02/27/2008 Env Bd Packet - Laserfiche WebLink

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• ISANTI SERIES Official Soil Series Description The Isanti series consists of very deep, poorly and very poorly drained soils that formed in sandy glacial outwash or eolian sediments on outwash plains and valley trains. These soils have moderately rapid or rapid permeability in the upper part and rapid permeability in the lower part. Slopes range from 0 to 2 percent. Mean annual precipitation is about 26 inches. Mean annual air temperature is about 44 degrees F. TAXONOMIC CLASS: Sandy, mixed, frigid Typic Endoaquolls TYPICAL PEDON: Isanti fine sandy loam on a slightly concave slope of less than 1 percent in native vegetation. (Colors described are for moist conditions unless otherwise stated.) A1-0 to 4 inches; black (10YR 2/1) fine sandy loam; weak medium platy structure; very friable; common roots; strongly acid; abrupt smooth boundary. A2-4 to 10 inches; black (N 2/0) fine sandy loam; weak thin platy structure; very friable; common roots; strongly acid; abrupt wavy boundary. (Combined thickness of A horizons is 7 to 18 inches.) Bgl -10 to 14 inches; gray (N 5/0) fine sand; single grain; loose; few roots; common very dark gray (10YR 3/1) 1 to 3 cm thick discontinuous horizontal streaks and a few small black inclusions; moderately acid; clear wavy boundary. Bg2 - -14 to 26 inches; gray (10YR 5/1) fine sand; single grain; loose; few roots; strongly acid; abrupt smooth boundary. Bg3 - -26 to 31 inches; dark gray (10YR 4/1) fine sand; single grain; loose; moderately acid; abrupt wavy boundary. (Combined thickness of Bg horizons is 13 to 36 inches.) Cg -31 to 60 inches; light brownish gray (10YR 6/2) fine sand; single grain; loose; moderately acid; gradual smooth boundary. TYPE LOCATION: Anoka County, Minnesota; about 7 miles east of Anoka; 1,345 feet east and 960 feet north of the southwest corner of sec. 5, T. 31 N., R. 23 W.; USGS Circle Pines quadrangle; lat. 45 degrees 12 minutes 0 seconds N. and long. 93 degrees 14 minutes 20 seconds W., NAD27. RANGE IN CHARACTERISTICS: The series control section is dominated by fine sand and has 85 percent or more passing the No. 40 sieve. It also has no rock fragments. Some pedons have an 0 horizon as much as 6 inches thick. The mollic epipedon ranges from 10 to 18 inches in thickness where texture is loamy fine sand or coarser and 7 to 18 inches in thickness for those soils with finer textures. The A horizon has hue of 10YR, 2.5Y, 5Y or is neutral. Some pedons have an AB or BA horizon as much as 6 inches thick. The A horizon is loamy fine sand, fine sand, sand, loamy sand, fine sandy loam, or sandy loam. It ranges from slightly acid to strongly acid. The Bg horizons have hue of 10YR, 2.5Y or 5Y, value of 4 or 5, and chroma of 1 or 2, or is neutral with value of 4 or 5. In some pedons it has discontinuous nearly horizontal remnants as well as involutions of the A horizon 0.5 to 10 cm thick that presumably resulted from frost action. It is fine sand, sand, loamy fine sand or loamy sand. It ranges from slightly acid to strongly acid. Some pedons have a BC horizon. The Cg horizon has hue of 10YR to 5Y, value of 5 or 6, and chroma of 1 or 2. It is sand, fine sand, loamy sand, or loamy fine sand. Reaction is moderately acid to mildly alkaline. Foxborough Conservation Development Restoration and Management Plan A -2