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HomeMy WebLinkAboutHOMESTEAD PUD SECOND - Filed SER-SUBSURFACE EXPLORATION REPORT - (3)V 2 SUBSURFACE EXPLORATION REPORT es 2.rG jrr LARIMER COUNTY, COLORADO HAAx.5 p'4" EEC PROJECT NO. 1012055 c EARTH ENGINEERING CONSULTANTS, INC. April 25, 2001 Splittgerber Development 2801 Hearthstone Drive Fort Collins, Colorado 80528 Attn: Mr. Rick Splittgerber Re: Preliminary Subsurface Exploration Report Hearthside P.U.D. Larimer County, Colorado EEC Project No. 1012055 Mr. Splittgerber: Enclosed, herewith, are the results of the preliminary subsurface exploration completed by Earth Engineering Consultants, Inc. personnel for the referenced project. In summary, the subsurface soils encountered in the test borings consisted of sandy lean clay overlying highly weathered claystone bedrock. The bedrock was encountered at depths of 9 to 13 feet in the test borings. Zones of clayey sand and gavel were observed underlying the lean clays above the bedrock in borings B-1 and B-6. Groundwater was encountered at a depth of approximately 11 feet in boring B-6 at the time of our exploration; however, was not encountered in the other borings. Based on the materials we observed at the boring locations, we expect lightly loaded residential structures could be supported on conventional footing foundation bearing in the near surface low plasticity cohesive soils. Care will be required to see that footing foundations are supported on suitable strength materials and that a 3-foot minimum separation from expansive bedrock is maintained. The near surface low plasticity cohesive materials also appear usable for direct support of floor slabs or pavements. Preliminary geotechnical recommendations concerning design and construction of foundations and support of floor slabs and pavements are presented in the text of the attached report. CENTRE FOR ADVANCED TECHNOLOGY 2301 RESEARCH BOULEVARD, SUITE 104 FORT COLLINS, COLORADO 80526 970) 224-1 522 (FAx) 224-4564 Earth Engineering Consultants,Inc. EEC Project No. 1012055 April 25,2001 Page 2 We appreciate the opportunity to be of service to you on this project. If you have any questions concerning the enclosed 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: 1t'` 41- Ve:cie4z7:: Wolfram Von Carlowitz, E.I.T. Lester E. Staff Engineer Principal Engineer • PRELIMINARY SUBSURFACE EXPLORATION REPORT HEARTI-ISIDE P.U.D. LARIMER COUNTY, COLORADO EEC PROJECT NO. 1012055 April 25, 2001 INTRODUCTION The preliminary subsurface exploration for the Hearthside P.U.D. located in the NE1/4 of Section 8,Township 6 North,Range 68 West of the 6th P.M. in Larimer County, Colorado, has been completed. Six(6) soil borings extending to depths of approximately 15 feet below present site grades were advanced on the property to obtain information on existing subsurface conditions. Individual boring logs and a diagram indicating the approximate boring locations are included with this report. The proposed Hearthside P.U.D.includes approximately 25 acres to be developed as single- family residential. We expect the single-family structures will be one or two-story, wood frame buildings with full basements. Foundation loads for the proposed residences are expected to be light with continuous wall loads less than 2.5 kips per lineal foot and column loads less than 50 kips. Floor loads are expected to be less than 100 psf. It is expected that low volumes of automobiles and light trucks will use the site roadways. Small grade changes are expected to develop final site grades. The purpose of this report is to describe the subsurface conditions encountered in the borings, analyze and evaluate the test data and provide preliminary geotechnical recommendations concerning design and construction of foundations and support of floor slabs and pavements. EXPLORATION AND TESTING PROCEDURES The boring locations were selected and established in the field by Earth Engineering Consultants, Inc. (EEC)personnel by estimating angles and distances from identifiable site references. The locations of the borings should be considered accurate only to the degree implied by the methods used to make the field measurements. Earth Engineering Consultants,Inc. EEC Project No. 1012055 April 25,2001 Page 3 SITE AND_SUBSURFACE CONDITIONS The development parcel is located southwest of the intersection of Larimer County Roads 9 and 36 in Fort Collins, Colorado. The project site is presently undeveloped pasture. Surface drainage is generally to the northwest with the maximum difference in ground surface elevation across the site estimated to be on the order of 10 to 15 feet. An EEC field engineer was on-site during drilling to direct the drilling activities and evaluate the subsurface materials encountered. Field descriptions of the materials encountered were based on visual and tactual observation of disturbed samples and auger cuttings. The boring logs included with this report may contain modifications to the field logs based on results of laboratory testing and engineering evaluation. Based on results of field and laboratory evaluation, subsurface conditions can be generalized as follows. Approximately 3 to 6 inches of vegetation and/or topsoil were encountered at the surface at the boring locations. The topsoil and/or vegetation was underlain by light to reddish brown sandy lean clay with varying amounts of silt and sand. The sandy lean clay soils were generally medium stiff to stiff and exhibited low to moderate plasticity. Those soils showed low potential to change volume with variation in moisture content at current moisture and density conditions. The essentially cohesive overburden soils extended to depths of approximately 9 to 13 feet below ground surface at the boring locations. The lean clay soils in borings B-1 and B-6 were underlain by reddish brown clayey sand with gravel. These essentially granular materials were loose to medium dense and showed low swell potential at current moisture and density conditions. The clayey sands and gravels extended to a depth of approximately 13 feet below site grades. The lean clay and clayey sand overburden soils were underlain by highly weathered claystone bedrock. The claystone bedrock encountered was colored brown/gray/rust, moderately to highly plastic and would be subject to volume change with variation in moisture content. The Earth Engineering Consultants,Inc. EEC Project No. 1012055 April 25,2001 Page 6 bearing pressure refers to the pressure at foundation bearing level in excess of the minimum surrounding overburden pressure. Total load should include full dead and live loads. Occasional soft zones were observed. The site soils should be expected to be soft near the water table. Care will be needed in design and construction to evaluate possible soft bearing materials. Exterior foundations and foundations in unheated areas should be located at least 30 inches below adjacent exterior grade to provide frost protection. Formed continuous footings should have a minimum width of 12 inches and isolated column foundations a minimum width of 24 inches. Trenched foundations or grade beam foundations could be used in the near surface soils. If used,we recommend trenched foundations have a minimum width of 12 inches and formed continuous foundations have a minimum width of 8 inches. Floor Slab Subgrades All existing vegetation/topsoil should be removed from beneath the floor slab areas.After stripping and completing all cuts and prior to placement of any floor slabs or fill,the exposed subgrades should be scarified, adjusted in moisture content and recompacted as outlined for Site Development." Fill soils required to develop the floor slab subgrades should consist of approved, low- volume change materials which are free from organic matter and debris Those materials should contain a minimum of 15% fines, material passing a#200 sieve. The near surface soils could be used for fill beneath floor slabs. Those materials should be placed and compacted as outlined for the site fill soils. Care should be taken after development of the floor slab subgrades to prevent disturbance of the in-place materials. Materials which are loosened or disturbed by construction activities or materials which become wet and softened or dry and desiccated should be reworked prior to placement of the overlying floor slabs. Earth Engineering Consultants,Inc. EEC Project No. 1012055 April 25,2001 Page 9 For preliminary estimates, "local" streets will likely include 31/2 inches of hot bituminous pavement overlying 6 inches of aggregate base and "collector" streets will likely include 4 inches of hot bituminous pavement overlying 8 inches of aggregate base. GENERAL COMMENTS The analysis and recommendations presented in this report are based upon the data obtained from the soil borings performed at the indicated locations and from any other information discussed in this report. This report does not reflect any variations which may occur between borings or across the site. The nature and extent of such variations may not become evident until construction. If variations appear evident, it will be necessary to re-evaluate the recommendations of this report. It is recommended that the geotechnical engineer be retained to review the plans and specifications so that comments can be made regarding the interpretation and implementation of our geotechnical recommendations in the design and specifications. It is further recommended that the geotechnical engineer be retained for testing and observations during earthwork and foundation construction phases to help determine that the design requirements are fulfilled. This report has been prepared for the exclusive use of Splittgerber Development for specific application to the project discussed and has been prepared in accordance with generally accepted geotechnical engineering practices. No warranty, express or implied, is made. In the event that any changes in the nature, design or location of the project as outlined in this report are planned, the conclusions and recommendations contained in this report shall not be considered valid unless the changes are reviewed and the conclusions of this report modified or verified in writing by the geotechnical engineer. DRILLING AND EXPLORATION DRILLING&SAMPLING SYMBOLS: SS: Split Spoon- 13/8"I.D.,2" O.D.,unless otherwise noted PS: Piston Sample ST: Thin-Walled Tube-2"O.D.,unless otherwise noted WS: Wash Sample R: Ring Barrel Sampler-2.42" I.D.,3"O.D.unless otherwise noted PA: Power Auger FT: Fish Tail Bit HA: Hand Auger RB: Rock Bit DB: Diamond Bit=4",N,B BS: Bulk Sample AS: Auger Sample PM: Pressure Meter HS: Hollow Stem Auger WB: Wash Bore Standard"N"Penetration:• Blows per foot of a 140 pound hammer falling 30 inches on a 2-inch O.D. split spoon,except where noted. WATER LEVEL MEASUREMENT SYMBOLS: WL : Water Level WS : While Sampling WCI: Wet Cave in WD : While Drilling DCI: Dry Cave in BCR: Before Casing Removal AB : After Boring ACR: After Casting Removal Water levels indicated on the boring logs are the levels measured in the borings at the time indicated. In pervious soils,the indicated levels may reflect the location of ground water. In low permeability soils,the accurate determination of ground water levels is not possible with only short term observations. DESCRIPTIVE SOIL CLASSIFICATION DEGREE OF WEATHERING: Soil Classification is based on the Unified Soil Classification Slight Slight decomposition of parent material on system and the ASTM Designations D-2488. Coarse Grained joints. May be color change. Soils have move than 50%of their dry weight retained on a#200 Moderate Some decomposition and color change sieve;they are described as: boulders,cobbles,gravel or sand. throughout. Fine Grained Soils have less than 50% of their dry weight High Rock highly decomposed,may be extremely retained on a#200 sieve;they are described as : clays, if they broken. are plastic, and silts if they are slightly plastic or non-plastic. HARDNESS AND DEGREE OF CEMENTATION: Major constituents may be added as modifiers and minor Limestone and Dolomite: constituents may be added according to the relative proportions Hard Difficult to scratch with knife. based on grain size. In addition to gradation, coarse grained Moderately Can be scratched easily with knife. soils are defined on the basis of their relative in-place density and fine grained soils on the basis of their consistency. Hard Cannot be scratched with fingernail. Example: Lean clay with sand, trace gravel, stiff(CL); silty Soft Can be scratched with fingernail. sand,trace gravel,medium dense(SM).Shale,-Siltstone.and Claystone: CONSISTENCY OF FINE-GRAINED SOILS Hard Can be scratched easily with knife,cannot be scratched with fingernail. Unconfined Compressive Moderately Can be scratched with fingernail, Strength,Qu,psf Consistency Hard 500 Very Soft Soft Cannebse easily dented but not molded with 500- 1,000 Soft Sandstone and Conglomerate: 1,001 - 2,000 Medium Well - Capable of scratching a knife blade. 2,001 - 4,000 Stiff Cemented 4,001 8,000 Very Stiff Cemented Can be scratched with knife. 8,001 - 16,000 Very Hard Poorly Can be broken apart easily with fingers. RELATIVE DENSITY OF COARSE-GRAINED SOILS: Cemented N-Blows/ft Relative Density 0-3 Very Loose 4-9 Loose 10-29 Medium Dense 30=49 Dense 50-80 Very Dense 80+ Extremely Dense PHYSICAL PROPERTIES OF BEDROCK UNIFIED— SQL CLASSIFICATION SYSTEM Soil Classification Group Group NameCriteriaforAssigningGroupSymbolsandGroupnamesUsingLaboratoryTestsSymbol Coarse-Grained Gravels more than Clean Gravels Less Soils more than 50% of coarse than 5% fines Cu>4 and <C,cS3E GW Well-graded gravel° 50% retained on fraction retained No. 200 sieve on No. 4 sieve Cu<4 and/or 1>Cc>3E GP Poorly-graded grovel' Gravels with Fines Fines classify as ML or MH GM Silty gravel, G,H more than 12% fines Fines classify as CL or CH GC Clayey Gravel r. " Sands 50% or Clean Sands Less Cu>6 and 1<Gc<3E sw Well-graded sand' more coarse than 5% fines fraction passes Cu<6 and/or 1>Cc>3E SP Poorly-graded sand' No. 4 sieve Sands with Fines Fines classify as ML or MH SM Silty sand`'''more than 12% fines Fines classify as CL or CH SC Clayey sandc.n' Fine-Grained Silts and Clays inorganic PI>7 and plots on or above "A"Lined CL Lean clay"'Soils 50% or Liquid Limit less more passes the than 50 PI<4 or plots below "A"Line ML Silt" No. 200 sieve organic Liquid Limit - oven dried Organic clay 0.75 OL Liquid Limit - not dried Organic silt".11•0 Silts and Clays inorganic PI plots on or above "A"Line - CH Fat clay''"' Liquid Limit 50 or more PI plots below "A"Line MH Elastic Silt"'"" organic Liquid Limit oven dried. Organic clay"4"•' 0.75 OH Liquid Limit - not dried Organic silt"" Highly organic soils Primarily organic matter, dark in color, and organic odor PT Peat Based on the material passing the 3-in. (75- E Ds0 if soil-contains 15 to 292plus No. 200, add mm) sieve Cu=O501 I CC= D x 0 with sand" or"with graver, whichever is aif field sample contained cobbles or boulders, predominant or both, odd "with cobbles or boulders, or both" Llf soil contains 2 30" plus No. 200 to group name. rlf soil contains 215% sand, add"with•sand"to predominantly sand. odd "sandy to group Gravels with 5 to 12% fines required dual name. group name, symbols: d If soil contains 2 30X plus Na. 200IffinesclassifyasCL-ML use dual symbolGW-GM well graded gravel with silt predominantly gravel, add "gravely" to groupGC-CM, or SC-SM. GW-GC. well graded gravel with clay If fines are organic, add"with organic fines"to Name. GP-GM poorly-graded gravel with silt group name P124 and plots an or above "A" line. GP-GC poorly-graded grovel with clay PI54 or plots below "A" line.If soil contains >15Sgravel, odd"with graver P Sands with 5 to 12R fines require dual Pi plots on or above "A" line.to group name,asymbols: If Atterberg limits plots shaded. area, soil is a Pt plots below "A" line. SW-SM well-graded sand with silt CL-ML, cilty day. SW-SC well-graded sand with clay SP-SM poorly graded sand with silt SP-SC poorly graded sand with cloy BO Far Classification of fine-grained soils 1-'Classification and fine—grained fraction of coarse— grained sale. e 50— Equation of"A"—fine Horizontol at PI-4 to 1..1.-25.5, ei then PI-0.73(LL-20) e87Eeuaticeof"U"—line 0 fi Vertleei at LL-18 -7,to PI P X then PI-0.9(LL-a) cn GZ Y 30- U I= el M H aR 0 H CG, 1a- d i 1 0 10 20 30 40 "50 Bo " 70 80 90 100 110 LIQUID LIMIT (LL) HEARTHSIDE P.U.D. LARIMER COUNTY,COLORADO PROJECT NO: 1012055 DATE: APRIL 2001 LOG OF BORING-B-3 - __ RIG TYPE: CME 45 SHEET 1 OF 1 WATER DEPTH FOREMAN:SG START DATE 4/5/01 WHILE DRILLING None AUGER TYPE: 4"CFA FINISH DATE 4/5/01 AFTER DRILLING SPT.HAMMER: Manual SURFACEIELEV N/A_ 24 HOUR N/A D N OU MC 00 A-LIMITS 200 SWELL SOIL DESCRIPTION TYPE (FEET)_.. (FEET) _.(BLOWSIFT) (PSF).__ _ (%) (PCF) LL _I_... PI .- - .(%)_ - PRESSURE %®500 PSF TOPSOIL AND VEGETATION 1 LEAN CLAY WITH SAND(CL) 2 brown/tan/rust medium to very stiff 3 with calcareous deposits 4 SS -5 8 9000 14.8 6 7 8 9 CS 10 18. 8500 _ _16.3. __111.2__ 35._- .22 . -_72.6.._. <500pst . None ... 1-1 12 1-3 CLAYSTONE 1-4 tan/brown/rust soft SS 15 18 5500 17.0 BOTTOM OF BORING 15.5'1-6 1-7 1-8 1-9 20 21 22 23 24 2-5 Earth Engineering Consultants HEARTHSIDE P.U.D. LARIMER COUNTY,COLORADO PROJECT NO: 1012055 DATE: APRIL 2001 LOG OF BORING 8-4 RIG TYPE: CME 45 SHEET 1.OF1 _. . . _ -. _ - __- _ WATER DEPTH FOREMAN::SG.- _._- START DATE_ ._. _. 4/5/01 WHILE DRILLING ._ _ - None AUGER TYPE:4'CFA FINISH DATE 4/5/01 AFTER DRILLING SPT HAMMER: Manual SURFACE ELEV N/A 24 HOUR N/A D N DU MC do 411MITS 400 SWELL SOIL DESCRIPTION TYPE (FEET)`(BLOWS/FT) (PSF)I (PCF) ` LL j Pt (%) PRESSURE ! %500 PSF • TOPSOIL AND VEGETATION LEAN CLAY WITH SAND(CL) brown/light brown 2 medium to very stiff with calcareous deposits CS .3 9 9000+ 16.7 106.0 4 SS 5 7 4500 19.6 7 S 9 SS 1-0 14 6500 15.7 1-1 CLAYSTONE brown/olive/tust 12 soft with calcareous deposits 13 1-4 SS 15 17 5500 23.3 BOTTOM OF BORING 15.5'1-6 17 18 19 2-0 21 2-2 2-3 24 25 Earth Engineering Consultants HEARTHSIDE P.U.D. LARIMER COUNTY,COLORADO PROJECT NO: 1012055 _ -. - ._ DATE: APRIL 2001 - - - LOG OF BORING B-S RIG TYPE: CME 45 SHEET 1 OF 1 WATER DEPTH FOREMAN:SG START DATE 4/9/01 WHILE-DRILLING None AUGER TYPE: 47 CFA FINISH DATE 4/9/01. AFTER DRILLING SPT HAMMER: Manual SURFACE ELEV N/A 24 HOUR N/A QU MC DO _-..ALIMITS. 200 SWELL SOIL DESCRIPTION TYPE (FEET) (BLOWS/FT) (PSF)I%) (PCP) u. PI (%) PRESSURE % .500.PSI' TOPSOIL AND VEGETATION 1 LEAN CLAY WITH SAND(CL) light brown 2 stiff to very stiff with calcareous deposits CS 3 17... . 9000+ 15.5 88.0 _40 18. - 71.1 700pst 0.3% 4 CS -5 16 9000+ 11.5 93.2 6 7 8 9 SS 1-0 15 9000+ 12.7 1-1 1-2 1-3 CLAYSTONE 1-4 brown/rust soft SS 1-5 17 3000 22.4 BOTTOM OF BORING 15.5'1-8 1-7 1-8 1-9 2-0 2-1 2-2 2-3 2-4 25 _ Earth Engineering Consultants HEARTHSIDE P.U.D. LARIMER COUNTY,COLORADO PROJECT NO: 1012055.DATE: APRIL 2001 LOG.OF_BORING.B-8 RIG TYPE CME-45 SHEET 1 OF 1 WATER DEPTH _.. _.. FOREMAN:SG START DATE. 4/9/01 WHILE DRILLING 11.0' ____.. AUGER TYPE: 4"CFA FINISH DATE 4/9/01 AFTER DRILLING SPT HAMMER:-Manual_SURFACE ELEV_ -. NIA 24 HOUR.__N/A D N OU MC DO A-UMITS 200 SWELL SOIL DESCRIPTION i TYPE (FEET) (BLOWS/FT) (PSF)PCF) U. PI (%). PRESSURE I %(11.500PSF TOPSOIL AND VEGETATION 1 LEAN CLAY WITH SAND(CL) 2 brown medium stiff to stiff SS -3 5 6500 18.1 with caldaredus deposits 4 SS 5 4 4000 19.3 6 7 8 9 CLAYEY SAND(SC) CS 10 6 4500. 15.9.. ... 113.1 32.. _ 19 45.1 <500ps1 None red/brown loose 1-1 1-2 1-3 CLAYSTONE 1-4 rust/yellow soft SS 15 _-. 9 _.._._ 4500 _ 21.8. BOTTOM OF BORING 15.5'16 17 18 1-9 2-0 2-1 22 23 2-4 25.. Earth Engineering Consultants SWELL / CONSOLIDATION TEST RESULTS Material Description:Brown/Dark Brown Lean Clay with Sand Sample Location: B-1, S-1 @ 2.0' Liquid Limit: 38 Plasticity Index: 23 Passing#200: 72.4 Beginning Moisture: 19.5% Dry Density: 101.0 pcf Ending Moisture: 22.7%0 Swell Pressure: <500 psf Swell @ 500 psf: None 10 1 1 1 I g I 1 I I I 1 c 6 I I 1 4 1 I ;I I 48 2 j I I o I 8 CD Wa er Ac ded 2 4 c0 0 I coI c _ 6 I 1 1 I8 11 I j i 10 I 0,01 0.1 1 10 Load (TSF) Project: Hearthside P.U.D. Larimer County, Colorado Project No.: 1012055 Date: April 2001 7/1‘n t a ESE Cl' o SWELL / CONSOLIDATION TEST RESULTS Material Description:Light'Brown Lean Clay with Sand Sarnple_Location: B-3,_S-2 @ 9.0' Liquid Limit: 35 Plasticity Index: 22 A) Passing #200: 72.6 __ Beginning Moisture: 17.2%° Dry Density: 110.6 pcf Ending Moisture: 18.2%0 Swell Pressure: <500 psf A) Swell @ 500 psf: None 10 r 8 I1 i m I 6 11 j I 1 1 1 I 1 4 1 I. E 2 1 I 0 j1 11 0 Water A ded 1CL2I . c0 ca j 0 6 ca o II 8 1 I I 1 10 J 0.01 0.1 1 10 Load (TSF) Project: Hearthside P.U.D. Larimer County, Colorado Project No.: 1012055 Date: Aril 2001 h EEC")'3E ECG' SWELL / CONSOLIDATION TEST RESULTS Material Description:Red/Brown Lean Clay with Sand. Sample Location: B-5, S-1 @ 2.0' Liquid Limit: 40 Plasticity Index: 18 Passing #200: 71.1 Beginning Moisture: 14.5% Dry Density: 91.6 pcf Ending Moisture: 29.6%0 Swell Pressure: 700 psf Swell @ 500 psf: 0.3% 10 1 1 f 1 i I 1 8 1 I I 1I I c 6 I i I 1 1 i 4 _ i H I I I 2 1Ii E o o 2 i i aater 'dded 2 co 0cn -6 0 U I I 8 I 1 1 I 10 j 0.01 0.1 1 10 Load (TSF) Project: Hearthside P.U.D. Larimer County, Colorado Project No.: 1012055 Date: April 2001 P` IEE ''."'-::;' :) SWELL / CONSOLIDATION TEST RESULTS Material Description:Red/Brown Clayey Sand Sample Location: B-6, S-3 @ 9.0' Liquid Limit: 32 Plasticity Index: 19 Passing #200: 45.1 Beginning Moisture: 14.2% Dry Density: 120.0 pcf Ending Moisture: 16.2%0 Swell Pressure: <500 psf Swell @ 500 psf: None 10 I I I 1 8 I 1 I 11II 1111 I11 Ti 1 1 co 6 1 1 1 1 1 I I it I 4 I 1 j 1 1 I i I c 2 i i I 1 ary L 1 0 0 I L 0 Water,Added 2 I 1 1 4 I c0 m 6 i 1 1 i a I 1 i E 1 I H I1o10110 Load (TSF) Project: Hearthside P.U.D. Larimer County, Colorado Project No.: 1012055 Date: April 2001 E E C !1 EEC S January 22, 2002 EARTH ENGINEERING CONSULTANTS, INC. Splittgerber Professional Builders P.O. Box 271307 Fort Collins, Colorado 80527-1307 Attn: Mr. Rick Splittgerber Re: Grading Plan Evaluation Hearthside P.U.D. Fort Collins, Colorado EEC Project No. 1012055 Mr. Splittgerber: Earth Engineering Consultants, Inc. (EEC) personnel have completed the evaluation of the proposed grading plan for the Hearthside development in Fort Collins, Colorado. It is our understanding that grades on the referenced site may be adjusted in order to facilitate walkout or garden level basement construction. The purpose of this report is to evaluate the proposed cuts and fills with respect to observed groundwater and bedrock levels. A subsurface exploration report prepared by EEC for this project was submitted to your attention on April 25, 2001. In that report, groundwater was identified at a depth of approximately 11.0 feet below site grades in boring B-6 located near the southwest corner of the site. Groundwater was not encountered in the remainder of the completed borings at the time of drilling. Depth to groundwater was measured again in boring B-6 on January 21, 2002. At that time, the depth to groundwater was observed to be approximately 11.0 feet below present site grades. Based on the proposed grading plan, it appears as though the most significant cuts will be completed in the western portion of the development site. Cuts in this area are expected to be on the order of approximately 6 to 8 feet. Based on the anticipated cuts, finish floor elevations appear to be approximately 3 feet above any observed groundwater. However, stemwall footing foundations may approach current groundwater levels where zones of softer materials would be expected. Overexcavation/backfill procedures may be required in areas of observed soft material in order to develop suitable foundation bearing. CENTRE FOR ADVANCED TECHNOLOGY 2301 RESEARCH BOULEVARD, SUITE 104 FORT COLLINS, COLORADO 80526 970) 224-1522 (FAx) 224-4564 Earth Engineering Consultants,Inc. EEC Project No. 1012055 January 22,2002 Page 2 Soft claystone bedrock was encountered in the test borings completed along the western portion of the site at depths ranging from approximately 10 to 13 feet below ground surface. Based on the anticipated cuts, stemwall footing foundations may bear on or immediately above the claystone bedrock. Typically, we recommend site improvements not be supported within 3 feet of expansive bedrock. Careful evaluation of the bedrock in this area should be performed prior to grading. If moderate to high swell potential is observed, minimum required separations may be warranted. We appreciate the opportunity to work with 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: tem Wolf von Carlowitz, ELT. Lest on, P.E. Project Engineer Principal Engineer fa. ff EEC EARTH ENGINEERING CONSULTANTS, INC. February 19, 2001 Splittgerber Construction Company 2801 Hearthstone Drive Fort Collins, Colorado 80528 Attn: Mr. Rick Splittg,rbe,. Re: Proposal for Preliminary Geotechnical Exploration Splittgerber Development Fort Collins, Colorado Mr. Splittgerber: We are pleased to submit this proposal to provide subsurface exploration and geotechnical engineering services to you for the referenced project. We understand this project involves the development of approximately 25 acres as single-family residential. construction. It is anticipated that approximately 31 homes will be constructed for this project. Those homes are expected to be one or two-story wood frame structures constructed with full basements. Foundation loads for those structures are expected to be light with continuous wall loads less than 2 kips per lineal foot and individual column loads less than 30 kips. Site infrastructure including site utilities and roadways will be constructed for this development. It is anticipated that small grade changes will be required to develop the site grades. To develop preliminary subsurface information on this property, Earth Engineering Consultants, Inc. (EEC)proposes to advance a total of six (6) soil borings. Those borings would extend to depths of approximately 15 feet below present site grades with samples obtained at maximum 5-foot intervals throughout the drilling depth. Laboratory testing would be completed on the recovered samples to evaluate the composition and consistency of the subgrade materials. We anticipate the laboratory testing will include moisture content, dry density, unconfined strength and swell/consolidation tests. After completing the field borings and laboratory testing, we would prepare a preliminary geotechnical report providing a preliminary evaluation of subgrade conditions at the site and an assessment of the impact of those conditions on the proposed construction. Additional exploration will likely be required on a individual basis for the residential structures and the City of Fort Collins requires the exploration for the street design to be completed after the water and sewer have been installed and street subgrades developed CENTRE FOR ADVANCED TECHNOLOGY 2301 RESEARCH BOULEVARD, SUITE 104 FORT COLLINS, COLORADO 80526 970) 224-1 522 (FAx) 224-4564 EARTH ENGINEERING CONSULTANTS, INC. GENERAL CONDITIONS FOR SUBSURFACE EXPLORATION SERVICES Section 1: Scope of Work EARTH ENGINEERING CONSULTANTS,INC.(EEC)shall perform the services defined in the contract and shall invoice the client for those services at the fee schedule rates. Any cost estimates stated in this contract shall not be considered as a firm figure unless otherwise specifically stated in this contract. If unexpected site conditions are discovered,the scope of work may change,even as the work is in progress. EEC will provide these additional service at the contract fee schedule rate. Rates for work beyond the scope of this contract and not covered by the contract fee schedule can be provided. EEC can perform additional work with verbal authorization,and will provide written confirmation of fees,if requested. All costs incurred because of delays in authorizing the addition work will be billed to the client. Fee schedules are valid for one year following the date of the contract unless otherwise noted. SECTION 2: Access to Sites Unless otherwise agreed,the client will furnish EEC with right-of-access to the site in order to conduct the planned exploration. While EEC will take all reasonable precautions to minimize any damage to the property,it is understood by the client that in the normal course of work some damage may occur,the restoration of which is not part of this agreement. SECTION 3: Soil Boring Locations The client will furnish EEC with a diagram indicating the location of the site. Test boring locations may also be indicated on the diagram. EEC reserves the right to deviate a reasonable distance from the boring locations specified unless this right is specifically revoked by the client in writing at the time the location diagram is supplied. EEC reserves the right to terminate this contract if conditions preventing drilling at the specified locations are encountered which were not made known to EEC prior to the date of this contract. The accuracy and proximity of provided survey control will affect the accuracy of in-situ test location and elevation determinations. Unless otherwise noted,the accuracy of test locations and elevations will be commensurate only with pacing and approximate measurements or estimates. SECTION 4: Utilities In the performance of its work,EEC will take all reasonable precautions to avoid damage or injury to subterranean structures or utilities. The client agrees to hold EEC harmless and indemnify EEC for any claims,payments or other liability,including costs and attorney fees incurred by EEC for any damages to subterranean structures which are not called to EEC's attention and correctly shown on the plans furnished to EEC. SECTION 5: Samples EEC will retain all soil and rock samples for 30 days after submission of the report. Further storage or transfer of samples can be made at owner expense upon written request. SECTION 6: Unanticipated Hazardous Materials If shall be the duty of the owner or his representative to advise EEC of any known or suspected hazardous substances which are or may be related to the services provideu;such hazardous substances including but not limited to products,materials,hy-products,wastes or samples of[he foregoing whkh EEC may be provided or obtain performing its services or which hazardous substances exist or may exist on or near any premises upon which work is to be performed by EEC's employees,agents or subcontractors. If during the course of providing services EEC observes or suspects the existence of unanticipated hazardous materials,EEC may at its option terminate further work on the project and notify the client of the condition. Services will be resumed only after a renegotiation of scope of services and fees. In the event that such renegotiation cannot occur to the satisfaction of EEC,EEC may at its option terminate this contract. SECTION 7: Reports and Invoices EEC will furnish three copies of the report to the client. Additional copies will be furnished at the rate specified in the fee schedule. EEC will submit invoices to the client monthly and a final bill upon completion of services. Payment is due upon presentation of invoice and is past due fifteen 15)days from the invoice date. Client agrees to pay a finance charge of one and three-quarters(1 3/4%)per month,but not exceeding the maximum rate allowed by law,on past due accounts. If payment in full is not submitted when due,EEC may immediately cease work. EEC shall be entitled to recover attorney fees, court costs and any other cost of collection which is incurred collecting amounts due on this contract. SECTION 8: Ownership of documents All reports,boring logs,field data,field notes,laboratory test data,calculations,estimates,and other documents prepared by EEC as instruments of service,shall remain the property of EEC,unless there are other contractual agreements. I' y l E EARTH ENGINEERING CONSULTANTS, INC. February 19, 2001 Splittgerber Construction Company 2801 Hearthstone Drive Fort Collins, Colorado 80528 Attn: Mr. Rick Splittgerber Re: Proposal for Preliminary Geotechnical Exploration Splittgerber Development Fort Collins, Colorado Mr. Splittgerber:: We are pleased to submit this proposal to provide subsurface exploration and geotechnical engineering services to you for the referenced project. We understand this project involves the development of approximately 25 acres as single-family residential construction. It is anticipated that approximately 31 homes will be constructed for this project. Those homes are expected to be one or two-story wood frame structures constructed with full basements. Foundation loads for those structures are expected to be light with continuous wall loads less than 2 kips per lineal foot and individual column loads less than 30 kips. Site infrastructure including site utilities and roadways will be constructed for this development. It is anticipated that small grade changes will be required to develop the site grades. To develop preliminary subsurface information on this property, Earth Engineering Consultants, Inc. (EEC)proposes to advance a total of six (6) soil borings. Those borings would extend to depths of approximately 15 feet below present site grades with samples obtained at maximum 5-foot intervals throughout the drilling depth. Laboratory testing would be completed on the recovered samples to evaluate the composition and consistency of the subgrade materials. We anticipate the laboratory testing will include moisture content, dry density, unconfined strength and swell/consolidation tests. After completing the field borings and laboratory testing, we would prepare a preliminary geotechnical report providing a preliminary evaluation of subgrade conditions at the site and an assessment of the impact of those conditions on the proposed construction. Additional exploration will likely be required on a individual basis for the residential structures and the City of Fort Collins requires the exploration for the street design to be completed after the water and sewer have been installed and street subgrades developed. CENTRE FOR ADVANCED TECHNOLOGY 230 I RESEARCH BOULEVARD, SUITE 104 FORT COLLINS, COLORADO 80526 970) 224-1 522 (FAx) 224-4564 Earth Engineering Consultants,Inc. Splittgerber Construction Company February 19, 2001 Page 2 to approximate top-of-subgrade level. The preliminary exploration will help 'identify subgrade conditions which may affect that roadway design. Based on the outlined scope of service, EEC would provide the preliminary geotechnical exploration for a lump sum fee of $2,400. That fee assumes the site is accessible to conventional truck-mounted drilling equipment and is based on the specific scope of services outlined. Should additional services be advisable because of the subsurface conditions encountered, you would be contacted and authorization obtained prior to expanding the scope of this proposal. Our General Conditions for providing the outlined services are attached and are considered a part of our proposal. Prior to completing the field exploration services, EEC personnel would contact the local one-call utility locating service to request that underground utilities be located in proposed drilling areas. The entities not subscribing to the one-call service are suspected of having underground utilities in the development area, those entities should be made known to EEC so that contact can be made concerning the location of those underground facilities. Boring layout completed by EEC will be approximate typically completed by pacing and estimating angles from identifiable site references. We appreciate the opportunity to submit this proposal and look forward to working with you on this project. If you have any questions concerning this proposal, 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. Lester L. Litton, P.E. Principal Engineer NOTICE TO PROCEED ACCEPTED BY: Individual) FOR: Firm) DATE: EARTH ENGINEERING CONSULTANTS, INC. GENERAL CONDITIONS FOR SUBSURFACE EXPLORATION SERVICES Section 1: Scope of Work EARTH ENGINEERING CONSULTANTS,INC.(EEC)shall perform the services defined in the contract and shall invoice the client for those services at the fee schedule rates. Any cost estimates stated in this contract shall not be considered as a firm figure unless otherwise specifically stated in this contract. If unexpected site conditions are discovered,the scope of work may change,even as the work is in progress. EEC will provide these additional service at the contract fee schedule rate. Rates for work beyond the scope of this contract and not covered by the contract fee schedule can be provided. EEC can perform additional work with verbal authorization,and will provide written confirmation of fees,if requested. All costs incurred because ofdelays in authorizing the addition work will be billed to the client. Fee schedules are valid for one year following the date of the contract unless otherwise noted: SECTION 2: Access to Sites Unless otherwise agreed,the client will furnish EEC with right-of-access to the site in order to conduct the planned exploration. While EEC will take all reasonable precautions to minimize any damage to the property,it is understood by the client that in the normal course of work some damage may occur,the restoration of which is not part of this agreement. SECTION 3: Soil Boring Locations The client will furnish EEC with a diagram indicating the location of the site.Test boring locations may also be indicated on the diagram. EEC reserves the right to deviate a reasonable distance from the boring locations specified unless this right is specifically revoked by the client in writing at the time the location diagram is supplied. EEC reserves the right to terminate this contract if conditions preventing drilling at the specified locations are encountered which were not made known to EEC prior to the date of this contract. The accuracy and proximity of provided survey control will affect the accuracy of in-situ test location and elevation determinations. Unless otherwise noted,the accuracy of test locations and elevations will be commensurate only with pacing and approximate measurements or estimates. SECTION 4: Utilities In the performance of its work,EEC will take all reasonable precautions to avoid damage or injury to subterranean structures or utilities. The client agrees to hold EEC harmless and indemnify EEC for any claims,payments or other liability,including costs and attorney fees incurred by EEC for any damages to subterranean structures which are not called to EEC's attention and correctly shown on the plans furnished to EEC. SECTION 5: Samples EEC will retain all soil and rock samples for 30 days after submission of the report. Further storage or transfer of samples can be made at owner expense upon written request. SECTION 6: Unanticipated Hazardous Materials It shall be the duty of the owner or his representative to advise EEC of any known or suspected hazardous substances which are or may be related to the services provided;such hazardous substances including but not limited to products,materials,by-products,wastes or samples o;the foregoin;which EEC may be provided or obtain performing its services or which hazardous substances exist or may exist on or near any premises upon which work is to be performed by EEC's employees,agents or subcontractors. If during the course of providing services EEC observes or suspects the existence of unanticipated hazardous materials,EEC may at its option terminate further work on the project and notify the client of the condition. Services will be resumed only after a renegotiation of scope of services and fees. In the event that such renegotiation cannot occur to the satisfaction of EEC,EEC may at its option terminate this contract. SECTION 7: Reports and Invoices EEC will furnish three copies of the report to the client. Additional copies will be furnished at the rate specified in the fee schedule. EEC will submit invoices to the client monthly and a final bill upon completion of services. Payment is due upon presentation of invoice and is past due fifteen 15)days from the invoice date. Client agrees to pay a finance charge of one and three-quarters(1 3/4%)per month,but not exceeding the maximum rate allowed by law;on past due accounts. If payment in full Is not submitted when due,EEC may immediately cease work. EEC shall be entitled to recover attorney fees; court costs and any other cost of collection which is incurred collecting amounts due on this contract. SECTION 8: Ownership of documents All reports,boring logs,field data,field notes,laboratory test data,calculations,estimates,and other documents prepared by EEC as instruments of service,shall remain the property of EEC,unless there are other contractual agreements. r EARTH ENGINEERING CONSULTANTS, INC. GENERAL CONDITIONS SUBSURFACE EXPLORATION PAGE 2 SECTION 9: Confidentiality EEC shall hold confidential all business or technical information obtained from the client or his affiliates or generated in the performance of services under this agreement and identified in writing by the client as"confidential." EEC shall not disclose such information without the client's consent except to the extent required for 1)Performance of services under this agreement;2)Compliance with professional standards of conduct for preservation of public safety,health,and welfare; 3)Compliance with any court order or other governmental directive.and/or 4)Protection of EEC against claims or liabilities arising from performance of services under this agreement EEC's obligations hereunder shall not apply to information in the public domain or lawfully acquired on a non confidential basis from others. SECTION 10: Standard of Care Services performed by EEC under this agreement will be conducted in the manner consistent with that level of care and skill ordinarily exercised by members of the profession currently practicing under similar conditions. No other warranty,express or implied,is made or intended by the proposal for consulting services or by furnishing oral or written reports of the findings made. The client recognizes that subsurface conditions may vary from those encountered at the location where borings,surveys or explorations are made by EEC and that the data, interpretations and recommendations of EEC,are based solely upon the data available to EEC. EEC will be responsible for those data, interpretations,and recommendations,but shall not be responsible for the interpretation by others of the information developed. SECTION 11: Subpoenas The client is responsible,after notification,for payment of time charges and expenses resulting from our required response to subpoenas issued by any party in conjunction with our work. Charges are based on fee schedules in effect at the time the subpoena is served. SECTION 12: Limitation of Liability The client agrees to limit EEC's liability to the owner and all construction contractors and subcontractors on the project arising from EEC's professional acts, errors,or omissions,such that the total aggregate liability of EEC to all those named shall not exceed S50,000 or EEC's total fee for the services rendered on this project,whichever is greater. The owner further agrees to require of the contractor and Isis subcontractors an identical limitation of EEC's liability for damages suffered by the contractor or the subcontractor'arising from EEC's professional acts,errors,or omissions. Neither the contractor nor any of his subcontractors assumes any liability for damages to others which may arise on account of EEC's professional acts,errors or omissions. SECTION 13: Insurance and Indemnity EEC represents that it and its staff are protected by worker's compensation insurance and that EEC has such coverage under public liability and property damage insurance policies which EEC deems to be adequate.It is the policy of EEC to require certificates of insurance from all consultants or subcontractors employed by EEC. Certificates for all such policies of insurance will be provided to client upon request in writing. Within the limits and conditions of such insurance,EEC agrees to indemnify and save client harmless from and against any loss,damage,injury or liability arising from negligent acts of EEC or its employees. EEC shall not be responsible for any loss,damage or liability beyond the amounts,limits and conditions of such insurance. EEC shall not be responsible for any loss,damage or liability arising from any acts.by a client,its agents,staff or other consultants employed by others. EEC's compensation hereunder is not commensurate with potential risk of injury or loss that may be caused by exposures to pollution,hazardous waste or toxic or other dangerous substances or conditions. Accordingly,except as expressly provided in this contract,the client waives any claim against EEC and agrees to indemnify and save EEC,its agents,and employees harmless from any claim,liability or defense cost for injury or loss sustained by any party from such exposures allegedly arising out of or related to EEC's performance of services hereunder. SECTION 14: Termination This agreement may be terminated by either party upon seven(7)days'written notice in the event of substantial failure by the other party to perform in accordance with the terms hereof. Such.termination shall not be effective if that substantial failure has been remedied before expiration of the period specified in the written notice. In the event of termination,EEC shall be paid for services performed to the termination notice date plus reasonable termination expenses. Expenses of termination or suspension shall include ail direct costs of EEC requires:to complet.analyses sod records necessary to comp'.ete its files and may alas include a report on the services performed to the date of notice of termination or suspension. SECTION 15: Assigns Neither the client nor EEC may delegate,assign,subwrite or transfer its duties or interest in this agreement without the written consent of the other party. SECTION 16: Precedence These Standards,Terms and Conditions shall take precedence over any inconsistent or contradictory provisions contained in any proposal,contract,purchase order,requisition,notice to proceed,or like document regarding EEC's services.