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The vault shall be sized to accommodate a sump pit with a sump pump in addition to all the items of equipment listed above, with adequate working clearance around all equipment. The vault shall have a minimum depth of four feet. Pipe flanges shall be installed with sufficient clearances from walls and floors so that bolts can be inserted from either side of the flange and there is adequate space for tools (a minimum of nine inches). Adequate supports for pipes, valves, etc., shall be provided. (Design Guideline DG-08 § 6.2, dated August 2006)