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Cleanup in Vulnerable Communities'Initiative Final Project Reference:Bobson Cleaners Discovery and Enforcement Discovery Project Number:60688620-5.1 Investigation Work Plan 3.2.6 Sample Analysis..................................................................................................................................17 3.2.6.1 Analyses of Soil Gas Samples.........................................................................................................18 3.2.6.2 Analyses of Water Samples.............................................................................................................18 3.2.6.3 Analyses of Indoor Air Samples.......................................................................................................18 3.2.6.4 Laboratory Quality Control Samples................................................................................................18 3.2.7 Sample Containers and Preservatives................................................................................................18 3.2.8 Sample Packaging and Shipment.......................................................................................................19 3.2.9 Sample Documentation.......................................................................................................................20 3.2.9.1 Field Forms......................................................................................................................................20 3.2.9.2 Chain-of-Custody Records..............................................................................................................21 3.2.9.3 Photographs....................................................................................................................................21 3.2.10 Decontamination Procedures..............................................................................................................21 3.2.11 Investigative Derived Waste Management..........................................................................................21 4. Quality Assurance Project Plan.........................................................................................................................23 4.1 Data Quality Objective Process..............................................................................................................23 4.2 Specific Data Quality Objectives ............................................................................................................24 4.2.1 Precision.............................................................................................................................................24 4.2.2 Accuracy.............................................................................................................................................24 4.2.3 Representativeness............................................................................................................................25 4.2.4 Completeness.....................................................................................................................................25 4.2.5 Comparability......................................................................................................................................25 4.2.6 Method Detection Limits......................................................................................................................25 4.3 Data Collection and Evaluation ..............................................................................................................26 4.4 Data Management..................................................................................................................................26 4.5 Assessment Oversight............................................................................................................................27 5. Field Variances.................................................................................................................................................28 6. Health and Safety Plan.....................................................................................................................................29 7. Screening Risk Evaluations..............................................................................................................................30 7.1 Human Health Screening Risk Evaluation..............................................................................................30 8. Discovery Investigation Report Preparation......................................................................................................31 9. Proposed Schedule...........................................................................................................................................32 10. References .......................................................................................................................................................33 Figures Figure 1 Site Location Map Figure 2 Site Plan Map Figure 3 Land Use Map Figure 4A Proposed Sampling Locations Figure 4B Proposed Indoor Sampling Locations Figure 5 Preliminary Conceptual Site Model Figure 6A Sampling Location Results Map Template Figure 6B Indoor Sampling Location Results Map Template Prepared for: Department of Toxic Substances Control AECOM