400 SIEVERS-DUECY BLVD 2016-01-01 MF Import

i . , ; � si-uwwoN svH�soni.iric. ► Fill material should consist of clean, gianular soil, of which not more than 5 pencent by dry weight passes the No.200 mesh sieve,based on wet sieving the fraction passing the I 3/4-inch sieve. The fines should be non-plasdc. � ► The ground surface in the constmction area should be sloped, if possible,to promote the � rapid run-off of precipitation and to prevrnt ponding of water. I ► No soii should be left uncompacted and exposed to moistune. A smooth-drum vibratory � roller, or equivalent, should be used to seal the ground surface. Should soila become too wet for compaction,they should be removed and replaced with clean atructural fill I material. ► Excavation and placement of structural fill material should!k observed on a full-dme I basis by a geotechnical engineer experienced in eazthwork,to Qetemtine that all work is � being accomplished in accordance with the project specifications. The above recommendations for wet weather earthwork should be inco�porated into the contract I �peci6cations. , 4.4 EsNm�ted Settlements and MonitoHng I Based on the results of GeoEnginears subsurface ezplorations and the proposed depth of fitl to Ibe placed over the northem portion of the site, we estimate that ground surface settlements of 3 to 6 inches could occur where tbe fill is thickest. 1'he magnitude of senlement will dei.i:cease ! proportionally as the height of fill decceases. Because the on-site soils are primarily granulaz and have received some, albe,it minimal, compaction during placement, it is our opinion that the imajority of settlements resulting from placment of new fill will occur nearly simultaneously with fill placement. � We recommend that the above-estimated magnitude and rate of settlemrnt be munitored during fill placement and for a period thereafter to confirm that the majority of settlements have � occurred prior to final gading and placement of ballfield surfaces. Monitoring should be accomplished with a series of settlement platfotms placed prior to initial filling. A double pipe � system consisting of an ouuide casing and inside riser is recommended to rolieve downdrag � stresses that may develop on the outside.;asing as the surrounding fill settles durinc?compaction. � A typical settlement platfo:m detail is presented on Figure 5. We recommend that settlement platforms be located approximately on 1G0 foot cente�s,with at � least four platfotms located within the thickest fill areas along the north side of the site. Platforms should be read by a licensed surveyoc prior to fill placement and after each 2-foat thick l WA62R-0I.ryVwp/sjm W8628-61 I 6 �