Nurdles are pre-production microplastic pellets about the size of peas. Plastics companies melt them down to make stuff and sometimes they flush them away. Because they are Hydrophobic nasty chemicals like PCBs and DDE latch on to them, which would be cool but unforuntately they look like food and animals eat them and die. (details). I am collecting these ones in Pakuranga Creek to send to Japan for Analysis via www.pelletwatch.org
These Nurdles are likely from a local plastic manufacturing company. I will take some photos and let them know. 
Update: I checked the storm water pipes that the plastics company uses and I found no Nurdles at all! They must be coming from somewhere else. Other storm water pipes in the area seem clean, there is something suspicious about the original outlet, there are too many different kinds of pallet for them to come from one spill.
