PERMFILE48898

• Permit No: C1981044
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: Appendix page 1 through A-2
• Section_Exhibit Name: EXHIBIT 15 FISH SURVEY OF THE WILLIAMS FORK RIVER
• Media Type: D
• Archive: No

TABLE. 2
~ DENSITIES (N0./FT2) AND PERCENT RELATIVE ABUNDANCES OF BENTHIC
HACROINVERTEB RATES COLLECTED BY SURBER SAMPLER AT
STATION 1, WILLIAMS FORK RIVER, M OFFAT
COUNTY, COLORADO, SEPTEMBER 12, 1979

Taxa Rep 1 Rep 2 Rep 3 Rep 4 X xRA
Ephemeropcera (Mayflies)
Baetis spp. 10 10 1 11 8.0 6.6
Choroterpes sp. -- -- 1 3 1.0 0.8
Ephemerella sp. 1 1 -- 1 0.8 0.6
E hp oro° sp. -- -- 1 9 2.5 2.0
Heptagenia sp. 11 7 1 24 10.7 8.6
Paraleptophlebia sp. -- 1 -- -- 0.3 0.2
Rithrogena sp. -- -- -- 24 6.0 4.8
Tricorythodes sp. -- -- -- 6 1.5 1.2
TOTAL 22 19 4 78 30.8 24.8
Plecoptera (Stoneflies)

Acroneuria abnormis --
1 --
1
0.5
0.4
Claassenia sabulosa 1 1 -- -- 0.5 0.4
Isogeniodes sp. 2 2 4 2 2.5 2.0
TOTAL 3 4 4 3 3.5 2.8
Hemiptera (True bugs)
Ambrysus sp. -- 1 1 -- 0.5 0.4
Trichoptera (Caddisflies)
Brachycentrus sp. 6 1 2 -- 2.2 1.8
Cheumacopsyche sp. 40 8 2 17 16.8 13.5
Helicopsyche sp. -- 8 -- 4 3-0 2.4
Hydropsyche so. A 18 3 1 -- 5.5 4.4
Hydropsyche sp. d 73 11 3 22 27.2 21.9
Unidentified species -- -- -- 1 0.3 0.2
TOTAL 137 31 8 44 55.0 44.2
Coleoptera (Aquatic beetles)
Stenelmis sp. 1 1 -- -- 0.5 0.4
Diptera (True flies)
Ablabesmyia sp. -- -- -- 3 0.8 0.6
Atherix variegata 1 -- -- 1 0.5 0.4
Cladotanytarsus sp. -- -- -- 1 0.3 0.2
• Cricotopus sp. 8 9 -- 17 8.5 6.9

14