REP12031 - Laserfiche WebLink

Home Browse Search

DESCRIPTION OF THE HYDROLOGIC MONITORING PROGRAM The hydrologic program followed for the Carbon Junction Mine is described below. With the approval of Technical Revision 03 in April 1997, the original hydrologic monitoring program for the mine was modified. Technical Revision 03 modified the sampling frequency for springs and groundwater wells to semi-annual, with the exception of groundwater well 95-1, which was to be sampled quarterly in 1997, and semi-annually thereafter. The springs to be monitored were identified as 1, 2, and 4. The groundwater wells to be monitored were 17-B, 82-1, 82-4, and 95-1. During the review of Technical Revision 08 in late 1997, an in-depth analysis of the hydrologic monitoring program was undertaken. It was acknowledged that several springs and groundwater wells had been either mis-identified or identified with multiple designations. The hydrologic monitoring program was modified in the permit text to cleazly identify the springs and groundwater wells to be sampled. The current hydrologic monitoring program (page 5-36 of the permit document) requires the semi-annual sampling and analysis of springs 1 (upper Carbon Junction Canyon), 3 (REA Canyon below the mine), and 4 (Carbon Junction Canyon below the mine) when flowing, and the semi-annual sampling and analysis of groundwater wells 17-B (above the mine), 94-1 (mid-mine), and 95-1 (below the mine). • During the permit renewal process in 1998, Technical Revision 09 clarified the parameters to be analyzed when sampling is conducted (page 5-36a). Spring Monitoring Spring 1 (Upper Carbon Junction Canyon) did not flow during water yeaz 1998. This spring has been dry since the early 1980's. Spring 3 (REA SPG #3) and Spring 4 (CJ-LO- SPG #4) were monitored semi-annually during water year 1998 (January and June). Additionally, CDMG requested that Oakridge Energy sample discharge from the spring identified as the HauUoad Spring, located above the haulroad and below the south pit. This spring was sampled during the first quarter of water year 1999. Spring monitoring included afull-suite laboratory analysis as well as field parameters of pH, conductivity, temperature, and flow. Well Monitorin¢ The groundwater wells which were monitored in water year 1998 were 17-B (upgradient of the mine), 94-1 (located mid-mine), and 95-1 (located downgradient of the mine). All wells were monitored two times during water yeaz 1998; once during the second quarter (January 1998), and once during the third quarter (June 1998). Additionally, well 95-1 was monitored during the first quarter of the 1998 water year (October 1997). A full- -2-