Ahtna Engineering Services, LLC (AES), provided services to mitigate, remediate, and ensure the long-term management of human health risks associated with chlorinated ethene vadose zone soil and groundwater contamination at the Gaffney Road West Site in Fairbanks, Alaska. AES has managed sub-slab depressurization/soil vapor extraction (SSD/SVE) system operations, monitoring, and maintenance (OM&M); SSD system optimization, multiple vapor intrusion (VI) assessments; a private water well inventory, and groundwater monitoring under two consecutive contracts valued at $90K, with amendments bringing the total project to $375K. Highlights of AES’ project work include:

  • AES installed seven deep soil gas vapor monitoring wells along the centerline of a chlorinated ethene groundwater plume in a residential neighborhood to evaluate VI risk. AES designed an innovative sampling program with an analytical laboratory that compared soil gas results obtained by passive samplers to results obtained by more conventional canisters.
  • AES oversaw the conversion of a 7-year-old SSD/SVE system located in a standalone enclosure to a more energy- efficient SSD fan located in the mitigated building. AES is currently performing continuous indoor air sampling to ensure the efficacy of the modified SSD system, with the goal of decommissioning the previous system.
  • Completed all work under budget on an annual basis through strategic utilization of unique work scheduling to maximize daily production and results.

Ahtna Engineering Services, LLC (AES), provided services to mitigate, remediate, and ensure the long-term management of human health risks associated with chlorinated ethene vadose zone soil and groundwater contamination at the Gaffney Road West Site in Fairbanks, Alaska. AES has managed sub-slab depressurization/soil vapor extraction (SSD/SVE) system operations, monitoring, and maintenance (OM&M); SSD system optimization, multiple vapor intrusion (VI) assessments; a private water well inventory, and groundwater monitoring under two consecutive contracts valued at $90K, with amendments bringing the total project to $375K. Highlights of AES’ project work include:

  • AES installed seven deep soil gas vapor monitoring wells along the centerline of a chlorinated ethene groundwater plume in a residential neighborhood to evaluate VI risk. AES designed an innovative sampling program with an analytical laboratory that compared soil gas results obtained by passive samplers to results obtained by more conventional canisters.
  • AES oversaw the conversion of a 7-year-old SSD/SVE system located in a standalone enclosure to a more energy- efficient SSD fan located in the mitigated building. AES is currently performing continuous indoor air sampling to ensure the efficacy of the modified SSD system, with the goal of decommissioning the previous system.
  • Completed all work under budget on an annual basis through strategic utilization of unique work scheduling to maximize daily production and results.

Client

Alaska Dept. of Environmental Conservation

Period of Performance

8/27/13–6/30/18

Value

$375,000

Location

Fairbanks, Alaska

Categories: Environmental