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contact are the most common routes of entry. Chemicals can be introduced into the body by ingestion when chemicals present on the hands are transferred to food or cigarettes. Based on historical soil and groundwater sampling,ammonia,lead, and nitrate are the constituents of concern that may be encountered at the site. Universal Chemical Safety Data Cards for the constituents of concern are located in Appendix H. The FSO will collect material safety data sheets MSDS for chemicals that are routinely used by ERM at the site as part of the project. The MSDS for these chemicals are located in the H&S cabinet in the field office trailer. 5.8 AMBIENT AIR MONITORING Ambient air monitoring should be conducted by the FSO when there is a question of employee exposure to hazardous concentrations of substances to ensure the proper selection of engineering controls,work practices, and PPE. Additional monitoring should be conducted under any of the following circumstances: • Work begins on a different portion of the site; • Change in job tasks; • Change in ambient levels of hazardous constituents as indicated by the sense of smell or changes in the physical appearance of the soil or groundwater; and • When new hazardous substances are encountered. The soil remediation work will involve activities (excavation, stockpiling, and loading) similar to other earthwork projects, except the soil will be impacted. Therefore, air monitoring procedures will be employed during this work to verify that work does not adversely affect the off-site public. Specifically, air monitoring will consist of measuring total suspended particulates (TSP) at the property boundaries using real-time DataRAM TSP monitors. Ambient air monitoring for dust will be conducted using the direct- reading,real-time instrument MIE PDR 1000 Personal DataRAM TSP Monitor. Not all work at the site will require ambient air monitoring for all contaminants. During the mobilization phase of a particular project task or activity, either the PM or FSO will determine what contaminants may be encountered in order to have the appropriate instrumentation on ERM 5-3 DEERE/129740-9/29/2011