2.1.1 Narrative
Activities for reporting period beginning March 15, 2016 through April 11, 2016 included the following:
On April 5, 2016, with the permission of the property owners, OSC Chase, a representative from EPA’s Environmental Response Team (ERT) and ERT’s Scientific, Engineering, Response & Analytical Services (SERAS) contractor personnel visited three residences to install new sampling ports for the upcoming sub-slab vapor sampling. One home still had sub-slab ports that were installed during the previous sampling event. The ports were checked and cleaned and were found to be in good condition. EPA oversaw the installation of sub-slab sampling ports at the other two residences by SERAS personnel.
On April 7, 2016, OSC Chase, EPA ERT and SERAS personnel returned to the residences to set up Summa canisters to collect 24-hour samples of sub-slab vapor, indoor air and ambient (outdoor) air. Air monitoring was
conducted to evaluate conditions at the time of the sampling and to identify
any potential indoor sources of volatile organic compounds (VOCs). No elevated levels of VOCs were detected
during the air monitoring of the residences.
On April 8, 2016, EPA ERT and SERAS personnel returned to pick up the Summa canisters. The samples were later prepared for shipment to an approved laboratory for analysis.
Activities for this reporting period (April 12, 2016 through August 2, 2016) included the following:
The samples were analyzed by ALS Laboratory in Simi Valley, CA.
EPA ERT SERAS contractor performed a Quality Assurance / Quality Control review of the laboratory data and prepared a final analytical report for EPA.
EPA reviewed the results of the April 2016 sampling and provided those results to ATSDR.
EPA provided the final validated sampling results to the property owners.
In summary, VOCs were found in the
samples collected from the ambient (outdoor) air, indoor air and sub-slab vapor. In general, the indoor air and sub-slab vapor
results were lower than previously detected. EPA did not
identify VOCs at concentrations in indoor or ambient air that present a health
concern to adult or children occupants of the residences sampled.
2.1.2 Response Actions to Date
2.1.3 Enforcement Activities, Identity of Potentially Responsible Parties (PRPs)
2.1.4 Progress Metrics
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