Tom John (Leon County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 30°32'43", Longitude 84°12'51"
Period of record: 31 sampling dates; February 26, 1997 to December 30, 1999
Surface area (Shafer et al. 1986): 15 acres / 6 hectacres
Lake Region (Griffith et al. 1997): Tifton/Tallahassee Uplands
Geologic formation (Brooks 1981):
The geology is dominated by phosphatic sand, silty sand, and clay of the Hawthorne Formation.
Physiographic region (Brooks 1981):
The water body lies in the Tallahassee Red Hills subdivision of the State Line Hills division of the Ocala Uplift District.
Supplemental, unpublished water chemistry data, University of Florida.
Numbers reported below are the average for 1 month sampled:
|
pH |
7.4 |
Sulfate (mg/L) |
0.2 |
|
Total alkalinity (mg/L as CaCO3) |
13.0 |
Calcium (mg/L) |
3.1 |
|
Conductance (µS/cm @ 25 °C) |
57 |
Magnesium (mg/L) |
1.3 |
|
Color (Pt-Co units) |
19 |
Sodium (mg/L) |
6.1 |
|
Chloride (mg/L) |
10.5 |
Potassium (mg/L) |
1.3 |
|
Silicon (mg/L) |
0.3 |
|
|
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 31 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
32 |
49 |
63 |
|
Long-term total nitrogen concentrations (µg/L) |
520 |
820 |
1960 |
|
Long-term total chlorophyll concentrations (µg/L) |
12.7 |
35.0 |
106.7 |
|
Long-term Secchi depth (ft) |
1.5 |
3.7 |
4.8 |
1999 Florida LAKEWATCH Data
Numbers reported below are monthly averages calculated from 3 stations for total phosphorus (TP, µg/L), total nitrogen (TN, µg/L), chlorophyll (CHL, µg/L) and Secchi depth (SECCHI, ft) during 1999:
|
Date |
TP (µg/L) |
TN (µg/L) |
CHL (µg/L) |
SECCHI (ft |
|
Feb-18-99 |
48 |
820 |
29.7 |
3.7 |
|
Mar-11-99 |
53 |
960 |
18.3 |
3.5 |
|
Apr-23-99 |
56 |
830 |
14.0 |
3.2 |
|
May-20-99 |
48 |
710 |
13.7 |
4.3 |
|
Jun-09-99 |
52 |
840 |
23.7 |
. |
|
Jul-13-99 |
52 |
810 |
29.3 |
4.0 |
|
Aug-16-99 |
47 |
740 |
36.3 |
3.0 |
|
Sep-11-99 |
57 |
1090 |
74.7 |
2.6 |
|
Oct-26-99 |
60 |
1360 |
66.0 |
2.3 |
|
Dec-02-99 |
60 |
1140 |
42.3 |
2.6 |
|
Dec-30-99 |
42 |
750 |
31.7 |
3.3 |
|
|
|
|
|
|
|
1999 Average |
52 |
910 |
34.5 |
3.2 |