Display Name: Soils Subsurface Sewage Disposal Systems
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Subsurface sewage disposal systems (SSDS) consist of a house sewer, a septic </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>tank followed by a leaching system, any necessary pumps and siphons, and a </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>groundwater control system upon which the operation of the leaching system </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>depends. This interpretation focuses mainly on the septic tank leaching field </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>and groundwater control system</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN>Soil Potential Ratings</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Soil potential ratings indicate the relative quality of a soil for a </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>particular use compared to other soils in a given area, in this case </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>the State of Connecticut. </SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>The rating criteria were developed by a committee of State and local </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>sanitarians, engineers, and installers. The soils data was provided by </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>the USDA Natural Resources Conservation Service (NRCS), and the performance </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>and site conditions for a typical system were defined. This information </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>provided a standard against which various combinations of properties of </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>soils within Connecticut could be compared.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>The engineering and installation practices used to overcome various soil </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>limitations were listed, and their costs estimated. This information was </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>used to identify limitations and costs associated with installing an SSDS </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>on each soil in Connecticut. Soils with no or minor limitations for the </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>installation of an SSDS were rated the highest. Conversely, soils requiring </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>extensive site modification and design were rated the lowest. The ease of </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>system installation, and therefore cost, formed the basis of the rating scheme.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN>Rating Classes</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>The rating class definitions refer to installation of an SSDS that meets </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>State and local health code regulations. Soils with high potential have </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>characteristics that meet the performance standard. A typical system can </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>be installed at a cost of "x", which represents the going rate for installing </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>an SSDS. The actual value of x varies depending upon many factors unrelated </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>to soil properties. </SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>The cost of installing a leaching field is expressed as a multiple of x and </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>called the cost factor. For example, a cost factor of 3x to and 3.5x means </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>that the estimated cost of installing a leaching field in the particular </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>soil ranges from 3 to 3.5 times more than that of installing a field in a </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>soil with high potential. The cost factors provide relative estimates of </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>the costs of installing an SSDS.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>The soil potential ratings and associated cost factors, assuming a typical </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>system, are defined below.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>High Potential - These soils have the best combination of characteristics </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>or have limitations that can be easily overcome using standard installation practices. </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>The cost factor is 1x to 2.0x.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Medium Potential - These soils have significant limitations, such as low </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>percolation rate, that generally can be overcome using commonly applied designs. </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>The cost factor ranges from 2.0x to 2.5x.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Low Potential - These soils have one or more limitations, such as low percolation </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>rate and depth to seasonal high water table, that require extensive design and </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>site preparation to overcome. The cost factor ranges from 2.5x to 3.5x.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Very Low Potential - These soils have major soil limitations, such as depth to </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>bedrock, that require extensive design and site preparation to overcome. A permit </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>for an SSDS may not be issued unless the naturally occurring soils meet the minimal </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>requirements outlined in the State health code. It is unlikely that these soils </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>can be improved sufficiently to meet State health code regulations. The cost factor </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>ranges from 4.25x to 6.0x.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Extremely Low Potential - These soils have multiple major limitations, such as </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>flooding and depth to seasonal high water table, which are extremely difficult </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>to overcome. A permit for an SSDS may not be issued unless the naturally occurring </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>soils meet the minimal requirements outlined in the State health code. It is </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>unlikely that these soils can be improved sufficiently to meet State health code </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>regulations. </SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Not Rated - Areas labeled Not Rated have soil characteristics that show extreme </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>variability from one location to another. The work needed to overcome adverse soil </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>properties cannot be estimated. These areas commonly are urban land complexes or </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>miscellaneous areas. An on-site investigation is required to determine soil </SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>conditions at the site.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>This data set is a digital soil survey and generally is the most</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>detailed level of soil geographic data developed by the National</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>Cooperative Soil Survey. The information was prepared by digitizing</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>maps, by compiling information onto a planimetric correct base</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>and digitizing, or by revising digitized maps using remotely</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>sensed and other information.</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>This data set consists of georeferenced digital map data and</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>computerized attribute data. The map data are in a soil survey area</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>extent format and include a detailed, field verified inventory</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>of soils and miscellaneous areas that normally occur in a repeatable</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>pattern on the landscape and that can be cartographically shown at</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>the scale mapped. The soil map units are linked to attributes in the</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN><SPAN>National Soil Information System relational database, which gives</SPAN></SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN>the proportionate extent of the component soils and their properties.</SPAN></P></DIV></DIV></DIV>
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