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Y . <br /> tested below reporting limits. Refer to Table <br /> both tests. III for a summary of <br /> PLUME SIZE AND CONFIGURATION: <br /> The writer did not witness the removal of the tank, when it was <br /> noted that there was some discoloration to the soil. During the <br /> re-excavation operation, no visable discoloration or free product <br /> was noted; there was a gasoline odor present, but is was not <br /> Possible to determine the exact location of those odors. <br /> depth of about 10' , the odor was more pronounced; below thatbove depth <br /> it became fainter and fainter, with the strongest odor towards the <br /> south side of encountered dit <br /> d not he indicatenany distinct n. The rzones or layers 5eofmhigh <br /> permeability, and no free product was observed during the spoil <br /> removal , although as mentioned earlier, some was noted in selected <br /> samples. <br /> ESTIMATE OF AMOUNT OF PRODUCT LEAKAGE: <br /> There are no records available to indicate the amount of leakage, if <br /> any, during the years the tank wasi -1 service. Because the tank <br /> integrity .was confirmed just prior to removal, it is assumed that <br /> •:,a <br /> any Product leakage occurred either in the <br /> product <br /> the <br /> island, (which was determined to be leaking during lthe <br /> to )uor <br /> adjacent to the pump island. test, <br /> CONCLUSIONS: <br /> 1• <br /> All of the samples from the excavation tested clean for both <br /> Ethylene Dibromide and organic lead. <br /> �• Only one sample, SW-2W, had detectible levels of TPH-G. <br /> • An analysis of the LUFT manual procedures for estimating <br /> contamination levels that can be left in place without threatening <br /> ground water reveal that only two components in the bottom samples <br /> slightly exceed the limits derived from Table 2-1 of that manual; <br /> Toluene and Xylene in .sample 8-2S. All other components fall below <br /> the <br /> limits; (Exhibit K. ) <br /> 4. The soil type, Stockton Adobe Clay, has a !ow Storie Index, and <br /> imperfect drainage; it appears unlikely that vertical <br /> or horizontal <br /> fluid migration through such a medium would be very extensive. <br /> 5. Additional spoil removal and sampling is necessary from the west <br /> end of the site. <br /> RECOMMENDATIONS: <br /> The writer is in agreement with the enclosed letter from Mr. Voskes <br /> Of Normac Inc. , proposing additional spoil removal from the <br /> t� <br /> 5 <br />