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<br /> 20 Soil Survey
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<br /> surface in disturbed areas for best results in landscaping, agmenls make up 0 to 15 percent of the volume. Th
<br /> particularly for lawns. Deep cuts made in land grading it is aflected by salinity and alkalinity.
<br />' should be covered with a layer of topsoil. Supplemental .This soil is used mainly for grazing. In a few place it
<br /> irrigation is needed al planting lime and during dry is sed for community development and irrigated cr ps.
<br /> periods, a native vegetation is mainly alkali sacalon, stern
<br />' The small areas of Urban land in this complex are whe tgrass, blue grams, and sallgrass. The aver e
<br /> covered by streets, parking lots, sidewalks, buildings, annu t production of air-dry vegetation ranges !r m 500
<br /> and other impervious manmade structures. Because to 1,8 0 pounds per acre. Proper grazing use a d a
<br /> runoff is rapid, storm drains, natural drainageways, and
<br />land grading must accommodate increased flows to planne grazing system are needed to maintai the
<br />quality d quantity of desirable plants and to prevent
<br /> prevent flooding downslope in areas that normally would erosion. eriodic deferment of grazing Burin the growing
<br /> not be subject to flooding. season h ps maintain or improve the rang condition.
<br /> The soils in this complex are limited for community This soil is ifficult to revegetale; therefore proper
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<br />' development by slope, depth to rock, and large stones. s needed to prevent depletio .Grazing
<br />grazing use
<br /> The deep cuts needed to provide a sufficiently level when the so is wet results in compactio of the surface
<br /> building site can expose bedrock. Structures to divert layer, poor tit ,and excessive runoff. S all pastures
<br /> runoff from buildings and roads are needed. Where the commonly are severely overgrazed an eroded.
<br />' density of housing is moderate to high, a community Livestock ins II pastures should be ept in pens. The
<br /> sewage system is needed to prevent contamination of rest of the past a can be used as a rcise areas and
<br /> the water supply by seepage. Effluent from absorption :, for very limited g zing. "
<br /> fields can surface downslope and create a health Grasses, shrub trees, and gard n plants are difficult
<br /> hazard. Cuts and tills should be seeded or mulched. to establish and m inlain on this s it because of excess
<br /> Erosion and sedimentation can be controlled by salts and sodium. ly those pla s that tolerate saline-
<br /> maintaining an adequate plant cover. Some areas can alkaline conditions s ould be se cled for planting.
<br /> be advantageously used as open space or as parks Amendments, tertiliz ,and the eaching of salts help the
<br />' planted with native vegetation and other adapted plants. plants to survive and ecome stablished. A mulch of
<br /> Argiuslolls are in capability subclass Vllo, in the Rocky plant residue helps re ce so' blowing and runoff,
<br /> Foothill range site, and in plant adaptability group F-6. improve soil filth, and c se a moisture. Tillage is
<br />' Rock outcrop is in capability class VIII. difficult because of the c y oam surface Layer and
<br /> clayey subsoil.
<br /> Arvada clay loam, 0 to 2 percent slopes. This ' The small areas of Urb land are covered by streets,
<br />' a de well drained soil on low terraces and flood
<br />plains. This soil formed in calcareous, clayey alluv' m parking lots, sidewalks, it ings, and other impervious
<br />manmade structures. B au a runoff is rapid, storm
<br /> derived ominantly from weathered shale and dstone. drains, natural drainag ays, nd land grading must
<br /> The avers a annual precipitation is 13 to 17 i hes, the . accommodate increas d slow to prevent flooding
<br /> average an al air temperature.is 47° F, an the downslope in areas t at norms y would not be subject to
<br />' average frost- ee season is 126 to 142 d s. Elevation flooding.
<br /> is 5,200 to 6,50 feet. The Arvada soil i limited for c mmunity development
<br /> Typically, the s face layer is mode lely alkaline, by the shrink-swel potential, floo 'ng, low strength, slow
<br />' grayish brown clay am about 6 in es thick. The permeability, and orrosivity. The feels of shrinking and
<br /> subsoil in the upper 'nches is s ngly alkaline, grayish swelling can be inimized by prop engineering design
<br /> brown clay. In the lowe 31 inc sit is strongly alkaline, and by backfilli g with material that as a low shrink-
<br />' light yellowish brown cla n lay loam. The substratum
<br />to a depth of 60 inches is ongly alkaline, pale brown swell potential nd installing surface nd subsurlace
<br />drains near f ndalions. Properly inst led lile drains
<br /> clay loam. below the fo ndation and minimal surl a watering near
<br /> Included in this map it are mall areas of Manzanola the Poundal' n help prevent seepage int basements and
<br /> soils on hill slopes, nn soils o high terraces, Nunn also mini a the effects of shrinking an swelling.
<br />t Variant soils on ter ces, and Ren ill soils on hill slopes Structure to divert runoff are needed. Bu dings and
<br /> and ridges. Also ' eluded are small eas of Urban land. roads sh uld be designed to offset the lima ed ability of
<br /> The included s ds and Urban land ma up about 15 the soil o support a load. The risk o! settle ent can be
<br /> percent oft total acreage of the map nit. minimi ed by compacting the building site b ore
<br />' Permea ' ity of this Arvada soil is slow, he available const coon begins. Special sewage systems ust be
<br /> water c achy is moderate. The elfeclive ro ling depth insla ed because of the slow permeability. Sp cial
<br />' is 60 i hes or more. Runoff is slow, and wat erosion
<br />is a fight hazard. Soil blowing is a moderate h ard. con ideralion of building materials is needed to forestall
<br />cor osion caused by the saline-alkaline conditio Some
<br /> T soil is subject to flooding for brief periods in ring ar as can be used as greenbelts or as parks pla fed
<br /> d summer. The shrink-swell potential is high. Ro lh native vegetation and other adapted plants.
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