Field Office Compliance - Assistance

Assistance ID - 75714
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
1/13/2015 From: Gastineau, Janet [DNR] Sent: Tuesday, January 13, 2015 6:52 AM To: 'McCurnin, Mike' Cc: Lynam, Anne [DNR]; Petersen, Ted [DNR] Subject: RE: Nitrate Concentrations - - Salt Shortage You are correct. The nitrate MCL = 10 mg/L as N. A system exceeds the nitrate MCL if the result is >10.5 mg/L. From: McCurnin, Mike [mailto:[email protected]] Sent: Monday, January 12, 2015 5:41 PM To: Gastineau, Janet [DNR] Subject: Nitrate Concentrations - - Salt Shortage Janet: Never a dull moment here………. I have a critical question that I need to ask of DNR. We are in the midst of nitrate season here and our salt supply chain has been hampered severely by the severe temps/weather of last week in the upper US. We generally run our NO3 removal gear to keep the finished NO3 below 9 mg/l and often below 8.5 mg/l. We made provisions today to allow that level to rise above 9.0 mg/l and below 9.5 mg/l……………all in an effort to conserve salt. We also terminated all metro wide ASR injections to reduce our dependence upon the river. We hope normal salt deliveries will resume by weekend or early next week. My question deals with the MCL of 10. It is my understanding that we can measure NO3 levels as high as 10.49 mg/l in our finished and still report 10 mg/l. Additionally any values at/above 10.50 mg/l would round to 11 mg/l. Can you or others confirm/correct my understanding? Michael J. McCurnin, P.E. | Director of Water Production Des Moines Water Works | WATER YOU CAN TRUST FOR LIFE 2201 George Flagg Parkway | Des Moines, Iowa 50321 | www.dmww.com Phone: (515) 283-8709 | fax: (515) 283-8757 | e-mail: [email protected] JANET GASTINEAU
State of Iowa DNR Home Site Policy
Leading Iowans in caring for our natural resources
Version: 2.3.1.23706
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