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Report (6) etVicr a20/9-40/9& Sherman Engineering, Inc. (503) 230-8576 Ph 3 15 I NE Sandy BLVD. #100, Portland, OR 97232 (503) 226-4745 Fax MEMORANDUM TO: Mr. Rich Eisenhauer Residential Design 6925 SW Netarts Ct. Beaverton, OR 97007 ,�Q,(.D PROFFd, : �GINE �Qf DATE: December 9, 2015 a `� 1 16 r p FROM: Stig Widell, PE .G rGo Associate 00 RE: Nguyen Residence EXPIRES: 6/30/. 12412 SW Autumn View Dr. Tigard, Oregon NOTE: This memo is intended to provide our recommendations requested by city inspector David Young. The deck post pin-pile caps shall be provided a minimum of 8" of cover. Use 5/8" dia. RedHead with a minimum embedment of 5" for ABU post bases. 3" clear shall be provided between Pile cap and bottom of embedded anchor. • If you have any questions please give me a call. CC: Mr. John Duncan File-EIS 120915.doc Sherman Englneering, Inc. (503) 230-8876 Ph 3 15 I NE Sandy BLVD. #100, Portland, OR 97232 (503) 226-4745 Fax MEMORANDUM • TO: Mr. Rich Eisenhauer Residential Design 6925 SW Netarts Ct. Beaverton, OR 97007 ��a PROFe ,, C �G'N EF O* DATE: December 7, 2015 A 44/ 1 16 FROM: Stig Widell, PE � �, p OR ON Associate 00 GAY i 0,19°P� `yP sHER'" RE: Nguyen Residence EXPIRES: 6/30/ le 12412 SW Autumn View Dr. Tigard, Oregon NOTE: This memo is intended to clarify outstanding items specified by the site inspector. It is our understanding that the back tie beam, specified in the memo dated November 10, 2015, is to be attached to the main house with a modification to detail R1. The detail R1 calls for the rebar to be post-installed into the existing footing with epoxy. In lieu of this connection, existing foundation bars were left exposed and will lap with the new tie beam bars and shall be considered adequate to make this connection. This is a cast in place condition and special inspection is not required. It has also been noted that the exterior sheathing has been exposed over the summer and we have observed the condition of the plywood and found no evidence of damage caused by this exposure. No swelling of the panels was observed and no instances of nail head pushout were observed. We approve the condition of the existing roof and wall plywood sheathing: If you have any questions please give me a call. CC: Mr. John Duncan File-EIS 120715.doc m' r; /9-ear& Earth 2411 Southeast 8th Avenue • Camas • WA 98607 Engineers, Phone: 360-567-1806 • Fax: 360-253-8624 Inc. www.earth-engineers.com MEMORANDUM ADDRESSING CONCERNS FROM THE CITY OF TIGARD To: TimberRidge Development 1001 Northwest Lovejoy Street, #812 Portland, Oregon 97209 Attention: John Duncan From: Jeremy Fissel, PE - Project Manager EEI Report No.: 15-004-11 Date: December 7, 2015 Subject: City of Tigard Request for Proposed Pile Cap Capacities for the New Single Family Residence at 12412 Southwest Autumnview Drive Tigard, Oregon Permit No.: City of Tigard #MTS2014-00196 Mr. Duncan: We understand that the City of Tigard inspector for the project has requested that the Geotechnical Engineer confirm that the current fill soils surrounding the proposed pile caps are suitable for the planned construction. This memorandum addresses those concerns. Due to the existing site topography, EEI had recommended in our Report No. 15-004-09 dated 5/4/2015 that the rear porch foundation be supported by 4-inch diameter pin piles driven to refusal. We recommended an allowable axial capacity of 16 kips for these deep foundations — this includes a safety factor of 2 based on published pile testing data. Sherman Engineering has structurally designed the pile caps for this project. We understand the lateral loading of the rear porch structure will primarily be transferred to the new residence (i.e. no lateral load will be going into the piles from the structure). On 11/20/2015 an EEI representative had observed the 4-inch dimeter pin piles had been driven to refusal. Because the vertical loading of the rear porch is transferred through the proposed pile caps to the installed pin piles as recommended by EEI, the fill soils surrounding the proposed pile caps will not adversely affect our recommended pile capacity. Should you need additional information, please do not hesitate to contact us.