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i TABLE 1 <br /> FIIELD HEADSPACE MEASUREMENTS* <br /> ORGANIC VAPORS, PARTS PER MILLION (PPM) <br /> Sam le ldumhe <br /> Approximate <br /> Depth Organic Vapor Readings <br /> (oom} <br /> S-1 7 ------—� <br /> 308 - 700 <br /> ... <br /> S-2 8 : <br /> 200 - 700 <br /> S-3 <br /> 8.5 <br /> 200 - 900 <br /> S-4 <br /> 9 400 - 600 <br /> S-5 <br /> 10.5 <br /> 600 - 700 <br /> S-6 11 <br /> 550 - 600 <br /> S-7 12.5 <br /> 300 - 700 <br /> S-8 13 <br /> 400 - 600 <br /> S-4 <br /> 14 200 - 500 <br /> 5-10 15 <br /> 200 - 450 <br /> 17 <br /> 200 - 400 <br /> S-12 17,5 <br /> 300 - 600 <br /> S-13 18 <br /> _ 700 - 960 <br /> * Headspace measurements are commonly used as a screening tool to assist <br /> in determining the presenceof volatile organic compounds (VOCs) in soil <br /> and are considered qualitative. Quantitative analytical values may <br /> differ significantly from headspace measurements since headspace values <br /> are a measurement of vapors which can include water and not concentra- <br /> tions of VOCs in soil. <br /> 6 <br />