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Report (19) nr5i toct- X 10 EOCONSULTANTS l 30s-E% 16I4 k ate l/14 u7S}- TECHNICAL MEMORANDUM PDATE: March 16, 2016 "`�5 �' N/ f�® TO: Reed Couch - D R Horton `449 "' 'E Don Durst - D R Horton J • `EGi•,; FROM: Brad L. Hupy, PE, GE- Principal Engineer IttePP 4 RE: Summit Ridge Subdivision 'AD 4 Lot 159 Remediation I Exp une 30, t1'r y Fill placed in Lot 1 59 at Summit Ridge during land development was found to be soft and unsuitable for supporting the planned building during our site visit on February 26, 2016. We recommended removal of the soft fill and made eight additional visits to Lot 1 59, the final visit was on March 8. We assisted with identifying the limits of the fill to be removed and with placement and compaction of crushed rock to replace the soft fill. In our opinion the removal and replacement of soft fill with crushed rock has been completed, allowing the forming and placement of foundations to go forward as planned on March 17. The fill will support footing loads as intended. The foundation plan for the home on Lot 159 includes an interior continuous footing that supports a bearing wall. There are no other interior continuous footings. During excavation and backfill, the downslope cut of the soil bench supporting the footing was cut too close to the footing line. The edge of the cut is about 1 foot from the edge of the footing and is nearly vertical along a portion of the footing alignment. The cut could endanger long term support of the footing. We recommend that following forms removal, the flat bench supporting the interior footing be extended to a minimum width of 2 feet from edge of footing. The extended area should be constructed as a "sliver-fill" using 3/4-inch minus crushed rock that is compacted to at least 90% of the maximum density as determined by ASTM Dl 557. The slope below the flat bench should be no steeper than 1 H:1 V (45 deg), extending to where it "catches" the lower flat bench of the exterior footing line. Attachments: Daily Field Reports 1 - 9 824 SE 12th Avenue, Portland, OR 97214 • 503-616-9425 • gcnweb.com 1 824 SE 12th Avenue Portland,Oregon 97214 FIELD OBSERVATION REPORT C� Consultants Tel(503)616-9425 Northwest Inc. www.gcnweb.com PROIECT ID DATE REPORT NO. Summit Ridge February 26, 2016 1 OWNER/CLIENT OWNER/CLIENT REPRESENTATIVE DAY OF WEEK PAGE D R Horton (DHI) Reed Couch Friday 1 of 1 GENERAL CONTRACTOR GENERAL CONTRACTOR REPRESENTATIVE ARRIVAL TIME DEPARTURE TIME DHI Don Durst 1 100 1200 GRADING CONTRACTOR GRADING CONTRACTOR REPRESENTATIVE WEATHER/TEMPERATURE PERMIT O'Rear Excavating and Construction Chris O'Rear/John Kangus Cloudy/58° F TYPE OF WORK SOURCE AND DESCRIPTION OF FILL MATERIAL GCN REPRESENTATIVE Foundation Excavation NA Paul A. Crenna, CEG LOCATION OF WORK CONTRACTORS EQUIPMENT OBSERVED IN USE Lot 1 59 (PH 5 Lot 24) Tracked Excavator, Dump truck CONTRACTOR ACTIVITY,OBSERVATIONS,CONCLUSIONS,RECOMMENDATIONS I made this visit at the request of Don Durst to observe foundation excavation subgrade conditions for single-family home construction on Lot 1 59. While on site, I met with Mr. Durst, Mr. O'Rear and Mr. Kangus. At the time of my visit, the contractor had just begun the foundation excavation at the front of the building envelope. The building envelope was partially marked with offset survey stakes. Mr. O'Rear and Mr. Kangus stated that the existing lot fill was soft at the planned footing elevations provided by DHI. I observed the subgrade and probed the near surface soil with a steel shaft soil probe. The fill within about 4 feet of the pre-excavation ground surface was soft silt with some (about 15%to 35%)gravel to cobble-sized, angular fragments of basalt. On the northwest corner of the building envelope, the fill became stiff at a depth of about 4 feet below pre-existing grade. I recommended that the soft fill be removed from footing areas. Imported granular backfill may be necessary to reconstruct the subgrade to re-establish planned footing elevations. Alternatively, the planned depth of footings may be deepened to reach subgrade that is suitable for bearing support. A Preliminary report is provided solely as evidence that the field observation was performed. Observations,and/or conclusions,and/or recommendations FINAL PREUMINARY conveyed In the final report may vary from and shall take precedence over those indicated in a preliminary report. A final report is an instrument of professional service.My conclusions drawn from this report should be discussed with and evaluated by the professional involved. ITEMS TO OBSERVE,CHECK,OR TEST DURING NEXT VISIT FIELD REPRESENTATIVE SIGNATURE DATE / February 26, 2016 GCN's professionals are represented on site solely to observe operations of the contractor identified,to form opinions about the adequacy of those operations,and to report those opinions to our dient. The presence and activities of our field representative do not relieve any contractor from its obligation to meet contractual requirements.We rely on the contractor to comply with the plans and soedfications throughout the duration of the nroiect.irrespective of the oresence of our representative.The contractor retains sole responsibility for site safety and the methods.operations,and sequences. 824 Portland,12th Avenue e214 GEC} Consultants Tel land,OreOregon on 9 FIELD OBSERVATION REPORT www.gcnweb.com Northwest, Inc. PROIECT ID DATE REPORT NO. Summit Ridge February 29, 2016 2 OWNER/CLIENT OWNER/CLIENT REPRESENTATIVE DAY OF WEEK PAGE D R Horton (DHI) Reed Couch Monday 1 of 1 GENERAL CONTRACTOR GENERAL CONTRACTOR REPRESENTATIVE ARRIVAL TIME DEPARTURE TIME DHI Don Durst 1615 1 700 GRADING CONTRACTOR ° GRADING CONTRACTOR REPRESENTATIVE WEATHER/TEMPERATURE PERMIT O'Rear Excavating and Construction Chris O'Rear/John Kangus Cloudy/56° F TYPE OF WORK SOURCE AND DESCRIPTION OF FILL MATERIAL GCN REPRESENTATIVE Foundation Excavation NA Paul A. Crenna, CEG LOCATION OF WORK CONTRACTORS EQUIPMENT OBSERVED IN USE Lot 1 59 (PH 5 Lot 24) Tracked Excavator, Dump truck CONTRACTOR ACTIVITY,OBSERVATIONS,CONCLUSIONS,RECOMMENDATIONS: I made this visit at the request of Don Durst to observe foundation excavation subgrade conditions for single-family home construction on Lot 1 59. While on site, I met with Mr. O'Rear and Mr. Kangus. At the time of my visit, the contractor had completed a portion of the excavation on the front of the building envelope. Mr. O'Rear and Mr. Kangus stated that soft fill in the PUE was hindering excavation and that the trackhoe had sunk up to the cab. I observed the subgrade on the front portion of the building envelope and probed the near surface soil with a steel shaft soil probe. The northwest corner of the excavation was stiff fill, but the front-middle and northeast corner was soft. I recommended that the soft fill be removed. I remained on site and observed the removal of soft fill from the front-middle and northwest corner of the building envelope to an approximate depth of 3 to 4 feet below the planned footing elevations. At this elevation, the subgrade is generally stiff fill, but includes isolated medium-stiff and soft pockets. The subgrade along the front of the building envelope is considered adequate for footing support provided that it is capped with a minimum 1-to 2-foot-thick layer of compacted crushed rock such as 3/4"-0. I recommended that the subgrade be covered with compacted crushed rock immediately in order to protect it from softening due to exposure and disturbance by heavy equipment. GCN should be contacted to observe the remaining portion of the foundation excavation, and test compaction of crushed rock backfill. A Preliminary report is provided solely as evidence that the field observation was performed. Observations,and/or conclusions,and/or recommendations ❑ FINAL ® PRELIMINARY conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. A final report is an instrument of professional service. Any condusions drawn from this report should be discussed with and evaluated by the professional involved. ITEMS TO OBSERVE,CHECK,OR TEST DURING NEXT VISIT FIELD REPRESENTATIVE SIGNATURE DATE February 29, 2016 GCN's professionals are represented on site solely to observe operations of the contractor identified,to form opinions about the adequacy of those operations,and to report those opinions to our dient. The presence and activities of our field representative do not relieve any contractor from its obligation to meet contractual requirements.We rely on the contractor to comply with the plans and soedfications throughout the duration of the oroiect.irrespective of the presence of our representative. The contractor retains sole responsibility for site safety and the methods.operations.and sequences. 824 SE 12th Avenue Portland,Oregon 97214 FIELD OBSERVATION REPORT GEO Consultants Tel(503)616-9425 Northwest Inc. www.gcnweb.com PROJECT ID DATE REPORT NO. Summit Ridge March 2, 2016 3 OWNER/CUENT OWNER/CUENT REPRESENTATIVE DAY OF WEEK PAGE D R Horton (DHI) Reed Couch Wednesday 1 of 1 GENERAL CONTRACTOR °GENERAL CONTRACTOR REPRESENTATIVE ARRIVAL TIME DEPARTURE TIME DHI Reed Couch/Don Durst 1000 1 100 GRADING CONTRACTOR ° GRADING CONTRACTOR REPRESENTATIVE WEATHER/TEMPERATURE PERMIT O'Rear Excavating and Construction Chris O'Rear/John Kangus Showers/56° F TYPE OF WORK SOURCE AND DESCRIPTION OF FILL MATERIAL GCN REPRESENTATIVE Foundation Excavation NA Paul A. Crenna, CEG LOCATION OF WORK CONTRACTORS EQUIPMENT OBSERVED IN USE Lot 1 59 (PH 5 Lot 24) Tracked Excavator, Dump truck CONTRACTOR ACTIVITY,OBSERVATIONS,CONCLUSIONS,RECOMMENDATIONS: I made this visit at the request of Don Durst and Reed Couch to observe foundation excavation subgrade conditions for single-family home construction on Lot 1 59. While on site, I met with Mr. Couch, Mr. Durst, Mr. O'Rear and Mr. Kangus. At the time of my visit, the contractor had completed a second bench on the middle-portion of the building envelope. I observed the subgrade on the front portion of the building envelope and probed the near surface soil with a steel shaft soil probe. The subgrade beneath this second bench was soft to a depth of about 1 foot on the west and more than 4 feet on the east. A 5-foot-high vertical cut face between the two benches was sloughing and caving with debris accumulated at the base. I observed the excavation of three test pits in the building envelope and encountered the following: On the middle eastern perimeter: 6 feet of soft fill overlying very-stiff, rocky silt. On the southwest corner: 1 foot of soft silt overlying very-stiff native silt. On the southern-middle: 1-1/2 feet of soft fill overlying stiff fill. I recommended that the soft fill be removed and replaced with imported crushed rock compacted to at least 90%of the maximum dry density obtained by ASTM D1557 or equivalent. Placement of a minimum 1 foot thickness of compacted crushed rock is recommended to protect the near surface subgrade from softening due to exposure and heavy equipment. Thicker crushed rock backfill may be necessary in some areas. GCN should be contacted to observe the subgrade prior to placement of granular backfill and test compaction of backfill. A Preliminary report is provided solely as evidence that the field observation was performed. Observations,and/or conclusions,and/or recommendations ElFINAL ® PRELIMINARY conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. A final report is an instrument of professional service. My conclusions drawn from this report should be discussed with and evaluated by the professional involved. ITEMS TO OBSERVE,CHECK,OR TEST DURING NEXT VISIT FIELD REPRESENTATIVE SIGNATURE DATE . L':41 > March 2, 2016 GCN's professionals are represented on site solely to observe operations of the contractor identified,to form opinions about the adequacy of those operations,and to report those opinions to our client. The presence and activities of our field representative do not relieve any contractor from its obligation to meet contractual requirements.We rely on the contractor to comply with the plans and specifications throughout the duration of the proiect irrespective of the presence of our representative.The contractor retains sole responsibility for site safety and the methods.operations.and sequences. 824 SE 12th Avenue Portland,Oregon 97214 FIELD OBSERVATION REPORT SEC} Canultats Tel(503)616-9425 Northwest, Inc. www.gcnweb.com PROJECT ID DATE REPORT NO. Summit Ridge March 2, 2016 4 OWNER/CLIENT OWNER/CLIENT REPRESENTATIVE DAY OF WEEK PAGE D R Horton (DHI) Reed Couch Wednesday 1 of 1 GENERAL CONTRACTOR GENERAL CONTRACTOR REPRESENTATIVE ARRIVAL TIME DEPARTURE TIME DHI Reed Couch/Don Durst 1500 1700 GRADING CONTRACTOR GRADING CONTRACTOR REPRESENTATIVE WEATHER/TEMPERATURE PERMIT O'Rear Excavating and Construction Chris O'Rear/John Kangus Showers/56° F TYPE OF WORK SOURCE AND DESCRIPTION OF FILL MATERIAL GCN REPRESENTATIVE Foundation Excavation NA Paul A. Crenna, CEG LOCATION OF WORK CONTRACTORS EQUIPMENT OBSERVED IN USE Lot 1 59 (PH 5 Lot 24) Tracked Excavator, Dump truck CONTRACTOR ACTIVITY,OBSERVATIONS,CONCLUSIONS,RECOMMENDATIONS I made this visit at the request of Reed Couch to attend site meeting with representatives of GeoPacific Engineering, Northwest Earth Movers (NEI), Venture Properties,O'Rear Excavating and DR Horton. Attendees Included Jeff Hargens, Jim Imbrie, Scott Neucom, Kevin Helton, Reed Couch, Chris O'Rear and others. The group discussed the site conditions and construction activities. I stated that I observed soft fill conditions beneath the building envelope extending to depths of 4 to 8 feet below finish grade. The group observed the excavation of two test pits. The test pit on the eastern edge of the building envelope encountered soft to medium-stiff fill to a depth of about 5 feet. Mr. Hargens stated the fill had been damaged by O'Rear's equipment traffic and that groundwater flow in the native soil beneath the fill and was softening the fill. I inquired if a subdrain had been installed beneath the fill and was told that no subdrain was installed. The second test pit on the western edge of the lot encountered stiff fill at a depth of about 2 to 3 feet below finish grade. Mr. Hargens proposed that NEI would provide the crushed rock for the fill repair, if DR Horton provided the labor. Mr. Helton and Mr, Couch agreed that that would be acceptable. Mr. Imbrie stated that he thought the soft fill conditions deeper than 4 feet below finish grade would be limited to Lot 159 and Lot 158. A Preliminary report is provided solely as evidence that the field observation was performed. Observations,and/or conclusions,and/or recommendations ❑ FINAL PRELIMINARY conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. A final report is an instrument of professional service. Any conclusions drawn from this report should be discussed with and evaluated by the professional involved. ITEMS TO OBSERVE,CHECK,OR TEST DURING NEXT VISIT FIELD REPRESENTATIVE SIGNATURE DATE March 2, 2016 GCN's professionals are represented on site solely to observe operations of the contractor identified,to form opinions about the adequacy of those operations,and to report those opinions to our client. The presence and activities of our field representative do not relieve any contractor from its obligation to meet contractual requirements.We rely on the contractor to comply with the plans and specifications throughout the duration of the project irrespective of the presence of our representative.The contractor retains sole responsibility for site safety and the methods.operations.and sequences. 824 SE 12th Avenue Portland,Oregon 97214 FIELD OBSERVATION REPORT GO Consultants Tel(503)616-9425 www.gcnweb.com Northwest, Inc. PROJECT ID DATE REPORT NO. Summit Ridge March 3, 2016 5 OWNER/CUENT OWNER/CLIENT REPRESENTATIVE DAY OF WEEK PAGE D R Horton (DHI) Reed Couch Thursday 1 of 1 GENERAL CONTRACTOR GENERAL CONTRACTOR REPRESENTATIVE ARRIVAL TIME DEPARTURE TIME DHI Reed Couch/Don Durst 1000 1200 GRADING CONTRACTOR GRADING CONTRACTOR REPRESENTATIVE WEATHER/TEMPERATURE PERMIT O'Rear Excavating and Construction Chris O'Rear/John Kangus Showers/54° F TYPE OF WORK SOURCE AND DESCRIPTION OF FILL MATERIAL GCN REPRESENTATIVE Foundation Excavation Knife River-Coffey Lake 3/"-0 Paul A. Crenna, CEG LOCATION OF WORK CONTRACTORS EQUIPMENT OBSERVED IN USE Lot 1 59 (PH 5 Lot 24) Tracked Excavator, Dump trucks CONTRACTOR ACTIVITY,OBSERVATIONS,CONCLUSIONS,RECOMMENDATIONS: I made this visit at the request of Reed Couch to observe the removal of soft fill from the building envelope on Lot 159. Upon my arrival, Mr. Kangus showed me that the approximate 5-foot-high, vertical cut slope on the northwest quadrant of the building envelope had caved back a few feet overnight. Northwest Earthmovers Inc. was delivering 3/"- 0 crushed rock to the site. I remained on site and evaluated fill strength with a steel rod soil probe as the excavation progressed. Mr.Jeff Hargens of NEI briefly visited the site and observed the excavation progress. I observed the excavating contractor remove soft rocky silt fill from the western two-thirds of the middle portion of the building envelope to approximate depths of 5 to 8 feet below pre-existing finish grade. The upper bench where the caving occurred overnight was cut down about 2 foot deeper. The vertical cut bank between the upper and middle portion of the building envelope was holding a vertical face. The vertical face exposed rocky silt fill that was generally medium-stiff to stiff with isolated soft pockets. The subgrade on the benched excavation on the middle portion of the building envelope was stiff to very-stiff fill that was suitable for placement of structural backfill. I observed the excavating contractor begin placing 3/4"-0 crushed rock on the approved subgrade. Mr. Kangus stated that he would have the remaining soft fill removed, the subgrade ready for observation and would be ready for a density test visit tomorrow morning. I contacted GCN senior field technician, Bob Pendell, and scheduled him for a density test visit to the site. A Preliminary report is provided solely as evidence that the field observation was performed. Observations,and/or conclusions,and/or recommendations pFINAL ® PRELIMINARY conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. A final report is an instrument of professional service. Any conclusions drawn from this report should be discussed with and evaluated by the professional involved. ITEMS TO OBSERVE,CHECK,OR TEST DURING NEXT VISIT FIELD REPRESENTATIVE SIGNATURE DATE 7::LeMarch 3, 2016 GCN's professionals are represented on site solely to observe operations of the contractor identified,to form opinions about the adequacy of those operations,and to report those opinions to our client. The presence and activities of our field representative do not relieve any contractor from its obligation to meet contractual requirements.We rely on the contractor to comply with the plans and soetifications throughout the duration of the oroiect.irrespective of the presence of our representative.The contractor retains sole responsibility for site safety and the methods.operations,and sequences. 824 SE 12th Avenue Portland,Oregon 97214 FIELD OBSERVATION REPORT GEO Consultants Tel(503)616-9425 www.gcnweb.com Northwest, Inc. PROJECT ID DATE REPORT NO. Summit Ridge March 4, 2016 6 OWNER/CLIENT OWNER/CUENT REPRESENTATIVE DAY OF WEEK PAGE D R Horton (DHI) Reed Couch Friday 1 of 1 GENERAL CONTRACTOR GENERAL CONTRACTOR REPRESENTATIVE ARRIVAL TIME DEPARTURE TIME DHI Don Durst 0930 1030 GRADING CONTRACTOR GRADING CONTRACTOR REPRESENTATIVE WEATHER/TEMPERATURE PERMIT O'Rear Excavating and Construction John Kangas Cloudy/56° F TYPE OF WORK SOURCE AND DESCRIPTION OF FILL MATERIAL GCN REPRESENTATIVE Repair of Soft Structural Fill NA Paul A. Crenna, CEG LOCATION OF WORK CONTRACTORS EQUIPMENT OBSERVED IN USE Lot 1 59 (PH 5 Lot 24) Tracked Excavator, Dump truck CONTRACTOR ACTIVITY,OBSERVATIONS,CONCLUSIONS,RECOMMENDATIONS I made this visit at the request of Reed Couch/Don Durst to observe removal of soft fill from the building envelope at arranged time requested by Mr. Kangas. While on site, I met with Mr. Kangus and spoke with Mr. Durst over the telephone. At the time of my visit, the excavation contractor had removed a large portion of the remaining soft fill, but soft fill was still present in some areas. Several lifts of imported crushed rock fill had been placed on the western-middle potion of building envelope and front garage wall. On the southwest quadrant of the building envelope, the subgrade was very- stiff native soil at depths of less than 4 feet below original finish grade but the subgrade had not yet been benched for footings. After conferring with Mr. Durst, I informed Mr. Kangas to contact me when the remaining soft fill was removed and the subgrade was ready for observation. Mr. Kangas stated he would be ready at 1300. A Preliminary report is provided solely as evidence that the field observation was performed. Observations,and/or conclusions,and/or recommendations FINAL ® PRELIMINARY conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. A final report is an instrument of professional service.My conclusions drawn from this report should be discussed with and evaluated by the professional involved. ITEMS TO OBSERVE,CHECK,OR TEST DURING NEXT VISIT FIELD REPRESENTATIVE SIGNATURE DATE March 4, 2016 GCN's professionals are represented on site solely to observe operations of the contractor identified,to form opinions about the adequacy of those operations,and to report those opinions to our client. The presence and activities of our field representative do not relieve any contractor from its obligation to meet contractual requirements.We rely on the contractor to comply with the plans and specifications throughout the duration of the oroiect.irrespective of the presence of our representative.The contractor retains sole responsibility for site safety and the methods.operations,and sequences. 824 SE 12th Avenue Portland,Oregon 97214 FIELD OBSERVATION REPORT GO Consultants Tel(503)616-9425 www.gcnweb.com Northwest, Inc. PROJECT ID DATE REPORT NO. Summit Ridge March 4, 2016 7 OWNER/CLIENT OWNER/CLIENT REPRESENTATIVE DAY OF WEEK PAGE D R Horton (DHI) Reed Couch Friday 1 of 1 GENERAL CONTRACTOR GENERAL CONTRACTOR REPRESENTATIVE ARRIVAL TIME DEPARTURE TIME DHI Don Durst 1300 1330 GRADING CONTRACTOR GRADING CONTRACTOR REPRESENTATIVE WEATHER/TEMPERATURE PERMIT O'Rear Excavating and Construction John Kangas Cloudy/56' F TYPE OF WORK SOURCE AND DESCRIPTION OF FILL MATERIAL GCN REPRESENTATIVE Repair of Soft Structural Fill NA Paul A. Crenna, CEG LOCATION OF WORK CONTRACTORS EQUIPMENT OBSERVED IN USE Lot 1 59 (PH 5 Lot 24) Tracked Excavator, Dump truck,vibratory sled compactor CONTRACTOR ACTIVITY,OBSERVATIONS,CONCLUSIONS,RECOMMENDATIONS: I made this visit at the request of Reed Couch/Don Durst to observe removal of soft fill from the building envelope at the arranged time requested by Mr. Kangas. While on site, I met with Mr. Kangus and left a voicemail message for Mr. Durst. At the time of my visit, the excavation contractor had removed the remaining soft fill from the building envelope. The subgrade is ready for placement of imported crushed rock backfill. An approximate 15-foot-wide and 8-foot-thick section of the existing rocky silt fill was left in place beneath the northern portion of the building envelope. This fill as exposed in a vertical excavation face is stiff with medium-stiff seams and isolated soft pockets. In our opinion,this fill may remain provided that it is laterally supported with a wedge of imported crushed rock fill on the middle portion of the building envelope and capped by a 1-to 2-foot-thick layer of crushed rock. The fill surface at the northeast quadrant of the building envelope has likely been damaged due to its use as an off-loading area and equipment staging area. I recommended to Mr. Kangus that once the stockpiled rock is taken away from this area, all soft material should be removed and the area backfilled with crushed rock. All crushed rock backfill should be compacted in lifts to at least 90%of the maximum dry density obtained by ASTM D1557 or equivalent. GCN should be contacted to verify backfill compaction. A Preliminary report is provided solely as evidence that the field observation was performed. Observations,and/or conclusions,and/or recommendations FINAL ® PRELIMINARY conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. A final report is an instrument of professional service. Any conclusions drawn from this report should be discussed with and evaluated by the professional involved. ITEMS TO OBSERVE,CHECK,OR TEST DURING NEXT VISIT FIELD REPRESENTATIVE SIGNATURE DATE March 4, 2016 GCN's professionals are represented on site solely to observe operations of the contractor identified,to form opinions about the adequacy of those operations,and to report those opinions to our dient. The presence and activities of our field representative do not relieve any contractor from its obligation to meet contractual requirements.We rely on the contractor to comply with the plans and specifications throughout the duration of the project.irrespective of the presence of our representative.The contractor retains sole responsibility for site safety and the methods.operations.and sequences. 1021 SE 33RD Avenue CPEO Portland,Oregon 97214 FIELD DENSITY TESTING REPORT Consultants Tel(603)702 8437 Northwest, Inc. PROJECT NUMBER PROJECT NAME PAGE OF PERT _ -.Stkvorr•tr 1^..tO 6- T LS t OWNERICUENT REPRESENTATIVE DATE DAY OF WEEK P 3-Li -illi FRI 13 A.y. GENERAL CONTRACTOR GENERAL CONTRACTOR REPRESENTATIVE ARRIVAL Tq�E DEPARTURE TIME /0:80 / 11:30 12:Capf/:o" . GRADINGpCONTRACTOR GRADING CONTRACTOR E RESENTATIVE [�WE/�TNERITEMP REPORT NI+rUBER Or TYPE OF WORK SOURCE AND DESCRIPTION OF FILL MATERIAL ASTM DUST/ r-•I ASTM D885$ N- PL 2 Dewts t i Y rt'sT.rd G 3/i/4klf _ Q AASNTir0 To o 1^l AASNTO TSS LOCATION OF WORK CONT ORS EOIIPMENT OBSERVED IN USE L-151- I 41 FIELD TESTING REFERENCE CURVE OPTatNO. LOCATION ELEVATION DRY MOISTURE PERCENT MAXIMUM DRY MOISTURE REQUIRED PASS/ DENSITY CONTENT MAXIMUM DENSITY CONTENT FAIL LOT ��� 0PKP., Geototoo o, wolf ao'r,A5 66S e. 117.0 CI q6 132-0 /0 4S 1 `- 1f1' la?-`f t d q7 P Gower, SaArINC, witLL Foot-,N c- >3 ti-St, 1.).-1.7 I D 9 4S 1 — c � 1a(e.9 1 9'6 \ \ 4-) :ONTRACTOR ACTIVITY,OBSERVATIONS,CONCLUSIONS,RECOMMENDATIONS: chN-strc r&D� ( 'ft, c�ropud1-- tri-f' c Cis;rY T.-PST-jet/C... Df 7Je !V `� o ID I pre e 01 Ors.) r--661-1 rya- IC3tise- 9 v j v ,e.e fl-R-tNG W A U-$. I esr sut�s A-4D 1. cA-i r0 J -stir).0,./ rt/3d✓to . • lipamir fe-r 2_ v.}H5 NtrT- R-65tay T I-trYl.P 6r' E'R.6r t1 ter t. Re Qu Irue D SEc ow 1%SLit Tt coNauc'7`r j .e;ntJG. ITEMS TO Off.CHECK OR TEST DURING NEXT VISIT/° /� FIELD REPRESENTATIVE E&SIGNATURE / L/ 1 J %J/ REVIEWED BY DATE �9rt�.r� nt1 1A.. / 8CN's professionals are represented on site solely to operations M coheactor IdereMed,to form opinions about the adequacy of Mose operations.and to report Mose opinions to ow client. The presence and=Whet of our Reid repreeentati do not relieve any cont mor from its obligation to meat contractual requirements. We rely on the 00,111111CIOC to comply with the piens and spacificattons Cro.gtnua the duration of the project,irrespective of the presence of ow representative The contractor retains sole responsibility for site safety and the rnetrods,operationsd sequences of construction. .ani! 824 SE 12th Avenue GEO Consultants Portland,Oregon 97214 FIELD OBSERVATION REPORT Tel(503)616-9425 Northwest, Inc. www.gcnweb.com PROJECT ID DATE REPORT NO. Summit Ridge March 8, 2016 OWNER/CUENT OWNER/CUENT REPRESENTATIVE DAY OF WEEK PAGE D R Horton (DHI) Reed Couch Tuesday 1 of 1 GENERALCONTRACTOR GENERAL CONTRACTOR REPRESENTATIVE ARRIVAL TIME DEPARTURE TIME DHI Don Durst 1 145 1215 GRADING CONTRACTOR GRADING CONTRACTOR REPRESENTATIVE WEATHER/TEMPERATURE PERMIT O'Rear Excavating and Construction John Kangus Showers/49° F TYPE OF WORK SOURCE AND DESCRIPTION OF FILL MATERIAL GCN REPRESENTATIVE Foundation Excavation NA Paul A. Crenna, CEG LOCATION OF WORK CONTRACTORS EQUIPMENT OBSERVED IN USE Lot 159 (PH 5 Lot 24) Tracked Excavator, vibratory sled compactor CONTRACTOR ACTIVITY,OBSERVATIONS,CONCLUSIONS,RECOMMENDATIONS I made this visit at the request of Don Durst to observe foundation excavation subgrade conditions for single-family home construction on Lot 1 59. While on site, I met with Mr. Kangus. I left a voicemail message for Mr. Durst. At the time of my visit, the contractor had completed about 90%of the structural fill repair with imported crushed rock, and was compacting crushed rock fill with a vibratory sled compactor. The southern portion of the excavation subgrade (with the exception of the southeast corner) is native, very-stiff silt. The following areas remain to be completed: 1. Southeast building corner-About a 1-foot-thick section of soft fill needs to be removed and replaced with compacted crushed rock fill. 2. Northeast building corner-Crushed rock fill is loose and needs to be compacted. Once the remaining crushed rock fill is placed at the above areas and passing density tests are obtained on finish grade surfaces, the subgrade will be prepared in general conformance with the project specifications and our recommendations, and should perform as intended to support single family home foundations. Footings should be formed such that they maintain a minimum 1 H:1 V setback from the base of unsupported near vertical cuts. A Preliminary report is provided solely as evidence that the field observation was performed. Observations,and/or conclusions,and/or recommendations FINAL PRELIMINARY conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report A final report is an instrument of professional service.My conclusions drawn from this report should be discussed with and evaluated by the professional involved. ITEMS TO OBSERVE,CHECK,OR TEST DURING NEXT VISIT Density testing of finish grade surfaces FIELD REPRESENTATIVE SIGNATURE DATE March 8, 2016 GCN's professionals are represented on site solely to observe operations of the contractor identified,to form opinions about the adequacy of those operations,and to report those opinions to our dient. The presence and activities of our field representative do not relieve any contractor from its obligation to meet contractual requirements.We rely on the contractor to comply with the plans and specifications throughout the duration of the project,irrespective of the presence of our representative. The contractor retains sole responsibility for site safety and the methods,operations,and sequences.