Add punctuation: The horizontal extent of the pollution plume changes during a yearly cycle but is considered to be in the order of 3040 meters downgradient from the source area
A: The horizontal extent of the pollution plume changes during a yearly cycle, but is considered to be in the order of 30-40 meters downgradient from the source area.

Add punctuation: 7 Let mine enemy be as the wicked and he that riseth up against me as the unrighteous
A: 7 Let mine enemy be as the wicked, and he that riseth up against me as the unrighteous.

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