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History: Hi Angela, To "' Angel a_Brown @URSCorp.com "' <Ange la_B rown@ U RS Corp. com> cc bcc Subject RE: Raingarden Maintenance Costs ,1�9 This message has been replied to and forwarded. My slide from the ACWA conference is a little (or a lot) confusing. The anticipated $5001year maintenance cost for NE Holladay Street is wholly contributed to the rain gardens, as we're not planning on sweeping the porous pavement portion any more than the 10- timeslyear we already sweep standard streets in Gresham. The 3 rain gardens total about 500 square -feet in size, so you can say we anticipate the annual maintenance cost to be around $1/square-foot. On top of the annual maintenance cost, we anticipate needing to spend $1,500 or $31sf every 10 years for a larger -scale rehab. As a disclaimer, the costs I've presented are still very rough guesses, as we don't have very many public rain gardens or porous pavements and the ones we do have are relatively new. So far, we have not spent any time or money maintaining the public street rain gardens at NE Holladay (2.5 years old). They continue to look very nice and are performing well, and it's unclear about how much maintenance the adjacent property owners are taking on if any. We also are not spending any more maintaining our porous pavement streets than we do on standard ones. The City of Gresham already sweeps streets 10 times per year on average, which has been sufficient to prevent clogging of the porous systems. At some point in time maybe 5 -10 years out, I do anticipate having to do some type of maintenance to the streetside rain gardens, such as removal of some accumulated sediment, replanting and remulching. A better source of rain garden maintenance data is Henry Stevens with the City of Portland BES, The policy in place while I was there relied on the adjacent property owner for routine maintenance, but I believe they have since changed to perform more functions as a city. Hope this helps. Steve Fancher Watershed Division Manager City of Gresham, DES 503- 618 -2583 steve. fancher @greshamoregon.gov From: Angela_ Brown @URSCorp.com [ mailto :Angela_Brown @URSCorp.com] Sent: Monday, August 03, 2009 10,37 AM To: Fancher, Steve Subject: Raingarden Maintenance Costs f1i Steve - "Fancher, Steve" Steve .Fancher @greshemoregon.gov> 08/03/2009 01:58 PM lm working with Krista Reininga on a Stormwater Basin Plan for Eugene where we are proposing raingardens to manage runoff generated after UICs are decommissioned. 1 was wondering if you have any maintenance cost