Minnesota Wetland Conservation Act Notice of Decision - 2013

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CORDOVA SERIES The Cordova series consists of very deep,poorly drained soils that formed mostly in loamy calcareous glacial till on ground moraines and till plains. The upper part of the profile in some of these soils formed in modified glacial tilL These soils have moderately slow permeability.Their slopes are less than 2 percent. Mean annual precipitation is about 28 inches. Mean annual temperature is about 48 degrees F. TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Typic Argiaquolls TYPICAL PEDON: Cordova clay loam with a plane slope of 1 percent in a cultivated field. (Colors are for moist soil unless otherwise stated.) Ap--0 to 10 inches; black (N 2/0) clay loam, very dark gray (lOYR 3/1) dry; moderate medium subangular blocky structure; friable; about 1 percent gravel; neutral; abrupt wavy boundary. A--10 to 18 inches; black (N 2/0) clay loam, very dark gray (lOYR 3/1) dry; moderate medium subangular blocky structure; friable; about 1 percent gravel; neutral; clear wavy boundary. (Combined A horizon is 8 to 20 inches.) Btgl--18 to 30 inches; olive gray (SY 4/2) clay loam; few fine prominent dark yellowish brown (lOYR 4/6) Fe concentrations; moderate medium angular blocky structure parting to moderate fine angular blocky; friable; common very dark gray (SY 3/1) clay films on faces of peds and in pores; about 3 percent gravel; neutral; clear wavy boundary. Btg2--30 to 38 inches; olive gray (SY 5/2) clay loam; common tine pron�inent dark yellowish brown (lOYR 4/6) Fe concentrations; weak medium subangular blocky structure; friable; few distinct very dark gray (SY 3/1) clay tilms on faces of peds and in pores; about 3 percent gravel; neutral; abrupt wavy boundary. (Combined Btg horizon is 12 to 40 inches thick.) C--38 to 80 inches; light olive gray (SY 6/2) loam; common medium prominent yellowish brown (lOYR 5/6) Fe concentrations; massive; friable; about 5 percent gravel; strongly effervescent; stightly alkaline. TYPE LOCATION: Waseca County, Minnesota; about 5 miles north of Waseca; 550 feet south and 1 100 feet east of the northwest corner of Sec. 22, T.108N., R.22W.; USGS Morristown quadrangle; lat. 44 degrees 8 minutes 32 seconds N. and long. 93 degrees 27 minutes 45 seconds W., NAD27. RANGE IN CHARACTERISTICS: Depth to free carbonates ranges from 24 to 50 inches. Thickness of the mollic epipedon ranges from 10 to 24 inches. Rock fragment content is 2 to 6 percent throughout and is of mixed lithology, but some pedons have less than 2 percent in the upper part. The A horizons are neutral to moderately acid. The B horizons range from strongly acid to slightly alkaline. The Ap or A horizon has hue of lOYR, 2.SY or is neutral, value of 2 or 3 and chroma of 0 or l. lt is loam, silty clay loam, or clay loam. Eluviation is evident in some pedons by a few porous coatings on the faces of peds in the lower A and/or upper B horiozns.