How will potential impacts to ground water by No. 2 fuel oil or diesel be addressed?
The Department has concluded that residual No. 2 fuel oil (and therefore diesel as well) does not appear to be a threat via the impact to ground water exposure pathway except for 2-methylnaphthalene. This position is in large part based on the mobility and toxicity of 2-methylnaphthalene. Using the soil-water partition equation, the impact to ground water guidance criterion for this compound is 5 mg/kg. The results of the Department study involving 14 residential No. 2 fuel oil discharges (described in http://www.nj.gov/dep/srp/guidance/rs/phcguidance.pdf) suggest that levels of regulatory concern for 2-methylnaphthalene as relates to the impact to ground water exposure pathway may be exceeded when the EPH concentration exceeds 1,200 to 1,600 mg/kg. This is below the remedial goal for EPH and is why contaminant specific monitoring for 2-methylnaphthalene (via the BN compound analysis) is recommended at 1,000 mg EPH/kg or greater. In this way the compound-specific risk may be assessed d
