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• <br />APPENDIX I <br />RESPONSES TO SPECIFIC COMMENTS BY COLORADO <br />MINED LAND RECLAMATION DIVISION <br />The following responses correspond to the numbered comments in <br />CMLRD's letter to CYCC dated, March 12, 1986. <br />Spoil Aquifer Characteristics <br />1. CYCC plans to complete additional spoil piezometers during <br />1986 as part of the proposed spoil monitoring program. The <br />specific locations of the spoils piezometers will be finalized <br />following completion of the spoil spring and seep inventory <br />planned for May, 1986. It was recognized in the report that <br />potentiometric data for the spoils was limited, however, the <br />analysis was performed using existing data in order to comply <br />with CMLRD's request for a preliminary investigation of the cause <br />and effects of the spoils discharge. <br />• Additional piezometers should be installed updip from <br />selected major soil discharge areas to define the hydraulic <br />gradient towards these areas, and also to determine seasonal <br />variation in spoil water levels. The piezometers may also be <br />used for obtaining permeability data from the soils. water <br />quality data is not planned to be collected from the piezometers. <br />Water quality data from actual springs and seeps is more reliable <br />and more relevant for the evaluation of probable hydrologic <br />consequences. <br />2. Spoils piezometers will probably be completed using two inch <br />diameter PVC pipe as the primary purpose of the piezometers is <br />for the water level measurement. Single well response tests will <br />be run on all piezometers to obtain permeability data for the <br />spoils. These tests will be performed on some of the existing <br />piezometers during May or June of 1986, and on proposed piezome- <br />ters after completion and equalization of water levels. <br />3. Justification for use of three inches per year as a repre- <br />sentative recharge rate is given on page 3 of the final backfill <br />report. <br />4. An attempt was made to calculate the amount of water that <br />• infiltrates into the lower bedrock in the report by performing a <br />water balance over a sufficient period of time to minimize <br />storage effects. Unfortunately, a good data record on spoil <br />