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( : ' <br /> � SFIANNON SVNILSON.INC. <br /> i <br /> RECOMMENDED MIIYIMUM DEGREE OF STRUCTURAL F�.L COMPACfION <br /> ,r , �-: , -�; <br /> , �,,, <br /> r��� ���, ;;k-, '1.tli!lWill,,.. . ,;.:;_:J' �T- <br /> "�' � '7 - ++�i <br /> �_;,:. `.: �. <br /> Proof-mlled originat ground atter stripping gp <br /> ' organics and cutting to rough gradc under <br /> � pavemnb,ballfields or other arcas where <br /> seRlements are to be minimized(upper 1 foot) <br /> .. <br /> 1 <br /> � Top 2 feet of fill of rough grade benath gs <br /> ballfields,sl,�bs or Cootings,well bac�lls, <br /> I brneath pavements,and where settleroents are <br /> i <br /> to be minimized <br /> FiII from existing gade ro within 2 feet of rough 9p <br /> gnde surface" <br /> � <br /> ' Percent of t6e Modified Procror maximum dry densiry based on ASTM: D 1557-7Q <br /> Method C or D. ' <br /> •• Settlertxnt of backfill wmpacted to 90%is estimated to be approximately one percrnt <br /> oCthe thickness oCtt�e backfill. <br /> IIn general,the thiclmess of soil layers before compaction should not execed 10 inches for heavy <br /> equipment compactots and 6 inches for hand-operated mechanical compactocs. Backfill <br /> j compa;.tion behind retaining wal(s should be performed usiug hand compactors. <br /> 4.3 Wet Weafher Earthwork <br /> ' If the pr�ject is constn�cted during wet season(generally from about October through May)or <br /> Iduring periods of wet weather, additional considerations should be taken into account for <br /> construction. Most of the existing site soils contain sufficient fines to ptoduce a cohesive <br /> mixture when wet. Such soils aze highly susceptible to changes in water content and become <br /> � soft and difficult to handle when wet. Proof-rolling and compaction may be impossible when the <br /> moisture content of these soils exceeds the optimum. The following recommendations are <br /> � applicable if wet weather is encountered and earthwork must be continued: <br /> � ► Earthwork should be accomplished in small sections to minimize exposure to we: <br /> ; weather. Excavation or the removal of unsuitable soil should be follawed immediately <br /> by the placement and cnmpaction of a�uitable thickness(generally 8 inches or more)of <br /> clean structural fill. The size of construction equipment may have to be limited to <br /> � prevent soil disturbance. In some instances, it may be necessary to excavate soils with a <br /> backhoe,Gradall,or equivalrnt to minimize s4bgrade disturbance. <br /> i <br /> � <br /> W8628-0I.rydwp/sjm W8628-01 /"�� <br /> � 5 J� <br />