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Home My WebLink About3.0 Soils & Geotechnical Infochen and associates CONSULTING GEOTECHNICAL ENGINEERS 5O8O RO. 15. GLENWOOO SPRINGS, COLORADO 81601 303/9,15-7458 - ;l &,rq t. _ ' 'J,T iiiU ,"t,,1 .. J '_)., ,, February 28, 1983 '""'-;r) Subject: Preliminary Site Evaluation, for Property Adjoining ExistLng House and Taxidermy Shop at 7916 Hlghway 82, South of Glenwood Springs, Garfield County, Colorado Job No. 25,347 Don Weachtler 7916 Highway 82 Glenwood Springs CO 81601 Dear Sir: As requested, we have completed a preliminary geotechnical evaluat.ion of the property situated in about the south half of Lot l-5, Seetion 7 T7S-R8W of the 6th Prj.ncipal Meridian, Garfield County, Colorado, adjoining the existing taxidermy shop at 79L6 Highway 82. The preliminary evaluation includes a review of area geology, topography and visual observations at the site. The site is situated on a relatively gentJ-e slope between the very steep east valley side and the Roaring Fork River, on the northeast corner of the intersection on eount"gg_}IO and Col-orado Highway 82 E. Frontage Road. outcroppings of the Eagle Valley Evarporite Formation were observed in the steep valley slope to the east of the site. The existing cut along the north side of County Road 110 exposes weathered gypsiferous shale steeply bedded downward to the north. A recent water line cut below the County Road exposes silty all-uvial gravels. A sma11 4 to 5 foot high cut adjacent the frontage road which borders the western side of the si.te exposes gravelly silt colluvium. The silts exposed appear to underlie the majority of the site and tend to be gypsiferous and contain some shale fragments. A large ephemeral drainage, whieh has eroded into bedrock and is bordered by near vertical- exposures of gypsiferous shale, is situated in the valley side slope to Ehe east of the site and tends to flow to the south tovrards Cattle Creek. An irrigatlon ditch about 3 to 5 feet in depth and irnmediately east of the site roughly para1le1s the eastern site boundary. This ditch has reportedly overflowed its banks in the past resultlng in mlnor flooding of portions of the slte. Dralnage at the site is generally from east to hrest. Sqll,Agg_glles across the site are generally on the order of. L0"4 and flatter, exceptin the road cut alon[ the southwest corner 5FE63 site imuediately idiacent the Frontage Road where 2:1 (horizontaL to vertical) slopes exist. OFFICES: CASPER o COLORAOO SPRINGS . DENVER . SALT LAKE CITY pen tr,leachtler February 28, 1983 Page Two In our opinion, geologic condi.tions at the stte should nS_t neke deve1oomentinfeasib1e.BasedonourobservationsweEffi", pffinditionsexistwhichcou1dimpactthesiteandshou1d be evaluated during final development planning of the parcel. These are: flooding from the adjacent irrigation ditch; hydrocompaction of the silt colluvium; corrossivity of the soils, and debris flow of the natural drainage east of the site. Of these- debr te due to the obseTTe ilrainage location with respEct to the site and its orientati-on. We anticipate the remaining possible seologic impacts-can be mitigated by gooa .rrgir,..ri.,ffi. rr-^*;"t". TLi€.- nvestisatio This report is preliminary in nature and is based so1ely on observa- tions of the present surficial conditions at the site and a review of general geology mapping. Subsoil conditions rvhj-ch would impact foundation design may vary significantly with depth and change or contradict the conclusions i-n this report. A detailed geotechnical i-nvestigation is reconrnended to provide more specific design recomnendations for use in final development p1ans. If you have any questions or if v/e can be of furEher service, please ca11. Very truly yours, CHEN AND ASSOCIAI INC. IilB/ko Rev. By: S.L.P. m)"Hm(4,: \" - 1i+; 1r:222 , "l a-- ca* -:" i.(, c ,r;,;nrnnrt)*8,Wf#tils ASSOCIATES, Michael xtd. loD 8eIrc x \ l.'68 51 5do 125'. gq, :'!,U',' b'# 8/EL ssD--Armells obbly sanQy loam, 6 to 12 [Ercent slotrns. Ihis map urit is on uplard benches, fmt slopes, ard alluvial fans. Elevatian is 61000 to 7,000 feet. the average annual precipitation is 13 to 16 inches, tft€ average annual air temtrnrature is 42 to 46 degrees F, ard tJre average frcst-free priod is 95 to 105 days. Ttre native vegetation is nninly grasses, forbs, ard $Joody shrubs. Included in this unit are snall areas of itbrvaL, Goslin and Tridell soils. The l"lorval and C;oslin soils harc slopes of less than 12 percent. Included areas nake up about 15 percent of Ure tota.L acreage. Ttre Armells soil is deep ard weIL drained. It formed in alluvium derived dcrninantly frsn redbed sandstone ard shale intermixed with gypsiferous material. \rpically, th€ surface layer is reddish brown cobbly sandy loam 3 inches thick. The upper II inches of the underlying nnterial is gravelly 1oam. the next 12 inches is very gravelly loam. The next 34 inches to a deptkr of 60 inches or rrDre is very coboly fine sandy loan. The soil is calcareous throughout tre profile. The anrrunt of stones ard cobbles increases with depthr. Some flagstones are in Ure pr<.:file in scrne areas. Permeability of the Armells soil is nroderately rapid. Available water ca1:acity is low. Effective rootirrg depth 60 inches or ITore. R:noff is nedium, ard tle hazard of water erosion is moderate. Most areas of this unit are u:sed for rangeland. A few areas are used for homesite develolment ard for wildlife habitat. Ihe trntential plant ocnmunity on this unit is rnainly lvestern rttreatgrass, Irdian ricegrass, muttongrass, ncuntain big sagebrush, and Utalt serviceberry. I,leedleandthread, buglas rabbitbrush, srluawapple, ard scattered Lltatr junitrEr ocnmonly are also present in the potential plant conrnunity. Thre average annual poduction of air-dry vegetation is ar:out 900 trnunds [Er acre. If the range conditicn deteriorates, rrcuntain big sagebrush, buglas rabbit"r:ush, cheatgrass, ad annual weeds increase. a)o-rt stEu.I l,lanagenent practices suitable for use cn tiris unit are protrEr grazing use ard a planned grazirg system. The suitability of this unit for rangeland seeding is Iow. The tnain limitations for seedirg are stones on the surface. This soil is limited for livestock waterirg pords ard other imtrnundments because of the seepage potential. If the Armells soil is used for }ptnesite developnent, Ure main linitations are the hazard of erosion, stone in tl-re soil, and tlre susceptibility to piprrq arri frost heaving. Areas in this unit adjacent to hillsides are occasionally affected by nrnoff, wfrich rnay also be accornlnnied [z nnvement. of rod< debris. Preservirr; the existirg plant cover during construction helps to .control erosion. Erosion is a hazard in the steetrEr areas. O:tIy tte part. of the site that is used fe qcnstructiqr should be disturbed. HnovaL of gravel and rpbbles in disturbed areas is reeded for best results when landscaping, lnrticularly in areas used for lawns. This map unit is in capability sr:bclass VIIe, ronirrigated. It is in Ioantlz Slopes range site. SOIL (:IIAMCTIiRI STICS .t !r..ptlr to Red,rock 'i'r'x I rrt't' Srrr f acc lirrl'r;oll Srrlrr; t ratun (surface) Flood llazard llytlrologtc Group Gravel Road f 111 OTIIER SOIL FEATURES n€irratc+y doop ovor cobble, stono cobbly loam cobbly sandv 1oan, flaggy sandy loam vI,r.y fl af iiv sandv loam tt'r Lf Ied/MSllO Claseiflcatlon: lIL, GII; A-4, A-z I'r'rmeablllty (below 2 feet) : rapid Ptr rcr-,Dt Coarse Fragments (nravel, cobble, stone) : 35 to 80 porcont So11 Reactlon (pll). 7.9 - 8.4 Shrlnk-Swell Potential : lorv Poterrtlal Froet Actlon corroslvltr:llill"." :ilI;' DECRNE & KIND OF LIUITATIONS(o ts Sllghc, M la Moderate, S Ls Severe) Septlc Tank Abaorptlon Fields :S-l6rlFstones Sewage Lagoone : S - seopago, large stonos Sanltary Landflll - Trench : S - seepago, largo stones -Area :S-soopago ShallowExcavatlons :S-largestonos Dwelltnga w/basementa :S-largestones w/o basementa : M - 1ar69 stones Local Roade and Streetg : S - larg,o stones SUITABILITY AS A SOURCE OF.... Dally Cover for Landflll : Poor - Iarge stonos, seopage Topsoll : Poor - large stonos, thln layer Sand I Unsuited : low' : none :B : Unsulted : Poor - larBe stonee ,'ADVANCI! COPY STIBJECT To CIIANGEI. NoT To BB USED IN PIiCE oF oN-sITIi INVI:STIGATION. f\{? z i7 wa St,uL{' qqf -tffi'l sc5 u.t. oaa^ir{rt o, ^o.tolr COB.e^r6. SOIL SURVEY INTERPRETATIONS