SOUTH DAKOTA Department of
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Surface Water

Laboratory Results and Sampling Dates

The city of Townsville began discharging from its wastewater treatment facility on May 28 and sampled, as required by its Surface Water Discharge permit. The results from the city's laboratory are listed below (the abbreviations used in this table are defined below the table):

Date

Flow Rate

gpm

BOD

mg/L

TSS

mg/L

Ammonia

mg/L

Fecal Coliform

No./100 mL

pH

s.u.

Temperature

degrees F

May 28

275 

26

18

0.45

150

8.5

60

May 30

280

25

24

0.56

225

8.6

61

May 31

260

28

26

0.75

200

8.4

60

June 5

285

30

29

1.05

275

8.7

59

June 12

260

35

40

1.20

350

8.8

58

gpm = Gallons per minute, a measure of the flow rate

BOD = Biochemical Oxygen Demand

TSS = Total Suspended Solids

mg/L = milligrams per liter, a measure of the concentration of pollutants in the water

No. = Number

mL = Milliliter

s.u. = Standard Units, the measure of the pH (acidity or alkalinity) of the water, typically on a scale of 0-14.

Calendars for May and June are provided below to help illustrate the example.

MAY

Sunday Monday Tuesday Wednesday Thursday Friday Saturday
    1 2 3 4 5
6 7 8 9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28

Sampled

29 30

Sampled

31

Sampled

   

 

JUNE

Sunday Monday Tuesday Wednesday Thursday Friday Saturday
          1 2
3 4 5

Sampled

6 7 8 9
10 11 12

Sampled

13 14 15

Discharge Stopped

16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
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