Cleanup of Heating Oil Tank – Forest Grove, OR
Alpha performed soil removal, risk assessment, and groundwater study for a leaking underground heating oil tank. Levels of contamination were considered free product, and approximately 80 tons of free product level soil was removed in order to achieve site closure. Alpha worked under the supervision of another environmental consulting firm who was hired by the owner’s insurance agency to oversee our work. Alpha was able to complete site closure, from start to finish, in less than two weeks while keeping the environmental consulting firm, the...
read moreCleanup of Heating Oil Tank – SW Portland
Alpha completed site cleanup to address soil and groundwater contamination from a leaking underground storage tank. Based on the contaminant levels, soil removal was required before the site could be closed with a risk-based study including vapor intrusion analysis with a soil-gas sample. In spite of the removal of almost 25 tons of contamination and a sewer line running over the top of the excavation, Alpha was able to restore the site to conditions which became almost undetectable by the time the house sold less than 3 months later.
read moreDecommissioning of Heating Oil Tank in R-O-W – NE Portland
Alpha decommissioned an underground heating oil tank by removal which was located in the City Right of Way. Based on the depth of the tank being less than 5 feet below surface grade, the City of Portland required that the tank be removed. A series of three gas lines ran above the tank, but Alpha was able to safely decommission the tank by removal without any impact to the lines. All work was completed according to City and Fire Marshal requirements with a City approved Traffic Control Plan which required the on-site presence of a flagging...
read moreCleanup of Heating Oil Tank – SW Portland
Alpha performed assessment for a leaking underground heating oil tank which had impacted groundwater. Alpha removed approximately 20 tons of soil, pumped out and disposed of over 4,000 gallons of water, performed a groundwater delineation consisting of downgradient, crossgradient, and upgradient groundwater sampling, a beneficial water use study and risk assessment. Alpha backfilled the excavation and compacted the soil under the oversight and approval of a geotechnical firm to insure that potential soil settling would be minimal.
read moreCleanup of Heating Oil Tank – Salem, OR
Alpha performed soil removal and risk assessment for a leaking underground storage tank. All work was done for an out-of-state buyer of the property under the oversight of himself, his environmental lawyers, and with the approval of the sellers. Alpha was able to complete all site work, including the installation of a new above-ground tank, and close the file with the DEQ in less than a month.
read moreCleanup of Heating Oil Tank – NE Portland
Alpha performed soil removal and a risk assessment for a leaking underground storage tank. The tank was located beneath the building and the footers of the foundation. Using structural engineering controls, Alpha was able to remove the majority of the contamination, and successfully completed the cleanup without having to impact the interior of the building. Backfilling of the excavation also included oversight and approval by a geotechnical firm to minimize future structural issues.
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