2.1 Overview of PVMS
This section should include a design basis that explains how vapors are entering, or may enter, the structure and how the PVMS prevents soil vapor from entering the building. It should include an overview of the type and function of the proposed mitigation system (e.g., vapor barrier, epoxy coating, passive sub-slab venting system, etc.).
2.2 Passive vapor barrier selection
This section should briefly discuss why the vapor barrier or epoxy coating material(s) installed was selected and how it was determined to be appropriate for the intended application based on the results of chemical and physical testing data available for those material(s). Briefly discuss any diffusion coefficients established for those materials, which hazardous substances they address, and whether they are capable of preventing unacceptable soil gas concentrations from the vapor source(s) identified from entering the building(s).
Key supporting information
- Figure(s) – cross-section that shows the vapor barrier or epoxy coating and the sampling locations.
- Appendix – manufacturer’s product documentation that identifies established diffusion coefficients for the vapor barrier or epoxy coating material(s) used as part of the PVMS design.
2.3 As-builts of the PVMS and installation documentation
This section should include details and as-builds of the installed components that make up the PVMS. It should include a description of the system and the specific components and elements described in Sections 2.3.1 through Section 2.3.12 below. Figures identified below may be combined when appropriate.
2.3.1 Liner
This section should include a general description liner and a figure that depicts the PVMS.
Key supporting information
- Figure(s) – cross-section(s) that show the liner portion of the PVMS.
- If a PVMS is to be installed in only a portion of the structure, an area map depicting its location.
- Photographs of the liner being installed.
2.3.2 Terminations and penetrations
This section should include a depiction of how the liner was terminated against vertical surfaces and how the vertical features such as pipes or other penetrations were completed.
Key supporting information
- Figure(s) – cross-section(s) or callouts that depict the termination of the liner against vertical surfaces.
- Figure(s) – cross-section(s) or callouts that depict how piping or other penetrations will be completed.
- Figure(s) – depicting the location of every termination or penetration.
- Photographs of the termination and penetrations.
2.3.3 Liner overlap, joining, and seaming (if necessary)
If the liner, as provided from the manufacturer, needed to be joined or seamed to allow for coverage of the entire floor space, this section should include a description of how that occurred, how it was verified to be successful, and how it is documented to be completed appropriately.
Key supporting information
- Figure(s) – cross-section(s) or callouts that how two liners are joined or seamed.
- Photographs documenting the seaming or joining process.
2.3.4 Permeable sub-slab layer
A venting system should be incorporated into the overall design of a PVMS. This section should provide a brief description of the materials used to create, maintain, or document the permeable sub-slab layer.
Key supporting information
- Figure(s) – cross-section(s) depicting the type of material(s) of the permeable sub-slab layer, the thickness of the layer, and any vapor collection piping installed within the permeable sub-slab layer.
2.3.5 Horizontal conveyance piping (if installed)
This section should include a general description of the horizontal conveyance piping used to direct the vapors through the structure or beneath the liner in subsurface.
Key supporting information
- Figure – depicting the horizontal conveyance piping layout of the PVMS.
2.3.6 Vertical vent risers
This section should include a general description of the vertical conveyance piping used to direct the vapors through the building and above the roof.
Key supporting information
- Figure(s) – cross-section of structure that details the vertical piping runs.
2.3.7 Exhaust vents
This section should include a general description of the PVMS exhaust point location(s). This section should identify any distance(s) that were achieved between each exhaust point location and building features including height above structure or roof, other air intake(s), window(s), structure access point(s) such as a door or patio, and HVAC components based on AARST SGM-SF-2017 (with 12/20 revisions).
Note: All distances should be measured between the closest point of the exhaust opening and the closest point of all location requirements specified.
Key supporting information
- Figure(s) – plan view that depicts the roofing locations and any other vents or air intakes that influences the location of the exhaust.
- Figure(s) – cross-section of structure that details the exhaust vents height above the structure.
- Photographs of the completed vents.
2.3.8 Materials and other specifications
2.3.8.1 Component labeling
This section should reaffirm that, when and where labeling was warranted, labeling practices followed standards such as AARST SGM-SF-2017.
Key supporting information
- List of required labels as per SGM-SF 2017.
- Figure(s) – depicting final labels and language.
- Figure(s) – identifying the physical location of each label.
2.3.8.2 Other specifications (if necessary)
Additional information can be provided in this section if the design firm believes that the information is critical to the success of the installation of the PVMS design and has not been included elsewhere in this document.
Key supporting information
- Figures, tables, or appendix may be provided, as appropriate.
2.3.9 Preferential pathways and other unique features (if necessary)
This section should describe the mitigation strategy for any preferential pathways identified in Section 1.7 that required mitigation.
Key supporting information
- Figure(s) that detail each unique mitigation approach implemented for preferential pathways.
2.3.10 Elevators and below grade pits or tunnels (if necessary)
This section describes the mitigation strategy and how it is effective for each elevator shaft, pit, sump, or tunnel that are part of the structure.
Key supporting information
- Figure(s) – detailing each unique mitigation strategy implemented for any elevator shafts, pits, or tunnels.
2.3.11 Vertical/sidewalls below grade (if necessary)
This section describes the mitigation strategy implemented for any vertical sidewall below grade where mitigation is necessary.
Key supporting information
- Figure(s) – detailing the mitigation strategy for the vertical wall(s) below grade.
- Appendix – providing additional supporting information, if necessary.
2.3.12 Groundwater in contact (if necessary)
If groundwater is in contact or may come into contact with the structure (see Section 1.4), this section describes how the shallow groundwater was addressed to allow for the proper function of the PVMS.
Key supporting information
- Figure(s) – detailing the mitigation strategy implemented for shallow groundwater.
- Appendix – providing additional supporting information, if necessary.
2.3.13 Installation documentation
This section provides an overview of the installation documentation that was collected, identifies any deficiencies, and reports any repairs that were completed during the installation process.
Key supporting information
- Appendix – Provides the supporting oversight and installation documentation.
Appendix 1 of Addendum A provides a summary of the documentation that should be included.
2.4 Alarm and performance indicator (if installed)
This section describes any monitoring system(s) installed as part of the PVMS and describes the function of the alarm or performance indicator, what it measures, and how it relates to the system function. The section should be specific about any warnings that are relayed, if and how data is stored, how any alarms that are identified are documented, and what documentation (if any) is produced.
Key supporting information
- Figure(s) – detailing the location of alarms.
- Table – identifying any alarms that have been triggered to date and the completed response(s).
2.5 Building codes and permits
This section clearly states that other permits necessary for the installation of the PVMS that are not regulated by RRD have been obtained and compliance is being or has been achieved (e.g., building codes) through an affirmative statement similar to: “The system was installed and is operating in accordance with all local, state, and federal laws and rules.”
Key supporting information
- Appendix – providing any EGLE granted permits or documentation in lieu of a permit that is required.
2.6 Monitoring points and test ports
This section describes the locations that facilitate confirmation of system operation.
Key supporting information
- Figure(s) – plan view depicting the location of each monitoring point in relation to any subsurface PVMS component.
- Table – providing detail on how each monitoring or test point was installed.
2.7 Performance objectives
2.7.1 System performance metrics
This section should identify and establish the performance metrics that are met at each monitoring point identified in Section 2.6, above. It also describes how each performance metric is measured. This section should also present why the performance metrics are appropriate to evaluate the efficacy of the PVMS.
Key supporting information
- Table – if more than one performance metric is required or selected, identify the location and the specific performance metric(s) that are being measured and/or achieved.
- Figure – identifying the location that the performance metric is being evaluated.
Note: Because PMVS do not contain mechanical parts nor are they expected to have consistent or flow through the system, performance factors are typically limited, unless the liner or coating has been breached to the following:
- Confirming flow or connectivity from all portions of the floor to the vertical vent risers and confirming the prevention of advective and diffusive flow into the structure,
- Confirming flow up through the vertical vent risers,
- Confirming the operation of any meter or alarms, and
- Ensuring that the building has undergone any settlement or modifications that may have impacted the integrity of the PVMS.
2.8 System commissioning documentation
This section provides the analysis and supporting documentation that the system was installed as proposed and is functioning as designed.
It should include a summary of the on-site oversight, problems encountered, corrections made, daily field logs, photographic documentation, an analysis of the estimated supplies vs the actual, and any verification samples that were collected.
Key supporting information
- Table – identifying the performance metric(s), the locations monitored and the associated readings.
- Appendix – all field and other supporting documentation