Lake Sammamish Beach All Years
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| Sample Date | E. Coli | Fecal Coliform | Temperature (C) | Temperature (F) |
| 9/22/2009 | | 1 | 20.0 | 68.0 |
| 9/15/2009 | | 32 | 20.0 | 68.0 |
| 9/8/2009 | | 42 | 20.0 | 68.0 |
| 8/31/2009 | | 2 | 22.0 | 72.0 |
| 8/25/2009 | | 5 | 21.0 | 70.0 |
| 8/18/2009 | | 27 | 22.0 | 72.0 |
| 8/11/2009 | | 20 | 22.0 | 72.0 |
| 8/4/2009 | | 21 | 27.0 | 81.0 |
| 7/28/2009 | | 9 | 26.0 | 79.0 |
| 7/21/2009 | | 7 | 24.0 | 75.0 |
| 7/14/2009 | | 2 | 20.0 | 68.0 |
| 7/7/2009 | | 5 | 19.0 | 66.0 |
| 6/29/2009 | | 4 | 20.0 | 68.0 |
| 6/23/2009 | | 1 | 19.0 | 66.0 |
| 6/15/2009 | | 1 | 21.0 | 70.0 |
| 6/9/2009 | | 2 | 21.0 | 70.0 |
| 6/2/2009 | | 2 | 22.0 | 72.0 |
| 5/26/2009 | | 7 | 17.0 | 62.0 |
| 5/18/2009 | | 1 | 17.0 | 63.0 |
| 5/12/2009 | | 1 | 11.0 | 52.0 |
| 9/16/2008 | 1 | 1 | 23.0 | 73.0 |
| 9/9/2008 | 7 | 5 | 23.0 | 73.0 |
| 9/2/2008 | | 12 | 21.0 | 70.0 |
| 8/26/2008 | 1,300 | 700 | 22.0 | 72.0 |
| 8/19/2008 | 50 | 33 | 22.0 | 72.0 |
| 8/12/2008 | 4 | 5 | 22.0 | 72.0 |
| 8/5/2008 | 5 | 5 | 22.0 | 72.0 |
| 7/29/2008 | 23 | 12 | 21.0 | 70.0 |
| 7/22/2008 | 1 | 3 | 23.0 | 73.0 |
| 7/15/2008 | 15 | 18 | 24.0 | 75.0 |
| 7/8/2008 | 3 | 3 | 22.0 | 72.0 |
| 7/1/2008 | 4 | 3 | 23.0 | 73.0 |
| 6/24/2008 | 4 | 2 | 19.0 | 66.0 |
| 6/17/2008 | 9 | 5 | 17.0 | 63.0 |
| 6/10/2008 | 44 | 25 | 13.0 | 55.0 |
| 6/3/2008 | 18 | 14 | 15.0 | 59.0 |
| 5/27/2008 | 11 | 6 | 17.0 | 63.0 |
| 5/20/2008 | | 2 | 15.0 | 59.0 |
| 5/13/2008 | 1 | 3 | 11.0 | 52.0 |
| 9/18/2007 | 15 | 17 | 21.0 | 70.0 |
| 9/11/2007 | 11 | 11 | 23.0 | 73.0 |
| 9/4/2007 | 21 | 22 | 22.0 | 72.0 |
| 8/28/2007 | 7 | 9 | 21.0 | 70.0 |
| 8/21/2007 | 119 | 135 | 21.0 | 70.0 |
| 8/14/2007 | 3 | 5 | 22.0 | 72.0 |
| 8/7/2007 | 13 | 10 | 22.0 | 72.0 |
| 7/31/2007 | 28 | 29 | 24.0 | 75.0 |
| 7/24/2007 | 9 | 7 | 22.0 | 72.0 |
| 7/17/2007 | 2 | 3 | 24.0 | 75.0 |
| 7/10/2007 | 3 | 2 | 24.0 | 75.0 |
| 7/2/2007 | 3 | 2 | 21.0 | 70.0 |
| 6/26/2007 | 3 | 5 | 19.0 | 66.0 |
| 6/19/2007 | 3 | 1 | 19.0 | 66.0 |
| 6/12/2007 | 2 | 2 | 20.0 | 68.0 |
| 6/5/2007 | 1 | 2 | 18.0 | 64.0 |
| 5/29/2007 | 24 | 16 | 18.0 | 64.0 |
| 5/22/2007 | 8 | 12 | 17.0 | 63.0 |
| 5/15/2007 | 2 | 7 | 17.0 | 63.0 |
| 9/19/2006 | 1,600 | 1,800 | 20.0 | 68.0 |
| 9/12/2006 | 1 | 2 | 22.0 | 72.0 |
| 9/5/2006 | 10 | 7 | 23.0 | 73.0 |
| 8/28/2006 | 11 | 12 | 23.0 | 73.0 |
| 8/22/2006 | 14 | 18 | 20.0 | 68.0 |
| 8/15/2006 | 4 | 5 | 23.0 | 73.0 |
| 8/8/2006 | 3 | 1 | 24.0 | 75.0 |
| 8/1/2006 | 4 | 2 | 23.0 | 73.0 |
| 7/25/2006 | 6 | 10 | 26.0 | 79.0 |
| 7/18/2006 | 4 | 6 | 23.0 | 73.0 |
| 7/11/2006 | 1 | 1 | 23.0 | 73.0 |
| 7/5/2006 | 23 | 12 | 21.0 | 70.0 |
| 6/27/2006 | 9 | 8 | 24.0 | 75.0 |
| 6/20/2006 | 2 | 4 | 19.0 | 66.0 |
| 6/13/2006 | 44 | 61 | 19.0 | 66.0 |
| 6/6/2006 | 14 | 13 | 20.0 | 68.0 |
| 5/30/2006 | 15 | 42 | 17.0 | 63.0 |
| 5/23/2006 | 67 | 83 | 16.0 | 61.0 |
| 5/16/2006 | 1 | 1 | 15.0 | 59.0 |
| 9/20/2005 | 2,400 | 2,000 | 21.0 | 70.0 |
| 9/13/2005 | 41 | 48 | 21.0 | 70.0 |
| 9/6/2005 | 32 | 49 | 23.0 | 73.0 |
| 8/30/2005 | 23 | 6 | 21.0 | 70.0 |
| 8/23/2005 | 23 | 43 | 24.0 | 75.0 |
| 8/16/2005 | 17 | 19 | 25.0 | 77.0 |
| 8/9/2005 | 2 | 1 | 26.0 | 79.0 |
| 8/2/2005 | 7 | 4 | 25.0 | 77.0 |
| 7/26/2005 | 24 | 25 | 26.0 | 79.0 |
| 7/19/2005 | 195 | 185 | 25.0 | 76.0 |
| 7/12/2005 | 47 | 16 | 21.0 | 70.0 |
| 7/5/2005 | 14 | 10 | 23.0 | 73.0 |
| 6/28/2005 | 8 | 5 | 20.0 | 68.0 |
| 6/21/2005 | 1 | 4 | 22.0 | 72.0 |
| 6/14/2005 | 2 | 3 | 18.0 | 64.0 |
| 6/7/2005 | 2 | 5 | 17.0 | 63.0 |
| 5/31/2005 | 2 | 4 | 18.0 | 64.0 |
| 5/24/2005 | 14 | 16 | 20.0 | 68.0 |
| 5/17/2005 | 5 | 5 | 16.0 | 61.0 |
| 9/21/2004 | 160 | 160 | 19.0 | 66.0 |
| 9/14/2004 | 32 | 31 | 20.0 | 68.0 |
| 9/10/2004 | 99 | 78 | | |
| 9/7/2004 | 2,000 | 1,800 | 19.0 | 66.0 |
| 8/31/2004 | 32 | 27 | 17.0 | 63.0 |
| 8/24/2004 | 20 | 37 | 23.0 | 73.0 |
| 8/17/2004 | 9 | 11 | 27.0 | 81.0 |
| 8/10/2004 | 15 | 23 | 26.0 | 79.0 |
| 8/3/2004 | 32 | 33 | 25.0 | 77.0 |
| 7/27/2004 | 2 | 3 | 26.0 | 79.0 |
| 7/20/2004 | 21 | 23 | 23.0 | 73.0 |
| 7/13/2004 | 1 | 1 | 24.0 | 75.0 |
| 7/6/2004 | 23 | 21 | 23.0 | 73.0 |
| 6/29/2004 | 14 | 7 | 24.0 | 75.0 |
| 6/22/2004 | 8 | 6 | 24.0 | 75.0 |
| 6/15/2004 | 2 | 2 | 20.0 | 68.0 |
| 6/4/2004 | 5 | 4 | 21.0 | 70.0 |
| 6/1/2004 | 18 | 26 | 18.0 | 64.0 |
| 5/25/2004 | 1 | 4 | 20.0 | 68.0 |
| 5/18/2004 | 1 | 3 | 20.0 | 68.0 |
| 9/16/2003 | 120 | 68 | 20.0 | 68.0 |
| 9/11/2003 | | 69 | 21.0 | 70.0 |
| 9/9/2003 | 14,500 | 13,500 | 24.0 | 75.0 |
| 9/2/2003 | 38 | 31 | 25.0 | 77.0 |
| 8/26/2003 | 23 | 17 | 23.0 | 73.0 |
| 8/19/2003 | 42 | 32 | 25.0 | 77.0 |
| 8/12/2003 | 44 | 41 | 26.0 | 79.0 |
| 8/5/2003 | 4 | 5 | 26.0 | 79.0 |
| 7/29/2003 | 22 | 14 | 28.0 | 82.0 |
| 7/22/2003 | 60 | 59 | 27.0 | 81.0 |
| 7/15/2003 | 20 | 35 | 25.0 | 77.0 |
| 7/8/2003 | 1 | 1 | 20.0 | 68.0 |
| 7/1/2003 | 1 | 1 | 23.0 | 73.0 |
| 6/24/2003 | 20 | 15 | 21.0 | 70.0 |
| 6/17/2003 | 17 | 31 | 23.0 | 73.0 |
| 6/10/2003 | 5 | 2 | 18.0 | 64.0 |
| 6/3/2003 | 6 | 7 | 22.0 | 72.0 |
| 5/27/2003 | 4 | 1 | 20.0 | 68.0 |
| 5/20/2003 | 25 | 13 | 16.0 | 61.0 |
| 5/13/2003 | 1 | 1 | 18.0 | 64.0 |
| 9/10/2002 | 1 | 1 | 22.0 | 72.0 |
| 9/3/2002 | 10 | 8 | 22.0 | 72.0 |
| 8/27/2002 | 23 | 43 | 25.0 | 77.0 |
| 8/20/2002 | 2 | 1 | 23.0 | 73.0 |
| 8/13/2002 | 38 | 36 | 25.0 | 77.0 |
| 8/6/2002 | 4 | 3 | 21.0 | 70.0 |
| 7/30/2002 | 3 | 1 | 23.0 | 73.0 |
| 7/23/2002 | 91 | 63 | 26.0 | 79.0 |
| 7/16/2002 | 22 | 9 | | |
| 7/9/2002 | 57 | 63 | 22.0 | 72.0 |
| 7/1/2002 | 4 | 3 | 21.0 | 70.0 |
| 6/25/2002 | 110 | 200 | 25.0 | 77.0 |
| 6/18/2002 | 2 | 5 | 17.0 | 63.0 |
| 6/11/2002 | 4 | 1 | 20.0 | 68.0 |
| 6/4/2002 | 3 | 1 | 19.0 | 66.0 |
| 5/28/2002 | 100 | 84 | 19.0 | 66.0 |
| 5/21/2002 | 1 | 1 | | |
| 5/14/2002 | 1 | 4 | 12.0 | 54.0 |
| 9/11/2001 | 20 | 9 | 22.0 | 72.0 |
| 9/4/2001 | 9 | 91 | 23.0 | 73.0 |
| 8/28/2001 | 50 | 60 | 24.0 | 75.0 |
| 8/21/2001 | 24 | 30 | 23.0 | 73.0 |
| 8/14/2001 | 400 | 400 | 25.0 | 77.0 |
| 8/7/2001 | 420 | 560 | 23.0 | 73.0 |
| 7/31/2001 | 40 | 40 | 21.0 | 70.0 |
| 7/24/2001 | 350 | 170 | 23.0 | 73.0 |
| 7/17/2001 | 60 | 50 | 20.0 | 68.0 |
| 7/10/2001 | | | 25.0 | 77.0 |
| 7/2/2001 | 140 | 85 | 23.0 | 73.0 |
| 6/26/2001 | 10 | 20 | 20.0 | 68.0 |
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