Enterococci Results for Mill and Dividing Creeks Summer 2009

All Results shown as Enterococci CFU/100 ml

    5/20 5/27* 6/3* 6/10* 6/17* 6/24 7/1* 7/8 7/15 7/22 7/29 8/5 8/12* 8/19*
                               
  M1 400 900 4120 2020 1130 1380 2140 600 400 860 112 490 1770 6820
  M2 220 290 4400 440 170 40 740 10 10 80 40 128 340 3240
  M3 20 30 92 190 52 2 430 12 2 12 28 20 8 412
  D1 180 680 580 680 680 100 2160 40 124 110 144 92 180 2250
  D2 16 90 200 120 160 8 360 20 2 8 16 16 8 2850
  D3 16 88 8 100 64 2 430 12 4 4 12 20 8 336
  M7 190 220 2480 180 270 60 1720 100 120 330 80 550 560 3300
  M6 80 230 2420 260 360 10 1380 230 170 170 70 940 720 4200

*5/27: 0.73" of rain within 48 hours of sampling; *6/3: 0.19" rain within 12 hours of sampling; *6/10: 0.6" rain within 12 hours of sampling; *6/17: 0.84" rain within 24 hours of sampling; *7/1: 0.5" rain within 12 hours of sampling; *8/12: 0.8" of rain within 36 hours of sampling; *8/19: 0.93" rain within 18 hours of sampling

The level considered “safe” for swimming is less than 105 enterococci/100 ml; counts exceeding this value are shown in red. 

These data may not be used in another publication without written permission of Sally Hornor. 

Water samples are being collected and analyzed by Sally Hornor and her students at Anne Arundel Community College at the request of the Mill Creek Scientific Review Committee to allow continued monitoring of bacterial trends in Mill and Dividing Creeks.  This project is funded by Anne Arundel County Dept. of Public Works.   

 

Maps of these stations are available, courtesy of BayLand Consultants and Designers Inc: a map of Mill and Dividing Creek watersheds showing sampling locations, a close-up version of this map showing only the tidal stations, and a map showing the location of M6 and M7 in relation to the tidal stations is available here.  All stations are the same as previously sampled during the course of this study.  M1 and D1 are the furthest upstream tidal stations in Mill and Dividing Creeks while M3 and D3 are the furthest downstream stations.  M7 is just upstream of the Mill Creek pumping station while M6 is just downstream.  

Sally G. Hornor
Professor of Microbiology
AACC Environmental Center
410 777 2842