A case study of bacteria source tracking in the North Shore Channel

Transcription

1 A case study of bacteria source tracking in the North Shore Channel R. Gore1, G. K. Rijal1, M. Byappanahalli2, R. Whitman2, T. C. Granato1, C. O'Connor1; 1Metropolitan Water Reclama?on District of Greater Chicago, Cicero, IL, 2U.S. Geological Survey, Great Lakes Sci. Ctr., Porter, IN 2012 Illinois Water Conference September 24, 2012 Urbana, Illinois

2 OBJECTIVES Investigate the occurrence, distribution, and possible non-point sources of FIB in and along a portion of the NSC. (a) characterize the distribution of E. coli and enterococci in surface water and sediments above and below the NSWRP outfall along a segment of the NSC/NCBR, and (b) determine the potential contributions of E. coli and enterococci from nonpoint sources, such as stream bank soils and river outfalls, to the channel basin.

3 CAWS SAMPLING AREA Above NSWRP outfall Bridge Street (UPS-1)

4 CAWS SAMPLING AREA Above NSWRP outfall Oakton Street (UPS-2)

5 CAWS SAMPLING AREA

6 CAWS SAMPLING AREA NSWRP Outfall: NSOUT East River at Carmen/Albany: NBCR Tributary

7 CAWS SAMPLING AREA Storm Sewer Outfalls

8 CAWS SAMPLING AREA Below NSWRP Outfall Foster Avenue (DNS-1; WW-101)

9 CAWS SAMPLING AREA Below NSWRP Outfall Wilson Avenue (DNS-2; WW-37) North Shore Channel (Howard St. and North)

10 Sampling Events Depositional Erosional /Stream Bank

11 METHODS Sampling Events Triplicate samples of water and Sediments Five sampling events in Summer Fall of 2008 Wooded Grassy Soil/sediment samples from two recreational parks: Channel side Park Canoe Launch by Oakton St and East River Park by Albany/Carmen Ave.

12 SAMPLE ANALYSIS All water, soil, and sediment were analyzed for E. coli by the DST technique (IDEXX Colilert-18) Composited water and sediment samples were analyzed for enterococci using the membrane filtration (MF) technique with mei agar (USEPA 2000). ~ 10% of the presumptive E. coli (Colilert-18) and enterococci (mei) were confirmed (APHA 2005). Turbidity (2100N Laboratory Turbidity meter, Hach) Conductivity (EC500, Extech Instruments) Textural composition & organic carbon contents of sediment and soil were determined on composited samples (A&L Great Lakes Laboratories, Inc., Fort Wayne, Indiana).

13 RESULTS Water Densities (Log Mean) 4.0 Sediment MPN/100 ml water 3.0 MPN/g sediment Bridge Oakton Outfall Albany outfall Foster Wilson Location 1.0 Bridge Oakton Foster Wilson Albany outfall Location

14 MPN/100 ml water RESULTS Densities (Log Mean) in Water & Sediment E. coli enterococci E. coli enterococci MPN/g sediment Bridge Oakton Outfall Albany outfall Foster Wilson Location 1.0 Bridge Oakton Foster Wilson Albany outfall Location

15 RESULTS Densities in Storm Sewer Outfalls Date/24-hr Cumulative Rainfall (in) Storm Sewer E. coli (mean log MPN/100 ml) Evanston Lincolnwood 09/04/08 (2.69) /29/08 (0.60) /08/08 (1.20) /20/08 (0.22)

16 RESULTS Densities of E. coli in Four Recreational Parks Soil Stream Banks and Margins Forest Soils

17 F1 F2 F3 F4 F5 F6 F7 F8 RESULTS Densities of E. coli in Four Recreational Parks Soil LogE. coli (MPN/g) F9 F10 F12 F13 F14 F15 F16 F17 F18 F19 F20 Location F11

18 CONCLUSIONS Ø E. coli was consistently found in soils from the wooded, grassy, erosional/ stream bank, and depositional areas of the recreational parks. Ø E. coli and enterococci were consistently found in water and sediments at all sampling locations, with bacterial densities in water increasing below the NSWRP outfall. Ø On a relative measurement basis (i.e., 100 ml=100 g), both E. coli and enterococci densities were significantly higher in sediments than water.

19 SOURCES OF BACTERIA ü Tributaries, such as the North Branch of the Chicago River (NBCR); ü Soils along the river basin; ü Sediment ü Storm Sewers Ø Attainment of water quality criteria for Primary Contact recreational use will require reduction of both the point sources and nonpoint source contributions to FIB burden in the NSC.

20 FINAL REPORT HOW TO ACCESS THE MWRD REPORTS Click Reports >> M&R Data and Reports >> > Chicago Area Waterways User Attainability Analysis (UAA) HOW TO CONTACT Geeta Rijal, Ph.D., RM (NRCM) Telephone: (708) Fax: (708)