Background Samples. Background samples should be analyzed for the composite set of parameters for each matrix; treat sediments, surface soils and subsurface soils as separate matrices. Background samples are collected, numbered, package, and sealed in the same manner as other samples. For long term and/or especially large projects, it is recommended that 10% of samples collected be from background locations.
Appears in 2 contracts
Sources: Corrective Action Consent Agreement, Corrective Action Consent Agreement