221

Table 8.5.

Concentrations of Fe, Cr, and Pb from Column Tests and Water
Leach Tests. Concentrations from Column Tests are the Maximum
Concentration at the Onset of the Test.

Medium           Fe (g/L)         Cr (tg/L)       Pb ( tg/L)
Column     Batch   Column   Batch   Column Batch
Test      Test     Test    Test     Test   Test
Sand 1        720       96      N.A.a     1.1     22     0.4
Sand 2       2,309      659     15.8     1.6      36     0.9
Sand 4       2,322     1,483    28.6     2.5      42     1.7
Sand 10       823       256      N.A.     1.9      12     0.3
1,123      256     N.A.     1.9      N.A.   0.3
Sand 12       415       128      N.A.     0.8      12     0.2
324       128      N.A.     0.8     0.9    0.2
Peerless Iron   1,200     231      N.A.     13.1    N.A.    15
635       231      38.9    13.1      8      15
Torpedo Sand     278        8      20.5     1.4      11     0.08
a Not applicable.