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P-902.3.1 In Separate Trench
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For house drains installed beyond the building wall in a trench separate from water
service or water distribution pipe, the drain pipe shall be of cast iron hard temper copper tube of a weight not less than type "L", vitrified clay pipe, concrete, or plastic. If the drain consists of plastic materials, the underground
water service or water distribution pipe and the house drain shall be not less than 10 feet apart horizontally and shall
be separated by undisturbed or compacted earth, or shall be in accordance with Section P-805 when approved by
the Department.
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