General Sampling ProceduresDecontaminationInstrument Calibration and MaintenancePrior to Drilling ActivitiesSoil SamplingSurface SamplesLithologic DescriptionSoil Texture and Grain SizeLithologic InterpretationSoil Sample ShipmentSampling Preparation MethodsDrilling‐derived Waste DisposalSample Preparation, Packaging, and HandlingSoil Vapor SamplingActive Soil Gas Sampling (EPA Method TO‐15)Soil Vapor Sample ContainersSoil Vapor Quality Control and DecontaminationPassive Soil Gas Sampling (EPA Method TO‐17 and TO‐15)Soil Vapor Sample Log (Chains of Custody)Groundwater SamplingWater Sampling from Monitoring WellsQuality ControlWater Sample PreservationSample LabelingField Quality Control SamplesTravel BlanksField BlanksField DuplicatesMatrix SpikeSample Handling, Storage, and TransportationDocumentationReferencesSuggested Reading