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PART <br />Page 7 <br />Permit No. COG - 603000 <br />coverage under an individual permit as needed to implement more stringent site - specific groundwater standards. Certain <br />discharges, due to proximity to alluvial water associated with nearby surface flow, are considered to be hydrologically <br />connected to this surface flow and will be considered a discharge to surface water, If a permittee desires to discharge to <br />ground water via approved means, the permittee shall demonstrate in the application by what method effluent will be <br />discharged to ground water, and how and where effluent can be monitored prior to discharge to ground water. All <br />applicable effluent limitations will be met prior to application to the land. <br />L Additional Monitoring — The Division reserves the right to request monitoring of additional pollutants to measure the <br />effectiveness of Best Management Practices (BMP's) in removing pollutants in the effluent (see Part I.B.3. of this permit). <br />Such monitoring shall be implemented, where appropriate, as described in the facility's certification. <br />3. Best Management Practices <br />The permittee may need to implement and maintain Best Management Practices to meet effluent limits for the prevention of <br />erosion and the control of solid and liquid pollutants in the discharge. <br />BMPs include various options, such as: modification of the pipe discharge structure to disperse flows; containment of water by <br />hay bales or other comparable structures; the use of geocloth, filter fabric, or plastic sheeting for protection of containment <br />structures; rip -rap; and/or any other approved methods. <br />4. Other Site - specific Conditions <br />Specific permit conditions may be applied for compliance with any Division compliance order on consent, cease and desist <br />order, or an EPA administrative order, or similar decree promulgated by the Division, EPA, or other regulatory authority. <br />C. DEFINITIONS <br />1. A "composite" sample, for monitoring requirements, is a minimum of four (4) grab samples collected at equally spaced two (2) <br />hour intervals and proportioned according to flow. <br />2. A "continuous" measurement, for flow monitoring requirements, is a measurement obtained from an automatic recording device, <br />which continually measures flow. <br />3. "Daily Maximum limitation" means the limitation for this parameter shall be applied as an instantaneous maximum (or, for pH or <br />DO, instantaneous minimum) value. The instantaneous value is defined as the analytical result of any individual sample. DMRs <br />shall include the maximum (and/or minimum) of all instantaneous values within the calendar month. Any instantaneous value <br />beyond the noted daily maximum limitation for the indicated parameter shall be considered a violation of this permit. <br />4. "Dissolved (D) metals fraction" is defined in the Basic Standards and Methodologies for Surface Water 1002 -31, as that <br />portion of a water and suspended sediment sample which passed through a 0.40 or 0.45 UM (micron) membrane filter. <br />Determinations of "dissolved" constituents are made using the filtrate. This may include some very small (colloidal) <br />suspended particles which passed through the membrane filter as well as the amount of substance present in true chemical <br />solution. <br />5. A "grab" sample, for monitoring requirements, is a single "dip and take" sample. <br />6. An "in- situ" measurement, for monitoring requirements, is a single reading, observation, or measurement performed on site. <br />7. "Potentially dissolved (PD) metals fraction" is defined in the Basic Standards and Methodologies for Surface Water 1002 -31, <br />as that portion of a constituent measured from the filtrate of a water and suspended sediment sample that was first treated <br />with nitric acid to a pH of 2 or less and let stand for 8 to 96 hours prior to sample filtration using a 0.40 or 0.45 -UM (micron) <br />membrane filter. Note the "potentially dissolved" method cannot be used where nitric acid will interfere with the analytical <br />procedure used for the constituent measured. <br />8. A "quarterly sample" shall be collected during March, June, September and December, if a continual discharge occurs. If the <br />discharge is intermittent, then samples shall be collected during the period that discharge occurs. <br />9. "Salinity" is measured as Total Dissolved Solids (TDS). Where based on a minimum of 5 samples, the permittee demonstrates a <br />correlation to the satisfaction of the Division that the level of TDS in the effluent can be calculated based upon the level of <br />electrical conductivity, the permittee may measure and report salinity in terms of electrical conductivity. <br />