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Home My WebLink AboutPermit Field Test & Inspection Report 2004-9-20 , . . I ~~S.p-20-2004 ~2:S1pm Frcm-~ & A Enllneerlnl. Inc a .ngln'erlng September 21, 2004 Hayden Homes 2464 SW Glacier Place. Suite 110 Redmond, OR gn56 Subject: Quality assurance. house foundation pad construotion Jasper Meadows SubdMsion - 2nd AddlUon Springfield, Oregon \-\ci)lt 'lmtz: +541-884-9359 T-7S5 P 002/00T F-952 K I A Engineering, Inc. P.O. B0I28624, Eugene, OR 17402 521 Me. St., Salile 8, Eugene, OR 17402 (&41) 184481 Voice (641) 1184-8368 FAX PmjecI: 74.04 PURPOSE AND SCOPE AsI'8QU88led. K & A Engineering. Inc. has oompletBCI monftorlng the constructron of Individual foundation pads at the subJect new residant/al SUfKfMsIon. 39 individual foundation pads were constructed at the slle and prepared ready tor funning new foundaUons. Prior to construotion. a G8OteChnlcallnverigation1 was made of the subdivision to develop specific tBCommsndattons for developing tile site for residential foun~attons,~. and utIUtI8s. The purpose of our serviCes was to provide monttor construction of foundation padS to as&UrB that conatruotion ct1terla outlined In the geotschnlcallnvestlgation was addresaed. . '"* I1port documents foundatlon pad construction and makes recommendations for suitability for residential foundation CvllollL don. fOUNDAnON PAD EXCAVAnON Gillem The foundation pads devefoped for this proJect an: to support conventionally framed residential 8tnlctut88 supported by conventional cast-in-place concrete spmad footings. Due to the slope lJI' tI18 SIt8 most of tJ1e foundation pads were constructed In two or moro benohes. separated In grade by approximately 1 to 2.f8Gt. fGUndIdon Saile l11e Geotectmtcaf lnv88tlQaUon (BoIre) had predicted that high ptasticlty silts or clays would underlie the site. Excavatlon for the pada eonflrmed that In most of the foundatlDn pads, 1here was 1 to 3-feet of a gray, highly plutlc, rnodllrafBly atlff. and moist silt. In some locations the gray silt contained a slgnlflcant amount of sub- rounded Igneous cobbte$. ThIs si~ was orten covered by O.&.to 1.0-1eet of damp, very low~nslty peaty siltS. Weathered yellow-tan tuffaceous siltstone or sandstone was encountered underneath the plastic silts. 1 BOiRl ~Jates, Inc., Geotechnical Inv8sllgallon for the Jasper Meadows S8GOIId Addition, Sprtngneld, Oragon. Ftbruary 16, 2003. 8 'd G8L9'oN S3~OH N30AVH ~dH:G 900G 'g 'uer ,:: "'/ . . . ( ~~S8P-20-2004 02:31pm From-K & A En,lneerln.. Inc +S41-SB4-ms T-T35 P 009/007 F-9S2 ::;; K & A EIIafneerlna, Inc. The gray pJastic sJItB and gray plastic 81118 with oobbles were deepest through the western portion 01 the subdivision. Isolat8d zones of gmy plaslfc silt Dr plastic silt with cobbles WlIl1 also encountered throughout the centJal and eastern portions or the 3ubdlvlslon. FaundlliaB hd Gonllnlclfon Because the depth and extent of 80US vaned ~Ignnicantly across the subdlvllJlQn, ~aoh pad was evaluated IndlYlduaOy to d8I8rmIne the proper delrth of excavation and tile amount 01 select fill to be placed in the excavation. For many (If till: foundation pads. the depth to weathered slRstone or sandstone was less than 2..feet and, In these cases, the foundation pads wers excavated to bedlOCk, and gf'ldad smooth, Jevel, and free from lOose materfals. In ~ cas8$ the base or the excavation was in two bBllCh88 separated in grade from 1 to :!.feet Select aranular fill \VIS placed In the prepared excavation and brought to footing grade. In those at!aS of deeper gray plastic sOl, the silts were removed to a minimum depth of 1 &-inchos below fooUno grade. The battnma of the excavations were graded Smooth, level, and free from loose matflrlals. In most cases the base of tho excavation was In two benches sepalUted In grade tom 1 to 2-f8et. Select granurar no was placed in the preparod axcavatlon and brD\lOht to footing grade. In all cases whefl peaty slits were encountered. the peaty-suts were completely removad frOm the foundallon 1U98. S_I Gl'IIIUlar Fills Se/ect oranular fills consisted of a sub-base matertaI and a DaS8 material. The sub-obue material was plaoed on the prepared subgrade in the foundatlon pads and conllfstad 01' a S-Inch mInUs waU.gradBd quany 199ragata. 'The base matet1a1 was placed over the sub-~ase rock and consl8t8d of a1 *Inch minus denae..gl'8.ded qlJ8r1j' aggregate. Both aggregates were produced at the Morse Bros. Quany In Sprlngf1etd. ll1a sub-basG thl0kn8ss generally ranged 1rom 6 to 12-inches. Base rock ranged from 4 to 12-inches In 1hIckne88, In a fvw aU8S (Iot8 33 throUgh 39) tf1e sub-base rock was eliminated and base rock was used exclusively for1he aslect granular flU. The select granular fills were well compacted in 12-inch maximum lifts (loose) using a steel-Whe8led vibratory roller. Water was applied as necBSSary to maintain optlmum water content during compaction. Denllly at 8c1ec1 Immlat filla SUb-base The denstly of the sub-base was evaluatBd by InSpection Of placement methods and. tteld evaluaUon of water content. The dsnsKy was considered IdaquatG It passes by the larga vibratory staeklrum roller did not 18m visible markS In the sub-base aggregate at the edges of the drum and if the 80~ water cont8nt appeared to be near optimum as determined In the field.' 2 Squeezing a small amount of Ita liner aaareaat8 in tfIe hand did oot produce significant free water and WOUld remain In a relatiYely uniform ball without immediately tailing apart. Project 74.04 Jasper Meadows Subdivision Phase II, Sprtngfield, OR Client Hayden Homes Page2of3 september 201 2004 V 'd Z8L9'oN S3~OH N30AVH ~dgv:Z 900Z'g 'uer