On 08/08, municipal officers noted aquatic wildlife mortality along 2 km at the confluence of the RIBES stream with the RATIER river. On 10/08, the pollution source was identified: a pharmaceutical industry had discharged sodic water into the RIBES river. The water union alerted the inspection authorities for classified facilities of the discovery of this pollution. On site that same day, the inspection prevented the management of the establishment in question so that it could take the necessary actions to stop this discharge. At 4 pm, the storm water basin was isolated by closing the outlet valve. The administration drew up several reports establishing the facts. A stream of water (pH 11) had escaped from the storm water basin towards the stream, as the geomembrane of the basin had local tears. Water (pH 10) from the East section of the establishment arrived in the basin. At 6.30 pm, an internal investigation highlighted a continuous flow of soda water (pH 11.8) from building V15’s (authorised in 2002) drain network which was connected to the rainwater network. The rainwater network spilled into a 5,100 m³ basin before discharging into the RIBES river while the wastewater network was connected to the Grand Lyon network. The actual drain network recovered the subsoil infiltration water and fed the stream. At 7 pm, the drain network for V15 was isolated by installing an inflatable plug on the outlet of its pipe. At around 8.30 pm, the pH of the water at the inlet of the storm water basin reached 8 (a value consistent with the acidity of the soil in the surrounding area). The inspection authority asked the operator to monitor the pH of the water at the inlet of the storm water basin over the night of 10 to 11/08. The soda water was pumped and the basin was put back in service as a prevision for any weekend rain. A defect on the V15 wastewater network connected this network to the building’s drain network. Manufacturing process qualification tests that were being carried out in this building over the past few days were stopped until the networks were repaired. The emergency response measures order stipulated monitoring, containing, recovering and treating the soda water present in the V15 drain, determining the cause of the network’s contamination, implementing corrective measures, monitoring the water quality in the storm water basin and repairing the storm water basin’s sealing. On 9/09/09, the Court of Appeal of Lyon confirmed the sentencing of the company’s former director for spilling dangerous materials into the natural environment.