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HomeMy WebLinkAboutPermit Correspondence 1992-6-4 / -- @ '- Branch Engineering "\ June 4, 1992 212 m St:reet: Springfield, Oregon 97477 [503] 746-0637 FAX [503] 746-0389 Tom Marx City of Spnngfield Planmng and Development 225 North Fifth Spnngfield, OR 97477 Re #<l20602 - 192 Chapman Lan" "prmgfield Dear Tom As you know, the foundatIOns placed beneath remodeled areas at the above reSidence were mstalled at vanance with Code provlSlons The footmgs were shallow with respect to the wall height, and the concrete used was site mixed, with an unknown mix deSign To remedy the shallow footmgs, additional pressure treated Sills are bemg mstalled, to make the distance between reqUired mlmmum fimshed grade and un-treated lumber at least 8" To venfy concrete strength, a rebound hammer test was performed on the concrete by Braun- Intertech The approximate strength was determmed to be between 1900 and 2500 pSI (thiS IS after 28 days of cunng) ThiS IS less than the Code reqUired 3000 pSI, but It IS an appropnate engmeenng value for the type and dlstnbutIon of loads Smce the reqUired strength values are based on weathenng factors, and the under-strength concrete Will be protected from weather, the footings are adequate for the mtended use ~ . :\J):' .~ Steve Keatmg ! \. TRANSPORTATION CIVIL SURVEYING / . BRAUN'M INTERTEC Braun Intertec Northwest, Inc. 2280 Nugge'VVay Eugene, Oregon 97403 503746-9649 Fax 746-7163 Engineers and ScIentIsts Serving ,he BUilt and Nalura! EnVIronments June 2, 1992 Report No: E-51857 ProJect No: EBXX-92-0419 Mr. Berlane Ham1lton SX Molemen 385 N. 26th street Springfield, Oregon 97477 Project: Residential Remodel 192 Chapman Lane Spr1ngf1eld, Oregon Dear Mr. Ham1lton: SubJect: Results of rebound hammer test performed by our representat1ve on the 1n-place foot1ng concrete on the southeast and northwest corners at the above ment10ned project on June 01, 1992. Report: Rebound Tests on Hardened Concrete - ASTM C805-79 Average Converted Location Rebound PSI Northwest Footinq 1 ' west of rear entrance 22.4 1900 6' west of rear entrance 25.1 2300 10' west & 4' south of rear entrance 22.9 2100 southeast Footinq 2 ' south of front entrance 24.6 2250 9' south of front entrance 25.6 2500 10 ' south & 4 ' west of front entrance 25.0 2300 It should be noted that var1at1ons can occur in rebound read1ngs due to several cond1t1ons, including, but not lim1ted to: air pockets at or near the surface; cold temperatures; rebar or large aggregate at or near the surface; actual surface conditions. Therefore, the converted p. s. i. was provided for correlat10n purposes only. Respectfully sUbmitte~_\ 1z~~f:!iu1e:, Man~~ Eugene B~~~YI