1202 SHUKSAN WAY 2018-01-01 MF Import

� . � till can usualh• hc placcd as stnutur:d fill, providcJ that nn c�tcndcd periods of��ci ��c;itlicr uccur � during this timc. i I If earthwork will he undcnaken during the latc fall to spring, ��c �ug�esl that a contingency hc included in the pmject schedule and budgct to account for increased canh�vork cosis. In addilion, if i � construction is planned in the�vimer months,thc usc of till soils as backfill may �,�� n� i,�ts�ni�� to the moisturc sensitivih�that it exhibits. Eristing lill fill remo��ed from the trcnch c�cavations or � from site cuts is also likcly to bc weI of optimum and dit'ficult lo reuse as ircnch hackfill ��i�hout f 1 bcing acrated. Tlicrefore, imporled sand and gra��cl matcrials should be planned for trauh hack(ill � in wet wcathcr conditions. During ��et wcathcr construction, access mads rnnsisting of crushcd rock or pit run sand and � � gra��el may 6e neccssary to operate equipment on the csisting fill. A constructirni geotestilc, such � as Mirafi SODX, should also be considered below granular access roads. Al�cmatively, if tlic sitc is f graded during thc dry scason, it may be prudent to protcct the sub�Tade using ATE3 ir. arcas whcrc Iconstruction trafTic��ill be routed in the wet weatlier months. 1 4.2.2 Site Clearing � Because the area of tiie proposed JanSport Building and surrounding pavcment arcas arc all � �eithin recent fill areas, no significant clearing or s;rippine will be necessary. We recotnmend stripping and removing the vegMation from the drainage ditches. \1'e also rccrnnmcnd draining all the ponded��ater from the drainage ditches and the stormwater pond in the southwest portion of the � site prior to preparing ilie subgrade for additional fill. I 4.2.3 Subgrade Preparation � All ponded water should be mmoved from the drainacc di�ches. �1'et soils should also be dried I or removed from the ditches. All loose soils should also be exca�ated Gom the ditchcs unless � su�ciendy dry to allow for proper compaction. Once the ��ater and loose soils are removed from � the ditches,the exposed subgrade should be evaluated by proof-rolling or by using:.steel probe rod, I prior to compacting or placing sWctural fill in the ditches. The loose and disturbed fill soil observed in the south��est portion of the site under the building footprint should be rcmoved to dense pit sand material. All wet soils should also be removed. The ( eacavation should eatend beyond thc huilding footprint a distance equal to t!ie e�cavation depth. I We anticipate that about 6 feet of loose and wet soils exist in this area. The area is behveen about ' gridlines A to C and 1 to 5.5. I i IPrior to placing new fill, pavement or slab support materials, the c�posed subgrade across the � site should be evaluated by proof-rolling using a piece of heary tirc-mounted equipment or a loaded + dump wck. Afier proofrolling, the subgrade arca should be thoroughly compacted to a firm and � unyielding condition. If the subgrade can not be compacted to a firtn and unyielding condition, it is likely that the soils remain wet at depth. If this is the case, the material sho�ld be allowed to dry I sufficiently to be properly compacted. � C � G e o E n g i n e e r 5 8 File No. 75d4-W2•00•I 130�J50101 ��