Table 10-9. - Important Laboratory Tests

Test to be Sampling Point Recommended Means Recommended Performed of Collection

**Frequency

IDENTIFYING SAMPLES

After the sample is collected, it should be identified with a label. The label should include the following information:

Where the sample was taken

The date and time of collection use

The type of sample (grab or composite with the appropriate time and volume information)

Anything that might change before laboratory testing such as temperature, pH, and appearance

The initials or name of the person who took the sample

SEWAGE TESTING

Laboratory reports are useful in the operation of a wastewater treatment plant. The operator canlaboratory test results to keep the plant working at its best and to give early warning of operating problems. Laboratory testing programsvary with the type of treatment, size of the plant, local water quality requirements, and the NPDES permit requirements. Some of the most common laboratory tests for wastewater treatment plants are shown in table 10-9. They are discussed later in this chapter. Laboratory tests required by NPDES are determined for each treatment plant