Agenda - 05-22-1989 - Laserfiche WebLink

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. ■ • Service lines from the pump basin Elevated Drain Fields- In this situa- to the street are usually 1-if" ID. tion, the soil conditions near the Type I Schedule 40 PVC solvent welded home are not acceptable for a drain pipe. Force mains will normally be field. Consequently, the effluent is SDR-26 and SEMI PVC pipe with pumped to another location on the elastomeric sealed joints running property which has acceptable soil anywhere from 1-W' to 6" I.D. in conditions. size, depending on the number of Alternate Drain Fields- In this case. house connections. Occasionally, one drain field is not quite adequate polyethylene pipe is used for the for proper field disposal. A second force mains,especially in extremely drain field is installed and the two cold climates, fields are alternated by using a valve and a STEP pump. Cluster Concept-In this application. Septic tank effluent flowing from a STEP pressure sewer can be dis- a cluster of several homes will install charged to a gravity manhole, treat- septic tanks and STEP pumps. The ment plant, lagoon or large drain effluent is then pumped by a field. However, if discharging to a common force main to a drain field gravity manhole, care must be taken located some distance from the to handle potential odor and corro- individual homes. sion problems generating from septic Dosing Fields - In this application, tank effluent. Due to the reduction it has been shown that the effluent in organic and hydraulic loadings, from the septic tank may not flow the cost of treatment would be lower properly by gravity throughout the in comparison to conventional gravity drain pipe.By installing a STEP pump flow, the drain field is dosed by pressure generated by the pump insuring that APPLICATIONS FOR the effluent reaches the entire drain field. EFFLUENT PUMPS In pressure sewer applications we There are basically two markets for normally define a pressure sewer as STEP pumps. One is referred to as a system containing at least 25 pumps onesy-twosy(OT)applications.Here, discharging into a common force we mean that only one or a few main.Most residential STEP pressure STEP pumps will be installed in a sewers are designed with one pump given application.The other market per home.In some pressure systems area is pressure sewer applications, there will be multiple residential con- Specific STEP applications in the nections to one simplex or duplex OT market would be as follows: STEP pump. Apartments/Condos Trailer Parks Due to the administrative problems Schools Small Office . Small Motels - Buildings . of who pays for power,where power Interstate Rest Small Hospitals is connected,obtaining right-Of-ways, Stops .. Homes etc.. the majority of STEP pressure Individual Homes Campgrounds - sewers being installed are using one Intermediate Pump State and Federal Stations Parks . pump per home. The decision on Restaurants Industrial Plants single or multiple pump connections will be up to the design engineer The OT applications for effluent . .and his client based on their specif- pumps differs from grinder pump . . , lc needs. Specific applications for applications as they would relate to discharge.In OT grinder applications STEP pressure sewers are: the sewage is, in most cases, being discharged to a collection system •Small rural communities and ultimately to a treatment plant. -Trailer parks In STEP OT applications,the effluent •Permanent RV campgrounds •Outer suburbs is usually being discharged to a . •Isolated pockets within cities(low lying drain field. areas) •Recreational lake developments Over the past several years, there . •Apanments and condo complexes have been a number of OT STEP •irehistriai plant complexes •Serail variable gravity sewers applications that have been developed that utilize an effluent pump. Some typical examples are: - - 2 ■ ---EliAIG B.MORGAN AND ASSOCIATES;P.A. • 1 • 1 .