Part 512 - Wetland Conservation 

 512.11(d) 



(d) Deleting soils from list . To delete a hydric soil unit 

 from the list, use the procedure contained in the current Hvdric 

 Soils of the United States for deleting soils from the National 

 List of Hydric Soils. The deletion is not made until the notice of 

 change is published in the Federal Register. 



(e) Use and maintenance of lists . State offices will maintain 

 a copy of the county list of map units. States will maintain a 

 printed list and are encouraged to store the lists electronically 

 in the State Soil Survey Dateibase. The county lists should be used 

 in making wetland inventories and determinations. The lists must 

 be availcQsle to persons making wetland inventories and 

 determinations . 



(f) Determining predominance of hydric soils . Determine 

 whether an area of a field or other parcel of land has a 

 predominance of hydric soils that are inundated or saturated as 

 follows: 



(1) If a soil map unit has hydric soil as all or part of 

 its name, that soil map unit or portion of the map unit related to 

 the hydric soil has a predominance of hydric soils; 



(2) If a soil map unit is named for a miscellaneous area 

 that meets the criteria for hydric soils (i.e., riverwash, playas, 

 beaches, or water) the soil map unit has a predominance of hydric 

 soils; or 



(3) If a soil map unit contains inclusions of hydric 

 soils, that portion of the soil map unit identified as hydric soil 

 has a predominance of hydric soils. 



(g) Criteria for hvdric soils. 



(1) Criteria for hydric soils is found in Hvdric Soils 

 of the United States as pxiblished in the Federal Register. 



(2) In many cases, areas of hydric soils may not 

 coincide with map unit delineations. The DC or soil scientist 

 normally interprets aerial photographs to delineate areas of hydric 

 soils within map unit delineations by using landscape position 

 information provided on the list of hydric soil map units for the 

 county. In some cases an onsite visit will be needed to determine 

 the location of hydric soils within a map unit delineation. The 

 following are methods for locating areas of hydric soils. 



512-10 



(180-V-NFSAM, Second Ed., Amend. 6, May 1991) 



