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tested below reportznq limits. Refer to Table 11I for a summary of <br /> both tests. � <br /> � <br /> NN PLUME SIZE AND CONFIGURATION: <br />� <br /> The writer did not witness the removal oi the tant , when it was <br /> NN noted that there was some discoloration to the sozl . During the <br />� <br /> mm re-e,,cavation operation , no vzsable discoloration or free product <br /> wal; rioted, there was a gasoline odor present , but zs was not <br /> possible to determine the exact location of those odors. Above a <br /> NN depth of about 10 ° the odor was more pronounced; below that depth <br /> it became fainter and fainter , with the/ strongest odor towards the <br /> south side of the e<cavatzon. The character of the sediments <br /> NN encountereo did not indicate any distinct zones or layers of high <br />� <br />~~ <br /> permeability , and no free product was observed during the spoil <br /> removal , although as mentioned earlier , some was noted in selected <br /> NN samples' <br />� <br />� <br /> ESTIMATE OF AMOUNT OF PRODUCT LEA� A8E: <br /> NN There are no records available to indicate the amount of lea� age , if <br />� <br /> any, during the years the tank was in service. BOcause the tan� <br /> integrity con-firmed just prior to removal , it is assumed that <br /> any product lea� age occurred either in the product line to the pump <br />~~ island , (which was determined to be leaPing during the test , ) or <br /> adjacent to the pump island. <br /> NN CONCLUSlON9: <br /> 1 . All of the samples from the e cavatzon tested cloan for both <br /> N0 Ethylene Dxb, umzde and organic lead. <br />� <br /> Z1. Only one sample` SW-2W , had detectible levels of TPH-G. <br /> 3. An analvsz-, 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 e,ceed the limits derived from Table 2-1 of that manual ; <br /> Toluene and Xylene in sample 8-2S. All other components fall below <br /> NN the limits; (F hzbzt �'. ) <br /> 4 The soil type, Stoc| ton Adobe Clay, has a low Gtorze Inde , and | <br /> ^ | <br /> imperfect drainage; it appears unlibely that vertical or horizontal <br /> NN <br /> -Fluid migration through such a medium would be very e .tenszve. <br /> NN 5. Additional spoil removal and sampling is necessary from the west <br /> end of the site. <br /> NN 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 /> NN 5 <br />� <br />