Field Office Compliance - Assistance

Assistance ID - 58182
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
3/21/2013 From: Petersen, Ted [DNR] Sent: Thursday, March 14, 2013 9:43 AM To: Theobald, Jeff [DNR]; Gibbons, Bill [DNR]; Gastineau, Janet [DNR] Cc: Sievers, Jim [DNR]; Pham, Anne [DNR]; Grapp, Shelli [DNR]; Vansteenburg, Jeff [DNR] Subject: FW: Des Moines Water Works Following our meeting with Des Moines Water Works in February, Ted Corrigan provided this information. Yesterday they reported a main break to our office, the first one reported since 1993. As you know they do not plan to report all main breaks to our office – only those that may impact a large customer base or those where the failure may have caused “a significant increase in the potential for contamination”. When a portion of the distribution system has been dewatered and customers are w/o water, in most instances DNR would recommend a Tier 1 public notice approach. DSMWW contends that if their staff follows the repair, disinfection, flushing, and sampling guidelines (using at a minimum AWWA standards) that these routine main breaks will not cause a significant increase in the potential for contamination. In summary related to main breaks, Des Moines Water Works will contact our office if: • a main break impacts a large number of customers (news worthy), or • the boundaries of the impacted area are unknown, or • their procedure for repair, flushing, and sampling has been deviated (something occurred during the repair process that may have increased the potential for contamination), or • the operator is aware of other know factors that may increase the potential for contamination to the distribution system. After receiving the notification from DSMWW we will determine if any additional action is necessary and if a boil advisory is warranted. Until this reporting process with DSMWW is better understood (myself included!) please consult with Janet or I following a call from DSMWW related to main breaks. Gather all the information as you normally would then we can discuss the proper response. Jeff you handled the incident yesterday appropriately. Ted Corrigan stated that he was impressed with the questions you asked and the responses you provided. If you have any questions or if you have ideas on how to improve this process let me know. –Ted From: Corrigan, Ted [mailto:[email protected]] Sent: Thursday, February 28, 2013 4:58 PM To: Gastineau, Janet [DNR]; Petersen, Ted [DNR] Subject: Des Moines Water Works Ted and Janet, Thank you for taking the time to meet with us on the 14th of this month. I think it was good discussion and I now have a better understanding of your expectations related to water outages. Based on our discussions Des Moines Water Works has implemented two new processes. The first relates to collecting a second, 24-hour sample following every water outage. The second relates to notification of IDNR if we experience a loss of pressure due to a water main break in areas outside the limits of the area that will be shutdown, flushed, and sampled as part of repairing the water main break. Our processes have been updated to initiate a second sample work order each time the water is turned back on following a water outage be it an emergency or a scheduled outage. Loss of pressure incidents will be identified using existing remote pressure monitors and calls received from customers. Our Dispatchers received training this week on the types of questions to ask when calls are received and the type of information to record if they suspect or become aware that a loss of pressure has occurred outside the area that will be isolated for an outage. They will then contact the on-call supervisor and the supervisor will contact IDNR. A Boil Water Advisory template has been created and is attached for your review. I have also attached our Post Water Outage Flushing and Sampling Procedures and our Flushing and Sampling Form as you requested. The procedures will need to be updated to incorporate the 24-hour sample and to remove white cup testing now that all of our valve trucks are equipped with field turbidity meters. Our lab folks visited with Anne Lynam about submitting the after outage samples to DNR. She advised that in Chapter 83 of the Iowa Administrative Code 83.6(6)a.(1)3 states that samples taken for water main repair of installation are not require to be reported by the laboratory to the department. JANET GASTINEAU
3/15/2013 From: Gastineau, Janet [DNR] Sent: Thursday, March 14, 2013 11:30 AM To: Bunton, Jennifer [DNR]; Sievers, Julie [DNR] Cc: Brandt, Paul [DNR] Subject: membrane MOR questions In reviewing DMWW’s use of the membrane MOR for the first time, I have the following questions that I need help with. 1. Where does the 0.15 NTU originate in the indirect integrity test (IIT) column? DMWW IVP calls for a response at >1 NTU, so would like to change the column header to be consistent with that. 2. What size particle should a system consider when reporting the daily highest particle count in the IIT section? 3. Is it OK to report the DIT PFinal in pascals rather than psi? 4. Any harm if DMWW reports Pdm rather than ?Ptest? 5. Should daily max TMP be reported as the largest value or the most negative value? They draw a vacuum through their membranes, so the pressures are negative. 6. DMWW performs a DIT after maintenance. Do these results go into consideration for compliance or just the automated DITs? Sometimes the post maintenance DIT LRVs are elevated. JANET GASTINEAU
3/15/2013 From: Gastineau, Janet [DNR] Sent: Friday, March 15, 2013 8:01 AM To: '[email protected]' Subject: FW: turbidity.doc Public notice instructions and required language can also be found at http://www.iowadnr.gov/InsideDNR/RegulatoryWater/DrinkingWaterCompliance/PublicNotice.aspx The v calculation can be used for compliance when a surface water system does not maintain adequate distribution system chlorine residuals. I am just trying to sort out whether this applies to free or total residuals and whether the values used are account for residual measured at the time of total coliform collection or part of the daily self-monitoring. JANET GASTINEAU
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