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
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