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k%J KLEINFELDER Soil samples will be collected by advancing the boring to a point immediately above the sampling depth and then driving a Modified California Sampler lined with three brass tubes into the undisturbed soil. The sampler will be removed from the bottom of the boring and the bottom leading tube sealed with aluminum foil and tight-fitting plastic caps. The sealed tube will be labeled and immediately stored in a cooler at 40C. At the end of drilling operations, select soil samples will be maintained under chain-of-custody procedures. The soil samples will be retained by Kleinfelder for 60 days in refrigerated storage for future reference or analysis. 3.1.2 Qualitative Field Screening A Photovac TIP, using a photoionization detector (PID) sensitive to aromatic and other gasoline related compounds, will be used to screen each soil sample collected from the soil borings. Calibration will be performed prior to use in the field using a 100 ppm isobutylene calibration gas. The field screening of the soil samples with the PID is intended to provide a qualitative indication of the presence of petroleum hydrocarbons. Selection of soil samples which may be submitted for chemical analysis will be based on the PID results. The screening procedure will consist of scraping the top soil layer in the middle tube to expose fresh soil and scanning the vapors emitted from the soil. The vapor reading will be noted and evaluated at the completion of the field work portion of the investigation to select samples for chemical analyses. For the protection of the field crew, the PID will also be used to measure the total volatile concentrations in the breathing zone prior to and during the drilling of the soil borings. Total ionizable hydrocarbon readings in excess of 5 ppm above background in the breathing zone will necessitate respiratory protection measures. This requirement will be outlined in a field safety plan for this project. 45-88-01 7