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M KLEINFELDER ' of • the analytical results Upon completion of the drilling and sampling, the borings were closed with neat bentonite cement Linda Turkette and Diane Hinson of the SJCEHD were present to observe the borehole closure activities While sampling, an experienced environmental geologist, under the supervision of a registered geologist, classified the subsurface soil and logged the boreholes A copy of the Unified Soil ' Classification System used to classify the soil, and a log key are provided in Appendix C (Plates C-1 and C-2) Descriptions of the soil encountered in each boring and identification of the ' sampling intervals are also presented in Appendix C (Log of Borings, Plates C-3 and C-8) ' Soil encountered in the borings consists of silty sand from below an aggregate base covering the site to a depth of 1 to 2 feet below ground surface This aggregate base consists of asphalt, chip seal, and road base materials located on the surface of the site to a depth of approximately 1 5 feet Clay and silty clay were located below the silty sand and continued to the 25 foot termination depth of the boreholes Groundwater was not encountered in any of the borings 3 2 Qualitative Field Screening To provide a qualitative indication of volatile organic constituents in the soil and to monitor the vapor concentrations in the breathing zone of the drilling crew, a portable organic vapor analyzer (OVA) equipped with a photoionization detector (PID) was used to screen the samples in the field The OVA was used to measure total ionizable compounds in parts per million by volume (ppmv) relative to a calibration standard ' Each soil sample was screened in the field, and the PID readings were recorded on the boring logs PID readings above 0 ppmv were not observed in any of the samples A summary of the ' samples collected and the PID reading for each sample is presented on Table 1 ' For the protection of the field crew, the PID was also used to measure the total ionizable concentrations in the breathing zone prior to and while drilling the borings No consistent ' readings were noted in the breathing zone above I ppmv while drilling the borings 23-482276-AOO/TR950096 Page 7 of 12 October 19, 1995 ' Copyright 1995 Kleinfelder, Inc