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Sample ID <br />CO-C NAD27 feetni <br />r <br />Surface Eler° <br />(ft) <br />Top Threshold <br />Ekr (ft) <br />Bottom Threshold <br />Fier (ft) <br />2,061.150 <br />733.370 <br />6.593 <br />6,593 <br />6,590 <br />2.061.170 <br />7 33,350 <br />6.593 <br />6,593 <br />6,588 P7 <br />2,061.190 <br />733.330 <br />6.593 <br />6,593 <br />6,583 03 <br />2,061/30 <br />733360 <br />6,594 <br />6,594 <br />6,584 P> <br />2.061260 <br />733,400 <br />6.594 <br />6,594 <br />6,584 m <br />733,420 <br />6,594 <br />6,594 <br />6,584 P> <br />733,420 <br />6.593 <br />6,593 <br />6,583 (3) <br />733350 <br />6.588 <br />6,588 <br />6,583 P' <br />733,320 <br />6.585 <br />6585 <br />6,580 m <br />733,290 <br />6.582 <br />6,582 <br />6.579 <br />733.070 <br />6.580 <br />6.580 <br />6,572 > <br />733,020 <br />6,572 <br />6,572 <br />6,562 P> <br />732.980 <br />6.569 <br />6,569 <br />6,563 (3) <br />732,850 <br />6,557 <br />6,557 <br />6,551 (3) <br />6,557 <br />6,557 <br />6,550 0) <br />732.700 <br />6.549 <br />6,549 <br />6,544 P ) <br />7 32.550 <br />6,545 <br />6,545 <br />6341 >3 <br />6,601 <br />6,601 <br />6,587 m <br />6,590 <br />6.590 <br />6,585 (3) <br />0 <br />6.589 <br />6,589 <br />6 <br />6.590 <br />6,590 <br />6,586 P) <br />733,450 <br />6.587 <br />6,587 <br />6.577 <br />733.150 <br />6.590 <br />6,590 <br />6,584 <br />733,110 <br />6,580 <br />6,580 <br />6.573 <br />732,890 <br />6,575 <br />6,575 <br />6,557 m <br />DP -10 <br />'732,820 <br />6.562 <br />6,562 <br />6,560 (3 ' <br />DP -12 <br />732.800 <br />6.557 <br />6,557 <br />6,554 <br />DP -14 <br />732.740 <br />6.554 <br />6.554 <br />6,550 <br />DP -16 <br />732.310 <br />6,540 <br />6,540 <br />6,535 <br />DP -17 <br />732,270 <br />6,542 <br />6,542 <br />6,538 <br />732,720 <br />6,549 <br />6.549 <br />6,543 (4) <br />732.650 <br />6.552 <br />6.552 <br />6,547 (4 <br />732.590 <br />6.547 <br />6.547 <br />6,542 (4) <br />732,510 <br />6.544 <br />6,544 <br />6.538 (4) <br />732,430 <br />6540 <br />6,540 <br />6,533 co <br />TR -14 <br />732,900 <br />6,562 <br />PI <br />DP -9 <br />732,860 <br />6,567 <br />- m <br />DP -11 <br />732,850 <br />6.557 <br />-- m <br />DP -13 <br />732,720 <br />6.553 <br />rn <br />DP -15 <br />732.680 <br />6,555 <br />— t') <br />TR -OBS -1 <br />733,180 <br />6.588 <br />- -r <br />TR -OBS-2 <br />733,110 <br />6.585 <br />t6j <br />TR -OBS-3 <br />732.930 <br />6,564 <br />(s) <br />TR -OBS-4 <br />732,810 <br />6,557 <br />— of <br />Whetstone <br />Associates <br />Technical Memorandum <br />Table 1. Soil Sample Locations and Top and Bottom Elevations of Ra -226 Threshold Vertical <br />Boundaries <br />Notes: (1) Estimated from a map generated by field personnel <br />(2) Estimated =mg spot elevations from Great Divide Consulting 2010 site survey and contour lines from a 1990 mine facilities map. <br />(3) Locations where estimated value based on field observations is lower (more conservative) than value calculated from interpolation of <br />analytical radmm -226 results. <br />(4) Estimated using a qualitative comparison of gamma scan valves to soil sample locations with known radium -226 analytical results <br />(5) Sample location did not reach radium -226 threshold value <br />(6) Estimated that sample location did not reach radmm -226 t value based on a quahtative comparison of gamma scan values to <br />soil sample locations with known radium -226 analytical results <br />2.3 Estimation of Vertical Boundaries of Above- Threshold Material <br />The upper and lower vertical boundaries of material having radium -226 activity equal to or greater <br />than a threshold value of 7 pCiig was calculated based on soil sample radium -226 analytical results. <br />qualitative gamma scan analysis, and field observations. <br />4109C.110427 <br />35 <br />2 <br />