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June 3, 2015 <br />ES-3588.01 <br />Polygon NW <br />PO Box 1349 <br />Bellevue, Washington 98009 <br />Attention: Nir. Eddy Stevens <br />Subject: Final Report <br />Building 5, Lots 5.1 thru 5.7 <br />Building 6, Lots 6.1 thru 6.4 <br />Building 20, Lots 20.1 thru 20.8 <br />;� <br />' � ` ry f�,�� � �0118: <br />� . `;��.ic � <br />- < �''`i <br />Earth Solutions NW ��C <br />Construction Monitoring and Consulting Services <br />Silver Lake Center <br />Building 5-1904 thru 1928 — 113t" Place Southeast <br />Building 6- 1919 thru 1929 — 113t" Place Southeast <br />Building 20 - 11002 thru 11016 — 20t'' Drive Southeast <br />Everett, Washington <br />Dear Mr. Stevens: <br />0 C:;itc>ter:h;�ical �n�;i�ieeri'i�; <br />• {.;nnsh�uctiun ���1c>nito; in� <br />a Envir�}nrrien�_a) ��ienc��s <br />In accordance with your request, Earth Solutions NW, LLC (ESNW) provided construction <br />monitoring and consulting services at the subject site. Our services included providing onsite <br />observations and testing on a part-time from January 26 to April 3, 2015. Our representatives <br />made 11 site visits to observe building foundation subgrade and test building slab backfill. <br />Our representative observed building foundation subgrade to be dense and suitable for support <br />of the proposed structures. <br />Our representative conducted 50 field density tests in accordance with ASTM Test Designation <br />D2922 (Nuclear Gauge Method). Three representative soil samples were returned to our <br />laboratory for analysis of the maximum dry density and optimum moisture content in <br />accordance with ASTM D1557-02 (Modified Proctor}. Density test results indicate adequate <br />compaction of at least 95 percent at the tested locations of the building slab backfill. <br />Based on our observations and testing, the earthwork construction was accomplished in <br />accordance with the project plans and our geotechnical recommendations. <br />1; OS - 136tn PI� ce P�1.�., �ui:� 201 ��c,'cv,;;� `tir�,� <)sf0�'t5 ° i�;2:�i 44�)-��704 • FAX (125) '�49-471"; <br />;`;;� <br />