EWMA is a leader in the design and installation of vapor intrusion mitigation systems for commercial and industrial structures. As an initial step, EWMA thoroughly investigates a vapor intrusion condition beneath a structure in compliance with the New Jersey Department of Environmental Protection (NJDEP) Vapor Intrusion Guidance Document (VIG).
Once it is determined that the sub-slab beneath a structure represents a potential source of vapor intrusion from contaminated ground water, EWMA performs field investigation activities to aid in the design and installation of a cost-effective Sub-Slab Depressurization System (SSDS), which is designed to eliminate sub-slab vapor intrusion pathways and reduce volatile organic compounds (VOCs) inside the structure to below regulatory permissible levels. The field activities include a field inspection of the building foundation/slab to identify any potential routes for vapor intrusion and a diagnostic field vacuum test to measure site-specific conditions and determine the effectiveness of a SSDS at the site.
EWMA uses the results of the field inspection and diagnostic field vacuum test to determine the number and locations of depressurization points required, the type of SSDS most appropriate for the structure, and to prepare a SSDS design and operational strategy, which is submitted to the client for their review and approval. In addition, an Air Permit is obtained from the NJDEP Air Quality Permitting Program (AQPP) for the installation and operation of the proposed equipment.
Following the start-up of the SSDS, to ensure that the SSDS is preventing the intrusion of VOCs vapors, and as part of the Air Permit requirements, mandatory indoor air monitoring and air sampling is performed frequently during the initial two (2) years of operation and annually thereafter. EWMA also provides SSDS operation and maintenance (O&M) services on an ongoing basis, as necessary.
See the following case history for more information: