PERMFILE72464

• Permit No: C1996084
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 12 AQUATIC TECHNICAL REPORT
• Media Type: D
• Archive: No

t
Table A-2
• Lorencito Canyon Mine
Macroinvertebrate Bioassessment Metrics for
Stations in Cow Canyon, Lorencito Canyon, and the Purgatoire River
June 19-20, 1996
•

LC-1 Stream (Colic) Stations
LCD PRGTY-1 PRGTY-1a
PRGTY-2 Pond (Lentic) Stations
PCWC-2 PCWC-4
General Metrics
Total Abundance (#/sq.ft.) 102 316 120 197 64 90 64
Total Number Taxa 21 17 20 14 14 9 7
EPT Taxa 12 7 12 9 11 1 1
Dominant Taxon 23.6 53.3 24.0 31.8 30.4 40.1 57.0
Chironomidae 3.6 0.2 2.8 1.0 3.1 40.1 57.0
EPT/Chironomidae 24.09 424.50 33.40 94.83 30.33 0.23 0.06
Diversity Indices
Shannon (H) 3.19 2.07 3.03 2.60 2.56 2.28 1.72
Evenness (e) 0.57 0.29 0.55 0.57 0.57 0.67 0.57
Biotic Indices
HBI 3.5 4.2 2.3 2.1 2.1 6.9 6.7
CTO 70.8 69.9 55.0 55.3 60.6 101.7 104.3
°/a Composition Per Order
Ephemeroptera 66.9 85.9 57.7 35.3 56.5 9.3 3.6
Plecoptera 3.9 0.0 3.6 2.4 4.7 D.0 0.0
Trichoptera 16.1 3.8 31.8 58.4 34.0 0.0 0.0
Odonata 0.3 0.0 0.0 0.0 0.0 3.0 1.0
Diptera 10.5 4.8 6.1 1.7 4.7 40.5 60.1
Coleoptera 0.7 2.9 0.8 2.2 0.0 5.2 5.7
Hemiptera 0.7 0.0 0.0 0.0 0.0 18.6 29.5
Miscellaneous Taxa 1.0 2.7 0.0 0.0 0.0 23.4 0.0
Notes:
Many of the above metrics are not applicable for two lentic stations and are included for general information only
ADUntlance Untlsr cMSn rypae o/ sVeseee. This value may be Inaeasetl lby lplerant organisms) or retlumtl (by bwernp Ina number of nomolaranl prgansms)
Total a of Teu The IWl numbw of lva (nrllnsul generally inceassa wilh mmesmg piooc mntlM1lon.
EPT Taaa Ths lolal number of outlna teas within the ortlen Epnemaroptera, Plemptera. antl TrIrlloptera
This vaNa wmmar2ss lua rcflnese wilnln the ~nsM ortlen gemerally mnsderlp sensnwe to pollullon
% Dominant Tason Tha psrunl mntnDUaon of Iha moil numerous taaon tountl Unmstumetl enwronmenu generally support mmmunibes
hawnp large Humbert of speoea wile no intlwiouel spores present in overvmelming aDUntlen°e.
'%Chironomitlu Tha permnl mntrlDUnon of lhafamAy rnimnomitlae DisproporDOneW agmipdnG al the generally lolaram group uswlly intliwmc ppor0iot¢mnmhon.
EPT/CDlronomltlae Skewetl pppulaepn Hanng a tlispromnipnate number of me Ioleranl rhnonimitls relatwa to Ina more senneve EPT group may intlimro anvlmnmantal sVes
Shannon H A tlwarsily Intlea wnara nlatwe a°untlanms os the tlMersnt lane are Iaken into account
In general, values from 3 to 5 intlimte Gaan water Igootl) 1 to 3 motlerately pplluletl walar (laid, and values below 1 intlimle Heavily pollutetl welar (popr)
Evenneee Tha measure of now evenly Iha Inonitluals ere oislnoutetl among sperJes Values greater Nan 0 5 ere ronsloeretl to rllaraaerize
natural stream mmmuniilea Evan slight levels pl Oegre°Mim pyl retluce evennee Delew 05, antl generally Delpw 0 3
HBI The HBI (motleietl Hilsenhotl Diohc mtleal summanxea the bemm~: mmmuniry's overall IOlerinn Ip ppllNipn
O.OOJ ]5 (e.meanll. ] ]6<351very gooal. a 25-500lgooo). 50.-5 ]5 (tan). 5 ]6fi 5 (Ia~M mop.6 51-1.25 (Pmrl. antl ]26-t0 00 (very poorl
.
CTD (COmmuniry Toleranu Duoaen0. 61mnar to Ina MBI, earn mtlwitlual oryanism in a sample Has a praaseignetl lolaram<value
Mean values range Irom d0lo 108. The higher num0ers Irbirale more tolerant mmmunmes ano may show slresse.] mnoilions.
6