2408 RAVENNA ST 2016-01-01 MF Import

� C C / Geoteclwical Engineeting Report Lowell Shon Plat June 2, 1999 NCA File No. 259499 Page 7 rolative compection. The ureas to*�ceive fitl should be prcpared a=owlined in the 5ite Prop�ratlon and Gradieg subsection of this roport• Mnterial.a: imported structurel fill should tonstst of a good yualiry, free-drei�in6 Branular s°i�> fiee of organlcs and other hazmful material, end be well�raded to a maximum siu of ebout 3 in�hes. imparted, sll-weather fill should mect these:equirements, and also should contain na moro d�an 5 percent fines(wil passing a U.S.I3o. 200 Sieve),based on that fraction passing the U.S.3/d-inch sieve. The on-site native soils consist of silty t'ine to medium sand and silis wi[h sand. It may be possible to use the si}ty sands as structural fill, if these soils are rolstively frae of organics, can be sepa�aud from the silts,and can be moisr�re conditianed to near optimum moishue conunt for compection. We expxt the noecssary maishue condirioning will consist of drying dte material,which would requix�e an adequate ama ' to spread the material oat. Dryin�the material may not be possible outside of the awnmer seeson• We expect that the silts would not be suitable for structural fill piacemrnt at eny rime of the year. Seperation of the soil types may be difficult due to the layering of the soils,and it is possible that none of the on-site materisl may be compactable to struehuel fill spccifications. Fill Placemeut: Following subgade preparation, placement of the'slructural fill msy proceed• A1� fill should be placed in 8-to 10-inch thick unifocm lifts. Each lift should be�sprcad evealy and be t6oroughly compacted prior to placement of subsequent lifts. All strvctural fill underlyin8 building areas, snd widtin 2 feet of pavement subgrade, should i�e compacted to at least 95 peccont of its meximum drY density. Maximum dry density, in this report, rofors to that density as deucmined by the ASTM D-1557 compaction tcst procedure. Fill morc than 2 feet beneath sidewelks end pavement subgrades should be compacted to at least of 90 perceat oY its maximum dry density. The moistuce content of the soils to be compacted should be within about 2 pereerrt of optimum, so that a readily compac�abk condition exiscs. " It may be necessary to overexcavate and mnove wot soils in et�ses W1we dtYin6 m a compactnble condidon is not feasible. All compaction should be accoznplished by equipment of a typt end six sufficieot to attain the desired degrn of compacrion. Some rolaxation of the 95 perceat compaction specification may be appropriate irt pavanent ereas whero strucnual fill is placed diteedy over existing fill. This should bn evaluated at the time of canshuction. 7� ' NELSON-COUVRETTE&ASSOC/ATES, INC.