Laserfiche WebLink
Laboratory anal: <br />The wells are sampled in a sequence that follows the order of least to <br />greatest level of salinity. At the end of 2013 this sequence continued to be: <br />(1) FPW, (2) AMW-1, (3) DH -96, (4) DH -122, (5) SMW-2 and (6) AMW-2. <br />Ash Monitor Well No. 2 (AMW-2) still continues to recharge following the <br />conclusion of the A -Pit reclamation activity. This process has been <br />ongoing since the end of 1999 when A -Pit reclamation was completed, but <br />only since 2004 has it resulted in volumes sufficient to allow sampling. <br />Adequate water volumes were found in this well during each of the <br />samplings for 2015, making it possible to obtain samples following the <br />standard three -well volume purge procedure. While the well bore water <br />level recovery following testing remains slower, higher static water levels <br />provide evidence that the highly disturbed zone in the reclaimed overburden <br />area is recharging. The timeline for this recharge is consistent with previous <br />predictions. <br />Copies of the analytical laboratory test results are found in the pages <br />following this text. Each ground water monitoring well was sampled in <br />accordance with the "permit procedure". The `B" designation following the <br />well identification confirms that the laboratory sample was obtained after <br />initial field sampling, well purging and a subsequent (second) field <br />sampling. The 2015 ground water monitoring test results remain consistent <br />with results from previous year's analyses in that there have been no <br />confirmed statistical exceedences, with but one exception, the samples <br />obtained from the SMW-2 well during 2004. The SMW-2 well is <br />completed in the disturbed spoil material which is being subjected to slow <br />re -saturation by ground water, and appears to be leaching dissolved <br />minerals as the water table rises. This has caused manganese concentrations <br />to somewhat exceed the calculated tolerance limit. CEC addressed this <br />tolerance limit exceedence with CDPHE during 2005, and was granted <br />permission to continue the current detection monitoring program [Doty & <br />Associates letter dated 04/08/05, "Alternate Source Demonstration, <br />Statistically Significant Increase Over Background Manganese in SMW-2, <br />Fourth Quarter 2004, Keenesburg Disposal Facility "J. <br />The direction of ground water flow, to the extent that it has been <br />documented in the area of the Keenesburg Mine property, trends <br />downgradient to the northeast. Recharge of the aquifer in the "spoil area" <br />continues to be limited to a single source, the localized infiltration of <br />