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Kennedwjenks Consultants <br />clear the tracks as quickly as possible, and not carry any equipment or perform any function <br />which may delay the safe clearing of the tracks. <br />Work zones, including designation of an Exclusion Zone, a Contamination Reduction Zone, and <br />a Support Zone, will be established for any field activity that requires Level C protection or <br />greater. Work zones will be clearly marked in the field. Work zones may vary depending on the <br />proposed field activity and will be established in the activity-specific health and safety addenda. <br />7.3 Monitoring <br />7.3.1 Hazardous Substances <br />While not anticipated at the Mormon Yard site, as appropriate, field personnel will perform air <br />monitoring at least twice daily with a direct reading organic vapor analyzer (photoionization <br />detector [PO]) in the breathing zone at each work location. All readings shall be recorded in <br />field logs. All direct reading instruments shall be calibrated according to the manufacturer's <br />specifications. The following action levels will be used. <br />If PID readings for a particular work area consistently exceed 5 parts per million (ppm) <br />above background, then sampling will cease and personnel will withdraw from the work <br />area. <br />If concentrations persist above 5 ppm, then Level C protection will be required if work is <br />to continue. <br />If PID readings exceed 10 ppm in the breathing zone while workers are in Level C <br />protection, then work will cease, and the source of the emission will be determined and <br />eliminated before work continues. <br />7.3.2 Explosive Limits <br />If conditions encountered during drilling or sampling suggest potentially explosive conditions <br />may exist, the SSO will direct explosimeter monitoring be conducted. The following <br />explosimeter monitoring action levels will be used: <br />If gas or vapor concentration is less than 10 percent of its LEL, continue investigation. <br />If concentrations are between 10 and 25 percent of its LEL, continuously monitor site <br />and continue investigation with extreme caution. <br />If concentrations are greater than 25 percent of LEL, withdraw from area immediately. <br />7.3.3 Oxygen Content <br />If site activities involve confined space entry, oxygen concentrations within the space will be <br />measured with an oxygen concentration meter. The following oxygen monitoring action levels <br />will be used. <br />BNSF Mormon Yard - Soil Sampling <br />Site-Specific Health and Safety Plan <br />Mormon Yard, Stockton, California <br />© 2016 Kennedy/Jenks Consultants <br /> Page 17 <br />hsfocadlprojectslis-proj1201311365020.01_bnsf stockton work planI2016 hrsc work planlappendiceslappendixb_hasp12016_hasp_2015content_final.docx