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c . The perimeter of the absorption bed may require a 2'' width redwood board retaining wall the height of the bed to maintain soil stability . 8 . 9 . 4 . Variation in design and sizing of a mound system must be done by a registered engineer and approved by the Director of Environmental Health . 8 . 10 . SUMPS (GREATER THAN EIGHT ( 8 ) FEET IN DEPTH) 1 . SuTflps are to be dug no deeper than twenty-five ( 25) feet nor closer than ter► ( 10 ) feet above the water table . - 2 . Sumps installed at depth four ( 4) feet to twenty-five ( 25) feet shall ,each a permeable soil strata . 9 . VAULTED PRIVIES 9 . 1 . General - A vaulted privy is a temporary means of disposal . For other than temporary use , it will be permitted only in those areas where a subsurface disposal system is not practicable . 9 . 2 . Location shall be such that, it, cannot discharge , flow , seep or drain into any ground water or water intended for human or animal consumption . The following are minimum distances ' 9 . 2 . 1 . From any well 100 feet 9 . 2 . 2 . From ,any dwelling 50 feet 9 . 2 . 3 . From any property line 10 .feet. 9 . 2 . 4 . From water table 5 feet. 9 . 3 . Construction . 9 , 3 1 . The pit shall be constructed of concrete and be water tight and not less than three ( 3) feet long and thirty ( 30 ) inches wide and shall be at least five (5) feet. deep. For each additional seat , the length shall be increased by two (2) , feet . 9 . 3 2 . The building shall be of tight construction to exclude insects and rodents . The riser shall be of matched tongue and groove lumber or concrete and molded seats shall be provided with tight - covers . The door shall be self-closing . The base shall be banked with earth and the vent pipe shall extend from the vault to one ( 1 ) foot above the roof . The top shall be screened with sixteen ( 18) mesh screen . 9 . 4 .D. A Sanitation Permit is required prior to construct loll . 2(►