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Home My WebLink About21053-Site & Soil Investigation Site & Soil Evaluation Deric J. Walter, PE #37110 Date: September 23, 2021 Figure 1:Soil Evaluation Figure 2:Soil Sample Figure 3:Plasticity Chart Figure 4:Profile Holes (View North) Figure 5:Profile Holes (View West) Figure 6:Profile Hole #1 Figure 7:Profile Hole #2 Figure 8:Profile Holes (View South) Figure 9:Building Structure & Septic Tank (far right side) Figure 10:Septic Tank Outlet Tee (Filter required) Figure 11:Septic Tank Info (photo rotated) Figure 12:Septic Tank Info Figure 13:Soil Profile (@ Topsoil Transition/Sandy Clay, photo rotated) Figure 14:Soil Profile (@ Sandy Clay/Silty Clay interface, photo rotated) Figure 15:Soil Profile (Smears/Texture-Calcium Carbonate) Figure 16:Soil Profile (Smears/Texture-Calcium Carbonate) 9/27/21, 3:57 PM Soil Texture Calculator | NRCS Soils https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/?cid=nrcs142p2_054167 1/2 United States Department of Agriculture About Us | Soil Survey Releases | National Centers | State Websites Browse By Audience | A-Z Index | Help You are Here: Home / Soil Survey / Soil Texture Calculator Soil Survey Soil Survey - Home Soil Surveys by State Partnerships Publications Soil Classification Soil Geography Tools Soil Survey Regional Offices Soil Climate Research Stations Soil Texture Calculator Use this online tool to calculate a single point texture class based on percent sand, silt, and clay. Including the optional sand fractions will refine the calculation. Or download a Microsoft Excel Macro-enabled spreadsheet to develop total sand, silt, and clay low, representative, and high values using an interactive texture triangle with textures that toggle on and off. Download Interactive Texture Triangle Excel Version (XLSM; 6.11 MB) Percent Sand: 5 *Very Coarse Sand: 0 *Coarse Sand: 0 *Medium Sand: 0 *Fine Sand: 0 *Very Fine Sand: 0 Percent Clay: 55 Graph Color: Red Get Type Reset Percent Silt: 40 Texture: Silty Clay Clear Graph *Optional NRCS Home | USDA.gov | Site Map | Civil Rights | FOIA | Plain Writing | Accessibility Statement Natural Resources Conservation Service Soils Topics Soil Survey Soil Health Contact Us Stay Connected Liquid Limit—Rifle Area, Colorado, Parts of Garfield and Mesa Counties (21053-Appleton OWTS) Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/27/2021 Page 1 of 34373490437354043735904373640437369043737404373790437384043734904373540437359043736404373690437374043737904373840287730287780287830287880287930287980 287730 287780 287830 287880 287930 287980 39° 29' 17'' N 107° 28' 6'' W39° 29' 17'' N107° 27' 54'' W39° 29' 4'' N 107° 28' 6'' W39° 29' 4'' N 107° 27' 54'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 0 50 100 200 300 Feet 0 25 50 100 150 Meters Map Scale: 1:1,950 if printed on A portrait (8.5" x 11") sheet. Soil Map may not be valid at this scale. Plasticity Index Map unit symbol Map unit name Rating (percent)Acres in AOI Percent of AOI 23 Detra fine sandy loam, 12 to 25 percent slopes 7.5 5.9 36.7% 39 Jerry loam, 12 to 50 percent slopes 20.0 10.2 63.3% Totals for Area of Interest 16.1 100.0% Description Plasticity index (PI) is one of the standard Atterberg limits used to indicate the plasticity characteristics of a soil. It is defined as the numerical difference between the liquid limit and plastic limit of the soil. It is the range of water content in which a soil exhibits the characteristics of a plastic solid. The plastic limit is the water content that corresponds to an arbitrary limit between the plastic and semisolid states of a soil. The liquid limit is the water content, on a percent by weight basis, of the soil (passing #40 sieve) at which the soil changes from a plastic to a liquid state. Soils that have a high plasticity index have a wide range of moisture content in which the soil performs as a plastic material. Highly and moderately plastic clays have large PI values. Plasticity index is used in classifying soils in the Unified and AASHTO classification systems. For each soil layer, this attribute is actually recorded as three separate values in the database. A low value and a high value indicate the range of this attribute for the soil component. A "representative" value indicates the expected value of this attribute for the component. For this soil property, only the representative value is used. Rating Options Units of Measure: percent Aggregation Method: Dominant Component Component Percent Cutoff: None Specified Tie-break Rule: Higher Interpret Nulls as Zero: No Layer Options (Horizon Aggregation Method): Depth Range (Weighted Average) Top Depth: 48 Bottom Depth: 84 Plasticity Index—Rifle Area, Colorado, Parts of Garfield and Mesa Counties 21053-Appleton OWTS Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/27/2021 Page 3 of 4 Liquid Limit Map unit symbol Map unit name Rating (percent)Acres in AOI Percent of AOI 23 Detra fine sandy loam, 12 to 25 percent slopes 27.5 5.9 36.7% 39 Jerry loam, 12 to 50 percent slopes 45.0 10.2 63.3% Totals for Area of Interest 16.1 100.0% Description Liquid limit (LL) is one of the standard Atterberg limits used to indicate the plasticity characteristics of a soil. It is the water content, on a percent by weight basis, of the soil (passing #40 sieve) at which the soil changes from a plastic to a liquid state. Generally, the amount of clay- and silt-size particles, the organic matter content, and the type of minerals determine the liquid limit. Soils that have a high liquid limit have the capacity to hold a lot of water while maintaining a plastic or semisolid state. Liquid limit is used in classifying soils in the Unified and AASHTO classification systems. For each soil layer, this attribute is actually recorded as three separate values in the database. A low value and a high value indicate the range of this attribute for the soil component. A "representative" value indicates the expected value of this attribute for the component. For this soil property, only the representative value is used. Rating Options Units of Measure: percent Aggregation Method: Dominant Component Component Percent Cutoff: None Specified Tie-break Rule: Higher Interpret Nulls as Zero: No Layer Options (Horizon Aggregation Method): Depth Range (Weighted Average) Top Depth: 48 Bottom Depth: 84 Units of Measure: Inches Liquid Limit—Rifle Area, Colorado, Parts of Garfield and Mesa Counties 21053-Appleton OWTS Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/27/2021 Page 3 of 3 Sewage Disposal This table shows the degree and kind of soil limitations that affect septic tank absorption fields and sewage lagoons. The ratings are both verbal and numerical. Rating class terms indicate the extent to which the soils are limited by all of the soil features that affect these uses. Not limited indicates that the soil has features that are very favorable for the specified use. Good performance and very low maintenance can be expected. Somewhat limited indicates that the soil has features that are moderately favorable for the specified use. The limitations can be overcome or minimized by special planning, design, or installation. Fair performance and moderate maintenance can be expected. Very limited indicates that the soil has one or more features that are unfavorable for the specified use. The limitations generally cannot be overcome without major soil reclamation, special design, or expensive installation procedures. Poor performance and high maintenance can be expected. Numerical ratings in the table indicate the severity of individual limitations. The ratings are shown as decimal fractions ranging from 0.01 to 1.00. They indicate gradations between the point at which a soil feature has the greatest negative impact on the use (1.00) and the point at which the soil feature is not a limitation (0.00). Septic tank absorption fields are areas in which effluent from a septic tank is distributed into the soil through subsurface tiles or perforated pipe. Only that part of the soil between depths of 24 and 72 inches or between a depth of 24 inches and a restrictive layer is evaluated. The ratings are based on the soil properties that affect absorption of the effluent, construction and maintenance of the system, and public health. Saturated hydraulic conductivity (Ksat), depth to a water table, ponding, depth to bedrock or a cemented pan, and flooding affect absorption of the effluent. Stones and boulders, ice, and bedrock or a cemented pan interfere with installation. Subsidence interferes with installation and maintenance. Excessive slope may cause lateral seepage and surfacing of the effluent in downslope areas. Some soils are underlain by loose sand and gravel or fractured bedrock at a depth of less than 4 feet below the distribution lines. In these soils the absorption field may not adequately filter the effluent, particularly when the system is new. As a result, the ground water may become contaminated. 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. Nearly impervious soil material for the lagoon floor and sides is required to minimize seepage and contamination of ground water. Considered in the ratings are slope, saturated hydraulic conductivity (Ksat), depth to a water table, ponding, depth to bedrock or a cemented pan, flooding, large stones, and content of organic matter. Sewage Disposal---Rifle Area, Colorado, Parts of Garfield and Mesa Counties 21053-Appleton OWTS Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/27/2021 Page 1 of 3 Saturated hydraulic conductivity (Ksat) is a critical property affecting the suitability for sewage lagoons. Most porous soils eventually become sealed when they are used as sites for sewage lagoons. Until sealing occurs, however, the hazard of pollution is severe. Soils that have a Ksat rate of more than 14 micrometers per second are too porous for the proper functioning of sewage lagoons. In these soils, seepage of the effluent can result in contamination of the ground water. Ground-water contamination is also a hazard if fractured bedrock is within a depth of 40 inches, if the water table is high enough to raise the level of sewage in the lagoon, or if floodwater overtops 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. If the lagoon is to be uniformly deep throughout, the slope must be gentle enough and the soil material must be thick enough over bedrock or a cemented pan to make land smoothing practical. Information in this table is intended for land use planning, for evaluating land use alternatives, and for planning site investigations prior to design and construction. The information, however, has limitations. For example, estimates and other data generally apply only to that part of the soil between the surface and a depth of 5 to 7 feet. Because of the map scale, small areas of different soils may be included within the mapped areas of a specific soil. The information is not site specific and does not eliminate the need for onsite investigation of the soils or for testing and analysis by personnel experienced in the design and construction of engineering works. Government ordinances and regulations that restrict certain land uses or impose specific design criteria were not considered in preparing the information in this table. Local ordinances and regulations should be considered in planning, in site selection, and in design. Report—Sewage Disposal [Onsite investigation may be needed to validate the interpretations in this table and to confirm the identity of the soil on a given site. The numbers in the value columns range from 0.01 to 1.00. The larger the value, the greater the potential limitation. The table shows only the top five limitations for any given soil. The soil may have additional limitations] Sewage Disposal–Rifle Area, Colorado, Parts of Garfield and Mesa Counties Map symbol and soil name Pct. of map unit Septic tank absorption fields Sewage lagoons Rating class and limiting features Value Rating class and limiting features Value 23—Detra fine sandy loam, 12 to 25 percent slopes Detra 85 Very limited Very limited Slope 1.00 Slope 1.00 Depth to bedrock 0.77 Depth to hard bedrock 0.42 Slow water movement 0.72 Seepage 0.28 Sewage Disposal---Rifle Area, Colorado, Parts of Garfield and Mesa Counties 21053-Appleton OWTS Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/27/2021 Page 2 of 3 Sewage Disposal–Rifle Area, Colorado, Parts of Garfield and Mesa Counties Map symbol and soil name Pct. of map unit Septic tank absorption fields Sewage lagoons Rating class and limiting features Value Rating class and limiting features Value 39—Jerry loam, 12 to 50 percent slopes Jerry 90 Very limited Very limited Slow water movement 1.00 Slope 1.00 Slope 1.00 Large stones 0.01 Data Source Information Soil Survey Area: Rifle Area, Colorado, Parts of Garfield and Mesa Counties Survey Area Data: Version 13, Jun 5, 2020 Sewage Disposal---Rifle Area, Colorado, Parts of Garfield and Mesa Counties 21053-Appleton OWTS Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 9/27/2021 Page 3 of 3