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L. %WO %%Md NATIONAL AD\'FRTISI\G COMPANY— ADDITIONAL SUBSURFACE INVESTIGATION' HEALTH AND SAFLTY PLAN V TABLE 7-2 MONITORING PROGRAM ACTION LEVELS 7.2 NOISE EXPOSURE Earth Tech has implemented a worker hearing conservation program to prevent occupational hearing loss. Data gathered in this effort indicates that workers may be exposed to hazardous levels of noise when �. operating within 25 feet of operating heavy equipment (drill rigs, earthworking equipment, etc.). While appropriate hearing protection requirements (see Section 6.2) are enforced in all work areas, the Earth Tech Health and Safety Department may conduct supplemental monitoring to verify the adequacy of this LM guidance for the unique conditions of this project. hslprojsuplcominachasp.doc 7-2 02/09/98 LN RESPONSE LEVEL La LOCATION AND INTERVAL (above background) RESPONSE Continue work in required < 5 units PPE and continue monitoring. Monitor for benzene. 5 — 15 units Continue work in required y (Sustained for more PPE unless benzene is present, than 5 minutes) and continue monitoring. VOCs Breathing Zone, every 15 minutes Monitor for benzene using (Total by PID) during intrusive activities 15 — 50 units Draeger tubes. Contact the SSO, implement mitigation (Sustained for more measures, and upgrade PPE to than 5 minutes) Level C (organic vapor cartridge) unless benzene is V present, and continue monitoring. > 50 units Cease work, exit, and contact (Sustained for more the SSO. x, than 5 minutes) < 10 units Continue work and continue VOCs. Edge of Exclusion Zones, every 15 monitoring. Lo (Total by PID) minutes during intrusive activities > 10 units Implement mitigation (Sustained for more measures and contact the SSO. ' than 5 minutes) Benzene Continue work activities in (By No color change required protective equipment. Colorimetric Breathing zone, every 10 minutes Cease work, exit the area, and where indicted by PID readings contact the SSO. Lo Any Any color change < 10% LEL Continue work activities. Explosivity During intrusive work, and upon Cease work, exit the area, and (by Multigas opening any well 10% LEL contact the SSO Meter) 7.1.3 Personal Sampling Measurement of employee exposure to chemical contaminants will be performed at the discretion of the ' Health and Safety Professional. Monitoring techniques will also be determined by the Health and Safety Professional, and will conform with applicable OSHA and NIOSH sampling methods. Samples will be collected by, or under the direction of, a member of the Earth Tech Health and Safety Department. Any ' analytical laboratory performing analysis of personal samples shall be accredited by the American Industrial Hygiene Association (AIHA) and be a participant in the AIHA Proficiency Analytical Testing (PAT) program. 7.2 NOISE EXPOSURE Earth Tech has implemented a worker hearing conservation program to prevent occupational hearing loss. Data gathered in this effort indicates that workers may be exposed to hazardous levels of noise when �. operating within 25 feet of operating heavy equipment (drill rigs, earthworking equipment, etc.). While appropriate hearing protection requirements (see Section 6.2) are enforced in all work areas, the Earth Tech Health and Safety Department may conduct supplemental monitoring to verify the adequacy of this LM guidance for the unique conditions of this project. hslprojsuplcominachasp.doc 7-2 02/09/98 LN