Field Office Compliance - Assistance

Assistance ID - 103235
Des Moines Water Works - 310338211
9966 Maffitt Lake Dr Cumming, IA 50061
Dallas County

FO 5

Report
File Name File Type File Date Note
Comments
10/4/2018 Kyle Danley and Mike Adams just called to inform us that they are experiencing some major telemetry issues at their remote sites (booster stations and towers only, not treatment sites). Late last week they noticed some reduced communication with some of their radio telemetry. Over the weekend they completely lost communication with the LP Moon booster station and ASR as well as the Norwalk EST. In working with the Des Moines Police Department they have determined that there is another signal that is interfering with their frequency. They are working with Electronics Engineering as well as their own DMWW staff to try and identify the signal that is interfering with their frequency. Over the weekend there was a period of time that no chlorine residual data was available from the LP Moon ASR. The PLC onsite is programmed to shut off the recovery well if chlorine residuals are low for a period of 15 minutes, such a shut down was not triggered, nor was such an event believed to have occurred. The continuous analyzer was working and the volume of chlorine used was representative of normal operation, but without the telemetry the readings from the analyzer during that time are not available. The ASR was manually shutdown until the telemetry issue is resolved. The Norwalk EST is being visited for observation at least every 5 hours to determine the tower level. No low tower levels have been observed. Some towers in the system may have been overflowed due to lack of tower level information via telemetry, but there have not been any reports of low levels/low pressure. The consecutive systems that utilize DMWW continuous analyzers as their Source/Entry Point residual sampling have reportedly been informed (by DMWW staff) that the data will not be readily available through the telemetry and that physical observations of the analyzer or grab sampling will need to be conducted for the time being. TOM ATKINSON
State of Iowa DNR Home Site Policy
Leading Iowans in caring for our natural resources
Version: 2.3.1.23706
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