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Regional Board Staff Recommendations 10 August 1990 <br /> Preliminary Site Investigation <br /> The number of samples required was calculated in accordance with <br /> Subchapter 16 , Section 2672d. 1 specifications . The chart <br /> presents two cases: Case A (no water in excavation) , only soil <br /> samples are required; and Case B (ground water in excavation) , <br /> both soil and ground water samples are required. The following <br /> sections explain soil and ground water sampling procedures . <br /> (ADDITIONAL TO LUFT) <br /> CASE A <br /> Water is Not Present in the Tank Pit - Soil Samples Required <br /> Soil samples are to be collected from beneath the tank pit a <br /> maximum of two feet into the native soil. The location and <br /> number of samples is specified in Table #1 . If obviously stained <br /> or contaminated areas are detected in locations other than the <br /> specified locations, then additional soil samples are to be taken <br /> from the stained or contaminated areas . <br /> Samples are to be taken using a driven-tube type sampler, capped <br /> and sealed with inert materials (see below) , and extruded in the <br /> lab in order to reduce the loss of volatile materials . Formal <br /> signed chain-of-custody records are to be maintained for each <br /> sample and submitted with the analytical results to the <br /> regulating agency. [SUPPLEMENTS SECTION II D. l .a S b OF LUFT] <br /> The following alternative sampling method may be used if samples <br /> cannot be safely collected from the excavation by the above <br /> method: <br /> - Immediately upon removal of the tank, a backhoe bucket of <br /> native soil from each sample location is to be taken from the <br /> native soil/backfill _ interface . This soil is to be rapidly <br /> brought to the surface. <br /> Approximately three inches of soil is to be rapidly scraped <br /> away from the surface, then a clean brass tube (at least three' <br /> inches long) is to be driven into the soil with a suitable <br /> instrument (e.g. a wood mallet or hammer) . The ends of the tube <br /> are covered with aluminum foil, then plastic end caps, and <br /> finally wrapped with a suitable tape such as duct tape . Once <br /> properly capped, the samples are to be immediately placed on ice, <br /> or dry ice , for transport to a laboratory. Formal chain-of <br /> custody records must be maintained and submitted for each sample . <br /> All piping must be removed and soil samples taken every 20 lineal <br /> feet . Soil samples from piping trenches are to be collected in <br /> tubes , capped, stored, and transported as described above . <br /> 13 <br />