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� <br /> � ProvisionsEoc drainage should be provided behind belov-grade valls. We recom- <br /> mend [haC che zone of backfill against the vall consist of 18 inches of clean <br /> � frcr-�raining sand and gravel mee[ing the grading requirements presen[ed in <br /> Table 3. In addition, perfora[ed drainpipe having a minimum diameter of 4 <br /> � inches should te embedded within the free-draining ma[erial a[ [iie base of <br /> the wall along i[s en[ire length. This drainpipe shou.d dlscharge in[o tigh[- <br /> ]ines leading [o appropria[e collection and disposa]. sys[ems. <br /> IRoof drains should be connected to tigh[line sys[em: which are not inter- <br /> coniected vith the subgrade wall drains. The ground surface adjacent [o the <br /> IneW building should be sloped so that surface runoff flovs avay from the <br /> s[ructure. <br /> I Latecal Resistance: The soil resistance avallable to resist lateral <br /> foundati�n Loads is a function of the frictional resis[ance vhich may develop <br /> I along the base and the passive resistance which may develop as the below-grade <br /> elements of the structure tend [o move into the soil. For fo��[i��igs Euunded <br /> on na[ive soils or on structural f.i7.1 placed in accordar.ce witl� our. recommenda- <br /> Itions, [he allowable frictional resistance may be compu[ed using a coefficient <br /> oE friction of 0.35 applied to ver[ical dead-Load Eorces. The allowable pas- <br /> Isive resistance on the face of the fuo[ings, grade bea:us or othec embedded <br /> founda[ion elemen[s may bz compu[ed using an equivalent fluid densi[y oE Z�0 <br /> I pounds per cubic foot for a Level backfill surface. The �bove coefficien[ of <br /> friction and passive equtval.ent fluid density values both include a factor of <br /> safetv of abou[ 1 .5. <br /> PAVEMENTS <br /> The iiative glacial ti11. depusits at [ne projec[ site drain poorly and <br /> i are moderately suscep[ible to Lrost heaving. For Long-term staUili[y of <br /> pavements, it is important [hat the base course and surfacing be underlain by <br /> a :ayer of free-draining sand and gravel. This sand and gravel layer will <br /> � <br /> provide drainage at [he Uase of the pavement section and ac[ as a capillary <br /> I break. <br /> � Our recor.�mended design pavemen[ sections assume [ha[ the subgrade areas <br /> will be prepared as recommer,ded above under SITE PREPARATIUN .1ND �:�1RTfiWORK. <br /> A California Bearing Ratio (Cl1R) value of 10 has been used [o describe the <br /> pavemen[ suppnr[ condition at the surface of the subgrade. We recommend <br /> �5 <br /> - l2 - <br /> GeoEnginea�rs <br /> I Incorporafed <br />