Sample Collection

DEQ evaluates data submitted by external parties to determine that the data are of sufficient quantity, type, and quality before they are used to make decisions. DEQ’s evaluations are conducted using the following quality assurance project plans and standard operating procedures (deviations due to site-specific circumstances may occur).

Always empty (read below)

This accordion will not appear on the screen

UST Closures, Petroleum Site Assessments, and Corrective Action

Fact sheet

How DEQ Evaluates Site Assessment and Corrective Action Data

DEQ standard operating procedures

Data Review, Verification, and Validation of External Party Petroleum Data Quality Assurance Project Plan and Standard Operating Procedure (January 2023)

Used Oil UST Closures and Release Sampling

Fact sheet

How DEQ Evaluates Sample Collection and Data Analysis for Used Oil UST Closures and Releases

DEQ standard operating procedure

Used Oil UST Closure and Release Sampling Standard Operating Procedures (May 2017)

Petroleum-Contaminated Soil

Resources