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HomeMy WebLinkAboutB14-0104 soils report.pdfTOWll OF~ Department of Community Development 75 South Frontage Road Vail, CO 81657 Tel: 970.479.2128 www.vailgov.com Development Review Coordinator TRANSMITTAL FORM Use this form when submitting additional information for planning applications or building permits. This form is also used for requesting a revision to building permits. A two hour minimum building review fee of $110 will be charged upon reissuance of the permit. Application/Permit #(s) information applies to: Project Street Address: Attention: ( ) Revisions ( ) Response to Correction Letter _attached copy of correction letter ( ) Deferred Submittal \ 4- ()Q. Other OffXl ·h\o e__~u. ~el &.ev0/ Q:t~ Gv-de... __ _ (Number) (Street) Applicant. Information (architect, contractor, owner/owner's rep) Contact Name: ~V\ M,c-411'"' \ e/ Address: 'PO ~ ?S2.1: (Suite#) Description of Transmittal/ List of Changes, Items Attached: City t:".@.0 le.-State: kD_ . Zip: ~l£3 l Contact Name: M~JJ M·.\-n • ·ful'\li.}:> -(u_s_e_a-dd-i-tio_n_a_I s-h-e-et-if_n_e_c-es_s_a_ry_) ----------- Contact Phone: Cj:::J..-O-· ±:t-f-<i$2a ~ Building Permits: ..--..,, Jc L. ~-\ '.'>Revised ADDITIONAL Valuations (Labor & Materials) Contact E-Mail: 581c\il "'° t'VIL!l ~vlYl"UVVT1RiV'-hcffli-'.. (DO NOT include original valuation) • c...:D~. I hereby acknowledge that I have read this application, filled out Building: $ ________ _ in full the information required, completed an accurate plot plan, and state that all the information as required is correct. I agree to Plumbing: comply with the information and plot plan, to comply with all Town ordinances and state laws, and to build this structure according to the town's zoning and subdivision codes, design review ap- proved, International Building and Residential Codes and other Electrical: Mechanical: ordinances the Town applicable thereto. Total: Representative Signature (Required) Date Received: For Office Use Only: Fee Paid: __________________ _ Received From: ________________ _ Cash _________ Check# _______ _ CC: Visa I MC Last 4 CC # exp. date: ____ _ Authorization# _________________ _ D ~©~OW~ JUN 09 2014 TOWN OF VAIL HEPWORTH-PAWLAK GEOTECHNICAL June 5, 2014 Meadow Mountain Homes Attn: Tom (Bo) Wood P.O. Box 5527 Eagle, Colorado 81631 (tom@meadowmountainhomes.com) HL'j'm1rt h-l'all'Li~ Cin>tL·chnic:.d. Inc. 'il~2l~ C .. 11nr1 !~""'' I 'i-1 ( lknw1 ",,j ~rrinc;" ( :, il"r.1d1' .-: I (1l' I l'l"111c· LJ/(LIJ-!i-/9:-i«' JUN 09 2014 TOWN OF VAIL Job No. 114 185A Subject: Observation of Excavation, Proposed Garage and Bedroom Addition, Lot 1, Block 4, Vail Valley Third Filing, 381 Beaver Dam Circle, Vail, Colorado Gentlemen: As requested by Bo Wood, a representative of Hepworth-Pawlak Geotechnical, Inc. observed the excavation at the subject site on May 21, 30 and June 3, 2014 to evaluate the soils exposed for foundation support. The findings of our observations and recommendations for the foundation design are presented in this report. The services were performed in accordance with our agreement for professional engineering services to Meadow Mountain Homes, dated May 20, 2014. The addition will be attached to the south and west sides of the existing residence. Spread footings placed on the natural soils and designed for an allowable bearing pressure of2,000 psfwere assumed for the addition support. At the time of our initial site visits on May 21 and 30, the foundation excavation was in progress and had encountered considerable crushed rock backfill from the original construction and groundwater seepage. Collecting and discharging the water seepage was recommended. When observed on June 3, the excavation had been cut in 3 levels from about 10 to 15 feet below the adjacent ground surface. Bottom of the adjacent existing footings were exposed. The soils exposed in the bottom of the excavation consisted of clayey sandy gravel and cobbles with boulders. The results of gradation analyses performed on samples of the gravel (minus 5 inch fraction) obtained from the site are presented on Figure 1. The excavation was typically dry except for a small amount of seepage at the southwest comer and the soils were moist to very moist. There is a small stream along the west side of the lot which may be contributing to the groundwater seepage. Considering the conditions exposed in the excavation and the nature of the proposed construction, spread footings placed on the undisturbed natural gravel soil designed for an allowable soil bearing pressure of2,000 psf should be adequate for support of the proposed addition. There could be some post-construction settlement of the foundation differential to the existing building which should be considered in the design. Footings Meadow Mountain Homes June 5, 2014 Page 2 should be a minimum width of 16 inches for continuous walls and 2 feet for columns. Loose and disturbed soils in footing areas should be removed and the bearing level extended down to the undisturbed natural soils. Exterior footings should be provided with adequate soil cover above their bearing elevations for frost protection. Continuous foundation walls should be reinforced top and bottom to span local anomalies such as by assuming an unsupported length of at least I 2 feet. Foundation walls acting as retaining structures should also be designed to resist a lateral earth pressure based on an equivalent fluid unit weight of at least 50 pcf for on-site granular soil as backfill. A perimeter foundation drain should be provided to prevent temporary buildup of hydrostatic pressure behind the basement walls and prevent wetting of the lower level. The underdrain may be connected to the existing foundation drain provided it is functioning properly. Structural fill placed within floor slab areas can consist of the on-site soils compacted to at least 95% of standard Proctor density at a moisture content near optimum. Backfill placed around the structure should be compacted and the surface graded to prevent ponding within at least 10 feet of the building. Landscape that requires regular heavy irrigation, such as sod, and sprinkler heads should not be located within 5 feet of the foundation. The recommendations submitted in this letter are based on our observation of the soils exposed within the foundation excavation and do not include subsurface exploration to evaluate the subsurface conditions within the loaded depth of foundation influence. This study is based on the assumption that soils beneath the footings have equal or better support than those exposed. The risk of foundation movement may be greater than indicated in this report because of possible variations in the subsurface conditions. In order to reveal the nature and extent of variations in the subsurface conditions below the excavation, drilling would be required. It is possible the data obtained by subsurface exploration could change the recommendations contained in this letter. Our services do not include determining the presence, prevention or possibility of mold or other biological contaminants (MOBC) developing in the future. If the client is concerned about MOBC, then a professional in this special field of practice should be consulted. If you have any questions or need further assistance, please call our office. Sincerely, Steven L. Pawlak, P. SLP/ljg Attachment: Figure l -Gradation Test Results Job No. 114 185A HYDROMETER ANALYSIS SIEVE ANALYSIS I TIME READINGS I U.S. STANDARD SERIES I CLEAR SQUARE OPENINGS I 245t1 7HR 4 IN.15 MIN. 60MIN19MIN.4 MIN. 1 MIN. 0 #200 #100 #50 #30 #16 #8 #4 3/8" 3/4' 1 1/2' 3• 5'6' B" 100 10 90 - Cl 20 80 LU CJ z 30 70 z ~ -Ci5 (/) 40 60 ct. a: I-I-z 50 so z w LU () () a: 60 411 a: w w 0.. c.. -70 30 80 20 90 10 100 0 .001 .002 .005 .009 .019 .037 .D14 .150 .300 .600 1.18 2.36 4.75 9.5 12.5 19.f) 37.5 711.2 152 203 127 DIAMETER OF PARTICLES IN MIWMETERS ClAVlOSILT I §!!:!~ !COARSE I GRAVEL I COBBLES FINE I MEDIUM RNE I COAASE GRAVEL 44 % SAND 32 % SILT AND CLAY 24 % SAMPLE OF: Clayey Sandy Gravel with Cobbles FROM: Pit, West End, 5-21-14 HYDROMETER ANALYSIS SIEVE ANALYSIS H TIME READINGS I U.S. STANDARD SERIES I CLEAR SQUARE OPENINGS I ~~ Mki.1~ Mt. 60MIN19MIN.4 MIN. 1 MIN. #200 #100 #50 #30 #16 #8 #4 3/8' 3/4' 11/2' 3" 5"6" 8" 0 100 10 90 0 20 80 LU CJ z 30 70 z ~ Ci5 (/) 40 60 ct. a: ~ I- 50 50 z w w () () a: 60 40 ffi LU a._ (1... 70 30 80 20 90 10 100 0 .001 .002 .005 .009 .019 .037 .074 .150 .300 .600 1.18 2.36 4.75 9.S.,2,519.0 37.5 76.2 12}52 203 DIAMETER OF PARTICLES IN MILLIMETERS CLAY TO SILT I SANO ICOAASE I GRAllEL I COBBLES Fl1'E I MEDIUM FINE I COAASE GRAVEL 50 % SAND 22 % SILT AND CLAY 28 % SAMPLE OF: Clayey Sandy Gravel FROM: Bottom of Excavation, South Side, 6-3-14 114 185A ~ GRADATION TEST RESULTS FIGURE 5 HEPWORTH-PAWLAK GEOTECHNICAL