Measured Levels of Hydrogen Sulfide 2

The graph depicts hydrogen sulfide (H₂S) levels measured on the dewatering site on Amber Drive on September 8, 2007 starting at approximately 6PM.

(click on image to enlarge)

This site has been dewatering for approximately 8 days before these measurements were taken. The volume of fetid water being dumped into the swale was nearly a trickle. Contrast these measurements with those taken on Woodbine (see post below) where the dewatering is relatively new and the force of the water was quite substantial.

The measuring equipment was positioned in ranged from within one foot to four feet from the source.

Correlating the measurements to the position of the H2S detector, the force of the dewatering and the wind speed, suggests that the stronger the force of the water, the greater the concentration of H₂S. Additionally, the stronger the wind, the faster the rate of dispersion over a smaller area, and conversely, no to near no wind allows for the gas to concentrate in an ever growing area and move slowly with little dissipation.

(click on image to enlarge)