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