The DNR ordered the city to notify all nearby homeowners and businesses and to give them with methane monitors to alert homeowners if methane enters the home.In other words, if you're strolling down Hall Street this afteroon be careful where you drop a match.
The DNR found potentially high levels of methane October 6, and immediately ordered the city to begin a notification plan for nearby residents and businesses. Further tests were performed, and DNR got confirmation of high methane levels on Oct. 14.
The landfill has three methane testing wells, and the City of St. Louis conducted sampling on Oct. 12. The southernmost well showed 4.3 percent methane by volume; the second and third wells to the north had readings of 11.3 and 46 percent methane by volume.
Methane is a byproduct of the decomposition of waste and is explosive at concentrations between 5 and 15 percent. The regulatory limit for methane at a landfill property boundary is 2.5 percent by volume.
The DNR is requiring the city to develop a plan to determine the extent of the spread and a clean-up plan. The city is also required to continue monitoring the wells and report the readings to the department on a weekly basis