Sulfate – 8.9 mg/L (OK) – drinking water standard is < 250 mg/L – this does not suggest any specific impact.
Arsenic – 0.004 mg/L (Total) and 0.0026 mg/L (D) – drinking water standard is < 0.010 mg/L – this does not suggest any specific impact and arsenic is a common problem in NEPA – about 6 % of private wells have arsenic above 0.010 mg/L. It would be advisable to monitor the arsenic level of the well on an annual basis. (OK)
Barium - 0.275mg/L (Total) and 0.263 mg/L (D) – drinking water standard is < 2 mg/L – this does not suggest any specific impact and barium is typically detectable in non-saline impacted water at a level of less than 1 mg/L. (OK)
Boron – 0.050 mg/L (Total) and 0.0588 mg/L (D) – no specific drinking water standard drinking water standard is available. EPA appears to have a long-term health advisory of 2.0 mg/L, but other states have limits that range from 0.6 to 1 mg/L. Therefore, this does not appear to suggest any form of impact. (OK)
No specific health concern, but a health risk associated with the potential for a flammable environment.
Action needed to properly vent gas from the well, perhaps modifying the well, water treatment to reduce methane level in the water to < 7 mg/L or more, and isotopic analysis recommended.
Retesting is Recommend -During retesting, it is critical to check for airborne sources of contamination during sampling and it would be advisable to attempt to use a method with a lower detection limit. At this point, I am not sure if a certified method can detect acenaphthylene to the recommended level of 0.000003 mg/L – still researching.
Retesting Recommended - During retesting, it is critical to check for airborne sources of contamination during sampling. The EPA reports a trigger value of 1.3 mg/L, but I can not this reference. I did find a reference to a DWEL of 2.0 mg/L. It appears that the health-based screening requirement in
n-butyl benzyl phthalate (BBP) or benzyl butyl phthalate, is a phthalate, an ester of phthalic acid, benzyl alcohol and n-butanol.” The health based screening level appears to be 0.100 mg/L and the EPA Human Health Equivalent is 1.4 mg/L. Butyl benzylphthalate is an industrial solvent and additive used in adhesives, vinyl flooring, sealants, car-care products and some personal care products. (OK)
Source: USEPA/Office of Water; Federal-State Toxicology and Risk Analysis Committee (FSTRAC).
Lucas SV; GC/MS Analysis of Organics in Drinking Water Concentrates and Advanced Waste Treatment Concentrates: Vol 1. EPA-600/1-84-020a p. 45,147 (1984)
Note: “Polycyclic aromatic hydrocarbons are a group of chemicals that occur naturally in coal, crude oil, and gasoline. PAHs are also present in products made from fossil fuels, such as coal-tar pitch, creosote, and asphalt. Fluoranthene adsorbs strongly to soil and would be expected to remain in the upper layers of soil. However, it has been detected in groundwater samples which demonstrates that it can be transported there by some process(es). It slowly degrades in soil (half-life ca 5 mo to 2 yr).” Based on the reported trigger level and the standard used for
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