The purpose of this Sampling Design Plan is to provide a plan for the field sampling and laboratory analysis to be performed in support of Remedial Investigation/Feasibility Studies (RI/PS) at Jefferson Proving Ground (JPG), Madison, Indiana. Included in this plan are activities designed to fulfill the requirements of a Screening Site Inspection (SSI). This plan is intended to be a guide that incorporates specific rationale and objectives for each sampling and analysis activity, sampling protocols and procedures, data and document management, and data interpretation and evaluation. Also included are logistics and schedule for the proposed RI field activities. The sections that follow describe in detail the field-investigation activities for sites identified at JPG that are known or suspected to have released hazardous contaminants to the environment and that may pose a threat to human health or the environment. As described in the Technical Plan (Volume I), several of the sites at JPG require additional information on the type(s) and extent of contaminants. This plan addresses the sampling design and procedures to be used to meet the objectives identified in the Technical Plan. Figures are included that show the proposed sampling locations, and corresponding tables are included to identify the sample number, type, and required analyses. Sections describing general equipment decontamination, sample handling, data and document management, logistics, and schedule follow the discussions of individual site field activities. Results of the field-investigation activities outlined in this document will be used in the evaluation of: the presence or absence and relative concentrations of reported or suspected contaminants at identified waste sites, the vertical and lateral extent of contamination, and the potential pathways for the migration of contaminants within the environment.