Review all existing data before determining new data requirements. Old bridge plans are the most common source of information. Old borings containing strength data are usually adequate for new construction. If old borings are used for design, show the old boring data on the plans, and note the date of the boring. Old TCP data may have an additional value listed: the weight of the drill stem when the test was performed. Disregard this number and do not show it if the old borings will be shown in the new plans.