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i . ENVIRONMENTAL MONITORING PLAN The potential hazards identified in the hazard analysis portion of this SSHP determined the need for initial and/or ongoing monitoring for assessment of exposure to the hazards as follows Monitoring for organic vapors and flammables will be accomplished using a TLV Sniffer portable gas detector and a combustible gas meter, respectively If concentrations of 10 ppm or greater above background are detected for total organic vapors. as measured in the working breathing zone, then halt-mask respirators will be worn If total organic vapors are consistently detected at greater than 50 ppm to 100 ppm then tull-tace respirators will be worn It concentrations exceed 100 ppm, then work activities will stop and the level of protective equipment will be reassessed It concentrations of 20 percent of the lower explosive limit are detected for combustible gases as measured at the borehole opening then the drill ng will be stopped and the levels allowed to dissipate. Measurements will be made at the borehole opening Instruments will be calibrated prior to use for each day's activities Heat stress (cold stress) will be monitored as described in the hazard analysis portion of this SSHP MEDICAL SURVEILLANCE REQUIREMENTS Medical surveillance is conducted as a routine program for BC field staff which meets the requirements of 29 CFR 1910120 (f) There will not be any special medical tests or examinations required for staff involved in this project. SITE CONTROL MEASURES Exclusion, decontamination, and support area(s) for the various field activities will be set up by the SSO Communication between field team members will consist of verbal communications. The nearest medical assistance is St. Joseph's Medical Center of Stockton, 1800 North California Street, Stockton, California. General information and emergency telephone number (209) 467-6400. In case of emergency, 911 can also be dialed Work Practices Safe work practices to be employed during the entire progress of field work are as follows I. Set up, assemble. and check out all equipment for integrity and proper tunction prior to starting work activities 76034tEPOR7SIKFNT-MLSFP