The URL can be used to link to this page

Home My WebLink AboutObservation of Excavation & Compaction Testing 10.23.2019ICH -A Kumar 8Associates,,Isc.e 4/ 5953 Geotechnical and Materials Engineers and Environmental Scientists Fes' An Employee Owned Company r 5020 County Road 154 Glenwood Springs, CO 81601 phone: (970) 945-7988 fax: (970) 945-8454 email: kaglenwood@kumarusa.com www.kumarusa.com Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado October 23, 2019 Bob Gibson 3092 Walnut Place Grand Junction, Colorado 81504 bob (iib t.l i 1 d withrm. co ni Subject: Gentlemen: kAuodryt ,0 989.201 Project No. 19-7-337.A Observation of Excavation and Compaction Testing, Proposed Residence, Lot FW -6, The Fairways, Aspen Glen, Golden Bear, Garfield County, Colorado As requested, a representative of Kumar & Associates, Inc. observed the foundation excavation at the subject site on October 14, 2019 and performed in-place density testing on structural fill placed for foundation support. The findings of our observations and test results are presented in this report. We previously provided updated findings of a subsoil study conducted on the site for foundation design in a report dated June 18, 2019, Project No. 19-7-337. The residence will be 1 and 2 -story construction supported on spread footings placed on 3 feet of compacted structural fill sized for an allowable bearing pressure of 2,500 psf. At the time of our initial visit to the site, the foundation excavation had been cut in one level from 4 to 6 feet below the adjacent perimeter ground surface including 3 feet of sub -excavation depth. The soils exposed in the bottom of the excavation had been moistened and compacted and consisted of sandy silty clay. No free water was encountered in the excavation and the soils were slightly moist to moist. Results of in-place moisture -density tests taken on the clay soils placed as structural fill below footing areas, presented in the attached Earthwork Compaction Testing Reports, indicate adequate compaction at near optimum moisture content. The soil conditions exposed in the excavation are consistent with those previously encountered on the site and suitable for support of spread footings placed on the compacted structural fill designed for the allowable bearing pressure of 2,500 psf. Loose disturbed soils in the footing areas should be moistened and compacted. The bearing soils should be protected from frost and concrete should not be placed on frozen soils. Other recommendations presented in our previous report which are applicable should also be observed. Bob Gibson October 23, 2019 Page 2 If you have any questions or need further assistance, please call our office. Sincerely, Kumar & Associates Steven L. Pawl SLP/kac Attachments: Earthw action Testing Reports: October 15 & 16, 2019 cc: RM Construction — Jason Norris (Jason@buildwithrin.coin) Kumar & Associates; Inc. ® Project No. 19-7-337.A 1 I + G o c n A> I1atona s En;i �ealechnical and �1aerials Engineers and Environm Intal Scisnlists 5020 County Road 154, Glenwood Springs, CO 81601 Phone: (970) 945-7988, Fax: (970) 945-8454 Email: ka9tenwood@kumarusa.com Earthwork Compaction Testing Report Client: Bob Gibson 3092 Walnut Place Grand Junction, Colorado 81504 Project No.: 19-7-337.A Day: Date: Page: Tuesday 10/15/19 1 of 1 Project: Proposed Residence, Lot FW -6, Aspen Glen, Golden Bear, Garfield County, Colorado Weather: Clear, calm, dry Temperature: 31° at 8:30 am Earthwork Contractor: JJJ Construction Equipment Used: Description of Earthwork Tested: Sample(s) Obtained: Verbal Communication: Trackhoe, vibratory double drum roller The contractor has begun under footing backfill operations and both tests met minimum project moisture -density requirement. Izzy with JJJ Construction was informed of our field test results Placement and Compaction Procedure: Reported by the Contractor. Lift Thickness: 1' Max. Rock Size: 1" Compactor(s) Used: vibratory double drum roller Moisture hydrant at stockpile Conditioning: Number of Passes: as required Nuclear Gauge Moisture/Density Test Results Test No. Location Depth or Eley. Field Dry Densit ensi y (pcf) Field Moisture Content Field Com (%)p' Min. Comp. Req. (%) Proctor Lab No. 1 N.W. corner 2' below footing grade 105.2 14.2 98 98 Est. 2 N.E. corner 2' below footing g rade 106.7 14.8 99 98 Est. Proctor Sample Reference: Lab No. Method Description Max. Dry Dens. (pcf) Opt. Moist. (%) Estimate ASTM D 698 Lean Clay (Lot 51 107.5 15.5 THIS REPORT PRESENTS OPINIONS AS A RESULT OF OUR OBSERVATIONSOF FILL PLACEMENT, WE HAVE RELIED ON THE CONTRACTOR TO CONTINUE APPLYING THE RECOMMENDED COMPACTIVE EFFORT AND MOISTURE TO FILL DURING THE TIMES WHEN OUR OBSERVER IS NOT OBSERVING OPERATIONS THE NUCLEAR DENSOMETER METHOD OF TESTING WAS USED IN SUBSTANTIAL ACCORDANCE WITH ASTM D 6938. Distribution: Bob Gibson i)ob',i btiik['. ::(3n1) /Imo Philip Orgill Steven L. Pawlak, P.E. Field Technician Reviewed By ! i I(...1 % ,..„ rah n, ,„Mateia s E." L�u1�.eitnirai slid Materials Engineers nvironTienr.::i F. Clentists 5020 County Road 154, Glenwood Springs, CO 81601 Phone: (970) 945-7988, Fax: (970) 945-8454 Email: kaaIenwood@kumarusa.com Earthwork Compaction Testing Report Client: Bob Gibson 3092 Walnut Place Grand Junction, Colorado 81504 Project No.: 19-7-337.A Day: Wednesday Date: 10/16/19 Page: 1 of 1 Project: Proposed Residence, Lot FW -6, Aspen Glen, Golden Bear, Garfield County, Colorado Weather: Cloudy, calm, dry Temperature: 35° at 9:00 am Earthwork Contractor: JJJ Construction Equipment Used: Trackhoe, vibratory double drum roller Description of Earthwork The contractor has completed under footing backfill operations and all tests Tested: met minimum project moisture -density requirement. Sample(s) Obtained: Verbal Communication: ins/ with JJJ Construction was informed of our field test results Placement and Compaction Procedure: Reported by the Contractor. Lift Thickness: 1' Compactor(s) Used: Max. Rock Size: 1" Moisture hydrant Conditioning: vibratory double drum roller Number of Passes: Nuclear Gauge Moisture/Density Test Results as required Test No. Location Depth or Elev. Field Dry Density (pcf) Field Moisture Content % Field Comp. (%) Min. Comp. Req.Lab (o/ ) Proctor No. 1 30' S. of N.E. corner Footing grade 108.3 14.8 100 98 Est. 2 Center pad footing Footing grade 107.2 14.3 100 98 Est. 3 S.E. corner Footing grade 108.5 15.2 100 98 Est. Proctor Sam le Reference: Lab No. Method Description Max. Dry Dens. (pcf) Opt. Moist. (%) Estimate ASTM D 698 Lean Clay (Lot 5) 107.5 15.5 THIS REPORT PRESENTS OPINIONS AS A RESULT OF OUR OBSERVATIONSOF FILL PLACEMENT, WE HAVE RELIED ON THE CONTRACTOR TO CONTINUE APPLYING THE RECOMMENDED COMPACTIVE EFFORT AND MOISTURE TO FILL DURING THE TIMES WHEN OUR OBSERVER IS NOT OBSERVING OPERATIONS. THE NUCLEAR DENSOMETER METHOD OF TESTING WAS USED IN SUBSTANTIAL ACCORDANCE WITH ASTM D 6938. Distribution: Bob Gibson (bob(a bufidwithrm.corn) /Imo Philip Orgill Steven L. Pawlak, P.E. Field Technician Reviewed By