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Home My WebLink AboutUNIVERSITY CENTER PUD (UNIVERSITY MALL REDEVELOPMENT) - PRELIMINARY - 2-96 - SUBMITTAL DOCUMENTS - ROUND 1 - GEOTECHNICAL (SOILS) REPORT0 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, 1 to 3 percent slopes. This nearly level somewhat poorly drained soil is on low terraces and alluvial fans, commonly adjacent to drainageNvays. 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. USDA SOIL CONSERVATION SERVICE SOIL GROUP DESCRIPTION NUNN SERIES Earth Engineering Consultants 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 Nvheatgrasses. 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. 6S 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 4/ 3) moist; moderate medium and coarse prismat.c 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 pa -thy 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, stic:;y 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 inc'iided are a few small areas of Satanta, Fort Collins, and U hn soils and a fey 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, 'cheat, 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 elopes. 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 ivind 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). USDA SOIL CONSERVATION SERVICE SOIL GROUP DESCRIPTION NUNN SERIES Earth Engineering Consultants 7� C A/ 6r 7b 73 — Nu,v,v SERits SOIL CONSERVATION SERVICE -SOIL GROUPING SCHEMATIC UNIVERSITY MALL FORT COLLINS, COLORADO JANUARY 1996 PROJECT No: 1962007 Earth Engineering Consultants REFERENCES 1. Colton R.B. and Harold R. Fitch, 1974, Map Showing Potential Sources of Gravel and Crushed -Rock Aggregate. in the Boulder -Fort Collins -Greeley Area, Front Range Urban Corridor. Colorado: U.S. Geological Survey Miscellaneous Investigation Series Map I-855-D. 2. Colton R.B., Holligan, J.A., and Anderson, L.W., 1975, Preliminary Map of Landslide Deposits, Greeley 1 °x2° Quadrangle. Colorado: U.S. Geological Survey Miscellaneous Investigation Series Map MF-704. 3. McCain, J. and Hotchkiss, W.R., 1975, Map Showing Flood -Prone Areas, Boulder -Fort Collins -Greeley Area, Front Range Urban Corridor. Colorado: U.S. Geological Survey Miscellaneous Investigation Series Map I-855-E. 4. Colton R.B., 1978, Geologic Map of the Boulder -Fort Collins -Greeley Area, Colorado: U.S. Geological Survey Miscellaneous Investigation Series Map I955-G. 5. Hershey L.A. and Schneider, Jr. P.A., 1972, Geologic Map of the Lower Cache La Poudre River Basin, North-Central Colorado: U.S. Geological Survey Miscellaneous Investigation Series Map I-687. 6. Hillier D. and Schneider, Jr. P.A., 1979, Depth to the Water Table in the Boulder - Fort Collins -Greeley Area. Front Range Urban Corridor, Colorado: U.S. Geological Survey Miscellaneous Investigation Series Map I-855-I. 7. United States Department of Agriculture Soil Conservation Service and Forest Service in Cooperation with Colorado Agricultural Experiment Station, 1980, Soil Survey of Latimer County Area. Colorado, Maps 239-812/3. Earth Engineering Consultants, Inc. ZTI Development Group January 19, 1996 Page 3 We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the above or enclosed information, or if we can be of further service to you in any other way, please do not hesitate to contact us. Very truly yours, Earth Engineering Consultants, Inc. Lester L. Litton, P.E. Principal Engineer LLL/dmf Earth Engineering Consultants, Inc. ZTI Development Group January 19, 1996 Page 2 lean clays underlain by higher plasticity (CUCH) materials. The SCS information indicates the depth to the groundwater table would be anticipated to be greater than 6 feet and the depth to bedrock greater than 5 feet. SCS information also indicates the site would not be expected to be prone to flooding. CGS information on the site indicates the depth to the water table would generally be expected to be on the order of 10 to 20 feet. The site is located in the Pleistocene Age Slocum Alluvium which consists of undifferentiated piedmont and fans deposits. CGS information indicates the property is not within a known flood zone and no active landslides are known to exist in the immediate proximity. Based on the physiographic review we completed as outlined above, it is our opinion the proposed site could be used for lightly loaded commercial and residential structures. Heavier loaded foundations may require the foundations extend to bedrock or the use of alternative foundation types. A geotechnical exploration of the site should be completed to better define foundation types appropriate for the site materials. It appears as though the near surface soils could also be used for direct support of floor slabs and pavements although special care and construction procedures may be necessary with the CUCH materials indicated in the Nunn series. Those materials may show a tendency to change volume with variation in moisture content. Based on existing construction observed in the general vicinity, it is our opinion those construction procedure modifications would not be extensive. The physiographic evaluation completed for this project was based on a review of the outlined public information readily available for the site. The conditions indicated by this information may or may not actually exist on the site and we recommend geotechnical exploration be completed prior to design and construction of the proposed improvements. January 19, 1996 ZTI Development Group 1220 South College Avenue Suite 200 Fort Collins, Colorado 80524 Attn: Mr. Ed Zdenek Re: Physiographic Site Evaluation University Mall Fort Collins, Colorado EEC Project No. 1962007 Mr. Zdenek: EEC EARTH ENGINEERING CONSULTANTS, INC. As you requested, Earth Engineering Consultants, Inc. has completed a physiographic evaluation for the referenced project. The physiographic evaluation was completed by reviewing readily available information concerning anticipated soil and ground water conditions at the site. The information reviewed consisted primarily of Soil Conservation Service (SC'S) information for Larimer County and the United States Geologic Survey/Colorado Geologic Society (CGS) published maps concerning the geologic features in the area. A list of the references reviewed as a part of this evaluation are included in the appendix of this report. The University Mall property is located in the southwest quarter of Section 23, Township 7 North, Range 69 West of the 6th Principal Meridian in the City of Fort Collins, Larimer County, Colorado. This site is generally located on the west side of College Avenue, south of Prospect. The approximate location of the site is indicated on the attached site diagram. That diagram also indicates the soil types expected at the site as indicated by the Soil Conversation Service Soil Survey of Larimer County. A description of the SCS soil series anticipated on this site is included in the appendix. The only soil type anticipated on the referenced property is the Nunn series which consists of low plasticity Centre For Advanced Technology 2301 Research Boulevard, Suite 104 Fort Collins, CO 80526 (970)224-1522 FAX 224-4564