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Home My WebLink AboutSubsoils Report for Foundation Designl GEOTECH NICAL INVESTIGATION REPORT Single-Family Residence 9109 County Road 311 Silt, Colorado , Geo Quest Project No,: 24-154 June 4,2024 Prepared for: Ross Mark Talbott 9109 County Road 311 Silt, Colorado 81652 Prepared by: Geo Quest, LLC PO Box 1372 Rifle, CO 81550 Phone: 97O-3L8-6784 $: 1l '' 6Eo Q&H#'r {s?*3 srs-s?*4 F0 S*x'l$Tt ftifle, ** S1$SS g*.sq*,lestc*Spm,rng jlt !li$, ,#{,t. 1,ii 't TABLE OF CONTENTS 1.0 PURPOSE AND SCOPE OF STUDY. 2.0 PROPOSED CONSTRUCTION 3.0 stTE coNDtTtoNs............... 4.0 SUBSURFACE INVESTIGATION 5.0 suBsuRFAcE coNDtTtoNs............... 6.0 RECOMMENDAT|ONS............. 4.]. FIELD EXPLoRATIoN 4.2 LABoRATonv Tesrtrue . L L 2 3 3 4 4 6 6 6 7 8 8 8 8 8 9 5.4 DRATNAGT CorustoeRnloNs.......... 7.0 EARTHWORK RECOMMENDATIONS. 7.1 SITE GRUBBING AND STRIPPING 7.2 BUILDING PAD PREPARATION .........,.,.. 7.3 Frr-l MnrEnrnl 7.4 Corupncrton ReeutnrruENTs............. u*J' Proposed Single-Family Residence Silt, Colorado Geo Quest No. 24-154 1.0 PURPOSE AND SCOPE OF STUDY This report presents the results of our geotechnical investigation for a single-family residence south of Silt, Colorado with the following legal description: Parcel: 24077L40LO02, Section: 11, Township: 7, Range: 92, Lot: 2 in the Eagles View Subdivision Our scope of services included a subsurface investigation, laboratory testing, geotechnical engineering analyses, and preparation of this report. The purposes of this investigation were to evaluate the subsurface conditions at the site and to develop geotechnical recommendations to guide design and construction of the proposed single-family residence and OWTS. An OWTS soil evaluation will be delivered as a companion document to this report. Our scope of services included the following: o Observe and log test pits to evaluate the subsurface conditions at the proposed building site. r Laboratory testing of the soils encountered during the field exploration to evaluate pertinent engineering properties of the soil. r Foundation design recommendations, including allowable bearing pressure, approximate depth to bearing stratum, and estimated movement. r Floor slab design considerations and floor slab subgrade preparation recommendations. r Earthwork, including recommendations for fill placement and compaction, suitability of the site soil for reuse as engineered fill, and subgrade preparation. 2.0 PROPOSED CONSTRUCTION The project will consist of constructing a new single-family residence. The location of the project site is presented in Figure t, Project Location Map.The project will include the construction of a one to two story, lightly-loaded residential structure with a crawl space, OWTS and associated infrastructure. The approximate northwest and northeast corners of the building were staked at the time of our field investigation. A site grading plan was not available when this report was prepared. lt was assumed that grade changes of less than 4 feet will be required to develop the final site grades. 1. Proposed Single-Family Residence Silt, Colorado Geo Quest No.24-154 f;l ri t, Figure 2 - view looking north. TP-l is on the left and TP-2 is on the right. 4.0 SUBSURFACE INVESTIGATION 4.1 Field Exploration Four test pits were excavated on April 30,2024 to depths of 5 to 9 feet with a Bobcat excavator. Test Pit 1 (TP-1) and Test Pit 2 (TP-2)were located on the west and east side of the proposed house location while Test Pit 3 and Test Pit 4 were located approximately 180 feet to the south at the OWTS location. The proposed house location and OWTS area were marked with stakes at the time of our field investigation. The approximate test pit locations are indicated on the Test Pit Locotion P/on attached in Appendix A. Bulk samples and hand drive samples of the subsurface materials were obtained from the test pits at select depths for testing and identification of each material layer. The excavations were backfilled with the excavated soil when completed. 3 qFV Proposed Single-Family Residence Silt, Colorado Geo Quest No. 24-154 Approximately 3 feet to the cobble, gravel and sand layer in TP-1 Boulders .! rili it i : Figure 3 - rcft photo: View looking north in TP-l at material layer change. Right photo: Note boulders Figure 4 - close up view of the boulders, cobbles, gravels and sand 5 -r{t Proposed Single-Family Residence Silt, Colorado Geo Quest No. 24-154 Controljoints should be provided in slabs to control the location and extent of cracking. lnterior trench backfill placed beneath slabs should be compacted in accordance with recommended specifications outlined herein. Barriers to reduce the potential for vapor rise through the slab are recommended. Floor slabs should not be constructed on frozen subgrade. Other design and construction considerations, as outlined in Section 302.1 R of the "ACl Design Manual", are recommended. 5.4 Drainage Considerations Properly functioning foundations and slabs on grade require appropriately constructed and maintained site drainage conditions. Therefore, it is extremely important that positive drainage be provided during construction and maintained throughout the life of the structures. lt is also important that proper planning and control of landscape and irrigation be performed. The building should be provided with downspout extensions to direct water away from the structures. The downspouts should discharge into drainage swales or sloped surfaces that move water away from the structure. lnfiltration of water into utility or foundation excavations must be prevented during construction. 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 potential for moisture infiltration. ln areas where sidewalks, patios, or driveways do not immediately adjoin the structures, the ground surface adjacent to the structures should slope down at a grade of about five percent for a distance of at least 10 feet from the perimeter walls. Planters or other surface features that could retain water adjacent to the structures should be avoided. lf planters and/or landscaping are adjacent to or near the structures, we recommend the following: I Grades should slope away from the structures. Planters should slope away from the structures and should not pond water. Drains should be installed in enclosed planters to facilitate flow out of the planters. Watering within 10 feet of the structure should be kept to a minimum. lrrigation systems should be situated on the far side of any planting and away from the buildings to reduce the potential for infiltration beneath the structure from possible leaks. A minimum horizontal distance of 36 inches should be maintained between the building foundations and shallow-rooted plants. ln a like manner, for deeper-rooted plants, a minimum of 72 inches should be maintained between the building foundations and the plants. lt's advisable that deeper-rooted plants have a low water requirement. Trees should be planted no closer than a distance equal to one-half their mature height or fifteen feet, whichever is greater, from the buildings. 7 I i, I Proposed Single-Family Residence Silt, Colorado Geo Quest No.24-154 8.0 LIMITATIONS The recommendations in this report are based on our field observations, laboratory testing, and our present understanding of the proposed construction. lt is possible that subsurface conditions can vary beyond the limits explored. lf the conditions found during construction differ from those described in this report, please notify Geo Quest immediately so that we can review our report considering those conditions and provide supplemental recommendations as necessary. We should also review this report if the scope of the proposed construction, including the proposed loads or structure locations, changes from that described in this report. This report was prepared in substantial accordance with the generally accepted standards of practice for geotechnical engineering as they exist in the site area at the time of our investigation. No warranty is expressed or implied. 9 't :16. _"\.!l: Proposed Single-Family Residence Silt, Colorado Geo Quest No.24-154 TT$T PIT TSCATION MAP srir6rE FAMfi"? RgslgfNcf AllD owTs Appendlxr*lob frlo,: 24*15{ TF4 .t$!{6&ii'w l* Pit l#rlos &&o Sergsrr LL