ARCHIVED REPORTS_XR0012626 - Laserfiche WebLink

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i tea I , w, B• Prevention of Dust Migration j As migration of dust containing petroleum hydrocarbon residues is a potential exposure pathway to the public, the following precautions are to be taken: o The entire excavation and operations area will be wetted down prior to each excavation day. o Sprinkling of the excavation will continue as required w, during soil handling operations. o All dust will be completely removed from excavation equipment and trucks prior to them leaving site by ! brushing all loose soil and dust from all machine surfaces and tires. o Transport trucks will be eq ipped with dust tarps to .. contain all soils as well as bed liners which are to be provided by the hauler. C. Air Emission Monitoring tai Monitoring of the ambient air for petroleum hydrocarbon ,., compounds will be required to assess the concentration of airborne emissions in the excavation area and to document average concentrations at the perimeter of the work zone. During earth moving operations, an HNu instrument will be utilized generally downwind of the immediate area of the excavation operations to monitor instantaneous hydrocarbon emissions. The purpose of the HNu monitoring will be to F + evaluate the adequacy of the Level B protection specified for the excavation personnel and to assess the source concentration of emissions generated by the excavation work. D. Calculations of Air Emissions Appendix A contains the "pounds per day" emissions calcula- tions for the BTX&E components. These calculations were prepared utilizing broad assumptions and can be considered to represent the worst case scenario. In any case, the .. calculated pounds per day value for the BTX&E compounds are shown below: o Minimum excavation extent - 350 cuyds - Total BTX&E ! � emissions - 165.54 lbs/day for 3 days. hi o Maximum excavation extent - 3500 cuyds - Total BTX&E emissions -- 298.05 lbs/day for 8 days. ice•✓ 13 - F s