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t ► <br /> Site Safety Plan: Subsurface Investigation and Safety Plan Page 3 <br /> Remedial Excavation of Hydrocarbon-affected Soil <br /> Proposed Cintra Park Phase II Development, Tract 2705, Tracy, California <br /> 3.2 Air Monitoring <br /> The fire, explosive, and toxic inhalation hazards previo sly mentioned will be evaluated through an <br /> air monitoring program consisting of the following ele ents: <br /> 3.2.1 Combustible Gas Monitoring. A direct- cading combustible gas/oxygen meter will <br /> be used to evaluate the possible forma ion of flammable atmospheres around the <br /> work area. Continuous flammability measurements will be taken at the top of the <br /> boring near the work crew throughout the well installation operations. Periodic <br /> measurements will be taken at the soil piles, within the excavations, and in all <br /> confined areas that may contain and ac emulate combustible vapors. Combustible <br /> readings above 10%of the lower explo ive limit (LEL) will require the suspension <br /> of all work activities until flammable levels have been reduced. <br /> 3.2.2 Organic VUor-Monitoring.. Potentiall toxic airborne concentrations of methane, <br /> benzene,toluene, xylenes, and ethylben ene will be measured periodically near the <br /> breathing zone of the work crews with a colormetric indicator tube sampler. If vapor <br /> readings for any of the listed organic con aminants exceed their threshold limit value- <br /> time weighted average (TLV-TWA) oncentrations, appropriate vapor control <br /> strategies will be applied as discussed in Sections 4.0 and 5.0 of this plan(Environ- <br /> mental Controls and Personal Protective Equipment). The TLV-TWA concentration <br /> for each volatile organic compound (V C) is listed in Table 1 below: <br /> .z ?7 ,[�'"g" ° ..,n..ea¢ ' �[T i°pgFk�yaa, ¢i°€ s d�F (�¢r eng€�» i°€ °� s 1 �,t, { <br /> . ��� •yg.d3a•��3 3d� ?33a x33 ssH' <br /> Volatile Organic Compound TLV-TWA m <br /> Benzene 1 ppm <br /> Toluene 100 ppm <br /> Xylenes 100 ppm <br /> Eth lbenzene 100 m <br /> 3.3 Noise. Heat. and Work Condition Evaluations <br /> 3.3.1 Noise Exposures. All workers entering high noise areas will wear hearing protection <br /> (ear plugs or muffs). <br /> W TRDIECT5\102305%NKPO1.WPD <br />