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TALE 1 <br /> FIELD HEADSPACE MEASUREMENTS* <br /> ORGANIC VAPORS, PARTS PER MILLION (PPM) <br /> Approximate Depth Organic Vapor Readings <br /> Sam le Number __ feet) _ m <br /> S-1 7 308 - 700 <br /> S-2 8 200 - 700 <br /> S-3 8 5 200 - 900 <br /> S-4 9 400 - 600 <br /> S-5 10 5 600 - 700 <br /> S-6 11 550 - 600 <br /> S-7 12 5 300 - 700 <br /> S-8 13 400 - 600 <br /> • 5-9 14 200 - 500 <br /> 5-10 15 200 - 450 <br /> 5-11 17 200 - 400 <br /> 5-12 17 5 300 - 600 <br /> 5-13 18 700 - 960 <br /> * Headspace measurements are commonly used as a screening tool to assist <br /> in determining the presence of 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 />