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Mr. Bryce Romig • 4 • September 9, 1996 <br /> • Changes in water quality and efficiency of settling as the water cycles through the <br /> reservoir could not be determined during the initial sampling events as natural reservoir <br /> cycling was not occurring. During the May sampling event, water was being pumped <br /> from the east pond, which disrupted the natural flow direction through the reservoir. <br /> During the July sampling, water was segregated into shallow ponds which were not <br /> connected. During future sampling events, settling and metal attenuation will be <br /> evaluated by changes in TSS,pH, conductivity, and dissolved metal concentrations of the <br /> reservoir water. Should changes in indicator parameters warrant modification to the list <br /> of analytes, alterations will be discussed with Climax management. <br /> Soil Sampling <br /> Table 3 presents analytical results for soil sampling. As shown, concentrations of arsenic, <br /> mercury, selenium, and silver were below the method detection limit or the practical <br /> quantitation limit for both samples. This indicates a limited potential for these metals to <br /> be present in appreciable concentrations in the reservoir surface water. Furthermore, the <br /> absence of generally high metal concentrations in the soils (as compared to US EPA <br /> Industrial Soil Standards), suggests that water quality in the filled reservoir will not likely <br /> be compromised by interaction with the bottom materials. This will be further evaluated <br /> by performing synthetic precipitation leaching procedure (SPLP) tests on the soils, as part <br /> of the proposed analyses outlined in the SAP. <br /> • Recommendations <br /> TEC recommends that the first sampling of surface water, immediately following filling <br /> of the reservoir, be analyzed for the full suite of metals, inorganics, and geochemical <br /> parameters. Assuming the results of that sampling confirm the findings of these initial <br /> analyses presented in this transmittal, the analytes and parameters to be monitored during <br /> future sampling of Eagle Park Reservoir should follow the recommendations in Table 4. <br /> These recommendations are made because parameters not detected or detected in <br /> concentrations well below water quality standards under poor conditions are not expected <br /> to be present under the improved conditions that will exist after completion of <br /> reclamation. In addition, we recommend that analysis of total recoverable iron and total <br /> recoverable manganese be done on an intermittent basis. Analysis of these parameters <br /> will be triggered by an increase in TSS as compared to that measured in the initial <br /> sampling events, or if dissolved iron and manganese concentrations approach water <br /> quality standards. Dissolved iron and manganese will continue to be monitored through- <br /> out the sampling program. <br /> We further recommend that parameters for monitoring during water delivery from the <br /> Eagle Park Reservoir be re-evaluated after confirmation monitoring is complete. <br /> Improved conditions in the reservoir are expected to result in non-detection of cadmium <br /> • and substantial decreases in other parameters. <br /> C:\PROJECTS\6102-001\TI696102.00I[9-Sep-96] <br /> Environmental <br />