VaDEQ, Site Assessment Branch referred subject site on 10/18/10 to sub area FOSC for initiation of a Removal Site Evaluation and more specifically to determine if vapor intrusion of documented PCE, TCE and petroleum hydrocarbons has occured. Residence downgradient of a dry cleaner apparently detected odors in drinking water and notified DEQ. DEQ thru its state lead contractor initiated assessment activities during the summer of 2010 and confirmed elevated levels at the tap and in groundwater. Residents were provided carbon filtration systems to treat tap water however vapor intrusion assessment was not performed.
On November 3, 2010 the FOSC and Start personnel initiated indoor air sampling within three potentially impacted residential locations. Summas were placed both in the basement, bedrooms and living room areas on two separate levels of each home. The cannisters were retrieved on November 4 and shipped to lab. Turnaround of the validated data is expected in 4 to 6 weeks. Results indicate low levels (PCE) at two of the three residents and the third residence above detection limits, however interferences at this residence may be possible due to heavy interior and exterior remodelling.
On January 25 and 26, 2011 the FOSC returned to the site to perform both indoor air/ambient air sampling as well as sub-slab sampling in attempt to be able to rule out interferences. Results were returned during the week of Feb 14 and showed that sub slab soil gas levels were extremely low thereby indicating the lack of a sub surface source of PCE. Results were forwarded to Va DEQ. Presently there are no plans for followup sampling activities.
