SITE INFORMATION AND CORRESPONDENCE

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need .� confirmation on interpretation. The tank was emptied and contents analyzed. They found high levels (350, 00 0 -ug/L) of toluene. The tank somehow filled with liquid again, a sample of the liquid was analyzed and 2100 ug/L of toluene was found. The guidelines discuss removing the contents and performing a visual inspection of the tank. If cracks or leaks or { visibly contaminated soil are seen then the tank and any contaminated soil is to 1 be remove and disposed of appropriately. So if there are no cracks, leaks x or visibly impacted soil, does that mean the tank can remain in place and sampling beneath it is not required? The consultant wants to remove the liquid and close the tank by filling it with clean material_ . Is this ok? Or�do they have to rinse the, tank until results indicate the rinseate contains no residual toluene. There were two soil samples collected beneath the leach lines. One was 30 i feet away from the tank because at 20 feet from the tank there was a tree stump, also there was a break in the leach line at this location, and the other at the end of the leach line (15 feet from the first sample) . Both { samples were ND for VOC's. Is this sufficient? w Depth to water at this site is about 90 feet. I don't think the contamination in the tank is a threat to groundwater. Can we take this into consideration before requiring more soil sampling? Secondly, we got the work plan for the Cal Trans site. Did you get a copy? They are only investigating the former leach line area and are sampling around the leach lines not beneath them. Is this appropriate or should be direct them to sample every 24 feet below each leach line? FILE CAre we supposed to copy you on all correspondence for UIC sites? Margaret 2