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HomeMy WebLinkAboutLINDEN GROVE PUD - PRELIMINARY - 49-94 - SUBMITTAL DOCUMENTS - ROUND 1 - GEOTECHNICAL (SOILS) REPORTLARIMER COUNTY AREA, COLORADO 43 Capability units IIe-1, irrigated, and IIIe-6, dryland; Clayey Foothill range site; windbreak suitability group 1. 75—Nunn clay loam, 3 to 5 percent slopes. This gently sloping soil is on high terraces and fans. This soil has' 'a profile similar to the one described as rep- resentative of the series, but the combined thickness of the surface layer and subsoil is about 24 inches. Included with this soil in mapping are small areas of soils that are more sloping or less sloping and a few small areas of soils that have a surface layer of light clay. Also included are a few small areas of Satanta and Ulm soils. Runoff is medium. The hazard of water erosion is moderate, and the hazard of wind erosion is slight. If irrigated, this soil is suited to barley, alfalfa, and wheat and, to a lesser extent, corn, sugar beets, and beans. Under dryland management it is suited to wheat or barley. It is also well suited to pasture and native grasses. Capability units IIIe-2, irrigated, and IIIe-7, dryland; Clayey Foothill range site; windbreak suit- ability group 1. 76—Nunn clay loam, wet, I to 3 percent slopes. This nearly level somewhat poorly drained soil is on low terraces and alluvial fans, commonly adjacent to drainageways. This soil has a profile similar to the one described as representative of the series, but a seasonal high water table is at a depth of 20 to 30 inches during part of the growing season. Included with this soil in mapping are a few small areas of soils that have a strongly alkaline surface layer and a few small areas of soils that are moderately well drained. Also included are a few areas of soils that have a surface layer of loam or clay and a few areas of soils that are less sloping. Runoff is slow, and the hazard of erosion is slight. This soil is suited to pasture and hay. If the water table is lowered by management practices, corn, sugar beets, wheat, and barley can be grown. Capability unit IIIw-1, irrigated; Wet Meadow range site; windbreak suitability group 5. Otero Series The Otero series consists of deep, well drained soils that formed in alluvium and wind -deposited material. These soils are on alluvial fans and terraces. Elevation ranges from 4,800 to 5,600 feet. Slopes are 0 to 15 percent. The native vegetation is mainly blue grama, needlegrass, bluestems, and some forbs and shrubs. Mean annual precipitation ranges from 13 to 15 inches, mean annual air temperature ranges from 48' to 500 F, and the frost -free season ranges from 135 to 150 days. In a representative profile the surface layer is brown sandy loam about 4 inches thick. The underlying material is pale brown sandy loam about 13 inches thick over light brownish gray sandy loam. Permeability is rapid, and the available water ca- pacity is medium. Reaction is mildly alkaline above a depth of about 4 inches and moderately alkaline below that depth. These soils are used mainly for native grasses and for dryfarmed crops. A few areas are used for ir- rigated crops. Representative profile of Otero sandy loam in an area of Otero -Nelson sandy loams, 3 to 25 percent slopes, in native grass, about 300 feet south and 1,420 feet west of the northeast corner of sec. 11, T. 10 N., R. 68 W.: A1-0 to 4 inches; brown (10YR 5/3) sandy loam, dark brown (10YR 3/3) moist; weak very fine granular structure; soft, very friable; calcareous; mildly alka- line; clear smooth boundary. Clca-4 to 17 inches; pale brown (10YR 6/3) sandy loam, brown. (10YR 5/3) moist; weak medium and coarse subangular blocky structure; hard, very friable; cal- careous; visible calcium carbonate as few soft spots; moderately alkaline; gradual smooth boundary. C2ca-17 to 60 inches; light brownish gray (10YR 6/2) sandy loam, dark grayish brown (10YR 4/2) moist; massive; hard, very friable; calcareous; visible calcium carbonate as few soft spots; moderately alkaline. The A horizon is sandy loam or fine sandy loam 8 to 12 inches thick in cultivated areas. The C horizon is sandy loam or fine sandy loam. The soil is generally calcareous throughout, but the surface layer is leached in places. Distribution of lime in the profile is erratic. Soft sandstone is at a depth of 40 to 60 inches in some profiles. 77—Otero sandy loam, 0 to 3 percent slopes. This nearly level soil is on uplands and fans. This soil has a profile similar to the one described as representative of the series, but the surface layer is about 10 to 12 inches thick. Included with this soil in mapping are some small areas of soils that have a surface layer of'loam or fine sandy loam. Also included are some areas of soils that are redder and a few small areas of Ascalon, Nelson, and Kim soils. Runoff is slow. The hazard of water erosion is slight, and the hazard of wind erosion is moderate. If irrigated, this soil is suited to corn, barley, sugar beets, wheat, and beans. Under dryland management it is suited to pasture and native grasses and, to a lesser extent, wheat and barley. Capability units IIIe-5, irrigated, and IVe-5, dryland; Sandy Plains range site; windbreak suitability group 2. 78—Otero sandy loam, 3 to 5 percent slopes. This gently sloping soil is on uplands and fans. This soil has a profile similar to the one described as representa- tive of the series, but the surface layer is about 8 inches thick. Included with this soil in mapping are a few small areas of soils that are more sloping or less sloping. Also included are some small areas of soils in which sandstone is at a depth of 40 to 60 inches and a few small areas of Ascalon, Nelson, and Kim soils. Runoff is medium, and the hazard of erosion is moderate. If irrigated, this soil is suited to barley, wheat, alfalfa, and pasture and, to a lesser extent, corn and beans. Under dryland management it is well suited to pasture and native grasses. Capability units IIIe-4, irrigated, and VIe-2, dryland; Sandy Plains range site; windbreak suitability group 2. 42 SOIL SURVEY 4/3) moist; moderate medium and coarse prismatic structure parting to moderate medium subangular blocky; very hard, firm, very sticky and very plastic; thin nearly continuous clay films on peds ; noncalcareous; mildly alkaline; clear smooth boundary. B3ca-24 to 29 inches; pale brown (10YR 6/3) clay loam, brown (10YR 5/3) moist; weak medium subangular blocky struc- ture; very hard, firm, very plastic; few thin patchy films. on ped faces; visible calcium carbonate occurring as small nodules; calcareous; moderately alka- line; gradual smooth boundary. Clca-29 to 47 inches; light yellowish brown (10YR 6/4) clay loam, dark yellowish brown (10YR 4/4) moist; massive; very hard, firm, sticky and plastic; visible calcium carbonate occurring as nodules, thin seams, and streaks; calcareous; moderately alkaline; gradual smooth boundary. C2ca-47 to 60 inches; light yellowish brown „(2.5Y 6/3) clay loam, light olive brown (2.5Y 5/3) moist; massive; very hard, firm, sticky and plastic; some visible calcium carbonate but less than in the Clca horizon; calcareous; moderately alkaline. The A horizon is light clay loam or clay loam 10 to 12 inches thick in cultivated areas. The combined thick- ness of the A and B horizons ranges from 16 to 40 inches. The B2t horizon is heavy clay loam or light clay. Depth to calcareous material ranges from 10 to 30 inches. Sand and gravel are below a depth of 40 inches in some profiles. Some profiles have substrata with a redder hue. 73—Nunn clay loam, 0 to 1 percent slopes. This level soil is on high terraces and fans. This soil has a profile similar to the one described as representative of the series, but the combined thickness of the surface layer and subsoil is about 35 inches. Included with this soil in mapping are small areas of soils that are more sloping. Also included are a few small areas of Satanta, Fort Collins, and Ulm soils and a few small areas of soils that have a surface layer and subsoil of silty clay loam. Runoff is slow, and the hazard of erosion is slight. If irrigated, this soil is suited to corn, sugar beets, beans, barley, wheat, and alfalfa. Under dryland management it is suited to wheat or barley. It is also suited to pasture and native grasses. Capability units Its-1, irrigated, and IIIc-1, dryland; Clayey Foothill range site; windbreak suitability group 1. 74—Nunn clay loam, 1 to 3 percent slopes. This nearly level soil is on high terraces and fans. This soil has the profile described as representative of the series. Included with this soil in mapping are a few small areas of soils that are more sloping or less sloping and a few small areas of soils that have a surface layer and subsoil of silty clay loam. Also included are small areas of Satanta, Fort Collins, and Ulm soils. Runoff is slow to medium, the hazard of wind erosion is slight, and the hazard of water erosion is moderate. If irrigated, this soil is suited to corn, sugar beets, beans, barley, alfalfa, and wheat. Under dryland management it is suited to wheat and barley. It is also well suited to pasture or native grasses (fig. 10). Figure IO.—Alfalfa bales on Nunn clay loam, 1 to 3 percent slopes. 41 LARIMER COUNTY AREA, COLORADO sandy loam. Depth to calcareous material is 0 to 4 inches. 71—Nel8on fine sandy loam, 3 to 9 percent slopes. This gently sloping to moderately sloping soil is on uplands. Included with this soil in mapping are small areas of soils that are more sloping or less sloping. Also in- cluded are some small areas of Otero and Tassel soils. Runoff is medium, and the hazard of erosion is severe. If irrigated, this soil is suited to pasture and, to a lesser extent, barley and wheat. Under dryland man- agement it is suited to pasture or native grasses. Capa- bility units IVe-2, irrigated, and VIe-2, dryland; Sandy Plains range site; windbreak suitability group 2. Newfork Series The Newfork series consists of deep, somewhat poorly drained soils that formed in alluvium. These soils are on low terraces and flood plains and are underlain by sand and gravel at a depth of 10 to 20 inches. Elevation ranges from 7,800 to 8,800 feet. Slopes are 0 to 3 percent. The native vegetation is mainly timothy, redtop, sedges, rushes, and water - tolerant grasses. Mean annual precipitation ranges from 12 to 16 inches, mean annual air temperature ranges from 420 to 440 F, and the frost -free season ranges from 60 to 85 days. In a representative profile a 1-inch-thick layer of organic material is on the surface. The surface layer is mottled grayish brown sandy loam about 4 inches thick. The subsoil is mottled dark brown heavy sandy loam 6 inches thick. Below this is mottled sand and gravel. Permeability is moderately rapid above a depth of about 10 inches and very rapid below that depth. The available water capacity is low. Reaction is slightly acid. These soils are used for irrigated hay. Representative profile of Newfork sandy loam, 0 to 3 percent slopes, in native grass, about 1,500 feet west and 1,300 feet south of the northeast corner of sec. 18, T. 11 N., R. 76 W.: 01-1 inch to 0; undecomposed and partly de- composed organic material. Alg-0 to 4 inches; grayish brown (10YR 5/2) sandy loam, very dark grayish brown (10YR 3/2) moist; common medium distinct yellowish red (5YR 4/6) mot- tles; weak medium subangular blocky structure parting to weak fine and medium granular structure; slightly hard, very friable; 5 percent gravel; slightly acid; clear smooth boundary. B2g-4 to 10 inches; dark brown (7.5YR 4/2) heavy sandy loam, dark brown (7.5YR 3/2) moist; moderate fine distinct red (2.5YR 5/8) mottles; moderate medium subangular blocky structure; hard, very friable; 10 percent gravel; slightly acid; gradual wavy boundary. IICg-10 to 60 inches; sand and gravel; many medium distinct bright colored mottles; slightly acid. The A horizon is loam, sandy loam, or sandy clay loam 3 to 10 inches thick. The B2g horizon is sandy loam or light sandy clay loam. The A and B horizons range from slightly acid to neutral. Content of rock fragments ranges from 0 to 15 percent in the upper part of the profile and from 35 to 70 percent in the lower part. 72—Newfork sandy loam, 0 to 3 percent elopes. This nearly level soil is on low terraces, flood plains, and fans. Included with this soil in mapping are small areas of gravel bars. Also included are a few small areas of soils in which gravel and sand is at a depth of 20 to 40 inches and a few small areas of Foxcreek soils. Runoff is slow, and the hazard of erosion is slight. If irrigated, this soil is suited to hay or pasture. Capability unit VIw-1, irrigated; Mountain Meadow range site; not assigned to a windbreak suitability group. Nunn Series The Nunn series consists of deep, well drained soils that formed in alluvium. These soils are on terraces and alluvial fans. Elevation ranges from 4,800 to 5,600 feet. Slopes are 0 to 5 percent. The native vegetation is mainly blue grama, buffalograss, needlegrass, and wheatgrasses. Mean annual precipitation ranges from 13 to 15 inches, mean annual air temperature ranges from 48' to 50' F, and the frost -free season ranges from 135 to 150 days. In a representative profile the surface layer is gray- ish brown light clay loam about 6 inches thick. The subsoil is grayish brown or pale brown clay loam about 23 inches thick. The underlying material is light yellowish brown clay loam. Permeability is slow, and the available water capac- ity is high. Reaction is neutral above a; depth of 10 inches, mildly alkaline between depths of 10 and 24 inches, and moderately alkaline below a depth of 24 inches. These soils are used mainly for irrigated and dry - farmed crops and for pasture. A few areas are used for native grasses. Representative profile of Nunn clay loam, 1 to 3 percent slopes, in grass, near the east quarter -corner of sec. 5, T. 6 N., R. 68 W. : A1-0 to 6 inches; grayish brown (10YR 5/2) light clay loam, very dark grayish brown (10YR 3/2) moist; moderate medium granular structure; soft, very friable; noncalcareous; neutral; clear smooth boundary. B1-6 to 10 inches; grayish brown (10YR 5/2) clay loam, very grayish brown (10YR 3/2) moist; weak medium prismatic structure parting to moderate medium subangular blocky; hard, very friable, plastic and sticky; few thin patchy clay films on peds; noncalcareous; neutral; clear smooth boundary. B2t-10 to 24 inches; pale brown (10YR 6/3) heavy clay loam, dark brown (10YR LARIMER COUNTY AREA, COLORADO Figure 9.—Area of Longmont clay, 0 to 3 percent slopes. ular structure; hard, friable; common faint mottles; slightly effervescent; mildly alkaline; clear smooth boundary. Al2g-8 to 15 inches; grayish brown (10YR 5/2) clay loam, very dark grayish brown (10YR 3/2) moist; weak fine subangu- lar blocky structure; hard, firm; com- mon medium distinct light reddish brown (5YR 6/4) mottles; strongly ef- fervescent; moderately alkaline; grad- ual smooth boundary. Clg-15 to 32 inches; grayish brown (10YR 5/2) clay loam, dark grayish brown (10YR 4/2) moist; massive; hard, firm; com- mon medium distinct light reddish brown (5YR 6/4) mottles; strongly ef- fervescent; moderately alkaline; grad- ual smooth boundary. IIC2g-32 to 60 inches; mixed sand, gravel, and cobbles; light reddish brown (5YR 6/4) mottles. The A horizon is loam or clay loam 12 to 20 inches thick. It is mottled in the lower part. The Cl horizon is loam or light clay loam. The A and C horizons range from neutral to moderately alkaline. Content of rock fragments is 0 to 15 percent in the upper part of the profile and 35 to 60 percent in the lower part. 64—Loveland clay loam, 0 to 1 percent slopes. This level soil is on low terraces and flood plains. 37 Included with this soil in mapping are a few small areas of soils that are more sloping, small areas of soils in which gravel is at a depth of 40 to 60 inches, and a few small areas of soils that have a surface layer of loam. Also included are small areas of Poudre soils. Runoff is slow, and the hazard of water erosion is slight. If irrigated, this soil is suited to barley and pasture. If drained, it is suited to corn and, to a lesser extent, sugar beets. Under dryland management it is well suited to pasture and native grasses. Capability units IIIw-1, irrigated, and Vw-1, dryland; Wet Meadow range site; windbreak suitability group 5. Midway Series The Midway series consists of shallow, well drained soils that formed in material weathered from shale. These soils are on uplands and are underlain by soft shale at a depth of 10 to 20 inches. Elevation ranges from 4,800 to 5,800 feet. Slopes are 5 to 25 percent. The native vegetation is blue grama, buffalograss, western wheatgrass, cactus, and fringed sage. Mean annual precipitation ranges from 13 to 15 inches, mean annual air temperature ranges from 480 to 500 F, and the frost -free season ranges from 135 to 150 days. In a representative profile the surface layer is light olive brown clay loam about 4 inches thick. The sub - 36 SOIL SURVEY beets. Under dryland management it is well suited to pasture or native grasses and, to a lesser extent, wheat and barley. Capability units IIIe-5, irrigated, and IVe-5, dryland; Loamy Plains range site; windbreak suitability group 2. 62—Larimer-Stoneham complex, 3 to 10 percent slopes. This complex consists of gently sloping to strongly sloping soils on terraces, fans, and benches. It is about 35 percent Larimer fine sandy loam, about 25 percent Stoneham loam, and about 20 percent Cushman fine sandy loam. Larimer fine sandy loam is on side slopes and areas near terrace edges, Stoneham loam commonly has the more gentle slopes on terraces, and Cushman fine sandy loam is on side slopes. Included with these soils in mapping are about 20 percent areas of Fort Collins, Larim, Altvan, and Satanta soils. Also included are some small areas of soils that are more sloping. Runoff is medium to rapid, and the hazard of erosion is moderatko severe. This soil is well suited to pasture and native grasses under dryland management. If irrigated, it is suited to pasture and, to a lesser extent, barley, wheat, and alfalfa. Capability units IVe-1, irrigated, and VIe-2, dryland; Loamy Plains range site; windbreak suit- ability group 2. Longmont Series The Longmont series consists of deep, poorly drained soils that formed in alluvium mainly from clay shale. These soils are on flood plains, terraces, and valleys. Elevation ranges from 4,800 to 5,800 feet. Slopes are 0 to 3 percent. The native vegetation is mainly alkali sacaton, saltgrass, sedges, and other water -tolerant grasses. Mean annual precipitation ranges from 13 to 15 inches, mean annual air tempera- ture ranges from 480 to 500 F, and the frost -free sea- son ranges from 135 to 150 days. In a representative profile the surface layer is light brownish gray clay about 17 inches thick. The under- lying material is mottled pale olive clay. Permeability is slow, and the available water ca- pacity is high. Reaction is strongly alkaline above a depth of 40 inches and moderately alkaline below that depth. These soils are used for native grasses. Representative profile of Longmont clay, 0 to 3 per- cent slopes, in native grass, about 1,350 feet east and 50 feet north of the southwest corner of sec. 17, T. 6 N., R. 68 W.: A11-0 to 7 inches; light brownish gray (2.5Y 6/2) clay, dark grayish brown (2.5Y 4/2) moist; weak medium subangular blocky structure; hard, very firm; strongly effervescent; strongly alkaline; clear smooth boundary. Al2-7 to 17 inches; light brownish gray (2.5Y 6/2) clay, dark grayish brown (2.5Y 4/2) moist; weak coarse subangular blocky structure; very hard, very firm; strongly effervescent; strongly alkaline; gradual wavy boundary. Clcscag-17 to 40 inches; pale olive (5Y 6/3) clay, olive (5Y 4/3) moist; massive; very hard, very firm; common medium distinct mottles of yellowish brown (10 YR 5/6) moist; calcium sulfate ac- cumulations in seams and streaks and calcium carbonate in spots; strongly effervescent; strongly alkaline; gradual wavy boundary. C2cscag-40 to 60 inches; pale olive (5Y 6/3) clay, olive (5Y 5/3) moist; massive; very hard, very firm; common medium distinct mottles of olive (5Y 4/3 and 4/4) moist; calcium sulfate accumula- tions in seams and streaks and calcium carbonate in spots; strongly efferves- cent; moderately alkaline. The A horizon is clay loam or clay 12 to 21 inches thick. The C horizon is heavy clay loam or clay. Reac- tion is strongly alkaline or very strongly alkaline in the surface layer but decreases with increasing depth. The water table is near the surface for part of every year. 63—Longmont clay, 0 to 3 percent slopes. This nearly level soil is on flood plains and upland valleys. Included with this soil in mapping are some small areas of soils that are more sloping and a few small areas of soils that have a surface layer and subsurface layer of clay loam. Also included are a few small areas of soils in which gravel is at a depth of 40 to 60 inches. Runoff is slow, and the hazard of erosion is slight. This soil is suited to pasture or native grasses (fig. 9). Capability unit VIw-2, dryland; Salt Meadow range site; windbreak suitability group 4. Loveland Series The Loveland series consists of deep, somewhat poorly drained soils that formed in material weathered from alluvium. These soils are on terraces and flood plains and are underlain by sand and gravel,at a depth of 20 to 40 inches. Elevation ranges from 4,800 to 5,500 feet. Slopes are 0 to 1 percent. The native vegeta- tion is mainly blue grama, bluegrass, and sedges. Mean annual precipitation ranges from 13 to 15 inches, mean annual air temperature ranges from 480 to 500 F, and the frost -free season ranges from 135 to 150 days. In a representative profile the surface layer is mot- tled dark grayish brown or grayish brown clay loam about 15 inches thick. The underlying material is 17 inches of grayish brown clay loam over sand, gravel, and cobbles. Permeability is moderately slow above a depth of about 32 inches and very rapid below that depth. The available water capacity is medium to high. Reaction is mildly alkaline above a depth of about 8 inches and moderately alkaline below that depth. These soils are used mainly for irrigated and dry - farmed crops and for pasture. Representative profile of Loveland clay loam, 0 to 1 percent slopes, in grass, 2,250 feet north and 600 feet west of the southeast corner of sec. 10, T. 6 N., R. 68 W.: A11-0 to 8 inches; dark grayish brown (10YR 4/2) clay loam, very dark brown (10YR 2/2) moist; weak to moderate fine gran- , AC �•� 108 53 35 53 =' - _. '.-1 � i r � / L K -. � � 54 L.'•. a� �.;, = . 108 � }'•,-'. •- ..,,. �� i � �@r r �O r a$•, �S.y 73 101 �t,.Lf..� o .:k • . � 9 �..... 74 ,` r.- ., 4 � _, 22�i, i7 -.,_ "+7 ,. �iE3 • _ tip �, �_ "'`� - 47�,2?A- 73 ° $ 105 35 64 22 7-7 �• M `C.h j CAN y 64 - E,� ° 34 +5 -..— � 1 � `. ^�,WZ�OS .'a .. - '^ - ,.. � -,C LDRA00 1 ANO •— _ SOfITHEAF! 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