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For frostproofing 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. ?olystyrene should be at least two feet wide. <br />Backf i I I <br />Expanded Polystyrene <br />Tamped Backfil I <br />Fi I I <br />Space <br />With Foam <br />Insulation -/ L Pump <br />for <br />Added <br />Protection <br />Discharge <br />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 />b <br />r <br />V <br />