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Provides engineering criteria for pressurized common collectors and small-diameter gravity collectors, explains key system types, and sets scope and administrative requirements for review and approval under OAR 340-52, including roles of the owner and user, and limits on what systems are covered.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/healthcare/","Healthcare",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/engineering-plan-review-deq-stepsteg-design-guidelines/648471/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/engineering-plan-review-deq-stepsteg-design-guidelines/648471.png","ImageObject",300,407,{"name":42,"@type":43},"WPS_1786070896","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-11-12","2026-10-23",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",11,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What types of STEP/STEG systems do these guidelines apply to?","Question",{"text":63,"@type":64},"They apply to STEP units discharging to pressurized common sewers and STEP or STEG units discharging to small-diameter common collector sewers, where hydraulic interaction and solids-handling limits require comprehensive design.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"What systems are explicitly excluded from the STEP/STEG criteria?",{"text":68,"@type":64},"Excluded are individual or single-dwelling septic tank or grinder pump units discharging to conventional common gravity sewers, tanks discharging to drainfields or other on-site disposal systems, and vacuum sewer collection systems.",{"name":70,"@type":61,"acceptedAnswer":71},"Who are the OWNER and USER, and what are the administrative expectations?",{"text":72,"@type":64},"The OWNER is the municipality, sanitary district, private sewage utility, or sanitary authority operating the system; the USER is the served property. 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This information is intended as guidance for wastewater collection owners and should be interpreted and used in a manner fully consistent with the state’s environmental cleanup laws and implementing rules. This document does not constitute rulemaking by the Oregon Environmental Quality Commission and may not be relied on to create a right or benefit, substantive or procedural, enforceable at law or in equity, by any person, including Oregon Department of Environmental Quality (ODEQ ) employees.  \nDo You Have Comments or Suggestions for Improving this Guidance? Please let us know! Please contact an ODEQ plan review engineer at one of the offices listed below:  \nNorthwest Region Offices  \nMichael Pinney, MS, PE  \n2020 SW 4th Ave., Suite 400 Portland, OR 97201 Phone: 503-229-5310  \nFax: 503-229-6945  \nTTY: 503-229-5471  \nWestern Region Offices  \nTim McFetridge, PE  \n750 Front St NE, \\#120 Salem, OR 97301-1039 Phone: 503-378-4995 Toll free in Oregon: 800- 349-7677  \nFax: 503-373-7944  \nTTY: 503-378-3684  \nJon Gasik, MS, PE  \n221 Stewart Ave., Suite 201 Medford, OR 97501 Phone: 541-776-6242  \nFax: 541-776-6262  \nToll free in OR: 877-823-  \nEastern Region Offices  \nHeidi Williams, PE  \n700 SE Emigrant, \\#330 Pendleton, OR 97801 Phone: 541-276-4063 1-800-304-3513  \nFax: 541-278-0168  \nTable of Contents  \n1. Applicability  \n2. Types of Step Systems  \n3. Scope  \n4. Administrative Requirements  \n5. Design Submittlas  \n6. Tanks and Inlet Piping  \n7. Pumps and Outlet Pumping  \n8. Pump Controls  \n9. Common Pressure Sewers  \n10. Common Small-Diameter Gravity Sewers  \n11. Sulfide Control  \n12. Construciton  \n13. Engineer's Certification  \n14. Inquiries  \n1. APPLICABILITY  \nThese criteria apply to STEP (septic tank effluent pump) units discharging to pressurized common sewers, and to STEP or STEG (septic tank effluent gravity-draining) units discharging to small-diameter common collector sewers. Pressurized and small-diameter collectors have interactive hydraulic effects and solids handling limitations which warrant a comprehensive engineering design.  \nApproval of these designs, unlike gravity sewers, has not been delegated under OAR 340-52-045.  \nThese criteria do not apply to the following:  \n1. Individual or single-dwelling septic tank or grinder pump units discharging directly to a conventional common gravity sewer. Their design, review, inspection, and approval are subject to regulations of the State Building Codes Agency.  \n2. Tanks discharging to a drainfield or other on-site disposal system. They are subject to design, review, inspection, and approval as established in our on-site sewage disposal rules (OAR 340-71, 72, & 73) .  \n3. Vacuum sewer collection systems. Technical features should conform with  \nrecommendations in the literature. Administrative requirements for vacuum sewers are similar to those listed below for STEP systems.  \n2. TYPES OF STEP SYSTEMS  \nIn a typical STEP system, household sewage is pretreated in a septic tank where gross solids and grease are held back. A \"clear\" effluent from the mid-depth of the tank is conveyed to a common sewer. Usually the effluent is pumped from the septic tank under pressure to a small-diameter, pressurized collector sewer.  \nEffluent may also flow by gravity, where terrain allows, to small-diameter gravity collector lines. This type of STEP system is often called a STEG (septi","cbCaihIruAzhRu84","https://ap.wps.com/l/cbCaihIruAzhRu84","pdf",284113,14,"English","# Applicability\n## Types of Step Systems\n## Scope\n## Administrative Requirements\n## Design Submittlas\n## Tanks and Inlet Piping\n## Pumps and Outlet Pumping\n## Pump Controls\n## Common Pressure Sewers\n## Common Small-Diameter Gravity Sewers\n## Sulfide Control\n## Construciton\n## Engineer's Certification\n## Inquiries","[{\"question\":\"What types of STEP/STEG systems do these guidelines apply to?\",\"answer\":\"They apply to STEP units discharging to pressurized common sewers and STEP or STEG units discharging to small-diameter common collector sewers, where hydraulic interaction and solids-handling limits require comprehensive design.\"},{\"question\":\"What systems are explicitly excluded from the STEP/STEG criteria?\",\"answer\":\"Excluded are individual or single-dwelling septic tank or grinder pump units discharging to conventional common gravity sewers, tanks discharging to drainfields or other on-site disposal systems, and vacuum sewer collection systems.\"},{\"question\":\"Who are the OWNER and USER, and what are the administrative expectations?\",\"answer\":\"The OWNER is the municipality, sanitary district, private sewage utility, or sanitary authority operating the system; the USER is the served property. Administrative requirements emphasize OWNER responsibility for design and operation, including complete control of key components on private property, and review/approval of additions, extensions, and new systems per OAR 340-52.\"}]","Engineering Plan Review - DEQ STEP/STEG Design Guidelines | PDF",1792793660,35]