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HomeMy WebLinkAboutSouthport Development Construction Summary Letter_Widening.pdf 1101 South Fawcett Avenue, Suite 200 Tacoma, Washington 98402 253.383.4940 December 10, 2018 Southport LLC 1083 Lake Washington Boulevard, Suite 50 Renton, Washington 98056 Attention: Scott Rosenstock Subject: Construction Observation Services Summary Letter Retaining Wall Construction and Road Widening Lake Washington Boulevard Improvement Renton, Washington File No. 21854-001-05 INTRODUCTION AND SUMMARY This letter presents a summary of our construction observation activities related to the retaining wall construction and road widening construction activities for the Southport Development Lake Washington Boulevard Improvement project located in Renton, Washington. We issued a revised geotechnical design report dated April 22, 2016 (geotechnical report) and a subsequent addendum letter dated May 8, 2018 that provided recommendations for design and construction of the Lake Washington Boulevard Widening. This phase of the project includes the widening of Lake Washington Boulevard to the south of the existing alignment from Garden Avenue North to Houser Way North. The road widening includes excavation into the Park Avenue embankment and subsequent embankment modification including a new Hilfiker spiral nail system. Also included is a new welded wire face wall (Hilfiker system) to support the newly widened portion of Lake Washington Boulevard. GeoEngineers provided an evaluation of the overall/global stability of the wall systems. Wall detailing and design was provided by Hilfiker. GeoEngineers’ representatives made site visits between August 28, 2018 and December 6, 2018 to observe construction activities. During this time, we observed: ■ Excavation into Park Avenue embankment for Hilfiker spiral nail system. Soils exposed in wall cut faces and subgrade were generally consistent with those identified in our report and used for stability analysis. ■ Installation of spiral nails, steel wire facing, and wall face backfill. ■ Subgrade soil condition for planned structural earth wall and other backfilled areas within widened portion of Lake Washington Boulevard.  THIS FIELD REPORT IS PRELIMINARY A preliminary report is provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. FIELD REPRESENTATIVE DATE Emily A. Walner 2018/08/28  THIS FIELD REPORT IS FINAL 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. REVIEWED BY DATE Lyle J. Stone 2018-08-29 This report presents opinions formed as a result of our observation of activities relating to our services only. We rely on the contractor to comply with the plans and specification throughout the duration of the project irrespective of the presence of our representative. Our work does not include supervision or direction of the work of others. Our firm will not be responsible for job or site safety of others on this project. DISCLAIMER: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. Attachments: Site Drawing Distribution: Brad Stocco; Scott Rosenstock We are on site today at the Lake Washington Boulevard project on Lake Washington Blvd at Houser Way N in Renton, WA, per the request of Scott Rosenstock (Seco) and Brad Stocco (City of Renton) to observe existing site conditions. While on site, we met with Brad. Our observations were generally as described below. Wall Cut Face Conditions On arrival, we observed crews to have completed rough excavation along the south side of Lake Washington Boulevard to the face of the uppermost of the two proposed Hilfiker walls, where spiral nails are proposed for installation. We observed the face of the excavation to generally consist of brown silty sand with gravel overlying an old roadway section, with a contact between the two proposed rows of spiral nails. We observed the old roadway section to generally consist of approximately 1 inch of asphalt overlying approximately 18 inches of brown silty sand with gravel overlying brown gravel with few fines (particle sizes approximately 3-6 inches in diameter). In our analysis of the global stability we assumed that the embankment consisted of “Common Borrow”. The soils observed in the cut are consistent with this assumption with regard to minimum strength characteristics. The larger particles (3-6 inches in diameter) could create issues with soil nail construction if they deflect the nails during installation. Excavation Bench Conditions We observed the soils immediately in front of the cut face, extending from the toe of the proposed upper wall toward the roadway, to generally consist of brown silty sand with gravel in a moist to wet condition. We observed wetter conditions near the center of the wall, where we observed the soils to yield under foot. We also observed portions of organic material through the existing ground surface, consisting of fine particles such as small branches and roots. The yielding area was observed to be approximately 8 feet (from the face of the wall) by 20 feet (along the face of the wall). The exposed soils in this are will form a bench that will be landscaped in accordance with project planting plans. The portion closest to the cut face will also need to support the face of the soil nail wall. If a firmer subgrade is required to support the facing of the soil nail wall, we recommend that this area be over excavated and replaced with a sand and gravel fill. We recommend the over-excavation occur AFTER the soil nails are installed so that the additional excavation does not further undercut the unsupported temporary cut face. Field Report File Number: 21854-001-05 1101 Fawcett Avenue, Suite 200 Tacoma, WA 98402 253.383.4940 Project: Lake Washington Boulevard Widening Date: 2018/08/28 (Tue) Owner: City of Renton Time of Arrival: 1400 Report Number: 01 Prepared by: E. A. Walner Location: Renton, WA Time of Departure: 1500 Page: 1 Purpose of visit: CMO Weather: Clear; 80’s °F Travel Time: ~1.5 hr. Upon arrival to the site I assessed personal safety hazards: Yes or Referred to Site Safety Plan and Safety Tailgate if applicable Safety Hazards Were Addressed by: Staying Alert to Construction and Equipment Hazards Other (describe) PPE File No. 0410-145-04 Page 2 FR GT-074 2018/07/31 Face of wall (looking northeast) Northernmost end of wet area and pavement section and gravel observable in face of wall cut File No. 21854-001-05 Page 3 FR 01 2018/08/28 Site Drawing  THIS FIELD REPORT IS PRELIMINARY A preliminary report is provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. FIELD REPRESENTATIVE DATE Clinton J. Lindgren 2018/09/05  THIS FIELD REPORT IS FINAL 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. REVIEWED BY DATE Lyle J. Stone 2018-09-07 This report presents opinions formed as a result of our observation of activities relating to our services only. We rely on the contractor to comply with the plans and specification throughout the duration of the project irrespective of the presence of our representative. Our work does not include supervision or direction of the work of others. Our firm will not be responsible for job or site safety of others on this project. DISCLAIMER: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. Attachments: Site Drawing Distribution: Brad Stocco; Scott Rosenstock We are on site today at the Lake Washington Boulevard project on Lake Washington Blvd at Houser Way N in Renton, WA, per the request of Scott Rosenstock (Seco) to observe existing site conditions. While on site, we met with Cameron (KLB Construction). Our observations were documented and are generally described below. Hilfiker Spiral Nail Wall Installation On arrival, we observed that crews had continued work on the uppermost of the two planned Hilfiker walls (see Site Drawing). We observed that two rows of the proposed spiral nails had been installed along the upper wall alignment. The contractor indicated that the spiral nails were 20 feet long and installed at a declination of 15 degrees below horizontal. This was consistent with our observations of the construction. Pilasters and wall facing had also been installed along the upper wall alignment, and the contractor was in the process of backfilling the wall facing with quarry spalls. Based on discussions with the contractor, we understand that the wet and yielding soils described in Field Report 1 were excavated and exported from the site after the wall facing had been installed. The contractor also indicated that during installation of the spiral nails, minor groundwater seepage had been observed within the central portion of the wall alignment but that it did not cause any issues during construction. We also observed crews installing erosion control BMPs, which were located above and below the wall alignment. BMPs generally consisted of straw waddles and high visibility silt fences. Based on our observations it appears that construction is proceeding in accordance with project plans, including the contractor supplied shop drawings for the Hilfiker Spiral Nail Wall system, and our recommendations. We will continue to make site visits through construction. Field Report File Number: 21854-001-05 1101 Fawcett Avenue, Suite 200 Tacoma, WA 98402 253.383.4940 Project: Lake Washington Boulevard Widening Date: 2018/09/05 (Tue) Owner: City of Renton Time of Arrival: 1400 Report Number: 02 Prepared by: Clinton J. Lindgren Location: Renton, WA Time of Departure: 1500 Page: 1 of 3 Purpose of visit: CMO Weather: Clear; 80’s °F Travel Time: ~1.5 hr. Upon arrival to the site I assessed personal safety hazards: Yes or Referred to Site Safety Plan and Safety Tailgate if applicable Safety Hazards Were Addressed by: Staying Alert to Construction and Equipment Hazards Other (describe) PPE File No. 21854-001-05 Page 2 FR 02 2018/09/05 Face of wall (looking northeast) Crews installing silt fencing near the toe of the uppermost Hilfiker wall (looking north) File No. 21854-001-05 Page 3 FR 02 2018/09/05 Site Drawing Approx. location of uppermost Hilfiker wall alignment, where crews were observed backfilling the facing with quarry spalls  THIS FIELD REPORT IS PRELIMINARY A preliminary report is provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. FIELD REPRESENTATIVE DATE Clinton J. Lindgren 2018/09/07  THIS FIELD REPORT IS FINAL 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. REVIEWED BY DATE Lyle J. Stone 2018-09-09 This report presents opinions formed as a result of our observation of activities relating to our services only. We rely on the contractor to comply with the plans and specification throughout the duration of the project irrespective of the presence of our representative. Our work does not include supervision or direction of the work of others. Our firm will not be responsible for job or site safety of others on this project. DISCLAIMER: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. Attachments: Site Drawing Distribution: Brad Stocco (City of Renton); Scott Rosenstock (Seco Development) We are on site today at the Lake Washington Boulevard project on Lake Washington Blvd at Houser Way N in Renton, WA, per the request of Scott Rosenstock (Seco) to observe existing site conditions. While on site, we met with Cameron (KLB Construction). Our observations were documented and are generally described below. Hilfiker Spiral Nail Wall Installation On arrival, we observed that crews finished backfilling the uppermost of the two planned Hilfiker walls with quarry spalls and were in the process of excavating for the lower Hilfiker wall (see Site Drawing). We observed that the cut for the wall was approximately 6 feet tall and exposed loose, brown to gray silty fine to medium sand generally consistent with the soils observed at a similar elevation in B-1 as documented in our geotechnical report. We noted that some of the areas in front of the wall cut were pumping under foot and there was some visible groundwater seepage. The contractor informed us that they planned to use steel plates to distribute the loads from their equipment when working in these relatively soft areas, specifically during the installation of the planned spiral nails. The pumping soil is, in our opinion, consistent with a temporary condition where groundwater pressure is released to the surface after excavation. We expect the pumping to diminish as groundwater comes back in to balance and achieves a new equilibrium. If the area remains soft, some permanent remediation should be considered. This remediation, if required, should occur after the soil nails have been installed. Based on our observations, it appears that construction is proceeding in accordance with project plans, including the contractor supplied shop drawings for the Hilfiker Spiral Nail Wall system, and our recommendations. We also observed that crews had installed a soil berm with a straw waddle that protected soil from getting into the area in the vicinity of the existing culverts. The contractor indicated that they plan to install a silt fence in this area for further protection of the area. See Site Drawing and attached picture for general locations. Crews indicated that they plan to continue excavation for the lower Hilfiker wall and will begin installation of the proposed spiral nails early next week. We will continue to make site visits through construction. Field Report File Number: 21854-001-05 1101 Fawcett Avenue, Suite 200 Tacoma, WA 98402 253.383.4940 Project: Lake Washington Boulevard Widening Date: 2018/09/07 (Fri) Owner: City of Renton Time of Arrival: 1130 Report Number: 03 Prepared by: Clinton J. Lindgren Location: Renton, WA Time of Departure: 1230 Page: 1 of 3 Purpose of visit: CMO Weather: Clear; 70’s °F Travel Time: ~1.5 hr. Upon arrival to the site I assessed personal safety hazards: Yes or Referred to Site Safety Plan and Safety Tailgate if applicable Safety Hazards Were Addressed by: Staying Alert to Construction and Equipment Hazards Other (describe) PPE File No. 21854-001-05 Page 2 FR 03 2018/09/07 Cut and subgrade soils for second tier of Hilfiker wall system (looking northeast) Berm and straw waddle protecting area near existing culverts (looking northeast) File No. 21854-001-05 Page 3 FR 03 2018/09/07 Site Drawing Approx. location of excavation for lower tier of Hilfiker Wall system observed today Approx. location of installed berm, straw waddle, and planned silt fence  THIS FIELD REPORT IS PRELIMINARY A preliminary report is provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. FIELD REPRESENTATIVE DATE Clinton Lindgren 2018/09/17  THIS FIELD REPORT IS FINAL 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. REVIEWED BY DATE Lyle J. Stone 2018-09-28 This report presents opinions formed as a result of our observation of activities relating to our services only. We rely on the contractor to comply with the plans and specification throughout the duration of the project irrespective of the presence of our representative. Our work does not include supervision or direction of the work of others. Our firm will not be responsible for job or site safety of others on this project. DISCLAIMER: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. Attachments: Site Drawing Distribution: Brad Stocco; Scott Rosenstock We are on site today at the Lake Washington Boulevard project on Lake Washington Blvd at Houser Way N in Renton, WA, per the request of Scott Rosenstock (Seco) to observe existing site conditions. While on site, we met with Cameron (KLB Construction). Our observations were documented and are generally described below. Hilfiker Spiral Nail Wall Installation On arrival, we observed that crews had continued work on the lower of the two planned Hilfiker walls (see Site Drawing). We observed that crews had begun installation of both rows of nails starting at the easternmost end of the site, working west-ward. We observed the soils comprising the cut face of the excavation behind the wall to generally consist of gray silty sand with gravel in a moist condition, which we interpret to be consistent with the soils observed in our explorations included in our geotechnical report. We understand from our discussions with the contractor that the soils at the east end of the wall appear to be more dense than the soils at the west end of the wall, based on completion of the upper wall and on conditions during initial excavation for the walls. The contractor indicated that the spiral nails were 20 feet long and installed at a declination of 15 degrees below horizontal. This was consistent with our observations of the construction. Pilasters and wall facing had also been installed along the wall alignments, and the contractor continued to backfill the wall facing with quarry spalls as work progressed. We also observed crews installing erosion control BMPs, which were located above and below the wall alignment. BMPs generally consisted of straw waddles and high visibility silt fences. Based on our observations it appears that construction is proceeding in accordance with project plans, including the contractor supplied shop drawings for the Hilfiker Spiral Nail Wall system, and our recommendations. We will continue to make site visits through construction. Field Report File Number: 21854-001-05 1101 Fawcett Avenue, Suite 200 Tacoma, WA 98402 253.383.4940 Project: Lake Washington Boulevard Widening Date: 2018/09/17 (Mon) Owner: City of Renton Time of Arrival: 1000 Report Number: 04 Prepared by: Clinton J. Lindgren Location: Renton, WA Time of Departure: 1330 Page: 1 of 3 Purpose of visit: CMO Weather: Clear; 80’s °F Travel Time: ~1.5 hr. Upon arrival to the site I assessed personal safety hazards: Yes or Referred to Site Safety Plan and Safety Tailgate if applicable Safety Hazards Were Addressed by: Staying Alert to Construction and Equipment Hazards Other (describe) PPE File No. 21854-001-05 Page 2 FR 04 2018/09/17 Face of wall (facing northeast) Crews installing spiral nails (facing northeast) File No. 21854-001-05 Page 3 FR 04 2018/09/17 Site Drawing Approx. location of lower Hilfiker wall alignment, where crews were observed installing spiral nails today  THIS FIELD REPORT IS PRELIMINARY A preliminary report is provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. FIELD REPRESENTATIVE DATE Clinton Lindgren 2018/09/19  THIS FIELD REPORT IS FINAL 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. REVIEWED BY DATE Lyle J. Stone 2018-09-28 This report presents opinions formed as a result of our observation of activities relating to our services only. We rely on the contractor to comply with the plans and specification throughout the duration of the project irrespective of the presence of our representative. Our work does not include supervision or direction of the work of others. Our firm will not be responsible for job or site safety of others on this project. DISCLAIMER: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. Attachments: Site Drawing Distribution: Brad Stocco; Scott Rosenstock We are on site today at the Lake Washington Boulevard project on Lake Washington Blvd at Houser Way N in Renton, WA, per the request of Scott Rosenstock (Seco) to observe existing site conditions. While on site, we met with Cameron (KLB Construction). Our observations were documented and are generally described below. Hilfiker Spiral Nail Wall Installation On arrival, we observed that crews had continued work on the lower of the two planned Hilfiker walls (see Site Drawing). We observed that crews had continued installation of both rows of nails, working west-ward toward the west end of the wall. We observed the soils comprising the cut face of the excavation behind the wall to generally consist of gray silty sand with gravel in a moist condition, which we interpret to be with soils observed in our explorations included in our geotechnical report. The contractor indicated that the spiral nails were 20 feet long and installed at a declination of 15 degrees below horizontal. This was consistent with our observations of the construction. Pilasters and wall facing had also been installed along the wall alignments, and the contractor continued to backfill the wall facing with quarry spalls as work progressed. We also observed crews installing erosion control BMPs, which were located above and below the wall alignment. BMPs generally consisted of straw waddles and high visibility silt fences. Based on our observations it appears that construction is proceeding in accordance with project plans, including the contractor supplied shop drawings for the Hilfiker Spiral Nail Wall system, and our recommendations. We will continue to make site visits through construction. Field Report File Number: 21854-001-05 1101 Fawcett Avenue, Suite 200 Tacoma, WA 98402 253.383.4940 Project: Lake Washington Boulevard Widening Date: 2018/09/19 (Wed) Owner: City of Renton Time of Arrival: 0800 Report Number: 05 Prepared by: Clinton J. Lindgren Location: Renton, WA Time of Departure: 1030 Page: 1 of 3 Purpose of visit: CMO Weather: Clear; 80’s °F Travel Time: ~1.5 hr. Upon arrival to the site I assessed personal safety hazards: Yes or Referred to Site Safety Plan and Safety Tailgate if applicable Safety Hazards Were Addressed by: Staying Alert to Construction and Equipment Hazards Other (describe) PPE File No. 21854-001-05 Page 2 FR 05 2018/09/19 Alignment of lower wall (facing west-southwest) Crews installing wall facing (facing south) File No. 21854-001-05 Page 3 FR 05 2018/09/19 Site Drawing Approx. location of lower Hilfiker wall alignment, where crews were observed installing spiral nails today  THIS FIELD REPORT IS PRELIMINARY A preliminary report is provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. FIELD REPRESENTATIVE DATE Clinton Lindgren 2018/10/01  THIS FIELD REPORT IS FINAL 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. REVIEWED BY DATE Lyle J. Stone 2018-09-28 This report presents opinions formed as a result of our observation of activities relating to our services only. We rely on the contractor to comply with the plans and specification throughout the duration of the project irrespective of the presence of our representative. Our work does not include supervision or direction of the work of others. Our firm will not be responsible for job or site safety of others on this project. DISCLAIMER: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. Attachments: Site Drawing Distribution: Brad Stocco; Scott Rosenstock We are on site today at the Lake Washington Boulevard project on Lake Washington Blvd at Houser Way N in Renton, WA, per the request of Scott Rosenstock (Seco) to observe existing site conditions. While on site, we met with Cameron (KLB Construction). Our observations were documented and are generally described below. Hilfiker Spiral Nail Wall Installation On arrival, we observed that crews had completed installation of the lower tier of the Hilfiker wall system (see Site Drawing). The wall facing had been backfilled with quarry spalls along its entire alignment. A layer of quarry spalls was also placed on the benches to resist erosion. Structural Earth Wall Installation We also observed that crews had begun installation of the structural earth wall in the northeastern portion of the site, immediately adjacent to Lake Washington Boulevard (see Site Drawing). We observed that approximately 3 to 5 feet of backfill had been placed for the earth wall. From discussions with the contractor, we understand that the backfill consisted of quarry spalls and was placed in lifts around the culvert pipes. The installed wall facing consisted of welded wire which was also backfilled with quarry spalls. The contractor informed us that they planned to continue backfilling the lower portion of the earth wall with quarry spalls in the northern part of the wall (see Site Drawing). We understand that the contractor plans to place imported gravel borrow material in lifts for the remaining upper portion of the earth wall once they have completed backfilling with quarry spalls. We obtained a sample of the gravel borrow in order to perform a proctor test for future compaction testing of the material. We also observed that erosion control BMPs were in place, which were located above and below the wall alignment. BMPs generally consisted of straw waddles and high visibility silt fences. Based on our observations it appears that construction is proceeding in accordance with project plans, including the contractor supplied shop drawings for the Hilfiker Retaining Wall system, and our recommendations. We will continue to make site visits through construction. Field Report File Number: 21854-001-05 1101 Fawcett Avenue, Suite 200 Tacoma, WA 98402 253.383.4940 Project: Lake Washington Boulevard Widening Date: 2018/10/01 (Mon) Owner: City of Renton Time of Arrival: 1100 Report Number: 06 Prepared by: Clinton J. Lindgren Location: Renton, WA Time of Departure: 1200 Page: 1 of 3 Purpose of visit: CMO Weather: Overcast; 60’s °F Travel Time: ~1.5 hr. Upon arrival to the site I assessed personal safety hazards: Yes or Referred to Site Safety Plan and Safety Tailgate if applicable Safety Hazards Were Addressed by: Staying Alert to Construction and Equipment Hazards Other (describe) PPE File No. 21854-001-05 Page 2 FR 06 2018/10/01 Top of lower tier Hilfiker spiral nail wall and earth wall in progress (facing west-southwest) Northern part of earth wall where crews plan to continue backfilling with quarry spalls (facing west) File No. 21854-001-05 Page 3 FR 06 2018/10/01 Site Drawing Approx. location of lower Hilfiker wall alignment, which had been completed Approx. location of structural earth wall observed being installed. Crews indicated they planned to continue backfilling the northern part (right) with quarry spalls  THIS FIELD REPORT IS PRELIMINARY A preliminary report is provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. FIELD REPRESENTATIVE DATE Clinton Lindgren 2018/10/02  THIS FIELD REPORT IS FINAL 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. REVIEWED BY DATE Lyle J. Stone 2018-10-02 This report presents opinions formed as a result of our observation of activities relating to our services only. We rely on the contractor to comply with the plans and specification throughout the duration of the project irrespective of the presence of our representative. Our work does not include supervision or direction of the work of others. Our firm will not be responsible for job or site safety of others on this project. DISCLAIMER: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. Attachment: Site Drawing Distribution: Brad Stocco; Scott Rosenstock We are on site today at the Lake Washington Boulevard project on Lake Washington Blvd at Houser Way N in Renton, WA, per the request of Scott Rosenstock (Seco) to observe existing site conditions. While on site, we met with Cameron and John (KLB Construction). Our observations were documented and are generally described below. Structural Earth Wall Installation On arrival, we observed that crews had continued installation of the structural earth wall in the northeastern portion of the site, immediately adjacent to Lake Washington Boulevard. We observed crews installing an intermediate lift of the wall in the northern part of the wall alignment (see Site Drawing). The installation generally consisted of the placement of a wire soil reinforcement mat on compacted gravel borrow material. Filter fabric was placed over the reinforcement mat and gravel borrow material was placed over the fabric. The gravel borrow backfill was compacted using a Mikasa MVH 408 plate compactor. We observed the contractor perform approximately 2 to 3 passes over the backfill during compaction. We evaluated the compacted backfill with a ½-inch diameter probe rod. Probe depths were on the order of approximately 1 to 3 inches, which we interpreted as adequately compacted. After the backfill was compacted, we observed the contractor wrap the filter fabric over the top of the backfill. A wire backing mat was installed over the reinforcement mat at the wall face and the face was then backfilled with quarry spalls. We also observed that erosion control BMPs were in place, which were located above and below the wall alignment. BMPs generally consisted of straw waddles and high visibility silt fences. From discussions with the contractor, we understand that they plan to continue installation of the structural earth wall. Based on our observations it appears that construction is proceeding in accordance with project plans, including the contractor supplied shop drawings for the Hilfiker Retaining Wall system, and our recommendations. We will continue to make site visits through construction. Field Report File Number: 21854-001-05 1101 Fawcett Avenue, Suite 200 Tacoma, WA 98402 253.383.4940 Project: Lake Washington Boulevard Widening Date: 2018/10/02 (Tues) Owner: City of Renton Time of Arrival: 1045 Report Number: 07 Prepared by: Clinton J. Lindgren Location: Renton, WA Time of Departure: 1315 Page: 1 of 3 Purpose of visit: CMO Weather: Overcast; 60’s °F Travel Time: ~1.5 hr. Upon arrival to the site I assessed personal safety hazards: Yes or Referred to Site Safety Plan and Safety Tailgate if applicable Safety Hazards Were Addressed by: Staying Alert to Construction and Equipment Hazards Other (describe) PPE File No. 21854-001-05 Page 2 FR 07 2018/10/02 Compaction of gravel borrow backfill over filter fabric (facing northeast) Placement of rock spalls at face of structural earth wall (facing west) File No. 21854-001-05 Page 3 FR 07 2018/10/02 Site Drawing Approx. location of structural earth wall previously installed. Approx. location of structural earth wall observed being installed today.  THIS FIELD REPORT IS PRELIMINARY A preliminary report is provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. FIELD REPRESENTATIVE DATE Clinton Lindgren 2018/10/05  THIS FIELD REPORT IS FINAL 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. REVIEWED BY DATE Lyle J. Stone 2018-10-08 This report presents opinions formed as a result of our observation of activities relating to our services only. We rely on the contractor to comply with the plans and specification throughout the duration of the project irrespective of the presence of our representative. Our work does not include supervision or direction of the work of others. Our firm will not be responsible for job or site safety of others on this project. DISCLAIMER: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. Attachment: Site Drawing Distribution: Brad Stocco; Scott Rosenstock We are on site today at the Lake Washington Boulevard project on Lake Washington Blvd at Houser Way N in Renton, WA, per the request of Scott Rosenstock (Seco) to observe existing site conditions. While on site, we met with Cameron and John (KLB Construction). Our observations were documented and are generally described below. Structural Earth Wall Installation On arrival, we observed that crews had finished backfilling the structural earth wall in the northeastern portion of the site, immediately adjacent to Lake Washington Boulevard (see Site Drawing). We observed that crews had installed the final lift of gravel borrow material for the earth wall. We observed the contractor compact the backfill using a Mikasa MVH 408 plate compactor. The contractor performed approximately 2 to 3 passes over the backfill during compaction. We evaluated the compacted backfill with a ½-inch diameter probe rod. Probe depths were on the order of approximately 1 to 3 inches, which we interpreted as adequately compacted. We also evaluated the compaction with a nuclear densometer (see Density Test Table). Density tests indicated that compaction met or exceeded 95 percent of the maximum dry density for the material which was previously determined in accordance with ASTM D 1557. We observed that erosion control BMPs were in place, which were located above and below the wall alignment. BMPs generally consisted of straw waddles and high visibility silt fences. From discussions with the contractor, we understand that utilities are planned be placed in the structural earth wall area. We also understand that the utilities will be covered and the remainder of the wall will be constructed using a base course material for backfill up to the pavement subgrade elevation. In summary, during construction we observed the contractor install the structural earth wall in lifts. The lifts consisted of steel wire reinforcement mats with an additional wire backing installed at the wall face. Filter fabric was placed a few feet back from the wall face and wrapped around compacted backfill. Compacted backfill consisted of gravel backfill material previously discussed in this field report. The wall face was backfilled with quarry spalls. Lifts were installed around six culverts which are located in the southwestern half of the wall alignment. Based on our observations throughout construction, it appears that the structural earth wall was installed in accordance with project plans, including the contractor supplied shop drawings for the Hilfiker Retaining Wall system, and our recommendations. We understand that in order to complete the structural wall, lifts of base course material are planned to be placed, bringing the wall height to the planned pavement subgrade elevation. We will continue to coordinate with the contractor and make site visits through construction and coordinate with the on-site contractor as work progresses. Field Report File Number: 21854-001-05 1101 Fawcett Avenue, Suite 200 Tacoma, WA 98402 253.383.4940 Project: Lake Washington Boulevard Widening Date: 2018/10/05 (Fri) Owner: City of Renton Time of Arrival: 0900 Report Number: 08 Prepared by: Clinton J. Lindgren Location: Renton, WA Time of Departure: 1030 Page: 1 of 6 Purpose of visit: CMO Weather: Overcast; 60’s °F Travel Time: ~1.5 hr. Upon arrival to the site I assessed personal safety hazards: Yes or Referred to Site Safety Plan and Safety Tailgate if applicable Safety Hazards Were Addressed by: Staying Alert to Construction and Equipment Hazards Other (describe) PPE File No. 21854-001-05 Page 2 FR 08 2018/10/05 Completed Hilfiker Spiral Nail walls (facing southwest) Compaction of final lift of gravel borrow material on structural earth wall (facing southwest) File No. 21854-001-05 Page 3 FR 08 2018/10/05 Culverts installed within structural earth wall (facing southwest) Quarry spalls placed at wall face behind wire backing (facing south) File No. 21854-001-05 Page 4 FR 08 2018/10/05 Filter fabric wrapped around compacted gravel borrow backfill (facing south) Creek area established at toe of wall systems directed to in-place culverts (facing northeast) File No. 21854-001-05 Page 5 FR 08 2018/10/05 Site Drawing Approx. location of structural earth wall (final lift of compacted gravel borrow) evaluated today Approx. location of spiral nail walls previously installed LEGEND - Approx. location of density test taken today File No. 21854-001-05 Page 6 FR 08 2018/10/05  THIS FIELD REPORT IS PRELIMINARY A preliminary report is provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. FIELD REPRESENTATIVE DATE Clinton Lindgren 2018-11-08  THIS FIELD REPORT IS FINAL 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. REVIEWED BY DATE Lyle J. Stone 2018-11-12 This report presents opinions formed as a result of our observation of activities relating to our services only. We rely on the contractor to comply with the plans and specification throughout the duration of the project irrespective of the presence of our representative. Our work does not include supervision or direction of the work of others. Our firm will not be responsible for job or site safety of others on this project. DISCLAIMER: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. Attachment: Site Drawing Distribution: Brad Stocco; Scott Rosenstock We are on site today at the Lake Washington Boulevard project on Lake Washington Blvd at Houser Way N in Renton, WA, per the request of Scott Rosenstock (Seco) to observe existing site conditions. While on site, we met with Cameron and John (KLB Construction). Our observations were documented and are generally described below. Cut and Backfill Observation On arrival, we observed that crews had excavated in the southwestern portion of the project site, to the southwest of the Hilfiker structural earth wall (see Site Drawing). The area was about 100 feet long, 10 feet wide, and 3 to 4 feet deep. It is our understanding that this area is in the vicinity of a planned widened portion of Lake Washington Boulevard. Excavated material generally consisted of brown silty sand with gravel and organic material such as roots and decomposed wood. The exposed subgrade generally consisted of brown to gray-brown, silty sand with gravel and iron- oxide staining. It appeared that as part of excavation to subgrade elevation, the majority of the organic material had been excavated from the area. We evaluated the subgrade with a ½-inch diameter probe rod. Probe depths were on the order of about 2 to 8 inches. We observed crews place filter fabric over the exposed subgrade. Gravel borrow material backfill was then placed over the filter fabric in approximately 12-inch-thick lifts. The backfill was compacted with a Mikasa MVH 408 plate compactor. We observed the contractor perform three passes over the backfill during compaction. We evaluated the compacted backfill with a ½-inch diameter probe rod. Probe depths were on the order of approximately 1 to 3 inches. Based on discussions with the contractor, we understand that they plan to continue backfilling the area in 12-inch lifts until they reach the planned base course subgrade elevation. The contractor estimated that there will be about 3 to 4 lifts needed to reach the required subgrade elevation. The contractor indicated that after the area was backfilled and compacted, they planned to cover the soils with plastic sheeting for moisture protection. We noted that the areas in the vicinity of the previously-installed Hilfiker retaining wall had also been covered in plastic sheeting. We indicated that we planned to return to site Monday, November 12, 2018, in order to evaluate compaction at the top of the backfill. Based on our observations it appears that construction is proceeding in accordance with project plans and our recommendations. We will continue to make site visits through construction. Field Report File Number: 21854-001-05 1101 Fawcett Avenue, Suite 200 Tacoma, WA 98402 253.383.4940 Project: Lake Washington Boulevard Widening Date: 2018/11/08 (Thurs) Owner: City of Renton Time of Arrival: 1000 Report Number: 09 Prepared by: Clinton J. Lindgren Location: Renton, WA Time of Departure: 1215 Page: 1 of 3 Purpose of visit: CMO Weather: Overcast; 40’s °F Travel Time: ~1.5 hr. Upon arrival to the site I assessed personal safety hazards: Yes or Referred to Site Safety Plan and Safety Tailgate if applicable Safety Hazards Were Addressed by: Staying Alert to Construction and Equipment Hazards Other (describe) PPE File No. 21854-001-05 Page 2 FR 09 2018/11/08 Crews placing filter fabric over excavated subgrade (facing southwest) Crews placing gravel borrow material backfill and compacting with sled (facing west) File No. 21854-001-05 Page 3 FR 09 2018/11/08 Site Drawing Approximate location of area observed excavated and backfilled today N  THIS FIELD REPORT IS PRELIMINARY A preliminary report is provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. FIELD REPRESENTATIVE DATE Clinton Lindgren 2018/11/12  THIS FIELD REPORT IS FINAL 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. REVIEWED BY DATE Lyle J. Stone 2018-11/12 This report presents opinions formed as a result of our observation of activities relating to our services only. We rely on the contractor to comply with the plans and specification throughout the duration of the project irrespective of the presence of our representative. Our work does not include supervision or direction of the work of others. Our firm will not be responsible for job or site safety of others on this project. DISCLAIMER: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. Attachment: Site Drawing; Summary of In-place Moisture and Density Test Distribution: Brad Stocco; Scott Rosenstock We are on site today at the Lake Washington Boulevard project on Lake Washington Blvd at Houser Way N in Renton, WA, per the request of Scott Rosenstock (Seco) to observe existing site conditions. While on site, we met with Cameron and John (KLB Construction). Our observations were documented and are generally described below. Cut and Backfill Observation On arrival, we observed that crews had completed backfilling the area previously observed in the southwestern portion of the project site, to the southwest of the Hilfiker structural earth wall (see Site Drawing). The area was about 100 feet long, 10 feet wide, and 3 to 4 feet deep. It is our understanding that this area is in the vicinity of a planned widened portion of Lake Washington Boulevard. Gravel borrow material was used for backfilling the area, which was approximately 3 to 4 feet thick. Based on our observations and discussions with the contractor, we understand that the backfill was placed in approximately 12-inch- thick lifts. The backfill was compacted with a Mikasa MVH 408 plate compactor. We evaluated the compacted backfill with a ½-inch diameter probe rod. Probe depths were on the order of approximately 1 to 3 inches. We also evaluated the compaction with a nuclear densometer (see Density Test Table). Density tests indicated that compaction met or exceeded 95 percent of the maximum dry density for the material which was previously determined in accordance with ASTM D 1557. Based on our tests and observations it is our opinion that the fill is adequately compacted and it appears that construction is proceeding in accordance with project plans and our recommendations. It is our understanding that top course material is planned to be placed on the compacted gravel borrow material we previously evaluated. We will continue to make site visits through construction. Field Report File Number: 21854-001-05 1101 Fawcett Avenue, Suite 200 Tacoma, WA 98402 253.383.4940 Project: Lake Washington Boulevard Widening Date: 2018/11/12 (Mon) Owner: City of Renton Time of Arrival: 1000 Report Number: 10 Prepared by: Clinton J. Lindgren Location: Renton, WA Time of Departure: 1045 Page: 1 of 4 Purpose of visit: CMO Weather: Overcast; 40’s °F Travel Time: ~1.5 hr. Upon arrival to the site I assessed personal safety hazards: Yes or Referred to Site Safety Plan and Safety Tailgate if applicable Safety Hazards Were Addressed by: Staying Alert to Construction and Equipment Hazards Other (describe) PPE File No. 21854-001-05 Page 2 FR 10 2018/11/12 Compacted gravel borrow material evaluated today (facing northeast) File No. 21854-001-05 Page 3 FR 10 2018/11/12 Site Drawing Approx. location of backfilled area (final lift of compacted gravel borrow) evaluated today LEGEND - Approx. location of density test taken today File No. 21854-001-05 Page 4 FR 10 2018/11/12  THIS FIELD REPORT IS PRELIMINARY A preliminary report is provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. FIELD REPRESENTATIVE DATE Clinton Lindgren 2018/11/19  THIS FIELD REPORT IS FINAL 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. REVIEWED BY DATE Lyle J. Stone 2018/12/02 This report presents opinions formed as a result of our observation of activities relating to our services only. We rely on the contractor to comply with the plans and specification throughout the duration of the project irrespective of the presence of our representative. Our work does not include supervision or direction of the work of others. Our firm will not be responsible for job or site safety of others on this project. DISCLAIMER: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. Attachment: Site Drawing Distribution: Brad Stocco; Scott Rosenstock We are on site today at the Lake Washington Boulevard project on Lake Washington Blvd at Houser Way N in Renton, WA, per the request of Scott Rosenstock (Seco) to observe existing site conditions. While on site, we met with Cameron (KLB Construction). Our observations were documented and are generally described below. Backfill Observation On arrival, we observed that crews were in the process of placing top course material over the Hilfiker earth wall and in the southwestern portion of the project site, to the southwest of the earth wall (see Site Drawing). The filled area generally spanned the length of the site and was about 1 to 2 feet deep. It is our understanding that the area is in the vicinity of a planned widened portion of Lake Washington Boulevard. Top course material consisted of 1¼-inch minus crushed rock and was approximately 1 to 2 feet thick. Based on our observations and discussions with the contractor, we understand that the backfill was placed in approximately 12-inch- thick lifts. The backfill was compacted with a Mikasa MVH 408 plate compactor. We evaluated the compacted backfill with a ½-inch diameter probe rod. Probe depths were up to approximately one inch across the filled area. Based on our evaluation and observations it is our opinion that the fill is adequately compacted and it appears that construction is proceeding in accordance with project plans and our recommendations. It is our understanding that the backfilled area is planned to be paved in the near future. We are available upon request to make additional site visits as needed. Field Report File Number: 21854-001-05 1101 Fawcett Avenue, Suite 200 Tacoma, WA 98402 253.383.4940 Project: Lake Washington Boulevard Widening Date: 2018/11/19 (Mon) Owner: City of Renton Time of Arrival: 1315 Report Number: 11 Prepared by: Clinton J. Lindgren Location: Renton, WA Time of Departure: 1345 Page: 1 of 3 Purpose of visit: CMO Weather: Clear; 50’s °F Travel Time: ~1.5 hr. Upon arrival to the site I assessed personal safety hazards: Yes or Referred to Site Safety Plan and Safety Tailgate if applicable Safety Hazards Were Addressed by: Staying Alert to Construction and Equipment Hazards Other (describe) PPE File No. 21854-001-05 Page 2 FR 11 2018/11/19 1¼-inch minus top course material being placed today (facing southwest) Top course material after compaction (facing northeast) File No. 21854-001-05 Page 3 FR 11 2018/11/19 Site Drawing Approx. location of backfilled area (top course material) placed and evaluated today N Locations are approximate and Site Drawing is not to scale  THIS FIELD REPORT IS PRELIMINARY A preliminary report is provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations conveyed in the final report may vary from and shall take precedence over those indicated in a preliminary report. FIELD REPRESENTATIVE DATE Clinton Lindgren 2018/12/06  THIS FIELD REPORT IS FINAL 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. REVIEWED BY DATE Lyle J. Stone 2018/12/10 This report presents opinions formed as a result of our observation of activities relating to our services only. We rely on the contractor to comply with the plans and specification throughout the duration of the project irrespective of the presence of our representative. Our work does not include supervision or direction of the work of others. Our firm will not be responsible for job or site safety of others on this project. DISCLAIMER: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. Attachment: Site Drawing Distribution: Brad Stocco; Scott Rosenstock We are on site today at the Lake Washington Boulevard project on Lake Washington Blvd at Houser Way N in Renton, WA, per the request of Scott Rosenstock (Seco) to observe existing site conditions. While on site, we met with John and Cameron (KLB Construction). Our observations were documented and are generally described below. Subgrade Evaluation On arrival, paving crews were on site and preparing to pave over the backfill previously placed. The planned paving area spanned over the constructed Hilfiker Retaining Wall system and other backfill areas to the southwest of the Hilfiker Wall (see Site Plan). Throughout construction of the Hilfiker Wall and other backfill activities, we made site visits to document construction activities. A brief summary of our observations of construction of the Hilfiker Retaining Wall system is documented in Field Report 8. Other backfill activities generally consisted of backfilling areas to the planned pavement subgrade elevation and were observed and reported in Field Reports 8 through 11. The exposed pavement subgrade consisted of 1¼-inch minus crushed rock which we had previously observed placed and compacted. Prior to paving, we observed crews perform a proof roll of the pavement subgrade with a fully loaded haul truck. During the proof roll, we did not observe significant deflection or pumping under the truck tires. Asphalt Paving Based on discussions with crews, we understand that the overall pavement thickness will be 8 inches. We understand that crews plan to place two 3-inch-thick lifts of hot mix asphalt today, and that a upper 2-inch-thick layer will be placed at a later date. We observed crews place the initial 3-inch-thick lift of asphalt over the exposed subgrade with a paver. Crews compacted the asphalt with a twin drum vibratory steel roller. A representative from Mayes Testing was present during compaction and took asphalt density tests throughout the paved area. Observed asphalt density tests ranged from about 92 to 93 percent compaction. Conclusions Based on our evaluation and observation of the proof roll it is our opinion that the subgrade was in an adequate condition prior to paving. It also appeared that the asphalt was being placed and compacted in accordance with project plans and specifications. We are available upon request to make additional site visits as needed. Field Report File Number: 21854-001-05 1101 Fawcett Avenue, Suite 200 Tacoma, WA 98402 253.383.4940 Project: Lake Washington Boulevard Widening Date: 2018/12/06 (Thurs) Owner: City of Renton Time of Arrival: 0920 Report Number: 12 Prepared by: Clinton J. Lindgren Location: Renton, WA Time of Departure: 1220 Page: 1 of 3 Purpose of visit: CMO Weather: Clear; 30’s °F Travel Time: ~1.5 hr. Upon arrival to the site I assessed personal safety hazards: Yes or Referred to Site Safety Plan and Safety Tailgate if applicable Safety Hazards Were Addressed by: Staying Alert to Construction and Equipment Hazards Other (describe) PPE File No. 21854-001-05 Page 2 FR 12 2018/12/06 Proof roll performed over exposed subgrade prior to paving (facing southwest) Compaction of hot mix asphalt during paving (facing northeast) File No. 21854-001-05 Page 3 FR 12 2018/12/06 Site Drawing Approx. location of area proof rolled and subsequently paved today N Locations are approximate and Site Drawing is not to scale