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Home My WebLink About20190550.tiff`` Oct 2) 1 i 0222p arlene parsons 970-221-5759 p.2 July 30, 2002 Mr. Bob Parsons 40455 Skylark Drive Fort Collins, Colorado 80524 .e: Geologic Evaluation Peace Haven Estates Weld o ty, Colorado EEC Project No. 1022125 Mr. Parsons: EARTH ENGINEERING CONSULTANTS, INC Consultants, Inc.(EEC)personnel have completed the geologic evaluation you Earth Engineering requested for the referenced project. That evaluation was completed by reviewing readily available data concerning soil and groundwater conditions at the site, principally through review of United �' States Geologic Society (USGS)/Colorado Geologic Society (CGS) and Department of Apiculture Soil Conservation Service CS published information. A. listing of the references reviewedas a part of the geologic hazard study is included with this resort. We understand the lots at the referenced project will be at least 5 acres in size, therefore no percolation testing was completed as • o� a part of this evaluation. The Peace Haven Estates project is located in Section 10, T7N, Y 67 of the es P.I. in Weld � ro.� County, Colorado. The development parcel includes approximately 48.5 acres. Site drainage is to the so utheast with total elevation change across the site on the order of 30 feet. A dial indicating the approximate location of the development is included with this report. The attached soil classification map includes demarcation of those soil groupings identified on the site by SCS soil descriptionsp maps. SCS of those soil types ate provided with this report. In general, the near surface soils at this site appear to be a blend of low plasticity clay loam and fine sandy low information indicates the property would be expected to have -onndwater at depths soils. The SCS tnfo�rma� of 5 to 20 feet. According to the geologic maps of the area, the surficial materials mapped consist of eolean (wind � deposited) soils from the Upper Holocene and Pleistocene geologic period. The eolean materials pp overlie the Upper Transition ` ` Member of the Pierre Shale bedrock formation, The Upper Transition Member consists of sandstone sandy . with shale layers. According to SCS data, depth to bedrock in CENTote FOR AovASCCO TECHNOLOGY 2301 ReSEARCH BOULEVARD6 Sarre 104 FORT COLLINS, COLORADO 8O526 (97 0) 224-1 522 Wax) 224-45611 Oat 27 11 02:32p arlene parsons 970-221-5759 103 EEC Project No. 1021125 My 30} 2002 Page 2 Est ecr ng Consultants. Inc. the Olney series is greater than 60 inches; however, bedrock in the Renohill series could be encountered between 20 and 40 inches below present site grades. Based on our review above, expect the near surface soils could be used for of the site as outlined support of h • tl loaded residential structures. The near surface soils appear to exhibit a low with variation moisture conten • however, the euoh�l s�+e's may potential for volume change variation in m. is exhibit moderate to high swell potential. otential. CS information medicates the Olney series would be expected to exhibit acceptabpercolation ercolation rates for on -site septic systems; however, the Renohill series may exhibit slow percolation rates or shallow bedrock. During our review of available site data, we did not identify potential geologic hazards as outlined c•n1-1.B 1041. Shallow bedrock and slower percolation rates would be expected in the area of the , Renohill Series. addition, we did not identify economically recoverable ntireral resources as defined in H.R. 1041 at this site. The evaluation for this ` report was based on a. review of readily available public information for the property. Specific site data should be developed for individual residences and septic fields once die locations of those improvements are identified. We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the enclosed information or require additional information, please do not hesitate to contact us. Very truly yours, EInca�. ... � eermgConsultants, i��i �� +.�'�Jw is .*1 ;}fw.coley? P.E. Project Engineer `. Out VI 't i 02, p ar Ter a par bur is &TO -22i -5759 P.4 SCS SOIL SERIES MAP PEACE HAVEN ESTATES - WELD COUNTY, COLORADO PROJECT N0:1022125 DATE: JULY 2002 Oct 27 11 02:33p arlene parsons 970-221-5759 p, 5 47 —Caney fine sandy loam, 1 to 3 percent slopes. This is a deep, well drained soil on plains at elevationsof 4,600 to £200 feet. It fanned in mixed ont a h deposits Included in mapping are small areas of soils that have a dark surface layer. Some mall leveled areas are also in- c,lutded, soil Typically the surface layer of this Olneygrayish brown fine sandy loam about 10 inches thick. The subsoil is yellowish brown and very pale brown sandy clay loam about 14 inches thick. The substastiim to a depth of 60 inches is very pale brown, calcareous fine say loam. Permeability and available water capacity are moderate. The effective rooting depth is 60 inches or more. Surfact runoff is medium, and the lion hazard la low. In irrigated areas this son is suited to all crops com- monly grown in the area, including corn, sugar beets. beans, alfalfa, small grain, potatoes, and onions. An exam - pie of a suitable cropping item is 3 to 4 yea= of alfalfa followed by corn, corn far silage, sugar beets, small grain, nr beans. Lama leveling, ditch lining, and instaBing pipelines may be needed for proper water application. li methods of irrigation are suitable, but funs ow irrigation is the snout common. Barnyard manure and comma] fer- tilizer are needed for top yields. In no irrigated areas this sun is suited to winter wheat, barley, and sorghum. Most of the acreage is planted to winter wheat. The predicted average yield is 28 bushels per acre. The soil is summer Bowed in alternate years to allow moisture ateuraulation. Generally precipitation is too low for beneficialbeneficialuse offertilizer, Stubble much farming, striperopping, and minimum til- lage are needed to control soil blowing and water erosion. Terracing also may be needed to control water erosion. The potential native vegetation on this range site is dominated by sand bluesm. sand reedgrass, and blue grams, Needieandtbread, switchgrass, sideaats grama, and western trheatgrass are also prominent Potential production ranges from 2,20O pounds per acre in favora- bl$ years Co 1,31 0 pounds in unfavorable yews. As range condition deteriorates, the sand bluest►, sand ree gran . �,�� grarna, sand dropseed, and swxt�►�rass decrease and sses 3avede and sand sage increase. s.nnual weeds and � the site as range condition becomes poorer. Management cf vegetation on this soil should be based n tarn half and leaving ball of the total annual p uc- o g tion. Seeding is desirable if the range is in poor condition.�switchgr�, sideaats Sand lalue�te�, sand re�i�� - grants, blue ,grams, and pubescent wheatgrass are ble for seeding. The grass selected should meet the seasonal requirements of livestock. It can be seeded into a clean, firm sorghum stubbier or it csz be drilled into a firm prepared seedbeds Seeding early in spring has proven most successful. generally Windbreaks and environmental plantings suited to this soi Soil blowing, the principal hazard in establishing trees and shrubs, can be controlled bycul- tivating only in the tree row and by leaving a strip of vegetation between the rows. Supplemental irrigation may be needed at the time of planting and during dry periods. Trees that are best suited and have good survival are Rocky Mountain juniper, eastern redeedar, ponderosa per, Siberianehu, Ruseian-olive, and hackberry. The ebrubs best suited are skun bush mac. lilac,and Siberi- an peaslrub. Wildlife is an important secondary use of this soil. The cropland areas provide favorable habitat for ring-neeked pheasant and mourning dove. Many nongaree species can be att.I-acted by establishing areas for nesting and escape cover_ For pheasants, undisturbed nesting cover is esaeb- tial and should be included in plans for hahatar develop - meat, especially in' areas of intensive agriculture. Range- land wildlife. for example, the pronghorn antelope, can be attracted by developing livestock watering- facilities, managing livestock razing, and reseeding where needed Rapid expansion of Greeley and the grounding area has resulted in urbanization of much of the Olney soils This soil has good potential for urban and recreation development. The only Ming feature is the moderateb rapid permeability in the substratum. which causes a hazard of ground water contamination from sewage lagoons. Lawns, shraba, and trees grow wet Cavebflity subclass Ile irrigated, We nonirrigaited- Sandy Plains range site. USDA SOIL CONSERVATION SERVICE SOIL GROUP DESCRIPTION OLNEY SERIES nrth rncrinaririnn rrrncifltatttc OCt it 11 Uz:u4p arlene parsons ppb - -Olney fuze sanely loam, 3 to 5 percent slopes. This is a deep, well drained soil on plains at elevations of 4,600 to 5,20D feet It formed in mixed outwash deposits. Included in mapping are small areas of sans that have a dark surface layer and small areas of sus that have sandstone and shale within a depth of 60 inches. Typically the surface layer of this Olney soil is grayish brown fine sandy clay. loam about 8 inches thick. The aub- soil is yellowish brown and very pale brown fine sandy loam ut 12 incites thick. The substratumsubstrahun to a depth of 80 inches is vary pale brown, calcareous fine sandy loam. Permeability and available water capacity are moderate. The effective rooting depth it 60 inc.hes or mare. Surface runoff is medium, and the erosion hazard is Low. in Fated areas this soil is suited to the crops - monly grown in the area. Perennial grasses and alfalfa or close grown crops should be grown at least 50 percent of the time. Contour ditches and corrugadons can be used in irrigating close grown crops and pastwe. Furrows, eon - tour furrows, and cross slope furrows are suitable for row crops. Sprinkler irrigation s also desirable. Keeping tan, loge to a minimum and atili ing, erop residue help to con- trol erosion. Maintaining fertility is important. Grope respond to applications of phosphorus and nitrogen,. In nonirrigated areas this soil is salted to winter wheat, barley, and sorghur. Most of the acreage is planted to winter wheat The predicted average- yield is 25 bushels per acre. The soil is summer fallowed in alternate years to mow moisture accumulation. Generally precipitation is too tow for beneficial use of fertgzer. Stubble mulch farming, smo g, and rai., imw n til- lage needed to control soil blowing and water erosion - Terracing also may be needed to control water erosion. The potential native vegetation on this range site is dominated by sand bluest, sand reedgrass, - anti blue graima. Needleandthread, swigrasa, skleitts grams, and western wheatgrass are also prnmiuen't. Potential production ranges from P� pounds per acre in f verai bye years to 1,880 pounds in unfavorable years. is condi- tion deteriorates. aand bbiestein, sand reedgrass, and switchgrass decrease € nd !fie grams, sand dropaeed, and sand sage Increase. Annual weeds and grasses invade the site as range condition becoonee poorer. Management of vegetation on this soil should be based on tag half and leaving half of the total anal produc- tion. Seeding is desirable if the range is in poor condition. Sand blttm, sand reedgrass, switchgnme,its grama, blue grams, pubescent wheat , and crested wbeatgrats are suitable for seeding. The grass selected should meet the seasonal requirements of hoc It, can be seeded into a clean.. firm Sorg um stubble, or it an be drilled into a 5xen prepared shed. Seeding early in spring has proven most 'Windbreaks and environmental p]antingsare generally suited to this sod. Soil blowing, the principal hazard in establishing rees and shrubs, can be tontrailed by al- tdvatang only in the tree row and by leaving a strip of vegetation ton tween the rows. Supplemental gation lancing and during dry may be ceded at the time of planting survivalcei ds. Trees are best suited and are Rocky Mountain japer, eastern redtmdar, ponderosa ian elm, l ussian-olive, and blackberry. The pine, bar � bursh sumac, lilac, and Siberi- an peaae is secondary use of this soil. The Wildlife an important necked cropland areas provide favorable; habitat for ring - pheasant and merino.' g dove_ Many nay me specs esin be attracted by establishing areas for naming and escape cover. For pheasants, undisturbed nesting cover is essen- tial and should be included in plans for habitat develop- ment,- especially in areas of intensive agriculture. F.an - land wildlife, for example, the pronghorn antelope, can be attracted by developing livestock watering fties, and reseeding where needed. managinglivestockng� a ax�L the surrounding area Rapid expansion of Greeley much of this Olney soil. has resulted in urbanization ofurbanand recreational The soil has good potent for development. The only limidng feature is the moderately stpid per ability in the substratum, which causes a hazard of ground water contamination from sewage lagoons. Lavms, sb bs, and trees grew welt. Capability subclass 11Th irrigated, We Sandy Plains range site. USDA SOIL CONSERVATION SERVICE SOIL OUP DESCRIPTION LNEY SERIES Earth Engineering Consultants Oct 27 11 02:35p arlene parsons 970-221-5759 - 5757—Renohi11 day loam, 3 to 9 .percent slopes. This is a moderately deep, well drained soil on upland hills and ridges at elevations of 4,850 to 5,200 feet It formed in residuum from shale. included in mapping are small areas of soils that have shale deeper than 40 Inches. Typically the surface layer is grayish brown clay loans about 9 inches thick The subsoil is grayish brown and pale brown clay loam about 12 inches thick The sub -- s pale brown day loam. Shale is at a depth of about 29 inches. Perraeablity is slow. Available water capacity is moderate- The effective rooting depth is 20 to 40 inches. Surface runoff is medium to rapid, and the erasion hazard is moderate. This soil is suited to limited cropping. Intensive cropping is hazardous because of erosion.. The cropping system should be limited to such close grown crops as al- falfa, wheat, and barley. The sad also is suited to rigated pasture- A suitable cropping system is 3 to 4 years of alfalfa followed by 2 years of corn and small grain and alfalfa seeded with a nurse crop. Closely spaced ed centaur ditches can be used in irrigating close groom craps. Contour f crows should be used for row crops. Applications of barnyard manure and cornmer- dial fertilizer help to maintain good production. Keeping ti lage to a minimum and utilizing crop residue are irnpore taut, The potential native vegetation is dominated by western wheatgrass and blue grams. Buffalograss is also present. Potent -jai production nngss from 1,000 ponnds per acre in favorable years to 600 pounds in unfavorable years. As range condition deteriorates, a blue grama-burf- f alo rass sod Sonia. Undesirable weeds and aan uak ill" vide the site as range condition becomes poorer. ManageMent of vegetation on this soil sbauW be based on taking half and leaving half of the total annuals produc- tion. Range pitting can reduce =muff. Seeding is desirable if the range is in poor condition. Western wheatgr-aas, blue gnawsideoats grama« bu f'alograse, pubescent wheacgrass, and crested yrbeatgrass are suitable forseed- ing. The grass selected should meet the seminal tasnts of livestock. It eau be seeded into a clean.. firm sorghum stubble, or it can be drilled into a farm prepaid seedbed. Seeding early in spring has proven most sum f�L Windbreaks and environmental plantings are generally not suited to this soil. Onsite investigation is needed to determine if pegs are feasible. Supplemental water is needed for successful plantings. Wildlife is an important secondary use of this soilThe eropLand areas provide favorable habitat for ring-necked pheasant and mourning don.. Many nee species can be attracted by establishing areas for nesting and escape cover. For pheasants, undisturbed nesting cover is essen- tial and should be included in plans for habitat develop- ment, especially in area& of intensive agriculture. land wildlife, for example, the pronghorn antelope, car be attracted by developing livestock watering facades, managing livestock grazing, and reseeding where needed. This soil has poor potential for urban and recreational development The chief limiting features are the underly- ing shale, the how strength, and the moderate to high shrink swell. These features present severe problems in dwelling and road construction and in nee of septic tank absorption Arida and sewage lagoons Capability subclass e irrigated, Vie agonirriga d; Clayey Plains range sits. USDA SOIL CONSERVATION SERVICE SOIL GROUP" DESCRIPTICIN NOIRE.L SERIES VP a at 4 •Gis e Om P. PO tan 444 Ins " a an ti #r In +air+ k A. r , Vir ►iiviIc Pai �iEo iIw-tt s -, n %Au F,.v REFERENCES L Colton R.B . and Harold It Fitch, 1974, Map %towing agLerielial Lowyss_ofecataS act „ . x, slc .ock e ate in the °udder- oI1ins-+ reel yr AreaSit nee tban orridar. olorado: U.S _ Geological Survey Miscellaneous Investigation Series Map 1455-D.. . Colton R. B ., Halligan,n, J.A.., and Anderson, L.1 ., 1975, Preliminary . of Landslide D ace ley I,~ °_ 'pg, ra�ngle._ : U.S. Geological Survey Miscellaneous Investigation Series Map -704. 3 . McCain, J. and Hotchkiss, W.R., 1975 , Map Showing FloodAtone Area5s .l uld - Fort .ot1 - ree v nt R T olora &: US . Geological Survey Miscellaneous Investigation Series Map 1-855-E. 4. Colton .$., 1978, Geolqgic Map of the koulder-Fort- ctillinsectreStS Colorado: US. Geological Survey Miscellaneous investigation Series Map 1-955-G. 5 . Hershey L.A. and Schneider, Jr. PA., 1972, "c a ft e over Cace La Poudre River Basins Northreenl Colorado: US . Geologies. Survey Ivliscellaneous Investigation Series Map 1-687. 6. Hillier D. and Schneider, Jr. PA, 1979, flwth to the Water ` I i the ou e -� o cguhztCicckyea. Front R. roan cr .tor. Coco 11.S. Geological Survey Miscellaneous Investigation Series Map 1-855-1. 7. United States Department of Agriculture Soil Conservation Service and Forest Service in Cooperation with Colorado Agricultural Experimeat Station, 1980, £Qi! urve of Weld uj o or d Maps 239412/3 . 4 Hello