2102 ROSS AVE 2018-01-02 MF Import

I_ NELSON GEOTECHNICAL -----'ONGA ASSOCIATES, INC. GEOTECHNICAL ENGINEERS & GEoLOGISTS Mahn office 17311 — 135" Avanue NE, A-500 W00dirIVIUV, WA 98072 (425) 486-1663 FAX (425) 481 :510 (425) 337.16M Snohomish County March 13, 2009 Mr. Rich McClean McClean Iron Works 6501 202th St:ect SW Lynnwood, Washington 98036 Construction )Monitoring Sununu)? letter McClean Ironworks 2000 Ross Avenue Everett, Washington NGA File No. 790308 Dear Mr. McClean: Engineonrg-Geotogy Branch 437 East Penny Road Wonslrhse, WA 98801 (509) 565-7606 FAX (609) 665-7692 This letter sum.-nnrizes our observations during the pin pile installation phase of the project. The site is located at 2000 Ross Avenue in Everett, Washington. We have previously prepared a letter titled "Deep Foundation Support — McClean Iron Works — Everett, WA," dated July 10, 2008 tmd a memo dated August 8, 2008 that. provided mcomrneudations for deep foundation support for the proposed building. We monitored pin -pile installation activities on a par,-drac basis during ale period of May 30, 2008 through February 11, 2009. Our observations were documented in Field Reports 1 through 52 which were submitted to you. Our services began by observing load tests on a 4-inch and 6-iuch pin pile. The piles were driven to a refusal criteria of less than one -inch of pile movement during 20 seconds of continuous driving for the 4-inch diameter pile and less than one -inch of pile movement during 30 sceouds of continuous driving for the 6-inch diameter pile. These piles were then successfully load tested to 200 percent of there design capacity which is 11-tons for the 4-inch diameter piles and 22-tons for the 6-inch diameter piles. After the load tests were performed, we ooserved 8 total of 408, 4-inch and 6-inch diameter pin piles driven to refusal to provide support for the building and crane foundations and slab. The pin piles were drivral to refusal using a 2,000 R-lb hydraulic rock breaker. The refusal criterion used was (V