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Home My WebLink AboutSDP201400024 Assessment - Environmental 2014-03-10 Thomas Jefferson Soil and Water Conservation '1• District 706G Forest Street, Charlottesville, VA 22903 Tel: (434) 975-0224 Fax: (434) 975-1367 h._s., : Web Page: www.tjswcd.or9 Louisa Office: 39 Industrial Dr, Louisa, VA 23093 Phone: 540-967-5940 Fax: 540-967-2557 To: Planning Dept— Albemarle County ATTN: Ellie Ray Date: March 26, 2014 From: Debris Bradshaw Re: Soils Report Soils Report for: Avon Park II - Residential "To exercise leadership in promoting natural resource protection" `rr► '4.111101 ii 1. o E rn 0 t Eye' `rig V }S iiiILC Asna4�, )Eno u.„.®anm° 47= s "/ ul u 0 #MMi n °' App,z i 7.4 I I,/ iv 4:2.1 Np__y%, Q a a is = ,/, et‘0":4!"1,,,r-/.416,...'vair # ). ^k. cLa ,., .„,,a-.,, ,,,,i4 ,, ,..p 1: 0 40 / "Z's 4AT1/4:44,*.4, * "'411110,. 4 ..es, oss (., ///,' zo Its 0 % ,,.._ P,, k 8, .0pIP -4., \ e'- , i, ,� ,. ? r q ' ; • 'd ty -4 . - :n 2 tr, 44 .40 13: I 6” > tk in g o ta�„,A > ■ ),t04-4‘,...,,-,.r.. NJ J gill 2Lf E o M { t} f' z c Qt � ¢ ])n fi —,-:*:".z`1"-ri °4• a ~ � Stiff /if .° .r'" `'s, t" z z P. n OZZLOZb ObiLOZb 09OLOZb 08690Zb 00690Zb OZ89OZb �' co oN O O a M„OT,OE oBL M„OT A£o8L N 41,N rte-. O7 `' N R. ' t‘v-, >4 ‘,. 0 , i 1, n mo a"` � ai s >•O co u) d m °o E 4tit L I n N d o Q � V 8�w I R. 8 -8 8 N. N M C d 4444 V Nx ,y� M O o 3 y.� - ti V �1 R � � Z. O 9 Z 7. d O O 7 C � 16 O z� 2U P M.10 01 o8L ^ M TO DE o81 d OZZLOZO ObTLOZb 090LOZb 08690Zb 0069020 OZ890Z0 0019020 �' z z r N m n 'owe *game ' Soil Map—Albemarle County,Virginia Avon Park II Map Unit Legend Albemarle County,Virginia(VA003) Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI 58B Myersville silt loam,2 to 7 1.0 4.3% percent slopes 58C Myersville silt loam,7 to 15 0.9 4.0% percent slopes 71 B Rabun clay loam,2 to 7 percent 6.3 26.6% slopes 71 C Rabun clay loam,7 to 15 6.7 28.3% percent slopes 72C3 Rabun clay,7 to 15 percent 8.0 34.1% slopes,severely eroded 72D3 Rabun clay,15 to 25 percent 0.6 2.7% slopes,severely eroded Totals for Area of Interest 23.5 100.0% USDA Natural Resources Web Soil Survey 3/26/2014 "I" Conservation Service National Cooperative Soil Survey Page 3 of 3 `.r Map Unit Description(Brief,Generated)—Albemarle County,Virginia Avon Park II Map Unit Description (Brief, Generated) The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions in this report, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas.A map unit is identified and named according to the taxonomic classification of the dominant soils.Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. The Map Unit Description (Brief, Generated) report displays a generated description of the major soils that occur in a map unit. Descriptions of non-soil (miscellaneous areas) and minor map unit components are not included. This description is generated from the underlying soil attribute data. Additional information about the map units described in this report is available in other Soil Data Mart reports,which give properties of the soils and the limitations, capabilities, and potentials for many uses.Also,the narratives that accompany the Soil Data Mart reports define some of the properties included in the map unit descriptions. Report—Map Unit Description (Brief, Generated) Albemarle County, Virginia Map Unit: 58B—Myersville silt loam, 2 to 7 percent slopes Component: Myersville (80%) The Myersville component makes up 80 percent of the map unit. Slopes are 2 to 7 percent. This component is on interfluves, uplands, foothills. The parent material consists of residuum weathered from greenstone. Depth to a root restrictive layer, bedrock, paralithic, is 40 to 60 inches. The natural drainage class is well drained. Water movement in the most restrictive layer is moderately high.Available water to a depth of 60 inches is moderate. Shrink-swell potential is low. This soil is not flooded. It is not ponded.There is no zone of water saturation within a depth of 72 inches. Organic matter content in the surface horizon is about 2 percent. Nonirrigated land capability classification is 2e. This soil does not meet hydric criteria. Map Unit: 58C—Myersville silt loam, 7 to 15 percent slopes USDA Natural Resources Web Soil Survey 3/26/2014 "r Conservation Service National Cooperative Soil Survey Page 1 of 3 • Map Unit Description(Brief,Generated)—Albemarle County,Virginia Avon Park II Component: Myersville (80%) The Myersville component makes up 80 percent of the map unit. Slopes are 7 to 15 percent.This component is on interfluves,uplands,foothills.The parent material consists of residuum weathered from greenstone. Depth to a root restrictive layer, bedrock, paralithic, is 40 to 60 inches.The natural drainage class is well drained. Water movement in the most restrictive layer is moderately high.Available water to a depth of 60 inches is moderate. Shrink-swell potential is low. This soil is not flooded. It is not ponded. There is no zone of water saturation within a depth of 72 inches. Organic matter content in the surface horizon is about 2 percent. Nonirrigated land capability classification is 3e. This soil does not meet hydric criteria. Map Unit: 71 B—Rabun clay loam, 2 to 7 percent slopes Component: Rabun (80%) The Rabun component makes up 80 percent of the map unit. Slopes are 2 to 7 percent.This component is on uplands, interfluves.The parent material consists of residuum weathered from greenstone. Depth to a root restrictive layer is greater than 60 inches.The natural drainage class is well drained.Water movement in the most restrictive layer is moderately high.Available water to a depth of 60 inches is moderate. Shrink-swell potential is low. This soil is not flooded. It is not ponded. There is no zone of water saturation within a depth of 72 inches. Organic matter content in the surface horizon is about 2 percent. Nonirrigated land capability classification is 2e. This soil does not meet hydric criteria. Map Unit: 71 C—Rabun clay loam, 7 to 15 percent slopes Component: Rabun (80%) The Rabun component makes up 80 percent of the map unit. Slopes are 7 to 15 percent.This component is on uplands, interfluves.The parent material consists of residuum weathered from greenstone. Depth to a root restrictive layer is greater than 60 inches.The natural drainage class is well drained. Water movement in the most restrictive layer is moderately high.Available water to a depth of 60 inches is moderate. Shrink-swell potential is low. This soil is not flooded. It is not ponded. There is no zone of water saturation within a depth of 72 inches. Organic matter content in the surface horizon is about 2 percent. Nonirrigated land capability classification is 6e. This soil does not meet hydric criteria. Map Unit: 72C3—Rabun clay, 7 to 15 percent slopes, severely eroded Component: Rabun (80%) USDA Natural Resources Web Soil Survey 3/26/2014 doll Conservation Service National Cooperative Soil Survey Page 2 of 3 'Noe 'vise Map Unit Description(Brief,Generated)—Albemarle County,Virginia Avon Park II The Rabun component makes up 80 percent of the map unit. Slopes are 7 to 15 percent.This component is on interfluves, uplands.The parent material consists of residuum weathered from greenstone. Depth to a root restrictive layer is greater than 60 inches.The natural drainage class is well drained. Water movement in the most restrictive layer is moderately high.Available water to a depth of 60 inches is moderate. Shrink-swell potential is low. This soil is not flooded. It is not ponded. There is no zone of water saturation within a depth of 72 inches. Organic matter content in the surface horizon is about 0 percent. Nonirrigated land capability classification is 4e. This soil does not meet hydric criteria. Map Unit: 72D3—Rabun clay, 15 to 25 percent slopes, severely eroded Component: Rabun (80%) The Rabun component makes up 80 percent of the map unit. Slopes are 15 to 25 percent.This component is on interfluves, uplands.The parent material consists of residuum weathered from greenstone. Depth to a root restrictive layer is greater than 60 inches.The natural drainage class is well drained.Water movement in the most restrictive layer is moderately high.Available water to a depth of 60 inches is moderate. Shrink-swell potential is low. This soil is not flooded. It is not ponded. There is no zone of water saturation within a depth of 72 inches. Organic matter content in the surface horizon is about 0 percent. Nonirrigated land capability classification is 6e. This soil does not meet hydric criteria. Data Source Information Soil Survey Area: Albemarle County, Virginia Survey Area Data: Version 10, Dec 11, 2013 USDA Natural Resources Web Soil Survey 3/26/2014 ■ Conservation Service National Cooperative Soil Survey Page 3 of 3 Nome Nor/ Dwellings and Small Commercial Buildings--Albemarle County,Virginia Avon Park II Dwellings and Small Commercial Buildings Soil properties influence the development of building sites, including the selection of the site,the design of the structure,construction,performance after construction, and maintenance.This table shows the degree and kind of soil limitations that affect dwellings and small commercial buildings. The ratings in the table 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 building site development. 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). Dwellings are single-family houses of three stories or less. For dwellings without basements, the foundation is assumed to consist of spread footings of reinforced concrete built on undisturbed soil at a depth of 2 feet or at the depth of maximum frost penetration, whichever is deeper. For dwellings with basements, the foundation is assumed to consist of spread footings of reinforced concrete built on undisturbed soil at a depth of about 7 feet. The ratings for dwellings are based on the soil properties that affect the capacity of the soil to support a load without movement and on the properties that affect excavation and construction costs.The properties that affect the load-supporting capacity include depth to a water table, ponding, flooding, subsidence, linear extensibility(shrink-swell potential), and compressibility. Compressibility is inferred from the Unified classification. The properties that affect the ease and amount of excavation include depth to a water table, ponding, flooding, slope, depth to bedrock or a cemented pan, hardness of bedrock or a cemented pan, and the amount and size of rock fragments. Small commercial buildings are structures that are less than three stories high and do not have basements.The foundation is assumed to consist of spread footings of reinforced concrete built on undisturbed soil at a depth of 2 feet or at the depth of maximum frost penetration, whichever is deeper.The ratings are based on the soil properties that affect the capacity of the soil to support a load without movement and on the properties that affect excavation and construction costs.The properties that affect the load-supporting capacity include depth to a water table, ponding, flooding, subsidence, linear extensibility(shrink-swell potential), and compressibility(which is inferred from the Unified classification).The properties that affect the ease and amount of excavation include flooding, depth to a water table, ponding, slope, depth to bedrock or a cemented pan, hardness of bedrock or a cemented pan, and the amount and size of rock fragments. USDA Natural Resources Web Soil Survey 3/26/2014 :ice Conservation Service National Cooperative Soil Survey Page 1 of 3 Dwellings and Small Commercial Buildings--Albemarle County,Virginia Avon Park II • 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—Dwellings and Small Commercial Buildings [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] Dwellings and Small Commercial Buildings—Albemarle County,Virginia Map symbol and soil Pct.of Dwellings without basements Dwellings with basements Small commercial buildings name map unit Rating class and Value Rating class and Value Rating class and Value limiting features limiting features limiting features 58B—Myersville silt loam,2 to 7 percent slopes Myersville 80 Not limited Not limited Somewhat limited Slope 0.13 58C—Myersville silt loam,7 to 15 percent slopes Myersville 80 Somewhat limited Somewhat limited Very limited Slope 0.37 Slope 0.37 Slope 1.00 71B—Rabun clay loam,2 to 7 percent slopes Rabun 80 Not limited Not limited Somewhat limited Slope 0.13 71C—Rabun clay loam,7 to 15 percent slopes Rabun 80 Somewhat limited Somewhat limited Very limited Slope 0.37 Slope 0.37 Slope 1.00 USDA Natural Resources Web Soil Survey 3/26/2014 join. Conservation Service National Cooperative Soil Survey Page 2 of 3 Now Noir Dwellings and Small Commercial Buildings--Albemarle County,Virginia Avon Park II Dwellings and Small Commercial Buildings—Albemarle County,Virginia Map symbol and soil Pct.of Dwellings without basements Dwellings with basements Small commercial buildings name map unit Rating class and Value Rating class and Value Rating class and Value limiting features limiting features limiting features 72C3—Rabun clay,7 to 15 percent slopes,severely eroded Rabun 80 Somewhat limited Somewhat limited Very limited Slope 0.37 Slope 0.37 Slope 1.00 • 72D3—Rabun clay,15 to 25 percent slopes,severely eroded Rabun 80 Very limited Very limited 1 Very limited Slope 1.00 Slope 1.00 Slope 1.00 Data Source Information Soil Survey Area: Albemarle County,Virginia Survey Area Data: Version 10, Dec 11, 2013 USDA Natural Resources Web Soil Survey 3/26/2014 Conservation Service National Cooperative Soil Survey Page 3 of 3 Noe Nome Dwellings and Small Commercial Buildings---Albemarle County,Virginia Avon Park II Dwellings and Small Commercial Buildings Soil properties influence the development of building sites, including the selection of the site,the design of the structure,construction,performance after construction, and maintenance.This table shows the degree and kind of soil limitations that affect dwellings and small commercial buildings. The ratings in the table 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 building site development. 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). Dwellings are single-family houses of three stories or less. For dwellings without basements, the foundation is assumed to consist of spread footings of reinforced concrete built on undisturbed soil at a depth of 2 feet or at the depth of maximum frost penetration, whichever is deeper. For dwellings with basements, the foundation is assumed to consist of spread footings of reinforced concrete built on undisturbed soil at a depth of about 7 feet. The ratings for dwellings are based on the soil properties that affect the capacity of the soil to support a load without movement and on the properties that affect excavation and construction costs.The properties that affect the load-supporting capacity include depth to a water table, ponding, flooding, subsidence, linear extensibility (shrink-swell potential), and compressibility. Compressibility is inferred from the Unified classification.The properties that affect the ease and amount of excavation include depth to a water table, ponding, flooding, slope, depth to bedrock or a cemented pan, hardness of bedrock or a cemented pan, and the amount and size of rock fragments. Small commercial buildings are structures that are less than three stories high and do not have basements.The foundation is assumed to consist of spread footings of reinforced concrete built on undisturbed soil at a depth of 2 feet or at the depth of maximum frost penetration, whichever is deeper. The ratings are based on the soil properties that affect the capacity of the soil to support a load without movement and on the properties that affect excavation and construction costs.The properties that affect the load-supporting capacity include depth to a water table, ponding, flooding, subsidence, linear extensibility(shrink-swell potential), and compressibility(which is inferred from the Unified classification).The properties that affect the ease and amount of excavation include flooding, depth to a water table, ponding, slope, depth to bedrock or a cemented pan, hardness of bedrock or a cemented pan, and the amount and size of rock fragments. USDA Natural Resources Web Soil Survey 3/26/2014 "'� Conservation Service National Cooperative Soil Survey Page 1 of 3 lore Nue Dwellings and Small Commercial Buildings---Albemarle County,Virginia Avon Park II 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—Dwellings and Small Commercial Buildings [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] Dwellings and Small Commercial Buildings—Albemarle County,Virginia Map symbol and soil Pct.of Dwellings without basements Dwellings with basements Small commercial buildings name map unit Rating class and Value Rating class and Value Rating class and Value limiting features limiting features limiting features 58B—Myersville silt loam,2 to 7 percent slopes Myersville 80 Not limited Not limited Somewhat limited Slope 0.13 58C—Myersville silt loam,7 to 15 percent slopes Myersville 80 Somewhat limited Somewhat limited Very limited Slope 0.37 Slope 0.37 Slope 1.00 71B—Rabun clay loam,2 to 7 percent slopes Rabun 80 Not limited Not limited Somewhat limited Slope 0.13 71C—Rabun clay loam,7 to 15 percent slopes Rabun 80 Somewhat limited Somewhat limited Very limited Slope 0.37 Slope 0.37 Slope 1.00 USDA Natural Resources Web Soil Survey 3/26/2014 ''n Conservation Service National Cooperative Soil Survey Page 2 of 3 Nov" Nome Dwellings and Small Commercial Buildings—Albemarle County,Virginia Avon Park II Dwellings and Small Commercial Buildings-Albemarle County,Virginia Map symbol and soil Pct.of Dwellings without basements Dwellings with basements Small commercial buildings name map unit Rating class and Value Rating class and Value Rating class and Value limiting features limiting features limiting features 72C3—Rabun clay,7 to 15 percent slopes,severely eroded Rabun 80 Somewhat limited I Somewhat limited Very limited Slope 0.37 Slope 0.37 Slope 1.00 72D3—Rabun clay,15 to 25 percent slopes,severely eroded Rabun 80 Very limited Very limited Very limited Slope 1.00 Slope 1.00 Slope 1.00 Data Source Information Soil Survey Area: Albemarle County, Virginia Survey Area Data: Version 10, Dec 11, 2013 USDA Natural Resources Web Soil Survey 3/26/2014 Conservation Service National Cooperative Soil Survey Page 3 of 3 wise Sewage Disposal---Albemarle County,Virginia Avon Park II 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. USDA Natural Resources Web Soil Survey 3/26/2014 :ice Conservation Service National Cooperative Soil Survey Page 1 of 3 Nose Sewage Disposal—Albemarle County,Virginia Avon Park II 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-Albemarle County,Virginia Map symbol and soil name Pct.of Septic tank absorption fields Sewage lagoons map unit Rating class and limiting Value Rating class and limiting Value features features 58B—Myersville silt loam,2 to 7 percent slopes Myersville 80 Somewhat limited Somewhat limited Depth to bedrock 0.96 Depth to soft bedrock 0.88 Slow water movement 0.50 Slope 0.68 Seepage f 0.50 USDA Natural Resources Web Soil Survey 3/26/2014 'r Conservation Service National Cooperative Soil Survey Page 2 of 3 Sewage Disposal---Albemarle County,Virginia Avon Park II Sewage Disposal—Albemarle County,Virginia Map symbol and soil name Pct.of Septic tank absorption fields Sewage lagoons map unit Rating class and limiting Value Rating class and limiting Value features features 58C—Myersville silt loam,7 to 15 percent slopes Myersville 80 Somewhat limited Very limited Depth to bedrock 0.96 Slope 1.00 Slow water movement 0.50 Depth to soft bedrock 0.88 Slope 0.37 Seepage 0.50 71B—Rabun clay loam,2 to 7 percent slopes Rabun 80 Somewhat limited Somewhat limited Slow water movement 0.50 Slope 0.68 Seepage 0.50 71 C—Rabun clay loam,7 to 15 percent slopes Rabun i 80 Somewhat limited Very limited Slow water movement 0.50 Slope 1.00 Slope 0.37 Seepage 0.50 72C3—Rabun clay,7 to 15 percent slopes,severely eroded Rabun 80 Somewhat limited Very limited Slow water movement 0.50 Slope 1.00 Slope 0.37 Seepage 0.50 72D3—Rabun clay, 15 to 25 percent slopes,severely eroded Rabun 80 Very limited Very limited Slope 1.00 Slope 1.00 Slow water movement 0.50 Seepage 0.50 Data Source Information Soil Survey Area: Albemarle County,Virginia Survey Area Data: Version 10, Dec 11, 2013 USDA Natural Resources Web Soil Survey 3/26/2014 nm� Conservation Service National Cooperative Soil Survey Page 3 of 3 Nter, 'ewe Soil Features—Albemarle County,Virginia Avon Park II Soil Features This table gives estimates of various soil features. The estimates are used in land use planning that involves engineering considerations. A restrictive layer is a nearly continuous layer that has one or more physical, chemical, or thermal properties that significantly impede the movement of water and air through the soil or that restrict roots or otherwise provide an unfavorable root environment. Examples are bedrock, cemented layers, dense layers, and frozen layers.The table indicates the hardness and thickness of the restrictive layer, both of which significantly affect the ease of excavation. Depth to top is the vertical distance from the soil surface to the upper boundary of the restrictive layer. Subsidence is the settlement of organic soils or of saturated mineral soils of very low density. Subsidence generally 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.The table shows the expected initial subsidence,which usually is a result of drainage,and total subsidence,which results from a combination of factors. Potential for 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, saturated hydraulic conductivity(Ksat), 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 to pavements and other rigid structures. Risk of corrosion pertains to potential soil-induced electrochemical or chemical action that corrodes 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 results in a severe hazard of corrosion. The steel or concrete in installations that intersect soil boundaries or soil layers is more susceptible to corrosion than the steel or concrete 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 also is expressed as low, moderate, or high. It is based on soil texture, acidity, and amount of sulfates in the saturation extract. 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