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Chevron U.".h• Inc. <br /> Site Safety Ilan <br /> June 19, 1991 <br /> 4.9.4 gi^.DFIiflg».ra51l.Laz:(-n1 <br /> SY.in and cyto contact with methanol, equiAlcopment. Thi:sox, or rhnznrdlcan <br /> aubatanceaa can occur while cleaning equipment. <br /> be reduced with the u.e of ttitrile� butyl rubbor or neoprene <br /> glovers and the use of :safety gog9le <br /> 4.3.5 �IL��A�-1 <br /> Manholes, subsurface vaults and sheds are nxasnpleu of confined <br /> spaces that may lack adequate vtilation.ressulti.ng inganic iacr<noLoaxygc» <br /> combustible vapors saay be trapped <br /> (anoxia) and/or overexposure to vapors. when site work takes <br /> plata in a confined :space the air nurt be monitored for (a) <br /> oxygen level, (b) flammable <br /> lammabl vapors, ads b) folilowed c vapors. The <br /> following air monitoring procedures <br /> entering a confined :pace. <br /> a. , „ v Monitor for t Oxygen with an 02/LELoxygen <br /> 1 v motor to <br /> ensure a mininun oxygen level of 19•r5iic]dlex nd bottom <br /> of <br /> monitoring will be done to the tnPr <br /> the enclosed space to determine if ther�ois a entryinirausa <br /> acceptable oxygen level of 19.51 IUpE <br /> If oxygen Is .less than 19.58, do not ontor the rspace. <br /> Lower Explosive Limit <br /> b. �ra92jVe: V11p9 ;: Monitor for % of <br /> (LEL) with a 02/GEL motor to determine whether vapor <br /> concentrations within the confined space aro within the <br /> flammable range. <br /> If LEL readings exceed 20%, Personnel MUST leave the sit* <br /> imsaodiateaiy, and contact the project saanager. <br /> C. Q c V mr : Monitor for toxic vapors with a PID and/or <br /> an FID (e.g. , 11t;U or OVA) to determine whether toxic <br /> vapors within the confined space exceed the action levels, <br /> dings exceed 50 <br /> facehr spiratorowitheOrganicFID avapor cartridges pMust ahalf <br /> be <br /> worn. <br /> if the PID and/or then PID readings exceed 100 PPM, a toil <br /> lace respirator with organic vapor cartridges Must b0 <br /> worn. <br /> All monitoring equipment must be calibrated and maintained <br /> 1{ UaisousedCth,a 10.2 <br /> etnoValarpeisJrequirednforiaccurate an <br /> readings. - - ----- — <br /> il <br />