schedule. Generally, you can make changes to the schedule within 45 days of crew arrival on the job. Good supevisors ensure equipment, material, tools, and other facilities are on the job when needed. Missing items require an extra trip back to camp; this affects both production and crew morale.

PLANNING, ESTIMATING, AND SIZING PLUMBING SYSTEMS

You will provide input on the planning, estimating, and sizing of plumbing systems. This input may concern installation techniques, types of material required, quantity and size of piping or fittings, and so forth. This section provides information you must consider for planning and estimating a plumbing project. The National Standard Plumbing Code, military specifications, and job specifications provide more concise information.

SANITARY SYSTEMS

Various types of pipe and fittings are used for sanitary waste and drainage. However, the location of the installation determines the type of material you must use. Threaded pipe that is underground requires coal tar protection. Install underground sanitary waste and drainage lines in a separate trench from the water-service line. The underground water service and the building drain or sewer should not be less than 6 feet apart horizontally and placed on undisturbed or compacted earth. When separate systems of sanitary drainage and storm building drains are placed in one trench, they should be placed side- by-side. A building sewer or building drain installed in fill dirt or unstable ground should be made of cast-iron soil pipe, except that nonmetallic drains may be used when laid on an approved continuous supporting system. Table 7-1 depicts code requirements for pipe usage.

Table 7-1. - Sanitary Waste and Drain Piping