SOIL SURVEY

-156-Table 60. Guides for assessing soil limitations for picnic areas .This guide applies to soils considered for intensive use as park-type picnic areas . It is assumed that most vehicular traffi cwill be confined to the access roads ) . Soil suitability for growing and maintaining vegetation is not a part of this guide ,but is an important item to consider in the final evaluation of site .Item sAffectin gUseDegree of Limitatio nNone to Slight ModerateSevere Very SevereWetness (Wet) 2Flooding (Flood)Very rapidly, rapidly ,well, and moderatel ywell drained soils no tsubject to seepag eor ponding . Wate rtable below 50 c mduring season of use .None during seaso nof use .Moderately well draine dsoils subject to occasiona lseepage or ponding an dimperfectly drained soil snot subject to ponding orseepage . Water tabl eabove 50 cm for shor tperiods during season o fuse .May flood 1 or 2 times Floods more than 2per year for short periods times during seasonduring season of use of useImperfectly drained soil ssubject to seepage o rponding . Poorly and verypoorly drained soils . Permanently we tWater table above 50 cm soil sand often near surface fora month or more durin gseason of us eProlonged floodingduring season of use .Slope (Slope) 0 to 9% (AD) 9 to 15% (E) 15 to 30% (F) > 30% (GH )Surface Soil Texture3(Text)Coarse fragments onSurface (C .F .)SiL, CL,SCL, SiCL,Loose sand subjec tSL, FSL,VFSL,L LS, and sand other than SC, SiC,C,Si to severe blowing &loose sand .organic soils0 to 20%20 to 50% 5 > 50%Stoniness' Stones > 2 m apart . Stones 1 to 2 m apart . Stones 0 .1 - 1 m apart . Stones < 0 .1 m apart .(Stony) (Class 0 to 2) (Class 3) (Class 4) (Class 5 )Rock exposures roughly Rock exposures roughly Rock exposures less .30 to 100 or more m 10 to 30 m apart and than than 10 mRockiness 4,6apart and cover < 10% cover 10 to 25% of apart and cover mor e(Rock)of the surface . the . 7 than 25/o of th e(Class 0 to 1) (Class 2) surface . 7 (Class 3,4 )1. For information specific to roads or parking lots, see Table 64 .2. The abbreviations in brackets are used in Table 67 to indicate the nature of the limitation .3. Surface soil texture influences soil ratings as it affects foot trafficability, dust and soil permeability .4. See also definitions for coarse fragments, rockiness, and stoniness in the System of Soil Classification for Canad a(Canada Soil Survey Committee 1974), pp . 217-219 . Coarse fragments for the purpose of this table, includ egravels and cobbles . Stones are evaluated by stoniness .5. Some gravelly soils may be rated as having a slight limitation if the content of gravel exceeds 20% by only a smal lmargin providing (a) the gravel is embedded in the soil matrix, or (b) the fragments are less than 2 cm in size .6. Very shallow soils are rated as having severe or very severe limitations for stoniness or rockiness .Rock exposures to ofrequent to permi tlocation of picni careas . (Class 5)7. The nature and topography of the bedrock exposures may significantly alter these ratings . As such, on-siteinvestigations will be necessary in map units containing bedrock when these are considered as possible sites .