03/31/2004 Env Bd Packet - Laserfiche WebLink

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the grade plan so there is no way review the intentions of tree - save /tree - removal (or our goal to save significant trees) except where there is an obvious inference to removal such as a road. . According to the tree preservation -fence drawing, since most of the buildable area follows the upland tree types, most of the trees will be lost on the site. See Attachment 6 and Attachment 13. Four specimen trees are identified, and all but one of them is to be removed. Recommend that the trees be overlaid on the grade plan and a meeting set to discuss the boundary of the tree preservation lines. The entire area is a matrix of wetland (Attachment 6) to upland vegetation (including the trees). Most of the Aspen /Aspen & Birch buffering wetlands will be lost. I have identified some areas throughout the City as rare vegetation habitat, with possible rare vegetation location points. Fox Den has two such points located in a rare eco- corridor mostly following CD25. These areas most usually are found in a flood plain area. The two points identified are on disturbed areas and there are no rare plants present on the site. Recommend that this rare eco corridor be preserved as open space through conservation easement or plat as "City". Soils A good part of the site is "isanti wet" soils. The seasonally high water table in Isanti wet soils are very shallow, between 0 and 2 feet. The rest of the site is for the most part Solderville soils. See Attachment 10. The seasonally high water table in Solderville soils is between 2-4 foot from the surface. These soils are also very permeable. The developer should demonstrate in all cases, especially proposed NURP pond areas that there would be at least 4 feet of separation between the bottom of the NURP ponds and the seasonally high ground water table. The ponds are designed in isanti wet soils and Soderville soils. Seasonally high water tables for these two soil types are 0 -2 feet and 2 -4 feet respectively. It is important that the developer demonstrate achievement of this 4 -foot separation so that the ground water is not polluted. This pollution can happen in a very short time in these soils according to the Anoka County Soil Ground water Model. Most of the proposed Fox Den Acres pond bottoms are designed at or below the indicated DNR ordinary high water level. Seasonally high levels of the ground water should be determined by soil boring investigation. Given that this area is so low, and the water table high, it is assumed that there will need to be substantial fill imported to allow for building. This fill should be similar soils and not allowed without City approval. Exporting soils should not be allowed without City approval. The developer is planing on phasing his grade work. This is good in terms of protecting soils in other areas from compaction. Soil compaction should further be addressed by fencing off any areas not destined for grade work. Rock entrances should have an additional stockpile of rock available to top dress when the rock becomes filled.