Sulfate –9.24 mg/L (OK) – drinking water standard is < 250 mg/L – this does not suggest any specific impact.
Arsenic – 0.0076 mg/L (Total) and 0.0063 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 - 0.164mg/L (Total) and 0.0924 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 – 0.325 mg/L (Total) and 0.321 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.
Fluoranthene (Benzo(j, k)fluorene) was reported at a level of 0.03 ug/L or 0.00003 mg/L and there is a trigger level reported at 0.63 mg/L. It has been suggested that the EPA has set for total PAHs of 0.2 ug/L or 0.0002 mg/L and I can not find an EPA reference that confirms this statement, but
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
Fluorene was reported at 0.010 ug/L or 0.00001 mg/L and the reported EPA trigger level is 0.220 mg/L, but has a DWEL of 1.00 mg/L.
Therefore, the primary recommendation would be to resample and use a method with a lower detection limit.
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