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DRILLING AND WLING • <br /> For all drilling and sampling activities, the following standard <br /> safety procedures shall be employed: <br /> 1. All drilling and sampling equipment should be cleaned before <br /> proceeding to the drill site. <br /> 2. At the drill or sampling site, sampling equipment should be <br /> cleaned after each use. <br /> 3. Work in 'cleaner" areas should be conducted first where <br /> practical. <br /> 4. The minimum number of personnel necessary to achieve the objec- <br /> tives shall be within 25 feet of the drilling or sampling <br /> activity. <br /> l <br /> 5. If emergency and backup subcontracted personnel are at the <br /> site, they should remain 25 feet from the drilling or sampling <br /> activity, where practical. <br /> 6. Exclusion sones will be established within designated hot <br /> lines. Delineation of a hot line will reflect the interface <br /> between areas at and below a predetermined threshold con- <br /> taminant concentration, based on available data including the <br /> results of monitoring and chemical analyses, information from <br /> site personnel regarding historical site activities, and <br /> general observations. This determination will be made by the <br /> PM in conjunction with the S50 and site personnel. <br /> 7. All unauthorized personnel will remain outside exclusive zones <br /> at all times. <br />