Arsenic and Manganese Reduction without Treatment

Well conditions:
This large production well had a flowrate of 2,900 gpm with arsenic concentrations of 12 ppb and manganese concentrations of 40 ppb

Analysis:
A depth specific analysis (which is a combination of spinner and water quality analysis) showed higher arsenic and manganese concentration in the upper zones. This upper zones produced about 30% of the water.

Recommendations:
Closing of upper zones through packer installations

Results:
Arsenic and manganese concentrations were reduced below MCL and secondary MCL. Arsenic was reduced from about 12 to 7.5 ppb and manganese improved slightly. This measure allowed to keep the well in operations without expensive wellhead treatment. restrictions.

Calculated reductions:

Observed: Long term arsenic reduction is 35% to a concentration of about 7.5 ppb