1625 ENGLAND AVE 2016-01-01 MF Import

IGcotcchnical Gnginccring Gvaluation I G2� f:neland Avcnuc I Bvcrctt, Wasliington NGA Pilc Tlo. 781GOR Pcbruary 20,2005 1'agc 6 I �rcas should bc planted with vcgctation as soon as practical. Tlic vegetation should bc maintnined until it � is cstablished. Thc crosion potcntial of areas not stripped of vegetation should be lo�v to modcrate. Protection of thc slopc nrcas should bc performcd ns rcquireJ by the City of BvcrctL Arcas to bc modified during grnding shotdd bc re-vegetated as soon as prnctical. Specific�lly, wc rccommcnd that the sloping arcas outside thc clearing boundary not bc disturbed or modificd through placement of any fill or I rcmoval of the e�isting vcgctation. All stockpiles should be kept at least 30 fect from thc stcep slopc and should bc covcred with plastic. Vcgetation shotdd not be rcmoved from the slopcs outsidc thc clearing I boundary milcss a mitigntion plan is developed, such as thc rcplacemcnt of vcgctation for erosion protcction. Rcplaccment of vcgctation in arcas of disturbed soils should be perfonned in accordance with I lhc City's rcgulations. Undcr no circumstances should �vatcr bc allowed to (low uncontrollcd ovcr the sitc slopc, both during and aftcr construction. Lawn clippings and otlicr houschold dcbris should not bc cast ovcr thc slopc. I Sitc I'rcparation anJ Grading Inncu crosion control mcasures arc in placc, sitc prcparation should consist of stripping any topsoil, undocinnented fill,or loosc soils to csposc mcdium densc or bcttcr nativc matcrial in foundation, slab-on- grade, and pavemcnt arcas. The stripped malcrial should bc liauled ofT sitc or stockpilcd a minimum of 30 fect a�vay from site slopes. If thc csposcd subgradc appcars to be loose, it should bc compacted to a non-yiclding condition. Arcas obs-crvcd to pump or �acavc during compaction should bc reworkcd to structural lill spccilications or bc ovcr-cxca��atcd and replaccd with properly compacted structural fill or rock spalls. II' significant surf:icc walcr �ow is cncountcrcd during construction, this ilo�v should bc divcrted around arcas to be dcveloped mid the csposcd subgradc maininincd in a scmi-dry condition. Surl'acc �vatcr should also bc divcrted away from thc slccp slopc. 'I�he surficial soils encountered on this site are considercd moisturo-sensitive and will disturb casily when wcL To Icsseu thc potential impacts of construction on the slopc and ro reduce cost ovcrruns mid delays, �vc rccommend that construction takc place during e�tcndcd periods of dry wcather mid bc suspended in wct wcather. If construction takes place during wet weathcr additional c�pcnscs and delays shotdd be c�pccted. Additional c�penses could include additional crosion control mtd tcmporaq�drainage mcasures to protect thc slope, placcmcnt of a blankct of mck spalls to protcct c�poscd subgndes, and thc nced for importim,nll-��ralhcr ma�crials lor structural lill. I NELSON GEOTECNN/CAL ASSOC/ATES, /NC. I �tiU