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1 <br /> Subswface Ecpforarian, Geologlc Hazard, and <br /> � Nouring Nopr Pharr!! Preliminary Gcotechniraf Engineertng Report <br /> Eti•rrm, �khrhingron Dcslgn R�cammendatioru <br /> � �CCCCSSIO[L1I OUIR'ySll� IS CI�SSIf1Cl� 3S "Sand" with a potential percolation rate of less than 10 <br /> minutes per inch. If infiltration is considered, we recommend furtlier subsurfacc exploration <br /> w•ithin the specific targeted infiltration areas. This would be b..st accomplished by borings <br /> I �ti�ithin tha area targeteci for infilvation depending on the testing procedure chosen to evaluate <br /> infiltration rates at design infiltration elevations. The City of Everett will require textural <br /> characterization of soils at specific infiltration elevations at a minimum, it may a(so be <br /> { desirable ro install a piezometer within the area intended for infiltration if thc storm water <br /> � disposal facilities will be designed deeper than about elevation 366 feet. We can assist <br /> � Housing fiope and the design team with development of an appropriate exploration and testing <br /> proeram, if reyuestcd. <br /> + 15.0 PAVEb1EtiT RL-COhi�IENDAT[ONS � <br /> � �Ve unde:stand that paved areas of the site wifl likely be limited ro concrete walkways and <br /> , possibly small driveway/parking areas. Site preparation for areas ro be paved should consist of <br /> overexcavating ro remove the existin; vegetation, topsoil, and the loose/soft poRion of the <br /> I upper soils to expose the underlying scable soils. Since the density of t6e upper soils is <br /> variable, random loose/soft azeas may ezist and the depth and extent of stripping can best be <br /> deterntined in the field by the geotechnical engineer. In addition, along the centerline of <br /> Ipazking azeas, the subgrade should be slighdy inverted to drain toward the catch basins. <br /> After the area to be paved is overexcavated, t6e exposed grormd should be recompacted to 95 <br /> Ipercent of ASTbi:D 1557. If required, structural fill may ti�en be placed to aehieve desired <br /> subbase grades. Upon completion of the recompaction and s[ructural fill placement, the <br /> recommended minimum pavement section is 2 inches of asphalt concrete pavement (ACP) <br /> 1 underlain by 4 inches of 1 '/.-inch crushed surfacing base course. The crushed rock course <br /> must be compacted to 95 percent of[he maximum density. <br /> 1 <br /> 16.0 REC0�1�•fENDATIONS FOR FURTHER STUDIES <br /> ( At the time of this report, site grading, building footprint final locations and finished floor <br /> elevations, storm water drainage and structural plans, and construction methods were not <br /> + finalized. Therefore, the recommendations presented herein are prcliminary. We aze available <br /> to provide additional geotechnical consultation as the project design develops and possibly <br /> changes from that upon which this report is based. We recommend that AESI perfornt a <br /> ' geotechnical review of the plans prior to final design completion. In this way, our earthwork <br /> and foundation recommendations may be properly interpreted and implemented in the design. <br /> ( Based o❑ our prelimi�ary site evaluation, we recommend the following additional work be <br /> performed at this site: <br /> � February 11, 1002 ASSOC/ATED E1R7NSClENCE$ lNC. <br /> SGlhfd.11:`.0/7�9d:�P.o�rcu!JYJI:+9UP.1WP.147K Page 16 <br /> � '�� <br />