4513 31ST AVE SE 2019-04-23 - Laserfiche WebLink

a CEO E I z FIELD REPORT 1 of 3 Project Name: Everett River Front-Simpson Report: 088 GeoDesign#: Polygon-127-03 Date: 1/19/2018 Reports with Unresolved Nonconformance Issues: Permit: i PW1505-005 k Nick Abdelnour(Polygon) 1 Randy Allen(City of Everett) Weather: Cloudy, 40's Ron Bowen(Polygon) I Eddy Stevens(Polygon) l Arrival/Departure: 0815/0845 Distribution: Doug Ross(Polygon) l Kirk Keck(City of Everett) 1545/1600 i Paul MCKee(City of Everett) Dave Foster(City of Everett) Prepared By Ben Weinberg, EIT m Site Plan(s) m Density Test Summary Signature 4.;,— r� Attachments: — — -- ❑ Installation Records m Other Reviewed By r .„.„,. PURPOSE of VISIT: GeoDesign representative, Ben Weinberg, was on-site part time at the request of Craig with DDS to observe foundation subgrade for Lot 279. SUMMARY OF OBSERVATIONS: Lot 279: Previously, GeoDesign noted an approximately 25 feet long and 12 feet wide area in the southeast corner of the building area which could be probed up to 4.5 feet using a 1/2 inch diameter soil probe. Today, GeoDesign noted that DDS had over-excavated the area down 4 to 4.5 feet to expose a gray silty SAND with gravel which could be probed less than 1 inch using a 1/2 inch diameter soil probe. GeoDesign also noted that DDS had drained water away from the remaining foundation subgrade area and cleared previously built up loose and saturated soil. GeoDesign notified the contractor that that over-excavated area was currently suitable for placement of structural backfill material. GeoDesign noted that the backfill material consisted of a 2-4 inch clean crushed recycled concrete material which was tamped into a firm and unyielding mass using the bucket of an excavator; GeoDesign observed the backfilling of approximately 2.0 feet of the excavation prior to our departure from our morning visit. For the remainder of the foundation subgrade area, the exposed footing subgrade consisted of a gray silty SAND with gravel which could generally be probed less than 1 inch using a 1/2 inch diameter soil probe. Relative compaction of the footing subgrade material was tested using a Troxler Moisture-Density Gauge; in-place density tests indicated that the material had been compacted to greater than 95% of its maximum dry density as determined by a Modified Proctor analysis. During our afternoon site visit, GeoDesign noted that backfilling of the over-excavated area in the southeast corner had been completed. The top -2 feet of backfill material consisted of a 2-inch clean crushed rock material compacted into a firm and unyielding mass. GeoDesign notified the client and contractor that the foundation subgrade area observed today is currently suitable for support of the intended structure. We recommend that any loose and saturated material that may build up under the footing areas be removed prior to the installation of concrete forms, construction of reinforcing steel, and placement of concrete. A summary of our observations can be found in the attached Figure 1 and Nuclear Density Gauge Data. This report presents opinions formed as a result of our observation of activities relating to geotechnical engineering or environmental services. 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. Our work does not include supervision or direction of the contractor,the contractor's employees or agents. Our firm is not responsible for site safety.This field report is a DRAFT representation of our field observations,testing,and preliminary recommendations. The report can only be considered final upon review of the GeoDesign project manager,as indicated by initials in the"Reviewed By"section. 10700 Meridian Avenue North,Suite 402 I Seattle,WA 98133 I 206.838.9900 2502 Jefferson Avenue I Tacoma,WA 98402 I 253.203.0095 (27._\ lnol/