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• CRITICAL ELEMENTS <br />1. Air Quality <br />No direct, indirect, or cumulative impacts have been identified. <br />Signature of specialist: Loren Wickstrom 11-3-99 <br />2. Areas of Critical Environmental Concern (ACEC) <br />The area is not located within an area designated as an ACEC by the San Juan/San Miguel <br />Resource Management Plan. <br />Signature of specialist: Loren Wickstrom 11-3-99 <br />3. Cultural Resources <br />Direct Impacts - In 1997, National King Coal concluded a Class III, intensive surface inventory <br />of approximately 120 of the 160 acres involved in this lease modification. No archaeological or <br />historic sites or paleontological localities were located. The surveyed area included primarily the <br />steep slopes and bottom of Rattlesnake Gulch. The modification area, however, extends beyond <br />• the east rim of Rattlesnake Gulch and the surveyed area across a flat mesatop where it is more <br />likely that an archaeological of historic site may exist. However, the frequency of site <br />occurrences in this azea, based on adjacent inventory data, is low: one historic stone foundation <br />and three isolated prehistoric stone tools recorded within 1 miles radius ofthe modification azea. <br />Low levels of subsidence have been observed within other coal mining areas adjacent to the <br />modification area, however, they are not to the degree that the would impact surface resources <br />and aze limited to canyon bottoms where no sites have been found. Since there is no anticipated <br />surface disturbance on the proposed modification area and the incidences of sites in this azea is <br />low, no additional Class III surveys will be done. No direct, indirect or cumulative impacts to <br />cultural resources identified. <br />Indirect Impacts -Due to the low height of room and pillar mining, and the depth of overburden, <br />there is a low likelihood that subsidence will cause surface disturbance. <br />Cumulative Impacts -None have been identified. <br />Signature of specialist: Kristie Arrington 11/10/99 <br />4. Farmlands (prime or unique) <br />• l0 <br />