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.................... . Jo Ann Knight May 25, 2001 Page 2 of 4 INSTRUMENTS • Ludlum-19, radiation detector, serial number 167798, calibrated in March 2001. This instrument detects gamma and x-ray radiation dose rates from 0 - 5000 micro- RAD per hour. • RAE Systems model PGM-7600, photoionization detector (PID), serial number 110- 003603, equipped with a 10.6eV lamp, and calibrated on May 15, 2001. This instrument detects predominantly volatile organic compounds with ionization potentials below the lamp voltage. SITE VISIT The team arrived at the facility at 0830 on May 16, 2001. The purpose of the visit was to monitor compliance with regulations governing generation, storage, and shipment of hazardous wastes. Industrial hygiene monitoring support was requested due to potential exposures to radioactive waste. Industrial hygiene monitoring for VOC exposure was also conducted due to the presence of waste solvents. DTSC personnel were escorted around the site by Stan Terusaki (Environmental Analyst) and Sav Mancierl (Environmental Analyst). After the in-briefing, the group proceeded to building 883 which is a permitted storage facility and a 90-day storage area for wastes. The 90-day section contained mainly radioactive wastes from explosive testing areas,solvents and oils from manufacturing operations, and asbestos from abatement activities. Radiation levels from 50-500 micro-RAD per hour were detected in this area. No VOCs were detected. DTSC personal protective ensemble included steel toe boots with street clothes. 1 Monitoring Results - 90 Day Stora ga Area Time Instrument Serial Nr. Reading Comments 1030-1100 Ludlum-19 167798 13-15 D/Hr Background 1030-1100 Ludlum-19 167798 50-500µRAD/Hr Highest within 1-foot of radioactive waste drums 1030-1100 PGM-7600 110-003603 0.0 RRU Background 1030-1100 1 PGM-7600 110-003603 0.0 RRU Inside area RRU = Relative Response Units The permitted storage area contained mainly waste Safety Kleen solvents, photograph processing chemicals, oils, and asbestos. Personal protective equipment (PPE) for DTSC personnel consisted of boots for this area. Radiation in this area generally matched background of 7-15 micro-RAD per hour. However, three unusual spikes of at least 250 micro-RAD per hour were noted while in the area. For comparison, a Site 300 employee was called to the location with a gamma detector that measured in the same units as the Ludlum-19. The LLNL instrument readings were identical to the