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GEOPROBE OPERATION CATEGORY: GEO 4.12 March 1998 Depending on the purpose of the investigation, the lead rod will be equipped to collect soil, groundwater, or soil gas samples. After the lead rod has been driven into the ground 2.5 feet, the helper attaches an additional 3-foot-long section of rod and the process is repeated until the desired depth has been reached. 3. Responsibilities 3.1 Operator The crew consists of an operator and a helper. The operator is responsible for the safe and efficient operation of the Geoprobe, and also performs the daily inspections and mainte- nance. In addition, the operator inventories the supplies and equipment daily and ensures that an adequate supply of expendable parts are on hand. The operator is responsible for completing the subsurface investigation in accordance with the site-specific work plan and in a safe manner consistent with the site health and safety plan. Routinely, the operator is also the field team leader and as such, is responsible for (1) the quality of the samples recovered from the Geoprobe; (2)compliance with the project's quality assurance/quality control requirements; and (3) completion of the site log. If the operator observes any unsafe or potentially dangerous situations, the operator will stop operations until the proper corrective actions have been taken. The operator has the authority to secure operations at any location if the operator concludes that the conditions are dangerous or could compromise the quality of the samples. 3.2 Helper The primary function of the helper is to assist the operator in conducting the subsurface investigation. The helper is responsible for assembling, securing, and disassembling the rods and other sampling tools used in the investigation. The helper is also responsible for ensuring that all of the equipment is properly decontaminated and that all tools are in proper working order. If the helper notices any unsafe or potentially dangerous situations, the helper will inform the operator immediately. The helper must be attentive to conditions around the Geoprobe because the operator will be concentrating on the operation of the unit. 3.3 Site Safety Coordinator The site safety coordinator(SSC) is responsible for ensuring that the subsurface investigation is completed as outlined in the site health and safety plan. The SSC will ensure that all overhead and buried utilities (e.g., electrical lines, telephone lines, natural gas lines) have been identified and located prior to commencing the subsurface investigation. The SSC will be familiar with the operations of the Geoprobe and the potential hazards posed by its operation. In many cases, the operator or helper also serves as the SSC. 2