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When developing ELGs, the EPA identifies the best available technology that is economically achievable for that industry and sets regulatory requirements based on the performance of that technology. The ELGs do not require facilities to install the specific technology identified by the EPA; however, the regulations do require facilities to achieve the same level of pollutant reductions. ELGs can apply to both existing dischargers and new dischargers. ELGs also establish different levels of control for specific classes of pollutants (priority pollutants, conventional pollutants and nonconventional pollutants). The direct discharge pollution control guidelines that are developed by the EPA in ELGs include: best practicable control technology currently available (BPT), best conventional pollutant control technology (BCT), best available technology economically achievable (BAT), and best available demonstrated control technology for new sources, or new source performance standards (NSPS). The analogous indirect discharge pollution control standards that are developed by the EPA in ELGs are pretreatment standards for existing sources (PSES) and pretreatment standards for new sources (PSNS). Table 3-2 illustrates the types of dischargers and the different levels of control in ELGs and Table 3-3 illustrates the classes of pollutants addressed by different levels of control in ELGs. Table 3-2. Applicability of Effluent Guidelines Levels of Control to Types of Discharger Existing Direct Dischargers New Direct Dischargers Existing Indirect Dischargers New Indirect Dischargers ● ● ● Section 3−Background A list of 126 toxic pollutants, last modified in 1981, that are frequently found in water samples, produced in significant quantities and have approved EPA methods for detection. Priority Pollutants Biochemical oxygen demand, total suspended solids, fecal coliform, pH and oil and grease. Conventional Pollutants Nonconventional Pollutants All other pollutants not considered priority or conventional pollutants. Type of Discharger Regulated BPT BCT BAT NSPS PSES PSNS ● ● ● Table 3-3. Pollutant Classes Regulated by Effluent Guidelines Levels of Control ● ● ● Study of Oil and Gas Extraction Wastewater Management 10 Priority Pollutants ● ● Pollutants Regulated BPT BCT BAT NSPS PSES PSNS Conventional Pollutants ● ● Nonconventional Pollutants ● ● ● ● ● ● Discharges from oil and gas extraction facilities are subject to ELGs at 40 CFR Part 435. These regulations are subcategorized (onshore, offshore and in coastal areas), and the levels of control vary for each subpart. Table 3-4 shows the levels of control that arePDF Image | Study of Oil and Gas Extraction Wastewater
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