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Field Trips 2011/12
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AP Environmental Science Field Trip 2011-2012: Data Collection


These two files contain all of the testing protocols and background information. (Watch out, they're about 4 MB.)


Hello everyone! APES people, feel free to elaborate anytime.

This Feild Trip took place at three sites: once in the Tujunga Wash and twice in Hansen Dam.
Tests were conducted to assess the overall quality of the water. The water was tested in seven ways.
  • Turbidity:
Turbidity is the cloudiness of the water, caused by floating solids invisible to the naked eye. This test was done using a turbidity sensor. Distilled water was used as standard clear water. The sensor compared the sample from the river or lake to the not turbid distilled water.
  • Total Dissolved Solids (TDS)
Total dissolved solids is the amount of dissolved organic and inorganic material in water. It was measured using a TDS meter.
  • Coliform Bacteria
Coliform is a fecal bacteria, making it a good indicator of water quality. This was measured by taking water samples, putting them into small airtight packs, and counting the amount of bacteria colonies after (I DON'T KNOW, SOMEBODY PLEASE FIX IT) days.
  • Total Solids
Total Solids is the measure of the suspended particles in a water sample. This was measured by evaporating a sample of water from each site then weighing the amount of material left behind.
  • Eco Check strips
  • Dissolved Oxygen (DO)
This is the measure of dissolved oxygen in water. The more dissolved oxygen the healthier the water. This was measured using a DO probe.
  • Biochemical Oxygen Demand (BOD)
This is amount of Dissolved Oxygen needed for anaerobic organisms to survive to break down organic material.