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Dent Residence Final Special Inspections Letter.pdfROBINSON NOBLE August 1, 2014 Mr, Paul Dent 16330 - 751h Place West Edmonds, Washington 98026 Final Special Inspections Letter 16330 - 7511 Place West Edmonds, Washington RN File No. 3000-030B Permit No. BLD20130211 Dear Mr. Dent: This letter summarizes our geotechnical construction -monitoring observations for your single- family residential project. The site is located at 16330 7511 Place West, in Edmonds, Washington. We have previously prepared a geotechnical report for the site dated March 12, 2012. We have also prepared a revised plan review and statement of risk letter dated February 14, 2013 and a plan review of storm sewer discharge line and wintertime grading letter dated August 8, 2013. We observed geotechnical aspects of construction on a part-time basis from September 11, 2013 to July 23, 2014. Our observations have been documented in Field Reports 1 through 10 As required by the City of Edmonds, we have satisfied the following required geotechnical special inspection tasks that were set forth in the City of Edmonds - Engineering Division Special Inspections and Testing Agreement dated August 27, 2013 and the pre -construction meeting on September 11, 2013. City of Edmonds Special Inspections requirements include: 1. Soil Bearing Verification and Overexcavation 2. Erosion and Sediment Control 3. Storm Install on Slope a. Pile Anchors b. Slope Stability 4. In-place Soil Density Tests of the Structural Fill, if needed, 1. Soil Bearing Verification and Overexcavation We observed the overexcavation and backfill for the foundations of the building. We verified that the foundation subgrade soils had been overexcavated a minimum of 2 feet, backfilled with granular structural fill and capable of supporting 1,500 psf as described in our geotechnical engineering report. 3011 South Huson Street, Suite A 17625 130111 Avenue, NE, Suite 102 Tacoma, Washington 98409 www.robinson-noble.com Woodinville, Washington 98072 P: 263,47517111 F: 251472.5846 P:425:488.0599 1 F: 425.4881330 Final Special Inspections Letter 16330 - 75' Place West Edmonds, Washington RN File No. 3000-030B Permit No. BLD20130211 August l,2014 Page 2 2. Erosion and Sediment Control We observed erosion control measures while on site and when a rain event of '✓a inch or more occurred. A silt fence was in place on the west side of the property on the downhill side of the site. We did not observe any sediment leaving the site during our visits. 3. Storm Install on Slope a. Pipe Anchors We observed the anchors and the pipe in the trench. The pipe was anchored in accordance with project plans, b. Slope Stability We observed the effects of construction on the stability of the slope. We did not observe any indication of slope movement. 4. In-place soil density tests of the structural fill, as needed In our opinion, in-place soil density testing on the structural fill was not needed. The structural fill consisted of clean crushed rock that was placed in accordance with our geotechnical engineering report. Based on our observations, it is our opinion that the required geotechnical special inspection items have been completed per City of Edmonds requirements and approved project plans. In our opinion the above described earthwork -related activities have been completed in accordance with our recommendations. Within the limitations of scope, schedule and budget for our services, we have strived to take care that our services have been completed in accordance with generally accepted practices followed in this region at the time this letter was prepared. No other conditions, expressed or implied, should be understood. Robinson Noble, Inc. Final Special Inspections Letter 16330 — 7611 Place West Edmonds, Washington RN File No. 3000-030B Permit No. BLD20130211 August 1, 2014 Page 3 We appreciate the opportunity to be of service to you. If there are any questions concerning this letter or if we can provide additional services, please call. Sincerely, Robinson Noble, Inc. 4`y ��13 Kevin H. Biersner, EIT Staff Engineer Barbara A. Gallagher, PE Senior Project Engineer Robinson Noble, Rnc,