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Graypoint series The Graypoint series its of deep. well drained soils that forted In moderately One alkuvkurn that Is "I. low over sand and gravel. Graypoktt soils are on nearly WM to moderately sloping &Nuvkd fens. Slopes are 0 to 9 percent. The mean annual precipitation is about 7 tnche% and the mean annual air tamperah re Is about 41 degrees F. Graypoint spits are similar to the San Arcacio soils and are now the Derrick, Dunul, Sart Arcado, and Platom soils. Derrick and Draw( sols aro more than 35 percent gravel and cobbles thmugftout. San Arcedo and Plage soda are more them 20 Inches deep over sarid and gravel layers, end San Arcade sops are only moderately wed drained and have moderate salt accumulations. Typical pedon of Graypoint gravelly sandy loam. 0 to 1 percent slopes, about 700 feet south and 860 feet went of the northeast comer of sec. 5. T. 33 N» R. 9 E.: A1-0 to 5 indtes; brown (10YR 513) gravelly sandy loam. dark brown (10YR 413) mist; week fine granular struct re: soft very friable; about 20 per- cent gravel; moderately alkaline; dear wavy bound - MY, B21---5 to 14 inches; yellowish brown 110YR 514) gravel- ly sandy clay loam, darty yellowish brown (10YA 414) moist; weak medium prismatic structure parting to moderate medium subangular blocky; hard, friable; thin nearly continuous clay films on pods and cost - WV gravel; about 25 percent gravel mildly atksl1w clear wavy bourtdaryr. 83ca-14 to 16 inches; pals brown (10YR 613) very gravelly sandy loam, dark brown (1M 4/3) moist; very weak medium subangular blocky structure; soft very friable; about 35 percent gravel; calctrrous with lime occurring as thin seems and coating um- deraide of gravel; moderately elkallne; dear wavy boundary - 110 -16 to 72 inches; light broMmish gray (10YR 612) send and gravel. mostly basalt, grayish brown (10YR 5/2) moist single grained; loose when dry or moist calcereaus in spots: moderately minute. Depth to uniformly calcareous material normally ranges from 6 to 20 inches. Depth lo the send and gravel layer ranges from 10 to 20 incites. Gravel content ranges from 10 to 35 percent In the r Qw part of the proft and Is dominantly one-quarter inch to 3 inches in diameter. SOIL SUR':E Derrick series The Derrick series consists of deep, wail drained softs that forted in very gravelly and cobbly alkMum over sand. gravel, and cobbles. Derrick soils are on alluvial fans and terraces. Slopes are 0 to 10 percent. The mean annual air temperature is about 41 degrees F. and the mean annual precipitation is about 7 inches. Oerrick soils are near the Graypoint, Dun ul, and Pla- toro soils. Graypoint soils have finer tenures and fewer cobbles in the upper part of the sol prorde. Duron soils aro gravelly sandy loam in the upper part of the profile. Platoro sods have a day roam B2t horizon that is less than 35 percent coarse fragments. Typical pedon of Derrick very cobbly sandy loam. 0 to 1 pacerd slopes. 150 feet south and 50 feet east of the northwest coater of sec. 31, T. 36 N., R. 8 E.; At -0 to 5 inches; pale brown 110YR 813) very cobbly dandy loam, da<1r brown VOYR 413) moist; weak fine granular structure; hard. very friable: about 20 percent gravel and 20 percent cobbles. mildly alka- line; dear wavy boundary_ 82t-5 to 12 inches: yellowish brown (10YR 5/4) vary gravelly clay loam, dark yellowish brown (10YR 414) most weak madiurn prismatic atn,cture parting to moderate medium subangular blocky; hard, firm; very thin patchy clay films on pads; about 30 per- cent gravel and 20 percent cobbles; mildly alkaline; dear wavy boundary. Clca-12 to 17 inches; fight brownish gray (10YR 612) very cobbly sandy loam, darts grayish brown J10YR 4/2) moist; massive: slightly hard, friable; about 30 percent gravel and 40 percent cobbles; visible sec- ondary calckrm carbonate occurring in titin seems and as coatings on undersides of cobbles; calcars - our.; moderately alkaline; clear wavy boundary. RC2 -17 to 60 inches; vary gravelly sand; massive; soft. very friable; calcareous with thin coatings of calcium carbonate on undersides of coarse fragments in upper part of the horizon; moderately alkaline. Depth to calcareous material ranges from 6 to 20 incites. Depth to unconformable sand and gravel ranges from 11 to 20 inches. Content of rock fragments ranges from 35 percent to about 70 percent in the solum. Summit Engineering Job Number: 1707122CE 44-7 719-589-6147 Alamosa, CO