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DRMS CEMEX M1977-208 Quarterly Report <br />April 6, 2009 <br />Page 2 <br />Analytical Data <br />The C-Pit pond water and groundwater samples taken on February 5 were analyzed for pH, <br />dissolved selenium, dissolved thallium, chloride, sulfate, and dissolved solids. Table 1 <br />summarizes the results, and the most recent analytical laboratory reports are enclosed with this <br />letter as an attachment. <br />Water Elevation <br />CEMEX continues to monitor the water elevation in the C-Pit pond by using a data logger to <br />record head data. Data is downloaded quarterly, and maintained for informational purposes in <br />case conditions change in the future. The kiln, and hence the cooling water tower, has been shut <br />down since December. Additionally, the pump in C-Pit for cooling water use was winterized in <br />October. Water levels will be re-evaluated in the second quarter of 2009. CEMEX has reduced <br />the water surface area remaining in C-Pit down to approximately a quarter acre. <br />There has been no in-flow of water through the west high wall in C-Pit in this quarter. <br />Observations will continue, and if other significant sources of inflow can be identified, corrective <br />actions will be evaluated. No seeps or springs down gradient of C-Pit have been observed. As <br />agreed upon in TR-9, we will continue to monitor for the presence of seeps or springs. <br />Discussion of results <br />C-Pit was originally a limestone mining pit of the Lyons Quarry; it was converted to a cement <br />kiln dust (CKD) disposal area associated with the Lyons cement plant, at the cessation of <br />extraction of limestone from the pit. The monitoring of C-Pit began based on observations of <br />increasing water in the pit, and subsequent elevated pH levels in the water. Under TR-04, a well <br />was drilled close to the CPit (CEM-001) to monitor for the potential movement of groundwater. <br />At that time, specific limits and standards were not established, because the presumptive use of <br />the water was agricultural, and a reference background source had not been established. A-Pit <br />was considered as a background source, but this approach was never finalized. The limits and <br />parameters presented here assume agricultural groundwater, which is the more conservative <br />standard in reference to selenium. No reference to a specific background source is established. <br />DRMS indicated that some migration without treatment for water with elevated parameters <br />might be acceptable as long as the migration was minimal in TR-04, in acknowledgement of the <br />close proximity of the well and the lack of a reference background. The two-week notification <br />provision of TR-04 was replaced with this quarterly report under later technical revision, along <br />with the establishment of CEM-004 and CEM-005 as the compliance wells.' TR-10 removed the <br />requirement for daily monitoring of wildlife. <br />' CEMEX agreed to notify DBMS within two weeks should any of the seven analytes selected exceed the most <br />conservative standard established in the compliance well, and to evaluate increased monitoring and remediation at <br />that time.