SOIL SURVEY

-154-Table 58 . Guides for assessing soil limitations for playgrounds .This guide applies to soils to be used intensively for playgrounds for baseball, football, badminton, and for other simila rorganized games . These areas are subject to intensive foot traffic . A nearly level surface, good drainage, and a soi ltexture and consistence that gives a firm surface generally are required . The most desirable soils are free of rock outcropsand coarse fragments .Soil suitability for growing and maintaining vegetation is not a part of this guide, but is an important item to consider i nthe final evaluation of site .Item sAffectin gUseWetness (Wet) 1Flooding (Flood)Permeabi I i t y 2(Perm)None to SlightRapidly, well, an dmoderately wel ldrained soils withno ponding o rseepage . Watertable below 75 cmduring seaso nof use .None during seaso nof use .Very rapid t omoderate .Degree of Soil Limitatio nModerate Severe Very SevereModerately wel ldrained soils subjec tto occasional seepag eor ponding of shor tduration and imperfectl ydrained soils . Wate rtable below 50 c mduring season of use .Occasional flooding .May flood once every2 - 3 years durin gseason of use .Moderately slo wand slow .Imperfectly drainedsoils subject t oseepage or pondin gand poorly and very Permanently we tpoorly drained soils . soils .Water table abov e50 cm during seasonof use .Floods every year .Very slow .Slope (Slope) 0 to 2% (AB) 2 to 5% (C) 5 to 9% (D)Depth to Bedroc k(Rock - D)Coarse fragmentsOn Surface4(C .F .)over 100 cm 50 to 100 cm 3 less than 50 cm 3Relatively free ofcoarse fragments .Stoniness 4 Stones > 10 m apart .(Stony) (Class 0 to 1 )Rockiness 4(Rock)Surface Boi lTextur e(Text)Rock exposures greate rthan 100 m apart an dcover less than 2% o fthe surface .(Class 0)SL,FSL,VFSL,LUp to 20% coarsefragments .Stones 2 to 10 m apart .(Class 2 )Rock exposures 30 to100 m apart andcover about 2 to 10%of the surface .(Class 1)SiL, CL,SCL,SiCL ,LSGreater than 20%coarse fragments .Stones 0 .1-2 m apart .(Class 3, 4)Rock exposures lessthan 30 m apar tand cover greater tha n10% of the surface .SC , SiC,C, S, SiDepth to Sandor Gravel° Greater than 100 cm 50 to 100 cm Less than 50 c m(Sand )1 . The abbreviations in brackets are used in Table 67 to indicate the nature of the limitation .2. In most, if not all of the soils found in Yoho, there is little if any limitation in permeability with regard t oplaygrounds (Appendix C) .3. Downgrade to a very severe limitation if the slope is greater than 5% .Prolonged floodin gduring season of use .Greater than 9 %(EH)Stones < 0 .1 m apart .(Class 5)Rock outcrops to ofrequent to permi tplayground location .S and LS subject toblowing, organi csoils .4. See also definitions in the System of Soil Classification for Canada (Canada Soil Survey Committee 1974) pp 217-219 .Coarse fragments for the purpose of this table include gravels and cobbles . Stones are evaluated by stoniness . _5. Surface soil texture influences soil ratings as it affects foot trafficability, surface wetness, dust, and maintenance .Adverse soil textures may be partially or completely overcome with the addition of topsoil .6. Depth to sand or gravel is considered a limitation in that levelling operations may expose sand or gravel, thereb ybringing about adverse surface textures and undesirable amounts of coarse fragments . The addition of topsoi lafter the levelling process would overcome this limitation .