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/V ITTELHAUSER <br /> corporation <br /> MITTELHAUSER CORPORATION <br /> GROUNDWATER MONITORING AND SAMPLE COLLECTION I <br /> FIELD PROTOCOL E <br /> I <br /> WATER LEVEL MEASUREMENT <br /> M Monitoring well reference elevations are measured to a marked or <br /> notched location at the top of the well pipe which has been surveyed by a licensed <br /> surveyor. Depth to water is measured using an electric water level indicator and <br /> referenced to the surveyed mark at the top of the well pipe. Alternatively; a steel or <br /> aluminum yardstick covered with water-finding paste is attached to a steel tape and <br /> lowered until part of the yardstick encounters the water in the well. The measured <br /> length of the steel tape is added to the unaffected length of the yardstick as measured <br /> ` from the top of the yardstick to a point where the discoloration of the water-finding <br /> paste begins. Depth to water-level measurements are made to the nearest 0.01 foot. <br /> Water levels are measured prior to well development and well purging for <br /> the purpose of sampling. <br /> FREE PRODUCT LAYER THICKNESS MEASUREMENT <br /> f Free product measurements are made to the same reference point as <br /> described above for water-level measurements. Free-product layer thickness <br /> measurements are performed in one of several ways. <br /> Measurement to the top of the free-product layer maybe performed using <br /> an electric petroleum hydrocarbon indicator. An electric water-level indicator is <br /> covered with product-finding paste and is lowered into the well until the water-level <br /> sensor indicates that water has been encountered. The probe is then withdrawn from <br /> the well and the affected length of the product-finding paste is .measured. <br /> Alternatively, a steel or aluminum yardstick covered with product-finding paste is <br /> attached to a steel tape and lowered until part of the yardstick encounters the free- <br /> product layer. The measured length of the steel tape is added to the unaffected <br /> length of the yardstick as measured from the top of the yardstick to the point where <br /> discoloration of the product-finding paste begins. . <br /> The total product layer thickness is determined by finding the difference <br /> between the measured depth to product and the measured depth to water. <br /> In most instances it is possible to place both water-finding paste and <br />` product-finding paste side by side on the same yardstick and directly measure the <br />` thickness of the discolored product-finding paste from the yardstick. Depth to free <br /> product or free-product thickness measurements are made to the nearest 0.01 foot. <br /> I <br />