4417 31ST AVE SE 2018-03-28 - Laserfiche WebLink

• MIDESIGNZ FIELD REPORT , A-of-3 Project Name: Everett River Front-Simpson Report: 050 GeoDesign#: Polygon-127-03 Date: 06/16/2017 Reports with Unresolved Nonconformance Issues: Permit: PW1505-005 Nick Abdelnour(Polygon) Randy Allen(City of Everett) Weather. Cloudy, 60's Ron Bowen(Polygon) I Eddy Stevens(Polygon) Arrival/Departure: 0900/1515 Distribution: Doug Ross(Polygon) i Kirk Keck(City of Everett) Paul McKee(City of Everett) * !� Dave Foster(City of Everett) Prepared By: Ben Weinberg • Ea Site Plan(s) m Density Test Summary Signature: a✓ Attachments: a Installation Records m Other Reviewed By: SUMMARY of OBSERVATIONS: LOT 267: Previously,GeoDesign noted that the exposed subgrade material on the west 1/3 of the building area could be probed up to 3 feet using a 1/2 inch diameter soil probe and recommended that the material be over-excavated down to firm and unyielding soil and backfilled with structural fill material. Today,GeoDesign noted that DDS had over-excavated the west 1/3 of the building area was over-excavated approximately 5 feet down to material which could be probed less than 2 inches. GeoDesign also noted that the east 1/4 of the lot area exhibited pumping under the bucket of the excavator and could be probed up to 2 feet. GeoDesign recommended that the material be removed down to firm and unyielding ground. For the west portion,the material over-excavated consisted of a gray silty SAND with gravel which was approximately 10% over its optimum moisture content. For the eastern portion,the material excavated consisted of a mixture of a very moist brown silty SAND and a mixture of brown sandy SILT with organics(grass). GeoDesign observed DDS over-excavate the area up to 3 feet down to firm and unyielding material which could be probed less than 2 inches. GeoDesign notified the contractor that the over-excavated area were suitable for placement of backfill material.GeoDesign noted that DDS backfilled the over-excavated areas with a 2-inch clean crushed railroad ballast material which was tamped into a firm and unyielding mass using the bucket of an excavator and compacted using a smooth drum vibratory roller. It is the opinion of GeoDesign that the foundation area for Lot 267 is suitable for support of the intended structure. LO1rS168-274: Today,GeoDesign note that DDS had excavated the foundation and crawl space area for Lot 268. The exposed foundation subgrade soils generally consisted of a gray-brown silty SAND with gravel which could be generally probed generlally less than 1 inch using a 1/2 inch diameter soil probe.While driving the pin to take an in-place density test along the north perimeter of the lot area,GeoDesign noted a significant drop in pin resistance at approximately 12 inches below ground surface;penetration depths into the driven hole using a 1/2 inch diameter soil probe were 2 feet. GeoDesign had Craig with DDS excavate a test hole to evaluate the underlying fill material. Material encountered consisted of a very soft to soft brown sandy SILT with organics(grass/hay)which could be probed 3 feet using a soil probe;the soft material extended to depths up to 6 feet below plan bottom of footing. GeoDesign notified the client and contractor that the soft brown sandy SILT with organics encountered was not suitable for support of the intended structure and recommended that the material be removed and replaced with structural fill. GeoDesign noted that the material encountered appeared to be associated with a previously existing berm shown on the existing grade contours which was present from elevations ranging from 20 to 26 feet; pad subgrade for Lots 268-274 are at elevations ranging from 266 to 268 feet.Test excavations within Lot 270 exposed the same unsuitable material at approximately 3 feet BGS. A summary of our observations can be found in the attached Figure 1 and Photo Log. 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. ,1N{ 10700 Meridian Avenue North,Suite 402 I Seattle,WA 98133 1206.838.9900 2502 Jefferson Avenue I Tacoma,WA 98402 I 253.203.0095