Monitoring of Residents Homes – Whether test results are positive or negative, regular monitoring of the homes is required. How often will monitoring take place?
As required by USEPA/NJDEP, DuPont collects a post-mitigation indoor air sample a minimum of 30 days after the system is installed and running. A second post-mitigation indoor air sample is required if the first sample is not collected between November 1st and March 31st. In addition, DuPont shall inspect the vapor intrusion mitigation systems at each building on a quarterly basis for the first year. Assuming that the system does not require re-commissioning, DuPont can reduce the frequency of inspections to annually after the first year. Since DuPont was unable to gain access to a majority of the structures within the PVMA for the purpose of installing the mitigation systems, the USEPA/NJDEP directed DuPont to complete the vapor intrusion investigation of the remaining structures that were not actively moving towards mitigation (see Vapor Intrusion Investigation, Phase II Program at www.nj.gov/dep/srp/community/sites/dupont_pompton_lakes/vi_addendum.pdf. This investigation includes th
