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PARTI <br />Page No. 20 <br />Permit No.: CO-0000906 <br />• 1 2011, Groundwater Monitorin <br />Effective Beginning January Wells 050A 050B 050C and 050D <br /> . <br />g. <br /> Groundwater Parameter Frequency Sample Type <br /> Static Water Elevation in Well, ft above sea level Monthly In -Situ <br /> Specific Conductance, dS/m Monthly Grab <br /> Temperature, °C Monthly In -Situ <br /> pH, s.u. (minimum-maximum) Monthly In -Situ <br /> Total Coliform, no/100 nil Monthly Grab <br /> Dissolved Nitrate plus Nitrite as N, mg/l Monthly Grab <br /> Dissolved Chloride, mg/1 Monthly Grab <br /> Dissolved Sulfate, mg/l Monthly Grab <br /> Total Dissolved Solids, mg/l Monthly Grab <br /> Dissolved Arsenic, µg/1 <br />Monthly <br />Grab <br /> Dissolved Cadmium, µg/l Monthly Grab <br /> Dissolved Chromium (combined tri +3 and hex +6 forms), µg/l Monthly Grab <br /> Dissolved Copper, µg/1 <br />Monthly <br />Grab <br /> Dissolved Iron, µg/l Monthly Grab <br /> Dissolved Lead, µg/1 Monthly Grab <br /> Dissolved Manganese, µg/1 <br />Monthly <br />Grab <br /> Dissolved Mercury, µg/l Quarterly Grab <br /> Dissolved Nickel, µg/l Monthly Grab <br />• <br />Dissolved Selenium, µg/1 <br />Monthly <br />Grab <br /> Dissolved Silver, µg/l Monthly Grab <br /> Dissolved Zinc, µg/1 <br />Monthly <br />Grab <br />Self-monitoring sampling by the permittee for compliance with the monitoring requirements specified above shall be <br />performed at the following location(s): 050A - at upgradient monitoring well; 050B, 050C and 050D - at the <br />downgradient monitoring wells. <br />h. Oil and Grease Monitoring <br />For every outfall with oil and grease monitoring, in the event an oil sheen or floating oil is observed, a grab sample shall <br />be collected, analyzed, and reported on the appropriate DMR. In addition, corrective action shall be taken immediately <br />to mitigate the discharge of oil and grease. A description of the corrective action taken should be included with the <br />DMR. <br />C. DEFINITIONS OF TERMS <br />1. "Acute Toxicity" means there shall be no acute toxicity in the effluent from this discharge point. The acute toxicity limitation <br />is exceeded if 1) a statistically significant difference in mortality (at the 95% confidence level) is observed for either species <br />between the control and any dilution less that or equal to the identified IWC or 2) a species mortality in any dilution of <br />effluent (including 100% effluent) exceeds 50%. <br />2. "Chronic lethality" occurs when a statistically significant difference, at the 95% confidence level, occurs in the chronic test <br />between the mortality of the test species in 75% effluent (the chronic IWC = 75%) and the control. <br />• 3. "Composite" sample is a minimum of four (4) grab samples collected at equally spaced two (2) hour intervals and <br />proportioned according to flow. <br />4. "Continuous" measurement, is a measurement obtained from an automatic recording device which continually measures <br />provides measurements.