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6 3 5 1 Integrated Air Sampling System 6-13 6 3 5 2 Grab Air Sampling System 6-14 6 3 5 3 Continuous Air Sampling 6-15 6 4 Groundwater Sampling 6-16 6 4 1 General Considerations 6-16 6 4 2 Purging and Sampling Equipment . . . . 6-16 6 4 3 Sample Container Preparation 6-16 6 4 4 Equipment Decontamination 6-16 6 4 4 1 General 6-16 6.4 4 2 Decontamination Procedures 6-17 6 4 4.3 Work Area Procedures 6-18 6.4 4 4 Waste Management 6-20 6 4 5 Water Level and FPLH Layer Thickness Measurements 6-21 6 4 6 Purging. 6-22 6 4 7 Sampling 6-23 6.4 7 1 Sampling Procedures 6-23 6 4 8 Post-sampling Activities 6-25 6 4 9 Temporary Probes 6-25 6 5 Soil Sampling 6-27 6 5 1 Hollow-stem Auger Drilling 6-28 6 5 2 Rotary-wash Drilling 6-30 6 5 3 Test Pit Exploration 6-31 6 5 4 Hear Surface Soil Samples 6-33 6 6 Sample Storage and Transport 6-34 6 6 1 Sample Containers/Preservation and Holding Times 6-34 �} 6 6 2 Sample Transportation 6-35 6 7 Piezometer and Monitoring Well Construction 6-36 6 7 1 General Design Considerations 6-36 6 7 2 Casing Size, Material, and Installation 6-36 6 7 3 Filter Pack Design 6-39 6 7 4 Well Seal Material and Placement 6-41 6 7 5 Locking Protective Casing and Aprons 6-42 6 7 6 Well Identification Tags 6-42 6 7 7 Survey Control fi-43 6 8 Well Development 6-43 6 8 1 Surge Block Method 6-44 6 8 2 Pumping Methods 6-44 6 9 Hydraulic Evaluation 6-45 6 9 1 General Considerations 6-45 6 9 2 Water Level Measurements 6-46 6 9 3 Slug Tests 6-48 6 9 4 Pumping Tests 6-50 6 10 In-Situ Subsurface Exploration and Testing 6-52 6 10 1 Standard Penetration Tests (SPT) 6-52 6 10 2 Cone Penetrometer Testing 6-53 6 10 3 Geophysical Logging 6-54 -iii-