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Home My WebLink About970994.tiff fUL „I -• fD Z� U. S. EPARTMENT OF AGRICULTURE SOIL CONSERVATION SERVICE �, c D( ( D< < � 6 D z 2.5..O.0.0:::::77::,::,,,::::. 65 W. I R. 64 W. z4 ° ll, w �n �,v°C° ' y.�4` 4''h ?'4 F2 "'ABM ' ✓r''y . � ! 'A Gm Tc m # a I tl t"....-..:.;.,:;.'".. ,&,`eta ;..,:,;a, -4 ::• ¢C"a», �y ....:::.,,.4!::,.:?:,...!., f Y ::* 6 i k ₹ /" fie, ::;1;7;6:::::,:-...v,44........,.......o 1r44.611.° 'R. :S y''0,:. ',74r1,4,-, * S" C � p • t ��a� 4 �£y N ''�T�i} y v «# "R`N Ma'i1 b ry 'y"h :, .4:diJC' '5° ; "+ j E r �atx p • o uat,"•;•,. r„..,,,• 7 ' ".4.... x•r �•a I, ..u.44 r " •'.�. ; a k,iT . : r" # v n f `5g § . ^ ty 7"w.�' ' ' C �C4 '•& y 4 ry ^€A m' �'� *°v :r t « • a lis a .1 .§ tai^ vi ,'. �» ,tots ry Fy. I w3 p; rC;eFi F. • .. .r t''''''''.1/4H.2 't C�„ ii 1 •4 t ' +^. £.'• ..,l"y, 69 �y 4o ..K 39^ FE a. M t yrr,a ✓"� to a •7414 " 39 .y toots.,so,�•'.,. � gyp, "n 4 �_ .:r 4.!4411 I ° C f " 4 o • � "3r r& , • 6� .`� #;.,.+ ' , p ''µ 47,•". i trOO y sa i>'` • ` x'w` w 'i R 5 � '"^ 'R• a, J '',4 ' v' ':"ra^d . .;�C�: • a #`Ry'r',E,a^"w°� r a;:, � '°s."�P r ' w e ♦Ltico)3CJ ti '�f . • •r`At••, 970994 ':.xm .r r � 1''\: . .l \ 1 1 NONTECHNICAL SOILS DESCRIPTION REPORT Soils Report for weld County Planning Dept. Map Soil name and description Symbol 10 Bankard sandy loam, 0 to 3 percent slopes The Bankard soil is a deep, somewhat excessively drained soil. It is formed on floodplains from stratified recent alluvium. The surface is a sandy loam. The underlying material is a calcareous sand stratified with thin Lenses of sandy loam, loam, and fine gravel. The soils have moderately rapid permeability. Their available water holding capacity is low. Roots penetrate to 60 inches or more. Runoff is slow and the erosion hazard due to wind is severe. 18 Colby-Adena loans, 3 to 9 percent slopes These gently sloping to moderately sloping soils are on plains, hills and ridges at elevations of 4,750 to 4,900 ft. The Colby soil makes up about 55% of the mapunit, and occupies the steeper convex parts of the landscape. The Adena soil makes up about 30% of the unit, and occupies the Less steep slightly concave parts of the Landscape. About 15% of the mapunit are Kim and Weld Loans.. The Colby soil is deep and well drained. The surface is pale brown loam about 7 in's thick, and the underlying material to a depth of 60 in's is very pale brown silt loam. Permeability is moderate, and available water capacity is high. Surface runoff is high and the water erosion hazard is high. The Adena soil is also deep and well drained. Typically the surface layer is brown loam about 6 in's thick. The subsoil is a brown to very brown clay loam about 3 in's thick, and the substratum to a depth of 60 in's is a very pale brown silt loam. Permeability is slow, and available water holding capacity is high. Surface runoff is medium, and the water erosion hazard is moderate. 47 Olney fine sandy loam, 1 to 3 percent slopes 9'70994 NONTECHNICAL SOILS DESCRIPTION REPORT Soils Report for Weld County Planning Dept. Map Soil name and description Symbol The Olney soil is a deep, well drained soil. It is formed on smooth plains in mixed outwash deposits. The surface is a fine sandy loam. The subsoil is sandy clay loam. The underlying material is a calcareous fine sandy loam. The soils have moderate permeability. Their available water holding capacity is moderate. Roots penetrate to 60 inches or more. Runoff is slow and the erosion hazard due to wind is severe. 74 Vona loamy sand, 5 to 9 percent slopes The Vona soiL is a deep, somewhat excessively drained soil. It is formed on plains and high terraces in eolian or alluvial deposits. The surface is a fine sandy loam, as is the subsoil. The underlying material is a sandy loam. The soils have moderately rapid permeability. Their available water holding capacity is moderate. Roots penetrate to 60 inches or more. Runoff is slow and the erosion hazard due to wind is high. 970"01 U.S. DEPARTMENT OF AGRICULTURE PAGE 1 OF 2 NATURAL RESOURCES CONSERVATION SERVICE 02/5/97 BUILDING SITE DEVELOPMENT Soils Report for Weld County Planning Dept. (The information in this report indicates the dominant soil condition but does not eliminate the need for onsite investigation) Map symbol Shallow Dwellings Dwellings SmaLL Local roads Lawns and and soil name excavations without with commercial and streets landscaping basements basements buildings 10: Bankard Severe: Severe: Severe: Severe: Moderate: Moderate: cutbanks cave flooding flooding flooding flooding droughty 18: Colby Slight Slight Slight Moderate: Moderate: Slight slope low strength Adena Slight Slight Slight Moderate: Slight Slight slope 47: Olney Severe: Slight Slight Slight Slight Slight cutbanks cave 74: Vona Severe: Slight Slight Moderate: Slight Moderate: cutbanks cave slope droughty 970,94 U.S. DEPARTMENT OF AGRICULTURE PAGE 2 OF 2 NATURAL RESOURCES CONSERVATION SERVICE 02/5/97 BUILDING SITE DEVELOPMENT Endnote -- BUILDING SITE DEVELOPMENT This report shows the degree and kind of soil limitations that affect shallow excavations, dwellings with and without basements, small commercial buildings, local roads and streets, and lawns and landscaping. The limitations are "Slight", "Moderate", or "Severe". The limitations are considered "Slight" if soil properties and site features are generally favorable for the indicated use and limitaions are minor and easily overcome; "Moderate" if soil properties or site features are not favorable for the indicated use and special planning, design, or maintenance is needed to overcome or minimize the limitations; and "Severe" if soil properties or site features are so unfavorable or so difficult to overcome that special design, significant increases in construction costs, and possibly increased maintenance are required. Special feasibility studies may be required where the soil limitations are severe. SHALLOW EXCAVATIONS are trenches or holes dug to a maximum depth of 5 or 6 feet for basements, graves, utility Lines, open ditches, and other purposes. The ratings are based on soil properties, site features, and observed performance of the soils. The ease of digging, filling, and compacting is affected by the depth to bedrock, a cemented pan, or a very firm dense layer; stone content; soil texture; and slope. The time of the year that excavations can be made is affected by the depth to a seasonal high water table and the susceptibility of the soil to flooding. The resistance of the excavation walls or bands to sloughing or caving is affected by soil texture and the depth to the water table. DWELLINGS AND SMALL COMMERCIAL BUILDINGS are structures built on shallow foundations on undisturbed soil. The load limit is the same as that for single-family dwellings no higher than three stories. Ratings are made for small commercial buildings without basements, for dwellings with basements, and for dwellings without basements. The ratings are based on soil properties, site features, and observed performance of the soils. A high water table, depth to bedrock or to a cemented pan, large stones, slope, and flooding affect the ease of excavation and construction. Landscaping and grading that require cuts and fills of more than 5 or 6 feet are not considered. LOCAL ROADS AND STREETS have an all-weather surface and carry automobile and light truck traffic all year. They have a subgrade of cut or fill soil material, a base of gravel, crushed rock, or stabilized soil material, and a flexible or rigid surface. Cuts and fills are generally properties, site features, and observed performance of the soils. Depth to bedrock or to a cemented pan, a high water table, flooding, large stones, and slope affect the ease of excavating and grading. Soil strength (as inferred from the engineering classification of the soil), shrink-swell potential, frost action potential, and depth to a high water table affect the traffic-supporting capacity. LAWNS AND LANDSCAPING require soils on which turf and ornamental trees and shrubs can be established and maintained. The ratings are based on soil properties, site features, and observed performance of the soils. Soil reaction, a high water table, depth to bedrock or to a cemented pan, the available water capacity in the upper 40 inches, and the content of salts, sodium, and sulfidic materials affect plant growth. Flooding, wetness, slope, stoniness, and the amount of sand, clay, or organic matter in the surface layer affect trafficability after vegetation is established. 970.,. ,.;gei 4 U•S. DEPARTMENT OF AGRICULTURE PAGE 1 OF 2 NATURAL RESOURCES CONSERVATION SERVICE 02/5/97 SOIL FEATURES Soils Report for Weld County Planning Dept. Bedrock Cemented pan Subsidence Risk of corrosion Potential Map symbol frost action Uncoated and soil name Depth Hardness Depth Kind Initial Total steel Concrete In In In In 10: Bankard >60 --- --- --- --- --- Low Moderate Low 18: Colby >60 --- --- --- --- --- Low Low Low Adena >60 --- --- --- --- --- Low High Low 47: Olney >60 --- --- --- --- --- Low High Low 74: Vona >60 --- --- --- --- --- Low High Low 970,n9 le U.S. DEPARTMENT OF AGRICULTURE PAGE 2 OF 2 NATURAL RESOURCES CONSERVATION SERVICE 02/5/97 SOIL FEATURES Endnote -- SOIL FEATURES This report gives estimates of various soil features. The estimates are used in Land use planning that involves engineering considerations. Depth to bedrock is given if bedrock is within a depth of 5 feet. The depth is based on many soil borings and on observations during soil mapping. The rock is either "Soft" or "Hard". If the rock is "Soft" or fractured, excavations can be made with trenching machines, backhoes, or small rippers. If the rock is "Hard" or massive, blasting or special equipment generally is needed for excavation. Cemented pans are cemented or indurated subsurface layers within a depth of 5 feet. Such pans cause difficulty in excavation. Pans are classified as "Thin" or "Thick". A "Thin" pan is less than 3 inches thick if continuously indurated or less than 18 inches thick if discontinuous or fractured. Excavations can be made by trenching machines, backhoes, or small rippers. A "Thick" pan is more than 3 inches thick if continuously indurated or more than 18 inches thick if discontinuous or fractured. Such a pan is so thick or massive that blasting or special equipment is needed in excavation. Subsidence is the settlement of organic soils or of saturated mineral soils of very low density. Subsidence results from either desiccation and shrinkage or oxidation of organic material, or both, following drainage. Subsidence takes place gradually, usually over a period of several years. This report shows the expected initial subsidence, which usually is a result of drainage, and total subsidence, which usually is a result of oxidation. Not shown in the report is subsidence caused by an imposed surface load or by the withdrawal of ground water throughout an extensive area as a result of lowering the water table. Potential frost action is the likelihood of upward or lateral expansion of the soil caused by the formation of segregated ice lenses (frost heave) and the subsequent collapse of the soil and loss of strength on thawing. Frost action occurs when moisture moves into the freezing zone of the soil. Temperature, texture, density, permeability, content of organic matter, and depth to the water table are the most important factors considered in evaluating the potential for frost action. It is assumed that the soil is not insulated by vegetation or snow and is not artificially drained. Silty and highly structured clayey soils that have a high water table in winter are the most susceptible to frost action. Well drained, very gravelly, or very sandy soils are the least susceptible. Frost heave and low soil strength during thawing cause damage mainly to pavements and other rigid structures. Risk of corrosion pertains to potential soil-induced electrochemical or chemical action that dissolves or weakens uncoated steel or concrete. The rate of corrosion of uncoated steel is related to such factors as soil moisture, particle-size distribution, acidity, and electrical conductivity of the soil. The rate of corrosion of concrete is based mainly on the sulfate and sodium content, texture, moisture content, and acidity of the soil. Special site examination and design may be needed if the combination of factors creates a severe corrosion environment. The steel installations that intersect soil boundaries or soil layers is more susceptible to corrosion than steel in installations that are entirely within one kind of soil or within one soil layer. For uncoated steel, the risk of corrosion, expressed as "Low", "Moderate", or "High", is based on soil drainage class, total acidity, electrical resistivity near field capacity, and electrical conductivity of the saturation extract. For concrete, the risk of corrosion is also expressed as "Low", "Moderate", or "High". It is based on soil texture, acidity, and amount of sulfates in the saturation extract. 970%)4 Hello