Results from St. Paul, Minnesota
St. Paul had been using a blended phosphate product to get below the action level for lead without success. In early 2000, the existing contract ended and a new vendor was selected. In May 2000, the old product was shut off and feed of the new product began. The new product evidently had a slightly different formulation, for shortly after initiating use of the new product, there were coliform outbreaks throughout the city. The phosphate product was shut off. Disinfectant levels were increased and bacterial control was reestablished. After approximately three weeks, the phosphate product was reintroduced. Again, the bacterial control was lost, so once again the phosphate product was shut off.
Results from other water districts
Hibbard School, Rexburg, ID
This school in Eastern Idaho has its own well that provides drinking water for the school. The lead levels measured from the drinking fountains were as high as 120 PPB. This was the worst of all situations because little children were drinking water with high lead levels. ASI determined the treatment of the school could be done in a different fashion since it was not in use during non-school hours. Therefore treatment was initiated by mixing 4 ounces of AS-8150 into 40 gallons of water and pumped into the distribution system. At this concentration, the solution is quite turbid. Drinking fountains and faucets were operated until the turbid water came out, and then shut off.
This small housing development with 16 connections had elevated levels of lead and copper in their water. They had been threatened with fines by the Idaho Department of Environmental Quality. We initiated treatment and the lead levels were significantly reduced. The copper levels took a longer time, but were brought under control.
Beeline Water Association, Bonners Ferry, ID
This small system in Northern Idaho monitors two houses The results had been 78 and 65 PPB prior to treatment, and were non-detectable and 6 PPB with 9 months of AS-8150.
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