Department of Health Seal

TGM for the Implementation of the Hawai'i State Contingency Plan
Section 7.15
DOCUMENTATION OF SOIL VAPOR OR INDOOR AIR SAMPLING

7.15 DOCUMENTATION OF SOIL VAPOR OR INDOOR AIR SAMPLING

A soil vapor or indoor air investigation report should be submitted to the HEER Office for review following each sampling event. The investigation report is often prepared as a standalone document, although it can be included as an appendix in a larger investigation report. Information on recommended format and content requirements for Investigation Reports is included in Section 18. The submittal of a workplan for soil vapor and/or indoor air investigations is also strongly encouraged.

The soil vapor or indoor air investigation report should include a thorough description of all field operations, deviations from the approved work plan, data results (including data inconsistencies or laboratory analytical flags) and an analysis and interpretation of the data. All soil vapor or indoor air investigation reports should include a site plan map identifying soil vapor or indoor air sampling locations. The relative location of soil and groundwater contamination with respect to locations of sampling probes and all current or proposed future buildings should also be depicted on the figures. Field activities during vapor point installation and sample collection should be fully documented in the final investigation report. For sites where soil vapor or indoor air samples are collected from permanent probes, the probe construction details should be included in the investigation report. All field data including flow rates and pressure readings (from a vacuum gauge) during sample collection should also be included in the investigation report. Additional information that should be presented for the collection and interpretation of LVP sample data is summarized in Section 7.8.4.

The soil vapor or indoor air analytical data should be summarized and presented on a table that facilitates a review of the spatial and temporal trends as well as the relationships between lateral and vertical sampling locations.