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IGenlcrlinicu!fn}�i�iccri�{q R porl J � Jtu�e?. ?009 <br /> Cnin�uuni(r Hcaldi Cen�cr. Ercrc(G If:-0 Projecf#?009-IJa <br /> I <br /> passing the No. 200 sieve. l'his material �vill reduce the potential for up�vard capillary <br /> Imovcment of water through the underlying soil and subsequent ���etting of thc Floor slab. <br /> Where moisWre by vapor Vansmission is undesirable, an 8 to 10-mil thick plastic <br /> I membrane should bc placed on a �-inch thick layer of capillary brcak. The membrane <br /> � should be covcrcd with 1 to 2 inches of cican, moist sand to guard against damage during <br /> construction and to aid in curing of thc concrctc. <br /> �or the anticipalcd flnor slab loading, we estimate post-construction Iloor settlements of <br /> '/.- to %z-inch. <br /> d.5 Drainaec <br /> Surfncc <br /> I �inal c�tcrior brades should promotc Ircc and positi��c druin�gc away fiom building. R'atcr <br /> must not pond or collcct adjaccut to 1'owidations or within thc immediatc building arca. Wc <br /> rccommend providing a minimum drainage gradient of 3% t"or a minimum distance of 10 <br /> IIcet liam lhe building perimeter, exccpt in paved locntions. In paved locations, a minimum <br /> gradicnt of 1% shoidd be provided unless provisions are includeS for collcction and <br /> � disposal of surlacc ���atcr adjacent to thc structurc. <br /> Subs►�rfnce <br /> Wc rccommend installing perimctcr tinmdation drains. A typical rccommended drain delail <br /> I is shown on �igurc 3. 'fhc foundation drains and roof downspouts should bc tighUincd <br /> � separatcly to an approved discharge ficility. Subsurface drains nmst bc laid �vith a gradicnt <br /> I sul7icicnt to promotc positivc Ilow lo a controllcd point of approvcd dischargc. <br /> d.6 Utilitics <br /> ( Utility pipes should be bedded and Uackfillcd in accordance with American Public Works <br /> Association (r1PWA) specilications. �or si4: utilitics locatcd within lhc City of Gvcrett <br /> right-ot=ways, bcdding and backtill �he��!,1 bc complctcd in accordancc �vith City of <br /> Lverctt specifications. The trench backlill should be placed and compacted as stnictural <br /> lill, as dcscribcd in the Site Preparation and Grading scction. <br /> Wherc utilitics occur bclow unimproved arcas, the dcgree of compaction can bc reduccd to <br /> a mininuun of 90 perccnt o(tlic soil's maximum dcnsity as dctcrmined 'oy thc rcfcrcnccd <br /> ASTM standard. r�s notcd, soils cscavatcd on-site will gcncrally be suitable Cor use as <br /> Ibacklill material if soil's moislure can be properly controlled. <br /> � <br /> �1.7 Yavcments <br /> Pavement subgrade shuuld be prepared as described in Aie Site Preparation and Grading <br /> scction of ihis report and as discussc�l below. Regardless of the relative compaction <br /> I achievcd, the subgrade must be tirm and relntively unyielding beforc paving. This <br /> condition should be verilied by proof=rolling witli constniction equipment or hand probe <br /> by inspector. <br /> IThe Riley Giroup, Inc. � <br /> I � <br />