dangers related to the move, fearing that contaminants could be pushed into the surrounding water. The Petitcodiac Riverkeeper also noted uranium mining's "irreversible effects to the health of ecosystems, watersheds, wildlife, agriculture, recreation, and public health", and joined 30 other environmental groups in asking the provincial government to establish a ban on the act. The province would later restrict uranium mining to from residential areas and ban it from protected drinking water areas. Another controversy in 2006 involved exploration for oil and gas deposits in the same area, but access was blocked by the municipal government. Shortly after the building of the causeway, a landfill was built near the river. Various materials were disposed of in the area, including petroleum waste oil, pipe and foam insulation, sewage sludge, and medical waste. While the landfill was shut down in 1992, samples by the Environmental Bureau of Investigation and the Petitcodiac Riverkeeper showed that ammonium levels around the leachate exceeded Canadian quality guidelines by as much as 15 times, and contained heavy metals, petroleum hydrocarbons, and PCBs. A mortality rate of 100 percent was found for test trout and daphnia when exposed to water samples. Gemtec Limited, the company responsible for planning and closing the landfill, and the City of Moncton were charged on 12 March 2002, for offences relating to the Canadian Environmental Protection Act (1999) and the Fisheries Act. The city pleaded guilty on 23 September 2003, paid a $35,000 fine, and was ordered to help reduce the leachate flow from the landfill. Three years later, Gemtec Limited was fined a total of $6,000 and was ordered to contribute a total of $22,000 to the federal Environmental Damages Fund and the Jonathan Creek Committee. Discharge The river aids in the drainage of ten significant bodies of water: Weldon Creek, Fox Creek, Mill Creek, Halls Creek, Jonathan Creek, Turtle Creek, Little River, Pollett River, Anagance River, and North River. A report in 2000 showed that it handles an average discharge of at the causeway yearly, with a recorded high of in 1962 and a low of in 1966. The same report estimated mean values for the minimum and maximum discharges for every two-year, 10-year, and 100-year flood events, and minimum discharges for every two-year, five-year, and 100-year "drought" events: Tidal bore The Petitcodiac River tidal bores—retrograde waves moving upstream over downstream waves—occur twice a day and come from the world's highest