Laserfiche WebLink
2003, 60 mg/I in 2001, 80 mg/I in 2000). The reason for low TDS levels water at PAW-1 <br />is not apparent. Sampling error does not seem to be the cause as this phenomenon <br />has occurred for marry consecutive years. Normally, alluvial water is slightly higher in <br />TDS, rather than considerably lower. Surface water TDS at adjacent station PRS-1 on <br />the Purgatoire River was measured at 120 mg/I. Possibly, PAW-1 is completed in the <br />natural alluvium and not affected by pre-law development waste that the surface water <br />is exposed to above ~ihe well location. <br />Quality changes due to mining are not apparent. Some alluvial water quality changes <br />would be expected due to the large amount of pre-law coal waste deposited in direct <br />contact with alluvial and surface waters. Water quality degradation from upstream <br />(PAW-1) to downstream (PAW-g) is again apparent but alluvial water quality at PAW-9 <br />remains relatively good and is acceptable for all uses. No impact to alluvial water from <br />mining activities is apparent. <br />Spring and Seep Survey <br />The spring and seep survey was not conducted in August this year due to coal bed <br />methane obstructions of roads and apparent impact to some spring locations. Past <br />monitoring has provided no evidence that mining activities has reduced or impacted the <br />springs in the area. <br />Summary <br />Monitoring frequency compliance was marginal in 2005 and 2006. Please explain the <br />excursions from the approved monitoring program. Surface water quantity and quality <br />changes are small to non-existent, and due to the possibility of only limited discharge, <br />surface water impacts are not anticipated. Potential mine pumping to the surface water <br />system could impact water quality downstream of the mine. Ground water quantity <br />impacts are not appairent or could not be determined due to lack of data. Flooding of <br />the workings continu~as at the rate estimated in the permit. <br />Please respond to this letter within 30 days of receipt. If you have any questions, <br />please call me. <br />Sincerely, <br />,~~~~~ <br />Kent Gorham <br />Environmental Protection Specialist II <br />