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need <br /> confirmation on interpretation. The tank was emptied and contents <br /> analyzed. <br /> They found high levels (350,000 ug/L) of toluene. The tank somehow <br /> filled <br /> with liquid again, a sample of the liquid was analyzed and 2100 ug/L of <br /> toluene was found. The guidelines discuss removing the contents and <br /> performing a visual inspection of the tank_ If cracks or leaks or <br /> visibly <br /> contaminated soil are seen then the tank and any contaminated soil is to <br /> be <br /> removed and disposed of appropriately. So if there are no cracks, leaks <br /> or <br /> visibly impacted soil, does that mean the tank can remain in place and <br /> sampling beneath it is not required? <br /> The consultant wants to remove the liquid and clo e the tank by filling <br /> it <br /> with clean material. Is this ok? Or�do they havl to rinse the tank <br /> until <br /> results indicate the rinseate contains no residual toluene. <br /> There were two soil samples collected beneath the leach lines. one was <br /> 30 <br /> feet away from the tank because at 20 feet from the tank there was a i <br /> tree i <br /> stump, also there was a break in the leach line a this location, and <br /> the <br /> other at the end of the leach line (15 feet from the first sample) . <br /> Both <br /> samples were ND for VOCs. Is this sufficient? <br /> Depth to water at this site is about 90 feet. I don't think the <br /> contamination in the tank is a threat to groundwater. Can we take this <br /> into <br /> consideration before requiring more soil sampling. <br /> I <br /> Secondly, we got the work plan for the Cal Trans site. Did you get a <br /> copy? <br /> They are only investigating the former leach line area and are sampling <br /> around the leach lines not beneath them. Is this appropriate or should <br /> _be <br /> direct them to sample every 20 feet below each leach line? <br /> Ate-we supposed to copy you on all correspondence for UIC sites? <br /> Margaret <br /> 2 <br />