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GeoStrategies Inc. April 20, 1990 <br /> Soil Sampling <br /> Shallow soil borings will be drilled using a truck-mounted hoilow-stem <br /> auger drilling rig, unless site conditions favor a different drilling <br /> method Drilling and sampling methods will be consistent with ASTM <br /> Method D-1452-80 The auger size will be a minimum 6-inch nominal <br /> outside-diameter (O D) No drilling fluids will be used during this <br /> drilling method The augers and other tools used in the bore hole <br /> will be steam cleaned before use and between borings to minimize the <br /> possibilities of cross-contamination between borings <br /> Soil samples are typically collected at 5-Foot intervals as a minimum <br /> from ground surface to total depth of boring Additional soil samples <br /> will be collected based on significant lithologrc changes and/or <br /> potential chemical content Soil samples from each sampling interval <br /> will be lithologically described by a GSI geologist (Figure 1) Soil <br /> colors will be described using the Munsell Color Chart Rock units <br /> will be logged using appropriate lithologsc terms, and colors <br /> described by the GSA Rock Color Chart <br /> Head-space analyses will be performed to check for the evidence of <br />. volatile organic compounds. Head-space analyses will be performed <br /> using an organic vapor analyzer, either an OVA, HNU, or OVM Organic <br /> vapor concentrations will be recorded on the GSI field log of boring <br /> (Figure 1) The selection of soil samples for chemical analysis are <br /> typically based on the following criteria <br /> 1) Soli discoloration <br /> 2) Soil odors <br /> 3) Visual confirmation of chemical in soil <br /> 4) Depth with respect to underground tanks (or existing grade) <br /> 5) Depth with respect to ground water <br /> 6) OVA reading <br /> Soil samples (full brass liners) selected for chemical analysis arc <br /> immediately covered with aluminum foil and the liner ends are capped <br /> to prevent volatilization The samples are labeled and entered onto a <br /> Chain-of-Custody form, and placed in a cooler on blue ice for <br /> transport to a State-certified analytical laboratory <br /> Soil cuttings are stockpiled on-site Soils are sampled and analyzed <br /> for site-specific chemical parameters Disposition of soils Is <br /> dependent of chemical analytical results of the samples <br /> i <br /> Page 2 <br />