The Environmental Protection Agency released a draft multi-sector general permit for Stormwater Discharges associated with industrial activity (MSGP). The proposed permit, issued under the Clean Water Act of 1972 ( 33 U.S.C. §1251 et seq.) National Pollutant Discharge Elimination System (NPDES) will replace the existing MSGP that expires on June 4, 2020. The renewed permit affects facilities in states and areas where the EPA is the NPDES permitting authority (Idaho, Massachusetts, New Hampshire, New Mexico, tribal lands, Puerto Rico, the District of Columbia, and most U.S. territories and protectorates). For those state agencies that have been delegated the authority to issue NPDES permits, the renewed permit will be used as a template that delineates the stormwater management practices and monitoring standards for thousands of industrial facilities. Brief History The first use of this Multi-Sector General Permit (MSGP) for managing industrial stormwater began in 1995, with renewals required every five years. EPA used the novel approach of issuing a blanket permit in an attempt to balance protection of the environment and provisions of the Clean Water Act without the burden of issuing thousands of individual permits to each industrial site. The provisions of permit are organized by industrial sector, broken down by the facility’s standard Industrial code (SIC). Incorporating the Recommendations of the National Academies of Sciences The draft permit incorporates many of the recommendations made by the National Academies of Sciences, Engineering, and Medicine (NASEM) . (See our previous blog on the report). The NASEM report calls for the EPA to utilize the best available science, relevant recent data, and technological advances to improve management of storm water from industrial sources. In addition to clarifications, simplifications, and streamlining to accommodate more electronic information submittals, the EPA reviewed and accepted many of the recommendations made by NSEM: EPA will establish “universal benchmark monitoring,” industry-wide monitoring parameters that include pH, total suspended solids (TSS), and chemical oxygen demand (COD). The NASEM report suggests these as “basic indicators of the effectiveness of stormwater control measures (SCMs) employed on site” for permit holders. These parameters would indicate potential issues of poor site management or improper implementation of SCM’s. EPA considered the NASEM recommendation to “periodically review and update sector-specific benchmark monitoring requirements” to incorporate new information that could also reflect industry sector-wide practices. The proposed permit requires that additional sectors conduct benchmark monitoring. NASEM recommended benchmark thresholds based on the latest toxicity criteria designed to protect aquatic ecosystems. EPA modified the benchmark threshold for cadmium, removed the thresholds for magnesium and iron, and is considering modification of benchmark thresholds for selenium, arsenic, and copper. (The EPA is seeking comments on modifications to selenium, arsenic, and copper thresholds.) NASEM recommended that the EPA allow and promote the use of composite sampling. The permit clarifies that composite sampling is acceptable for benchmark monitoring. NASEM recommended removing the waiver for a permittee to discontinue monitoring for the remainder of the permit term if four consecutive quarters of sampling data show parameters below the benchmark. The permit now requires quarterly sampling throughout the permit term. Benchmark monitoring will now be required for three additional sectors recommended by NASEM: Oil and Gas Extraction sector for ammonia, nickel, total recoverable lead, nitrate-nitrogen, total recoverable zinc, and hardness in addition to the universal benchmark parameters. Land Transportation and Warehousing sector for lead, mercury, and hardness in addition to the universal benchmark parameters. Ship and Boat Building and Repair Yards for total recoverable chromium, total recoverable copper, total recoverable lead, total recoverable nickel, total recoverable zinc, and hardness in addition to the universal benchmark parameters. EPA is also soliciting comments on whether to allow for a tiered monitoring scheme that includes an “inspection only” option for “low risk” facilities. Benchmark monitoring would not be required but EPA is considering a rigorous inspection protocol. The NASEM report made some substantive recommendations that the EPA decided not to accept: EPA declined to accept the NASEM recommendation to include nonindustrial facilities with activities similar to those currently required under the MSGP after reviewing the sectors already covered by the permit and by the discretion granted to the Director to add any facility discharging industrial stormwater. The EPA declined to implement the recommendation to collect monitoring data and establish new numerical effluent limitations on the performance of stormwater control measures, citing the paucity of rigorous industrial performance data and technical limitations. However, EPA requests comments on viable alternative approaches for characterizing discharges, quantifying pollutant concentrations, and assessing the effectiveness of stormwater control measures. The EPA reviewed its existing guidance on how to conduct visual and analytical monitoring and determined that updating and strengthening monitoring, sampling, and analysis protocols, as recommended by NASEM, was not necessary. Next Steps The draft permit was published in the Federal Register on March 2, 2020 Comments will be accepted until May 1, 2020. The EPA will consider the comments, make changes to the final permit, and are expected to issue the final permit shortly after. We can expect that the states using the federal permit as a template will be making modifications to the state counterparts as the permits come up for renewal.

The National Academies of Sciences, Engineering, and Medicine (NASEM) released a prepublication version of a report that reviews and makes recommendations for the next generation multi-sector general permit for Industrial Stormwater Discharges (NASEM, 2019, Improving the EPA Multi-Sector General Permit for Industrial Stormwater Discharges, Washington, DC, The National Academies Press, https://doi.org/10.17226/25355 ). The multisector permit, issued under the Clean Water Act of 1972 ( 33 U.S.C. §1251 et seq.) National Pollutant Discharge Elimination System (NPDES), forms the basis for stormwater management practices and monitoring at thousands of industrial facilities. A previous National Research Council report, Urban Stormwater Management in the United States (2009) found the industrial stormwater program suffering from “poor accountability and uncertain effectiveness at improving the quality of the nation’s waters” and recommended updating monitoring requirements and using more technologically advanced sampling protocols. A recent settlement agreement with EPA, industries, and environmental groups over the MSGP included a provision for NASEM to revisit the industrial stormwater program. Thus, this report is intended to be used by the EPA to when it proposes revisions in 2020, when the current permit term expires. The first use of this Multi-Sector General Permit (MSGP) for managing industrial stormwater through began in 1995, with renewals every five years. This approach to issuing a blanket permit is the EPA’s attempt to balance protection of the environment and provisions of the Clean Water Act without the burden of issuing thousands of individual permits to each industry site. The general permits are sector-specific and issued to industries at the state and federal level. The current MSGP for industrial stormwater covers, according to the report, more than 2,000 facilities nationwide. For states that manage their own NPDES discharge permit programs, the federal multisector permit sets the minimum requirements and serves as a template for many state agencies to implement their own versions. Some of the significant recommendations to the EPA may be of interest to permit holders: Establish industry-wide monitoring for pH, total suspended solids (TSS), and chemical oxygen demand (COD), “as basic indicators of the effectiveness of stormwater control measures (SCMs) employed on site” for all permit holders. These parameters would indicate potential issues of poor site management or improper implementation of SCM’s. Additional parameters would be added on a sector by sector basis. Implement a process to “periodically review and update sector-specific benchmark monitoring requirements” to incorporate new information that could also reflect industry sector-wide practices. While periodic reviews could result in additional sampling parameters, changes in industry practice, such as eliminating certain chemicals and processes, could reduce the sampling burden over time. Update the MSGP industrial-sector classifications to include nonindustrial facilities with activities similar to those currently required under the MSGP, such as school bus transportation facilities, fuel storage, and fueling facilities. Include the latest toxicity criteria protective of aquatic ecosystems. Collect monitoring data on the performance of SCMs to confirm their actual ability to attain the promised reduction in pollutants, and periodically review and revise them. Update and strengthen monitoring, sampling, and analysis protocols, including the potential addition of a training and certification program to ensure consistent, reliable quality of monitoring data. Allow and promote the use of composite sampling. This could significantly improve the monitoring of discharge events through the use of remote, automated composite sampling devices. Precipitation events can occur at any time and are not always easily predictable. Composite sampling techniques and more sophisticated equipment are available to not only provide more consistent and reliable data but have the advantage of being available during an entire stormwater discharge event. It is not difficult to envision a composite sampler with a controller connected wirelessly to meteorological instruments and flow monitors to select the time to begin interval sampling and notify the owner that the samples can be recovered. Remove the waiver for a permittee to discontinue monitoring for the remainder of the permit term if four consecutive quarters of sampling data show parameters below the benchmark. NASEM, instead, recommends shifting to annual sampling to ensure “appropriate stormwater management throughout the remainder of the permit term,” noting that given the “natural variability and the limitations of grab samples, substantial uncertainty is associated with using the average of only four stormwater samples” to waive monitoring for the remainder of the permit term. The EPA has not provided any indication as to which of these recommendations, if any, may be incorporated into the 2020 renewal. The settlement agreement with EPA, industries, and environmental groups requires the EPA to consider the recommendations within the report; however, the NASEM did not conduct any analysis of costs and benefits, which will likely affect the EPA’s analysis The draft permit is supposed to be available in November 2019. We'll provide updates as more information becomes available.

A periodic visit to the EPA list of states and territories that have adopted the hazardous waste generator improvement ruls.