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Note: This information is provided for reference purposes only. Although the information provided here was accurate and current when first created, it is now outdated. All the links in the document have been removed. |
Analytical monitoring is required only for the industry sectors or sub-sectors which were determined to have a high potential to discharge a pollutant at concentrations of concern. Monitoring provides feedback to the facility operator to assess the effectiveness of the facility's storm water pollution prevention plan. Which Pollutants Need To Be Monitored?The Analytical Monitoring Table identifies specific parameters that must be monitored for each industry sector or sub-sector required to perform analytical monitoring of their storm water discharges. In addition to the requirements listed in this section, facilities must also comply with any state-specific and Regional requirements as listed in Part XII of the MSGP. When Does Analytical Monitoring Need to be Performed?Analytical monitoring must be performed on a quarterly basis in years two and four of the permit. The second and fourth years of the MSGP do not correspond to calendar years, and they differ from region to region.
|
Parameter |
Benchmark Level (mg/l unless otherwise noted) |
Parameter |
Benchmark Level (mg/l unless otherwise noted) |
Aluminum, Total Recoverable |
0.75 |
Mercury, Total Recoverable |
0.0024 |
Ammonia |
19.0 |
Nitrate + Nitrite Nitrogen |
0.68 |
Arsenic, Total Recoverable |
0.16854 |
Nitrogen, Total Kjeldahl |
1.5 |
Biological Oxygen Demand (BOD5) |
30 |
Oil & Grease |
15 |
Cadmium, Total Recoverable |
0.0159 |
pH |
6.0 to 9.0 s.u. |
Chemical Oxygen Demand (COD) |
120.0 |
Phosphorous |
2.0 |
Copper, Total Recoverable |
0.0636 |
Selenium, Total Recoverable |
0.2385 |
Cyanide, Total |
0.0636 |
Silver, Total Recoverable |
0.03818 |
Iron, Total Recoverable |
1.0 |
Total Organic Carbon (TOC) |
50 |
Lead, Total Recoverable |
0.0816 |
Total Suspended Solids (TSS) |
100 |
Magnesium, Total Recoverable |
0.0636 |
Zinc, Total Recoverable |
0.117 |
Upon completion of each monitoring year, analytical monitoring results must be submitted on a Discharge Monitoring Report (DMR) form (and DMR form instructions) to the appropriate NPDES Permitting Authority authority by March 31 of the following year. For more information, please download the Guidance Manual for the Monitoring and Reporting Requirements of the NPDES Storm Water Multi-Sector General Permit.
Disclaimer: The
information contained on these pages is a general statement of
policy. It does not establish or affect legal rights or obligations.
It does not establish a binding norm and is not finally
determinative of the issues addressed. Agency decisions in any
particular case will be made by applying the law and regulations to
the specific facts of the case. This applies to all pages in the
NPDES Storm Water Program web hierarchy
(https://www.epa.gov/owm/sw/...). |