Sulfate – 5.20 mg/L (OK) – drinking water standard is < 250 mg/L – this does not suggest any specific impact.
Arsenic – 0.006 mg/L (Total) and 0.0058 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.
Barium - 0.707mg/L (Total) and 0.716 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 – 0.0538 mg/L (Total) and 0.0522 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. Minnesota is the state with the lowest standard of 0.600 mg/L. Therefore, this does not appear to suggest any form of impact. (OK)
Based on the ratio of methane to ethane, the ratio is 26. Since a ratio of methane to ethane of over 1000 typically suggests a biogenic source and a value of under 100 suggests a thermogenic source, the available information would suggest a thermogenic source for the gas. As a guide, it may be possible to use a ratio to suggest the source of the gas- “ if the ratio of methane to ethane is 25, the source is thermogenic, but if the ratio is over 2500, then it is biogenic" (Mr. Bob Pirkle, President of Microseeps, Inc.), but between 25 and 2500 this is where isotopic analysis is critical.
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.
Lithium - was reported at < 200 ppb or 0.2 mg/L. There are no current federal standards for lithium in drinking water. To protect human health, EPA estimated that a lithium concentration in a potable water supply should not exceed 700 μg/l or 0.7 mg/L.
Methane gas appears to have a thermogenic origin.
Document can not be copied in whole or part without the expressed written permission of Mr. Brian Oram, B.F. Environmental Consultants Inc. http://www.bfenvironmental.com
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