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Home My WebLink AboutFOSSIL LAKE P.U.D. - PRELIMINARY - 33-01D1 - SUBMITTAL DOCUMENTS - ROUND 1 - GEOTECHNICAL (SOILS) REPORT74 36 j'z : , 35 74. f 73 36 , ' Y 74 • �r .�..� - - ;73 35 �7.4 .£ Y � ar to _ �� water y�' ,,, E J tt' • D/TCH 73 9 74 1. 34 74 9 00 76 0O 76 n. 0 00 :>... DITCH t , 34 73�. 1' 34,,r 74 s .73 74 73 40 ° 30 115 76 4/0 118 ' 118 a �� < c% VN ' 76 115 Fs _ 74 ' 49 27 FOSSIL LAKE FARM 49. .,.. . 7 4 FOSSIL CREEK 118 119 RESERVOIR SCS SOIL SURVEY ' Fossil Lake Farm Larimer County, Colorado ' EEC Project No: 1941007 Sheet No 1 of 7 Earth Engineering Consulta Earth Engioccring Consultants, Inc. Proposed Fossil Lake Farm Development February 18, 1994 Page 5 We. appreciate the opportunity .to be of service to you on this project. If you have any questions concerning this report, or if we can be of further service to you in any other way, please do not hesitate to contact us. Very truly yours, Earth Engineering Consultants, Inc. Reviewed by: Lester L. Litton, P.E. Curtiss L. Palin, P.E. Principal Principal ` Earth Engineering Consultants, Inc. Proposed Fossil Lake Farm Development February 18, 1994 Page 4 Maximum site slopes appear to be less than 2 percent. Geologic hazards due to mass movement, -such as earth flows or landslides, are not anticipated with the gentle slopes. Seismic activity in this area is also expected to be low. The geologic conditions at this site are such that economically recoverable deposits of coal, sand, gravel or quarry rock would not be expected. In addition, radioactive materials are not generally found in the Pierre Shale formation. ENVIRONMENTAL MAINTENANCE A majority of the Fossil Lake property is currently used for agricultural purposes. The present use of the property includes operation of a cattle feedlot on the east portion of the site. The feedlot is located near the Fossil Creek Reservoir Inlet Ditch. Natural streams, lakes or other unique natural features were not observed during our site visit. The Fossil Creek Reservoir is an irrigation water storage reservoir. The site topography slopes gently to the south, toward the Fossil Creek Reservoir. Reportedly, two irrigation ditches traverse the property. Seepage from these ditches may create artificial groundwater recharge and result in raising the groundwater table in the immediate areas of the ditches. Depending on current groundwater levels, lining of the ditches may be required to reduce the artificial recharge impact to the development. In our opinion, construction of this development will not have adverse environmental impact to the existing streams, lakes, vegetation or other natural site features. Removal of the feedlot from adjacent to the Fossil Creek Reservoir inlet may lessen the potential for contamination of the storage reservoir. Earth Engineering Consultants, Inc. Proposed Fossil Lake Farm Development February 18, 1994 Page 3 The near surface soils over a portion of this site are eolian in nature and may exhibit relatively low in -place densities. Consolidation of these materials can occur upon wetting. Designing for relatively light foundation bearing pressures and, in some cases, over -excavating and backfilling below structure are common design/construction techniques in eolian soil areas. Careful development of adequate surface drainage will be necessary to prevent wetting of the subgrades. Erosion of the surface soils could occur either during or after construction if the site is stripped and the near surface materials are exposed to weathering. SITE GEOLOGY The Fort Collins area is located near the contact of the Front Range of the southern Rocky Mountain Physiographic Province in the Colorado Piedmont Section of the Great Plains Physiographic Region. The Colorado Piedmont was formed during the late Tertiary and Early Quaternary geologic period, approximately 65 million years ago. The Colorado Piedmont is a broad erosional trench which separates the Southern Rocky Mountains from the High Plains. Uplift of the present day Front Range and associated formation of the Denver Basin to the east occurred during the late Mesozoic and Early Cenozoic geologic periods, approximately 70 million years ago. The current site topography is characterized by relatively flat uplands and broad valleys. According to CGS published information, the Fossil Lake site is underlain by the Pierre Shale formation. The Pierre Shale was deposited during the Upper Cretaceous period and is comprised of varying zones of claystone, siltstone and sandstone. The claystone portions of the formation maybe expansive. I ' Proposed Fossil Lake Farm Development Earth Engiuceriug Consultants, Inc. February 18, 1994 Page 2 A senior project engineer from EEC performed visual reconnaissance of the site on February 17, 1994. The site reconnaissance included ' general observation of site features and the surrounding area. As a part of our. evaluation of this site, general site information ' from the Soil Conservation Service (SCS) and Colorado Geologic Society (CGS) was reviewed. A diagram of the SCS soil survey map ' for the site and associated written descriptions of the soil classifications are included with this report. Most of the project site is presently irrigated cropland. The Mail Creek Ditch enters the property at the half -section line on the ' west and flows along the 1/4 section lines to the Fossil Creek Reservoir. The Muskrat Ditch reportedly enters the property towards the northwest section corner and flows generally west to east across the property. Signs of a major water conveying ditch were not apparent at the time of our field review of the property. ' The Fossil Creek Reservoir inlet ditch flows south along the south quarter mile of the east property line. A natural drainageway ' flows through the northeast portion of the site to the Fossil Creek Reservoir. ' SITE EVALUATION ' SOILS ' According to available SCS information, the site soils are comprised of predominantly cohesive materials. A portion of those materials appear to be moderately plastic soils although expansive residual bedrock does not appear likely near ground surface. According to the SCS information, shallow bedrock may be ' encountered in limited areas near the Fossil Creek Reservoir. 1 I .1 ' 'February 18, 1994 ' Everitt Companies 3000 South College Fort -Collins., .00 _80525 ' ATTN:::Mr. Tom.:Livingston DA, EARTH ENGINEERIN( CONSULTANTS, INC. Re: Concept Technical Review Evaluation Concerning Soils, Geology and Environmental Maintenance Proposed Fossil Lake Farm Development ' ... Larimer County, Colorado Project No. 1941007 Mr..ivingstan: :Ear_th- Engineering :.Consultants, Inc. (EEC.) has completed -the ' requested -evaluation of.:. the proposed ::Fossil --'Lake Farm Development located:. north tof-:the:<Fossal,:.Creek Reservoir. in Larimer County, Colorado. The project evaluation was performed to conform with part of the conceptual technical review, requirements for Larimer County. The evaluation performed by EEC included a review of ' available data on the soils and geology of the site and a preliminary evaluation of environmental maintenance concerns. The ' results of that evaluation are included in this report. The proposed Fossil Lake Farm will be located in Section 9 and a ' small portion of Section 16 in Township 6 North, Range 68 West of the 6th Principal Meridian, Larimer County, Colorado. The proposed ' development site is located immediately north of the Fossil Creek Reservoir. We understand the proposed development will include ' mixed residential units with a total of approximately 500 units on the approximate 500 acre parcel. We understand the type of residences will range from single family homes to.patio homes. The ' portion of the property adjacent to the Fossil Creek Reservoir will remain as open space. 2600 Canton Ct, Suite A Fort Collins, CO 80525 ' (303) 224-1522 FAX 224-4564 31 I 1 :'CONCEP'P+ TECi3NICAL:I2EVIEW EVALUATION .CONCERNING SOILS, -GEOLOGY AND ENVIRONMENTAL i`.AINTENANCE PROPOSED FOSSIL LAKE FARM DEVELOPMENT •:LARIMER COUNTY, COLORADO PROUECT NO 1941007 EEG EARTH ENGINEERING CONSULTANTS, INC.