730 428 161 960 <br /> Manganese u 11 120 43 36 160 <br /> MBAS (ug/1) 12 1800 618 451 2100 <br /> Nitrate (mg/1) 245 19 2.5 3.2 19 <br /> Nitrite (mg/1) 12 1.8 0.7 0.6 2.7 <br /> 1 Monthly average limitation <br />