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C.1. AIR MONITORING(Direct-Reading Instruments) ® Applicable ❑ Not Applicable,Not Anticipated EXPLANATORY NOTES,CLARIFICATIONS: ® AIR-TESTING Z VOCs,GASES ❑Flammable gas(LEL) PARAMETERS Z PID, Lamp energy: 10.6 eV ❑Particulate(dust) ❑FID ®Calibration kit for each parameter ❑Carbon monoxide ❑Other: ❑Hydrogen sulfide ❑Oxygen(02) ACTION LEVELS FOR ❑Oxygen <19.5%-ventilate to raise 02 to acceptable levels,or use Level B. 02/LEL >23.0%-ventilate to lower 02 to acceptable levels,or use Level B and control fire hazards&ignition sources. ❑LEL Confirm at least 12%oxygen is present to ensure accuracy of LEL readings. At<10% LEL-Continue working,continue to monitor LEL levels At>10% LEL-Immediately withdraw from area. Resume work ONLY after LEL readings reduced to<10%. ® ACTION LEVELS FOR Parameters Level D,Modified D* Use levels C or B*,as indicated below,OR take action to reduce breathing TOXICSzone level to concentration acceptable for Level D*. _......... — - - - (sustained Z VOCs < 2 ppm _ ppm to _ ppm: Level C(air purifying respirator) breathing zone > _ ppm:Level B(air-supplied respirator) concentrations) ❑Carbon Monoxide <35 ppm >35 ppm- Level B (air-supplied respirator) ❑Hydrogen Sulfide <10 ppm >10 ppm-Level B (air-supplied respirator) ❑Total Dust < mg/m' >_ mg/m'-Level C (air-purifying respirator) ❑ *Levels of Protection: Level D(standard work clothes,basic personal protective wear,no chemical protective clothing,no respiratory protection) Modified Level D(chemical protective clothing in addition to standard work clothes,no respiratory protection) Level C(air purifying respirator or dust mask,in addition to chemical protective clothing) Level B or A(air supplied respirator,chemical protective suit;fully-encapsulating suit for Level A) Geosyntec Procedures: HS-111-Air Monitoring C.2. OTHER WORKER EXPOSURE MONITORING ❑Applicable ® Not Applicable,Not Anticipated ❑Air Sampling(sample collection,passive dosimeter) ❑Ionizing or Non-ionizing Radiation Testing ❑Heat Stress Testing ❑Wipe/Bulk Sampling(to evaluate worker exposure) ❑Noise Testing ❑Other EXPLANATORY NOTES,CLARIFICATIONS: Geosyntec Procedures: HS-109-Hearing Protection,HS-111-Air Monitoring,HS-124-Heat Stress Prevention,HS-126-Radiation Safety Program, HS-128-Ionizing and Non-ionizing Radiation, HS-601-Asbestos,HS-602-Lead Geosyntec THA(ver.2)-Task 3-Soil Vapor Probe Installation and Sampling October 22,2020 Lincoln Center-SAC1111 Page 11 Consultants