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68/18/2005 15:27 4257478561 GEOTECH PAGE 11 <br /> Lucia Dewelopment tLC JN p5233 <br /> August 18,2005 Page 10 <br /> Caeoteeh Conaultsnta, Inc., aRer dte aHe ia etripped and cut to grede. Rewmmendations for the <br /> compadbn ot structural flll beneath pavemenM are given in the sectlon entitled Oeaera/ <br /> Eaifhwork snd SWctura! Fi11. The perfortnance of site pavements ie diroctly rclated to the <br /> strength and stabilfty ot the underlyiny eubgrade. <br /> The pavement for lightly loaded traMic and parkiny areaa should conslsl of 2 Inehes of asohalt <br /> concrete(AC) over 4 inches of ctushed rock base(CRB)or 3 inches of asphalt-trasted base (ATB). <br /> We recommend prnviding heavily loaded areas wRh 3 inches of AC over 6 Inehes ot CR8 or 4 <br /> inchas of ATB. Heawly loaded arcas are typically main driveways, dumpster sites, or areas wNh <br /> fruck traffle. Inueased maintenance and more frequent �epairs should be expaded if thinner <br /> pavement sections rre used. <br /> Water irom plarrter areas and othe� sources ahould not be allowed to Infiltrete Jrrto tlie pavement <br /> sutgrede. The pavemant secdion recommendations and guidelines preaented in thla report are <br /> b�sed on our expetience in!he �rea and on what h�baen suexasful In slmila�situations. Ps wkh <br /> any pavemuMs, some malrAQnance and repair of limitad aroas can be e�q�eded as the paveme� <br /> ages. Cracks in the pavement shoWd be se�led ae soon as possible after they beeome evideM, in <br /> order to reduce the poterriial for degradatlon ot the subgrade from I�filhation of suAace water. For <br /> the sune reaaon, k ls also prudent to aeal the surfdce of the pavemeM after it has been in use for <br /> several years. To provide tor a deslgn without the need for arry maintenance or repair would be <br /> unewnomical. <br /> QENERAL EAR7FANORK AND STRflGTURAL FlLL <br /> M building and pavemeM areas should be atripped of swface vegetaflon, topsoil, otganic soil, and <br /> other deleterious material. It is importaM that exlsting foundations be removed before Site <br /> development. The stripped or femoved matetials should no! be mixad with any materials to be <br /> used as struchrtal flll, but they could be'used in non-structural areds, Such as landscape beds. <br /> Structural fill is defined as any fill, induding uh'lityr baddill, plaeed under, or dose to, a building, <br /> behlnd pertnaner�S ratainir�g or foundation walls, or in other areas where the underlying soil needs <br /> to suppoR loads. All atructural fill should be placed in horizomal lifts with a moisture corKent at, or <br /> near, tha optimum moisturo content. The optimum moisture wntent is that moisture content that <br /> resuRs in the greatest compacted dry density. The molature content of fill is very importaM and <br /> must be dosely controlled during the tilling and compaction process. <br /> The allowa6le thickness of the fill lift will depend on the material type selected, the compaedon <br /> equipmerrt used, and the number of paases made to compact the lift. The loose lift thickness <br /> shoufd not axeeed 12 inches. We recommend testing the fill as it is placed. If the fill is not <br /> sul�idenUy eompaCted, it pn be recompaCted before another lift is placed. This eliminates the <br /> need to remove the fill to aehieve the required compaetion. The following table presents <br /> recommended relative wmpactions for structural fill: <br /> GEOTECH CONSUL fAN75,INC. <br />