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KAPREALIAN ENGINEERING, INC. <br /> K E Consulting Engineers <br /> 535 Main Street <br /> Martinez, Ca. 94553 <br /> (41 5) 372.5444 <br /> KAPREALIAN ENGINEERING, INC. (KEI) <br /> Standard Operating Procedure Concerning Soil <br /> Sampling During Removal of Underground Fuel Tanks <br /> When any subsurface fuel tank is removed, whether for <br /> permanent site closure or tank replacement, the following <br /> activities shall be performed. <br /> 1 . Visual inspection of excavation. All excavation <br /> surfaces shall be inspected for evidence of <br /> leakage. Evidence of leakage would include stained <br /> soil , areas of free product, etc. The results of <br /> such inspection shall be documented. <br /> 2 . Two soil samples shall be analyzed from beneath the <br /> tank, one from directly beneath the fill pipe, the <br /> other from a similar position at the opposite end <br /> of the tank. If obviously stained or contaminated <br /> areas exist in locations other than the two above <br /> locations, then additional soil samples shall be <br /> analyzed from these obviously stained or <br /> contaminated areas or as instructed by the <br /> Regulatory Agencies. <br /> 3 . Soil samples shall be collected from the native <br /> soil at a minimum of two feet below the tank <br /> bottom. Samples shall be taken using a clean <br /> driven-tube type sampler, capped and sealed, and <br /> extruded in the lab in order to reduce the loss of <br /> volatile materials . <br /> 4 . The following soil sampling method shall be used at <br /> the tank removal site. <br /> - Immediately upon removal of the tank, a backhoe <br /> bucket of native soil shall be taken from the <br /> native soil/backfill interface or a minimum of 2 <br /> feet below the tank. This soil shall be rapidly <br /> brought to the surface. <br /> - Approximately three inches shall be rapidly <br /> scraped away from the surface of this soil , then a <br /> clean brass tube (at least three inches long) shall <br /> be driven into the soil with a wooden mallet. <br />