4) Weigh and photograph each category
On a worksheet, record the location and size of each container, dumpster or compactor from which you are sorting. Example: 55 gallon gray Brut, 8 yard front load container, 34 yard compactor.
Photograph each category separately. If an item has more than one collection container, photograph all the containers together with that particular item. If possible, get a group shot of all sorted items in their respective containers.
Visually inspect the group to determine the percent total of each item in the waste stream. Record this on the sheet as well. This percentage may end up different from percent by weight. For example, blocks Styrofoam takes up a lot of room but weigh very little. Therefore, a large amount of Styrofoam in the waste stream may greatly impact the volume but not the weight.
Once each category is sorted into a tub or container, weigh each one and remember to subtract out the tare weight to get the true weight of the item. Some items may take up multiple containers so be sure to add all weights together of a particular item. Use the worksheet to record the findings of your waste sort by filling in the columns with the weight of each material.
When the sort is complete:
- Calculate the total weight of material found within each waste receptacle.
- Calculate and record the total weight of each material found in all waste receptacles.
- Based on the total amount of waste sorted, calculate the percentage of each type of material found in all of the waste receptacles.
- Visually inspect the sorted items and determine percent by volume of the total waste stream for each item.