11802 EVERGREEN WAY BASE FILE Geotech Report 2018-01-02 MF Import

eail�i1d05 15:27 4257476561 �0�� , PAGE 65 • Lucfa Development, LLC August 18, 2005 JN 05233 Page q • Fill to the desired site grades severaf months prior to cor:�tructing on-grade slahs, walkways, and pavements eround the buildings. This allows the undeflying soils to undergo some consolidation under the new soil loads before final grading is � �� accomplished. � • Connect ali in-ground uGlities beneath the 11oor slabs to the ple-sirpported floors or �� grade heams. TI'iis is intended to prevent utiliNes, suCh as sewers, from bein of the floor as the unda�l g pulled out poured into the floors an gra+desbeapig toyc�a�Rmjr �e piptng. aThesspad goT these supporting eloments wlll depend on the dislance that the plpe material can span unsupported. A slgn�cant geotechnical consideration tor developmerrt of thls site Is the overly molst to wet condiGon af the silty soils and the potential for the sllNer aands tu become overly wet due to ralnfall or groundwater. Based on our observatlons, the molstune cornents of the on-slte sllt sofls ere above the optimum moisture conlent. Ther�efore, �ese sik soils wfll be unstable under vehfde traffic and wlll 6e subject to pumpin9 under equlpment and compacted fills. k may be prudent to cover these solls With a layer of grenular (ctus►�ed rock) (�� P�� mem ha�tt disturbance from vehicle and foot traffic. Due to the(r poa�compactaqllity and organlc conterit, !he on-site sply swls should not be reused as stnactural fill. Imported gr�nular Is recommended for all structurel fill on the project UUfity trench badcfill in structural ereas, such as pavements, should also :ansist of imported structura� fill. ImP�P� �mpaction of• bacldill in uG'tity trenches end around control structures Is e common reason for pavement�istress and failures. Due to the loose, near-surface soil condiUons, we recommend that asphalt paricing areas be supported on e miNmum 1-foot layer of imported granular sUuctural fill. Additional pavemerrt recommendatons are provided in the Pavemencqr�eas set�ion of this report. The erosion corn�ol measures needed during the site developmerrt will depend heavily on the weather condftions that are encountered. While site clearing will expose a latge area af bare soil, the erosion potential on the sice is relatively low due to the gentle slope ot tne ground. We anHcipate that a 'silt fence will be �ded around the downslope sldes of any deared areas. Rocked constructian access roads shoUld be extended into the site to reduce the amount of soil or mud carried off the proFerry bY tn�cks and equlpment. Wherever posslble, these roaQs should follow the alignment of pl.3nred pavemenis, and trucks should not be al�owed to drive off of the rock-covered areas. Existing catch basins (n, and tmmediately downslope of, the planned work areas shauld be protected with pre_manufadured sflt socks. Cut slopes and soll stockpiles should be covered with plastic during wet weather. Following rough grading, lt may be necessary to mulch or hydroseed bare areas thet will not be immadiately covered with landscaping or an impervtaus ' surface. AddiUonal erosion control measures may be required due to conditions encountered during construction. Geotec_�Consukant� Inc, should be allowed to review the final devolopmerrt olans to ve�Fv that the recommen�tions presertted m this o ade uately addressed In the deslgn, Such a plan review would be a ttional worlc beyond the cuRent scope o work for this stu y, and k may fnclude reyisions to our recommendations tc accommodate site, development, and geotech�ical constraints that hecome more evident du�ng ttte review process. We recommend including this repon, in its entirety, (n the project contract documents. \ GEOTECH CONSUlTM1TS, INC.