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Page 1 of <br /> Statz, Mark R <br /> From: Neprash, Randy D <br /> Sent: Friday, September 12, 2008 4:58 PM <br /> To: Statz, Mark R; Dallas Larson <br /> Subject: FW: Here's an interesting question - irrigation and contamination <br /> Dallas and Mark: <br /> Here's the E -mail questions I just sent to the MPCA. <br /> Randy Neprash, PE <br /> Tel 651-604-4703 <br /> randy.neprash@bonestroo.com <br /> Bon estroo <br /> 2335 Highway 36 W <br /> St. Paul/MN 55113 <br /> Tel 651 =636 -4600 <br /> Fax 651- 636 -1311 <br /> www.bonestroo.com <br /> From: Neprash, Randy D <br /> Sent: Friday, September 12, 2008 4:57 PM <br /> To: Bruce Wilson (Bruce.Wilson @state.mn.us); Dale Thompson (Dale.Thompson @state.mn.us) <br /> Subject: Here's an interesting question - irrigation and contamination <br /> Dale & Bruce: <br /> Here's an interesting question. It was raised by the concerns related to dredged material from stormwater ponds. <br /> One volume reduction technique that is being considered and implemented by cities is to take water from stormwater ponds and us <br /> it for Irrigation. Some of the areas irrigated are lawns and parks that are used by large numbers of people, especially children. <br /> We have significant concerns about pollutants in the sediment of stormwater ponds. Should we be concerned about contaminating <br /> the ground and threatening human health by using pond water for irrigation? Should we be limiting the use of water from <br /> stormwater ponds for irrigation? <br /> My very limited understanding is that the sedimentation process concentrates pollutants over time. The levels of pollutants in the <br /> pond water is quite low. Would we see the same concentration process in the ground under an irrigated park field? Is the fact that <br /> this ground is exposed to rainfall change the equation? Do we need to put the brakes on a volume reduction technique that we <br /> thought was worthy of promoting? <br /> Can you folks answer these questions and provide some guidance on this subject? If yes, how soon can we expect to see this <br /> guidance? We 've got cities that are moving right now toward building systems based on using irrigation as a volume reduction <br /> technique. <br /> Thanks, <br /> Randy Neprash, PE <br /> Tel 651-604-4703 <br /> randy.neprash@bonestroo.com <br /> 10/21/2009 <br />