Field Office Compliance - Assistance

Assistance ID - 114135

Central Disposal Systems, Inc - 311308153

21265 430th St Lake Mills, IA 50450

Winnebago County

FO 2

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File Name	File Type	File Date	Note

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Date	Comment	Commenter
7/20/2020	Cory J. Anderson <canderson@wenck.com> Attachments Fri, Jul 17, 3:09 PM (3 days ago) to Mike, me, Terry, Hunter, Michael, Jeri, Mark Good afternoon Mike and David, Below is a summary of the annual water quality monitoring event for Central Disposal completed on May 19-20. General: All wells sampled according to monitoring Schedule. The recent event completed May 19&20, 2020 included the Full IDNR App I List (metals & VOCs) in addition to the optimized parameters list (Intrawell Stats Parameters and Selected Annual Parameters) as shown on the attached (following once per 3-year schedule). GW elevations in general, slightly higher for this event compared to recent events and appear well within historical ranges. Preliminary Data Review: No VOC detections reported for any locations. For MW-2A (upgradient), elevated TSS and Turbidity due to pump being pulled to fix stuck check ball With minor exception inorganic results remain within historical ranges with No new GWPS/MCL Exceedances. Arsenic GW Performances Standard/MCL exceedances at locations and concentrations similar to historical. Cobalt GWPS exceedances for MW-2A, MW-131. MW-132, and MW-133. For each of these locations cobalt has been detected above the GWPS at some point in the past; however, for some of the wells cobalt hasn’t been detected during consecutive events above the standard and/or some of the past detections were not considered exceedances because the standard for cobalt was previously higher at that time. The statistical report received 7/16/20, indicates no verified control limit exceedances (unverified exceedance for chloride at MW-11). An Annual Water Quality Report discussing the annual monitoring event will be prepared and submitted for the record. Please let us know if you have any questions. Thanks. -Cory Cory J. Anderson Environmental Scientist	DAVID MILLER

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