a. 
b. 
Month 
Percent Area/ 
Volume 
Month 
Percent Area/ 
Volume 
Rank 
March 1998 
72 
April 1998 
55 
May 1998 
65 
June 1998 
75 
March 1999 
49 
April 1999 
34 
May 1999 
67 
June 1999 
25 
March 2000 
20 
April 2000 
39 
May 2000 
35 
June 2000 
50 
June 1998 
75 
1 
March 1998 
72 
2 
May 1999 
67 
3 
May 1998 
65 
4 
April 1998 
55 
5 
June 2000 
50 
6 
March 1999 
49 
7 
April 2000 
39 
8 
May 2000 
35 
9 
April 1999 
34 
10 
June 1999 
25 
11 
March 2000 
20 
12 
Figure VI-5. To develop a CFD for an area/volume, estimates of spatial extent of criteria exceedance for all of the 
sampling events conducted over a three-year assessment period (See Figure Vl-4b) are compiled (a). To prepare for 
developing the CFD the estimates of spatial extend of exceedance are sorted in descending order (b) and ranked. 
a. b. 
Percent Area/ Percent Area/ Cumulative Probability 
Month Volume Rank Month Volume Rank [Rank/(n+1)] 
June 1998 
75 
1 
March 1998 
72 
2 
May 1999 
67 
3 
May 1998 
65 
4 
April 1998 
55 
5 
June 2000 
50 
6 
March 1999 
49 
7 
April 2000 
39 
8 
May 2000 
35 
9 
April 1999 
34 
10 
June 1999 
25 
11 
March 2000 
20 
12 
100 
0.00% 
June 1998 
75 
1 
7.69% 
March 1998 
72 
2 
15.38% 
May 1999 
67 
3 
23.08% 
May 1998 
65 
4 
30.77% 
April 1998 
55 
5 
38.46% 
June 2000 
50 
6 
46.15% 
March 1999 
49 
7 
53.85% 
April 2000 
39 
8 
61.54% 
May 2000 
35 
9 
69.23% 
April 1999 
34 
10 
76.92% 
June 1999 
25 
11 
84.62% 
March 2000 
20 
12 
92.31% 
0 
100.00% 
Figure VI-6. To develop a CFD, estimates of spatial extent of criteria exceedance for all of the sampling events 
conducted over a three-year assessment period (see Figure VI-4) are compiled, sorted in descending order and 
ranked (a). Cumulative probability is calculated using the formula ’rank/(n + 1)' (b). 
chapter vi 
Recommended Implementation Procedures 
