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7" -�X 'T"JONME G ON -=7'77 7"M xZr&kJM=WW GEOPROBE OPERATION CATEGORY: GEO 4.12 March 1998 4. Planning the Geoprobe Survey In planning the Geoprobe survey, research should be conducted on local and regional geology and hydrogeologic conditions; historic records on the size of the site; past waste disposal practices; types of waste material disposed of at the site; and depth and orientation of waste material. Sites should be evaluated in terms of their hydrogeologic setting. This evaluation will indicate the effectiveness of the survey, given site conditions. 4.1 Researching the Site Prior to designing the field survey, the following information should be collected, if available, from reconnaissance surveys, interviews, and research reviews: • Information on the types and locations of materials that may be buried on site to determine where subsurface investigations should not be con- ducted with a Geoprobe, and to identify the type(s) of samples to be collected; • Information on the surface layout of the site being studied, including information on topography, site boundaries, and the locations of build- ings, rail lines, overhead and buried utility lines (e.g., electric lines, pipelines, etc.), scrap disposal areas, and other structures that may pre- vent the proper operation of the Geoprobe; and • Maps, drawings, and photographs of the area; historical aerial photo- graphs may indicate previous disposal areas and poor waste disposal practices, and can also provide a base map for plotting data. 4.2 Defining and Mapping the Survey Site I After obtaining background data, the proposed sampling locations should be laid out based on the locations of buried material. Safety and accessibility are other factors to consider when locating sampling locations. 5. Field Procedures 5.1 Overhead and Buried Utilities ,The use of a Geoprobe on a site or project near electrical power lines and other utilities requires that special precautions be taken by both the operator and the helper. Electricity can shock, bum, and cause death. By law, overhead and buried utilities must be located, noted, and 3