You use the membrane filter procedure to determine coliform bacteria count for
the lake described in exercise 46. The count is 750 coliform bacteria per 100 ml of
the sample. What would you suggest be done?
a. Declare the water absolutely safe for swimming since the count is extremely
b. Declare the water undesirable and recommend additional and thorough
surveys to prove the contamination harmless.
Prohibit swimming because the water is dangerously contaminated.
48. Accidents are a significant danger at natural swimming areas. Because of this, it
is recommended that every 1,000 feet of beach have:
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