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49 <br />. sulfide minerals. Any water that is suspicious should be <br /> sampled for more complete analyses. If the water is flowing <br /> outdoors, then aquatic life will also be a clue. Acid mine <br /> water will usually kill vegetation except for certain algae <br /> in the water. Other water will support grasses and flowers <br /> along the banks. The color of the water can sometimes be <br /> deceptive. Water of a pH of 3 can be almost colorless, <br /> while water of a pH of 5 flowing over red/orange sediment <br /> can appear to be much worse than expected. <br /> To answer the question of aquifer type will take intui- <br /> tion, and a long period of observation. The characteristic <br /> of the two aquifer models is shown in Table IV. Flow is the <br /> primary physical observation,_the consistency of the flow in <br /> a diffuse aquifer is remarkable. On the other hand a conduit <br /> <br /> aquifer will react to changes in precipitation and to the <br /> spring thaw and runoff. A stake in the stream bed is all <br /> that is needed to observe variations in flow of 50% or more. <br />Observations for a week to 10 days after a wet period are <br />most important. The primary chemical test is conductivity <br />and temperature. For a conduit aquifer, large amounts of <br />precipitation or runoff will dilute the ground water and <br />conductivity and temperature will drop. Also, the water may <br />carry more suspended material. For a conduit aquifer, a <br />large amount of precipitation or runoff may change the flow <br />but if it does, the concentration is likely to increase <br />because ground water that has been in contact with rock <br />for long periods of time will be flushed out. The effect <br />0