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minerals". The activity is essentially the same as exploration drilling and exploration <br />drilling has occurred under the existing plans. <br />2) H 1790 Appendix 4 J #3: "Conducting preliminary hazardous materials assessments and site <br />investigations, site characterization studies and environmental monitoring. Included are <br />siting, construction, installation and/or operation of small monitoring devices such as wells, <br />particulate dust counters and automatic air or water samples." Installation of monitoring <br />wells is specifically mentioned. <br />This categorical exclusion is appropriate in this situation because there are no extraordinary <br />circumstances potentially having effects that may significantly affect the environment. The proposed <br />action has been reviewed, and none of the extraordinary circumstances described in 516 DM2 apply. <br />BLM MANUAL Rel. 1-1710 Supersedes Rel. 1-1547 01/30/2008 Appendix 6 - 158 H-1790-1 - <br />NATIONAL ENVIRONMENTAL POLICY ACT HANDBOOK-(Public) BLM MANUAL Rel. 1-1710 <br />Supersedes Rel. 1-1547 01/30/2008 <br />I considered the impacts of this project, which would be negligible as compared to the existing <br />impacts on the ground for the existing mine. Installation of monitoring wells is needed to evaluate <br />further mining at the site, as well as the level of existing impacts at the site. Not installing the <br />monitoring wells could potentially have a greater effect than installing them, because ongoing <br />contamination, if any, would remain undetected for a greater period of time. <br />D: Signature <br />Authorizing Official: Date: <br />(Signature) <br />Name: Tom Rice <br />Title: {' Manager <br />• yk?E- Pr?i G/• <br />ct Jam <br />es Blair <br />Geologist <br />BLM Dolores Public Lands Office <br />29211 Hwy 185, Dolores, CO 81323 <br />James Blair, r blm.gov <br />970-882-6862 <br />Attachment 1 - Review of this project related to extraordinary circumstances <br />1. This project will not have significant adverse effects on public health and safety. <br />2. This project is not located on such natural resources and unique geographic <br />characteristics as historic or cultural resources; park, recreation, or refuge lands; <br />wilderness areas; wild or scenic rivers; national natural landmarks; sole or principal <br />drinking water aquifers; prime farmlands; wetlands (E. 0. 11990), floodplains (E. 0. <br />11988); national monuments; migratory birds; and other ecologically significant or <br />critical areas. <br />Denison Topaz Monitoring Wells CX <br />Page 4 of 5