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Home My WebLink About6920 Sedgwick Ct - Special Inspections/Engineering - 12/15/1998Irerracon 301 N. Howes • P.O. Box 503 Fort Collins, Colorado 80521-0503 (970) 484-0359 Fax: (970) 484-0454 December 15, 1998 Melody Homes 11031 Sheridan Boulevard Westminster, Colorado 80020 Attn: Mr. Shawn Weiman Re: Lot 96, Ridgewood Hills, Second Filing �6920-Sedgwick Court Fort -Collins —Colorado Project No. 20985076 Gentlemen: Terracon observed the foundation construction for the referenced project on December 4 and 10, 1998. Observations made during the foundation construction indicate that the foundation footing sizes and void form and foundation wall steel placements are in accordance with the plans and specifications for this project. Sincerely, TERRACON K , �d, Connie J. Luster, E.I.T. Geotechnical Engineer Copies to: (6) Addressee Reviewed by: 11isa R. Schoenfeld, P.E. Geotechnical Engineer r,�RE�is� • SC ,.••. • s�IioF•.F� o.� 2310� 0: 4NAt E Arizona ■ Arkansas ■ Colorado III Idaho ■ Illinois ■ Iowa ■ Kansas ■ Minnesota ■ Missouri ■ Montana Nebraska ■ Nevada ■ New Mexico ■ North Dakota ■ Oklahoma ■ Tennessee ■ Texas ■ Utah ■ Wisconsin ■ Wyoming Quality Engineering Since 1965 Irerracon 301 N. Howes • P.O. Box 503 Fort Collins,'Colorado 80521-0503 (970) 484-0359 Fax: (970) 484-0454 January 7, 1999 Melody Homes 11031 Sheridan Boulevard Westminster, Colorado 80020 Re: Lot 96, Ridgewood Hills PUD, Second Filing 6920 Sedgwick Court Fort Collins, Colorado Project No. 20985076 Gentlemen: Terracon observed the perimeter drain at the referenced site on December 28, 1998. At the time of the site visit, it was observed that 4-inch diameter, perforated PVC pipe had been placed around the exterior perimeter of the basement foundation. The drainage pipe exhibited positive drainage toward the sumps in the southwest and northeast corners of the basement. Maximum 1 Y.-inch washed aggregate was observed above the pipe. Layers of filter fabric were observed beneath the pipe and above the gravel. In addition, the void forms were observed to be in good condition at the time of our site visit. Sincerely, �PpC REr�s TERRACON Reviewed by: 10F°lF�� r Connie J. Luster, E.I.T. isa R. Schoenfeld, P. o Geotechnical Engineer Geotechnical Engineer F�'s%NAB Copies to: (6) Addressee Arizona ■ Arkansas ■ Colorado ■ Idaho ■ Illinois ■ Iowa ■ Kansas ■ Minnesota ■ Missouri ■ Montana Nebraska ■ Nevada ■ New Mexico ■ North Dakota ■ Oklahoma ■ Tennessee ■ Texas ■ Utah ■ Wisconsin ■ Wyoming Quality Engineering Since 1965 August 19, 1998 Melody Homes 11031 Sheridan Boulevard Westminster, Colorado 80020 Attn: Mr. Shawn Weiman Re: Lot 96, Ridgewood Hills PUD Second Filing 6920 Sedgwick 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 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 materials tested on the site 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 recommendations are summarized below. Foundation Recommendations Spread footing foundations bearing upon undisturbed subsoils, recompacted native soils and/or bedrock are recommended for support of the proposed structure. Basement Construction Groundwater was not encountered on this lot to the depth explored. Bedrock was not encountered to the depth explored. 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. Arizona ■ Arkansas ■ Colorado ■ Idaho ■ Illinois ■ Iowa ■ Kansas 0 Minnesota ■ Missouri ■ Montana Nebraska ■ Nevada ■ New Mexico ■ North Dakota ■ Oklahoma ■ Tennessee ■ Texas ■ Utah ■ Wisconsin ■ Wyoming Quality Engineering Since 1965 Terracon Melody Homes Page 2 Project No. 20985076 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 6 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 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. Terracon Melody Homes Page 3 Project No. 20985076 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, TERRACON Doug Leafgre�,, Staff Geologist Of PROfFss/o e . 1M08 i AIPG �F�Fo�9s M. LEAEGQ Copies to: Addressee (3) Reviewed b Ppo REGI //Z William J. Attwooll, Re- Office Manager %�-� •••. :�`,� �s8O N AI I 111\\