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U-Haul Facility Number 7_OF � rzl-+oA— , California HEALTH AND SAFETY FLAN Page 8 4.3 HANDLING OF CONTAMINATED SOIL • The excavation shall be conducted in 50 foot by 50 foot or smaller sections to minimize exposure of soil potentially contaminated with VOC's. • During excavation, monitoring shall be conducted to measure VOC's at a distance of no more than 3 inches above the freshly dug soil by using an organic vapor analyzer (OVA). This measurement shall be made for every load of soil and shall be taken no longer than three minutes after each load of soil is excavated. • The OVA shall be calibrated using hexane at a range of 0 ppmv by volume to 50 ppmv. The OVA shall be calibrated at least once at the beginning of each working day following the procedures specified by the manufacturer. OVA monitoring and calibrations will be documented. • VOC contaminated soil is a soil which registers at County identified levels or 50 ppmv or more when measured with an OVA at a distance of no more than three inches above excavated and exposed soils. • If the OVA measurement is between 50 ppmv and 1000 ppmv or the County identified level: • The working area shall be immediately sprayed with water, or covered with clean soil or treated with a district approved suppressant and • Each VOC-contaminated load of soil shall be sprayed with water or treated with a district approved vapor suppressant and be stockpiled separately. • If the OVA measurement equals or is greater than 1000 ppmv or the County identified level, the working area shall be sprayed with water or district approved vapor suppressant or covered with at least 4 inches of clean soil and • All VOC-contaminated soil shall be stockpiled separately from the non-VOC-contaminated soil and covered or sprayed with water or with a VOC suppressant. • At the end of each workday, all stockpiles shall be covered with 2 layers of overlapped, continuous, heavy plastic sheeting and secured to withstand high winds.