This document provides guidance on soil and water sampling. It outlines factors to consider when sampling, such as sampling procedure, sample size, and participation rates. It discusses the importance of representative, appropriately sized, unbiased, and random samples. Types of sampling techniques include probability and non-probability. Sources of error in sampling include sampling error, coverage error, and non-response. The document also provides details on tools and methods for collecting soil and water samples, including information to record about the sampling location and handling procedures to avoid contaminating water samples.