Table 11, continued
Columns
8,9,11,12
Target #/1OOmL

2115/01
2/22/01
3/1101
319/01
3/16/01
3123/01
3129/01
-4/5/01
4112/01
4/19101
4/26101
5/3/01
5110101
5/17/01
5/24/01
5131/01
6/6/01
6/11/01
6/14101
6/18/01
6/20101
6/25/01
6/27/01
7/3/01

Total
coliform
/ 100mL
6,768,575
17,500,000
3,000,000
24,192,000
5,475,000
17,329,000
14,800,000
12,000,000
24,192,000
7,701,000
32,200,000
6,300,000
39,900,000
51,200,000
25,900,000
27,200,000
22,800,000
14,600,000
13,400,000
15,531,000
47,300,000
24,900,000
24,196,000
14,600,000
24,900,000

E. coli
I100mL
485,100
496,000
318,000
408,000
278,000
908,000
324,000
594,000
285,000
173,000
1,313,000
613,000
455,000
780,000
313,000
862,000
1,529,000
1,000,000
1,259,000
1,789,000
5,172,000
2,187,000
2,603,000
2,000,000
1,722,000

fecal
coliform
/ 100mL
475,000
200,000
140,000
400,000
92,000
140,000
610,000
640,000
200,000
30,000
1,160,000
200,000
440,000
5,400,000
2,600,000
820,000
2,300,000
1,030,000
1,430,000
1,800,000
3,100,000
1,600,000
2,000,000
1,520,000
2,500,000

Enterococci
IlOOmL
24,015

38,730
30,760
2,000,000
3,255,000
910,000
246,000
213,000
31,000
96,000
31,000
54,750
54,750
20,000
20,000
86,640
30,000
31,000
52,000
97,000
40,000
30,760
98,000
30,000
18,500

Male-specific
coliphage I lOOmI
7559

96,000
41,000
140,000
62,000
100,000
20,000
30,000
400,000
570,000
410,000
240,000
970,000
2,300,000
440,000
450,000
200,000
300,000
140,000
340,000
370,000
490,000
290,000
750,000
270,000

Results and Discussion
The overall objective of this study was to determine if a variety of microbes in
septic tank effluents of varying qualities could in fact be removed by passage through
mound sand in a controlled laboratory environment. The results are summarized in a
series of tables below. All of the data is presented in pairs of tables Where the eight
columns dosed with the high quality effluent (BOD and suspended solids <30 mg/L) are
separated from the four columns that received the low quality septic tank effluent (BOD
and suspended solids>100).
In addition to the microbial occurrence data collected on the column effluents,
pH values were also determined. Table 12 presents the low, high and average pH values

23