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1 <br /> Glcnwood Tcrrace <br /> Filc Numbcr 12b994 <br /> May 12. 1994 <br /> Pagc lR <br /> minimum diameter of 4 inches should be em6cddcd µithin the granulnr matcrial at thc basc of the wnll <br /> along its entirc Icngth. 'Ihis drein pipe should discharge inlo tight lincs Icading to appropriatc collection <br /> a��d disposal systems. <br /> Slab-on-Grade <br /> Slabs could bc supported on subgrade soils prepared as outlined in die Sile Preparation and CradinY <br /> subsection of this rcport. We recommend that ihe slabs be founded on a minimum of 2 f�t of structural <br /> fill, if they are to be pinced abovc thc existing fill. So:ne risk of settlement ancVor cracking should be <br /> expected of any slab placed above Uic cxisting fill. We recommcnd in fill areas that slabs within the living <br /> portion of tlie buildings only bc supported on pilcs and this q�pe of support sliould nt Icast bc considered for <br /> all slabs. Were slabs are plaaxl abovc the existing fil: without piling, tluy should bc rcinforccd to <br /> «ithstand some diflercntial sctUcmcnt. A gap should be provided betwan !he slab and adjaccnt foundation <br /> wall so that the slab can settle withoul being hung up causing a bridging condition. This is conunonly donc <br /> by placing a fdt expansion strip bchveen the slab and foundalion wall. All slab areas should bc prooholled <br /> �viW a heavy rubbcr-tircd piece of equipmenl lo identify sofl or yiclding areas that require repair. The <br /> prooGolling sl�ould be accomplishcd prior to placcment of the capillary break material. Additional slope <br /> should 6e provided to the garage floor slabs not on piling lo account for undesircd localizecl selticments. <br /> M altemative in gange arcas is to use asphalt instead of concrote. "Ilie asphalt c;u� tolerate much higl�er <br /> di(Tcrenlial scltlements wit6 Icss distress than concrcte dces. <br /> Wc rcconuncnd diat all floor slabs where moisture control is important be undcrlain by 6 inches of free <br /> draining sand or gravel for use as a capillory break. A suitable vapor bamer such as heavy plastic sheeting <br /> sliould be placed over Ilie sand or gravel. Tlic capillary break should be dcsigned to drain into the <br /> foundation dnin systcm. <br /> Pavements <br /> Roadway subgradc prcparation, dninagc, nnd structural filling �+�herc requircd, should be perf'ormed as <br /> rccommendccl in tliis rcport. 71ic subgrnde should be prooCrollcd ��illi a hcavy rubber-tired piece of <br /> equipment to identify soft or yielding areas that ra�uirc rcpair. Wc should be retained to obscrvc the <br /> proofrolling and reconnnenJ rcpairs prior to placcmcnt of tlic :uphalt or hard surfaces. A stanJard <br /> pavmncnt design bascd on cxpected tiaETic loads should be used. We recommend a 6 inch laycr of frce <br /> draining pi� nm be placed under the pavement section ro reduce Uie etTccts of&ost hcave. <br /> NELSON-COUVRETTE 6 ASSOCIATES, INC. <br /> �ER-?3-199F 1;?: 1?_ 7_(J6 481 2510 96i P.20 <br />