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1 h" KLEINFELDER A-2.7 SOIL CUTTING DISPOSAL It is not anticipated that soil cuttings will be generated requiring disposal during the Geoprobe ' investigation. ' A-2.8 GEOPROBE CLOSURE Upon completion of Geoprobe sampling, the borings will be closed by backfilling the borings with a neat cement grout, or bentonite chips or powder. A-3 DRILLING AND SUBSURFACE SOIL SAMPLING A-3.1 DRILLING ' Soil borings are advanced using a truck-mounted drill rig, equipped with hollow stem augers. Subsurface soil samples are collected from the soil borings. While drilling, an experienced ' environmental geologist classifies the soil, logs the stratigraphy of the borings, and collects soil samples. ' A-3.2 QUALITATIVE FIELD SCREENING An organic vapor detector, such as a Photovac TIP, using a photo-ionization detector (PID) or a Foxboro flame-ionization detector (FID), is used to provide a qualitative screening of each soil ' sample collected from the borings. The organic vapor detector measures ionizable compounds in the air in parts per million by volume (ppmv). Field calibration is performed using a calibrated ' span gas. Ambient air is used to set the instrument to zero. The soil contained in the cone of the sampler or in a brass tube is exposed and screened with the organic vapor detector. The vapor ' reading is noted as the field screening result. ' For the protection of the drilling crew, the organic vapor detector also is used to measure the volatile concentrations in the breathing zone prior to and during the drilling of the borings. Total ionizable hydrocarbon readings in excess of 1 ppmv may necessitate respiratory protection for ' the affected crew members. This requirement is included in the complete field health and safety plan developed for the project prior to the start of field work. ' 23-482276-B00/CR96S070 A-3 June 26 1996 Copyright 1996 Kleinfelder,Inc.