If the text is introducing this more as a vague concept, I would keep the concept vague, too, as the Google results generally do. There are more results for "compost made from sewage sludge" than "construction soil", even if this is the industry term.

Additionally, the naming of this product appears to be of great controversy in any case:

"But you won't find the word "sewage sludge" on the bags of "soil," "soil amendment," "compost" or "fertilizer" that are made from the sludge. Instead, you may find the word "compost" in the ingredients and even the word "organic" or "organics" on the label. Unless the material has the Organic Materials Review Institute (OMRI) certification, however, it is not a certified organic product. Organic produce cannot be grown in sewage sludge under federal law."