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Home My WebLink AboutB14-0224_B14-0224 REV3 HP Geotech report_1419270660.pdf S _ f--------, v.„..... s,, , ,i.„,A , A , -, ...„--, ',, ,.,i,, .. ...„,g, ,‘;,....;-- ,, HEMORi H-PAWLAK GEOTEECHN!C;ti.'_ December 19, 2014 Aspen Constructors Attn: Wally Sheata 309 AABC, Unit G Aspen, Colorado 81611 wsheata( Speiiconstructors.cam Job No. 114 480A Subject: Compliance of Construction and Materials, EIevator Addition, Clock Tower Store Building, 263 East Gore Creek Drive, Vail, Colorado Gentlemen: Hepworth-Pawlak Geotechnical, Inc. provided construction observation and materials testing services for foundation soil bearing conditions and concrete during construction of the elevator addition. Our field services for the construction began on October 28, 2014 and continued on an as-requested basis through November 21, 2014 and were performed according to our agreement for professional services with Aspen Constructors dated October 28, 2014. Our services were performed under the direction of the undersigned . licensed engineer registered in the State of Colorado. Our testing and observation reports have been distributed under separate cover and are attached for reference. Specific reports distributed consist of the excavation bearing observation report dated October 29, and concrete test reports for concrete placed November 11 and November 21, 2014. Based on inferences drawn from our observations during construction and the results of our testing as documented by the referenced field and laboratory reports, it is our professional opinion that the referenced soil bearing conditions and concrete for the project has achieved the specified conditions, and/or currently accepted industry practices as applicable. Please recognize that construction observation and testing are sampling functions that involve direct observation and testing of very limited amount of the overall work to evaluate the construction compliance. If you have any questions, please contact the undersigned. Sincerely, HEPWORTH -PAWLAK GEOTECHNICAL, INC. Steven L. Pawlak, P.E. ' SLP/ksw .. 1J/> /ai , Attachments: Observation o 7,: 6t:' 11 eport, dated October 29, 2014 Windsor Probe Concrete Test Report, dated November 21, 2014 Concrete Test Report, dated November 21, 2014 Parker 303-841-7119 • Colorado Springy, 719-633-5562 • Silverthorne 970-468-1989 • October 29, 2014 Aspen Constructors, Inc. Attn: Wally Sheata 309 AABC, Unit G Aspen, Colorado 81611 Job No. 114 480A Subject: Observation of Excavation, Proposed Elevator Addition, Clock Tower Store Building, 263 East Gore Creels Drive, Vail, Colorado Dear Wally: As requested, a representative of Hepworth-Pawlak Geotechnical, Inc. observed the excavation at the subject site on October 28, 2014 to evaluate the soils exposed for foundation support. The findings of our observations and reconnnendations for the foundation design are presented in this report. We previously conducted a subsoil study for design of foundations at the site for a different proposed building construction and presented our findings in a report dated February 29, 2008, Job No. 107 0788. The current observation was conducted according to you agreement for services with Aspen Constructors dated October 28, 2014. The proposed construction includes a remodel of the existing building. As part of the remodel work an elevator is being added to the structure, including an elevator foundation pit at basement level. Project plans, prepared by Pierce+Frye, dated September 18, 2014, indicate a design soil bearing pressure of 2,500 psf for the elevator pit footing bearing on natural site soils. At the time of our visit to the site, the elevator foundation pit excavation had been cut in one level approximately 5 feet below the adjacent basement level slab grade in the interior of the building. The soils exposed in the bottom of the excavation consisted of natural sandy gravel and cobbles. No free water was encountered in the excavation and the soils were moist. The soil conditions exposed in the excavation are suitable for support of spread footings constructed for the assumed design bearing pressure of 2,500 psf Loose and disturbed soils should be removed in the footing areas to expose the undisturbed natural soils. The recommendations submitted in this letter are based on our observation of the soils exposed within the foundation excavation and the previous subsurface exploration at the siLe. aiiiaiUurs in the subsurface conditions including goundwater level fluctuations Aspen Constructors, Inc. October 29, 2014 Page 2 below the excavation could increase.the risk of foundation movement. We should be advised of any variations encountered in the excavation conditions for possible changes to 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, HEPWORTH—PAWLAK GEOTECHNICAL, INC. James A. Parker, P.E., P.G. Reviewed by: Steven L. Pawlak, P.E. JAP/ksw • Job No. 114480A C�-otech .. 5020 County Road 154 GeeteC r^—1 Glenwood Springs, CO 81601 Phone: 970-945-7988 HEPWORTH-PAWLAK GEOTECHNICAL Fax: 970-945-8454 hpgeo@hpgeotech.com WINDSOR PROBE CONCRETE TEST REPORT Client: Aspen Constructors, Inc. Job No.: 114 480A Day: Friday Attn: Wally Sheata Date: 11/21/14 309 AABC, Unit G Sheet: 1 of 1 Aspen, Colorado 81611 Project: Proposed Elevator Addition, Clock Tower Store Building, 263 East Gore Creek Drive, Vail, Colorado Test Location: Elevator Pit South Wall Concrete Information Concrete Age: 10 days 28 Day Design Strength: 4000 psi Approximate 12"+ Thickness: Aggregate Size: 3/s" Aggregate Moh's No: 6 Surface Description: Smooth Form Finish Test Information Driver Unit I.D. No. 133550 Power Level: Standard Probe Length: 3.125 in. Compressive Strength Probe 1 Probe 2 Probe 3 Average Exposed Probe (in) 1.78 1.70 1.71 1.73 Compressive Strength (psi) 3660 3005 3150 3270 Notes: Distribution: Aspen Constructors, Inc. -Wally Sheata(wsheata@aspenconstructors.com) Thomas J. Westhoff, CET Steven L. Pawlak, P.E. Field Technician Reviewed By 5020 County Road 154 Geejech Glenwood Springs, CO 81601 Phone: 5-7988 Fax: 970-945-8454 HEPWORTH-PAWLAK GEOTECHNICAL hpgeo@hpgeotech.com CONCRETE TEST REPORT Aspen Constructors, Inc. Job No. 114 480A Attn: Wally Sheata Date Cast: 11-21-14 309 AABC, Unit G Aspen, Colorado 81611 Sheet 1 of 1 Project: Proposed Elevator Addition, Clock Tower Store Building, 263 East Gore Creek Drive, Vail, Colorado Placement Location: Elevator Pit North, East and West Walls Supplier: United Time Batched: 2:20 pm Load Size (Yds): 4 Truck No: 0000 Time Arrived: 2:40 pm Yds Delivered: 4 Ticket No: 33503015 Time Placed: 2:50 pm Yds Ordered: 4 Mix Design: 37610444 3/8 line pump Method of Placement: Pump Sample Point: Truck Discharge Time Sampled: 2:55 pm Wet Unit Wt 138.8 pcf Air Temp: 41° Slump: 4% inches Concrete Temp: 60° Air Content: 5.1 0/0 Water Added: None Communication: The Supplier was informed of our field test results. Time Cylinders Cast: 3:05 pm Initial Cure Time On Site: 3 days Field Storage: Insulated cure box inside heated building Date in Lab: 11-24-14 Cylinder Temperature at Pick Up: 59° Min/Max: 52°/83° Compressive Strength Data 2014 Compressive Lab Age Date Load Diameter Area p 28 Day Number Days lbs. in. in2 Strength (psi) Avg. (psi) 792A 7 11-28-14 64,060 4.01 12.63 5070 792B 28 12-19-14 85,900 4.01 12.63 6800 792C 28 12-19-14 86,800 4.01 12.63 6870 6840 792D Hold/56 Discarded Specified Strength for Structure: 4000 psi at 28 days Specified Strength for Mix: 4500 psi at 28 days Notes: Distribution: Aspen Constructors, Inc. -Wally Sheata(wsheata(a7aspenconstructors.com) United—Holly Martin(Holly.martialdcastle-materials.com) United-Misty Grosse(Mistv.Murr(a�united-gi.com) Tom Westhoff, CET David A. Young, P.E. Field Technician Reviewed By /Ijf