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Clayton <br /> ENVIRONMENTAL <br /> CONSULT"TS <br /> The following presents the LEL for BTEX and formaldehyde suspected at the site: <br /> Table 4 <br /> Lower Explosive Limits (LEL) <br /> 7Benzene 1.3%P <br /> Toluene 1.2% <br /> Ethylbenzene 1.0% <br /> Xylenes 1.0% <br /> Formaldehyde 7.0% <br /> 10.0 NOISE HAZARD <br /> Drilling equipment used onsite may startle, annoy or distract workers and interfere <br /> with communication. According to the Occupational Safety and Health Standards, <br /> hearing protection shall be provided and worn when sound levels exceed 85 decibels <br /> (dBA) when measured on the A scale of a standard sound-level meter at slow <br /> response in accordance with ANSI SI.4. <br /> The SSO will determine if any employee's sound-level exposure has exceeded 85 dBA. <br /> The observations, or calculations which indicate that employee sound-level exposure <br /> may be above 85 dBA, including: <br /> • Any employee exposure measurements which may have been taken; <br /> • Any employee complaints which may be attributable to high sound levels; <br /> • Any difficulties in understanding normal conversation in the workplace when the <br /> speaker and the listener face each other at a distance of 2 feet. <br /> 11.0 EMERGENCY RESPONSE PLAN <br /> A plan specifying the emergency routes will be prepared before the start of site <br /> activities. These routes will be familiarized to all personnel who will be conducting <br /> field work. All work will be stopped during an emergency situation and all personnel <br /> evacuated from the danger area until the Project Manager judges it to be safe for <br /> work to resume. <br /> The SSO will familiarize the site personnel with the methods to communicate with the <br /> local fire department, police, paramedics, hospital facilities, and poison control centers. <br /> Local emergency service transportation will be provided to all personnel as needed. <br /> 8 <br /> HNG147952-04HSP <br />