December 1998 G1 General Engi ineering Requirements This chapter describes ecology' s engineering approval requirements, permitting requirements and the agencies involved, and the process and steps involved from planning through completion of construction for a domestic wastewater collection and treatment facility. General and site specific planning design, construction, and operation and maintenance requirements are all addressed in Chapter Gl. Exceptions and variations to the normal review and pproval process are also discussed in this chapter Except as delegated to local units of government(see G1-5.2), Ecology will review general sewer plans, engineering reports, plans and specifications, and operation and maintenance manuals for domestic wastewater facilities. The purpose of Ecology's review is to ascertain that the proposed facilities will be designed, constructed, operated, and maintained to meet the effluent limitations and other wastewater discharge permit terms and conditions necessary to protect public health and the environment. The policies for providing this protection are established in Chapters 90.48, 90.52, and 90.54 RCW pertaining to the prevention and control of pollution to state waters. In cases where projects are funded through state and federal grant and/or loan programs Ecology's review will also consider the efficient and effective use of public resources In addition, Ecology will review documents to ascertain that plans are consistent with the design standards and intentions established in this manual and with commonly accepted engineering practices G1-1 Agreements with other B. Wastewater Reclamation and reuse Agencies and Applicable C. On-Site Sewage Systems 6 Permitting Requirements. 4 D Separation Between Water Lines and G1-11 Objective Gl-1 4.2 Department of Fish and Wildlife G1-12 General Information on G1-1.4.3 Parks and Recreation Commission...7 Application and Permitting Gl-1 4.4 Department of Natural Resources Activities Gl-1.4.5 Community, Trade, and Economic Development G1-13 Federal Agencies... Gl-1.4.6 Department of Ecology 1-1.3. 1 Environmental Protection Agency A National Pollutant Discharge Gl-1.3.2 Federal Emergency Management limination System(NPDES)Permit..8 enc B State Waste Discharge Permit Gl-1.3.3 Corps of Engineers G1-1.3.4 Federal Executive Orders C Water Quality Certification (401 Certification) G1-14 State Agencies.…… D Stormwater Discharges from Gl-1 4.1 Department of Health Construction Sites A Review of Proposals for Wastewater E Dam Safety Evaluation of Lagoon Facilities EmbankmentsDecember 1998 G1-1 G1 General Engineering Requirements This chapter describes Ecology’s engineering approval requirements, permitting requirements and the agencies involved, and the process and steps involved from planning through completion of construction for a domestic wastewater collection and treatment facility. General and site specific planning, design, construction, and operation and maintenance requirements are all addressed in Chapter G1. Exceptions and variations to the normal review and approval process are also discussed in this chapter. Except as delegated to local units of government (see G1-5.2), Ecology will review general sewer plans, engineering reports, plans and specifications, and operation and maintenance manuals for domestic wastewater facilities. The purpose of Ecology’s review is to ascertain that the proposed facilities will be designed, constructed, operated, and maintained to meet the effluent limitations and other wastewater discharge permit terms and conditions necessary to protect public health and the environment. The policies for providing this protection are established in Chapters 90.48, 90.52, and 90.54 RCW pertaining to the prevention and control of pollution to state waters. In cases where projects are funded through state and federal grant and/or loan programs, Ecology’s review will also consider the efficient and effective use of public resources. In addition, Ecology will review documents to ascertain that plans are consistent with the design standards and intentions established in this manual and with commonly accepted engineering practices. G1-1 Agreements with Other Agencies and Applicable Permitting Requirements.... 4 G1-1.1 Objective .......................................4 G1-1.2 General Information on Application and Permitting Activities .......................................4 G1-1.3 Federal Agencies..........................4 G1-1.3.1 Environmental Protection Agency ......... 4 G1-1.3.2 Federal Emergency Management Agency ........................................................... 4 G1-1.3.3 Corps of Engineers................................. 5 G1-1.3.4 Federal Executive Orders....................... 5 G1-1.4 State Agencies..............................5 G1-1.4.1 Department of Health............................. 5 A. Review of Proposals for Wastewater Facilities.................................................... 5 B. Wastewater Reclamation and Reuse............ 6 C. On-Site Sewage Systems............................. 6 D. Separation Between Water Lines and Sanitary Sewer Lines ................................ 6 G1-1.4.2 Department of Fish and Wildlife............ 7 G1-1.4.3 Parks and Recreation Commission......... 7 G1-1.4.4 Department of Natural Resources .......... 7 G1-1.4.5 Community, Trade, and Economic Development .................................................. 7 G1-1.4.6 Department of Ecology .......................... 8 A. National Pollutant Discharge Elimination System (NPDES) Permit ....... 8 B. State Waste Discharge Permit ..................... 8 C. Water Quality Certification (401 Certification) ............................................. 8 D. Stormwater Discharges from Construction Sites ..................................... 8 E. Dam Safety Evaluation of Lagoon Embankments............................................ 9