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Version 4/2/2019 Page - 7 Public Works Quote <br />3.Day 3 - Contractor shall setup over the well for double disk cleaning with a line shaft turbine <br />pump. No other method is accepted and will result in disqualification of bid. A double disk <br />agitator measuring 60-inches in length shall be used. There shall be a fixed rubber disk mounted <br />atop and bottom of the device with slots or jets in between to allow for water movement. The <br />rubber disk shall be within ¼” of the screen inside diameter. <br />a.The double disk agitator shall be affixed to a vertical turbine test pump capable of producing <br />1,000 gpm supplied by the contractor. The well shall be double disked by slinging the vertical <br />turbine pump to the rig and working over 5 foot sections of screen at a time. <br />b.Inject 110 gallons of sodium hypochlorite, combined with 2,000 gallons of clear water into <br />well using a 1,000 gallon cleaning tank, equipped with a pump, to inject the solution under <br />pressure through the double disk agitator. <br />c.Leave the chlorine solution in the well for a minimum of 36 hours contact time. <br />4.Day 4 – Off site, 36 hour (min) contact time. <br />5.Day 5 – Cleaning Bottom 10 feet of Lower Screen <br />a.Pump off chlorine solution to waste, neutralizing any remaining chlorine. <br />b.Inject 330 gallons of inhibited and stabilized hydrochloric acid and 3,500 gallons of clear <br />water into the well using a 1,000 gallon cleaning tank to mix in equal portions per tank, <br />equipped with a pump, to inject the solution under pressure. Work this solution into the <br />bottom ten feet of screen with double disk. <br />c.Allow three (3) hours of contact time. <br />d.Work five (5)-foot sections of the bottom ten (10) feet of the lower screen with double disk for <br />a minimum of one (1) hour per five-foot section. <br />e.Pump off solution and neutralize any remaining acid with sodium bicarbonate. <br />f.Contractor is responsible for measuring and documenting the pH during pump off and <br />neutralizing any acid in the discharge. <br />g.Inject 110 gallons of sodium hypochlorite, combined with 2,000 gallons of clear water into <br />well using a 1,000 gallon cleaning tank, equipped with a pump, to inject the solution under <br />pressure through the double disk agitator. <br />h.Leave the chlorine solution in the well for a minimum of 36 hours contact time <br />6.Day 6 – Off site, 36 hour (min) contact time. <br />7.Day 7 – Cleaning Top 10 feet of Lower Screen <br />a.Pump off chlorine solution to waste, neutralizing any remaining chlorine. <br />b.Inject 330 gallons of inhibited and stabilized hydrochloric acid and 3,500 gallons of clear <br />water into the well using a 1,000 gallon cleaning tank to mix in equal portions per tank, <br />equipped with a pump, to inject the solution under pressure. Work this solution into the top <br />ten feet of screen with double disk. <br />c.Allow three (3) hours of contact time. <br />d.Work five (5)-foot sections of the top ten (10) feet of the lower screen with double disk for a <br />minimum of one (1) hour per five-foot section. <br />e.Pump off solution and neutralize any remaining acid with sodium bicarbonate. <br />f.Contractor is responsible for measuring and documenting the pH during pump off and <br />neutralizing any acid in the discharge. <br />g.Inject 110 gallons of sodium hypochlorite, combined with 2,000 gallons of clear water into <br />well using a 1,000 gallon cleaning tank, equipped with a pump, to inject the solution under <br />pressure through the double disk agitator. <br />h.Leave the chlorine solution in the well for a minimum of 36 hours contact time <br />8.Day 8 – Off site, 36 hour (min) contact time. <br />9.Day 9 – Cleaning Bottom 10 feet of Upper Screen <br />a.Pump off chlorine solution to waste, neutralizing any remaining chlorine. <br />b.Inject 330 gallons of inhibited and stabilized hydrochloric acid and 3,500 gallons of clear <br />water into the well using a 1,000 gallon cleaning tank to mix in equal portions per tank, <br />equipped with a pump, to inject the solution under pressure. Work this solution into the <br />bottom ten feet of screen with double disk.