Thomas Well Rehabilitation with the Well-Klean Program from HCT LLC

Thomas Well 1 was one of 5 wells targeted for rehabilitation January 2017 utilizing the HCT Well-Klean© Program.

Each rehabilitation project was highly successful with the exception of Thomas Well #1 where a clean Bac T couldn't be obtained.

Thomas Well #1 was constructed in 1956, 61 years prior to this rehabilitation date. The casing is 16 inches diameter, low carbon steel alloy, with louvered perforations from 600 to 1,224 ft. below ground level.

Tool used for brushing and plunging

Tool used for brushing and plunging

The program prescribed for the rehabilitation included pre-cleaning (brush and bail with a biocide), bio-remediate (deep cleaning with biocide), descaling, zonal pump and lift with soda water, disinfect and volumetric flushing for NSF 60 requirements.

Because of the age of the well, a CITM scan was performed. The scan showed the most amount of corrosion on the casing occurred at the static water level. This would make sense as it is the vapor phase of water which is the most corrosive. However, though the scan indicated the area of corrosion in the color red, the amount of casing loss appeared to be less than 15%, thereby not of concern to aggressive cleaning by both chemical and physical means.

Plunger disc(s) - two on top and two on bottom.

The amount of product used;

WaterSOLV™ BC - Brush & Bail with Biocide

12,000 ppm - 1% active peroxide

WaterSOLV™ BC - Bio-remediate

100,000 ppm - 2.81 active peroxide

Well-Klean© Pre-blend - Descale

30% - 9.45% active descaler

Sodium Bicarbonate - Neutralize & Passivate

1,393 lbs

Sodium Hypochlorite 12.5% - Disinfect

200 ppm

Flush - NSF 60 Standard

277,335 gallons

Unable to pass a Bac T, the well was flushed continually and consistently,. After 3 million gallons of water it still would not pass a Bac T.

We Don't Guess, We Test and the Investigation Begins

With the ultimate goal to get this well back online as soon as possible, the questions are; why is this well different from the other 4? Why is it problematic to pass a Bac T when the others were not? What did we do different, if anything, or what do we need to do different? Is, are there anomalies with this well that we've not taken