"Rio Blanco Oil Shale Company (RBOSC) has been conducting environmental monitoring studies on Tract C-a since September 30, 1977, when baseline and interim period inventory studies were completed. The monitoring studies have been conducted to assess the impact of oil shale operations on Tract C-a and the vicinity as development progresses. ... Monitoring studies have been conducted in accordance with the program described in the RBOSC Modular Development Phase Environmental Monitoring Program dated May 1977 and approved by Deputy Conservation Manager/Oil Shale (DCM/OS) on August 17, 1977. ... Revision 5.2 covered the period from January 1979 through December 1981. However, RBOSC has now modified their development plans and will begin construction of a surface retort, open pit mine, and associated ancillary facilities and corridors in the spring of 1981. In order to monitor potential environmental impacts of these operations, RBOSC has revised the monitoring program again. This program (Revision 6.1) is described in this document"--Page 1