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Home My WebLink AboutPermit Field Test & Inspection Report 2001-10-23 ~ & ASSOCIATES, 541 saa aoa7, J.I~BB1 16:31 FROM. FOUNDATION ENGINEER 5417S7765a - 1/- ~ If ., I ~. OCT-23-01 9 11AM, TO. 541 688 8007 PAGE 2/4 P 1302 r I2l1ia4 Foundation- Engineering, Inc. p)'r'Jjr1nrorral Gemt'c1vfrcal SenJ/U\ -'AO ~ ~ ~.... oft ~A (t~ ~ ~ ~ Clint Beecroft E~R and Associates 25358 Prame Road Eugene, Oregon 91402 October 22, 2001 ~bl~~ \?~~ Project 2011 D55. 'kA ~\ d , 'b~ \kl At your reqtJest. we have completed the constru.ctJon observation and consultation during earthwork for residential Ibts Wrt:hlll the Levi Landing - 2M Addition development tn Spnngfield, Oregon. This letter summarizes our observations during the earthwork Levi landing - 2nd Addition Earthwork for Residential Lot Construction Springfield,. Oregon Dear Mr Beecroft: BACKGROUND Foundatlon Engineering, Ine. (FEI) conclucted a geotechnical InvestIgation of the site and presented our findings in a letter report dated August 31, 2000. Levi Landing 2nQ AdditIon includes Lots 34 through 113 and ~s located north of Thurston Read General recommendations for site preparation and fill placement and compadlon were included In the ,report. FEI was retaIned ~y E,GR and AssocIates (the ciVIl designer) to provide geatechmca~ engineering consultation during the earthwork. FEI Testing and Inspectlon, Inc. was also retained by EGR and ASSOCiates to conduet field and matenals testing se"';ge5. LABORATORY AND FIE~D TeSTING Laboratory end field testtng assoclated with the lot fills was completed by FEI Testing and Inspection, Inc. The Jaboratory work Included mOisture-density curves for the matenais from the cut areas that were used as fill. On..slte borrow soils used In the site grading typically Included ~iJt to sandy silt. Bar-run gravels excavated from trenches were afso u~ed In site grading. Several mOisture density relationships for the an-stta silt were conducted as the earthworl( progressed, Moisture denSity testing on the slit solis su~gests the maxImum dry denSity ranges from 91 5 pet at an optImum moisture content of 22.6% to 96 1 pet at an optimum moisture content of 24 3% Several check pOInts were also conducted, with result within this range Field densrty testing was conducted on individual lifts of flll and the prepare~ subgrade d~rlng rough site grading. ' , l'onll1nd . Corvlll"~ 8211 NW C~II"c!ll ^venue' Carv:!lIrq On:g.,n 97330-4;17' Bu~ (541) 757.7645' fall. (54!) 7~1.76~O --... ---.... J V,",J-"'~-UI ~ 11AM, , I ,-2001 16: 31 FROM FCUNDATION ENGINEER 5417577658 TO.54! 688 se87 , I " , , 7 ~. ; ;j ! CONSTRucnONOBSERVAnONS , Fill Placement and ComDac6o" The exrstrng ground surface was prepared by strlpplng the surfictal organics to a depth of :!:2 to 4 inches and placing the stnpplngs in the back of the lots We IndIcated that this would be adequate fer stripping In areas of deeper filts (>2 feet). However, some roots remamed In the exposed subgrade due to the orch~rds that pr8viou~Iy occupred the site Therefore, we. recommended additional stnpplng 11:'1 areas of shaJrower fills. The subgrade was prepared by npplng me soH to a dspt/1 of :1:12 Inches, and compac:tlng the surface, Fle1d density testing In sEWeral areas indicated that Inltlal compaction efforts were not adequate. These areas were typlca"y reworked by ripPIng the surface again, mOisture conditionIng the soil and reccmpadlng with several passes of .a pad foot roller. The prepared slJbgrade was then erther retested or evaluated by proof roiling WIth a loaded 12 CUbIC yard dump truck, PeriodiC field density testmg, proof~rolllng and observation of fill p1acament and compactiOn methods welli q:mducted 'tnroughout site grading We proVIded recommendatIons regarding moisture ~ndibonJng of the fill and removal of organic mater1a~ thro\.Jghout fill placement Our observatIons and recommendations were summanzed in a series of field notes 8S the WOrk progmssed lot fills were construded ~Ing on-sIte soils placed ana compacted In :t12 Inch (loose) 'lftS FIlls were compacted With multJple passes of s pad foot roller. Periodic field density tesflng and proof-rolling using a loaded dump tnJck Were conducted on the compaeted fill Areas that did not Inrtlally meat the SpeCified compaction were s.carified andlor moisture condlboned 'and recompacted A final review of sIte condltiQrJ.$ and field density tests at the flnls~ grade of the lots W~re conducted on Octo tier 15, 2001 ' We noted ,,., sav.eral areas that final lot grading results in a tow area near the mnjdle or front of the lot. We antICipate that the predominately SIlty sells used dufing the site work wfJI be moIsture sensrtive and WIN soften with exposure to wet weather condltfons. 'Therefore, 1he fill will have to be evaluated at the time of foundation construction to determine the Impact of wet weather CQnd/tJons and appmpnate mitigatIon measures. CONCLUSIONS We have- concluded, based on the results 01 our cpnstruction obselV!trons and the' field and laboratory testing conducted, tf1at the fill mtended to support house foundations meets the requirements of use Appendix 33, Section 3313 Therefore, the 101s are approved for residential construcbon proVIded that any soft or disturbed materfals ~t the- surface are rem()~d prior to footing construction Thrs approval presumes that foundation construction on these lots will be completed pnor to wet weather The surface of the "" vv/J1 likely S"often when wet and sho\J1cf be re-evaluatecJ Immediately pner to constructIon for fOundation construdion delayerj. beyond the end of thIS fall ' , ley! lBndlr'lg. -:t" Mdlll<<r Earmworll far Rlillllda""a' LotCClnmvCllon Spdng1leld, Oregon 2 Odctler 22, 2001 ~'11""'~ EGR Gmd Assoda_. 1m:: PAGE 3/4 P 003'a0Q JR & ASSOCIATES, 541 J I - -, ~""" ,...." I .l.U,'1 ~l:Il~l::f<' 11 .r:1 f"', " ../, I I / I ' saa aoa?, S.q17S776S0 OCT-23-01 9 12AM, TO 541 688 8B87 PAGE 4/4 P 12113<1/004 T,he impact of wet weather condItions /s likely to vary with loearlon and prpposed c~nstl1Jctfon techniques Therefore, IndIvidual lots wi/{ need to be evaluated at the;! tlm~ of foundation construdlon The im-slte flU materIals are mOisture sensItive, therefore, reworkmQ these materialS dUrJng wet weather condItions wil' not be.practical. In addlllon, foundation preparation work may reqlJi~ specl~' measures durfng Wet weafher to mfnimlle dIstUrbance to the compacted fin metana's It has been a pleasure assisting you with this phase of your project Pfesse do not hesrtats to ~alllf you have any questions or If we can be of ~rther assistance, SIncerely, FOUNDATION ENGlNEERrNG.INC 71tIJ1;t,L Mel McCracken, P E- Project Engineer MJM ~ lsndlnq - 2'" A\ddJII~" eai1tTMl~ ror ~1l1e/'lhlll Lot CQnatrlJe1fen S"c1"~"eld Ottlgcn 3 Oelober 22 2001 Pmlect. 201 10[j~ EGR anti ASllOcllllef; 'na