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For frostproof ing pump discharge pipe place an envelope <br />of material with air space around pipe for insulation. Use <br />a rock envelope only with metal pipe. Pump discharge pipe <br />can be laid inside a larger pipe. Keep discharge pipe on <br />a grade back to pump. Allow no low spots in discharge <br />line. Polystyrene should be at least two feet wide. <br />Expanded <br />Polystyrene <br />Tamped <br />Fi I I Space <br />for Added <br />Backf i I I <br />With Foam <br />Protection <br />Insulation -/ / Pump <br />Discharge Pipe <br />Wherever possible maintain a grass cover over top of <br />trench and allow snow to remain in place. When snow <br />cover is light, place 6 marsh hay layer on ground above <br />pipe. <br />