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KLEINFELDER <br /> A-2 7 SOIL CUTTING DISPOSAL <br /> It is not anticipated that soil cuttings will be generated requiring disposal during the Geoprobe <br /> investigation <br /> A-2 8 GEOPROBE CLOSURE <br />' Upon completion of Geoprobe sampling, the borings will be close <br /> g d by backf lung the borings <br />' with a neat cement grout, or bentonite chips or powder <br /> i <br /> A-3 DRILLING AND SUBSURFACE SOIL SAMPLING <br /> A-31 DRILLING <br /> Soil borings are advanced using a truck-mounted drill rig, equipped with hollow stem augers <br /> Subsurface soil samples are collected from the soil borings While drilling, an experienced <br /> environmental geologist classifies the soil, logs the stratigraphy of the borings, and collects soil <br /> samples <br /> A-3 2 QUALITATIVE FIELD SCREENING <br /> An organic vapor detector, such as a Photovac TIP, using a photo-ionization detector (PID) or a <br /> Foxboro flame-ionization detector (FID), is used to provide a qualitative screening of each soil <br /> sample collected from the borings The organic vapor detector measures ionizable compounds in <br /> the air in parts per million by volume (ppmv) Field calibration is performed using a calibrated <br /> span gas Ambient air is used to set the instrument to zero The soil contained in the cone of the <br /> sampler or in a brass tube is exposed and screened with the organic vapor detector The vapor <br /> reading is noted as the field screening result <br /> For the protection of the drilling crew, the organic vapor detector also is used to measure the <br />' volatile concentrations in the breathing zone prior to and during the drilling of the borings Total <br /> ionizable hydrocarbon readings in excess of 1 ppmv may necessitate respiratory protection for <br /> the affected crew members This requirement is included in the complete field health and safety <br /> plan developed for the project prior to the start of field work <br /> 23-482276-BOO/CR96S276 A -3 October 17, 1996 <br /> Copyright 1996 Klemfelder,Inc <br />