AVERAGE VALUES
Places for analysis |
Ammoium nitrogen
(N mg/L) |
Nitrate nitrogen
(N mg/L) |
B_O_D_ 5
(O2 mg/L) |
C_O_D_
(O2 mg/L) |
Escherichia
coli
(UFC/100 mL) |
Total phosphorus
(P mg/L) |
Bettola - Vezzano |
0,03 |
4 |
2 |
8,75 |
4050 |
0,0325 |
rio Campola - V. s. C. |
0,0425 |
1,55 |
2,25 |
12 |
2660,75 |
1,34225 |
Roncocesi – Reggio Emilia |
0,0825 |
3,325 |
2,5 |
13 |
11972,5 |
0,1375 |
Begarola Cadelbosco di S. |
0,2175 |
3,8 |
5,25 |
40,75 |
30750 |
3,675 |
Bastiglia - Cadelbosco di Sopra |
0,5425 |
2,375 |
5,75 |
27 |
20775 |
0,575 |
S. Vittoria - Gualtieri |
0,56 |
4,925 |
4 |
24,75 |
21200 |
2,615 |
Guastalla |
0,45 |
4,15 |
3,5 |
25,5 |
22062,5 |
5,7875 |
Let's compare the average values of Crostolo stream in the year 2004 with the parameters given by current national law in the table below:
POLLUTION LEVELS
according to macro-indicators (Tab.7 All.I D.Lgs.152/99)
Parameter |
Level 1 |
Level 2 |
Level 3 |
Level 4 |
Level 5 |
BOD 5 (O 2 mg/L) |
< 2,5 |
£ 4 |
£ 8 |
£ 15 |
> 15 |
COD (O 2 mg/L) |
< 5 |
£ 10 |
£ 15 |
£ 25 |
> 25 |
NH 4 (N mg/L) |
< 0,03 |
£ 0,10 |
£ 0,50 |
£ 1,50 |
> 1,50 |
NO 3 (N mg/L) |
< 0,3 |
£ 1,5 |
£ 5,0 |
£ 10,0 |
> 10,0 |
Phosphorus t . (P mg/L) |
< 0,07 |
£ 0,15 |
£ 0,30 |
£ 0,60 |
> 0,60 |
E.coli (UFC/100 mL) |
< 100 |
£ 1.000 |
£ 5.000 |
£ 20.000 |
> 20.000 |
L.I.M. |
480 – 560 |
240 – 475 |
120 – 235 |
60 – 115 |
< 60 |
By comparing our data with the table, we can understand why ARPA (the Regional Board for Environment Protection) has classified the environmental state of the water at the mouth of Crostolo stream as poor or very bad .
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