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Alluvial Wells Chemical Treatment


Location
Missouri
Publication Date
09/14/2020 09:15 AM EDT
Closing Date
09/23/2020 03:00 PM EDT
Issuing Organization
City of O'Fallon
Solicitation Number
Description

Specifications include, but are not limited to: STEP ONE: PUMP REMOVAL1.Review treatment specifications with O’Fallon’s water plant supervisor. 2.Mobilize to well site. 3.Perform initial pump test to develop baseline data on pump condition, yield, and specific capacity. 4.Remove pump and column piping. Contractor will clean components as necessary to properly inspect for wear and inform City staff of deficiencies found.5.Breakdown pump and inspect for wear. Inform City staff of deficiencies found.6.Contractor will use a brush on the well screen and then remove the dislodged loose debris from well shaft before installation of surge block.STEP TWO: HYDROCHLORIC ACID TREATMENTUTILIZING 220 GALLONSOF 20 DEGREE BAUME (33%) INHIBITED HCL1.Using surge block, contractor supplied high velocity pump, and injection tank, contractor will isolate each individual area of the well screen and treat with the HCL, dilution water, and inhibitor.2.The acid surging / pumping process will be performed throughout each area of the well screen and allow solution to remain in well overnight.3.The next day, perform pumping and surging again.4.Pump to waste and neutralize toa minimum 6.0 PH. in surge tank prior to discharge.5.Perform pump test to determine effectiveness of the treatment.STEP THREE: PHOSPHORIC ACID TREATMENTUTILIZING 60 GALLONSOF 75% PHOSPHORIC ACID1.Using surge block, high velocity pump, and injection tank, Contractor will isolate each individual area of the well screen and treat with the Phosphoric Acid solution, dilution water, and a minimum of 10 gallons of Johnson NW-310 or Layne QC-21.2.Allow solution to remain in well overnight.3.Surge throughout the screen area again the next day before removing chemicals.4.Pump to waste and neutralize to a minimum PH 6.0 in surge tank prior to discharge.5.Perform pump test to determine effectiveness of the treatment.

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