Industrial Stormwater Discharge Parameters

Industrial dischargers must provide information on the following parameters, as required in 40 CFR 122.26(c)(1)(i)(E):

• Any pollutant limited in an effluent guideline to which the facility is subject

• Any pollutant listed in the facility’s NPDES permit for its process wastewater (if the facility has an existing NPDES permit)

• Oil and Grease (O&G ), pH, BOD5, COD, TSS, total phosphorus, Total Kjeldahl nitrogen (TKN), and nitrate plus nitrite nitrogen

• Any pollutant known or believed to be present [as required in 40 CFR 122.21(g)(7)]
  

• Flow measurements or estimates of the flow rate, the total amount of discharge for the storm events sampled, and the method of flow measurement or estimation

• The date and duration (in hours) of the storm event sampled, and rainfall measurements

or

• Estimates of the storm event (in inches) which generated the sampled runoff, and the time between the storm event sampled and the end of the previous measurable (greater than 0.1 inch rainfall) storm event (in hours)

For stormwater samples collected and described under 40 CFR 122.26(d)(2)(iii) (A)(1) and (A)(2), permittees should provide quantitative data for: the organic pollutants listed in Table II; the pollutants listed in Table III (toxic metals, cyanide, and total phenols) of Appendix D of 40 CFR part 122, and for the following pollutants:

• Total suspended solids (TSS)

• Total dissolved solids (TDS)

• COD

• BOD5

• Oil and grease

• Fecal coliform

• Fecal streptococcus

• pH

• Total Kjeldahl nitrogen

• Nitrate plus nitrite

• Dissolved phosphorus

• Total ammonia plus organic nitrogen

• Total phosphorus

Copyright @ January,2005 Prepared by Transportation Environmental Resource Center (TERC)