New Construction - Geological, topographic, climatic, and seismic information from published sources is
useful in planning exploration work and interpreting site observations. See Table 1-1-1.
b. Maintenance - Review the information for new construction as noted in Table 1-1-1, supplemented by a
performance history of the problem area. Include a review of the slow order history, surfacing operations,
track geometry history, traffic density history, drainage conditions, apparent failure mechanisms, frequency
of failure, and apparent correlation with weather. Some problem maintenance areas will become readily
apparent when the above information is graphed with respect to time.