Draft Environmental Impact Statement for Roca Honda Mine

Chapter 3. Affected Environment and Environmental Consequences
Figure 36. Daily streamflow in Rio San José at Gallup (USGS Gaging Station 8343000)
San Mateo Creek Flow
Flow conditions for San Mateo Creek are described based on data collected in two time periods:
historical and recent data. The historical data are from the early 1980s and were collected to
establish baseline hydrologic conditions prior to development of the Gulf Mt. Taylor Mine and
during subsequent mining and dewatering activities. The recent data were collected between 2008
and 2010 by RHR to establish baseline environmental conditions in the watershed.
The historical data include streamflow measurements and water quality analyses. Streamflow was
measured at:
• San Mateo Creek near San Mateo, NM (Station 08342600)
• Arroyo del Puerto near San Mateo, NM (Station 08342700)
• Temporary gages for a Mt. Taylor Mine Study
The two gaging stations operated in the late 1970s and early 1980s and measured mine water
discharge to San Mateo Creek above its confluence with the Arroyo del Puerto (which drains
DEIS for Roca Honda Mine, Cibola National Forest 119