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Home My WebLink About20120314.tiff SOILOGIC • October 24, 2011 AGPRofessionals, LLC 4350 Highway 66 Longmont, Colorado 80504 Attn: Mr. Tim Naylor Re: Geology Report Big Thompson Investment Holdings, LLC Parcel Weld County, Colorado Soilogic Project# 11-1089 Mr. Naylor: Soilogic, Inc. (Soilogic) personnel have completed the geologic evaluation you requested for the above referenced project. Our evaluation was completed through review of mapped and published information concerning site soil and groundwater conditions. A list of the references reviewed is included with this report. • The subject property includes a total of approximately 113 acres located in the West %2 of Section 23, Township 4 North, Range 66 West of the 6th Principal Meridian in Weld County, Colorado to be rezoned as industrial. The property is located southeast of the intersection of Weld County Roads 33 and 44. The site is sloping to the east, southeast with the maximum difference in ground surface elevation across the site estimated to be less than 20 feet. The included soil type delineation diagram outlines those soil groupings identified at the site by Weld County Soil Conservation Service (SCS) maps. SCS descriptions of those soil types are included with this report. hi general, the near surface soils at this site appear to consist of low to moderately plastic sandy loam from the Bresser, Julesburg and Otero series. The mapped soils consist of Pinedale and Bull Lake Age alluvium from upper Pleistocene geologic period. Mapped information indicates the property is not in an area identified as being flood prone and would be expected to have groundwater at depths ranging from approximately 10 to 20 below ground surface. Longer term observation of site groundwater levels in wells which are cased and sealed from the influence of surface water would be required to better define seasonal high groundwater • levels and possible fluctuations in those levels over time. Soilogic, Inc. 2012-0314 4350 Highway 66 • Longmont,CO 80504• (970)674-3430 P.O. Box 1121 • Hayden, CO 81639 • (970)276-2087 Big Thompson Investment Holdings, LLC Parcel Weld County, Colorado • Soilogic# I 1-1089 • 2 According to geologic maps of the area, the site overburden soils are underlain by both the Laramie formation consisting of shale, claystone and sandstone and the Fox Hills Sandstone formation from the upper cretaceous period. According to SCS data, the depth to bedrock would be expected to be greater than 5 feet across the site. Based on our review of the site as outlined above, we expect the near surface soils could be used for support of lightly to moderately loaded industrial structures. Deep foundation systems could be employed if heavy foundation loads are anticipated. The site soils would be expected to exhibit percolation rates supporting conventional septic system construction. Site specific percolation testing would be required to better evaluate the percolation rate of near surface soils and depth to bedrock and groundwater in septic absorption field areas. Engineered septic systems would be required for industrial treatment applications. During our review of available site data, we did not identify other potential geologic hazards as outlined in H.B. 1041. In addition, we did not identify economically • recoverable gravel resources at this site. We appreciate the opportunity to be of service to you on this project. If we can be of further service to you in any way or if you have any questions concerning the enclosed information, please do not hesitate to contact us. Very Truly Yours, Soilogic,Inc. RSPOOR FG/S.F1!! V01 4- SS..NA'. tNk Wolf von Carlowitz,P.E. Principal Engineer • Big Thompson Investment Holdings. LLC Parcel Weld County. Colorado Soilogic# 11-1089 • 3 REFERENCES 1. Colton R.B. and Harold R. Fitch, 1974, Map Showing Potential Sources of Gravel and Crushed-Rock Aggregate, in the Boulder-Fort Collins-Greeley Area, Front Range Urban Corridor, Colorado: U.S. Geological Survey Miscellaneous Investigation Series Map I-855-D. 2. Colton R.B., 1978, Geologic Map of the Boulder-Fort Collins-Greeley Area Colorado: U.S. Geological Survey Miscellaneous Investigation Series Map I-955-G. 3. Hershey L.A. and Schneider, Jr. P.A., 1972, Geologic Map of the Lower Cache La Poudre River Basin, North-Central Colorado: U.S. Geological Survey Miscellaneous Investigation Series Map I-687. 4. Hillier D. and Schneider, Jr. P.A., 1979, Depth to the Water Table in the Boulder-Fort Collins-Greeley Area, Front Range Urban Corridor, Colorado: U.S. Geological Survey Miscellaneous Investigation Series Map 1-855-I. • 5. United States Department of Agriculture Soil. Conservation Service and Forest Service in Cooperation with Colorado Agricultural Experiment Station, 1980, Soil Survey of Weld County Area, Colorado, Maps 239-812/3. 6. Schneider, Jr. P. A., 1983 Shallow Groundwater in the Boulder-Fort Collins-Greeley Area, Front Range Urban Corridor, Colorado 1975-77: U.S. Geological Survey Water Resources Investigations Report 83-4058. 7. Soil Survey Staff, Natural Resources Conservation Service, United States Department of Agriculture. Web Soil Survey. Available online at http://websoilsurvey.nrcs.usda.gov/ accessed (October 20, 2011). • Soil Map—Weld County, Colorado, Southern Part (Big Thompson Investment Holdings, LLC) co r en co V R O r • S 520900 521000 521100 521200 521300 521400 521500 521600 521700 521800 40' 18' 23" `r° 40° 18' 23" �E f i r V7 Ccil / -4 ' .: - .. .a ss - 8 § I- �j Y .T��--, t0 i 4 A; - -, . !WC IllprWic--1 i 85. ip-11P A § �'� 1 - I 1 § p'r 4 i . x Lail: • / , , • \ph, ;pi / // lit g s 4 / s � g 8 / , ]Y v R R V V § - . ' \4 § V z § "k. iw sta. ,. e, § -�-�— -` g S o co v v m 1 §S 40° 17' 40" ! 40° 1T40" 520900 521000 521100 521200 521300 521400 521500 521600 521700 521800 • in Map Scale: 1.6,230 if printed on A size (8.5' x 11") sheet. , Meters o o A N 0 50 100 200 300_ _ i Feet 0 200 400 800 1.200 USDA Natural Resources Web Soil Survey 10/19/2011 alrla Conservation Service National Cooperative Soil Survey Page 1 of 3 co v N z co Lo: / \ [ _ \ 7 72{\] § k{ •CO CO § (! .• a e ! ! ; ! | § ( E 4 (� )k / ) (� ) \ co r- _ c - co !! _w \ -ra- o{§ ( / as ` \ 7 \coCOid 2§ } �\ � k ) 0\\ \ i \r 2 /}}\ z f / { \7 �� - co ` 0 °! ` E ! $ » ; Fk| {) � � \ \ }i \ \ �� 2 ■ R - i Er;! 2 Cu�(t ;/ ® : \ \ ! )! 3! C ~=\ (k \u \ \ //\ 75 Cn / ! 7,2 : { r 2/ - ) ] a- | {7e : r0L) 030— « }t (§ ; § §! k :, = a l = r : Cu co 2H UEaw oEt00H ) \\ 0HO.C \ \0 OD co ri\ �\ \cal k \\ }\ 0.va , a cn • - z \• �aa / { 0cOO - ) coOSD \ ti co ti K G - 4i % g § ) , 1 E41It § § LLI 2 7,/ - ) , / _ ! ! \ : / _ 0Q . Cu # \ ) _ # \ ` � - k � = 2 | � ; ! l2• 0Cu 0 ) \ f c12. - _ ! ! a - - e n :0 .7 e -J 2 2 2 co, 0 0 , 0 , 0 ) g � g ° Z <. >< , ■ - -$ c©® + x � � � * , � ! 2 • Soil Map—Weld County,Colorado,Southern Part Big Thompson Investment Holdings,LLC • Map Unit Legend Weld county,'Colorado,Southern Part(00618);. Mep Unit Symbol `Map Unit Name Aerea in AOI, Paroant'ot AOl 11 Bresser sandy loam,0 to 1 percent slopes 39.6 34.2% 12 Bresser sandy loam, 1 to 3 percent slopes 30.2 26.0% 30 Julesburg sandy loam, 1 to 3 percent 45.6 39.4% slopes 51 j Otero sandy barn, 1 to 3 percent slopes 0.4 0.3% Totals for Area of Interest 115.8 100.0% •maaLISDA• Natural Resources Web Soil Survey 10/19/2011 Conservation Service National Cooperative Soil Survey Page 3 of 3 • Map Unit Description:Bresser sandy loam,0 to 1 percent slopes—Weld County, Big Thompson Investment Holdings,LLC Colorado,Southern Part • Weld County, Colorado, Southern Part 11—Bresser sandy loam, 0 to 1 percent slopes Map Unit Setting Elevation:4,700 to 4,800 feet Mean annual precipitation: 12 to 15 inches Mean annual air temperature:46 to 52 degrees F Frost-free period: 135 to 155 days Map Unit Composition Bresser and similar soils: 90 percent Minor components: 10 percent Description of Bresser Setting Landform:Terraces Down-slope shape: Linear Across-slope shape: Linear Parent material:Alluvium Properties and qualities Slope:0 to 1 percent Depth to restrictive feature: More than 80 inches • Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):Moderately high to high (0.57 to 2.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Available water capacity: Low(about 6.0 inches) Interpretive groups Land capability classification (irrigated): 2s Land capability(non irrigated):4c Ecological site: Sandy Plains (R067BY024CO) Typical profile 0 to 16 inches: Sandy loam 16 to 25 inches: Sandy clay loam 25 to 30 inches: Sandy loam 30 to 60 inches: Loamy sand LL,2 Natural Resources Web Soil Survey • 10/19/2011 a Conservation Service National Cooperative Soil Survey Page 1 of 2 Map Unit Description:Bresser sandy loam,0 to 1 percent slopes—Weld County, Big Thompson Investment Holdings,LLC Colorado,Southern Part • Minor Components Ascalon Percent of map unit: 10 percent Data Source Information Soil Survey Area: Weld County, Colorado, Southern Part Survey Area Data: Version 11, Aug 27, 2009 • • • USDA Natural Resources Web Soil Survey 10/19/2011 Conservation Service National Cooperative Soil Survey Page 2 of 2 Map Unit Description:Bresser sandy loam,1 to 3 percent slopes—Weld County, Big Thompson Investment Holdings,LLC Colorado,Southern Part • Weld County, Colorado, Southern Part 12—Bresser sandy loam, 1 to 3 percent slopes Map Unit Setting Elevation:4,700 to 4,800 feet Mean annual precipitation: 12 to 15 inches Mean annual air temperature:46 to 52 degrees F Frost-free period: 135 to 155 days Map Unit Composition Bresser and similar soils: 90 percent Minor components: 10 percent Description of Bresser Setting Landform:Terraces Down-slope shape: Linear Across-slope shape: Linear Parent material:Alluvium Properties and qualities Slope: 1 to 3 percent Depth to restrictive feature: More than 80 inches • Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 2.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Available water capacity: Low(about 6.0 inches) Interpretive groups Land capability classification (irrigated):2e Land capability(nonirrigated):4c Ecological site: Sandy Plains (R067BY024CO) Typical profile 0 to 16 inches: Sandy loam 16 to 25 inches: Sandy clay loam 25 to 30 inches: Sandy loam 30 to 60 inches: Loamy sand Minor Components Ascalon Percent of map unit: 5 percent • US2 Natural Resources Web Soil Survey 10/19/2011 iiiiiiii Conservation Service National Cooperative Soil Survey Page 1 of 2 Map Unit Description:Bresser sandy loam,1 to 3 percent slopes—Weld County, Big Thompson Investment Holdings,LLC Colorado,Southern Part • Vona Percent of map unit: 5 percent Data Source Information Soil Survey Area: Weld County, Colorado, Southern Part Survey Area Data: Version 11,Aug 27, 2009 • • !ism Natural Resources Web Soil Survey 10/19/2011 Conservation Service National Cooperative Soil Survey Page 2 of 2 • Map Unit Description:Julesburg sandy loam,1 to 3 percent slopes—Weld Big Thompson Investment Holdings,LLC County,Colorado,Southern Part • Weld County, Colorado, Southern Part 30—Julesburg sandy loam, 1 to 3 percent slopes Map Unit Setting Elevation:4,700 to 4,800 feet Mean annual precipitation: 15 to 19 inches Mean annual air temperature.:48 to 52 degrees F Frost-free period: 145 to 155 days Map Unit Composition Julesburg and similar soils: 90 percent Minor components: 10 percent Description of Julesburg Setting Landform:Terraces Down-slope shape: Linear Across-slope shape: Linear Parent material:South platte river alluvium Properties and qualities Slope: 1 to 3 percent Depth to restrictive feature:More than 80 inches • Drainage class:Well drained Capacity of the most limiting layer to transmit water(Ksat): High(2.00 to 6.00 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water capacity Moderate (about 6.5 inches) Interpretive groups Land capability classification (irrigated):2e Land capability(non irrigated): 3e Ecological site: Sandy Plains (R067BY024CO) Typical profile 0 to 12 inches: Sandy loam 12 to 27 inches:Sandy loam 27 to 60 inches:Sand Minor Components Valent Percent of map unit: 5 percent • USDA Natural Resources Web Soil Survey 10/19/2011 'i Conservation Service National Cooperative Soil Survey Page 1 of 2 Map Unit Description:Julesburg sandy loam, 1 to 3 percent slopes—Weld Big Thompson Investment Holdings,LLC County,Colorado,Southern Part • Remmit Percent of map unit: 5 percent Data Source Information Soil Survey Area: Weld County, Colorado, Southern Part Survey Area Data: Version 11, Aug 27, 2009 • • USDA Natural Resources Web Soil Survey 10/19/2011 imi Conservation Service National Cooperative Soil Survey Page 2 of 2 Map Unit Description:Otero sandy loam, 1 to 3 percent slopes—Weld County, Big Thompson Investment Holdings,LLC Colorado,Southern Part • Weld County, Colorado, Southern Part 51—Otero sandy loam, 1 to 3 percent slopes Map Unit Setting Elevation:4,700 to 5,250 feet Mean annual precipitation: 12 to 15 inches Mean annual air temperature:48 to 52 degrees F Frost-free period: 130 to 180 days Map Unit Composition Otero and similar soils: 85 percent Minor components: 15 percent Description of Otero Setting Landform: Plains Down-slope shape: Linear Across-slope shape: Linear Parent material: Eolian deposits and/or mixed outwash Properties and qualities Slope: 1 to 3 percent Depth to restrictive feature: More than 80 inches • Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.57 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Calcium carbonate, maximum content: 10 percent Maximum salinity: Nonsaline to very slightly saline(0.0 to 4.0 mmhos/ cm) Available water capacity: Moderate (about 7.7 inches) Interpretive groups Land capability classification(irrigated):3e Land capability(nonirrigated):4e Ecological site: Sandy Plains (R067BY024CO) Typical profile 0 to 12 inches: Sandy loam 12 to 60 inches: Fine sandy loam Minor Components Kim Percent of map unit: 10 percent • USDA Natural Resources Web Soil Survey 10/19/2011 teas Conservation Service National Cooperative Soil Survey Page 1 of 2 Map Unit Description:Otero sandy loam,1 to 3 percent slopes—Weld County, Big Thompson Investment Holdings,LLC Colorado,Southern Part • Vona Percent of map unit:5 percent Data Source Information Soil Survey Area: Weld County, Colorado, Southern Part Survey Area Data: Version '11, Aug 27, 2009 • • USDA Natural Resources Web Soil Survey 10/19/2011 a Conservation Service National Cooperative Soil Survey 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