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State of Oregon <br /> Department of Environmental Quality Guidelines <br /> Guidelines for Design of Septic Tank Effluent Pump or Gravity(STEPlSTEG)Sewer Projects Involving Common Seivers <br /> APPLICABILITY <br /> TYPES OF STEP SYSTEMS <br /> SCOPE <br /> ADMINISTRATIVE REQUIREMENTS <br /> DESIGN SUBMITTALS <br /> TANKS AND INLET PIPING <br /> PUMPS AND OUTLET PIPING <br /> PUMP CONTROLS <br /> COMMON PRESSURE SEWERS <br /> COMMON SMALL-DIAMETER GRAVITY SEWERS <br /> SULFIDE CONTROL <br /> CONSTRUCTION <br /> ENGINEER'S CERTIFICATION <br /> INQUIRIES <br /> APPLICABILITY <br /> These criteria apply to STEP(septic tank effluent pump)units discharging to pressurized common sewers,and to STEP or STEG <br /> (septic tank effluent gravity-draining)units discharging to small-diameter common collector sewers.Pressurized and small-diameter <br /> collectors have interactive hydraulic effects and solids handling limitations which warrant a comprehensive engineering design. <br /> Approval of these designs,unlike gravity sewers,has not been delegated under OAR 340-52-045. <br /> These criteria do not apply to the following: <br /> 1.Individual or single-dwelling septic tank or grinder pump units discharging directly to a conventional common <br /> gravity sewer.Their design,review,inspection,and approval are subject to regulations of the State Building Codes <br /> Agency. <br /> 2.Tanks discharging to a drainfield or other on-site disposal system.They are subject to design,review,inspection, <br /> and approval as established in our on-site sewage disposal rules(OAR 340-71,72,&.73). <br /> 3.Vacuum sew <br /> f <br /> at collection systems.Technical features should conform with recommendations in the literature. <br /> Administrative requirements for vacuum sewers are similar to those listed below for STEP systems. <br /> 4¢ TYPES OF STEP SYSTEMS <br /> 6 <br /> I <br />