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C -42 to 60 inches; yellowish red (5YR 5/8) very fine sandy loam, yellowish red (5YR 4/8) moist; <br />massive; soft, very friable; few fine pores; very slightly effervescent, carbonates are disseminated; <br />strongly alkaline (pH 8.1). <br />TYPE LOCATION: San Juan County, Utah; 7 miles east and 5 miles north of Navajo Mountain School; <br />SW 1/4, SE 1/4 sec. 31, T. 42 S., R. 17 E. <br />RANGE IN CHARACTERISTICS: The mean annual soil temperature ranges from 47 to 57 degrees F. <br />The mean summer soil temperature at a depth of 20 inches ranges from 61 to 65 degrees F. In 7 out <br />of 10 years the soils are dry in all parts of the moisture control section for 50 to 75 percent of the time <br />(cumulative) that the soil temperature at depth of 20 inches is above 41 degrees F. The soils are moist <br />in some part of the moisture control section for 30 to 40 days during the summer and are dry in some <br />part of the moisture control section for 60 to 90 consecutive days during winter and early spring and are <br />moist in some parts between July and October. <br />The combined thickness of the A and B horizons is 35 to 50 inches. The depth to secondary <br />carbonates ranges from 12 to 22 inches. The series particle -size control section ranges from 15 to 40 <br />percent fine sand or coarser and 0 to 15 percent rock fragments. <br />The A horizon has hue of 2.5YR through 10YR, value of 4 through 6 dry, 3 through 5 moist, and <br />chroma of 3 through 6. Reaction is slightly alkaline or moderately alkaline. Carbonate content ranges <br />from 0 to 3 percent. <br />The Bw horizon has hue of 2.5YR to 7.5YR, value of 4 through 6 dry, 3 through 5 moist, and chroma <br />of 4 through 8. This horizon ranges from very fine sandy loam, loamy very fine sand, fine sandy loam, <br />sandy loam and is mildly alkaline to strongly alkaline. Carbonate content ranges from 0 to 3 percent. <br />The Bk and C horizons have hue of 2.5YR through 7.5YR, value of 5 through 8 dry, and 4 through 8 <br />moist, and chroma of 4 through 6. This horizon ranges from very fine sandy loam, fine sandy loam, or <br />sandy loam, and thin strata of gravelly fine sandy loam, or loamy fine sand, below a depth of 40 inches. <br />Reaction ranges from slightly alkaline to strongly alkaline. Carbonate content ranges from 0 to 5 <br />percent. <br />COMPETING SERIES: These are the Ignacio (NM), Parida (NM), Remmit (CO), Sandspring (T AZ), <br />and Turnback (WY) series. Ignacio and Turnback soils have bedrock at depths of 20 to 40 inches. <br />(Revised July 2010) Attachment 2.04.9 -3 -8 <br />