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Home My WebLink About992743.tiff U.S. DEDARTMENT OF AGRICULTURE PAGE 1 OF 3 NATURAL RESOURCES CONSERVATION SERVICE 07/15/99 SANITARY FACILITIES Healy (The information in this report indicates the dominant soil condition but does not eliminate the need for onsite investigation) Map symbol Septic tank Sewage lagoon Trench Area Daily cover and soil name absorption areas sanitary sanitary for landfill fields landfill landfill 72: Vona Severe: Severe: Moderate: Slight Fair: poor filter seepage too sandy , too sandy /'\ • 992743 U.S. DEPARTMENT CF AGRICULTURE PAGE 2 CF 3 NATURAL RESOURCES CONSERVATION SERVICE 07/15/99 SANITARY FACILITIES Endnote -- SANITARY FACILITIES This report shows the degree and kind of soil limitations that affect septic tank absorption fields, sewage lagoons, and sanitary landfills. The limitations are considered "Slight" if soil properties and site features generally are favorable for the indicated use and limitations 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. This report also shows the suitability of the soils for use as daily cover for landfills. A rating of "Good" indicates that soil properties and site features are favorable for the use and good performance and low maintenance can be expected; "Fair" indicates that soil properties and site features are moderately favorable for the use and one or more soil properties or site features make the soil less desirable than the soils rated "Good"; and "Poor" indicates that one or more soil properties or site features are unfavorable for the use and overcoming the unfavorable properties requires special design, extra maintenance, or costly alteration. SEPTIC TANK ABSORPTION FIELDS are areas in which effluent from a septic tank is distributed into the soil through subsurface tiles cr perforated pipe. Only that part of the soil between depths of 24 to 72 inches is evaluated. The ratings are base on soil properties, site features, and observed performance of the soils. Permeability, a high water table, depth to bedrock or to a cemented pan, and flooding affect absorption of the effluent. Large stones and bedrock or a cemented pan interfere with installation. Unsatisfactory performance of septic tank absorption fields, including excessively slew absorption of effluent, surfacing of effluent, and hillside seepage, can affect public health. Groundwater can be polluted if highly permeable sand and gravel or fractured bedrock is less than 4 feet below the base of the absorption field, if slope is excessive, or if the water table is near the surface. There must be unsaturated soil material beneath the absorption field to filter the effluent effectively. Many local ordinances require that this material be of a certain thickness. SEWAGE LAGOONS are shallow ponds constructed to hold sewage while aerobic bacteria decompose the solid and liquid wastes. Lagoons should have a nearly level floor surrounded by cut slopes or embankments of compacted soil. Lagoons generally are designed to hold the sewage within a depth of 2 to 5 feet. Nearly impervious soil material for the lagoon floor and sides is required to minimize seepage and contamination of ground water. This report gives ratings for the natural soil that makes up the lagoon floor. The surface layer and, generally, 1 or 2 feet of soil material below the eerface layer are excavated to provide material for the embankments. The ratings are based on soil properties, site features, and observed performance of the soils. Considered in the ratings are slope, permeability, a high water table, depth to bedrock or to a cemented pan, flooding, large stones, and content of organic matter. Excessive seepage due to rapid permeability of the soil or a water table that is high enough to raise the level of sewage in the lagoon causes a lagoon to functior unsatisfactorily. Pollution results if seepage is excessive or if floodwater overtop, the lagoon. A high content of organic matter is detrimental to proper functioning of the lagoon because it inhibits aerobic activity. Slope, bedrock, and cemented pans can cause construction problems, and large stones can. hinder compaction of the lagoon floor. SANITARY LANDFILLS are areas where solid waste is disposed of by burying it in soil. There are two types of landfill, trench and area. In a trench landfill, the waste is placed in a trench. It is spread, compacted, and covered daily with a thin layer of soil excavated at the site. In an area landfill, the waste is placed in successive layers on the surface of the soil. The waste is spread, compacted, and covered daily with a thin layer of soil form a source away from the site. Both types of landfill must be able to bear heavy vehicular traffic. Both types involve a risk of groundwater pollution. Ease of excavation and revegetation need to be considered. The ratings in this report are based U.S. DE"P.RTMENT Of AGRICULT1E PAGE 3 OF 3 NATURAL RESOURCES CC$SERVATION SERVICE 07/15/99 SANITARY FACILITIES Endnote -- SANITARY FACILITIES--Continued on soil properties, site features, and observed performance of the soils. Permeability, depth to bedrock or to a cemented pan, a high water table, slope, and flooding affect both types of landfill. Texture, stones and boulders, highly organic layers, soil reaction, and content of salts and sodium affect trench type landfills. Unless otherwise stated, the ratings apply only to that part of the soil within a depth of about 6 feet. For deeper trenches, a limitation rate "Slight" or "Moderate' may not be valid. Onsite investigation is needed. DAILY COVER FOR LANDFILL is the soil material that is used to cover compacted solid waste in an area type sanitary landfill. The soil material is obtained offsite, transported to the landfill, and spread over the waste. Soil texture, wetness, coarse fragments, and slope affect the ease of removing and spreading the material during wet and dry periods. Loamy or silty soils that are free of large stones or excess gravel are the best cover for a landfill. Clayey soils may be sticky or cloddy and are difficult to spread; sandy soils are subject to soil blowing. After soil material has been removed, the soil material remaining in the borrow area must be thick enough over bedrock, a cemented pan, or the water table to permit revegetation. The soil material used as final cover for a landfill should be suitable for plants. The surface layer generally has the best workability, more organic matter than the rest of the profile, and the best potential for plants. Material from the surface layer should be stockpiled for use as the final cover. J._. 7W7y:`4T `^ PACE _ Or 2 NATURAL RESOURCES CONSERVATION S . SCE 07/15/99 T BUILDING SITE DEVELOPMENT Healy (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 72: Vona Severe: Slight Slight Slight Slight Moderate: cutbanks cave droughty T T NATURAL RESOURCES CONSERVATION SE .: S1j15/9? BUILDING SITE DEVELOPMENT ri 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 cf the soil to flooding. The resistance of the exca°vation 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 IT\ have a subgrade of cut or fill soil material, a base of gravel, crushed rock, or stabilized sail 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 ANC 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. T • 46 SOIL SURVEY Permeability is rapid. Available water capacity is yellowish brown fine sandy loam about 16 inches thick. moderate. A water table is at or near the surface in The substratum to a depth of 60 inches is sandy loam. spring and about 36 inches below the surface in fall. Sur- Permeability is moderately rapid. Available water face runoff is slow, and the erosion hazard is low. capacity is moderate. The effective rooting depth is 60 This unit is used for rangeland and wildlife habitat. The inches or more. Surface runoff is slow, and the erosion potential native vegetation on the Valent soil is hazard is low. dominated by sand reedgrass, sand bluestem, blue and In irrigated areas this soil is suited to the crops com- hairy grams, little bluestem, needleandthread, and monly grown in the area. Perennial grasses and alfalfa or sideoats grama. Potential production ranges from 1,800 close grown crops should be grown at least 50 percent of pounds per acre in favorable years to 1,400 pounds in un- the time. Contour ditches and corrugations can be used in favorable years. As range condition deteriorates, the sand irrigating close grown crops and pasture. Furrows, con- bluestem, sand reedgrass, sideoats grama, and little tour furrows, and cross slope furrows are suitable for row bluestem decrease; sandhill muhly and blowout grass in- crops. Sprinkler irrigation is also desirable. Keeping til- crease, and forage production drops. "Blowouts" occur as lage to a minimum and utilizing crop residue help to con- range condition becomes poorer. trol erosion. Maintaining fertility is important. Crops The native vegetation on the Loup soil is dominated by respond to applications of phosphorus and nitrogen. switchgrass, little bluestem, sand reedgrass, and western In nonirrigated areas this soil is suited to winter wheat, wheatgrass. Indiangrass, sand bluestem, prairie cordgrass, barley, and sorghum. Most of the acreage is planted to slender wheatgrass, alkali sacaton, saltgrass, sedge, and winter wheat. The predicted average yield is 20 bushels rush are also present. Potential production ranges from per acre. The soil is summer fallowed in alternate years 4.000 pounds per acre in favorable years to 3,000 pounds to allow moisture accumulation. Generally precipitation is in unfavorable years. As range condition deteriorates, the too low for beneficial use of fertilizer. switchgrass, sand bluestem, indiangrass, little bluestem, Stubble mulch farming, striperopping, and minimum til- and prairie cordgrass decrease, and saltgrass, blue grams, lage are needed to control soil blowing and water erosion. sand dropseed, sedge, and rush increase. Undesirable Terracing lso native be vegetation may to control twater erosion. is weeds and annuals invade the site as range condition Thedominated pgta by sand bluestem, sand reedgrass, and blue becomes poorer. Seeding with an interseeder is advisable if the range is grama. Needleandthread, switchgrass, sideoats grams, in poor condition. Sand reedgrass, sand bluestem, sideoats and western wheatgrass are also prominent. Potential grama, switchgrass, little bluestem, indiangrass, and blue production ranges from 2,200 pounds per acre in favora- grama are suitable for seeding. Seeding early in spring ble years to 1,800 pounds in unfavorable years. As range has proven most successful. Grazing should be light to condition deteriorates, the sand bluestem, sand reedgrass, prevent range deterioration. and switchgrass decrease and blue grama, sand dropseed, Wildlife is an important secondary use of this unit. On and sand sage increase. Annual weeds and grasses invade the Valent soil, rangeland wildlife, for example, the the site as range condition becomes poorer. pronghorn antelope, can be attracted by developing Management of vegetation on this soil should be based livestock watering facilities, managing livestock grazing, on taking half and leaving half of the total annual produc- and reseeding where needed. tion. Seeding is desirable if the range is in poor condition. The Loup soil, which is typically wet and produces an Sand bluestem, sand reedgrass,ss,switchgrass,rass, sideoats crested abundance of wetland vegetation, attracts wetland wil- grama, blue grama, pubescent dlife species, such as mallard, teal, geese, and miscellane- wheatgrass are suitable for seeding. The grass selected ous shorebirds. Primary management of this soil for wet- should meet the seasonal requirements of livestock. It land wildlife includes managing livestock grazing, fencing should be drilled into a clean, firm sorghum stubble or a to control livestock, protecting from fire, and preventing prepared seedbed. Seeding early in spring has proven drainage. Natural wetland vegetation should be allowed m Winucceaks and environmental plantings are fairly well to develop. Capability subclass V Ie irrigated, VIe nonir- Windbreaks and environmental plantings are fairly well rigated; Valent soil in Choppy Sand Meadow range site, suited to this soil. Blowing sand and low available water Loup soil in Sandy Meadow range site. capacity are the principal hazards in establishing trees 72—Vona loamy sand, 0 to 3 percent slopes. This is a and shrubs. The soil is so loose that trees should be deep, somewhat excessively drained soil on plains and planted in shallow furrows and vegetation maintained high terraces at elevations of 4,600 to 5,200 feet. It between the rows. Supplemental irrigation is needed to formed in eolian or alluvial deposits. Included in mapping insure survival. Trees that are best suited and have good are some leveled areas. Also included are small areas of survival are Rocky Mountain juniper, eastern redcedar, soils that have a loamy substratum and some areas of ponderosa pine, and Siberian elm. The shrubs best suited soils that are noncalcareous ay a depth of 60 inches. are skunkbush sumac, lilac, and Siberian peashrub. Typically the surface layer of this Vona soil is grayish Wildlife is an important secondary use of this soil. The brown. The upper 6 inches is loamy sand and the lower 6 cropland areas provide favorable habitat for ring-necked inches is fine sandy loam. The subsoil is brown and light pheasant and mourning dove. Many nongame species can WELD COUNTY, COLORADO, SOUTHERN PART 47 be attracted by establishing areas for nesting and escape wheatgrass are suitable for seeding. The grass selected ver. For pheasants, undisturbed nesting cover is essen- should meet the seasonal requirements of livestock. It can -,al and should be included in plans for habitat develop- be seeded into a clean, firm sorghum stubble, or it can be ment, especially in areas of intensive agriculture. Range- drilled into a firm prepared seedbed. Seeding early in land wildlife, for example, the pronghorn antelope, can be spring has proven most successful. attracted by developing livestock watering facilities, Windbreaks and environmental plantings are fairly well managing livestock grazing, and reseeding where needed. suited to this soil. Blowing sand and low available water This soil has good potential for urban and recreational capacity are the principal hazards in establishing trees development. Once established, the lawns, shrubs, and and shrubs. The soil is so loose that trees should be trees grow well. The chief limiting soil feature is the planted in shallow furrows and vegetation maintained rapid permeability in the substratum, which causes a between the rows. Supplemental irrigation may be needed hazard of ground water contamination from sewage to insure survival. Trees that are best suited and have lagoons. In places recreational development is limited by good survival are Rocky Mountain juniper, western the susceptibility to soil blowing. Capability subclass file redcedar, ponderosa pine, and Siberian elm. The shrubs irrigated, IVe nonirrigated; Sandy Plains range site. best suited are skunkbush sumac, lilac, and Siberian 73—Vona loamy sand, 3 to 5 percent slopes. This is a peashrub. Wildlife is an important secondary use of this soil. The deep, somewhat excessively drained soil on plains and high terraces at elevations of 4,600 to 5,200 feet. It cropland areas provide favorable habitat for ring-necked formed in eolian or alluvial deposits. Included in mapping pheasant and mourning dove. Many nongame species can be attracted by establishing areas for nesting and escape are some leveled areas. Also included are small areas of cover. For pheasants, undisturbed nesting cover is essen- soils that have a loamy substratum and some areas of tial and should be included in plans for habitat develop- soils that are noncalcareous to a depth of 60 inches. ment, especially in areas of intensive agriculture. Range- Typically the surface layer of this Vona soil is grayish land wildlife, for example, the pronghorn antelope, can be brown. The upper 6 inches is loamy sand and the lower 5 inches is fine sandy loam. The subsoil is brown and light attracted by developing livestock watering facilities, managing livestock grazing, and reseeding where needed. yellowish brown fine sandy loam about 14 inches thick. This soil has good potential for urban and recreational The substratum to a depth of 60 inches is sandy loam. development. Once established, the lawns, shrubs, and Permeability is moderately rapid. Available water trees grow well. The primary limiting soil feature is the capacity is moderate. The effective rooting depth is 60 ±es or more. Surface runoff is slow, and the erosion rapid permeability in the substratum, which causes a _tzar(' is low. hazard of ground water contamination from sewage in Intensive lagoons. In places recreational development is limited by This soil is suited to limited cro PP R' the susceptibility to soil blowing. Capability cropping is hazardous because of soil blowing. The P yP' y subclass IVe cropping system should be limited to such close grown irrigated, VIe nonirrigated; Sandy Plains range site. crops as alfalfa, wheat, and barley. The soil is also suited 74—Vona loamy sand, 5 to 9 percent slopes. This is a to irrigated pasture. A suitable cropping system is 3 to 4 deep,a somewhat sof excessively to5,200fedret. Itd soil on d plains at PP R y elevations of 4,600 to feet. formed in eolian years of alfalfa followed by 2 years of corn and small deposits. Included in grain and alfalfa seeded with a nurse crop. P mapping d are small areas of soils that non- Closely spaced contour ditches or sprinklers can be have a loamy substratum and areas of soils that are used in irrigating close calcareous to a depth of 60 inches. R R grown crops. Contour furrows or Typically the surface layer is grayish brown. The upper spinklers should be used for new crops. Application of 6 inches is loamy sand and the lower 4 inches is fine barnyard manure and commercial fertilizer helps to main- sandy loam. The subsoil is brown and light yellowish Cain good production. brown fine sandy loam about 12 inches thick. The sub- The potential native vegetation on this range site is stratum to a depth of 60 inches is loamy sand. dominated by sand bluestem, sand reedgrass, and blue Permeability is moderately rapid. Available water grama. Needleandthread, switchgrass, sideoats grama, capacity is moderate. The effective rooting depth is 60 and western wheatgrass are also prominent. Potential inches or more. Surface runoff is medium, and the erosion production ranges from 2,200 pounds per acre in favora- hazard is low. ble years to 1,900 pounds in unfavorable years. As range The potential native vegetation on this range site is condition deteriorates, the sand bluestem, sand reedgrass, dominated by sand bluestem, sand reedgrass, and blue and switchgrass decrease and blue grama, sand dropseed, grama. Needleandthread, switchgrass, sideoats grama, and sand sage increase. Annual weeds and grasses invade and western wheatgrass are also prominent. Potential the site as range condition becomes poorer. production ranges from 2,200 pounds per acre in favora- Management of vegetation on this soil should be based ble years to 1,800 pounds in unfavorable years. As range on taking half and leaving half of the total annual produc- condition deteriorates, the sand bluestem, sand reedgrass, tion. 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