Sludge Disposal Pathways:

The ZDHC Sludge Reference Document and WWG 2,0 lists the following 7 pathways:

Pathway A - Offsite Incineration at >1000 °C, not owned or operated by the Supplier
Pathway B - Landfill with Significant Control Measures, that control the leachate and gas produced from the stored sludge in the landfill
Pathway C - Building Products Processed at >1000 °C, that includes manufacturing concrete, concrete aggregates, ceramics, brick, mortar, stucco, grout, and more. 

Pathway D - Landfill with Limited Control Measures, where permeability, leachate and gas control are less restrictive than in Pathway B
Pathway E - Offsite Incineration and Building Products Processed at <1000 °C 

Pathway F - Landfills with No Control Measures (these are mainly dump piles and holes with no lining or packing to limit waste exposure to the ground and/or groundwater)

Pathway G - Land Applications such as pastures, forests, reclamation sites, agricultural land, and public parks, street median strips, golf courses, lawns, and home gardens. (The sludge must be of quality determined to benefit the area soil and harmless to public health and the environment for such a disposal pathway)

ZDHC does not intend the Lab Sampler to assess or confirm the major disposal pathway adopted by the Supplier. Instead, the facility must declare their major sludge disposal pathway in the Supplier Profile in their ZDHC Gateway account. The ZDHC Lab Sampler only needs to confirm (prior to traveling to the facility for sample collection) that the facility has made this declaration, and then notes what the Pathway is (from A to G) for purposes of interpretation of the sample results by the lab