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ARCADIS SOP: Soil Drilling and Sample Collection 4 <br /> Rev.#: 2 1 Rev Date: March 8, 2011 <br /> • Ground Penetrating Radar(GPR) <br /> • Any other method that may give ample evidence of the presence or location of <br /> subgrade utilities. <br /> Overhead power lines also present risks and the following safe clearance must be <br /> maintained from them. <br /> Power Line Voltage Minimum Safe Clearance <br /> Phase to Phase(kV) (feet) <br /> 50 or below 10 <br /> Above 50 to 200 15 <br /> Above 200 to 350 20 <br /> Above 350 to 500 25 <br /> Above 500 to 750 35 <br /> Above 750 to 1,000 35 <br /> ANSI Standard 830.5-1994, 51-3.4.5 <br /> Avoid using drilling fluids or materials that could impact groundwater or soil quality, or <br /> could be incompatible with the subsurface conditions. <br /> Water used for drilling and sampling of soil or bedrock, decontamination of <br /> drilling/sampling equipment, or grouting boreholes upon completion will be of a quality <br /> acceptable for project objectives. Testing of water supply should be considered. <br /> Specifications of materials used for backfilling borehole will be obtained, reviewed and <br /> approved to meet project quality objectives. <br /> V. Health and Safety Considerations <br /> Field activities associated with overburden drilling and soil sampling will be performed <br /> in accordance with a site-specific HASP, a copy of which will be present on site during <br /> such activities. <br /> VI. Procedure <br /> Drilling Procedures <br /> The drilling contractor will be responsible for obtaining accurate and representative <br /> samples; informing the supervising geologist of changes in drilling pressure; and <br />