Toxic waste monitoring and collection device

A device for monitoring and collecting toxic wastes in underground reservoirs, with no moving parts, is disclosed herein. A pollutant/water separator is supported interior to an outer chamber for protection which is ventilated for communication therethrough. The lower portion of such chamber forms a collection chamber for collected toxins to which still more chambers may be added in modular fashion for greater storage capacity and increased intervals between servicing. The ventilation array is preferably arranged so as to not to permit communication until the assembled device is weighted, and to retain a buoyancy chamber above such array so as to further support such device and to exclude water from the top of the separator without any mechanical seals. By elimination of hydrocarbon-based adhesives, proper selection of materials, and the use of triply-sealing mechanical connections, all chances for the monitoring device to contaminate pure wells and to cause false positive indications are eliminated.