Soil Testing & Contamination Cleanup in Salem, OR

Soil testing is how you find out whether a heating oil tank leaked, and it is the part of any decommissioning that decides what the job costs. DEQ’s method is specific: samples from the native soil below each end of the tank, plus one from the worst-looking soil if any is found, analyzed by an accredited lab for diesel and lube-oil range hydrocarbons by NWTPH-Dx. If groundwater seeps into the excavation, a groundwater sample is required too, tested for BTEX and PAHs. DEQ rejects results that were not collected, delivered and analyzed within 14 days, and it will not use site data more than 90 days old to certify a closure.

A result under 50 ppm lets a tank close as a clean decommissioning. At or above 50 ppm, the release is confirmed and has to be reported to DEQ within 72 hours under OAR 340-177-0055, and the job becomes a cleanup. That number is a reporting trigger, not the cleanup target. The target depends on the route the site qualifies for.

There are three routes. The soil matrix sets a cleanup level of 100, 500 or 1,000 ppm depending on depth to groundwater, rainfall, soil type, how the local aquifer is used and what is nearby, and it usually means digging out the contaminated soil. The generic remedy lets contamination up to 10,000 ppm stay in place under at least three feet of clean cover, provided no groundwater is affected and no more than 65 cubic yards above 500 ppm remain. A risk-based closure relies on more lab work and controls instead of digging. DEQ describes all three in its cleanup guidance for homeowners, and the route is the biggest single driver of cost.

Whichever route applies, the cleanup ends with a certified report that DEQ registers, followed by a letter closing the file. That letter is what restores a property’s standing with buyers and lenders. If oil is actively leaking now, start with emergency leak cleanup rather than a sampling appointment.