Use observations in the field in conjunction with results of lab testing to develop a soil and bedrock profile for use in the reporting. Keep the number of strata to a minimum. Remember that every small variation in a soil—such as a change in clay from “slightly sandy” to “sandy” does not necessarily warrant a stratigraphy change. The logger must define strata that have significance to designers and contractors who will use the core log information. Capture the primary and secondary soil or rock constituent and whether ground water is present.