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c equipment,such as the danger of falling objects or moving machinery. Simple precautions will reduce or eliminate risks associated with operating such equipment. Qualified personnel only will have any contact with this equipment. All on-site personnel, including the drilling contractor and his employees, are required to wear hard hats and steel-toed shoes when in close proximity to drilling equipment. Latex gloves will be worn by persons collecting or handling samples to prevent exposure to contaminants. Gloves will be changed between samples, and used ones discarded, to avoid cross-contamination. Proper respiratory equipment will be wom if vapor contamination levels on site exceed action levels as determined using a PID. Action levels requiring respiratory apparatus will be 5 parts per million(ppm)in the breathing space. Furthermore,no on-site smoking,open flame,or sparks will be permitted in order to prevent accidental ignition. Risk Assessment Summary: Exposure to chemicals anticipated onsite may include very low concentrations, that are significantly below the toxicity limits specified below, of lead paint, paint thinner compounds, fuels, benzene, toluene, ethylbenzene and xylenes (BTEX). These chemicals represent a hazard because they are moderately to extremely toxic and most are highly flammable. Threshold Limit Values(TLV's), Short Term Exposure Limits(STELPs),and Toxicity levels (LD50, oral- rat),all in mg/kg(ppm),are listed below: Comoound TLV STEL Toxici Lead 50 50 5.0 ppm STLC/1,000 ppmTTLC Kerosene/Paint Thinner 250 N/A Diesel 250 N/A Gasoline 200 300 Benzene 10 25 4,894 Toluene 100 150 5,000 Ethylbenzene 100 50 3,500 Xylenes 100 200 4,300 Benzene is considered a cancer hazard. Personal Protective Equipment(PPE): PPE will be level D. All personnel onsite when in proximity of drilling and heavy equipment will wear hard hats and steel-toed shoes. Work Zones and Security Measures: Access to the work area on site will be restricted to authorized personnel. A set of cones, or placards, or wide yellow tape,surrounding the site work area will define the perimeter. The Project Manager will be responsible for site security. Decontamination Measures: Avoidance of contamination whenever possible is the best method for protection. Common sense dictates that on-site personnel avoid sitting, leaning, or placing equipment on possibly contaminated soil. All personnel will be advised to wash their hands, neck, and face with soap and water before taking a break or leaving the site. Respirators will be washed with soap and water following each day's use, if needed. Drilling and sampling equipment used will be decontaminated by steam-cleaning,if needed;(needed for well installation only; not needed for well destruction). Sampling equipment will be decontaminated before each sample is taken and drilling equipment will be decontaminated before each boring is commenced; needed for well installation only; not needed for well destruction.