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SOP #12 Date:9/1/93 Page 8 of 31 Typical equipment for sample filtration, if needed: • Two clean containers approximately 1-liter size • Organic-free deionized water • Peristaltic filtration pump • In-line plate filter • Filter membranes - 0.45 µ pore size 5.2 PROCEDURE Depending on the sampling activities to be performed, CPT testing will be conducted in up to three separate runs. The first run will be conducted to generate stratigraphic or hydrogeologic information. Penetration depths of over 100 feet below ground surface (bgs) are usually unattainable unless the soils are generally uncemented or unconsolidated and free of large-diameter gravels. The stratigraphic or hydrogeologic data will then be evaluated to determine optimum depth intervals to obtain soil and ground water samples, which will be collected in subsequent runs. The air monitor (a PID or FID) shall be checked at least once a day to ensure that it is calibrated and operational. A background reading shall be taken, and the instrument shall be re-set to zero each time the instrument is used. Health and safety equipment described in the Health and Safety Plan will be donned before proceeding to the sample location. Organic vapor readings measured in the breathing zone with an FID or PID will be used to determine if respirators are needed throughout the CPT sampling procedures. Details of conditions under which respirators are needed are specified by the Health and Safety Plan. Air monitoring readings will be recorded in the field notebook and/or on data collection forms. Although the number and type of soil samples to be collected may vary according to the Sampling and Analysis Plan (SAP), the sequence of steps will generally follow that described in this section. If a soil or water sample is to be submitted for laboratory analysis, the procedures for sample labeling, handling and tracking, described in Section 6.0 of this SOP, will be followed.