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JG <br /> November 1990 -C1- H88168D <br /> I <br /> I <br /> APPENDIX C <br /> ENVIRONMENTAL MONITORING, SAMPLING, AND ANALYTICAL PROTOCOLS <br /> i <br /> SUBSURFACE EXPLORATION <br /> lExploration for this assessment consisted of drilling four vertical, <br /> hollow stem flight auger drill holes at the locations shown on Figure 2. The <br /> I I drill holes were drilled to depths ranging from 30 to 90 feet bgs. One of the <br /> four drill holes was completed as a ground water monitoring well. <br /> Logs of the monitoring well and drill holes are presented in Appendix <br /> A and; give descriptions of the earth materials encountered, show the depth and <br /> elevation of soil samples obtained, and indicate field monitoring performed. A <br /> ' f Legend to Logs is presented as Plate A-2 in Appendix A. Although transitions may <br /> �j be gradual, the stratification lines shown on the logs represent the approximate <br /> boundaries between soil types. The locations of the borings were determined by <br /> measurement from known landmarks. Elevations of the drill holes were approximat- <br /> ed by interpolation between map contours as was the top of casing of the <br /> monitoring well. The location and elevation of the drill holes should be <br /> considered accurate only to the degree implied by the method used. <br /> All drill bits and auger stems were steam cleaned prior to the <br /> drilling of each drill hole to prevent cross-contamination. Each boring was <br /> II logged by an SGD staff geologist, and the drill cuttings were monitored with a <br /> PID (TIP-1 manufactured by Photovac International, Inc. ) . The TIP-1 is equipped <br /> with a 10.6-electron volt (eV) ultraviolet lamp and an internal pump to draw the <br /> sample with a flow rate of 275 milliliter per minute (ml/min) (see soil sampling <br /> protocols below) . The PID is calibrated with calibration gas provided by <br /> Alphagaz at a concentration of 50 ppm. <br /> C <br />