Agenda - 01-04-1988 - Laserfiche WebLink

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0 ._--2-i 36 ment plant by overloading the chanical equipment which will treatment system due to the heavy have to be serviced in perpetuity. inflows. In the case of pressure This is especially true when an 0 sewers, infiltration is virtually individual pump system is installed eliminated due to the design of a at each home. However, a STEP 4 tight system throughout. pump can be looked upon as H. Service Connections - In older communities, the septic tanks are another appliance and is subject to the same ongoing service • usually located in back of homes requirements as a home furnace, with the house plumbing oriented refrigerator, hot water heater, etc. to the back.This can create a prob- Obviously, with the amount of lem of installing a gravity sewer equipment involved, it is important line to the street without changing to have a service capability estab- the house plumbing. On the other lished to handle it. This can be hand, the STEP system will utilize done by a service department the old septic tank or replace it within the sewer authority, or local with a new one. The service line service center established by the can be laid around the house to manufacturer or local pump the street at a minimum cost using representative. • small diameter PVC pipe. B: Power Outages-With the holding 1.Treatment Plant Size- If the treat- capacity of the pump basin and ment plant is being designed to the freeboard area of the septic handle flow from a pressure sewer tank, the homeowner has in system only, the size can be excess of 24 hours storage reduced over normal design require- capacity, if the power goes off. merits due to the elimination of Since the national average power infiltration and inflow, outage is around 2 hours this will J. Water Conservation -Since water provide adequate storage unless conservation is gaining a great the power is off for several days. 3 deal of attention in many parts of Hopefully, the homeowner would the country, the value of pressure refrain from washing clothes and • sewers in this regard becomes an . taking showers during this time important consideration. 6y elim- frame to minimize any problems, import infiltration and inflow, the With a gravity collections system, amount of water polluted is re- the homeowner can continue to duced considerably,Since no man- use the sewage system assuming i holes are used in pressure sewers, standby power is available to the drain wastewater from wash- operate the pumping stations and frig cars and lawn watering doesn't potable water is still available. end up being polluted by the C. Power Costs - With the ongoing domestic sewage and is returned increase in power costs, a home- • in part to the water table, owner is concerned about any K. Land Planning - Public officials equipment that will increase his ) in rural areas can limit the amount electric bill by any substantial of population expansion in a corn- amount. Since a simplex STEP aver- l munity by the amount of potential pump only operates on the , the growth that is sized into the prey- age of 10-15 minutes a day, the sure sewer mains. This alleviates - annual power cost will be under some of the fear of rapid growth $10.00 a year, based on an aver- if gravity sewers are installed: age kilowatt per hour cost of six I Since pressure sewers are more cents. adaptable to hilly, rocky and high D.Aesthetics of System - Some water table areas. the developer homeowners are concerned about 1 has more flexibility in laying out the appearance of the equipment - his lots for maximum lot-sales in their yard. Since the with basin dollars in comparison to some cover is buried flush with the restrictions with gravity. ground, it is difficult to notice from the road.Control panels with alarms DISADVANTAGES OF are attached to the sides of the EFFLUENT PRESSURE home,making them inconspicuous SEWERS VERSUS GRAVITY except if visual or audio alarm is activated. The homeowner may A.Mechanical Equipment-Probably also be concerned about the the major concern of installing a damage to the premises when in- pressure sewer system is the ad- stalling the basin and service line. dition of a large amount of me- N. 5 •CFU+IG E.MORGAN AND ASSOCIATES.P.A.• /