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Home My WebLink About20070257.tiff SOIL SURVEY OF WELD COUNT\, JOLORADO, SOUTHERN PART .) Gerrard Yard 504500 504600 504700 504800 504900 505000 505100 505200 505300 505400 ;. J5 .'......2401:.. ../.f.:7. 4 • . X' Y V -''O,,:*: .''IM„ Y �. N f} 'r4, Ike I, 4 � rz i Y Pt - i �C n'... 2.17,'1', u 0 1 xr fi- r £ ,- r� w t e- . "i i fy' i. - - I g -,.1.-s,� ! T 8 -'s i 4 r Y:" ) 82 sx :k $ T• -rt r d'4- -.T7 l* W t Z4"{*"e Jr vS7�4 Y A J 4 i!- • j h. . . 5 it nI tS N - z f ''3S 1 ,t o iv xf; U+ rt• •ry' 3 J A O & .. - 94y }!8 'P 6�r 1 r h - 1 O1 «.x.:.. ., t y ;,h4}" N r+°Y 1 rq ---.1 - - vex s.'sw- i sla'b p4 'a@ n s ""44..9, i'- g ,�,� tar 8 € Ea i r t tir F� S -,-:,.-40 dy9 i fJtn } t } . ,t!,1:1,7 ,;<]1,`,1e,, t W i p . Ziyt 'Fzy 5 1 lobbies ' „ m 504500 504600 504700 504500 504900 505000 505100 505200 505300 505400 m Meters Feet 2 "` t" 0 45 90 180 0 100 200 400 600 800 W , Natural Resources Web Soil Survey 1.1 7/13/2006 1 Conservation Service National Cooperative Soil Survey Page 1 of 3 } - SOIL SURVEY OF WELD COL , _ , , COLORADO, SOUTHERN PART ) Gerrard Yard MAP LEGEND MAP INFORMATION Soil Map Units O Cities Source of Map: Natural Resources Conservation Service I Detailed Counties Web Soil Survey URL: http://websoilsurvey.nres.usda.gov Detailed States Interstate Highways Coordinate System: UTM Zone 13 Roads Soil Survey Area: Weld County, Colorado, Southern Part y(�I� I- Rails Spatial Version of Data: 2 ) ignin Water Soil Map Compilation Scale: 1:24000 Hydrography r'aE Oceans AYAYAYAY Escarpment,bedrock wvnvnv. Escarpment,non-bedrock Gulley Illllllllnlnl Levee Slope w Blowout N Borrow Pit w Clay Spot • Depression,closed — Eroded Spot X Gravel Pit -; Gravelly Spot 1 Gulley A. Lava Flow ® Landfill Map comprised of aerial images photographed on these dates: .I. Marsh or Swamp 1999 © Miscellaneous Water 0 Rock Outcrop + Saline Spot Sandy Spot ;. Slide-or Slip O Sinkhole % Sodic Spot E Spoil Area The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. 0 Stony Spot As a result, some minor shifting of map unit boundaries may be evident. 60 Vny3tuipy3put CO Perennial Water USDA Natural Resources t Nat Spot Web Soil Survey 1.1 7/13/2006 a Conservation Service National Cooperative Soil Survey Page 2 of 3 • Soil Survey of Weld County,Colorado,Southern tart Gerrard Yard Map Unit Legend Summary Weld County, Colorado, Southern Part Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI .a>i etrce4 S- tS ^ 4t ^k e l et r ,_- rte. 1141 . "M`�n&.wd..r �r 78 Weld loam,0 to 1 percent 7.5 17.5 slopes 582 j X 4 Wt1:6 (Cerny Otp. tom 3015 170 M'„1retteRt S1OpCa4 7 '�' -Sia* USDA Nataral Resources Web Soil Survey I.I 7/13/2006 a Conservation Service National Cooperative Soil Survey Page 3 of 3 Corrosion Concrete Rating Gerrard Yard Tables - Corrosion Concrete Summary by Map Unit-Weld County, Colorado, Southern Part Soil Survey Area Map Unit Name Rating Total Acres in Percent of AOI Map Unit AOI Symbol .y� am *too Jr l 16gmy+F 0f3 Pry '�¢ f T1R.YSri3E } e -' a BTC a y._a v 3 _ �.�ldx«�. �;Liw.,_ ya k._..,,,�c' "� .w#.Za.,.__ 78 Weld loam,0 to 1 Low 7.5 17.5 percent slopes - ,yet p r y N . : -yrp` a s a "'r.. SIa t ¢ Cxixompl � ow=: 01 7G 5 a2s"-° J, °'�7CLGBlltr3lopCS ":" fe v. . " s r- .uN Description - Corrosion Concrete "Risk of corrosion"pertains to potential soil-induced electrochemical or chemical action that corrodes or weakens concrete. The rate of corrosion of concrete is based mainly on the sulfate and sodium content,texture,moisture content,and acidity of the soil. Special site examination and design may be needed if the combination of factors results in a severe hazard of corrosion. The concrete in installations that intersect soil boundaries or soil layers is more susceptible to corrosion than the concrete in installations that are entirely within one kind of soil or within one soil layer. The risk of corrosion is expressed as "Low," "Moderate,"or"High." Parameter Summary - Corrosion Concrete Aggregation Method:Dominant Condition Component Percent Cutoff: Tie-break Rule:Higher USDA Natural Resources Web Soil Survey 1.1 7/13/2006 a Conservation Service National Cooperative Soil Survey Page 3 of 3 Corrosion Steel Rating Gerrard Yard Tables - Corrosion Steel Summary by Map Unit-Weld County, Colorado, Southern Part Soil Survey Area Map Unit Name Rating Total Acres in Percent of AOI Map Unit AOI Symbol 12* c� alay„lo tr .gk ",a*'3` p [e - efTeSrwr + I .y :.,. - u F t Vic^ .. la.a..+xJ...u..v....v mY �.....'� .... 78 Weld loam,0 to 1 High 7.5 17.5 percent slopespofr ^dam�. SZ an t d y Co by complex tg . ` 3u.-1 VA, 47,0attg..,,±;wac• d�.� .,_,-.��4* �"�,•.��..�' s�.PCY98RY SIQI7e8 x �v`� x" � w' g �k';. �*.;, kx 't 3y %3. uay.. ,sr,o • .�.x......^.._—wcu.....,.-. .a�..i...._.. ..a`S,�..,,w,;a..w:....,.sue.-_ti-�...�. ,�.,......3.�;.,��c Description - Corrosion Steel "Risk of corrosion"pertains to potential soil-induced electrochemical or chemical action that corrodes or weakens uncoated steel.The rate of corrosion of uncoated steel is related to such factors as soil moisture,particle-size distribution,acidity,and electrical conductivity of the soil.Special site examination and design may be needed if the combination of factors results in a severe hazard of corrosion.The steel in installations that intersect soil boundaries or soil layers is more susceptible to corrosion than the steel in installations that are entirely within one kind of soil or within one soil layer. The risk of corrosion is expressed as"Low," "Moderate,"or"High." Parameter Summary - Corrosion Steel Aggregation Method:Dominant Condition Component Percent Cutoff: Tie-break Rule:Higher USDA Natural Resources Web Soil Survey 1.1 7/13/2006 a Conservation Service National Cooperative Soil Survey Page 3 of 3 Dwellings With Basements Rating Gerrard Yard Tables - Dwellings With Basements Summary by Map Unit- Weld County, Colorado, Southern Part Soil Map Unit Rating Component Rating Total Percent of Survey Name Name(Percent) Reasons Acres in AOI Area Map AOI Unit Symbol } 42 6 N��S a o d ':r z - , .®' - 78 Weld loam,0 Somewhat Weld(80%) Shrink-swell 7.5 17.5 to 1 percent limited slopes oo-ie loined'h -tle..xy.>s(64°ns ' ` Shtin _ w Q: 0 5 e *€ ere r r5 p ' 3 . 13.5feat to _AZNom' v a4.1: Summary by Rating Value Rating Total Acres in AOI Percent of AOI Somew`hak"ltmitb as "3 -- a. cJar, sn S7 max; Not limited 5.2 12.1 Description - Dwellings With Basements Dwellings are single-family houses of three stories or less.For dwellings with basements,the foundation is assumed to consist of spread footings of reinforced concrete built on undisturbed soil at a depth of about 7 feet. The ratings for dwellings are based on the soil properties that affect the capacity of the soil to support a load without movement and on the properties that affect excavation and construction costs.The properties that affect the load-supporting capacity include depth to a water table,ponding, flooding,subsidence,linear extensibility(shrink-swell potential),and compressibility.Compressibility is inferred from the Unified classification.The properties that affect the ease and amount of excavation include depth to a water table,ponding,flooding,slope,depth to bedrock or a cemented pan, hardness of bedrock or a cemented pan,and the amount and size of rock fragments. Rating class terms indicate the extent to which the soils are limited by all of the soil features that affect building site development. "Not limited"indicates that the soil has features that are very favorable for the specified use.Good performance and very low maintenance can be expected. "Somewhat limited" indicates that the soil has features that are moderately favorable for the specified use.The limitations can be overcome or minimized by special planning, design,or installation, Fair performance and moderate maintenance can be expected. "Very limited" indicates that the soil has one or more features that are unfavorable for the specified use. The limitations generally cannot be overcome without major soil reclamation,special design,or expensive installation procedures.Poor performance and high maintenance can be expected. Parameter Summary - Dwellings With Basements USDA Natural Resources Web Soil Survey 1.1 7/13/2006 al Conservation Service National Cooperative Soil Survey Page 3 of 4 Dwellings With Basements Rating Gerrard Yard Aggregation Method:Dominant Condition Component Percent Cutoff: Tie-break Rule:Higher • USDA Natural Resources Web Soil Survey 1.1 7/13/2006 Conservation Service National Cooperative Soil Survey Page 4 of 4 r Dwellings Without Basements Rating Gerrard Yard Tables - Dwellings Without Basements Summary by Map Unit-Weld County, Colorado, Southern Part Soil Map Unit Rating Component Rating Total Percent of Survey Name Name(Percent) Reasons Acres in AOI Area Map AOI Unit Symbol X42 a Nupntclay. rr N lunited Nunn 85%) x,� brinkswell 2,a a X12 e43r t (66 - ' �ta: 13:141,:6414,33,-.1r floanr,l to 3r . )r x ....a 6, - - xl Ppercentslopea "' F, a t v_... �_ „t` a'.'�'. az....-�,rw�saU.,._..f..h"..r-,.s..�e,_n . . � r...a-at�,a;�,.. +�,..ai., arc. .i ,,..n ._.., :a...l 78 Weld loam,0 Somewhat Weld(80%) Shrink-swell 7.5 17.5 to 1 percent limited slopes r?' -^zpr.-. :w� � 82 �Vi y a onxct to Wiley(64"n Shn Swell` 0 70 com l {SL s tT4idte!'a x _,y- -sr' a. `. -'.snr `q ^as is"z pert g aaR4V, 1-zx 5 3' t # t, slope 2 4 s t a Summary by Rating Value Rating Total Acres in AOI Percent of AOI ?S hewhatltmited 3£$ x 87 t as Very limited 5.2 12.1 Description - Dwellings Without Basements Dwellings are single-family houses of three stories or less.For dwellings without basements,the foundation is assumed to consist of spread footings of reinforced concrete built on undisturbed soil at a depth of 2 feet or at the depth of maximum frost penetration,whichever is deeper. The ratings for dwellings are based on the soil properties that affect the capacity of the soil to support a load without movement and on the properties that affect excavation and construction costs. The properties that affect the load-supporting capacity include depth to a water table,ponding,flooding,subsidence,linear extensibility(shrink-swell potential),and compressibility.Compressibility is inferred from the Unified classification. The properties that affect the ease and amount of excavation include depth to a water table,ponding,flooding,slope,depth to bedrock or a cemented pan,hardness of bedrock or a cemented pan,and the amount and size of rock fragments. Rating class terms indicate the extent to which the soils are limited by all of the soil features that affect building site development. "Not limited" indicates that the soil has features that are very favorable for the specified use. Good performance and very low maintenance can be expected. "Somewhat limited"indicates that the soil has features that are moderately favorable for the specified use.The limitations can be overcome or minimized by special planning,design,or installation.Fair performance and moderate maintenance can be expected. "Very limited" indicates that the soil has one or more features that are unfavorable for the specified use.The limitations generally cannot be overcome without major soil reclamation,special design,or expensive installation procedures.Poor performance and high maintenance can be expected. Parameter Summary - Dwellings Without Basements USDA Natural Resources Web Soil Survey 1.1 7/13/2006 a conservation Service National Cooperative Soil Survey Page 3 of 4 Dwellings Without Basements Rating Gerrard Yard Aggregation Method:Dominant Condition Component Percent Cutoff: Tie-break Rule:Higher USDA Natural Resources Web Soil Survey 1.1 7/13/2006 a Conservation Service National Cooperative Soil Survey Page 4 of 4 Lawn,Landscape,Golf Fairway Rating Gerrard Yard Tables - Lawn, Landscape, Golf Fairway Summary by Map Unit-Weld County, Colorado, Southern Part Soil Map Unit Rating Component Rating Total Percent of Survey Name Name(Percent) Reasons Acres in AOI Area Map AOI Unit Symbol 42 :;=f 'N mx ayv a ≥lot limited .11411. 4,111/- v S p,M1:' „ •121 , loam,. to 3 -`t peeQp?lopes r 78 Weld loam,0 Not limited Weld(80%) 7.5 17.5 to 1 percent slopes 82 ri Wxle Cg%y tltmtte Wiley( a) t' 3b 1' '$ 70 x:kx. slp w � �.s, '...7", " ' k Colbyo°t r Q — ;1'77 i..-,_I Summary by Rating Value Rating Total Acres in AOI Percent of AOI • Description - Lawn, Landscape, Golf Fairway The soils are rated for their use in establishing and maintaining turf for lawns and golf fairways and ornamental trees and shrubs for residential or commercial landscaping.Lawns and landscaping require soils on which turf and ornamental trees and shrubs can be established and maintained. Golf fairways are subject to heavy foot traffic and some light vehicular traffic. Cutting or filling may be required. . The ratings are based on the use of soil material at the location that may have some land smoothing.Irrigation may or may not be needed and is not a criterion in rating.The ratings are based on the soil properties that affect plant growth and trafficability after vegetation is established.The properties that affect plant growth are reaction; depth to a water table; ponding;depth to bedrock or a cemented pan;the available water capacity in the upper 40 inches;the content of salts, sodium,or calcium carbonate;and sulfidic materials. The properties that affect trafficability are flooding,depth to a water table,ponding,slope,stoniness,and the amount of sand,clay,or organic matter in the surface layer. The suitability of the soil for traps,tees,roughs,and greens is not considered in the ratings. Not considered in the ratings,but important in evaluating a site,are the location and accessibility of the area,the size and shape of the area and its scenic quality,vegetation,access to water,potential water impoundment sites,and access to public sewer lines. Soils that are subject to flooding are limited by the duration and intensity of flooding and the season when flooding occurs. In planning recreational facilities,onsite assessment of the height,duration,intensity, and frequency of flooding is essential. Rating class terms indicate the extent to which the soils are limited by all of the soil features that affect the use. "Not limited" indicates that the soil has features that are very favorable for the specified use. Good performance and very low maintenance can be expected. "Somewhat limited" indicates that the soil has features that are moderately favorable for the specified use. USDA Natural Resources Web Soil Survey 1.1 7/13/2006 a Conservation Service National Cooperative Soil Survey Page 3 of4 Lawn,Landscape,Golf Fairway Rating • Gerrard Yard The limitations can be overcome or minimized by special planning,,design,or installation.Fair performance and moderate maintenance can be expected. "Very limited" indicates that the soil has one or more features that are unfavorable for the specified use.The limitations generally cannot be overcome without major soil reclamation,special design,or expensive ^ installation procedures.Poor performance and high maintenance can be expected. Parameter Summary - Lawn, Landscape, Golf Fairway Aggregation Method:Dominant Condition Component Percent Cutoff: Tie-break Rule:Higher • • USDA Natural Resources Web Soil Survey 1.1 7/13/2006 a Conservation Service National Cooperative Soil Survey Page 4 of 4 Local Roads and Streets Rating Gerrard Yard Tables - Local Roads and Streets Summary by Map Unit-Weld County, Colorado, Southern Part Soil Map Unit Rating Component Rating Total Percent of Survey Name Name(Percent) Reasons Acres in AOI Area Map AOI Unit Symbol 42 una olay 4 very lugtted unn(85%� 4} Shnnk-swel a 12.1. , a,,p,� ercentsloypes'� , t -^�.;,� .r, „ �,.x � 1 +oistft .. ^�mv� � M1 J j k' Yip'! `^l m- ''x 5 •^",�"E Fr t �x f..ft .�*- s. x' >jLttve m i fi c“,tt, aCUOn ,x e,. x £, 78 Weld loam,0 Somewhat Weld(80%) Shrink-swell 7.5 17.5 to 1 percent limited slopes Frost action 82 i y Colb ` omevwo:n o itey(60 w} a {Shu'hk-swell 30�. 05 r O T '1H,5. rth a -"'�`' __ Y y �t `fit' ',`''43107-k alit + .m' .Mato 7-48t is J J11 a Summary by Rating Value Rating Total Acres in AOI Percent of AOI .r, Very limited 5.2 12.1 Description - Local Roads and Streets Local roads and streets have an all-weather surface and carry automobile and light truck traffic all year.They have a subgrade of cut or fill soil material;a base of gravel,crushed rock,or soil material stabilized by lime or cement;and a surface of flexible material(asphalt),rigid material(concrete),or gravel with a binder.The ratings are based on the soil properties that affect the ease of excavation and grading and the traffic-supporting capacity. The properties that affect the ease of excavation and grading are depth to bedrock or a cemented pan,hardness of bedrock or a cemented pan,depth to a water table,ponding, flooding,the amount of large stones,and slope..The properties that affect the traffic-supporting capacity are soil strength(as inferred from the AASHTO group index number),subsidence,linear extensibility(shrink-swell potential), the potential for frost action,depth to a water table,and ponding. Rating class terms indicate the extent to which the soils are limited by all of the soil features that affect building site development. "Not limited" indicates that the soil has features that are very favorable for the specified use. Good performance and very low maintenance can be expected. "Somewhat limited" indicates that the soil has features that are moderately favorable for the specified use.The limitations can be overcome or minimized by special planning,design,or installation.Fair performance and moderate maintenance can be expected. "Very limited" indicates that the soil has one or more features that are unfavorable for the specified use.The limitations generally cannot be overcome without major soil reclamation,special design,or expensive installation procedures.Poor performance and high maintenance can be expected. USDA Natural Resources Web Soil Survey 1.1 7/13/2006 a Conservation Service National Cooperative Soil Survey Page 3 of 3 Shallow Excavations Rating Gerrard Yard Tables - Shallow Excavations Summary by Map Unit-Weld County, Colorado, Southern Part Soil Map Unit Rating Component Rating - Total Percent of Survey Name Name(Percent) Reasons Acres in AOI Area Map AOI Unit Symbol 4� Nunn claySomewhat' Nunn(85v) .z; Cutbanks 6 2 12 1 loam,.1 to 3 �-limited cave v , percent slopes [Too clayey 78 Weld loam,0 Somewhat Weld(80%) Cutbanks 7.5 17.5 to I percent limited cave slopes 82 Wiley Colby- _'Som what', '3�' Wiley(60°0) Cutbanks " 301 70.5 ., a ;1 complex l to limited k cave $ �; C- « s , s ':;.;:4-,,,,.,.. .„---,--413 ,.+ ercenC _ € ' doges 'y`- "�' x �` e 110-0z: *�' �� .d' e'J x r rates 4c"]by(301 , -Cut07y2 e4 3e{.4.xx '"' 4r}. wc`...� 2 wave k -F: m Yx e�mx ...�...:._. .x�. .3e: �:v®...':T— ...x .ev�x...c..:.. ..c-cs - ` ..v..ma a.. ...v..r �v.s..0 Summary by Rating Value Rating Total Acres in AOI Percent of AOI STh;omew t 7tt}ttted ., - 4 Tom.; - 100 0:., Description - Shallow Excavations Shallow excavations are trenches or holes dug to a maximum depth of 5 or 6 feet for graves,utility lines,open ditches,or other purposes.The ratings are based on the soil properties that influence the ease of digging and the resistance to sloughing. Depth to bedrock or a cemented pan,hardness of bedrock or a cemented pan,the amount of large stones,and dense layers influence the ease of digging,filling,and compacting.Depth to the seasonal high.water table,flooding,and ponding may restrict the period when excavations can be made. Slope influences the ease of using machinery. Soil texture,depth to the water table,and linear extensibility(shrink-swell potential)influence the resistance to sloughing. Rating class terms indicate the extent to which the soils are limited by all of the soil features that affect building site development. "Not limited"indicates that the soil has features that are very favorable for the specified use.Good performance and very low maintenance can be expected. "Somewhat limited"indicates that the soil has features that are moderately favorable for the specified use.The limitations can be overcome or minimized by special planning,design,or installation.Fair performance and moderate maintenance can be expected. "Very limited" indicates that the soil has one or more features that are unfavorable for the specified use.The limitations generally cannot be overcome without major soil reclamation, special design,or expensive installation procedures. Poor performance and high maintenance can be expected. , Parameter Summary - Shallow Excavations USDA Natural Resources Web Soil Survey I.1 7/13/2006 Conservation Service National Cooperative Soil Survey Page 3 of 4 Shallow Excavations Rating Gerrard Yard Aggregation Method:Dominant Condition Component Percent Cutoff: Tie-break Rule:Higher USDA Natural Resources Web Soil Survey 1.1 7/13/2006 a Conservation Service National Cooperative Soil Survey Page 4 of 4 Small Commercial Buildings Rating Gerrard Yard Tables - Small Commercial Buildings Summary by Map Unit-Weld County, Colorado, Southern Part Soil Map Unit Rating Component Rating Total Percent of Survey Name Name(Percent) Reasons Acres in AOI Area Map AOI Unit Symbol 42 ,yr �tuna,cla verytl.P1 tec,,, cunn(85°E°, brink-sswcll% 5, w�„4 121 " a Inam,Ito , ..r .. percent slo es= r 44.4704 uy y.__ ...z'rt2'a;aa.....4. 4,:asp_7. .._. ,L...._ _,:a-o,:-�` ._,. ,. .,a.a=,. 78 Weld loam,0 Somewhat Weld(80%) Shrink-swell 7.5 17.5 to 1 percent limited slopes le C47 i' Sxrrtlev{hat Wiley 60% - Shrink swel 414 a 03 *4r4 a v 4* eamp '�lt?nile "�5^ r-rt .. a ,:rn 3 ° , ..r. :�. a v244 .`.� } rk /s perpenta, j'F '- * r'x `R444$4Qa' 1 .- `~ ",rs`3 ' '• rgt r..e.'.. 3}.. " .e4,2ga--4.4._:=5-..._ Summary by Rating Value .—� Rating Total Acres in AOI Percent of AOI SOm SIR � ,� � 4ua tv,f ,ar�- '�-5;,...ro.�. Very limited 5.2 12.1 Description - Small Commercial Buildings Small commercial buildings are structures that are less than three stories high and do not have basements.The foundation is assumed to consist of spread footings of reinforced concrete built on undisturbed soil at a depth of 2 feet or at the depth of maximum frost penetration,whichever is deeper.The ratings are based on the soil properties that affect the capacity of the soil to support a load without movement and on the properties that affect excavation and construction costs.The'properties that affect the load-supporting capacity include depth to a water table,ponding,flooding,subsidence,linear extensibility (shrink-swell potential),and compressibility(which is inferred from the Unified classification).The properties that affect the ease and amount of excavation include flooding,depth to a water table,ponding, slope,depth to bedrock or a cemented pan, hardness of bedrock or a cemented pan,and the amount and size of rock fragments. The ratings are based on the soil properties that affect the risk of pollution and the design,construction,and performance of the system.Depth to a water table,ponding,flooding,and depth to bedrock or a cemented pan affect the risk of pollution and the design and construction of the system. Slope,stones,and cobbles also affect design and construction.Ksat and reaction affect performance.Permanently frozen soils are unsuitable for waste treatment. Rating class terms indicate the extent to which the soils are limited by all of the soil features that affect building site development. "Not limited"indicates that the soil has features that are very favorable for the specified use. Good performance and very low maintenance can be expected. "Somewhat limited"indicates that the soil has features that are moderately favorable for the specified use.The limitations can be overcome or minimized by special planning, design,or --. installation.Fair performance and moderate maintenance can be expected. "Very limited" indicates that the soil has one or more features that are unfavorable for the specified use.The limitations generally cannot be overcome without major soil reclamation,special design,or expensive installation procedures.Poor performance and high maintenance can be expected. USDA Natural Resources Web Soil Survey 1.1 7/13/2006 a Conservation Service National Cooperative Soil Survey Page 3 of 3 _ Dwellings and Small Commercial Buildings Weld County,Colorado,Southern Part [The information in this table indicates the dominant soil condition but does not eliminate the need for onsite investigation. The numbers in the value columns range from 0.01 to 1.00. The larger the value,the greater the potential limitation. The table shows only the top five limitations for any given soil. The soil may have additional limitations] Pct. Dwellings without basements Dwellings with basements Small commercial buildings Map symbol of and soil name map unit Rating class and Value Rating class and Value Rating class and Value limiting features limiting features limiting features 42: Nunn 85 Very limited Not limited Very limited Shrink-swell 1 Shrink-swell 1 Haverson 9 Not rated Not rated Not rated Heldt 5 Not rated Not rated Not rated Fluvaquentic Haplustolls 1 Not rated Not rated Not rated 78: Weld 80 Somewhat limited Somewhat limited Somewhat limited Shrink-swell 0.5 Shrink-swell 0.5 Shrink-swell 0.5 Keith 9 Not rated Not rated Not rated Platner 5 Not rated Not rated Not rated Wiley 5 Not rated Not rated Not rated Aquic Argiustolls 1 Not rated Not rated Not rated 82: Wiley 60 Somewhat limited Somewhat limited - Somewhat limited Shrink-swell 0.5 Shrink-swell 0.5 Shrink-swell 0.5 Colby 30 Not limited Not limited Not limited Heldt 4 Not rated Not rated Not rated Weld 4 Not rated Not rated Not rated Aquic Argiustolls 1 Not rated Not rated Not rated Keith 1 Not rated Not rated Not rated USDA Natural Resources Tabular Data Version:6 a— Conservation Service Tabular Data Version Date: 12/14/2005 Page 1 of 2 Dwellings and Small Commercial Buildings Soil properties influence the development of building sites,including the selection of the site,the design of the structure,construction,performance .—.after construction,and maintenance.This table shows the degree and kind of soil limitations that affect dwellings and small commercial buildings. The ratings in the table are both verbal and numerical.Rating class terms indicate the extent to which the soils are limited by all of the soil features that affect building site development."Not limited"indicates that the soil has features that are very favorable for the specified use.Good performance and very low maintenance can be expected."Somewhat limited"indicates that the soil has features that are moderately favorable for the specified use. The limitations can be overcome or minimized by special planning,design,or installation.Fair performance and moderate maintenance can be expected."Very limited"indicates that the soil has one or more features that are unfavorable for the specified use.The limitations generally cannot be overcome without major soil reclamation,special design,or expensive installation procedures.Poor performance and high maintenance can be expected. Numerical ratings in the table indicate the severity of individual limitations.The ratings are shown as decimal fractions ranging from 0.01 to 1.00. They indicate gradations between the point at which a soil feature has the greatest negative impact on the use(1.00)and the point at which the soil feature is not a limitation(0.00). "Dwellings"are single-family houses of three stories or less.For dwellings without basements,the foundation is assumed to consist of spread footings of reinforced concrete built on undisturbed soil at a depth of 2 feet or at the depth of maximum frost penetration,whichever is deeper.For dwellings with basements,the foundation is assumed to consist of spread footings of reinforced concrete built on undisturbed soil at a depth of about 7 feet.The ratings for dwellings are based on the soil properties that affect the capacity of the soil to support a load without movement and on the properties that affect excavation and construction costs.The properties that affect the load-supporting capacity include depth to a water table,ponding, flooding,subsidence,linear extensibility(shrink-swell potential),and compressibility.Compressibility is inferred from the Unified classification.The properties that affect the ease and amount of excavation include depth to a water table,ponding,flooding,slope,depth to bedrock or a cemented pan, hardness of bedrock or a cemented pan,and the amount and size of rock fragments. "Small commercial buildings"are structures that are less than three stories high and do not have basements.The foundation is assumed to consist of spread footings of reinforced concrete built on undisturbed soil at a depth of 2 feet or at the depth of maximum frost penetration,whichever is deeper. The ratings are based on the soil properties that affect the capacity of the soil to support a load without movement and on the properties that affect excavation and construction costs.The properties that affect the load-supporting capacity include depth to a water table,ponding,flooding,subsidence, linear extensibility(shrink-swell potential),and compressibility(which is inferred from the Unified classification).The properties that affect the ease and amount of excavation include flooding,depth to a water table,ponding,slope,depth to bedrock or a cemented pan,hardness of bedrock or a cemented pan,and the amount and size of rock fragments. Information in this table is intended for land use planning,for evaluating land use alternatives,and for planning site investigations prior to design and construction.The information,however,has limitations.For example,estimates and other data generally apply only to that part of the soil between the surface and a depth of 5 to 7 feet.Because of the map scale,small areas of different soils may be included within the mapped areas of a specific soil. The information is not site specific and does not eliminate the need for onsite investigation of the soils or for testing and analysis by personnel experienced in the design and construction of engineering works. Government ordinances and regulations that restrict certain land uses or impose specific design criteria were not considered in preparing the information in this table.Local ordinances and regulations should be considered in planning,in site selection,and in design. USDA Natural Resources Tabular Data Version:6 Conservation Service Tabular Data Version Date: 12/14/2005 Page 2 of 2 Roads and Streets, Shallow Excavations, and Lawns and Landscaping Weld County,Colorado,Southern Part [The information in this table indicates the dominant soil condition but does not eliminate the need for onsite investigation. The numbers in the value columns range from 0.01 to 1.00. The larger the value,the greater the potential limitation. The table shows only the top five limitations for any given soil. The soil may have additional limitations] Pd. Local roads and streets Shallow excavations Lawns and landscaping Map symbol of and soil name map unit Rating class and Value Rating class and Value Rating class and Value limiting features limiting features limiting features 42: Nunn 85 Very limited Somewhat limited Not limited Shrink-swell 1 Cutbanks cave 0.1 Frost action 0.5 Too clayey 0.03 Haverson 9 Not rated Not rated Not rated Heldt 5 Not rated Not rated Not rated Fluvaquentic Haplustolls 1 Not rated Not rated Not rated 78: Weld 80 Somewhat limited Somewhat limited Not limited Shrink-swell 0.5 Cutbanks cave 0.1 Frost action 0.5 ,s+ Keith 9 Not rated Not rated Not rated Platner 5 Not rated Not rated Not rated Wiley 5 Not rated Not rated Not rated Aquic Argiustolls 1 Not rated Not rated - Not rated 82: Wiley 60 Somewhat limited Somewhat limited Not limited Shrink-swell 0.5 Cutbanks cave 0.1 - Colby 30 Not limited Somewhat limited Not limited Cutbanks cave 0.1 Heldt 4 Not rated Not rated Not rated Weld 4 Not rated Not rated Not rated Aquic Argiustolls 1 Not rated Not rated Not rated Keith 1 Not rated Not rated Not rated USDA Natural Resources Tabular Data Version:6 a Conservation Service Tabular Data Version Date: 12/14/2005 Page 1 of 2 Roads and Streets, Shallow Excavations, and Lawns and Landscaping Soil properties influence the development of building sites,including the selection of the site,the design of the structure,construction,performance after construction,and maintenance.This table shows the degree and kind of soil limitations that affect local roads and streets,shallow excavations, and lawns and landscaping. The ratings in the table are both verbal and numerical.Rating class terms indicate the extent to which the soils are limited by all of the soil features that affect building site development."Not limited"indicates that the soil has features that are very favorable for the specified use.Good performance and very low maintenance can be expected."Somewhat limited"indicates that the soil has features that are moderately favorable for the specified use. The limitations can be overcome or minimized by special planning,design,or installation.Fair performance and moderate maintenance can be expected."Very limited"indicates that the soil has one or more features that are unfavorable for the specified use.The limitations generally cannot be overcome without major soil reclamation,special design,or expensive installation procedures.Poor performance and high maintenance can be expected. Numerical ratings in the table indicate the severity of individual limitations.The ratings are shown as decimal fractions ranging from 0.01 to 1.00. They indicate gradations between the point at which a soil feature has the greatest negative impact on the use(1.00)and the point at which the soil feature is not a limitation(0.00). "Local roads and streets"have an all-weather surface and carry automobile and light truck traffic all year.They have a subgrade of cut or fill soil material;a base of gravel,crushed rock,or soil material stabilized by lime or cement;and a surface of flexible material(asphalt),rigid material (concrete),or gravel with a binder.The ratings are based on the soil properties that affect the ease of excavation and grading and the traffic-supporting capacity.The properties that affect the ease of excavation and grading are depth to bedrock or a cemented pan,hardness of bedrock or a cemented pan,depth to a water table,ponding,flooding,the amount of large stones,and slope.The properties that affect the traffic-supporting capacity are soil strength(as inferred from the AASHTO group index number),subsidence,linear extensibility(shrink-swell potential),the potential for frost action,depth to a water table,and ponding. "Shallow excavations"are trenches or holes dug to a maximum depth of 5 or 6 feet for graves,utility lines,open ditches,or other purposes.The ratings are based on the soil properties that influence the ease of digging and the resistance to sloughing. Depth to bedrock or a cemented pan, hardness of bedrock or a cemented pan,the amount of large stones,and dense layers influence the ease of digging,filling,and compacting.Depth to the seasonal high water table,flooding,and ponding may restrict the period when excavations can be made.Slope influences the ease of using machinery.Soil texture,depth to the water table,and linear extensibility(shrink-swell potential)influence the resistance to sloughing. "Lawns and landscaping"require soils on which turf and ornamental trees and shrubs can be established and maintained. Irrigation is not considered in the ratings.The ratings are based on the soil properties that affect plant growth and trafficability after vegetation is established.The properties that affect plant growth are reaction;depth to a water table;ponding;depth to bedrock or a cemented pan;the available water capacity in the upper 40 inches;the content of salts,sodium,or calcium carbonate;and sulfidic materials.The properties that affect trafficability are flooding,depth to a water table,ponding,slope,stoniness,and the amount of sand,clay,or organic matter in the surface layer. Information in this table is intended for land use planning,for evaluating land use alternatives,and for planning site investigations prior to design and construction.The information,however,has limitations.For example,estimates and other data generally apply only to that part of the soil between the surface and a depth of 5 to 7 feet.Because of the map scale,small areas of different soils may be included within the mapped areas of a specific soil. The information is not site specific and does not eliminate the need for onsite investigation of the soils or for testing and analysis by personnel experienced in the design and construction of engineering works. Government ordinances and regulations that restrict certain land uses or impose specific design criteria were not considered in preparing the information in this table.Local ordinances and regulations should be considered in planning,in site selection,and in design. USDA Natural Resources Tabular Data Version:6 a Conservation Service Tabular Data Version Date: 12/14/2005 Page 2 of 2 Gravel Source Rating Gerrard Yard Tables - Summary by Map Unit-Weld County, Colorado,Gravel Southern PartSource Soil Map Unit Rating Component Rating Total Percent of Survey Name Name(Percent) Reasons Acres in AOI Area Map AOI Unit Symbol 42 Nunnclay p = Poor lunn;(85%) `Bottom layer ,5,2 12.[ loam, 1 to 3,� ' '.v w percent slopes ,v g "` Thickest layer 78 Weld loam,0 Poor Weld(80%) Bottom layer 7.5 17.5 to 1 percent slopes Thickest layer mc.i82' Wiley Colby Paor Wiley(60%) Bottom layer 30.1s 70.5 r complex, 1 t.o -1'3 percent "t -. } S e �'$z dopes ��- ter '" r -3-. asv'- . a' - '" a & cv ,,;,-;41;;;;,,,,s,' ,-lr .;ice` -"c :s' ` .-ate,, ttt , a v S= ₹ z rt < " .-v 's .:-'Thtckest layer i Colby j30% ._pottolu layer ,, `-,I- a o TThkkest layerr F l' a. .m. k Orr c ie-- ,...,�Eret. _t.a c�.:fi.,.»....v.,. .. �s.Se ir'..,�..tc .�..,_. .M Summary by Rating Value Rating Total Acres in AOI Percent of AOI Description - Gravel Source Gravel are natural aggregates(2 to 75 millimeters in diameter)suitable for commercial use with a minimum of processing. They are used in many kinds of construction. Specifications for each use vary widely.Only the probability of finding material in suitable quantity is evaluated.The suitability of the material for specific purposes is not evaluated,nor are factors that affect excavation of the material. The properties used to evaluate the soil as a source of gravel are gradation of grain sizes(as indicated by the Unified classification of the soil),the thickness of suitable material,and the content of rock fragments. If the bottom layer of the soil contains gravel, the soil is considered a likely source regardless of thickness.The assumption is that the gravel layer below the depth of observation exceeds the minimum thickness.The ratings are for the whole soil,from the surface to a depth of about 6 feet. The soils are rated"Good,""Fair," or"Poor"as potential sources of gravel.A rating of"Good" or"Fair"means that the source material is likely to be in or below the soil. Coarse fragments of soft bedrock,such as shale and siltstone,are not considered to be gravel. USDA Natural Resources Web Soil Survey 1.1 7/13/2006 a eonsenation Service National Cooperative Soil Survey Page 3 of3 Reclamation Material Source Rating Gerrard Yard Tables - Reclamation Material Source Summary by Map Unit-Weld County, Colorado, Southern Part Soil Map Unit Rating Component Rating Total Percent of Survey Name Name(Percent) Reasons Acres in AOI Area Map AOI Unit Symbol 42 Nunn clay Poor „_ Nunn,(85%°) _ Too clayey 5.2 .; 12.1 I loam, to 3 percent m, ,-dopes Organic �_ _; matter . . content low 78 Weld loam,0 Fair Weld(80%) Organic 7.5 17.5 to 1 percent matter slopes content low%82 Wiley-Colby"n Fair Wiley(60%)" Organic, - `30.1 - 70.5° complex,7 to' ? matter' 3 percent: ` : content low slopes k . ,, Water - - . "_ :. erosion -, ' Colby ,0y9) Organic, F a matter , :s- * -7,...-:41:7,4'.-: contentlow : Water i --- erosion ?r Summary by Rating Value Rating Total Acres in AOI Percent of AOI pan'+ :v 45 �3L,b , 87 9 Ix- Poor 5.2 12.1 USDA Nerurcs b il Suey 1. 7/13/2006 a Conservation ralResou Serevice National CoopSoerativery Soil1 Survey Page 3 of 4 Reclamation Material Source Rating Gerrard Yard • Description - Reclamation Material Source Reclamation material is used in areas that have been drastically disturbed by surface mining or similar activities.When these areas are reclaimed,layers of soil material or unconsolidated geological material, or both,are replaced in a vertical sequence. The reconstructed soil favors plant growth.The ratings do not apply to quarries and other mined areas that require an offsite source of reconstruction material.The ratings are based on the soil properties that affect erosion and stability of the surface • and the productive potential of the reconstructed soil.These properties include the content of sodium,salts,and calcium carbonate;reaction;available water capacity;erodibility;texture; content of rock fragments;and content of organic matter and other features that affect fertility. The soils are rated"Good," "Fair,"or"Poor" as potential sources of reclamation material.The ratings are based on the amount of suitable material and on soil properties that affect the ease of excavation and the performance of the material after it is in place.The thickness of the suitable material is a major consideration. The ease of excavation is affected by large stones,depth to a water table,and slope.How well the soil performs in place after it has been compacted and drained is determined by its strength(as inferred from the AASHTO classification of the soil)and linear extensibility(shrink-swell potential).Normal compaction,minor processing,and other standard construction practices are assumed. When the soil materials are properly used in reconstruction,a rating of"Good"means that vegetation is relatively easy to establish and maintain,that the surface is stable and resists erosion,and that the reconstructed soil has good potential productivity.Material rated"Fair"can be vegetated and stabilized by modifying one or more properties.Topdressing with better material or applications of soil amendments may be necessary for satisfactory performance.Material rated"Poor"has such severe problems that revegetation and stabilization are very difficult and costly.Topdressing with better material is necessary to establish and maintain vegetation. Parameter Summary - Reclamation Material Source Aggregation Method:Dominant Condition Component Percent Cutoff: Tie-break Rule:Lower • USDA Natural Resources Web Soil Survey 1.1 7/13/2006 a Conservation Service National Cooperative Soil Survey Page 4 of 4 Roadfill Source Rating Gerrard Yard Tables - Roadfill Source Summary by Map Unit- Weld County, Colorado, Southern Part Soil Map Unit Rating Component Rating Total Percent of Survey Name Name(Percent) Reasons Acres in AOI Area Map AOI Unit Symbol 42 § , , I umt elay „' s Nunny($5°°) nk swell X5;2 h : 121. ;5 t . percent slopes 78 Weld loam,0 Fair Weld(80%) Shrink-swell 7.5 17.5 to 1 percent slopes 82 V iley Co7b Eau t7ey CzQ°fob � swell 30 1Ad ' P x, r s r�+ to 1't� '" § ' + 3percenfa 'a }� ��` f 7-�,ak '_ Summary by Rating Value Rating Total Acres in AOI Percent of AOI Fail" a. gv k am '1 100-0=a `- v Description - Roadfill Source Roadfill is soil material that is excavated in one place and used in road embankments in another place.The soils are rated as a source of roadfill for low embankments,generally less than 6 feet high and less exacting in design than higher embankments. The ratings are for the whole soil,from the surface to a depth of about 5 feet.It is assumed that soil layers will be mixed when the soil material is excavated and spread. The soils are rated"Good," "Fair," or"Poor"as potential sources of roadfill.The ratings are based on the amount of suitable material and on soil properties that affect the ease of excavation and the performance of the material after it is in place.The thickness of the suitable material is a major consideration. The ease of excavation is affected by large stones,depth to a water table,and slope.How well the soil performs in place after it has been compacted and drained is determined by its strength(as inferred from the AASHTO classification of the soil)and linear extensibility(shrink-swell potential).Normal compaction, minor processing,and other standard construction practices are assumed. Parameter Summary - Roadfill Source Aggregation Method:Dominant Condition Component Percent Cutoff: Tie-break Rule: Lower USDA Natural Resources Web Soil Survey 1.1 7/13/2006 a Conservation Service National Cooperative Soil Survey Page 3 of 3 Sand Source Rating Gerrard Yard Tables - Sand Source Summary by Map Unit-Weld County, Colorado, Southern Part Soil Map Unit Rating Component Rating Total Percent of Survey Name Name(Percent) Reasons Acres in AOI Area Map AOI Unit Symbol 42 Nunn clay Pair =Nunn(85%),,. Thickest layer '5.2t w 12.1 4 loam, Ito 3 w -. _ percent slopes 7-77.4 Bottom layer 78 Weld loam,0 Poor Weld(80%) Bottom layer 7.5 17.5 to 1 percent slopes Thickest layer 82 Wiley Colby Poor £ Wileyj60%) Bottomlayer, 30 1 70 5 x G4 ',4141,44.44',+t 3 geroent w" _ - Sl eS °'x• '`; *,,,:� x �s .µ a .s 24147.1446.1446.47 4'4 ;424'Y Thic4. kest layer Colby(30%) Bottom layer € t est:ayewa Summary by Rating Value Rating Total Acres in AOI Percent of AOI 21;a 411/ 41446T ..44 4 ' :. + r 'g79 1-4,4'2 } 'w t.. x .-..;:_ Fair 5.2 12.1 USDA Natural Resources Wch Soil Survey 1.1 7/13/2006 Conservation Service National Cooperative Soil Survey Page 3 of 4 Sand Source Rating Gerrard Yard Description - Sand Source Sand is a natural aggregate(0.05 to 2 millimeters in diameter)suitable for commercial use with a minimum of processing.It is used in many kinds of construction. Specifications for each use vary widely.Only the probability of finding material in suitable quantity is evaluated.The suitability of the material for specific purposes is not evaluated,nor are factors that affect excavation of the material. The properties used to evaluate the soil as a source of sand are gradation of grain sizes(as indicated by the Unified classification of the soil),the thickness of suitable material,and the content of rock fragments.If the bottom layer of the soil contains sand,the soil is considered a likely source regardless of thickness.The assumption is that the sand layer below the depth of observation exceeds the minimum thickness.The ratings are for the whole soil,from the surface to a depth of about 6 feet. The soils are rated"Good," "Fair,"or"Poor"as potential sources of sand.A rating of"Good"or"Fair"means that the source material is likely to be in or below the soil. Parameter Summary - Sand Source Aggregation Method:Dominant Condition Component Percent Cutoff: Tie-break Rule:Lower • USDA Natural Resources Web Soil Survey 1.1 7/13/2006 a conservation service National Cooperative Soil Survey Page 4 of 4 Topsoil Source Rating Gerrard Yard Tables - Topsoil Source Summary by Map Unit-Weld County, Colorado, Southern Part Soil Map Unit Rating Component Rating Total Percent of Survey Name Name(Percent) Reasons Acres in AOI Area Map AOI Unit Symbol 42, 17unn clay r 4 oo; x `, Nunn(8 /o) Tpo clayey o W 32 4 tga 121 loam 1 fo 3 peccenslopes 'j • 78 Weld loam,0 Good Weld(80%) 7.5 17.5 to 1 percent slopes 82 £ vile/ST lz Goo ;4-41, ey X60° 307 05 t Per . r r r, `a ufoe olby(30° yes t „ ti.ti .�u'� ,,.`",ia,..:cw �a._+,. � � Summary by Rating Value Rating Total Acres in AOI Percent of AOI t ±rte t' i Gtk� ,-a. 3= lxik,.& +. d{ r....r. e, 7 `�,` ..� 3. i+} . .rtes -� ��,_.._._. ...��_.`?£d:. , Q ,..._,.a .+�'d. .,a �� m'[.v-,.-_. Poor 5.2 12.1 Description - Topsoil Source Topsoil is used to cover an area so that vegetation can be established and maintained. The upper 40 inches of a soil is evaluated for use as topsoil.Also evaluated is the reclamation potential of the borrow area.Normal compaction,minor processing,and other standard construction practices are assumed. The soils are rated"Good,""Fair,"or"Poor"as potential sources of topsoil.The ratings are based on the soil properties that affect plant growth;the ease of excavating,loading,and spreading the material;and reclamation of the borrow area.Toxic substances,soil reaction,and the properties that are inferred from soil texture,such as available water capacity and fertility, affect plant growth.The ease of excavating,loading,and spreading is affected by rock fragments, slope,depth to a water table, soil texture,and thickness of suitable material. Reclamation of the borrow area is affected by slope,depth to a water table,rock fragments,depth to bedrock or a cemented pan,and toxic material. The surface layer of most soils is generally preferred for topsoil because of its organic matter content.Organic matter greatly increases the absorption and retention of moisture and nutrients for plant growth. Parameter Summary - Topsoil Source Aggregation Method:Dominant Condition USDA Natunt Resource Web Soil Survey 1.1 7/13/2006 a Conservation Service National Cooperative Soil Survey Page 3 of 4 Topsoil Source Rating Gerrard Yard Component Percent Cutoff: Tie-break Rule:Lower USDA Natural Resources Web Soil Survey 1.1 7/13/2006 al Conservation Service National Cooperative Soil Survey Page 4 of 4 Source of Reclamation Material, Roadfill, and Topsoil Weld County,Colorado,Southern Part [The information in this table indicates the dominant soil condition but does not eliminate the need for onsite investigation. The numbers in the value columns range from 0.00 to 0.99. The smaller the value,the greater the limitation] Pct. Potential as a source of Potential as a source of roadfill Potential as a source of topsoil Map symbol of reclamation material and soil name map — unit Rating class and Value Rating class and Value Rating class and Value limiting features limiting features limiting features 42: Nunn 85 Poor Fair Poor Too clayey 0 Shrink-swell 0.96 Too clayey 0 Organic matter 0.13 content low Haverson 9 Not rated Not rated Not rated Heldt 5 Not rated Not rated Not rated Fluvaquentic Haplustolls 1 Not rated Not rated Not rated 78: Weld 80 Fair Fair Good Organic matter 0.88 Shrink-swell 0.82 content low Keith 9 Not rated Not rated Not rated Platner 5 Not rated Not rated Not rated Wiley 5 Not rated Not rated Not rated Aquic Argiustolls 1 Not rated Not rated Not rated, 82: Wiley. 60 Fair Fair Good Organic matter .0.13 Shrink-swell 0.89 content low Water erosion 0.9 Colby 30 Fair Good Good Organic matter 0.88 content low Water erosion 0.9 Heldt 4 Not rated Not rated Not rated Weld 4 Not rated Not rated Not rated Aquic Argiustolls 1 Not rated Not rated Not rated Keith 1 Not rated Not rated Not rated r USDA Natural Resources Tabular Data Version:6 Conservation Service Tabular Data Version Date: 12/14/2005 Page 1 of 2 Source of Reclamation Material, Roadfill, and Topsoil This table gives information about the soils as potential sources of reclamation material,roadfill,and topsoil.Normal compaction,minor processing, and other standard construction practices are assumed. The soils are rated"good,""fair,"or"poor"as potential sources of reclamation material,roadfill,and topsoil.The features that limit the soils as sources of these materials are specified in the table.Numerical ratings between 0.00 and 0.99 are given after the specified features.These numbers indicate the degree to which the features limit the soils as sources of topsoil,reclamation material,or roadfill.The lower the number,the greater the limitation. "Reclamation material"is used in areas that have been drastically disturbed by surface mining or similar activities.When these areas are reclaimed, layers of soil material or unconsolidated geological material,or both,are replaced in a vertical sequence.The reconstructed soil favors plant growth. The ratings in the table do not apply to quarries and other mined areas that require an offsite source of reconstruction material.The ratings are based on the soil properties that affect erosion and stability of the surface and the productive potential of the reconstructed soil.These properties include the content of sodium,salts,and calcium carbonate;reaction;available water capacity;erodibility;texture;content of rock fragments;and content of organic matter and other features that affect fertility. "Roadfill"is soil material that is excavated in one place and used in road embankments in another place.In this table,the soils are rated as a source of roadfill for low embankments,generally less than 6 feet high and less exacting in design than higher embankments.The ratings are for the whole soil, from the surface to a depth of about 5 feet.It is assumed that soil layers will be mixed when the soil material is excavated and spread. The ratings are based on the amount of suitable material and on soil properties that affect the ease of excavation and the performance of the material after it is in place.The thickness of the suitable material is a major consideration.The ease of excavation is affected by large stones,depth to a water table,and slope.How well the soil performs in place after it has been compacted and drained is determined by its strength(as inferred from the AASHTO classification of the soil)and linear extensibility(shrink-swell potential). "Topsoil"is used to cover an area so that vegetation can be established and maintained.The upper 40 inches of a soil is evaluated for use as topsoil.Also evaluated is the reclamation potential of the borrow area.The ratings are based on the soil properties that affect plant growth;the ease of excavating,loading,and spreading the material;and reclamation of the borrow area.Toxic substances,soil reaction,and the properties that are inferred from soil texture,such as available water capacity and fertility,affect plant growth.The ease of excavating,loading,and spreading is affected by rock fragments,slope,depth to a water table,soil texture,and thickness of suitable material.Reclamation of the borrow area is affected by slope,depth to a water table,rock fragments,depth to bedrock or a cemented pan,and toxic material. The surface layer of most soils is generally preferred for topsoil because of its organic matter content.Organic matter greatly increases the absorption and retention of moisture and nutrients for plant growth. Information in this table is intended for land use planning,for evaluating land use alternatives,and for planning site investigations prior to design and construction.The information,however,has limitations.For example,estimates and other data generally apply only to that part of the soil between the surface and a depth of 5 to 7 feet. Because of the map scale,small areas of different soils may be included within the mapped areas of a specific soil. The information is not site specific and does not eliminate the need for onsite investigation of the soils or for testing and analysis by personnel experienced in the design and construction of engineering works. Govemment ordinances and regulations that restrict certain land uses or impose specific design criteria were not considered in preparing the information in this table.Local ordinances and regulations should be considered in planning,in site selection,and in design. USDA Natural Resources Tabular Data Version:6 aConservation Service Tabular Data Version Date: 12/14/2005 Page 2 of 2 Source of Sand and Gravel Weld County,Colorado,Southern Part [The information in this table indicates the dominant soil condition but does not eliminate the need for onsite investigation. The numbers in the value columns range from 0.00 to 0.99. The larger the value,the greater the likelihood that the bottom layer or thickest layer of the soil is a source of sand or gravel] Pct. Potential as a source of gravel Potential as a source of sand Map symbol of and soil name map unit Rating class and Value Rating class and Value limiting features limiting features 42: Nunn - 85 Poor Fair Bottom layer 0 Thickest layer 0 Thickest layer 0 Bottom layer 0.03 78: Weld 80 Poor Poor Bottom layer 0 Bottom layer 0 Thickest layer 0 Thickest layer 0 82: Wiley 60 Poor Poor Bottom layer 0 Bottom layer 0 Thickest layer 0 Thickest layer 0 • Colby 30 Poor Poor Bottom layer 0 Bottom layer 0 Thickest layer 0 Thickest layer 0 USDANatural Resources This report shows only the major soils in each map unit.Others may exist Tabular Data Version:6 Conservation Service Tabular Data Version Date: 12/14/2005 Page 1 of 1 Ecological Site ID Rating Gerrard Yard Tables - Ecological Site ID Summary by Map Unit- Weld County, Colorado, Southern Part Soil Survey Map Unit Name Rating Total Acres Percent of AOI Area Map Unit in AOI Symbol v—vtrat' +ss rs . . .;�, 4 e e P@ s ,h9 2?„,1„ " T,..ss.. yj ,�3 v. :44.-. �,fa�ga e 7y4 r1,.R'yJ-.ke`,₹t-tY s•X 12zi °rsC._ s .vaa. X4.7'1_9rF 78 Weld loam,0 to I R067BY002CO 7.5 17.5 percent slopes _Azt. = ozca o:I -art liserteetv Sty'. e8 e e � as In e� . �1,,, 44‘xa Description - Ecological Site ID Ecological site ID is an identifier that uniquely identifies a particular ecological site.An"ecological site"is the product of all the environmental factors responsible for its development.It has characteristic soils that have developed over time throughout the soil development process;a characteristic hydrology,particularly infiltration and runoff that has developed over time; and a characteristic plant community(kind and amount of vegetation).The hydrology of the site is influenced by development of the soil and plant community.The vegetation,soils,and hydrology are all interrelated.Each is influenced by the others and influences the development of the others.The plant community on an ecological site is typified by an association of species /-� that differs from that of other ecological sites in the kind and/or proportion of species or in total production.Descriptions of ecological sites are provided in the Field Office Technical Guide,which is available in local offices of the Natural Resources Conservation Service(NRCS). Parameter Summary - Ecological Site ID Class:NRCS Rangeland Site Aggregation Method:Dominant Condition Component Percent Cutoff: Tie-break Rule: Lower USDA Natural Resources Web Soil Survey 1.1 7/13/2006 �� Consemtion Service National Cooperative Soil Survey Page 3 of 3 Ecological Site Name Rating Gerrard Yard Tables - Ecological Site Name Summary by Map Unit-Weld County, Colorado, Southern Part Soil Survey Area Map Unit Name Rating Total Acres in Percent of AOI Map Unit AOI Symbol 78 Weld loam,0 to 1 Loamy 7.5 17.5 percent slopes I en ccpn i t=orE 7 s t " mopes; Description - Ecological Site Name Ecological Site Name is the descriptive name of a particular ecological site.For example,"loamy upland" is a name of a rangeland ecological site.An"ecological site"is the product of all the environmental factors responsible for its development. It has characteristic soils that have developed over time throughout the soil development process;a characteristic hydrology, particularly infiltration and runoff that has developed over time;and a characteristic plant community(kind and amount of vegetation).The hydrology of the site is influenced by development of the soil and plant community.The vegetation,soils, and hydrology are all interrelated.Each is influenced by the others and influences the development of the others. The plant community on an ecological site is typified by an association of species that differs from that of other ecological sites in the �-. kind and/or proportion of species or in total production.Descriptions of ecological sites are provided in the Field Office Technical Guide,which is available in local offices of the Natural Resources Conservation Service(MRCS). Parameter Summary - Ecological Site Name Class:NRCS Rangeland Site Aggregation Method:Dominant Condition Component Percent Cutoff: Tie-break Rule:Lower USDA Natural Resources Web Soil Survey 1.1 7/13/2006 a Conservation Service National Cooperative Soil Survey Page 3 of 3 Irrigated Capability Class Rating Gerrard Yard Tables - Irrigated Capability Class Summary by Map Unit-Weld County, Colorado, Southern Part Soil Survey Area Map Unit Name Rating Total Acres in Percent of AOI Map Unit AOI Symbol }? Ntupaclayloam fto3 ercent sloes 78 Weld loam,0 to 1 2 7.5 17.5 percent slopes r wi z x `vs- t r frafI ey C'otby complex d to 3 percent s14PeS"_ x w. Description - Irrigated Capability Class Land capability classification shows,in a general way,the suitability of soils for most kinds of field crops.Crops that require special management are excluded.The soils are grouped according to their limitations for field crops,the risk of damage if they are used for crops,and the way they respond to management.The criteria used in grouping the soils do not include major and generally expensive landforming that would change slope,depth,or other characteristics of the soils,nor do they include possible but unlikely major reclamation projects.Capability classification is not a substitute for interpretations that show suitability and limitations of groups of soils for rangeland,for woodland,and for engineering purposes. In the capability system,soils are generally grouped at three levels—capability class,subclass,and unit. Only class and subclass are included in this dataset. Capability classes,the broadest groups,are designated by the numbers 1 through 8.The numbers indicate progressively greater limitations and narrower choices for practical use.The classes are defined as follows: Class 1 soils have few limitations that restrict their use. Class 2 soils have moderate limitations that reduce the choice of plants or that require moderate conservation practices. Class 3 soils have severe limitations that reduce the choice of plants or that require special conservation practices,or both. Class 4 soils have very severe limitations that reduce the choice of plants or that require very careful management,or both. Class 5 soils are subject to little or no erosion but have other limitations,impractical to remove,that restrict their use mainly to pasture,rangeland,forestland,or wildlife habitat. Class 6 soils have severe limitations that make them generally unsuitable for cultivation and that restrict their use mainly to pasture,rangeland,forestland,or wildlife habitat. Class 7 soils have very severe limitations that make them unsuitable for cultivation and that restrict their use mainly to grazing,forestland,or wildlife habitat. Class 8 soils and miscellaneous areas have limitations that preclude commercial plant production and that restrict their use to recreational purposes,wildlife habitat,watershed,or esthetic purposes. Parameter Summary - Irrigated Capability Class Aggregation Method:Dominant Condition Component Percent Cutoff: Tie-break Rule:Higher USDA Natural Resources Web Soil Survey 1.1 7/13/2006 a conservation service National Cooperative Soil Survey Page 3 of 3 Map Unit Hydric Rating Rating Gerrard Yard Tables - Map Unit Hydric Rating Summary by Map Unit-Weld County, Colorado, Southern Part Soil Survey Map Unit Name Rating Total Acres Percent of AOI Area Map Unit in AOI Symbol R1Ati.'ry - ;2O41/4.,. o ' r� �y ) b,cssi 2 *Inna o , �,. ral H drtc r, $2 14.. 12 1- 2 ;. gjCpercent°s�to e + ,„... Ssr 78 Weld loam,0 to 1 Partially Hydric 7.5 17.5 percent slopes 82 u` � t L'r "PL dlb -Partall yHydrr` 0 0,55 K0 y cto niplt * n S eA -3 x .fin -x „-r =percenfs dress a -�, s Description - Map Unit Hydric Rating This rating provides an indication of the proportion of the map unit that meets criteria for hydric soils.Map units that are dominantly made up of hydric soils may have small areas,or inclusions,of nonhydric soils in the higher positions on the landform,and map units dominantly made up of nonhydric soils may have inclusions of hydric soils in the lower positions on the landform. Hydric soils are defined by the National Technical Committee for Hydric Soils(NTCHS)as soils that formed under conditions of saturation,flooding,or ponding long enough during the growing season to develop anaerobic conditions in the upper part(Federal Register, 1994).These soils,under natural conditions,are either saturated or inundated long enough during the growing season to support the growth and reproduction of hydrophytic vegetation. The NTCHS definition identifies general soil properties that are associated with wetness.In order to determine whether a specific soil is a hydric soil or nonhydric soil,however,more specific information,such as information about the depth and duration of the water table,is needed.Thus,criteria that identify those estimated soil properties unique to hydric soils have been established(Federal Register,2002).These criteria are used to identify map unit components that normally are associated with wetlands.The criteria used are selected estimated soil properties that are described in"Soil Taxonomy"(Soil Survey Staff, 1999)and"Keys to Soil Taxonomy" (Soil Survey Staff,2003)and in the"Soil Survey Manual"(Soil Survey Division Staff, 1993). If soils are wet enough for a long enough period of time to be considered hydric,they should exhibit certain properties that can be easily observed in the field.These visible properties are indicators of hydric soils.The indicators used to make onsite determinations of hydric soils are specified in"Field Indicators of Hydric Soils in the United States"(Hurt and others,2002). Parameter Summary - Map Unit Hydric Rating Aggregation Method:Absence/Presence Tie-break Rule:Lower USDA Natural Resources Web Soil Survey 1.1 7/13/2006 a Conservation Service National Cooperative Soil Survey Page 3 of 3 • Hydric Soils Weld County,Colorado,Southern Part Percent Map symbol and Hydric Hydric map unit name Component ounitmap Landform rating criteria 42: Nunn clay loam,1 to 3 percent slopes Fluvaquentic Haplustolls 1 Terraces Yes 3 78: Weld loam,0 to 1 percent slopes Aquic Argiustolls 1 Swales Yes 3 82: Wiley-Colby complex, 1 to 3 percent Aquic Argiustolls 1 Swales Yes 3 slopes Explanation of hydric criteria codes: 1. All Histels except for Folistels,and Histosols except for Folists. 2. Soils in Aquic suborders,great groups,or subgroups,Albolls suborder,Historthels great group, Histoturbels great group,Pachic subgroups,or Cumulic subgroups that: A.are somewhat poorly drained and have a water table at the surface(0.0 feet) during the growing season,or B.are poorly drained or very poorly drained and have either: �,.., 1.)a water table at the surface(0.0 feet)during the growing season if textures are coarse sand,sand,or fine sand in all layers within a depth of 20 inches,or 2.)a water table at a depth of 0.5 foot or less during the growing season if permeability is equal to or greater than 6.0 in/hr in all layers within a depth of 20 inches,or 3.)a water table at a depth of 1.0 foot or less during the growing season if permeability is less than 6.0 in/hr in any layer within a depth of 20 inches. 3. Soils that are frequently ponded for long or very long duration during the growing season. 4. Soils that are frequently flooded for long or very long duration during the growing season. This table lists the map unit components that are rated as hydric soils in the survey area.This list can help in planning land uses;however,onsite investigation is recommended to determine the hydric soils on a specific site(National Research Council,1995;Hurt and others,2002). The three essential characteristics of wetlands are hydrophytic vegetation,hydric soils,and wetland hydrology(Cowardin and others,1979;U.S. Army Corps of Engineers,1987;National Research Council, 1995;Tiner,1985).Criteria for all of the characteristics must be met for areas to be identified as wetlands.Undrained hydric soils that have natural vegetation should support a dominant population of ecological wetland plant species. Hydric soils that have been converted to other uses should be capable of being restored to wetlands. Hydric soils are defined by the National Technical Committee for Hydric Soils(NTCHS)as soils that formed under conditions of saturation,flooding, or ponding long enough during the growing season to develop anaerobic conditions in the upper part(Federal Register,1994).These soils,under natural conditions,are either saturated or inundated long enough during the growing season to support the growth and reproduction of hydrophytic vegetation. The NTCHS definition identifies general soil properties that are associated with wetness.In order to determine whether a specific soil is a hydric soil or nonhydric soil,however,more specific information,such as information about the depth and duration of the water table,is needed.Thus,criteria that identify those estimated soil properties unique to hydric soils have been established(Federal Register,2002).These criteria are used to identify map unit components that normally are associated with wetlands.The criteria used are selected estimated soil properties that are described in"Soil Taxonomy"(Soil Survey Staff, 1999)and"Keys to Soil Taxonomy"(Soil Survey Staff,2003)and in the"Soil Survey Manual"(Soil Survey Division Staff, 1993). — If soils are wet enough for a long enough period of time to be considered hydric,theyshould exhibit certain properties that can be easily observed in the field.These visible properties are indicators of hydric soils.The indicators used to make onsite determinations of hydric soils are specified in"Field Indicators of Hydric Soils in the United States"(Hurt and others,2002). Hydric soils are identified by examining and describing the soil to a depth of about 20 inches.This depth may be greater if determination of an appropriate indicator so requires. It is always recommended that soils be excavated and described to the depth necessary for an understanding of the USDA Natural Resources Tabular Data Version:6 Conservation Service Tabular Data Version Date: 12/14/2005 Page 1 of 2 Hydric Soils ^edoximorphic processes.Then,using the completed soil descriptions,soil scientists can compare the soil features required by each indicator and .pecify which indicators have been matched with the conditions observed in the soil.The soil can he identified as a hydric soil if at least one of the approved indicators is present. Map units that are dominantly made up of hydric soils may have small areas,or inclusions,of nonhydric soils in the higher positions on the landform, and map units dominantly made up of nonhydric soils may have inclusions of hydric soils in the lower positions on the landform. The criteria for hydric soils are represented by codes in the table(for example,2B3).Definitions for the codes are as follows: 1.All Histels except for Folistels,and Histosols except for Folists. 2.Soils in Aquic suborders,great groups,or subgroups,Albolls suborder,Historthels great group,Histoturbels great group,Pachic subgroups,or Cumulic subgroups that: A.are somewhat poorly drained and have a water table at the surface(0.0 feet)during the growing season,or B.are poorly drained or very poorly drained and have either: 1)a water table at the surface(0.0 feet)during the growing season if textures are coarse sand,sand,or fine sand in all layers within a depth of 20 inches,or 2)a water table at a depth of 0.5 foot or less during the growing season if saturated hydraulic conductivity(Ksat)is equal to or greater than 6.0 in/hr in all layers within a depth of 20 inches,or 3)a water table at a depth of 1.0 foot or less during the growing season if saturated hydraulic conductivity(Ksat)is less than 6.0 in/hr in any layer within a depth of 20 inches. 3.Soils that are frequently ponded for long or very long duration during the growing season. 4.Soils that are frequently flooded for long or very long duration during the growing season. References: Cowardin,L.M.,V.Carter,F.C.Golet,and E.T.LaRoe.1979.Classification of wetlands and deep-water habitats of the United States.U.S.Fish and Wildlife Service FWS/OBS-79/31. Federal Register.September 18,2002.Hydric soils of the United States. Federal Register.July 13,1994.Changes in hydric soils of the United States. Hurt,G.W.,P.M.Whited,and R.F.Pringle,editors.Version 5.0,2002.Field indicators of hydric soils in the United States. National Research Council.1995.Wetlands:Characteristics and boundaries. --Soil Survey Division Staff.1993.Soil survey manual.Soil Conservation Service.U.S.Department of Agriculture Handbook 18. Soil Survey Staff.2003.Keys to soil taxonomy.9th edition.U.S.Department of Agriculture,Natural Resources Conservation Service. Soil Survey Staff. 1999.Soil taxonomy:A basic system of soil classification for making and interpreting soil surveys.2nd edition.Natural Resources Conservation Service.U.S.Department of Agriculture Handbook 436. Tiner,R.W.,Jr. 1985.Wetlands of Delaware.U.S.Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control,Wetlands Section. United States Army Corps of Engineers,Environmental Laboratory. 1987.Corps of Engineers wetlands delineation manual.Waterways Experiment Station Technical Report Y-87-1. USDA Natural Resources Tabular Data Version:6 Conservation Service Tabular Data Version Date: 12/14/2005 Page 2 of 2 Prime and other Important Farmlands Weld County,Colorado,Southern Part Map Map unit name Farmland classification symbol 42 Nunn clay loam,1 to 3 percent slopes Prime farmland if irrigated 78 Weld loam,0 to 1 percent slopes Prime farmland if irrigated 82 Wiley-Colby complex,1 to 3 percent slopes Prime farmland if irrigated • USDA Natural Resources Tabular Data Version:6 Conservation Service Tabular Data Version Date: 12/14/2005 Page 1 of 2 Prime and other Important Farmlands This table lists the map units in the survey area that are considered important farmlands.Important farmlands consist of prime farmland,unique armland,and farmland of statewide or local importance.This list does not constitute a recommendation for a particular land use. In an effort to identify the extent and location of important farmlands,the Natural Resources Conservation Service,in cooperation with other interested Federal,State,and local government organizations,has inventoried land that can be used for the production of the Nation's food supply. "Prime farmland"is of major importance in meeting the Nation's short-and long-range needs for food and fiber.Because the supply of high-quality farmland is limited,the U.S.Department of Agriculture recognizes that responsible levels of government,as well as individuals,should encourage and facilitate the wise use of our Nation's prime farmland. Prime farmland,as defined by the U.S.Department of Agriculture,is land that has the best combination of physical and chemical characteristics for producing food,feed,forage,fiber,and oilseed crops and is available for these uses.It could be cultivated land,pastureland,forestland,or other land, but it is not urban or built-up land or water areas.The soil quality,growing season,and moisture supply are those needed for the soil to economically produce sustained high yields of crops when proper management,including water management,and acceptable farming methods are applied.In general,prime farmland has an adequate and dependable supply of moisture from precipitation or irrigation,a favorable temperature and growing season,acceptable acidity or alkalinity,an acceptable salt and sodium content,and few or no rocks.The water supply is dependable and of adequate quality.Prime farmland is permeable to water and air.It is not excessively erodible or saturated with water for long periods,and it either is not frequently flooded during the growing season or is protected from flooding.Slope ranges mainly from 0 to 6 percent. More detailed information about the criteria for prime farmland is available at the local office of the Natural Resources Conservation Service. For some of the soils identified in the table as prime farmland,measures that overcome a hazard or limitation,such as flooding,wetness,and droughtiness,are needed.Onsite evaluation is needed to determine whether or not the hazard or limitation has been overcome by corrective measures. A recent trend in land use in some areas has been the loss of some prime farmland to industrial and urban uses.The loss of prime farmland to other uses puts pressure on marginal lands,which generally are more erodible,droughty,and less productive and cannot be easily cultivated. "Unique farmland"is land other than prime farmland that is used for the production of specific high-value food and fiber crops,such as citrus,tree nuts,olives,cranberries,and other fruits and vegetables. It has the special combination of soil quality,growing season,moisture supply,temperature, humidity,air drainage,elevation,and aspect needed for the soil to economically produce sustainable high yields of these crops when properly managed.The water supply is dependable and of adequate quality.Nearness to markets is an additional consideration. Unique farmland is not based on national criteria. It commonly is in areas where there is a special microclimate,such as the wine country in California. In some areas,land that does not meet the criteria for prime or unique farmland is considered to be"farmland of statewide importance"for the production of food,feed,fiber,forage,and oilseed crops.The criteria for defining and delineating farmland of statewide importance are determined by the appropriate State agencies.Generally,this land includes areas of soils that nearly meet the requirements for prime farmland and that economically produce high yields of crops when treated and managed according to acceptable farming methods.Some areas may produce as high a yield as prime farmland if conditions are favorable.Farmland of statewide importance may include tracts of land that have been designated for agriculture by State law. In some areas that are not identified as having national or statewide importance,land is considered to be"farmland of local importance"for the production of food,feed,fiber,forage,and oilseed crops.This farmland is identified by the appropriate local agencies.Farmland of local importance may include tracts of land that have been designated for agriculture by local ordinance. USDA Natural Resources Tabular Data Version:6 Conservation Service Tabular Data Version Date: 12/14/2005 Page 2 of 2 Taxonomic Classification of the Soils Weld County,Colorado,Southern Part Soil name Family or higher taxonomic classification Colby Fine-silty,mixed(calcareous),mesic Aridic Ustorthents Nunn Fine,smectitic,mesic Aridic Argiustolls Weld Fine,smectitic,mesic Aridic Argiustolls Wiley Fine-silty,mixed,mesic Aridic Haplustalfs • USDA Natural Resources Tabular Data Version:6 Mill Conservation Service Tabular Data Version Date: 12/14/2005 Page 1 of 2 Taxonomic Classification of the Soils -- The system of soil classification used by the National Cooperative Soil Survey has six categories(Soil Survey Staff, 1999 and 2003).Beginning with he broadest,these categories are the order,suborder,great group,subgroup,family,and series. Classification is based on soil properties observed in the field or inferred from those observations or from laboratory measurements.This table shows the classification of the soils in the survey area.The categories are defined in the following paragraphs. ORDER. Twelve soil orders are recognized.The differences among orders reflect the dominant soil-forming processes and the degree of soil formation.Each order is identified by a word ending in"sol."An example is Alfisols. SUBORDER. Each order is divided into suborders primarily on the basis of properties that influence soil genesis and are important to plant growth or properties that reflect the most important variables within the orders.The last syllable in the name of a suborder indicates the order.An example is Udalfs("Ltd,"meaning humid,plus"alfs,"from Alfisols). GREAT GROUP. Each suborder is divided into great groups on the basis of close similarities in kind,arrangement,and degree of development of pedogenic horizons;soil moisture and temperature regimes;type of saturation;and base status.E:ach great group is identified by the name of a suborder and by a prefix that indicates a property of the soil.An example is Hapludalfs("Hapi,"meaning minimal horizonation,plus"udalfs,"the suborder of the Alfisols that has a udic moisture regime). SUBGROUP. Each great group has a typic subgroup.Other subgroups are intergrades or extragrades.The typic subgroup is the central concept of the great group;it is not necessarily the most extensive. lntergrades are transitions to other orders,suborders,or great groups.Extragrades have some properties that are not representative of the great group but do not indicate transitions to any other taxonomic class. Each subgroup is identified by one or more adjectives preceding the name of the great group.The adjective"Typic"identifies the subgroup that typifies the great group.An example is Typic Hapludalfs. FAMILY. Families are established within a subgroup on the basis of physical and chemical properties and other characteristics that affect management.Generally,the properties are those of horizons below plow depth where there is much biological activity.Among the properties and characteristics considered are particle-size class,mineralogy class,cation-exchange activity class,soil temperature regime,soil depth,and reaction class.A family name consists of the name of a subgroup preceded by terms that indicate soil properties.An example is fine-loamy,mixed,active,mesic Typic Hapludalfs. SERIES. The series consists of soils within a family that have horizons similar in color,texture,structure,reaction,consistence,mineral and. chemical composition,and arrangement in the profile. References: Soil Survey Staff.1999.Soil taxonomy:A basic system of soil classification for making and interpreting soil surveys.2nd edition. Natural Resources Conservation Service.U.S.Department of Agriculture Handbook 436. Soil Survey Staff.2003.Keys to soil taxonomy.9th edition.U.S.Department of Agriculture,Natural Resources Conservation Service.(The soils in a given survey area may have been classified according to earlier editions of this publication.) USDA Natural Resources Tabular Data Version:6 Conservation Service Tabular Data Version Date: 12/14/2005 Page 2 of 2 Septic Tank Absorption Fields Rating Gerrard Yard Tables - Septic Tank Absorption Fields Summary by Map Unit-Weld County, Colorado, Southern Part Soil Map Unit Rating Component Rating Total Percent of Survey Name Name(Percent) Reasons Acres in AOI Area Map AOI Unit Symbol 42 ' Nimn cla c "' 'ueryltmtte l Ntum(85%) 'Slow water 5 2 s a t • '7,1-0a74:4110,. movement Percent slopes ` ,... ._ 78 Weld loam,0 Somewhat Weld(80%) Slow water 7.5 17.5 to 1 percent limited movement slopes 82 s C .Scrnewbat` Reg 60°/ Slow water r�30 705 s cr � movement ors slopes. € ass. � s 7 Colby U" ' -Slorrtw water T'-�" s r- ," v '_ .<:-.* _ anovetnenk-., .� t�,- , Summary by Rating Value Rating Total Acres in AOI Percent of AOI 'r,r,': ,Nh vas Very limited 5.2 12.1 Description - Septic Tank Absorption Fields Septic tank absorption fields are areas in which effluent from a septic tank is distributed into the soil through subsurface tiles or perforated pipe.Only that part of the soil between depths of 24 and 60 inches is evaluated.The ratings are based on the soil properties that affect absorption of the effluent,construction and maintenance of the system,and public health. Saturated hydraulic conductivity(Ksat),depth to a water table,ponding,depth to bedrock or a cemented pan,and flooding affect absorption of the effluent.Stones and boulders, ice,and bedrock or a cemented pan interfere with installation. Subsidence interferes with installation and maintenance.Excessive slope may cause lateral seepage and surfacing of the effluent in downslope areas. Some soils are underlain by loose sand and gravel or fractured bedrock at a depth of less than 4 feet below the distribution lines.In these soils the absorption field may not adequately filter the effluent,particularly when the system is new.As a result,the ground water may become contaminated. Rating class terms indicate the extent to which the soils are limited by all of the soil features that affect these uses. "Not limited" indicates that the soil has features that are very favorable for the specified use. Good performance and very low maintenance can be expected. "Somewhat limited" indicates that the soil has features that are moderately favorable for the ^ specified use.The limitations can be overcome or minimized by special planning,design,or installation.Fair performance and moderate maintenance can be expected. "Very limited" indicates that the soil has one or more features that are unfavorable for the specified use.The limitations generally cannot be overcome without major soil reclamation, special design,or expensive installation procedures.Poor performance and high maintenance can be expected. USDA Natural Resources Web Soil Survey 1.1 7/13/2006 ala Conservation Service National Cooperative Soil Survey Page 3 of 3 Sewage Disposal Weld County,Colorado,Southern Part [The information in this table indicates the dominant soil condition but does not eliminate the need for onsite investigation. The numbers in the value columns range from 0.01 to 1.00. The larger the value,the greater the potential limitation. The table shows only the top five limitations for any given soil. The soil may have additional limitations] Pct. Septic tank absorption fields Sewage lagoons Map symbol of and soil name map unit Rating class and Rating class and Value alue limiting features limiting features 42: Nunn 85 Very limited Very limited Slow water 1 Seepage 1 movement Haverson 9 Not rated Not rated Heldt 5 Not rated Not rated Fluvaquentic Haplustolls 1 Not rated Not rated 78: Weld 80 Somewhat limited . Somewhat limited Slow water 0.5 Seepage 0.5 movement Keith 9 Not rated Not rated Platner 5 Not rated Not rated Wiley 5 Not rated Not rated Aquic Argiustolls 1 Not rated Not rated 82: Wiley 60 '- Somewhat limited Somewhat limited Slow water 0.5 Seepage 0.5 movement Colby 30 Somewhat limited Somewhat limited Slow water 0.5 Seepage 0.5 movement Heldt 4 Not rated Not rated Weld 4 Not rated Not rated Aquic Argiustolls 1 Not rated Not rated Keith 1 Not rated Not rated USDA Natural Resources Tabular Data Version:6 Conservation Service Tabular Data Version Date: 12/14/2005 Page 1 of 2 Sewage Disposal This table shows the degree and kind of soil limitations that affect septic tank absorption fields and sewage lagoons.The ratings are both verbal and numerical.Rating class terms indicate the extent to which the soils are limited by all of the soil features that affect these uses."Not limited"indicates that the soil has features that are very favorable for the specified use.Good performance and very low maintenance can be expected."Somewhat limited" indicates that the soil has features that are moderately favorable for the specified use.The limitations can be overcome or minimized by special planning,design,or installation.Fair performance and moderate maintenance can be expected."Very limited"indicates that the soil has one or more features that are unfavorable for the specified use.The limitations generally cannot be overcome without major soil reclamation,special design,or expensive installation procedures.Poor performance and high maintenance can be expected. Numerical ratings in the table indicate the severity of individual limitations.The ratings are shown as decimal fractions ranging from 0.01 to 1.00.They indicate gradations between the point at which a soil feature has the greatest negative impact on the use(1.00)and the point at which the soil feature is not a limitation(0.00). "Septic tank absorption fields"are areas in which effluent from a septic tank is distributed into the soil through subsurface tiles or perforated pipe.Only that part of the soil between depths of 24 and 72 inches or between a depth of 24 inches and a restrictive layer is evaluated.The ratings are based on the soil properties that affect absorption of the effluent,construction and maintenance of the system,and public health.Saturated hydraulic conductivity(Ksat),depth to a water table,ponding,depth to bedrock or a cemented pan,and flooding affect absorption of the effluent.Stones and boulders,ice,and bedrock or a cemented pan interfere with installation. Subsidence interferes with installation and maintenance.Excessive slope may cause lateral seepage and surfacing of the effluent in downslope areas. Some soils are underlain by loose sand and gravel or fractured bedrock at a depth of less than 4 feet below the distribution lines.In these soils the absorption field may not adequately filter the effluent,particularly when the system is new.As a result,the ground water may become contaminated. "Sewage lagoons"are shallow ponds constructed to hold sewage while aerobic bacteria decompose the solid and liquid wastes.Lagoons should have a nearly level floor surrounded by cut slopes or embankments of compacted soil.Nearly impervious soil material for the lagoon floor and sides is required to minimize seepage and contamination of ground water.Considered in the ratings are slope,saturated hydraulic conductivity(Ksat),depth to a water table,ponding,depth to bedrock or a cemented pan,flooding,large stones,and content of organic matter. Saturated hydraulic conductivity(Ksat)is a critical property affecting the suitability for sewage lagoons.Most porous soils eventually become sealed when they are used as sites for sewage lagoons.Until sealing occurs, however,the hazard of pollution is severe.Soils that have a Ksat rate of more than 14 micrometers per second are too porous for the proper functioning of sewage lagoons. In these soils,seepage of the effluent can result in contamination of the ground water.Ground-water contamination is also a hazard if fractured bedrock is within a depth of 40 inches,if the water table is high enough to raise the level of sewage in the lagoon,or if floodwater overtops the lagoon. A high content of organic matter is detrimental to proper functioning of the lagoon because it inhibits aerobic activity.Slope,bedrock,and cemented pans can cause construction problems,and large stones can hinder compaction of the lagoon floor.If the lagoon is to be uniformly deep throughout,the slope must be gentle enough and the soil material must be thick enough over bedrock or a cemented pan to make land smoothing practical. Information in this table is intended for land use planning,for evaluating land use alternatives,and for planning site investigations prior to design and construction.The information,however,has limitations.For example, estimates and other data generally apply only to that part of the soil between the surface and a depth of 5 to 7 feet. Because of the map scale,small areas of different soils may be included within the mapped areas of a specific soil. The information is not site specific and does not eliminate the need for onsite investigation of the soils or for testing and analysis by personnel experienced in the design and construction of engineering works. Government ordinances and regulations that restrict certain land uses or impose specific design criteria were not considered in preparing the information in this table. Local ordinances and regulations should be considered in planning,in site selection,and in design. USDA Natural Resources Tabular Data Version:6 Conservation Service Tabular Data Version Date: 12/14/2005 Page 2 of 2 Chemical Soil Properties Weld County,Colorado,Southern Part Cation- Effective Calcium Sodium Map symbol cation- Depth exchange Soil reaction carbon- Gypsum Salinity adsorption and soil name exchange ate ratio capacity capacity In meq/100 g meq/100 g pH Pcf Pd mmhos/cm 42: Nunn 0-9 20-35 — 6.1-7.8 0 0 0.0 0 9-29 15-30 -- 6.1-8.4 0-15 0 0.0-2.0 0 29-60 5.0-15 -- 7.4-8.4 4-15 0 0.0-2.0 0 Haverson --- --- -- --- -- --- — -- Heldt — — -- -- -- -- -- -- Fluvaquentic Haplustolls --- --- -- -- --- --- -- -- 78: Weld 0-8 15-30 — 6.6-7.8 0 0 0.0 0 8-15 20-30 -- 6.6-7.8 0-4 0 0.0 0 15-60 20-30 — 7.4-9.0 2-6 0 0.0-2.0 0 60-64 15-25 -- 7.4-9.0 2-6 0 0.0-2.0 0 Keith --- --- -- --- -- -- -- -- Plainer -- -- -- -- -- --- — -- Wiley — -- --- -- --- — -- — Aquic Argiustolls -- — -- -- -- -- — -- 82: Wiley 0-11 5.0-20 -- 74-84 0-10; .. 0 0.0 0 11-60 10-20 -- 7.9-8.4 5-10 0 0.0 0 60-64 5.0-20 ••- 7.9-9.0 5-15 0 0.0-2.0 0 Colby 0-7 5.0-20 -- 7.4-8.4 0-5 0 0.0 0 7-60 5.0-20 -- 7.4-8.4 5-15 0 0.0 0 Heldt — -- --- -- — — -- --- Weld --- --- --- -- -- --- -- -- Aquic Argiustolls -- -- -- -- -- -- -- -- Keith -- --- -- -- -- — --- -- ,---- USDA Natural Resources Tabular Data Version:6 lia Conservation Service Tabular Data Version Date: 12/14/2005 Page 1 of 2 Chemical Soil Properties .. This table shows estimates of some chemical characteristics and features that affect soil behavior.These estimates are given for the layers of ach soil in the survey area.The estimates are based on field observations and on test data for these and similar soils. "Depth"to the upper and lower boundaries of each layer is indicated. "Cation-exchange capacity"is the total amount of extractable bases that can be held by the soil,expressed in terms of milliequivalents per 100 grams of soil at neutrality(pH 7.0)or at some other stated pH value.Soils having a low cation-exchange capacity hold fewer cations and may require more frequent applications of fertilizer than soils having a high cation-exchange capacity.The ability to retain cations reduces the hazard of ground-water pollution. "Effective cation-exchange capacity"refers to the sum of extractable bases plus aluminum expressed in terms of milliequivalents per 100 grams of soil.It is determined for soils that have pH of less than 5.5. "Soil reaction"is a measure of acidity or alkalinity.It is important in selecting crops and other plants,in evaluating soil amendments for fertility and stabilization,and in determining the risk of corrosion. "Calcium carbonate"equivalent is the percent of carbonates,by weight,in the fraction of the soil less than 2 millimeters in size.The availability of plant nutrients is influenced by the amount of carbonates in the soil. Incorporating nitrogen fertilizer into calcareous soils helps to prevent nitrite accumulation and ammonium-N volatilization. "Gypsum"is expressed as a percent,by weight,of hydrated calcium sulfates in the fraction of the soil less than 20 millimeters in size.Gypsum is partially soluble in water.Soils that have a high content of gypsum may collapse if the gypsum is removed by percolating water. "Salinity"is a measure of soluble salts in the soil at saturation.It is expressed as the electrical conductivity of the saturation extract,in millimhos per centimeter at 25 degrees C.Estimates are based on field and laboratory measurements at representative sites of nonirrigated soils.The salinity of irrigated soils is affected by the quality of the irrigation water and by the frequency of water application.Hence,the salinity of soils in individual fields can differ greatly from the value given in the table.Salinity affects the suitability of a soil for crop production,the stability of soil if used as construction material,and the potential of the soil to corrode metal and concrete. "Sodium adsorption ratio"(SAR)is a measure of the amount of sodium(Na)relative to calcium(Ca)and magnesium(Mg)in the water extract from saturated soil paste.It is the ratio of the Na concentration divided by the square root of one-half of the Ca+Mg concentration.Soils that have SAR values of 13 or more may be characterized by an increased dispersion of organic matter and clay particles,reduced saturated hydraulic conductivity and aeration,and a general degradation of soil structure. USDA Natural Resources Tabular Data Version:6 Conservation Service Tabular Data Version Date:12/14/2005 Page 2 of 2 RUSLE2 Related Attributes Weld County,Colorado,Southern Part Pt.ofunit Representative value Map symbol and soil name map Hydrologic group Kf T factor Sand %Silt %Clay 42: Nunn 85 C .20 5 35.4 33.6 31.0 Haverson 9 --- -- -- -- --- -- Heldt 5 --- -- — -- -- — Fluvaquentic Haplustolls 1 -- -- -- --- -- -- 78: Weld 80 C .24 5 41.6 37.4 21.0 Keith 9 -- --- -- -- -- --- Platner 5 -- — — -- -- — Wiley 5 -- -- -- -- --- -- Aquic Argiustolls 1 -- -- --- — — -- ^ 82: Wiley 60 B .43 5 11.3 67.7 21.0 Colby 30 B .37 5 36.9 42.1 21.0 Heldt 4.. — -- -- -- — Weld 4 -- -- -- — — -- Aquic Argiustolls 1 -- -- -- -- -- _-. _. Keith 1 --- — -- -- -- -- USDA Natural Resources Tabular Data Version:6 Conservation Service Tabular Data Version Date: 12/14/2005 Page 1 of 1 / ) ) Windbreaks and Environmental Plantings Weld County,Colorado,Southern Part Map symbol Trees having predicted 20-year average height of-- and soil name 8 feet or less >8 to 15 feet >15 to 25 feet >25 to 35 feet >35 feet 42: Nunn -- - Honeylocust Siberian elm --- Ponderosa pine Russian olive Western redcedar Haverson --- --- -- Held[ --- -- -- -- Fluvaquentic Haplustolls --- -- --- --- -- 78: Weld --- Common hackberry Ponderosa pine -- --- Eastern redcedar Siberian elm Rocky mountain juniper Russian olive Keith --- -- --- Plainer -- Wiley -- ) Aquic Argiustolls -- -- --- --• --- 82: Wiley -- -- Common hackberry --- --- Honeylocust Ponderosa pine Rocky mountain juniper Russian olive Siberian elm USDA Natural Resources Tabular Data Version:6 Conservation Service Tabular Data Version Date: 12/14/2005 Page 1 of 3 ) ) Windbreaks and Environmental Plantings Weld County,Colorado,Southern Part Map symbol Trees having predicted 20-year average height of-- and soil name 8 feet or less >8 to 15 feet >15 to 25 feet >25 to 35 feet >35 feet 82: Colby Siberian peashrub Eastern redcedar Black locust --- -- Silver buffaloberry Green ash Honeylocust Ponderosa pine Siberian elm Rocky mountain juniper Russian olive Heldt '— __ -- —' -- Weld --- --- --- Aquic Argiustolls --- -- --- Keith --- --- --- USDA Natural Resources Tabular Data Version:6 Conservation Service Tabular Data Version Date: 12/14/2005 Page 2 of 3 Windbreaks and Environmental Plantings Windbreaks protect livestock,buildings,yards,fruit trees,gardens,and cropland from wind and snow;help to keep snow on fields;and provide food and cover for wildlife.Field windbreaks are narrow plantings made at right angles to the prevailing wind and at specific intervals across the field.The interval depends on the erodibility of the soil. Environmental plantings help to beautify and screen houses and other buildings and to abate noise.The plants,mostly evergreen shrubs and trees,are closely spaced.To ensure plant survival,a healthy planting stock of suitable species should be planted properly on a well prepared site and maintained in good condition. This table shows the height that locally grown trees and shrubs are expected to reach in 20 years on soils in the survey area.The estimates are based on measurements and observation of established plantings that have been given adequate care.They can be used as a guide in planning windbreaks and screens.Additional information on planning windbreaks and screens and planting and caring for trees and shrubs can be obtained from the local office of the Natural Resources Conservation Service or of the Cooperative Extension Service or from a commercial nursery. USDA Natural Resources Tabular Data Version:6 a Conservation Service Tabular Data Version Date: 12/14/2005 Page 3 of 3 I ) ) ) Engineering Properties Weld County,Colorado,Southern Part Classification Fragments Percent passing sieve number-- Map symbol Depth USDA texture Liquid Plasticity and soil name>10 3-1O limit Index Unified AASHTO Inches Inches 4 10 40 200 In Pct Pct Pct 42: Nunn 0-9 Clay loam CL A-6 0 0 100 100 90-100 70-80 30-40 10-20 9-29 Clay,Clay loam CH, A-7 0 0-5 95-100 90-100 85-95 65-75 40-60 25-40 CL ) 29-60 Fine sandy loam,Sandy clay SC, A-2, 0 0-5 80-100 75-100 50-80 25-50 15-25 NP-10 loam,Sandy loam SC-SM, A-4 SM Haverson --- --- — --- Heldt --- -- -- --- --- --- --- Fluvaquentic Haplustolls --- -- -- --- --- -- -- --- --- -- -- --- 78: Weld 0-8 Loam CL, A-4 0 0 100 100 85-95 60-75 25-30 5-10 CL-ML 8-15 Clay,Silty clay,Silty clay CL A-6, 0 0 100 100 95-100 85-95 35-50 15-30 loam A-7 15-60 Loam,Silty clay loam,Silt CL, A-4, 0 0 100 95-100 85-100 70-95 20-35 5-15 loam CL-ML A-6 60-64 Loam,Silt loam,Sandy loam CL-ML, A-4 0 0 100 75-100 60-100 35-85 20-30 NP-10 ML, ) SC-SM, SM Keith -- -- --- ___ ___ --- --- --- Platner -- -- --- __. --- --- ___ Wiley --- -- --- --- -- --- --- ___ -__ --- -- USDA Natural Resources Tabular Data Version:6 a Conservation Service Tabular Data Version Date: 12/14/2005 Page 1 of 3 ) ) Engineering Properties Weld County,Colorado,Southern Part Classification Fragments Percent passing sieve number-- Map symbol Depth USDA texture Liquid Plasticity and soil name Unified AASHTO >10 3-10 4 10 40 200 limit index Inches Inches In Pet Pct Pet 78: Aquic Argiustolls --- -- -- —• 82: ) Wiley 0-11 Silt loam ML A-4 0 0 100 100 90-100 70-90 30-35 5-10 11-60 Clay loam,Silty clay loam, CL A-6 0 0 100 100 90-100 70-95 25-35 10-20 Silt loam 60-64 Loam,Silty clay loam,Silt ML A-4, 0 0 100 100 90-100 80-95 30-45 5-15 loam A-6 Colby 0-7 Loam CL, A-4 0 0 100 100 85-95 60-75 25-30 5-10 CL-ML 7-60 Silt loam ML A-4 0 0 100 100 90-100 80-90 30-35 5-10 Heldt --- --- -- --- --- Weld --- --- --- --- --- -- --- --- --- -- -- -- Aquic Argiustolls -- -- -- --- -- -- --- --- --- -- -- -- Keith --- --- -- -- -- ___ --- --- --- --- ) USDA Natural Resources Tabular Data Version:6 • Conservation Service Tabular Data Version Date: 12/14/2005 Page 2 of 3 Engineering Properties This table gives the engineering classifications and the range of engineering properties for the layers of each soil in the survey area. "Depth"to the upper and lower boundaries of each layer is indicated. "Texture"is given in the standard terms used by the U.S.Department of Agriculture.These terms are defined according to percentages of sand,silt,and clay in the traction of the soil that is less than 2 millimeters in diameter."Loam,"for example,is soil that is 7 to 27 percent clay,28 to 50 percent silt,and less than 52 percent sand.If the content of particles coarser than sand is 15 percent or more,an appropriate modifier is added,for example,"gravelly? • "Classification"of the soils is determined according to the Unified soil classification system(ASTM,2005)and the system adopted by the American Association of State Highway and Transportation Officials(AASHTO,2004). The Unified system classifies soils according to properties that affect their use as construction material.Soils are classified according to particle-size distribution of the fraction less than 3 inches in diameter and according to plasticity index,liquid limit,and organic matter content.Sandy and gravelly soils are identified as GW,GP,GM,GC,SW,SP,SM,and SC;silty and clayey soils as ML,CL,OL,MH,CH,and OH;and highly organic soils as PT.Soils exhibiting engineering properties of two groups can have a dual classification,for example,CL-ML. The AASHTO system classifies soils according to those properties that affect roadway construction and maintenance. In this system,the fraction of a mineral soil that is less than 3 inches in diameter is classified in one of seven groups from A-1 through A-7 on the basis of particle-size distribution,liquid limit,and plasticity index.Soils in group A-1 are coarse grained and low in content of fines(silt and clay).At the other extreme,soils in group A-7 are fine grained.Highly organic soils are classified in group A-8 on the basis of visual inspection. If laboratory data are available,the A-1,A-2,and A-7 groups are further classified as A-1-a,A-1-b,A-2-4,A-2-5,A-2-6,A-2-7,A-7-5,or A-7-6.As an additional refinement,the suitability of a soil as subgrade material can be indicated by a group index number.Group index numbers range from 0 for the best subgrade material to 20 or higher for the poorest. "Rock fragments"larger than 10 inches in diameter and 3 to 10 inches in diameter are indicated as a percentage of the total soil on a dry-weight basis.The percentages are estimates determined mainly by converting volume percentage in the field to weight percentage. "Percentage(of soil particles)passing designated sieves"is the percentage of the soil fraction less than 3 inches in diameter based on an ovendry weight.The sieves,numbers 4,10,40,and 200(USA Standard Series),have openings of 4.76,2.00,0.420,and 0.074 millimeters,respectively.Estimates are based on laboratory tests of soils sampled in the survey area and in nearby areas and on estimates made in the field. "Liquid limit"and"plasticity index"(Atterberg limits)indicate the plasticity characteristics of a soil.The estimates are based on test data from the survey area or from nearby areas and on field examination. References: American Association of State Highway and Transportation Officials(AASHTO).2004.Standard specifications for transportation materials and methods of sampling and testing.24th edition. American Society for Testing and Materials(ASTM).2005.Standard classification of soils for engineering purposes.ASTM Standard D2487-00. USDA Natural Resources Tabular Data Version:6 Conservation Service Tabular Data Version Date: 12/14/2005 Page 3 of 3 ) ) ) Physical Soil Properties Y P Weld County,Colorado,Southern Part Erosion factors Wind Wind Map symbol Moist bulk Saturated Available Linear Organic erodl- erodi- and soil name Depth Sand Silt Clay denstty hydraulic water extend- matter bility bility conductivity capacity bility Kw Kf I group index In Pct Pat Pct Won micro t/sec Irvin Pct Pat 42: Nunn 0-9 — — 27-35 1.25.1.40 1.41.4.23 0.17-0.20 3.0-5.9 2.0-3.0 .20 .20 5 6 48 9-29 — — 35-50 1.35-1.40 0.42.1,41 0.15-0.18 6.0-8.9 0.5-2.0 .28 .32 Haverson -- — -- — — -- — — — — — -- -- — Fluvaquentic Haplustolls -- — --- — -- -- -- -- — --- -- — — -- 78: Weld 0-8 — — 15-27 1.25-1.40 4.00-42.00 0.14-0.17 0.0-2.9 2.0-4.0 .24 .24 5 6 48 8-15 — — 35-50 1.30-1.40 0.42-1.41 0.18-0.20 6.0-8.9 0.5-2.0 .28 .28 15-60 — --- 20-35 1.25-1.35 423-14.11 0.16-0.18 3.0-5.9 0.5-1.0 .28 .28 60-64 - .— ., .; 15-25 1.25-1.40 4.23.14.11 0.12-.18: 0.D-2.9 0.5.10 28 .28 Keith --- — -- — -- -- -- -- -- -- — — -- — ) Willey --- -- -- -- -- -- --- -- -- Aqulc Arglustolls — — — — — — — USDA Natural Resources aConservation Service Tabular Data Version:8 Tabular Data Version Date:12/14/2005 Page 1 of 4 ) ) ) Physical Soil Properties Weld County,Colorado,Southern Part Saturated Available Linear Erosion Lectors Wind Wind Map symbol Moist bulk Organic erodi- erodi- and soil name Depth Sand Sil Clay density hydraulic water extensi- matter bllily bitty conductivity capacity bllily Kw Kf T group Index In Pct Pct Pet g/cc micro mtsec Win Pot Pot 82: Wiley 0-11 — 15-27 1.15-1.30 4.23-14.11 0.15-020 0.0-2.9 0.5-1.0 .43 .43 5 4L 86 ) 11.60 — 18-35 1.15-1.30 4.23-14.11 0.19-0.21 3.0-5.9 0.0-0.5 .32 .32 80.64 — — r 1835.1 :..1.151.40 .,.423.14.11 9.18-021-,. 0.0.2.9 0.0-0.5 -.37 .37 Colby 0-7 -- -- 15-27 1.25-1.40 4.00-42.00 0.14-0.18 0.0-2.9 0.5-2.0 .37 .37 5 4L 86 7-60 -- -- 18-27 1.15-1.30 423-14,11 0.15-0.20 0.0-2.9 0.5-1.0 .43 .43 Weld -- — -- — .— -- — -- -- — -- — -- _- Keith --- — -- — -- -- -- --- — — -_ — -_ — i USDA Natural Resources Tabular Data :6 Conservation Service Date: aTabular Data Version Date:12/14/2005 Page 2 of 4 Physical Soil Properties This table shows estimates of some physical characteristics and features that affect soil behavior.These estimates are given for the layers of each soil in the survey area.The estimates are based on field observations and on test data for these and similar soils. "Depth"to the upper and lower boundaries of each layer is indicated. Particle size is the effective diameter of a sod particle as measured by sedimentation,sieving,or micrometric methods.Particle sizes are expressed as classes with specific effective diameter class limits.The broad classes are sand,silt,and clay,ranging from the larger to the smaller. "Sand"as a soil separate consists of mineral soil particles that are 0.05 millimeter to 2 millimeters in diameter.In this table,the estimated sand content of each soil layer is given as a percentage, by weight,of the soil material that Is less than 2 millimeters In diameter. "Slit"as a soil separate consists of mineral soil particles that are 0,002 to 0.05 millimeter in diameter.In this table,the estimated silt content of each soil layer is given as a percentage,by weight,of the soil material that Is less than 2 millimeters in diameter. "Clay"as a soil separate consists of mineral soil particles that are less than 0.002 millimeter in diameter.In this table,the estimated clay content of each soil layer is given as a percentage,by weight,of the soil material that Is less then 2 millimeters in diameter. The content of sand,slit,and clay affects the physical behavior of a soil.Particle size is important for engineering and agronomic interpretations,for determination of soil hydrologic qualities,and for soil classification. The amount and kind of clay affect the fertility and physical condition of the soil and the ability of the soil to adsorb cations and to retain moisture.They Influence shrink-swell potential,saturated hydraulic conductivity(Ksat),plasticity,the ease of soil dispersion,and other soil properties.The amount and kind of clay in a soil also affect tillage and earthmoving operations. "Moist bulk density"is the weight of soil(ovendry)per unit volume.Volume is measured when the soil Is at field moisture capacity,that is,the moisture content at 1/3-or 1/10-bar(33kPa or 10kPa) moisture tension,Weight is determined after the soil is dried at 105 degrees C.In the table,the estimated moist bulk density of each soil horizon is expressed in grams per cubic centimeter of soil material that is less than 2 millimeters in diameter.Bulk density data are used to compute linear extensibility,shrink-swell potential,available water capacity,total pore space,and other soil properties. The moist bulk density of a soil indicates the pore space available for water and roots.Depending on soil texture,a bulk density of more than 1.4 can restrict water storage and root penetration.Moist bulk density is Influenced by texture,kind of clay,content of organic matter,and soil structure. "Saturated hydraulic conductivity(Ksat)"refers to the ease with which pores In a saturated soli transmit water.The estimates in the table are expressed in terms of micrometers per second.They are based on soil characteristics observed in the field,particularly structure,porosity,and texture.Saturated hydraulic conductivity(Ksat)is considered In the design of soil drainage systems and septic tack absorption fields. "Available water capacity"refers to the quantity of water that the soil is capable of storing for use by plants.The capacity for water storage is given in inches of water per inch of soil for each soil layer.The capacity varies,depending on soil properties that affect retention of water.The most important properties are the content of organic matter,soil texture,bulk density,and soil structure. Available water capacity is an Important factor in the choice of plants or crops to be grown and in the design and management of Irrigation systems.Available water capacity is not an estimate of the quantity of water actually available to plants at any given time, "Linear extensibility'refers to the change in length of an unconfined clod as moisture content is decreased from a moist to a dry state.It is an expression of the volume change between the water content of the clod at 1/3-or 1/10-bar tension(33kPa or 10kPa tension)and oven dryness.The volume change is reported In the table as percent change for the whole soil.The amount and type of clay minerals in the soil influence volume change. Linear extensibility is used to determine the shrink-swell potential of soils.The shrink-swell potential is low if the soil has a linear extensibility of less than 3 percent;moderate if 3 to 6 percent;high if 6 to 9 percent;and very high If more than 9 percent.If the linear extensibility is more than 3,shrinking and swelling can cause damage to buildings,roads,and other structures and to plant roots. Special design commonly is needed. "Organic matter"is the plant and animal residue in the soil at various stages of decomposition.In this table,the estimated content of organic matter is expressed as a percentage,by weight,of the soil material that is less than 2 millimeters in diameter, The content of organic matter in a soil can be maintained by returning crop residue to the soil.Organic matter has a positive effect on available water capacity,water infiltration,soil organism activity,and filth.It is a source of nitrogen and other nutrients for crops and soil organisms. USDA Natural Resources 'rill Conservation Service Tabular Data Version:6 Tabular Data Version Date:12/14/2005 Page 3 of 4 } Physical Soil Properties "Erosion factors"are shown in the table as the K factor(Kw and KO and the T factor.Erosion factor K indicates the susceptibility of a soil to sheet and rill erosion by water.Factor K is one of six factors used in the Universal Soil Loss Equation(USLE)and the Revised Universal Soil Loss Equation(RUSLE)to predict the average annual rate of soil loss by sheet and rill erosion in tons per acre per year.The estimates are based primarily on percentage of slit,sand,and organic matter and on soil structure and Ksat.Values of K range from 0.02 to 0.69.Other factors being equal,the higher the value,the more susceptible the soil is to sheet and rill erosion by water. "Erosion factor Kw"indicates the erodibility of the whole soil.The estimates are modified by the presence of rock fragments. "Erosion factor Kt"indicates the erodibility of the fine-earth fraction,or the materiel less than 2 millimeters in size. "Erosion factor T"is an estimate of the maximum average annual rate of soil erosion by wind and/or water that can occur without affecting crop productivity over a sustained period.The rate is in tons per acre per year. "Wnd erodibility groups"are made up of soils that have similar properties affecting their susceptibility to wind erosion in cultivated areas.The soils assigned to group 1 are the most susceptible to wind erosion,and those assigned to group 8 are the least susceptible.The groups are described in the"National Soll Survey Handbook." "Wind erodibility index"is a numerical value indicating the susceptibility of soil to wind erosion,or the tons per acre per year that can be expected to be lost to wind erosion.There is a close correlation between wind erosion and the texture of the surface layer,the size and durability of surface clods,rock fragments,organic matter,and a calcareous reaction.Soil moisture and frozen soil layers also influence wind erosion. Reference: United States Department of Agriculture,Natural Resources Conservation Service.National soil survey handbook,title 430-VI.(http://www.soils.usda.gov) 1 USDA Natural Resources Tabular Data Version:6 Conservation Service Tabular Data Version Date:12/14/2005 Page 4 of 4 ) ) ) Soil Features Weld County,Colorado,Southern Part Restrictive layer Subsidence Risk of corrosion Potential Map symbol fpthor frost and soil name Kind �. to Thickness Hardness Initial Total action Uncoated Concrete topsteel In In In In 42: Nunn — .-„w ;, — 0 Moderate _ High Low Haverson — -- --- -- — __ -- — Heldt •— Fluvequentic Haplustolis — --- -- — ___ — — — — 78: Keith -- __ -- — -- — — __ -_ Plainer. — •_ _ Wiley — -- -- — ___ — — ___ — Aquic Argiustolts ...— — _ — 82: Wiley p -- p. — 0 -;.Low High Low Colby -- -- -- --- 0 -- Low Low Low Weld --- -- -- Aquic Argiustolls — - •- _. ._ - USDA Natural Resources Tabular Data Version:6 Conservation Service Tabular Data Version Date:12/14/2005 Page 1 of 3 ) ) ) Soil Features Weld County,Colorado,Southern Part Restrictive layer Subsidence Potential Risk of corrosion Map symbol for frost and soil name Depth to Uncoated Kind Thickness Hardness Initial Total action steal Concrete top In In In In 82: Keith — __ ._ __ — -- — — — ) ) USDA Natural Resources a Conservation Service Tabular Data Version:6 Tabular Data Version Date:12/14/2005 Page 2 of 3 l Soil Features This table gives estimates of various soil features.The estimates are used in land use planning that involves engineering considerations. A"restrictive layer"is a nearly continuous layer that has one or more physical,chemical,or thermal properties that significantly impede the movement of water and air through the soil or that restrict roots or otherwise provide an unfavorable root environment.Examples are bedrock,cemented layers,dense layers,and frozen layers.The table Indicates the hardness and thickness of the restrictive layer,both of which significantly affect the ease of excavation."Depth to top"Is the vertical distance from the soil surface to the upper boundary of the restrictive layer. "Subsidence"is the settlement of organic soils or of saturated mineral soils of very low density.Subsidence generally results from either desiccation and shrinkage,or oxidation of organic material,or both,following drainage.Subsidence takes place gradually,usually over a period of several years.The table shows the expected initial subsidence,which usually Is a result of drainage,and total subsidence,which results from a combination of factors. "Potential for frost action"is the likelihood of upward or lateral expansion of the soil caused by the formation of segregated ice lenses(frost heave)and the subsequent collapse of the soil and loss of strength on thawing.Frost action occurs when moisture moves into the freezing zone of the soil.Temperature,texture,density,saturated hydraulic conductivity(Ksat),content of organic matter,and depth to the water table are the most important factors considered in evaluating the potential for frost action.It is assumed that the soil is not insulated by vegetation or snow and S not artificially drained.Silty and highly structured,clayey soils that have a high water table in winter are the most susceptible to frost action.Well drained,very gravelly,or very sandy soils are the least susceptible. Frost heave and low soil strength during thawing cause damage to pavements and other rigid structures. "Risk of corrosion"pertains to potential soil-Induced electrochemical or chemical action that corrodes or weakens uncoated steel or concrete.The rate of corrosion of uncoated steel is related to such factors as soil moisture,particle-size distribution,acidity,and electrical conductivity of the soil.The rate of corrosion of concrete is based mainly on the sulfate and sodium content,texture,moisture content,and acidity of the soil.Special site examination and design may be needed if the combination of factors results in a severe hazard of corrosion.The steel or concrete in Installations that intersect soil boundaries or soil layers is more susceptible to corrosion than the steel or concrete In installations that are entirely within one kind of soil or within one soil layer. For uncoated steel,the risk of corrosion,expressed as"low,""moderate,"or"high,"is based on soil drainage class,total acidity,electrical resistivity near field capacity,and electrical conductivity of the saturation extract. For concrete,the risk of corrosion also Is expressed as"low,""moderate,"or"high.°It is based on soil texture,acidity,and amount of sulfates in the saturation extract. USDA Natural Resources aConservation Service Tabular Data Version:6 Tabular Data Version Date:12/14/2005 Page 3 of 3 Agricultural Disposal of Wastewater by Irrigation and Overland Flow Weld County,Colorado,Southern Part [The information in this table indicates the dominant soil condition but does not eliminate the need for onsite investigation. The numbers in the value columns range from 0.01 to 1.00. The larger the value,the greater the potential limitation. The table shows only the top five limitations for any given soil. The soil may have additional limitations] pct. Disposal of wastewater by Overland flow of wastewater Map symbol of irrigation and soil name map unit Rating class and Rating class and limiting features value limiting features Value 42: Nunn 85 Very limited Somewhat limited Slow water 1.. Seepage 0.77 movement.:.: Filtering capacity 0.01 Haverson 9 Not rated Not rated Heldt 5 Not rated - Not rated Fluvaquentic Haplustolls 1 Not rated Not rated 78: Weld 80 Very limded Very limited Slow water 1. Seepage 1 movement Keith 9 Not rated Not rated Plainer 5 Not rated Not rated'. Wiley 5 Not rated Not rated Aquic Argmstolls. 1 - Not rated Not rated 82: Ndley 60 Not limited ` Very limited„ Seepage t Colby 30 Not limited Very limited Seepage 1 Heldt -. 4 Not rated Not rated-.' Weld 4 Not rated Not rated Aquic Argiustolls 1 Not rated Not rated Keith 1 Not rated Not rated USDA Natural Resources Tabular Data Version.6 Conservation Service Tabu ar Data Version Date:1274 2005 Page 1 of 2 Agricultural Disposal of Wastewater by Irrigation and Overland Flow Soil properties are important considerations in areas where soils are used as sites for the treatment and disposal of organic waste and wastewater.Selection of soils with properties that favor waste management can help to prevent environmental damage. This table shows the degree and kind of soil limitations affecting the treatment of wastewater,including municipal and food-processing wastewater and effluent from lagoons or storage ponds.Municipal wastewaters the waste stream from a municipality.It contains domestic waste and may contain industrial waste.It may have received primary or secondary treatment It is rarely untreated sewage.Food-processing wastewater results from the preparation of fruits,vegetables,milk,cheese,and meats for public consumption.In places it is high in content of sodium and chloride.In the context of this table,the effluent in lagoons and storage ponds is from facilities used to treat or store food-processing wastewater or domestic or animal waste.Domestic and food-processing wastewater is very dilute,and the effluent from the facilities that treat or store it commonly is very low in content of carbonaceous and nitrogenous material;the content of nitrogen commonly ranges from 10 to 30 milligrams per liter.The wastewater from animal waste treatment lagoons or storage ponds,however,has much higher concentrations of these materials,mainly because the manure has not been diluted as much as the domestic waste.The content of nitrogen in this wastewater generally ranges from 50 to 2,000 milligrams per liter.When wastewater is applied,checks should be made to ensure that nitrogen,heavy metals,and salts are not added in excessive amounts. The ratings in the table are for waste management systems that not only dispose of and treat wastewater but also are beneficial to crops. The ratings are both verbal and numerical.Rating class terms indicate the extent to which the soils are limited by all of the soil features that affect agricultural waste management.'Not limited' indicates that the soil has features that are very favorable for the specified use.Good performance and very low maintenance can be expected."Somewhat limited'indicates that the soil has features that are moderately favorable for the specified use.The limitations can be overcome or minimized by special planning,design,or installation.Fair performance and moderate maintenance can be expected.'Very limited'indicates that the soil has one or more features that are unfavorable for the specified use.The limitations generally cannot be overcome without major soil reclamation,special design,or expensive installation procedures.Poor performance and high maintenance can be expected. Numerical ratings in the tables indicate the severity of individual limitations.The ratings are shown as decimal fractions ranging from 0.01 to 1.00.They indicate gradations between the point at which a soil feature has the greatest negative impact on the use(1.00)and the point at which the soil feature is not a limitation(0.00). 'Disposal of wastewater by irrigation'not only disposes of municipal wastewater and wastewater from food-processing plants,lagoons,and storage ponds but also can improve crop production by increasing the amount of water available to crops.The ratings in the table are based on the soil properties that affect the design, construction,management,and performance of the irrigation system.The properties that affect design and management include the sodium adsorption ratio,depth to a water table,ponding,available water capacity,Ksat, slope,and flooding.The properties that affect construction include stones,cobbles,depth to bedrock or a cemented pen,depth to a water table,and ponding.The properties that affect performance include depth to bedrock or a cemented pan,bulk density,the sodium adsorption ratio,salinity,reaction,and the cation-exchange capacity,which is used to estimate the capacity of a soil to adsorb heavy metals.Permanently frozen soils are not suitable for disposal of wastewater by irrigation. 'Overland flow of wastewater's a process in which wastewater is applied to the upper reaches of sloped land and allowed to flow across vegetated surfaces,sometimes called terraces,to runoff-collection ditches.The length of the run generally is 150 to 300 feet.The application rate ranges from 2.5 to 16.0 inches per week.It commonly exceeds the rate needed for irrigation of cropland.The wastewater leaves solids and nutrients on the vegetated surfaces as it flows downslope in a thin film.Most of the water reaches the collection ditch,some is lost through evapotranspiration,and a small amount may percolate to the ground water. The ratings in the table are based on the soil properties that affect absorption,plant growth,microbial activity, and the design and construction of the system.Reaction and the cation-exchange capacity affect absorption. Reaction,salinity,and the sodium adsorption ratio affect plant growth and microbial activity.Slope,saturated hydraulic conductivity(Ksat),depth to a water table,ponding,flooding,depth to bedrock or a cemented pan, stones,and cobbles affect design and construction.Permanently frozen soils are unsuitable for waste treatment. USDA Natural Resources aTabular Data Version.6 Conservation Service Tabular Data Version Date:12/14/2005 Page 2 of 2 Agricultural Disposal of Wastewater by Rapid Infiltration and Slow Rate Treatment Weld County,Colorado,Southern Part [The information in this table indicates the dominant soil condition but does not eliminate the need for onsite investigation. The numbers in the value columns range from 0.01 to 1.00. The larger the value,the greater the poterdial limitation. The table shows only the top five limitations for any given soil. The soil may have additional limitations] Pct Rapid infiltration of wastewater Slow rate treatment of Map symbol of wastewater and soil name map unit - Rating class and Rating class and limiting features Value limiting features Value 42: Num 85 Very limited Somewhatimitad Slow water `- 7 . Slow water 094. movemert movement Filtering capacity 0.01 Haverson 9 Not rated Not rated Helot 5 Not rated Not rated Fluvaquentic Haplustolls 1 Not rated Not rated 78: Weld 80 Very limited Somewhat united Slow water 1 Slow water 0.94 ' movement movement Keith 9 Not rated Not rated Plainer 5 Not rated - Not rated Wiley 5 Not rated Not rated Aquic Argnutolls 1 Not rated Not rated 82: Wiley 60 - Very limited Not limited Slow water. 1 movement Colby 30 Very limited Not limited Slow water 1 movement Heldt 4 Not rated Not rated Weld 4 Not rated Not rated Aquic Argiustolis 1 Not rated Not rated Keith 1 Not rated Not rated USDA Natural Resources COIISCI'Yafloo Service Tabular Data Version:6 Tabular Data Version Date:12114/2005 Page 1 of 2 Agricultural Disposal of Wastewater by Rapid Infiltration and Slow Rate Treatment Soil properties are important considerations in areas where soils are used as sites for the treatment and disposal of organic waste and wastewater.Selection of soils with properties that favor waste management can help to prevent environmental damage. This table shows the degree and kind of soil limitations affecting the treatment of wastewater,including municipal and food-processing wastewater and effluent from lagoons or storage ponds.Municipal wastewater is the waste stream from a municipality.It contains domestic waste and may contain industrial waste.It may have received primary or secondary treatment.It is rarely untreated sewage.Food-processing wastewater results from the preparation of fruits,vegetables,milk,cheese,and meats for public consumption.In places it is high in content of sodium and chloride.In the context of this table,the effluent in lagoons and storage ponds is from facilities used to treat or store food-processing wastewater or domestic or animal waste.Domestic and food-processing wastewater is very dilute,and the effluent from the facilities that treat or store it commonly is very low in content of carbonaceous and nitrogenous material;the content of nitrogen commonly ranges from 10 to 30 milligrams per liter.The wastewater from animal waste treatment lagoons or storage ponds,however,has much higher concentrations of these materials,mainly because the manure has not been diluted as much as the domestic waste.The content of nitrogen in this wastewater generally ranges from 50 to 2,000 milligrams per liter.When wastewater is applied,checks should be made to ensure that nitrogen,heavy metals,and salts are not added in excessive amounts. The ratings in the table are for waste management systems that not only dispose of and treat wastewater but also are beneficial to crops. The ratings are both verbal and numerical.Rating class terms indicate the extent to which the soils are limited by all of the soil features that affect agricultural waste management.'Not limited indicates that the soil has features that are very favorable for the specified use.Good performance and very low maintenance can be expected.'Somewhat limited'indicates that the soil has features that are moderately favorable for the specified use.The limitations can be overcome or minimized by special planning,design,or installation.Fair performance and moderate maintenance can be expected.'Very limited'indicates that the soil has one or more features that are unfavorable for the specified use.The limitations generally cannot be overcome without major soil reclamation,special design,or expensive installation procedures.Poor performance and high maintenance can be expected. Numerical ratings in the tables indicate the severity of individual limitations.The ratings are shown as decimal fractions ranging from 0.01 to 1.00.They indicate gradations between the point at which a soil feature has the greatest negative impact on the use(1.00)and the point at which the soil feature is not a limitation(0.00). "Rapid infiltration of wastewater'is a process in which wastewater applied in a level basin at a rate of 4 to 120 inches per week percolates through the sod.The wastewater may eventually reach the ground water.The application rate commonly exceeds the rate needed for irrigation of cropland.Vegetation is not a necessary part of the treatment;hence,the basins may or may not be vegetated.The thickness of the soil material needed for proper treatment of the wastewater is more than 72 inches.As a result,geologic and hydrologic investigation is needed to ensure proper design and performance and to determine the risk of ground-water pollution. The ratings in the table are based on the soil properties that affect the risk of pollution and the design, construction,and performance of the system.Depth to a water table,ponding,flooding,and depth to bedrock or a cemented pan affect the risk of pollution and the design and construction of the system.Slope,stones,and cobbles also affect design and construction.Ksat and reaction affect performance.Permanently frozen soils are unsuitable for waste treatment. "Slow rate treatment of wastewater"is a process in which wastewater is applied to land at a rate normally between 0.5 inch and 4.0 inches per week.The application rate commonly exceeds the rate needed for irrigation of cropland.The applied wastewater is treated as it moves through the soil.Much of the treated water may percolate to the ground water,and some enters the atmosphere through evapotranspiration.The applied water generally is not allowed to run off the surface.Waterlogging is prevented either through control of the application rate or through the use of tile drains,or both. The ratings in the table are based on the soil properties that affect absorption,plant growth,microbial activity, erodibility,and the application of waste.The properties that affect absorption include the sodium adsorption ratio, depth to a water table,ponding,available water capacity,Ksat,depth to bedrock or a cemented pan,reaction,the cation-exchange capacity,and slope.Reaction,the sodium adsorption ratio,salinity,and bulk density affect plant growth and microbial activity.The wind erodibility group,the soil erosion factor K,and slope are considered in estimating the likelihood of wind erosion or water erosion.Stones,cobbles,a water table,ponding,and flooding can hinder the application of waste.Permanently frozen soils are unsuitable for waste treatment USDA Natural Resources Tabular Data Version:6 Conservation Service Tabular Data Version Date:12/142005 Page 2 of 2 ) ) ) Water Features Weld County,Colorado,Southern Part Water table Ponding Flooding I Map symbol Hydrologic arid soil name group surface runoff Month Upper limit Lower limit Surface depth Duration Frequency Duration Frequency Ft Ft Ft 42: Nunn C Low ; 4_Jgn1.-Dec — — None — None Haverson -- — Jan-Dec — -- None — None Heldt H*..,:.:.':.:;:.z.:,-;,':,!.• -- „— .:: . • None«.. — — None -- Jan-Dec,� Fluvaquentic Haplustolls — — Jan-Dec — -- None -- None 78: Weld C Low :; ;Jan Oec — — None --- None Keith -- — Jan-Dec -- -- None --- None Ratner — - ,Jan-Dec;;,:.. . — — None - None Wiley -- — Jan-Dec — --- None -- None Aquic Argiustolls — Jan-Dee — — None — None 82: Wiley B -.;...,,.,::,.:.,,Loan,:,::.:., Jan-Dec • — -- None — None Colby B Low Jan-Dec --- --- None -- None Heldt — — Jail-Dec — — None — None Weld -- -- Jan-Dec -- -- None -- None Aquic Argiustolls -- . . _ Jan-Dec — — None — None USDA Natural Resources Tabular Data Version:6 Conservation Service Tabular Data Version Date:12/14/2005 Page 1 of 4 ) / ) Water Features Weld County,Colorado,Southern Part Water table Ponding Flooding Map symbol Hydrologic Surface runoff Month and soil name group Upper limit Lower limit Surface depth Duration Frequency Duration Frequency Ft Ft Ft 82: Keith --- — Jan-Dec -- — None -- None ) USDA Natural Resources Tabular Data :6 Conservation Service Date: Y— Tabular Data Version Date:12/14/2005 Page 2 of 4 f ) ) Water Features This table gives estimates of various soil water features.The estimates are used in land use planning that involves engineering considerations. "Hydrologic soil groups"are based on estimates of runoff potential.Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation,are thoroughly wet,and receive precipitation from long-duration storms. The four hydrologic soil groups are: Group A. Soils having a high infiltration rate(low runoff potentiaft when thoroughly wet.These consist mainly of deep,well drained to excessively drained sands or gravelly sands.These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet.These consist chiefly of moderately deep or deep,moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture.These soils have a moderate rate of water transmission. Group C. Soils having a slow Infiltration rate when thoroughly wet.These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture.These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate(high runoff potential)when thoroughly wet.These consist chiefly of clays that have a high shrink-swell potential,soils that have a high water table, soils that have a claypan or clay layer at or near the surface,and soils that are shallow over nearly impervious material.These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group(AID,B/D,or C/D),the first letter is for drained areas and the second Is for undralned areas. "Surface runoff"refers to the loss of water from an area by flow over the land surface.Surface runoff classes are based on slope,climate,and vegetative cover.The concept indicates relative runoff for very specific conditions.It Is assumed that the surface of the soil is bare and that the retention of surface water resulting from irregularities in the ground surface is minimal.The classes are negligible, very low,low,medium,high,and very high. The"months"In the table indicate the portion of the year in which a water table,paneling,and/or flooding is most likely to be a concern. "Water table"refers to a saturated zone In the soil.The water features table indicates,by month,depth to the top("upper limit')and base("lower limit')of the saturated zone in most years.Estimates of the upper and lower limits are based mainly on observations of the water table at selected sites and on evidence of a saturated zone,namely grayish colors or mottles(redoximorphic features)in the soil.A saturated zone that lasts for less than a month Is not considered a water table. "Ponding"is standing water in a closed depression.Unless a drainage system is installed,the water is removed only by percolation,transpiration,or evaporation.The table indicates"surface water depth"and the"duration"and"frequency"of ponding.Duration is expressed as"very brief"if less than 2 days,"brief'if 2 to 7 days,"long"if 7 to 30 days,and"very long"if more than 30 days.Frequency is expressed as none,rare,occasional,and frequent."None"means that ponding is not probable;"rare"that it is unlikely but possible under unusual weather conditions(the chance of ponding is nearly 0 percent to 5 percent In any year);"occasional"that it occurs,on the average,once or less in 2 years(the chance of ponding is 5 to 50 percent in any year);and"frequent"that it occurs,on the average, more than once In 2 years(the chance of ponding is more than 50 percent in any year). "Flooding"is the temporary inundation of an area caused by overflowing streams,by runoff from adjacent slopes,or by tides.Water standing for short periods after rainfall or snowmelt is not considered flooding,and water standing in swamps and marshes is considered ponding rather than flooding. "Duration"and'frequency are estimated.Duration is expressed as"extremely brief"if 0.1 hour to 4 hours,"very brief'if 4 hours to 2 days,"brief"if 2 to 7 days,"long"if 7 to 30 days,and"very long"if more than 30 days.Frequency is expressed as none,very rare,rare,occasional,frequent,and very frequent."None"means that flooding is not probable;"very rare"that it is very unlikely but possible under extremely unusual weather conditions(the chance of flooding is less than 1 percent in any year);"rare"that it is unlikely but possible under unusual weather conditions(the chance of flooding is 1 to 5 percent in any year);"occasional"that it occurs infrequently under normal weather conditions(the chance of flooding is 5 to 50 percent in any year);"frequent"that it is likely to occur often under normal weather conditions(the chance of flooding is more than 50 percent in any year but is less than 50 percent in all months in any year);and"very frequent"that it is likely to occur very often under normal weather conditions(the chance of flooding is more than 50 percent In all months of any year). The information is based on evidence in the soil profile,namely thin strata of gravel,sand,silt,or clay deposited by floodwater;irregular decrease in organic matter content with increasing depth;and little or no horizon development. Also considered are local Information about the extent and levels of flooding and the relation of each soil on the landscape to historic floods.Information on the extent of flooding based on soil data is less specific than that provided by detailed engineering surveys that delineate flood-prone areas at specific flood frequency levels. USDA Natural Resources - Conservation Service Tabular Data Version:6 Tabular Data Version Date:12/14/2005 Page 3 of 4 Ponds and Embankments Weld County,Colorado,Southern Part [The information in this table indicates the dominant soil condition but does not eliminate the need for onsite investigation. The numbers in the value columns range from 0.01 to 1.00. The larger the value,the greater the potential limitation. The table shows only the top five limitations for any given soil. The soil may have additional limitations] Pct Pond reservoir areas Embankments,dikes,and Map symbol of levees Aquifer-fed excavated ponds and soil name map unit Rating class and Value Rating class and Rating class and limiting features limiting features Value limiting features Value 42: Numt 85 Very limited Somewhat imited Very limited Seepage 1 Piping 0.36 Depth to water y.... Seepage 0.03 78: Wed:.. 80 Somewhat tmtted Somewhat limited Very'limited Seepage 0.7 Piping - 0.99 Depth to water 1. . 82: Wiley 60 Somewhat limited Somewhat tmitad Very limited Seepage 0.7 Piping 077 Depth to water 1 Colby 30 Somewhat limited Very limited Very limited Seepage 0.7 Piping 1 Depth to water 1 USDANatural Resources This Tapal shows coy the major soils in each map um_plies may axis! aConservation Service Tabular Data Version:6 Tabular Data Version Date:12/14/2005 Page 1 of 1 Hello