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KEI GROUND WATER LEVEL MEASUREMENT <br /> AND SAMPLE COLLECTION QA PLAN <br /> Death to Water Level_Measurement <br /> Monitoring well reference elevations are measured to the center of <br /> the protective Christy box lid. When the lid is removed and depth <br /> to water measurements are desired, a rigid instrument, such as a <br /> ruler, is placed across the top of the now open Christy box. Depth <br /> to water is measured using an electric water level indicator and <br /> referenced to the middle and bottom edge of the rigid instrument <br /> spanning the top of the Christy box. Alternatively, a steel or <br /> aluminum yardstick covered with water finding paste is attached to <br /> a steel tape and lowered until part of the yardstick encounters the <br /> water layer. The measured length of the steel tape is added to the <br /> unaffected length of the yardstick as measured from the top of the <br /> yardstick to the point where the discoloration of the water f ending <br /> paste begins. Depth to water level measurements are made to the <br /> nearest 0 . 01 feet. <br /> Water levels are measured prior to development, purging or <br /> sampling. <br /> Free Product Thickness Measurement <br /> Free product measurements are made to the same reference point as <br /> described above for water level measurements. Free product <br /> thickness measurements are accomplished in one of several ways. <br /> Depth measurement to the top of the free product layer may be <br /> performed using an electric petroleum hydrocarbon indicator. <br /> Alternatively, a steel or aluminum yardstick covered with product <br /> finding paste is attached to a steel tape and lowered until part of <br /> the yardstick encounters the free product layer. The measured <br /> length of the steel tape is added to the unaffected length of the <br /> yardstick as measured from the top of the yardstick to the point <br /> where discoloration of the product finding paste begins. <br /> The total product thickness is determined by finding the difference <br /> between the measured depth to product and the measured depth to <br /> water. <br /> In most instances, it is possible to place both water finding paste <br /> and product finding paste on the yardstick and directly measure the <br /> thickness of the discolored product finding paste from the <br /> yardstick. Depth to free product or free product thickness <br /> measurements are made to the nearest 0. 01 feet. <br />