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HALL GULCH Hall Gulch pit is located about 4 miles Norht of Tarryall Reservoir. The site is on a Northeast facing slops The slope is 7 - 10%. The area has been used as a native range land in the past. Soils The soil at this site is identified as Soils Unit 20D. This mapping unit occurs on gently sloping to sloping mountain slopes. These soils are developing on Pikes Peak Rranite. They are shallow to moderately deep and are gravelly throughout. Nost of the surface has scattered gravel and in places, cobble. In a few places rock outcrop occurs. The surface layer ranges in thickness from 3 to 10 inches. It is dark colored and is gravelly sandy loam. The subsoil ranges in texture from gravelly heavy sandy loam to gravelly clay loam. The materail underlying the subsoil is disintegrating Pikes Peak granite, mostly gravel and/or cobble with a sandy clay loam matrix. In some places hard bedrock may occur at depths from 20 to 40 inches. Disintegrating franite occurs at depths of 6 to 15 inches. These so41s are subject of severe water erosion when the surface is not protected by adequate vegetative cover. The water intake rate is moderate. The water holding capacity is moderate to low. This soil is shallow to moderately deep. It occurs on rolling to steep mountain slopes. It is developing on Pikes Peak granite. At the type location this soil is on a 38 percent slope facing south. The elevation is approximately 9,250 feet. Al 0-5" Dark brown (7.SYR 4/2) sandy loam, very dark brown (7.SYR 2/2) moist; moderate fine granular structure; soft, very friable; this horizon contains 5 to 10 percent gravel; noncalcareous; gradual and smooth boundary. B1 5-11" Brown (7.SYR 4/2) gravelly sandy clay loam, dark brown (7.SYR 3/2) moist; weak fine blocky structure; soft, very friable; this horizon contains 15 to 20 percent gravel; noncalcareous; gradual and smooth boundary. $2t 11-18" Brown (7.SYR 4/4) gravelly clay loam, dark brown (7.SYR 3/4) moist; weak coarse primatic structure breaking to weak meduim and fine subangular blocks; slightly hard, very friable; thin patchy clay films on the ped faces; this horizon contains about 40 percent gravel; noncalcareous; gradual and smooth boundary.