additional six-month lag compared to the concentration increases detected in the source zone, as


expected due to the ten meter downgradient location of the sampling control plane and the low


groundwater flow. The higher concentrations were detected throughout the center of the transect


at MLS-10, and in the upper region of MLS-9.


Table 3-3. Sages downgradient transect natural gradient concentrations. Values are molar
 sum of all chlorinated species in mM. Transect is MLS-9, MLS-10, MLS-11.

 Well Depth 12/1998 01/1999 05/1999 05/2000 03/2001 02/2002 10/2002 10/2003 06/2004
 m bgs (mM) (mM) (mM) (mM) (mM) (mM) (mM) (mM) (mM)

 MLS-9 8.08 0.2487 0.3321 0.1325 0.0144 0.0682 0.4730 0.5224 0.0172 0.2264
 8.69 0.2908 0.3424 0.3014 0.3758 0.3553 0.3399 0.4522 0.2790 0.0711
 9.07 0.0360 0.0406 0.0847 0.0139 0.1896 0.1892 0.1187 0.7385 0.0261
 9.45 0.0301 0.0114 0.0168 0.0105 0.0142 0.0295 0.0553 0.2308 0.0268
 9.91 0.0063 0.0025 0.0180 0.0097 0.0650 0.0999 0.1349 0.1573 0.0474
 12.2 0.0059 0.0008 0.0347 0.0037 0.0016 0.0096 0.0083 0.0031 0.0000

 Mean 0.103 0.122 0.098 0.071 0.116 0.190 0.215 0.238 0.066
 Std Dev 0.130 0.168 0.109 0.149 0.135 0.184 0.217 0.269 0.082


MLS-10 8.08
 8.69
 9.07
 9.45
 9.91
 12.2

 Mean
Std Dev

MLS-11 8.08
 8.69
 9.07
 9.45
 9.91
 12.2

 Mean
Std Dev


0.0070
0.1904
0.3861
0.2835
0.1959
0.0019

0.176
0.168

0.0114
0.0476
0.0790
0.0381
0.1354
0.0011

0.060
0.050


0.0110 0.0062 0.0000
0.2140 0.1545 0.2046
0.3862 0.3280 0.8048
0.1855 0.3198 0.5237
0.3883 0.2352 0.4606
0.0017 0.0758 0.0109

0.195 0.194 0.361
0.190 0.143 0.348

0.0124 0.0127 0.0029
0.0765 0.0864 0.1447
0.1708 0.1518 0.2466
0.1396 0.1761 0.2332
0.1426 0.1107 0.1645
0.0009 0.0173 0.0016

0.106 0.108 0.158
0.068 0.062 0.098


0.0890 0.0410 0.0233
0.4228 0.4413 0.4515
0.3789 1.0312 0.0149
0.4049 0.3772 0.9959
0.4518 0.3887 0.8137
0.0063 0.0744 0.9836

0.249 0.376 0.566
0.224 0.405 0.505

0.0043 0.0060 0.0205
0.0718 0.1064 0.0815
0.1527 0.1344 0.0000
0.1724 0.2121 0.1235
0.1079 0.0948 0.0849
0.0005 0.0000 0.1363

0.101 0.110 0.085
0.068 0.076 0.053


 In Figure 3-3, Surfer visualizations are presented. In most of the control plane, increases


in detected concentrations were observed until peaking in year four, 2002, at 1.03 mM.


Reductions in aqueous chlorinated concentrations were observed from in the peak in 2002 until


the end of the sampling period in 2004, concluding at 0.33 mM. These changes will be further


examined through mass discharge evaluation in the next section.


0.2877
0.1516
0.0016
0.0000
0.0320
0.0000

0.010
0.014

0.0157
0.0086
0.0164
0.0545
0.3002
0.0074

0.077
0.126


0.0004
0.2157
0.0000
0.3330
0.0088
0.0030

0.069
0.148

0.0002
0.0027
0.0102
0.0314
0.0058
0.0000

0.010
0.013