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OUTLINE FOR WORKPLAN <br /> 2. Introduction <br /> 1. 1 Site History, including appropriate diagrams and <br /> maps (may be repeated from site history <br /> descriptions from prior plans) . <br /> 1. 1. 1 Table of Site Chronology <br /> 1.2 Workplan Objectives (from present to end of <br /> clean-up project) . <br /> 1. 3 Approach/Methodology of the Investigation <br /> I2. Evaluation of Existing Data <br /> 2 . 1 Potential Contaminant Sources and Characteristics. <br /> Retort Pit, pond, surface runoff drain system, <br /> potential surface runoff off-site, and other <br /> potential sources of contamination (past and <br /> present) . <br /> 2 . 2 Migration Pathways. <br /> Soil, groundwater, surface water and air <br /> 2 . 3 Contaminant Receptors and Environmental Impacts. <br /> Nearby land use, nearby surface waters, data on <br /> sensitive environments. <br /> 2 . 4 General Response Actions (to date and potential <br /> future) . <br /> To date: line retort pit, pave site, drainage <br /> system, etc. <br /> Future: berm around paved area, treat <br /> groundwater, etc. <br /> III. Site Characterization <br /> 3 . 1 Field Investigation (on-site and off-site) . <br /> 3 . 1. 1 Soil Contamination Investigation. <br /> 3 . 1. 2 Groundwater Contamination Investigation <br /> 3 . 1. 3 Site Hydrogeologic Investigation (to the <br /> extent necessary to assess remedial <br /> measures) . <br /> Drill and log test holes, determine <br /> hydraulic gradients (vertical and <br /> horizontal) , perform permeability testing, <br /> test physical properties of soils, <br /> calculate rate and direction of groundwater <br /> flow. <br /> 3 . 1. 4 Surface Water Contamination Investigation. <br /> 3 . 1.5 Air Contamination Investigation. <br />