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36" MIN <br /> TYPICAL 3 2 <br /> Z <br /> g PEA GRAVE <br /> (OR APPRO\� <br /> 02 <br /> 03 <br /> ® 01 <br /> 02 <br /> - z <br /> 10" 10" 10-2 <br /> (4 PIPE)48"WIDE TRENCH <br /> (3 PIPE)36"WIDE TRENCH <br /> (2 PIPE)26"WIDE TRENCH <br /> 16"WIDE TRENCH <br /> (1 PIPE) <br /> PRODUCT / VENT PIPING <br /> PIP N G TRENCH SECTION <br />