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Home My WebLink About639 Stoneham Ct - Correspondence - 01/01/2000July 13, 1999 Melody Homes 11031 Sheridan Boulevard Westminster, Colorado 80020 Attn: Mr. Shawn Weiman Re: Lot 54, Ridgewood Hills PUD Second Filing 639 Stoneham Court Fort Collins, Colorado Project No. 20985076 Reference: Geotechnical Engineering Report Ridgewood Hills PUD Second Filing Project No. 20965040, Dated April 19, 1996 Irerracon 301 N. Howes • P.O. Box 503 Fort Collins, Colorado 80521 0503 (970) 484-0359 Fax-. (970) 484-0454 994672 Terracon has completed a geotechnical engineering exploration for the proposed residence to be constructed on the above -referenced lot. One test boring was drilled in the approximate center of the lot and a relatively undisturbed sample was obtained for laboratory testing and analysis. The sample was collected in field by means of pushing a cylindrical Shelby tube or by driving a ring barrel sampler. Penetration resistance measurements were obtained by driving the split -spoon sampler and the ring barrel into the subsurface materials with a 140-pound hammer falling 30 inches. The penetration resistance values as presented on the enclosed Log of Boring are a useful index in estimating the consistency, relative density or hardness of the materials encountered. The laboratory swell -consolidation test results, performed in general accordance with ASTM procedures, for a -sample analyzed at -a depth of 3.0 feet; is enclosed with this letter. The materials tested on the above -referenced lot are classified as low swelling based on the Colorado Association of Geotechnical Engineers (CAGE) criteria. Geotechnical recommendations for design of foundations and other earth connected phases of this residence were developed based on the referenced exploration for the overall subdivision, and the borings drilled in this and adjacent lots. Terracon's geotechnical engineering recommendations based on the field and laboratory test results are summarized below. Foundation Recommendations Spread footing foundations bearing upon undisturbed subsoils, re -compacted native soils and/or imported fill material are recommended for support of the proposed structure. Arizona ■ Arkansas ■ Colorado ■ Idaho ■ Illinois ■ Iowa IN Kansas ■ Minnesota ■ Missouri ■ Montana Nebraska ■ Nevada ■ New Mexico ■ North Dakota ■ Oklahoma ■ Tennessee ■ Texas ■ Utah ■ Wisconsin ■ Wyoming Quality Engineering Since 1965 Terracon Geotechnical Engineering Report Ridgewood Hill — 2"' Filing, Stoneham Court Page 2 Terracon Project No. 20985076 Basement Construction Groundwater was not encountered on this lot to maximum depths of exploration, 19.5 feet during initial drilling operations. When checked 24 hours after drilling, groundwater was measured at a depth of 15.5 feet. Bedrock was encountered at an approximate depth of 11.5 feet. Full -depth basement construction is considered acceptable, provided a complete dewatering system is provided around the lower basement area. The dewatering system should contain a drain constructed around the exterior perimeter of the basement foundation and sloped at a minimum 1/8 inch per foot to a suitable outlet, such as a sump or area drain. The drainage system should consist of a properly sized perforated pipe placed in a trench at least 12 inches in width. The pipe should be placed on filter fabric. Gravel should be placed around the pipe and extend a minimum of 12 inches above the pipe. The gravel should be covered with drainage fabric prior to placement of foundation backfill. Floor Slab Design and Construction The variability of the existing soils at approximate slab subgrade elevation could result in differential movement of floor slab -on -grade should the expansive soils increase in moisture content. Based on the CAGE criteria, the subsoils at the site have a slab performance risk category of "low". Movement not likely to exceed up to 2 inches or more is estimated if the subsoils below slabs become wetted for a zone of approximately 10 feet below the basement. Slab -on - grade construction for the basement of this residence should perform in accordance with the above criteria. The homeowner should be aware of the risk of this slab movement and should take this into account prior to purchasing the residence. Surface Drainage Positive drainage should be provided during construction and maintained throughout the life of the proposed residence. Planters and other surface features, which could retain water in areas adjacent to the building or pavements, should be sealed or eliminated. In areas where sidewalks or paving do not immediately adjoin the structure, we recommend that protective slopes be provided with a minimum grade of approximately 10 percent for at least 10 feet from perimeter walls where possible and at a minimum approximately 10 percent for at least 5 Terracon Geotechnical Engineering Report Ridgewood Hill — 2nd Filing, Stoneham Court Page 3 Terracon Project No. 20985076 feet from perimeter walls. Backfill against footings, exterior walls and in utility and sprinkler line trenches should be well compacted and free of all construction debris to reduce the possibility of moisture infiltration. Downspouts, roof drains or scuppers must discharge into splash blocks or extensions when the ground surface beneath such features is not protected by exterior slabs or paving. Sprinkler systems should not be installed or irrigate within 5 feet of foundation walls. Construction Observation The following observations are recommended during construction: • Footing sizes and void form placement; • Wall steel; • Perimeter drain; and • Basement slab We appreciate the opportunity to be of service to you on this phase of your project. If you have any questions concerning this letter report, or if we may be of further service to you, please do not hesitate -to- contact us: Sincerely, Rf6�s�F TERRACON o�Ppp o:.•,�o p Rig•. Prep By: l 27712 avid A. Riche P.E. �^FS••''••' , Geotechnical Engineer/Department F�� Reviewed by: William J. Attwooll, P.E. Office Manager Enclosures (2): Log of Boring Swell Consolidation Curve Copies to: Addressee (3) LOG OF TEST BORING FOR LOT 54 Page 1 of 1 CLIENT ARCHITECT/ENGINEER Melody Homes SITE Stoneham Court PROJECr Fort Collins, Colorado Ridgewood Hills PUD Second Filing SAMPLES TESTS K W m r. z W d F r K W M, O U K F LL z\ I N7 3 F-O 0W X W K D F Vl H r- r F H w z W 0 rtLL Od G W zx H 1- U. CD z z O W U KLL N Ja. O O J U H 2 d C7 DESCRIPTION Soil Description per Depth of Exploration !- U. S F d O J O /o = r W N U FU I -Sandy T pan Clay Brown, moist, stiff CL 1 SS 12" 13 2.0 SANDY T_RAN CT.AY Brown, moist, medium to stiff CL 2 ST 12" 3 SS 12' 7 5 4 SS 12" 8 10 11.5 WEATHERED STT .TSTONIE/SAND STONF. 13.0 Brown, moist —_ So8/poorly cemented STT.TSTONE/SANDSTONE 5 SS 6" 501.5 Brown, moist 15 Moderately hard/poorly cemented = _ 6 SS 6" 501.5 19.5 BOTTOM OF BORING THE STRATIFICATION LINES REPRESENT THE APPROXIMATE BOUNDARY LINES BETWEEW SOIL AND ROCK TYPES:- lif-WITU, TRE- TRANS'aTTON- MAY BE -GRADUAL. WATER LEVEL OBSERVATIONS rerracon BORING STARTED 6-21-99 Q None W.D. = 15.7' Al RING COMPLETED -" CME-55 FOREMAN CJS I Water checked 1 day A.B. APPROVED DAR JOB r 20985076 s w E L L C O N s O L I D A T I O N 01 APPLIED "XMUM, TSF Boring and depth (ft.) Classification DD MC% 101 LOT 54 3.0 Sandy Lean Clay 90 13 PROJECT Ridgewood Hills PUD Second Filing - JOB NO. 20985076 Stoneham Court DATE 7/9/99 CONSOLIDATION TEST TERRACON