One Site, Two Liquids
Procurement documents usually list landfill leachate as a single substance. Operationally it is at least two, and they pull protective selection in opposite directions. Waste in its first year or two passes through an acidic phase: pH commonly sits between 5 and 6.5, volatile fatty acids and solvents dominate, and the liquid is aggressive to metals but relatively kind to nitrile. Once a cell turns methanogenic, the same site produces a liquid at pH 7.5 to 8.6 with ammonia nitrogen in the low thousands of milligrams per litre, plus sulphide. Nitrile is the wrong default there, because strong alkali and ammonia swell and degrade it.
The practical consequence is that a glove which performs well at one monitoring well can fail at another a few hundred metres away. Colour-code by cell phase, not by site, and write the phase into the well log so the store room can issue the right box without a phone call.
Heat You Cannot See From the Gate
A closed site is not an inactive one. In late October 2026 a state attorney general's office filed action over a subsurface smouldering reaction that had spread from roughly 20 acres to about 90, with waste temperatures reported near 127 degrees Celsius, tens of thousands of odour complaints and a site that had stopped taking waste in January 2025. Earlier in the month, a deputy environment minister inspecting a coastal landfill on Bali ordered a leachate plant completed after liquid was again found escaping toward mangroves.
For crews drilling gas wells or excavating hot cells, chemical and contact heat arrive together. Standard permeation figures are generated at room temperature; a glove that holds a solvent at 23 degrees is not evidence of anything at 70. Ask for the test temperature in writing, and treat heat resistance as a separate line item rather than a footnote to chemical resistance.
Gas is the other half. Carbon monoxide, hydrogen sulphide, benzene and chlorinated volatiles migrate through soil and into trenches and site buildings. No glove stops a gas; detection sets the boundary, and entry work belongs to breathing apparatus. Gloves and boots cover the manual tasks that remain.
Needles in the Mud
Leachate sumps and tipping floors deliver the mechanical hazards that chemical data sheets ignore: needles, broken glass, wire and sheet metal, all in wet mud. A puncture-resistant midsole to a recognised footwear standard is the minimum, together with a moulded, seamless upper, no laces and a sole pattern deep enough for a wet slope yet open enough to be brushed clean. Provide a boot jack at the decontamination point so boots come off without hands, and a drying rack, because a boot stored wet is tomorrow's problem.
Buy the Instrument With the Glove
Monitoring hardware belongs in the same purchase order as the protective kit. In late October 2026 a regional pollution board told a tribunal that a large dumpsite still lacked methane detectors and groundwater piezometers, that leachate was stagnating and partly routed to a sewer, and that spot fires were burning along the access road.
Kit by role rather than by site: well-head work, excavation, sump cleaning, weighbridge and gatehouse. Add personal hydrogen sulphide and carbon monoxide monitors with calibration gas, spare sensors, and a stated shelf life on every glove box. Then confirm the full size range, including women's sizes, and a decontamination route that ends in something dry.