ALL IMPINGED ORGANISMS (excludes tadpole and corbicula and turtle)

StartDate Sum OfTotal Batch Count % of total 08-Nov-05 1 1% 22-Nov-05 1 1% 05-Dec-05 0 0% 19-Dec-05 0 0% 09-Jan-06 1 1% 30-Jan-06 0 0% 13-Feb-06 1 1% 27-Feb-06 3 3% 13-Mar-06 4 4% 27-Mar-06 10 11% 10-Apr-06 3 3% 24-Apr-06 5 5% 08-May -06 5 5% 22-May -06 1 1% 05-Jun-06 3 3% 19-Jun-06 6 6% 10-Jul-06 6 6% 24-Jul-06 11 12% 07-Aug-06 10 11% 21-Aug-06 3 3% 11-Sep-06 0 0% 25-Sep-06 4 4% 10-Oct-06 0 0% 23-Oct-06 17 18% 0 2 4 6 8 10 12 14 16 18**N u** **m b** **e r** **o f** **o r** **g a** **n i** **s m** **s**

14

95 Start Date 11/8/2005 11/22/2005 12/5/2005 12/19/2005 1/9/2006 1/30/2006 2/13/2006 2/27/2006 3/13/2006 3/27/2006 4/10/2006 4/24/2006 5/8/2006 5/22/2006 6/5/2006 1 7

0 2 4 6 8 10 12 14

Alabama shad

threadfin shad**N u** **m b** **e r** **o f** **e v** **e n** **t s** **( n** **= 2** **4 )** 6/19/2006 7/10/2006 7/24/2006 8/7/2006 8/21/2006 9/11/2006 9/25/2006 10/10/2006 10/23/2006

### NUMBER OF ORGA **NISMS IMPINGED PER EVENT** 

**FREQUENCY**

**OF SPECIES OCCURRENCE**

1 1 13

3 5

1 1 3

1 1

threadfin shad

common carp

weed shiner

channel catfish

flathead catfish

redbreast sunfish

green sunfish

dollar sunfish

largemouth bass

Gulf darter blackbanded darter 

### FREQUENCY

**OF SPECIES OCCURRENCE**StartDate Day Night 08-Nov-05 1 0 22-Nov-05 1 0

0 0 0 0 09-Jan-06 1 0

0 0 13-Feb-06 0 1 27-Feb-06 0 3 13-Mar-06 2 2 27-Mar-06 3 7 10-Apr-06 2 1 24-Apr-06 2 3 08-May -06 0 5 22-May -06 1 0 05-Jun-06 1 2 19-Jun-06 3 3 10-Jul-06 5 1 24-Jul-06 8 3 07-Aug-06 3 7 21-Aug-06 2 1

0 0 25-Sep-06 1 3

0 0 23-Oct-06 3 14

95

t-Test: Paired Two Sample for Means

Night Day Mean 2.333333 1.625 Variance 10.66667 3.63587 Observations 24 24 Pearson Correlation 0.349079 Hy pothesized Mean Difference 0 df 23 t Stat 1.099839 P(T<=t) one-tail 0.141391 t Critical one-tail 1.713872 P(T<=t) two-tail 0.282781 t Critical two-tail 2.068658 12

blackbanded darter

crayfishALL IMPINGED ORGANISMS (excludes tadpole and corbicula)

StartDate Sum OfTotal W eight % of total 08-Nov-05 7 1% 22-Nov-05 8 1% 05-Dec-05 0 0% 19-Dec-05 0 0% 09-Jan-06 7 1% 30-Jan-06 0 0% 13-Feb-06 0 0% 27-Feb-06 8 1% 13-Mar-06 11.3 1% 27-Mar-06 79.1 8% 10-Apr-06 15 1% 24-Apr-06 60 6% 08-May -06 47 5% 22-May -06 4 0% 05-Jun-06 226.3 22% 19-Jun-06 26.5 3% 10-Jul-06 159.1 15% 24-Jul-06 119 11% 07-Aug-06 114 11% 21-Aug-06 12 1% 11-Sep-06 0% 25-Sep-06 15 1% 10-Oct-06 0% 23-Oct-06 123.3 12% 0% 5% 10% 15% 20% 25%

1041.6

StartDate Sum OfTotal W eight 11/8/2005 7 11/22/2005 8 1/9/2006 7 2/13/2006 0 2/27/2006 8 3/13/2006 11.3 3/27/2006 79.1 4/10/2006 15 4/24/2006 60 5/8/2006 47 5/22/2006 4 6/5/2006 226.3 6/19/2006 26.5 7/10/2006 159.1 7/24/2006 119 8/7/2006 1148/21/2006 12 9/25/2006 15 10/23/2006 123.3Biomass by date

### relative Abund

Page 1 Alabama shad
threadfin shad

common carp
weed shiner
channel catfish
flathead catfish

redbreast sunfish

green sunfish
dollar sunfish largemouth bass
Gulf darter

blackbanded darter crayfish

### NUMBER IMP BY SPE BY EVNT

Page 1 Alabama shad

common carp

channel catfish

redbreast sunfish

dollar sunfish

Gulf darter

crayfish 

### 0 2 4 6 8 10 1211/8/200511/22/200512/5/200512/19/20051/9/20061/30/20062/13/20062/27/20063/13/20063/27/20064/10/20064/24/20065/8/20065/22/20066/5/20066/19/20067/10/20067/24/20068/7/20068/21/20069/11/20069/25/200610/10/200610/23/2006**N u** **m b** **e r** **o f** **f i** **s h** **i m** **p i** **n g** **e d**  Alabama shad
threadfin shad

common carp
weed shiner
channel catfish
flathead catfish

redbreast sunfish

green sunfish
dollar sunfish largemouth bass
Gulf darter

blackbanded darter crayfishSort SpeciesName 11/8/2005 ######## 12/5/2005 ######## 1/9/2006

#N/A #N/A Alabam a shad 66 Dorosoma petenense threadfin shad 1 68 Cy prinus carpio common carp 68 Notropis texanus weed shiner 81 Ictalurus punctatus channel catfish 81 Py lodictis olivaris flathead catfish 1 131 Lepom is auritus redbreast sunfish 131 Lepom is cy anellus green sunfish 131 Lepom is marginatus dollar sunfish 131 Micropterus salmoides largemouth bass 132 Etheostoma swaini Gulf darter 132 Percina nigrofasciata blackbanded darter 999 Cray

fish, unidentified cray fish 1

SUM 1 1 0 0 1

Wi nter Spr Sum Abun. 5 28 39 % 5.3 29.5 41.1 No. taxa 4 7 9

38664 threadfin shad 28 Alabam a shad 1 38678 channel catfish 24 threadfin shad 7 38691 cray

fish 14 common carp 1 38705 Alabam a shad 7 weed shiner 1 38726 redbreast sunfish 6 channel catfish 13 38747 largemouth bass 5 flathead catfish 3 38761 weed shiner 3 redbreast sunfish 5 38775 flathead catfish 3 green sunfish 1 38789 common carp 1 dollar sunfish 1 38803 green sunfish 1 largemouth bass 3 38817 dollar sunfish 1 Gulf darter 1 38831 Gulf darter 1 blackbanded darter 1 38845 blackbanded darter 1 cray fish 12 38859 38873 38887 38908 38922 38936 38950 38971 38985 39000 390131/9/2006 1/30/2006

2/13/2006 2/27/2006 3/13/2006 3/27/2006 4/10/2006 4/24/2006 5/8/2006 5/22/2006

6/5/2006 6/19/2006

7/10/2006 7/24/2006

7 2 5 3 1 3 1 1 5 2 3 2 1 1 1 2 1 1 1 1 1 1 1 1 1

1 2 1 1 1 1 1 1

0 1 3 4 10 3 5 5 1 3 6 6 11

fall 23 24.2 67/24/2006

8/7/2006 8/21/2006

9/11/2006 9/25/2006 ######## ########

Sum % of Total COUNT

7 7% 1 4 1 12 28 29% 7 1 1% 1 3 3% 1 1 2 2 24 25% 13 3 3% 3 1 1 2 6 6% 5 1 1% 1 1 1% 1 3 5 5% 3 1 1% 1 1 1 1% 1 1 1 2 14 15% 12

10 3 0 4 0 17 95 100%

95Sort SpeciesName 11/8/2005 11/22/2005 1/9/2006 1/30/2006 2/13/2006 2/27/2006 3/13/2006

#N/A #N/A Alabam a shad 66 Dorosoma petenense

threadfin shad 7 7 68 Cy prinus carpio

common carp 68 Notropis texanus

weed shiner 6.1 81 Ictalurus punctatus

channel catfish 1 5.2 81 Py lodictis olivaris

flathead catfish 8 131 Lepom is auritus

redbreast sunfish 131 Lepom is cy anellus

green sunfish 131 Lepom is marginatus

dollar sunfish 131 Micropterus salmoides

largemouth bass 132 Etheostoma swaini

Gulf darter 132 Percina nigrofasciata

blackbanded darter 999 Cray

fish, unidentified cray fish 7 0

SUM 7 8 7 0 0 8 11.32/27/2006

3/13/2006 3/27/2006 4/10/2006 4/24/2006 5/8/2006 5/22/2006 6/5/2006 6/19/2006 7/10/2006 7/24/2006 8/7/2006

8/21/2006 9/25/2006 10/23/2006

114 53.6 18.5 9 5 61.7 13.6

25.5 5 16 20 12.6 1 1.2 3 2 7 12 3.2 1 196.7 130 90 3 17.6 25 10 1 4.1 11 1 1 44 1 4 17 6 7 1 2 0 43

79.1 15 60 47 4 226.3 26.5 159.1 119 114 12 15 123.39/25/2006

10/23/2006

Sum % of Total 114 11% 161.8 16% 13.6 1% 6.1 1% 111.5 11% 12.2 1% 437.3 42% 25 2% 10 1% 16.1 2% 1 0% 1 0% 132 13%

1041.6 100%GeoSyntec Consultants

**Common Name Number of**  **organisms %**  **Biomass** kg **% Number of**  **organisms %**  Alabama shad 7 7% 114.0 11% blackbanded darter 1 1% 1.0 0% channel catfish 24 25% 111.5 11% common carp 1 1% 13.6 1% crayfish 14 15% 132.0 13% dollar sunfish 1 1% 10.0 1% flathead catfish 3 3% 12.2 1% green sunfish 1 1% 25.0 2% Gulf darter 1 1% 1.0 0% largemouth bass 5 5% 16.1 2% redbreast sunfish 6 6% 437.3 42% threadfin shad 28 29% 161.8 16% weed shiner 3 3% 6.1 1%

**TOTA L**  **95 1,042**  **TA BLE xxx. NUMBER A**  **ND BIOMA SS OF ORGANISMS COLLECTED DURING THE PLA**  **NT MITCHELL IMPINGEMENT STUDY, OCTOBER 2004-SEPTEMBER 2005** 

**Impingement Study Community Study** 

GK3396/GA060020/EPA-HQ-OW -2008-0667-DRAFT-2712.xls Page 1 of 1GeoSyntec Consultants

**Common Name Number of**  **organisms %**  **Biomass** kg **% Number of**  **organisms 95%**  **UCL   channel catfish 12 41% 52.7 27% 365 917 crayfish 4 14% 51.0 26% 122 306 dollar sunfish 1 3% 10.0 5% 30 76 flathead catfish 1 3% 8.0 4% 30 76 threadfin shad 8 28% 67.6 35% 243 612 weed shiner 3 10% 6.1 3% 91 229

** TOTA** **L 29**  **195 882**  **2,217**

* Annual estimate based on assumption that plant operates at full capacity () 365 days per year. ** 95% UCL calculated using FLUCL tool; non-parametric Chebyshev UCL used. **TA BLE xxx. NUMBER A**  **ND BIOMA SS OF ORGANISMS COLLECTED DURING THE PLA**  **NT MITCHELL IMPINGEMENT STUDY, NOVEMBER 2005-A**  **PRIL 2006 (50% COMPLETE)** 

**Impingement Study Annual Estimate ** *

GK3396/GA060020/EPA-HQ-OW -2008-0667-DRAFT-2712.xls Page 1 of 1Species SpeciesName SORT Family SORT

Anguilla rostrata threadfin shad 66 Clupeidae 66 My rophis punctatus weed shiner 68 Cy prinidae 68 Anchoa hepsetus flathead catfish 81 Ictaluridae 81 Anchoa mitchilli channel catfish 81 Ictaluridae 81 Opisthonema oglinum dollar sunfish 131 Centrarchidae 131 Brevoortia ty rannus tadpole 999 Not a fish 999 Notemigonus cry soleucas cray fish 999 Not a fish 999 Am eiurus nebulosus Corbicula 999 Not a fish 999

SpeciesName Count

OfTot alLen gth MinOfTotalLe ngth MaxOfTotalLength dollar sunfish 1 77 77.000 green sunfish 1 117 117.000 largemouth bass 5 43 88 redbreast sunfish 6 57 209.000 Alabam a shad 7 116 133.000 threadfin shad 28 51 135.000 common carp 1 124 124 weed shiner 3 47 72.000 channel catfish 24 41 121.000 flathead catfish 3 48 107.000 blackbanded darter 1 55 55.000 Gulf darter 1 47 47.000 cray fishCommon Family Name Herrings Dorosoma petenense Carps and Minnows Notropis texanus Catfishes Py lodictis olivaris Catfishes Ictalurus punctatus Sunfishes Lepom is marginatus Tadpole, unidentified Cray fish, unidentified Corbicula fluminea

AvgOfTotalLength Family

77 Centrarchidae 117 Centrarchidae 62.4 Centrarchidae 130.3333333 Centrarchidae 123.5714286 Clupeidae 81.57142857 Clupeidae

124 Cy prinidae 60.66666667 Cy prinidae 73.45833333 Ictaluridae

77 Ictaluridae 55 Percidae 47 Percidae