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explosive limits are 1 .4% (14, 000 ppm) , 0. 9%, and 0. 6 to 1.3%, <br /> respectively. <br /> Underground Utilities <br /> Contact with buried utilities during SVCA surveys presents <br /> potential acute hazards to site personnel. At a site, buried <br /> lines may include: <br /> - electrical lines <br /> - natural gas/petroleum lines <br /> - product and vapor recovery lines <br /> - communication cables <br /> - sewer, water, and irrigation lines <br /> The hazards of contacting each type. of line varies, but the most <br /> serious are the electrical lines (which can result in <br /> electrocution) , fuel and gas lines (which could result releases of <br /> flammable chemicals) , and water lines (which could be under <br /> pressure) . <br /> Traffic Hazards <br /> Traffic at gas stations, and to a lesser degree other sites, <br /> presents a hazard to personnel involved in conducting the survey. <br /> Both injury and equipment destruction can be caused by a traffic <br /> accident . <br /> Noise Hazards <br /> An electric drill can create high levels of noise. The results <br /> of exposure to these levels vary from discomfort to hearing loss <br /> and a permanent ringing in the ears. <br /> Weather Hazards <br /> SVCAs may have to be conducted under adverse weather conditions, <br /> 5 <br />