Monitoring Vapor Intrusion Mitigation Effectiveness Sample Clauses

Monitoring Vapor Intrusion Mitigation Effectiveness. For vapor intrusion mitigation by an active SSD system or a continuous PPV system, the effectiveness will be monitored by demonstrating higher air pressure inside the building as compared to outside the building. Demonstrating that pressure differential indicates the vapor intrusion exposure pathway is incomplete, i.e., at any cracks or penetration in the floor, air will flow outward from the building to the subsurface instead of soil vapors flowing inward, as would be required for vapor intrusion to occur. Such monitoring shall be performed quarterly to verify continued effectiveness. For vapor intrusion mitigated using ventilated parking garage construction, effectiveness will be monitored by collecting air samples inside and outside of the parking garage (at times when vehicles are not present in the parking garage). Effectiveness can be demonstrated by showing that COPC concentrations inside the parking garage are either (a) at the same level as outside the parking garage or (b) lower than the U.S. EPA PRG for ambient air. In the event COPC concentrations inside the parking garage exceed both those values, effectiveness could be demonstrated by measuring COPC concentrations in indoor air in the occupied spaces overlying the parking garage. The effectiveness shall be demonstrated once following construction of the parking garage while the ventilation system (if any) is operating, and again whenever there is any substantial modification to the ventilation system. For vapor intrusion mitigation by a system not described in this EIMP but approved by RWQCB, the method of demonstrating effectiveness must also be approved by RWQCB.
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