SITE INFORMATION AND CORRESPONDENCE

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-2- On February 15 a PID (Photo-Ionizing Detector Model 580-A manufactured by Thermo Environmental , Inc. of Franklin , Massachussetts) was used to check air quality inside the pesticide storage building, around the recently installei monitoring wells adiacent to the locomotive maintenance pit in Building 816B and near the waste oil tank next to Building 815C. Readings inside the pesticide storage builling were consistently zero ppm. . At the monitoring wells , readings varied from zero ppm to over 300 pp,1 at the open well casing heads. Readings a few feet above the well heads were zero ppm. After an hour inside Building 8166 with the well heads uncovered, readings 4 to 6 feet above the floor were still zero ppm. On future visits to the work sites , ERA-West will use the PID to monitor air quality wherever any possibility of lowered air quality exists. Woenever PID readings in the worker' s head area exceed a one-time reading of 10 ppm or an average of 1 ppm during any 15 minute period, work will be halted until proper respiratory protective equipment can be donned (air quality ceilings based on NIOSH limits for benzene). 2. RESPIRATOR SELECTION PROGRAM/PERSONAL PROTECTIVE EQUIPMENT ERM-West chooses respiratory equipment according to the documented recommendatiorrs published in the NIOSH Guide to Chemical Hazards. These recommendations were followed in the development of their Health and Safety Plan. The decision to upgrade or downgrade the level of personal protective clothing is based on information in the Health and Safety Guidance Manual for Hazardous �daste Site Operations prepared by ER11-14est. Briefly, the manual contains the following guidelines for upgrading or downgrading the level of personal protective equipment in general : Reasons to upgrade: (1 ) Known or suspected presence of dermal hazards. (2) Occurrence or likely occurrence of gas or vapor emissions. (3) Change in work task that .gill increase contact or potential contact with hazardous materials. (4) Request of the individual performing the task. Reasons to Downgrade: (1 ) New information indicating that the situation is less hazardous than was originally thought. (2) Change in work task that will reduce contact with hazardous materials.