4.4. SR 03-20-2017 - Laserfiche WebLink

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Permit Modified. October 16, 2414 Elft River WWTF Page I6 Permit Expires: June 30, 2018 Permit #: MN0020788 Chapter 5. Surface Discharge Stations 3. Surface Discharges 3.1 bloating solids or visible foam shall not be discharged in other than trace amounts. 3.2 Oil or other. substances shall not be discharged in amounts that create a visible color film. 3.3 The Permittee shall install and maintain outlet protection measures at the discharge stations to prevent erosion.. 4. Phosphorus Limits and Monitoring Requirements 4.1 Phosphorus limits are to be calculated as follows. 4.2 "12 -Month Moving Average" is a rolling average. To calculate, add all of the monthly average values during the last 12 months and divide by 12. 4.3 "12 -Month Moving Total" is a rolling. total. To calculate, for each month multiply the total volume of effluent flow (MG) by the monthly average concentration and by a 3.785 conversion factor to get kg/month. Then add all of the monthly values (kg/mo) during the last twelve months, starting with the monthly total for the month of the current reporting period. 4.4 "12 -Month Moving Average" is a rolling average. For the first 11 months after this limit becomes effective, add all of the monthly average values starting with the first full month the final limit became effective and divide by the number of months since that same date. This value should be reported on the eDMR in the 12 -Month Moving Average field. If using the eDMR calculator tool, replace the calculated value with this value. Starting the 12th month after this limit became effective and thereafter, add all of the monthly average values during the last 12 months and divide by 12. Starting the 12th month after this limit became effective and thereafter, the eDMR calculator tool will provide the correct value for this limit. 4.5 "12 -Month Moving Total" is a rolling total. For the first 11 months after this limit is effective, report the mass phosphorus discharged by calculating each month's kg/month, then adding each month's kg/month from the first month the new limit is effective through the 11th month after this limit became effective. This value should be reported on the eDMR in the 12 -Month Moving Total field. If using the eDMR calculator tool, replace the calculated value with this value. Starting the 12th month after this limit became effective and thereafter, calculate each kg/month then add all of the monthly values (kg/mo) during the last twelve months, starting with the monthly total_ for the month of the current reporting period. Calculate kg/month for each month by multiplying the total volume of effluent flow (MG) by the monthly average concentration and by a 3.785 conversion factor to get kg/month. Starting the 12th month after this limit became effective and thereafter, the eDMR calculator tool will provide the correct value for this limit. S. Mercury Limits and Monitoring .Requirements 5.1 Permittees are required to sample for TSS (grab sample) at the same time that Total/Dissolved Mercury samples are taken. Total Mercury, Dissolved Mercury, and TSS (grab sample) samples must be collected via grab samples. All results must be recorded on DMRs. 5.2 Total and Dissolved Mercury samples must be analyzed using the most current versions of EPA Method 1631 with clean techniques method 1669. Should another mercury analytical method that has a reportable quantitation level of <0.5 nglL that allows for low-level sample characterization be approved by the EPA and certified by an MPCA recognized accreditation body, the method may be used in place of 1631/1669. 6. Nitrogen Limits and Monitoring Requirements 6.1 "Total Nitrogen" is to be reported as the summation of the Total Kjeldahl Nitrogen and Total Nitrite + Nitrate Nitrogen values.