7920 EVERGREEN WAY 2018-01-01 MF Import

GEOTECHNIGAL ENGINEEf G STUDY McDonald's Corporation August 30, 1999 E-8879 Page 2 Our borings indicate thf; site is immediately underlain by two inches of asphalt concrete and up to four inches of crushed base. The asphalt and base is underlain by dense to very dense glacial till in most areas. The till consists of silty sand with gravel (Unified Classification SM). Loose to medium dense fill soil was enccuntered in Ciorings B-5 and t3-6 from the surface to sevan and four feet below the existing grade, respectively. Groundwater Groundwater seepage was observed at six to twelve feet below grade during the subsurface exploration. The groundwater seepage levels are not static; thus one may expect fluctuations in the level and volume depending on the season, amount of rainfall, surface water runoff, and other factors. Generally, tlie water level is higher and the amount of flow is greater, in the wetter winter months. DISCUSSION AND REGOMMENDATIONS General Based on the results of our study, it is our opinion the proposed development can be constructed generally as planned. Building support may be provided using conve�tion�l spread and continuous foundation systems bearing on the dense to very dense native soiis or on structural fill used to modify site grades. Slab-on-grade floors may be similarly supported. The existing fill encountered beneath the west side of the proposed building location should be compacted to the req .�rements of structural fill or removerJ and replaced with imported structural fill. Thi� report has been prep��ed for speciiic application to this project isi a manner consistent with that levei of care and skill ordinarily exercised by other members of the profession currently practicing under similar conditions in this area for tha exclusive use of the McDonald's Corporation and its representatives. No wa: ranty, expressed or implied, is made. We recommend that this report, in its entirety, be included in the project contract documents for the information of tlie contractor. Site Prenaration and General Earthwork Following removal of the asphalt, the ground surface where foundations, slabs or structural fill are to be placed should be observed by a representative of ECI. The existing fill encountered beneath the west side of the proposed building location should be compacted to the requirements oF structural fill or removed and replaced wiih imported structural fill. Froofrnlling may be necessary in order ta identify soft or unstable areas. Proofrolling sho�ld be performed under the observati�n of a representative of ECI. Soil in loose or soft areas, if recompacted and still yielding, should be overexcavated and replaced with structural fil! to a depth that will provide a stable base bene3th the c�eneral structural fill. The optional use of a geotextile fabric placad directly on the overexcavated surface may help to bri�ige unstable areas. Enrth Conauhent�, Inc.