|
pH |
Grade A= |
never less than 6.0 |
| |
Grade B= |
below 6.0 in less
than 10% of samples, never below 5.0 |
| |
Grade C= |
never less than 5.0 |
| |
Grade D= |
at least one sample
was less 5.0 |
|
|
|
|
|
Alkalinity |
Grade A= |
median greater than
30mg/L (indicates little vulnerability to acidic inputs) |
| |
Grade B= |
median 20-30mg/L
(indicates moderate vulnerability to acidic inputs) |
| |
Grade C= |
median less than 20
mg/L (considered to be vulnerable to acidic inputs) |
| |
Grade D= |
median less than 15
ppm (very vulnerable to acidic inputs) |
|
|
|
|
|
Turbidity
|
Grade A=
|
median less than 5
NTU and exceeded the standard for trout waters of 10 NTU in less
than 10% of samples, but never exceeded 50 NTU |
| |
Grade B= |
median less than
7.5 NTU and never exceeded the 50 NTU standard |
| |
Grade C=
|
median less than 10
NTU and exceeded 50 NTU in less than 10% of samples |
| |
Grade D=
|
median greater than
10 NTU or exceeded 50 NTU in more than 10% of samples |
| |
|
|
|
Total Suspended
Solids
|
Grade A=
|
median less than 5
mg/L and maximum less than 100 mg/L - not measurable disturbed
by human activities |
| |
Grade B=
|
median less than
7.5 mg/L and exceeded 100mg/L in less than 10% of samples - low
to moderate |
| |
Grade C=
|
median less than
10mg/L and exceeded 100mg/L in less than 10% of samples -
moderate to high disturbance. |
| |
Grade D= |
median greater than
10mg/L or maximum exceeded 100 mg/L in more than 10% of samples
- high level of land disturbance |
| |
|
|
|
Conductivity |
Grade A= |
median less than 30
umhos/cm, never exceeded 100 umhos/cm |
|
|
Grade B=
|
median less than 50
umhos/cm, exceeded 100 umhos/cm in less than 10% of samples |
|
|
Grade C=
|
median greater than
50 umhos/cm, exceeded 100 umhos/cm in less than 10% of samples |
| |
Grade D= |
exceeded 100
umhos/cm in more than 10% of samples |
| |
|
|
|
Total Copper |
Grade A= |
never exceeded
water quality standard of 7 ppb |
| |
Grade B= |
exceeded 7ppb in
less than 10% of samples |
| |
Grade C= |
exceeded 7 ppb in
10-20% of samples |
| |
Grade D= |
exceeded 7 ppb in
more than 20% of samples |
| |
|
|
|
Total Lead |
Grade A= |
never exceeded
water quality standard of 10 ppb |
| |
Grade B= |
exceeded 10 ppb in
less than 10% of samples |
| |
Grade C= |
exceeded 10 ppb in
10-20% of samples |
| |
Grade D= |
exceeded 10 ppb in
more than 20% of samples |
| |
|
|
|
Total Zinc |
Grade A= |
median less than 5
ppb, never exceeded water quality standard of 50 ppb |
| |
Grade B= |
median less than 10
ppb, exceeded 50 ppb in less than 10% of samples |
| |
Grade C= |
median less than 10
ppb, exceeded 50 ppb in 10-20% of samples |
| |
Grade D=
|
median greater than
10 ppb or concentration exceeded 50 ppb in more than 20% of
samples |
| |
|
|
|
Total Phosphorous |
Grade A= |
median not above
0.10 mg/L |
| |
Grade B= |
median greater than
0.10 mg/L but less than 0.20 mg/L |
| |
Grade C= |
median greater than
0.20 mg/L but less than 0.30 mg/L |
| |
Grade D= |
median greater than
0.30 mg/L |
| |
|
|
|
Orthophosphate |
Grade A= |
median less than
ambient level of 0.05 mg/L |
|
|
Grade B= |
median between 0.05
mg/L but less than 0.10 mg/L |
|
|
Grade C= |
median greater than
0.10 mg/L but less than 0.20 mg/L |
|
|
Grade D= |
median greater than
.20 mg/L |
| |
|
|
|
Ammonia Nitrogen |
Grade A= |
never exceeded 0.50
mg/L |
|
|
Grade B=
|
never exceeded the
proposed ambient standard for trout waters in the summer of 1
mg/L |
|
|
Grade C= |
exceeded 1 mg/L in
less than 10% of samples, but never exceeded 2 mg/L |
|
|
Grade D=
|
exceeded 1 mg/L in
more than 10% of samples, or at least one sample had a
concentration greater than the proposed ambient standard for
trout waters in the winter of 2.0 mg/L |
| |
|
|
|
Nitrate Nitrogen |
Grade A= |
median does not
exceed 0.3 mg/L, no sample exceeded 1.0 mg/L |
|
|
Grade B= |
less than 10% of
samples exceeded 1.0 mg/L, non exceeded 5 mg/L |
|
|
Grade C= |
no samples exceeded
5 mg/L |
|
|
Grade D= |
at least one sample
exceeded 5 mg/L |
