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' September 2007 • pMadre ' Project No. 0701-2621 ® ENVIRONMENTAL SCIENTISTS Overhead and Underground Utilities. Typical site activities such as movement of ' equipment or intrusive activities such as subsurface drilling can present the risk of contact with overhead or underground utilities. A safe distance (10 to 15 feet) will maintained between the drilling rig and any identified overhead utilities. Additionally, Underground Service Alert will be ' contacted to mark all underground facilities in the vicinity of intrusive activities. The potential for employee exposure to utility hazards is low during field activities. Heat Stress. High temperatures, direct sun, use of PPE, and labor-intensive activities may contribute to heat stress. Heat stress can involve a high risk of illness of death. Exposure to heat stress at this site is considered low, because field work will be performed in the fall ' months. Fire and Explosion. Gas or sewer lines can contain hazardous levels of explosive or toxic gases, which may pose a fire risk. The risk of fire on site may also stem from the presence of vegetation, heat and fuel sources from construction equipment and site vehicles, or ' from the presence of combustible gases or vapors in contaminated soil and/or wells. The potential exposure to fire and explosion hazards is considered low. Traffic Hazards. Work activities along roadways, parking areas, and entrance and exit ' areas create exposure to traffic hazards. Field activities will occur in a railroad ROW near the Cardinal Avenue crossing; however, no drill holes will be advanced in the roadway. The ' potential exposure to traffic hazards is considered moderate. Therefore, appropriate measures, ie cones, barricades, will be employed to protect workers from traffic on Cardinal Avenue. ' GENERAL SAFETY RULES 1. There will be no eating, drinking, or smoking within the safe perimeter set up. 2. Fire extinguishers will be onsite on or near Padre Associates, Inc.'s vehicle. ' 3. A first aid kit is located at the onsite command post. EQUIPMENT ' Personal Protective Equipment. On the basis of the evaluation of potential hazards, the level of protection deemed appropriate for this site is Level D. If organic vapor concentrations in the breathing zone exceed 40 parts per million by volume (ppmv), EPA Level C personal protective equipment will be used. These concentrations are based on personnel ' exposure limits (PELs) and threshold limit values (TLVs) of the various contaminants anticipated, with some consideration given to possible contaminants encountered in combination. ' Level D equipment includes: hard hat steel toe and shank boots ' safety glasses or goggles ozzszi.Twvnoc -A5 -