A minimum excavation area of (A),6 ft or 2m x (B),10 ft or 3.05 m is required to accomplish the cleaning and lining work. The depth (C),of the access pit should extend a minimum of 1.5 ft ,or 0.45 m below the bottom of the exposed host pipe. Note, the host pipe used for tool entry should extend a minimum of 15 inches into the pit area after cutting. Each work area should have approximately four inches of #57 stone aggregate installed for drainage, a well/drainage basin should be located in the lowest point of the work area. The outflow should be large enough to allow a 2-4 inch suction line connection for dewatering.