ECKMANN/BISCHOFF, NEW RIVER CROSSING ISGS #43WETLAND MITIGATION SITEFAP 14Sequence #27Madison County, near Collinsville, IllinoisPrimary Project Manager: Steven E. Benton Secondary Project Manager: none

SITE HISTORY

C March 2009: IDOT tasked the ISGS to resume monitoring of the site.

C April 2009: ISGS installed a monitoring network at the site and resumed data collection.

WETLAND HYDROLOGY CALCULATION FOR 2010

We estimate that the area of the site that satisfied wetland hydrology criteria (EnvironmentalLaboratory 1987) in 2010 for greater than 5% of the growing season was 22.6 ha (55.9 ac) outof a total area of 23.1 ha (57.0 ac). The area of the site that satisfied wetland hydrology criteriafor greater than 12.5% of the growing season was estimated to be 20.9 ha (51.6 ac). Using the2010 Midwest Region supplement (U.S. Army Corps of Engineers 2010) to the 1987 Manual,we estimate that 21.8 ha (53.9 ac) satisfied wetland hydrology criteria for 14 or moreconsecutive days during the growing season. These estimates are based on the followingfactors:

C According to the MRCC, the median date that the growing season begins in nearbyBelleville, Illinois, is April 6 and the season lasts 199 days; 5% of the growing season is10 days and 12.5% of the growing season is 25 days. According to methods outlined inthe 2010 Midwest Region supplement, we estimate that March 11 was the starting dateof the 2010 growing season at this site based on soil temperatures measured at thenearby Fairmont City site.

C Total precipitation recorded at Belleville, Illinois weather station during the monitoring

period was 130% of normal and precipitation in Spring 2010 (March through May) was93% of normal. The largest areas of jurisdictional wetland hydrology for all three criteriaoccurred in April and May when on-site precipitation was 92% of normal.

C In 2010, water levels measured in soil-zone monitoring wells 2S, 3S, 4S, 5S, 6S, 7S, 8S,and 9S satisfied wetland hydrology criteria for more than 5% of the growing season. Water levels measured in soil-zone monitoring wells 3S, 4S, 5S, 7S, and 9S satisfiedwetland hydrology criteria for more than 12.5% of the growing season. Water levelsmeasured in soil-zone monitoring wells 2S, 3S, 4S, 5S, 6S, 7S, and 9S satisfied wetlandhydrology criteria for 14 or more consecutive days during the growing season as per the2010 Midwest Region supplement.

C Surface-water elevations measured at EBSW1 reveal that areas of the site at and belowan elevation of 124.10 m (407.17 ft) were inundated for more than 5% of the growingseason and that areas at and below an elevation of 124.05 m (407.01 ft) were inundatedfor more than 12.5% of the growing season. In addition, areas of the site at and belowan elevation of 124.10 m (407.17 ft) were inundated for 14 or more consecutive daysduring the growing season as per the 2010 Midwest Region supplement.

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ADDITIONAL INFORMATION

C In December 2009, the beaver dam in Schneider Ditch was breached by employees ofthe levee district. This caused a precipitous drop in surface-water elevation on the site. In March 2010, it was observed that the beavers had repaired their dam.

PLANNED FUTURE ACTIVITIES

C Monitoring of the site will continue until no longer required by IDOT.

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Eckmann/Bischoff, New River Crossing

Wetland Mitigation Site

(FAP 14)

Study Area and Vicinityfrom the USGS Topographic Series, Monks Mound IL, 7.5-minute Quadrangle

(USGS 1954, photorevised 1993)

contour interval is 10 feet

0

0

600 m

2000 ft

general study area

43

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44

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Sep 2009

Oct 2009

Nov 2009

Dec 2009

Jan 2010

Feb 2010

Mar 2010

Apr 2010

May 2010

Jun 2010

Jul 2010

Aug 2010

Sep 2010

Elevation (in m referenced to NAVD, 1988)

Wat

er-L

evel

Ele

vatio

ns in

Mon

itorin

g W

ells

Wel

l 1S

Wel

l 2S

Wel

l 3S

Wel

l 4S

Wel

l 5S

Wel

l 6S

Wel

l 7S

Wel

l 8S

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l 9S

45

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0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

Sep 2009

Oct 2009

Nov 2009

Dec 2009

Jan 2010

Feb 2010

Mar 2010

Apr 2010

May 2010

Jun 2010

Jul 2010

Aug 2010

Sep 2010

Depth (in m referenced to land surface)

Dep

th to

Wat

er in

Mon

itorin

g W

ells

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l 1S

Wel

l 2S

Wel

l 3S

Wel

l 4S

Wel

l 5S

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l 6S

Wel

l 7S

Wel

l 8S

Wel

l 9S

46

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0

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Sep 2009

Oct 2009

Nov 2009

Dec 2009

Jan 2010

Feb 2010

Mar 2010

Apr 2010

May 2010

Jun 2010

Jul 2010

Aug 2010

Sep 2010

Elevation (in m referenced to NAVD, 1988)

Wat

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Eckmann/Bischoff, New River CrossingWetland Mitigation Site

September 2009 through August 2010

Graph last updated September 29, 2010

0

1

2

3

4

5

6

7

8

9

10

11

12

13Se

p 20

09

Oct

200

9

Nov

200

9

Dec

200

9

Jan

2010

Feb

2010

Mar

201

0

Apr 2

010

May

201

0

Jun

2010

Jul 2

010

Aug

2010

Prec

ipita

tion

(inch

es)

Total Monthly Precipitation Recorded on Site and at the Southern Illinois University Research Center, Belleville, IL

monthly precipitation recorded at Belleville, IL (MRCC)

monthly precipitation recorded onsite by ISGS

data incomplete

1971-2000 monthly 30% above average threshold at Belleville, IL (NWCC)

1971-2000 monthly average precipitation at Belleville, IL (NWCC)

1971-2000 monthly 30% below average threshold at Belleville, IL (NWCC)

on-site rain gaugeremoved 12/02/2009installed 03/03/2010

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