The Sand and Gravel General Permit limits pollutants in discharges and requires monitoring of discharges to measure pollutant levels. Discharge Monitoring Reports are referred to as DMRs.
Per the 2016 Sand & Gravel General Permit most inactive sites are not required to submit quarterly DMRs.
|Discharge Monitoring Period:||DMR Due Dates:|
|October, November, December||January 30|
|January, February, March||April 30|
|April, May, June||July 30|
|July, August, September||October 30|
The permit requires monitoring for oil sheen on a daily basis when equipment operates and runoff occurs. This means that during the rainy season you may need to report for every day of the month. The online DMR form doesn't have a monthly No Oil Sheen detected button. This can make it time consuming to fill out the form for every day of the month even when you haven't observed any oil sheen. In order to simplify this reporting you can use two different methods: adding a note to your reporting or using the Excel import feature.
If you did not observe any oil sheen for the entire monitoring period. You can include a note at the monitoring point level that states that you monitored throughout the entire month for the presence of oil sheen and that no oil sheen was observed. Please include each month within the monitoring quarter.
For example, in the DMR below you would enter in the last day of the month for all three months in the quarter (1st red box in the picture below). Then in the Oil & Grease column next to the the Yes/No entry you would click on the box to add a note.
The note box appears in the picture below. Add in your observation of no sheen for the entire month. Please leave the reporting code blank. Do not add a no discharge reporting code.
Another way to input the oil and grease data quickly is to use the "Paste Data from Excel" option. This allows you to use an Excel spreadsheet to insert your date and a value of "0" for no Oil and Grease observed. Then you can fill down the dates and "0" value. You can copy and paste this information into your DMR and upload it. Follow the instructions on the Paste DMR Data From a Spreadsheet screen.
Even though DMRs are due quarterly, you may need to monitor on a quarterly, monthly, or twice-monthly basis. In addition, the online DMR form doesn’t have a monthly No Discharge button. This can make it hard to figure out how to fill out the form without accidentally creating violations. Below is guidance for reporting when there was no discharge. Note that "No Discharge" means there was no discharge to sample during the entire reporting period. Your monitoring program must be flexible enough to take into account there may not be sufficient water available for sampling on any given day. Providing alternative sampling times, perhaps based on the occurrence of rainfall events onsite, is a good way to avoid this shortcoming in a plan. Sampling practices must be flexible enough to take advantage of storm events when they happen.
If you have a ground water discharge, you may be required to report either monthly or quarterly, depending on the activities that discharge to the ground.
If you have a surface water discharge, you need to enter at least two monitoring events for every month – because all surface water discharges require twice-monthly turbidity monitoring.
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