1810 104TH ST SE A T AND T WIRELESS ANTENNA 2022-12-02

Geotechnical Engineering bmfimort Irerracon SN4924—Silver Lake North Cell Tower Everett, Washington October 24, 2014 Terracon Project No. 81145043 Field Exploration Description The boring location was located in the field by Terracon personnel with a hand-held GPS unit with an accuracy of ±20 feet horizontal using the tower coordinates supplied in the Title Sheet drawing sheet number T1.0, dated July 24, 2014. The approximate location of the boring is shown on the Site & Exploration Plan that is attached in Appendix A. The exploration was drilled as close to the planned tower center coordinates location as possible within the paved area. The boring was drilled with a track drill rig using hollow-stem augers. An Automatic hammer was utilized for penetration testing and obtaining samples. The boring elevation was measured in the field relative to the ground surface elevation at the tower location. In the split-barrel sampling procedure, the number of blows required to advance a standard 2- inch O.D. split-barrel sampler the last 12 inches of the typical total 18-inch penetration by means of a 140-pound hammer with a free fall of 30 inches, is the standard penetration resistance value (SPT-N). This value is used to estimate the in situ relative density of cohesionless soils and consistency of cohesive soils. The samples were tagged for identification, sealed to reduce moisture loss, and taken to our laboratory for further examination, testing, and classification. Information provided on the boring log attached to this report includes soil descriptions, boring depth, sampling intervals, and groundwater conditions. The boring was backfilled with bentonite prior to the field engineer leaving the site. A field log of the boring was prepared by the field engineer during the field exploration in general accordance with the Unified Soil Classification System (USCS). The USCS is described in Appendix B. Collected soil samples from the boring were packaged and transported to our laboratory for further observation and testing. The final boring log included with this report represents the engineer's interpretation of the field log and included modifications based on laboratory observation and tests of the samples. Field measurements of soil resistivity using the Wenner Four-Electrode Method were performed in general accordance with ASTM G 57-78. A series of soil resistivity tests were performed adjacent to the boring location area along perpendicular lines. Responsive■ Resourceful■ Reliable Exhibit A-3