The permittee shall pump, bail or otherwise remove any water which accumulates in trenches. Water shall not be permitted in trenches at any time during construction nor until backfilling over the top of pipe has been completed. The ground water level in trenches shall not be permitted to rise above an elevation of six inches (6") below the pipe. The permittee shall perform all work necessary to keep the trenches clear of water while the foundation and the masonry are being constructed or the pipe laid. (1959 Code § 4-7-10)