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ADVISORY - ACTIVE SOIL GAS INVESTIGATIONS Data gaps identified based on the revised CSM; and Conclusions and recommendations. Additionally, the following tables and diagrams should be included in the Report: Site plan and sample location maps; Plume maps and geologic cross sections with isoconcentration contours displaying the limits of contamination. Data from previous investigations may be included provided the data are presented in a way that distinguishes them from the current investigation; Boring logs; Construction diagrams for soil gas wells; Summary tables for analytical data; Legible copies of field and laboratory notes or logs; All analytical results and QA/QC information including tables and explanation of procedures, results, corrective actions and effect on the data; All raw data including chromatograms and calibration data if specifically requested by the regulating agency; and Electronic data deliverables submitted in the format specified by the regulating agency. All engineering or geologic work should be performed or supervised by a California Registered Professional in accordance with the Business and Professions Code, chapters 7 and 12.5, and the California Code of Regulations, title 16, chapters 5 and 29. 3.0 SOIL GAS INVESTIGATION DESIGN The number, location and depth of soil gas samples should be based on the CSM and the project-specific DQ0s, as well as the following general guidelines. 3.1 LOCATION, SPACING AND DEPTH Subsurface contamination should be delineated three-dimensionally. Vertical soil gas delineation is achieved by collecting soil gas samples at varying depths in a single location, or by using closely spaced soil gas wells installed at varying depths. 3.1.1 Lithology Locations and depths for soil gas monitoring wells should be based on site-specific lithologic information. If on-site lithologic information is not available prior to conducting July 2015 7