Compliance sampling is the collection of wastewater, soil, or dust. There are two types of permits we typically deal with:
State Pollution Discharge Elimination System (SPDES)
This permit is used when an industry discharges their water directly into a stream or river. These industries have a stricter permit because the water does get treated by an outside source before it is discharged.
This permit is used when the water an industry discharges will be pre-treated before being discharged into a stream or river. The still have guidelines of what is allowed in their water, they're just not as strict as a SPDES permit. The main difference being a larger allowable limit of pH. Typically 5.0-12.0 instead of 6.0-9.0 for SPDES.