Laserfiche WebLink
Lorencim Canvon Mine - Aauaric Terhnical ReOart <br />• No threatened or endangered fish or other aquatic species were found within the analysis area. <br />The USFWS (USFWS, 1996) identified two T&E fish species as potentially occurring in the study <br />area, the Arkansas darter (Etheostoma cragini, candidate), and the Arkansas River population of <br />the speckled chub (Ertrarius aestivalis tetranemus, special concern). Neither of these species were <br />found during the fish inventory. Additionally, no critical habitat for any threatened or endangered <br />aquatic species occur within the analysis area. Populations of flathead chub (formerly classified <br />as a federal candidate species) were observed within the permit area. <br />Macroinvertebrates <br />Macroinvertebratebioassesment metrics for the seven sample stations are presented in Table A-2. <br />Additionally, raw taxa and abundance data are presented in Appendix A-1. <br />The metrics indicate that the macroinvertebrate communities of the stream stations are in fair to <br />good condition. The majority of the abundance and taxa came from the orders Ephemeroptera, <br />Plecoptera, and Trichoptera (EPT) ranging from 86.9 to 96.1 percent of the total abundance <br />(Table A-2). Members from these three orders are generally considered to exist in clean waters <br />and will generally be eliminated or depressed in disturbed environments. Diversity ranged from <br />• fair to good and total number of taxa ranged from 14 to 21. Additionally, biotic condition <br />(exemplified by HBI) ranged from very-good to excellent ratings. <br />Because Lorencito Canyon is an intermittent stream, these good metric ratings found at Lorencito <br />Canyon stations represent healthy conditions. As with the fisheries data, the macroinvertebrate <br />data indicate that LC-1 and LC-4 are within perennial reaches of Lorencito Canyon. <br />Many of the metrics applied to the stream stations data are not applicable for pond (lentic) stations. <br />However, all metrics are presented for the Cow Canyon pond stations for general information <br />(Table A-2). As is typically found in stagnant stock ponds, these stations data indicate that the <br />macroinvertebrate communities are limited and are comprised primarily of tolerant organisms <br />(Appendix A-1). <br />Periphyton <br />Periphyton bioassessment metrics for the 5 stream stations are presented in Table A-3. <br />Additionally, raw taxa and abundance data for diatoms and nondiatoms are presented in Appendix <br />A-2. <br />• <br />aquuic.475/April 24, 1997 5 (revised 4/24/97) <br />