Plans com­ing to keep stormwa­ter out of san­i­tary sew­ers

The Times Herald (Norristown, PA) - - LOCAL - By CARL ROTEN­BERG

WEST NOR­RI­TON — West Nor­ri­ton of­fi­cials are de­vel­op­ing long-range plans to re­duce the “in­flow and in­fil­tra­tion” (I&I) of stormwa­ter into sewer pipes and re­duce the fu­ture sewage treat­ment vol­umes at the Nor­ris­town sewage treat­ment plant.

The Novem­ber 2013 san­i­tary sewer sys­tem in­flow and in­fil­tra­tion study pre­pared by Rettew As­so­ci­ates of Lancaster was a first step to­ward re­duc­ing the I&I prob­lems. The study was re­cently made pub­lic and was placed on the West Nor­ri­ton town­ship web­site at www.west­nor­ri­ton­twp.org.

“The com­par­isons of the to­tal flow to Nor­ris­town,” the study said, “in­di­cates that ap­prox­i­mately 13 per­cent of the sewage flow is due to in­flow and in­fil­tra­tion, based on the com­puter mod­el­ing.”

The study iden­ti­fied four road­ways and ar­eas of the town­ship where sewer lines, man­holes and leaky sewer lat­er­als from res­i­den­tial homes need remedial work to re­duce the I& I prob­lems.

At the top of the re­pair list were 14 man­holes on Mys­tic Lane where the source of the I&I in­cluded stormwa­ter “flow into man­hole lids, sewer vents and into the man­holes through the stone sub­base of the road­way sur­face,” the re­port said.

A seven-man­hole sewer line run in School Lane had stormwa­ter leaks caused by ex­te­rior drain con­nec­tions, low-ly­ing sewer vents, stormwa­ter flow into man­hole lids, wa­ter leaks through the sub­base of the macadam road­ways into man­holes and in­fil­tra­tion into the sewer pipe.

The area from Burn­side Av­enue to Trooper Road, on each side of Oakland Drive, had stormwa­ter from ex­te­rior drain con­nec­tions into sewer lat­er­als, stormwa­ter sur­face wa­ter flow­ing di­rectly through man­hole lids, through the sub­base of road­ways into man­holes and bro­ken sewer lat­er­als.

The sewer lines flow­ing into the White­hall Road Pump Sta­tion had stormwa­ter in­fil­tra­tion from ex­te­rior drain con­nec­tions, low sewer vents, leaky man­hole lids, in­fil­tra­tion into the sewer lines and leaky man­holes, the re­port said.

The town­ship owns 17 sewer flow me­ters that are col­lect­ing flow data used to gen­er­ate the Novem­ber 2013 study.

Town­ship Man­ager Ja­son Bobst said town­ship of­fi­cials and the sewer con­sul­tant, Christo­pher Fraw­ley, were pre­par­ing a phased, five to seven-year plan to re­pair sewer lines and man­holes that would be pre­sented to the Board of Com­mis­sion­ers at the March meet­ing.

“We’re go­ing to flesh out the rec­om­men­da­tions and put to­gether a mul­ti­year plan to ad­dress the prob­lems,” Bobst said. “We are not go­ing to get all this done in a year or two years. You have to plot out the pri­or­i­ties.”

Bobst said that the sewer mains un­der Mys­tic Lane and School Lane would be tele­vised this spring to de­ter­mine which sec­tions need to be re­placed and which sec­tions can be slip-lined to elim­i­nate I&I.

“We hope to do that work in the spring­time. Then we will de­sign the so­lu­tion in the sum­mer and per­haps do the work in the fall,” Bobst said. “Mys­tic Lane could have ground­wa­ter in­fil­tra­tion from a (nearby) stormwa­ter basin.”

Bobst es­ti­mated the tele­vis­ing work and engineering de­sign for the two projects would cost $200,000 to $250,000. He said re­pairs might to­tal $500,000. The town­ship has $3 mil­lion from pre­vi­ous sewer tap­ping fees to fi­nance the ini­tial re­pair work.

At the same time, the town­ship is pro­ceed­ing with two sewer re­pair projects for the For­est Av­enue pump sta­tion and the sewer line un­der Joseph Street. The re­pair costs were al­ready in­cluded in the 2014 bud­get.

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