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HomeMy WebLinkAboutObservation of Foundation Bearing Conditions 12.05.14·==--=n "' [~ !}-,. ~-- Ge~~U~<eCul '-'EP\\'ORTH-Pt\\VL!\!'~ G EOTECI IN IC 1\I December 5, 2014 DTDT, Inc. Attn: Ken Garrett 3800 South Wadsworth Blvd., Suite 465 Lakewood, Colorado 80235 k.l!n!.!,111w lll"-ll.~um " i Joh No. 114 0388 Subject: Observation of Foundation Bearing Conditions, Proposed Residence, Lot 48, Pinyon Mesa, Cliffrose Way and Pinyon Mesa Drive, Garfield County, Colorado Dear Mr. GatTett : As requested, a representative of Hepworth-Pawlak Geotechnical, Inc. observed the excavation and placement of backfill under footings at the subject site from November 19 to December I, 2014 to evaluate the soils for foundation support. The finding,5 of our observations and recommendations for the foundation design are presented in.this report. We previously conducted a subsoil study fo r design of foundations at the site and presented our findings in a report dated March 7, 2014, Job No. 114 111 A. The footing excavations were subexcavated 5 feet below footing grade (about 8 feet below the surrounding ground surface) and 5 feet of on-site soil was moistened and compacted back up to design footing grade as recommended in the subsoil study. The excavation subgrade was firm and not frozen prior to placement of structural fill . The on-site fill soils were moistened at the stockpile and were observed to be well mixed and not frozen when placed. Compaction testing was performed on the underfooting backfill as described in our daily reports between November 19 and December I, 2014. The density test results indicate that the structural fill was compacted to at least 98% of the maximum standard Proctor density at moisture contents near optimum. The soil conditions exposed in the excavation are consistent with those previously encountered on the site and the compacted structural fill is suitable for support of spread footings designed for the recommended allowable bearing pressure of 1,500 psf. Concrete should not be placed on frozen soils. Other recommendations presented in our previous report which are applicable should also be observed. The recommendations submitted in this letter are based on our observation o f the soils exposed within the foundation excavation the density test results and the previous limited subsurface exploration at the site. Variations in the subsurface conditions below the excavation could increase the risk of foundation movement. We should be advised of any DTDT, Inc. December 5, 2014 Page 2 variations encountered in the excavation conditions for possible changes to recommendations contained in this letter. Our services do not include detennining 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. Daniel E. Hardin, P.E. DEH/ksw Attachments : Job No. 114 0388 ~tech 5020 County Road 154 Glenwood Springs, Colorado 81601 Phone: 970-945-7988 Fax: 970-945-8454 HEPWORTH · PAWLAK GEOTECHNICAL llpgeo@hpgeotech.com Earthwork Compaction Testing Report Client: DTOT, Inc. Job No.: 114 0388 Day: Wednesday Attn: Ken Garrett Date: 11/19/14 3900 South Wadsworth Blvd, Suite 465 Page: 1 of 1 Lakewood, CO 80235 Project: Lot 48, Pinyon Mesa, Garfield County, Colorado Weather: Clear, calm, dry Temperature: 40° at 3:00 pm Earthwork Contractor: E & L Trucking Equipment Used: Trackhoe, Sheepsfoot Roller Description of Earthwork The first lift of fill material for under-footing backfill for the south wall of the Tested : resi dence was tested. A site specific proctor value for this lot has not yet been determined for today's testing. Tests were taken in materials prepared to several moisture content levels to determine where best compaction was being achieved. Visual cues of appropriate compaction including the sheepsfoot compactor 'walking out' of the soil indicated appropriate compaction effort and moisture conditioning. When laboratory Proctor value was obtained, the test results (below) indicated satisfactory compaction had been achieved. Verbal Communication: Luis Muriello - E & L Trucking Placement and Compaction Procedure: Observed by HP Geotech. Lift Thickness: 8" Max. Rock Size: Moisture Hose at Stockpile Conditioning: Compactor(s) Used: Sheepsfoot Roller Number of Passes: 10+ Nuclear Gauge Moisture/Density Test Results Location Field Dry Field Field Min. Test Depth or Moisture Comp. Proctor No. Elev. Density Content Comp. Req . Lab No. (pcf) % (%) (%) 1 South Wall, 20' East of SW corner -7.5' from 106.3 13 .0 100 98 236-14 ground 2 South Wall, 15' East of SW corner -7.5' from 107.9 13 .1 100 98 236-14 ground 3 South Wall, 10' East of SW corner -7.5' from 107.5 12 .8 100 98 236-14 ground Proctor Sample Reference: Lab No. Method Description Max. Dry Opt. Dens.(%) Moist.(%) 236-14 ASTM 0698 Slightly Sandy Silt 105.8 15.5 THI S REPORT PRESENTS OPINIONS AS A RESULT OF OUR OBSERVATIONSOF FILL PLACEMENT. WE HAVE RELIED ON THE CONTRACTOR TO CONTINUE APPLYING T HE RECOMMENDED COMPACTIVE EFFORT AND MOISTURE TO FILL DURING THE TIMES WHEN OUR OBSERVER IS llOT OBSERVING OPERATION S THE NUCLEAR DENSOMETER METHOD OF TESTING WAS USED IN SUBSTANTIAL AC CORDANCE WITH ASTM 0 6918 Distribution: DTDT, Inc. -Ken Garrett (kengarr@msn.com) Tom Brunner Daniel E. Hardint P.E. Field Technician Re v iewed By G~tech 5020 County Road 154 Glenwood Springs, Colorado 81601 Phone: 970-945-7988 Fax: 970-945·8454 HEPWORTH ·PAWLAK GEOTECHNICAL hpgeo1Vhpgeotech.r.olT! Earthwork Compaction Testing Report Client: OTOT, Inc. Job No .: 114 0388 Day : Thursday Attn : Ken Garrett Date: 11/20/14 3900 South Wadsworth Blvd Page : 1 of 1 Suite 465 Lakewood, CO 80235 Project: Lot 48 Pinyon Mesa, Garfield County, Colorado Weather: Partly cloudy, calm, dry Temperature: 40° at 12:00 pm Earthwork Contractor: E & L Trucking Equipment Used: Trackhoe, Sheepsfoot Roller Description of Earthwork The under-footing fill material for the south wall of the residence was tested. Tested : The excavation area was not covered with insulation blankets overnight Due to the temperature of material in the stockpile and the ground surface temperture, no material was placed until 11 :00 am. Compaction and moisture values were in compliance with the recommendations in the soils report. Sample(s) Obtained: Verbal Communication : Raphael ~ E&L Trucking Ken Garrett was informed of our results via ~hone Placement and Compaction Procedure: Observed by HP Geotech. Lift Thickness: 8-12" Max. Rock Size : Moisture Hose at Stockpile Conditioning: Compactor(s) Used: Sheepsfoot Roller Number of Passes: Nuclear Gauge Moisture/Density Test Results Location Field Dry Field Field Min . Test Depth or Moisture Comp. Proctor No . Elev. Density Content Comp. Req . Lab No. (pcf) % (%) (%) 1 South Wall, 20' West of SE corner .7• from 106.3 17.1 100 98 236-14 ground 2 South Wall, 20' East of SW corner ·1' from 103.9 19.1 98 98 236·14 ground 3 Center of South Wall -6' from 107.3 16.4 100 98 236·14 ground 4 South Wall, 10' East of SW corner -6' from 107.8 13.0 100 98 236-14 ground 5 East Wall, 5' North of SE corner -7' from 104.1 13.9 98 98 236·14 ground Proctor Sample Reference: Lab No . Method Description Max. Dry Opt. Dens .(%) Moist. (%) 236·14 ASTM D 698 Slli:1htlv Sandv Silt 105.8 15.5 THIS REPORT PRESENTS OPINIONS AS A RESULT OF OUR OBSERVATION SOF FILL PLACEMENT WE HAVE RELIED ON THE COt.ITRACTOR TO CONTINUE APPLY ING Thf RECOMMEN OCO COMPACTIVE EFFORT ANO MOISTURE TO FILL DURING THE TIMES WHEN OUR OBSERVER IS HOT OBSERVING OPERATIO NS THE tlUCLEAA OWSOM ETER METHOD OF TEST ING WPS USED lN SUBSTANTIAL ACCORDANCE Willi ASlM 0 6938 Distribution : DTDT, Inc. -Ken Garrett (kengarr@msn.com) Tom Brunner Daniel E. Hardin, P.E. Field Technician Reviewed By . ~tech 5020 County Road 154 Glenwood Springs, Colorado 81601 Phone: 970-945-7988 Fax: 970-945-8454 HEPWORTH-PAWLAK GEOTECHNICAL hpoeol@hpgeotech com Earthwork Compaction Testing Report Client: DTOT, Inc. Job No.: 114 0388 Day: Friday Attn: Ken Garrett Date: 11/21/14 3900 South Wadsworth Blvd Page: 1 of 1 Suite 465 Lakewood, CO 80235 Project: Lot 48 Pinyon Mesa, Garfield County, Colorado Weather: Partly cloudy, calm, dry Temperature: 31° at 9:20 am Earthwork Contractor: E & L Trucking Equipment Used: Trackhoe, Sheepsfoot Roller Description of Earthwork The under-footing fill material for the south wall of the residence was tested. Tested: The excavation area covered with insulation blankets overnight At the time of our site visit the stockpile temperature was 36-40°F and the ground temperature was 28-30°F. The contraction was starting to process material from the stockpile while waiting for the ground temperature to be suitable for placement of fill. Compaction testing was completed during afternoon visit to the site. Compaction and moisture values were in compliance with the recommendations in the soils report. Verbal Communication: Luis -E&L Trucking Ken Garrett was informed of our results via ehone. Placement and Compaction Procedure: Observed by HP Geotech. Lift Thickness: 8-12" Max. Rock Size: Moisture Hose at Stockpile Conditioning: Compactor(s) Used: Sheepsfoot Roller Number of Passes: Nuclear Gauge Moisture/Density Test Results Location Field Dry Field Field Min . Test Depth or Moisture Comp. Proctor No. Elev. Density Content Comp. Req. Lab No. (pcf} % (%) (%) 1 South Wall, 1 Oft West of SE corner -5' from 110.9 14.7 100 98 236-14 ground 2 South Wall, 15ft East of SW corner -4' from 106.5 16.5 100 98 236-14 ground Proctor Sample Reference: Lab No. Method Description Max. Dry Opt. Dens.(%) Moist.(%) 236-14 ASTM 0 698 Slightly Sandy Silt 105.8 15.5 TH IS REPORT PRESENTS OPINIONS AS A RESULT OF OUR OOSERVATIONSOF Fill Pl.ACEMEtll. WE liAVE RELIED ON THE CONTRACTOR TO CONTINUE APPLYING THE RECOMMENDED COMPACTIVE EFFORT ANO MOISTURE TO FILL DURING THE TIMES WHEN OUR OBSERVER IS NOT OBSERVING OPERATIONS THE NUCLEAR OENSOMETCR METHOD OF TESTING WAS USED IN SUBSTANTIAL ACCORDANCE WITH ASTh1O6938 . Distribution: DTDT, Inc. -Ken Garrett (kengarr@msn .com) Tom Brunner Daniel E. Hardin, P.E. Field Technician Reviewed By GAS'£tech 5020 County Road 154 Glenwood Springs, Colorado 81601 Phone ; 970-945·7988 Fax: 970 -945-8454 HEPWORTH-PAWLAK GEOTECHNICAL hpgeor@hpgeotech.com Earthwork Compaction Testing Report Client: DTDT, Inc. Job No.: 114 0388 Day : Monday Attn : Ken Garrett Date: 11/24/14 3900 South Wadsworth Blvd Page: 1 of 1 Su i te 465 Lakewood, CO 80235 Project: Lot 48 Pinyon Mesa, Garfield County, Colorado Weather : Overcast, calm, light snow Temperature: 25° at 10:00 am Earthwork Contractor: E & L Trucking Equipment Used: Trackhoe, Sheepsfoot Roller Description of Earthwork The under-footing fill material for the west wall of the residence was tested. Tested : Ground temperature below construction insulation blankets was 35°F. Contractor excavated material from the west wall of the residence for immediate processing and replacement. Due to existing ground contours and foundation design, the footing elevation along the western wall of the residence is less than 3 feet below the existing ground elevation. All elevations are referenced to the existing ground surface. Compaction and moisture values were in compliance with the recommendations in the soils report. Verbal Communication: Luis -E&L Trucking Placement and Compaction Procedure: Observed by HP Geotech. Lift Thickness : 8-12" Max. Rock Size : Moisture Hose at Stockpile Conditioning : Compactor(s) Used: Sheepsfoot Roller Number of Passes: Nuclear Gauge Moisture/Density Test Results Location Field Dry Field Field Min. Test Depth or Moisture Comp. Proctor No. Elev. Density Content Comp. Req . Lab No . (pcf) % (%) (%) 1 West Wall, 20' North of SW corner -6' from 104.4 16.7 98 98 236-14 ground 2 West Wall, 5' South of NW corner -3' from 105.7 16.5 100 98 236-14 ground 3 West Wall, 30' North of SW corner -2' from 105.5 16.7 100 98 236-14 ground Proctor Sample Reference: Lab No . Method Description Max . Dry Opt. Dens.(%) Moist.(%) 236-14 ASTM 0 698 Sliqhtly Sandy Slit 105.8 15.5 nus REPORT PRESENTS OPINIONS AS A RESUlT OF OUR OSSERVATIONSOF Fill PLACEMENT we HAVE RELIED ON THE CONTRACTOR TO CONTINUE APPl VING THE RECOMMENDED COMPACTIVE EFFORT ANO MOISTURE TO FILL DURING THE TIMES WHEN OUR OBSERVER rs NOT OBSERVING OPERATIONS THE NUCLEAR DENSOMETER METHOD OF TESTING WAS USED IN SUBSTANTIAL ACCORDANCE WITH ASlM D6938 Distribution: DTDT, Inc. -Ken Garrett (kengarr@msn.com) Tom Brunner Daniel E. Hardin, P .E. Field Technician Reviewed By G6'£tech 5020 County Road 154 Glenwood Springs, Colorado 81601 Phone: 970·945-7988 Fax: 970-945-8454 HEPWORTH· PAWLAK GEOTECHNICAL hogeo®hpgeotech.com Earthwork Compaction Testing Report Client: OTOT, Inc. Job No.: 114 0388 Day : Tuesday Attn : Ken Garrett Date: 11/25/14 3900 South Wadsworth Blvd, Suite 465 Page: 1 of 1 Lakewood, CO 80235 Project: Lot 48, Pinyon Mesa, Garfield County, Colorado Weather: Overcast, calm, light snow Temperature: 30°at12:00 pm Earthwork Contractor: E & L Trucking Equipment Used: Trackhoe, Sheepsfoot Roller Description of Earthwork Fill was being placed for a midline footing. Due to weather the contractor Tested : anticipates only 2 lifts being placed today. Remaining earthwork may be completed during the forcasted warmer temperatures later this week. All elevations are referenced to the existing ground surface. Compaction and moisture values were in compliance with the recommendations in the soils report. Sample(s) Obtained : Verbal Communication: Luis - E & L Trucking Placement and Compaction Procedure: Observed by HP Geotech. Lift Thickness: 6-8" Max. Rock Size: Moisture Hose at Stockpile Conditioning: Compactor(s) Used : Sheepsfoot Roller Number of Passes: Nuclear Gauae Moisture/Oensiti· Test Results Location Field Dry Field Field Min . Test Depth or Moisture Comp . Proctor No. Elev. Density Content Comp. Req. Lab No. (pcf) % (%) (%) 1 Midline footing, 15' North of South -6' from 107.1 15.8 100 98 236-14 Wall around Proctor Sample Reference: Lab No. Method Description Max. Dry Opt. Dens.(%) Moist.(%) 236-14 ASTMD698 Sliahtlv Sandv Silt 105.8 15.5 TI11S REPORT PRESENTS OPINIONS AS A RESULT OF OUR OBSERVATIONSOF FILL PLACEMENT WE HAVE RELIED ON THE CONTRACTOR TO CONT NUE APPL Y•NG THt: REOOMMENOEO COMPACTIVE EFFORT ANO MOISTURE TO FILL DURING THE TIMES WHEN OUR OBSERVER IS NOT OBSERVING OPERATIONS THE NUCLEAR OENSOMETER METHOD OF TESTING WAS USED IN SUBSTANTIAL ACCORDANCE WITH ASm 0 6938 Distribution: OTOT, Inc. -Ken Garrett (kengarr@msn.com) Tom Brunner Daniel E. Hardin, P.E. Field Technician Reviewed By ~£tech 5020 County Road 154 . . Glenwood Springs, Colorado 81601 Phone: 970.945-7988 Fax: 970·945-8464 HEPWORTH· PAWLAK GEOTECHNICAL .. f!pgeo@hpqeolech.com Earthwork Compaction Testing Report Client: DTDT, Inc. Job No.: 114 0388 Day: Wednesday Attn: Ken Garrett Date: 11/26/14 3900 South Wadsworth Blvd, Suite 465 Page: 1 of 1 Lakewood, CO 80235 Project: Lot 48, Pinyon Mesa, Garfield County, Colorado Weather: Cloudy, calm, dry Temperature: 34° at 9:30 am, 45° at 4:00 pm Earthwork Contractor: E & L Trucking Equipment Used: Track hoe, vibratory pad foot roller Description of Earthwork Backfill placement and compaction continued under footing areas. Two site Tested: visits were made today for compaction testing. Tests indicated acceptable compaction was being obtained at moisture contents close to optimum. Verbal Communication: Luis with E & L Trucking was informed of our test results. Placement and Compaction Procedure: Not observed by HP Geotech. Lift Thickness: Max. Rock Size: Moisture Garden hose & track hoe Conditioning: blending In stockpile Compactor(s) Used: Number of Passes: Nuclear Gauge Moisture/Density Test Results Location Field Dry Field Field Min. Test Depth or Moisture Comp. Proctor No. Elev. Density Content Comp. Req. Lab No. Backfill below footings (pcf) % (%) (%) 1 Middle of center footJng llne 2' below 103.3 15.5 98 98 236-14 footing grade 2 25' s of NW building comer 2'below 104.7 15.3 99 98 236-14 footing grade 3 10' S of NW building comer Footing grade 107.8 14.6 102 98 236-14 4 20' S of NE buUdlng comer Footing grade 104.8 14.1 99 98 236-14 5 5' N of SE building corner Footing grade 109.2 16.2 103 98 238-14 Proctor Sample Reference: Lab No. Method Description Max. Ory Opt. Dens.(%) Moist.(%} 236-14 ASTM 0698 Slightly Sandy Silt 105.8 15.5 TiflSREPORT PRES!NTSO?INlONSASA RESULT OF OUROBSERVATIONSOF FIU~MENT, nc HAVI: RELIED OH THE--· .. ·---R TO CC NTINVeAPPLYIHG THE R!COMMENOEO COMPACTIVE EFFORT ANO MOISTURE TO Fll.l DURING ntE TNES WHEN OUR 08SERvER IS NOT OBSERVING OPERATIONS. TllE NUCLEAR D!NSOMETER METHOD OF T!STING WAS USED JN SUBSTANTIAL ACCORDANCE WITH ASTM D 693a Distribution: DTOT, Inc. -Ken Garrett (kengarr@msn.com) TJW/ Tom Westhoff Daniel E. Hardin, P .E. Field Technician Reviewed By ~tech 5020 County Road 154 Glenwood Springs, Colorado 81601 Phone: 970-945-7988 Fax: 970-945-8454 HEPWORTH · PAWLAK GEOTEC HN lCAL t.P.oeo®hpgeotech com Earthwork Compaction Testing Report Client: DTDT, Inc. Job No.: 114 0388 Day: Monday Attn: Ken Garrett Date: 12/1/14 3900 South Wadsworth Blvd, Suite 465 Page: 1 of 1 Lakewood, CO 80235 Project: Lot 48, Pinyon Mesa, Garfield County, Colorado Weather: Clear, calm, dry Temperature: 45°at10:00 am Earthwork Contractor: E & L Trucking Equipment Used: Trackhoe Description of Earthwork Fine grading to complete final footing grade elevations were being completed. Tested : Testing was performed at final footing grade elevations. Compaction and moisture values were in compliance with the recommendations in the soils report. Sample(s) Obtained: Verbal Communication: Luis with E&L Trucking was informed of our results Placement and Compaction Procedure: Reported by the Contractor. Lift Thickness: Max. Rock Size: Moisture Conditioning : Compactor(s) Used: Number of Passes: Nuclear Gauge Moisture/Density Test Results location Field Dry Field Field Min. Test Depth or Moisture Comp. Proctor No . Elev. Density Content Comp. Req. Lab No. (pcf) % (%) (%) 1 20' E of NW building corner Footing 105.2 16 99.5 98 236-14 grade 2 30' N of SW building corner Footing 104.9 16 99.1 98 236-14 grade 3 20' N of SE building corner Footing 113.5 14 100+ 98 236-14 grade Proctor Samole Reference: Lab No. Method Description Max. Dry Opt. Dens.(%} Moist.(%) 236-14 ASTM D 698 Slightly Sandy Slit 105.8 15.5 IBIS REPORT PRESENT S OPINIONS AS A RESULT OF OUR OBSERVAllONSOF FILL PLACEMEtlT WE HAVE RELIED ON THE CONTRACTOR TO CONTINUE APPLYING THE RECOMMENDED COMPACTIVE EFFORT ANO MOISTURE TO FILL DURING TliE TIMES WHEN OUR OBSERVER IS NOT OBSERVlNG OPERATION S. THE NUCLEAR DENSOMETER METHOD OF TESTING WAS USED IN SUBSTANTIAL ACCORDANCE Willi ASTM D 6938. Distribution : OTDT, Inc. -Ken Garrett (keogarr@msn.c om ) Tom Brunner Daniel E. Hardin, P.E. Field Technician Reviewed By /ksw