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P-1103.1 Main trap. Leaders and storm drains connected to a combined sewer shall be trapped. Individual storm water traps shall be installed on the storm water drain branch serving each conductor, or a single trap shall be installed in the main storm drain just before its connection with the combined building sewer or the public sewer. A single hooded catch basin located within the property line shall be the equivalent of a building (house) trap for the connection to a street combined sewer. Leaders and storm drains connected to a building storm sewer shall not be required to be trapped.
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