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Ctransitory eye irritation at concentrations above 200 ppm. Ethyl benzene �i is not considered carcinogenic. The mean odor, threshold is 2 ppm, which gives it excellent warning properties.; Ethyl benzene's ionization potential is 8.76 eV. X leve (o- , m-, p-isomers) PEL/TLV — 100 ppm, EL — 200 ppm (30 min/8' hrs) , C — 300 ppm Xylene is an eye, nose and throat irritant at concentrations nearing 200 rppm. At higher concentrations, itis a central nervous system depressant, with symptoms including nausea, fatigue, land headaches. Liquid xylene acts on the skin as an irritant and can 'causedermatitis. Exposure to vapor can cause eye irritation. Xylene its not considered carcinogenic. C Xylene's mean odor threshold is 1m which gives it pp g excellent warning j properties. The ionization potential for the Xylene isomers are 8.56, 8.56, and 8.44 eV, respectively. The following potential exposures may exist at the site: o Skin contact with contaminated materials ' (soil, water) ; L` o Inhalation of or vapors particulates'; and P o Ingestion of contaminated materials,, especially if poor personal hygiene is practiced. i Yg Skin contact with potentially contaminated,�soil --or water will be minimized by the use of personal protective clothing (as described in Section 7.0) . i rrInhalation of vapors or particulates during drillingactivities or during soil t� or water sampling will be minimized by air monitoring and the use of engineering controls and respiratory protection if action levels (see 6.1) are exceeded. Ingestion of contaminated materials will be minimized' by the use of appropriate personal hygiene procedures during decontamination (i.e. , thoroughly washing face and hands with soap and water after leaving the work area and prior to eating or drinking) . 5.3 NOISE HAZARDS The primary noise hazard at this site is' from the drilling equipment. rPrevious surveys indicate that such equipment may produce continuous and impact CHEVMERC.H50 13 l