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<br />. <br /> <br />Page 3 of3 <br /> <br />Bioretention Area: <br />Upon our site visit, the surface of the bioretention / raingarden area was dry. We used a soil-penetrometer on the replacement <br />soils in the raingarden and we were easily able to push in the penetrometer to its full length of 30" - soils in the raingarden appear <br />to be in really good shape, although we didn't have a device deep enough to hit the sub-soils area. <br /> <br />How long has the raingarden been ponding water after it has been filled up to the overflow elevation? Is the under-drain <br />functioning as intended? <br /> <br />Vegetation in the basin & side slopes has some gaps / voids (some species didn't make it) and should be filled in with plants that <br />have proven to establish successfully in these situations (such as the shrubs, sedges, iris, etc.). <br /> <br />Shoreland Stabilization / Buffer: <br />Two biofogs appear to have come loose from the bank toe at the north end of the shoreline project. They should be re-staked / <br />anchored. <br /> <br />Some planting areas in the shoreland transitional zone have a an uneven distribution of sedges and other strongly-rooting plants. <br />Because of the wave-pressures that will always exist, the transitional area should be planted more densely with more sedges and <br />grasses, among the existing shoreland plantings. The biologs should also be planted (at a 12" spacing) with aquatic/transitional <br />species, such as three-square bulrush, lake sedge, etc. <br /> <br />Also, regarding the wave-breaker / floating silt-curtain, it may be a good idea to install something, like a cedar tree revetment along <br />the shoreline in front of the bi%gs in the areas most heavily impacted by wave action / slope degree. The Anoka Conservation <br />District has recently harvested some cedar trees off of a site that was being bulldozed in Blaine. We could transport down some of <br />these cedar trees, but anchors would need to be purchased to secure them in place. <br /> <br />I'm attaching a powerpoint fiie with photos from my site visit on 9/14/2007, along with notes on the slides of my observations and <br />suggestions. Overall, I think the project looks nice and seems to be working well - I would just want to hear more on how long the <br />raingarden area has standing water in it after the rain has stopped. <br /> <br />Thanks, <br />Gregg <br /> <br />Gregg Thompson <br />Urban Conservation Specialist <br />Association of Metropolitan Soil & Water Conservation Districts <br />16015 Central Avenue NE #103 <br />Ham Lake, MN 55304 <br />(763) 434-2030 x. 15 <br />(763) 286-6985 (cell) <br />metroswcd@isd.net <br /> <br />9/25/2007 <br />