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5.0 EXPOSURE MONITORING PLAN 5.1 AREA AND PERSONNEL MONITORING Air monitoring will be conducted to determine the presence of on-site hazardous conditions and will help determine the level of personal protection required for personnel. There may be two levels of air mon- itoring, if necessary. The monitoring will be conducted during activ- ities with the highest potential for exposure, i.e., drilling boreholes. Personnel monitoring will be performed under the direction of ERM- West's Certified Industrial Hygienist via National Institutes for Occu- pational Safety and Health (NIOSH) protocol. Environmental "direct-reading" monitoring will take place during all phases of the project. Environmental monitoring equipment will include a flame ionization detector (FID). A photoionization detector (PTD) is not suitable for this project since DBCP is not readily ionized by the PID. An FID will be required for all breathing zone monitoring. Characterization with this instrument will determine the relative con- centrations of total volatile hydrocarbons present and their concentra- tions in the workplace and will help assess worker safety. Air monitoring will be conducted during all active field work. The intent is to utilize generic field instruments and action levels to assess the continuous exposure to field personnel during the investigation and upgrade or downgrade personal protective equipment in response to the monitoring. The general monitoring shall consist of daily breathing zone monitoring every 30 minutes using the FID. Daily cali- bration and maintenance of the direct reading equipment will also be recorded and performed according to the manufacturer's recommenda- tions. All breathing zone readings will be recorded in the field log book or air monitoring form designed for that purpose. At the Lodi site, a stringer with fluorescent tape will be set up at the within easy visibility of the project boring location. This device will be monitored for shifts in wind direction every thirty (30) minutes, con- current with breathing zone monitoring. 5.2 ACTION LEVELS The health and safety officer will establish daily background total organic vapor (TOV) levels prior to initiating site activities. Under most circumstances, this level can be determined by taking multiple readings at representative locations along the perimeter of the site and averaging the results of sustained measurements. 5-1