5300 GLENWOOD AVE 2018-01-02 MF Import

Glenwood Terrace File Numbcr 12G994 May 12, 1994 Page 10 Site Preparation and Ceneral EarthN•ork Silc prcparnlion and grading will consist of stripping the upper lopsoil and organic ladcn soils, and foating cxcavations inro the nativc soils where fill is not encountcrcd. IF Uu site is workcd during wet conditions, additionul stripping depth may bc rcquired, as lhe upper topsoiUFill has a higher silt content. Adual meU�ods ��d teclu�iques for pcdortning site work should be detemiined bascd on conditions obscrved in the ficld nt thc time thnt the c�rthwork is accomplished. Most of the ridge(cut slope area)consists of ouhvash. "17ic ouhvash, tt�at underlies the site and appears to make up most oF die ridge, is only slightly moisNre sensitive nnd is considered a good source of structural fill. Erosion polential for areas in �chich thc cxisting low ground cover is IeR intact, and surfacc watcr is controlled, is expectcd to be unafTected by the proposcd developmeut. Construction phase crosion control could include, but not necessarily be limited to, the use of haybales, gcotextilc barricrs (sill fcnces) and controlle�i surf.�ce grading. Covering of fill embaiilcments and storage piles with pl.�stic sLeeting for temporary erosion wntrol,may also be requirod during periods of�vct weathcr. Rcmoval ttnd replacement of the unsuitablc soils is nomtally recommend�d to achieve dia most dcsirablc subgradc conditions in the fill areas. Based on thc wnditions obscrvcd in our explorations, most of the road«ay alignment and rtiany of lhe building locations will be above a dcep layer of fill. Where fill is rcmoved in building and pavemcnt arc�s, it should bc rcplaced widi structurnl fill as dcscribcd in thc Structural Fill subsection bclow. Where fill is nol removed, settlement should be expecled. We expect over time Uiat U�e variably U�ick fill �vill settle a couple to several inches,deprnding upon lhe thickness and composition of the fill. 'Ihis settlement would be most obvious around structures faunded on piers/piles :md near arc•.�s rcplattYl by structural fill. Road�vays on the fill could be improvc�d wid�out removing all oF the fill. This tectuiique usually wnsists of excavation to 3 to 4 fect belo�v Uic subgmde v�d compncting tlie newly exposed ground to a unifomi state. The excavation should be wider than Uu planned improvcmcnts. The structural fill would then be placed ns described bclow to bring Uic road to gradc. Tlic fill sl�ould be placed �rith a II�:1V slopc from thc pavement or sidc��alk cdge do��n to the cxcavation depth. Arcas observed lo pump and«�eave may require additional ovcrexcavation. Tl�is mcdiod reduccs settlement potcntial and provides a stable subgrade for pavcmcnt support. Aldiough future settlemcnts could occur, lhis method helps to sprc2d out "local' setdements such tliat tliey aro not u abrupt or npparenl. 'Il�is setdement should not impact pavement perfonn.lnce but could efTect surface drainagc. \Vc rewmmend thnt if this metliod is uscd, thnt surfacc grndcs bc �cttntuatcd :utd incrc:tscd gradicnts bc uscd on gnvity utilitics. NEI.SON-COUVRETTE& ASSOCIF.TES INC. FL=I�-23-199E 1:'�E�C, 7_06 491 2510 96i ' � P. 12