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r� I : D November 1990 -C1- M88168D k i APPENDIX C ENVIRONMENTAL MONITORING, SAMPLING, AND ANALYTICAL PROTOCOLS i i SUBSURFACE LXPLORATION r i Exploration for this assessment consisted of drilling four vertical, , ai hollow stem flight auger drill holes at the locations shown on Figure 2. The drill holes were drilled to depths ranging from 30 to 90 feet bgs. One of the four drill holes was completed as a ground water monitoring well. .1 Logs of the monitoring well and drill holes are presented in Appendix "rte A and; give descriptions of the earth materials encountered, show the depth and j {{ elevation of soil samples obtained, and indicate field monitoring performed. A E Legend to Logs is presented as Plate A-2 in Appendix A. Although transitions may be gradual, the stratification lines shown on the logs represent the approximate boundaries between soil types. The locations of the borings were determined by measurement from known landmarks. Elevations of the drill holes were approximat- ed by interpolation between map contours as was the top of casing of the f monitoring well. The location and elevation of the drill holes should be considered accurate only to the degree implied by the method used. All drill bits and auger stems were steam cleaned prior to the drilling of each drill hole to prevent cross-contamination. Each boring. was j logged by an SGD staff geologist, and the drill cuttings.were monitored with a PID (TIP-1 manufactured by Photovac International, Inc.). The TIP-1 is equipped with a 10.6-electron volt (eV) ultraviolet Lamp and an internal pump to draw the ; `4 - 4 sample with a flow rate of 275 milliliter per minute (ml/min) (see soil sampling 4 protocols below). The PID is calibrated with calibration gas. provided by --Alphagaz_at-a-concentration of--50-ppm.----- f �F k 5�t - - - r r¢5 ) .h r �a �