"If you have ever tried to follow the draft rule table with permitted quantities by class, it's very difficult to use, both for farmers and council staff," he added.
Hazardous substance products often fell into several classes, and multiple quantities could apply to a single product. For example, diesel had multiple classifications as a flammable liquid, a skin irritant, a carcinogen and an aquatic ecotoxin.
Each of those classifications had a different allowable quantity, ranging from 20 tonnes down to six tonnes, leaving everyone unclear regarding what quantity was permitted or how many litres that would translate to.
The HSNO allowed any quantity of diesel on farms, as long as the correct signs were displayed when storing more than 1000 litres or 10,000 litres.
Meanwhile the Resource Management Act had recently been amended to delete district council functions over hazardous substances, a move that Federated Farmers had been advocating for a long time.