2222 EVERETT AVE 2016-01-01 MF Import

• Sub=urface Expforation, Geologic Hazard, and Everert School District Maintennnce Facility Pntfiminary Ceotechnica!Engineering Report Everett, Warhington P,^sign R^commendations � � III. DESIGN RECOI�IME`rUATIONS 7.0 INTRODUCTION Our exploration indicates that, from a geotechnical standpoint, the parcel is suitable for the proposed development provided the risks discussed �re accepted and the recommendations contained herein are properly foll�wed. Tiie existing till on the site is considered a weak to moderate foundation bearing material, primarily suited to parking lot suppurt. The suitable bearing stratum (glaciolacustrine soiq is benveen 6 to IO feet below the surface in the vicinity of the exploration pits. Active use of the existing maintenance faciliry and the existing parking lots prevented excavation in some areas. The depth ro the glaciolacustrine soil may be more or less in those areas. Based on discussions with the architect, there is an adjacent building that may be sensitive to construction related vibrations such as those produccd during pile driving or vibratory comp�cr�c;, of fill soils. We have been asked by the architect to provide non-vibration intensive recommendations for the new construction. Several non-standard, low-vibration options exist for support of the new buildines and parking lot. These low vibration options should be used within 100 feet of the adjaccnt vibration sensitive building. Conventiona? / construction techniques, including vibratory compacting, may be used beyund 100 feet, if ` carefully monitored. Where the structural loads are moderate ro high (approximately 8,000 ps� and/or the buildings can tolerate litdc to no differential settlement, placing the buildings on conventional foundation extended through the fill, or on deep foundations consisting of drilled piers or augercast piles will provide suitable support without inducing large amounts of vibrations. Where buildings are lightly loaded (approximately 2,500 ps� or are more setdement tolerant, placing the building foundations on an overexcavated, 3-foot thick minimum, stuctural fill pad is recommended. Parking lots may be placed on the existing fi�l foflowing a thorough proof-roll and the recompaction of thc upper 12 inches of the existing fill soils. Proof-rolling should be accomplished by a fully loaded dump truck or similar piece of heavy equipment. The proof-roll must indicate that the fill is firm and non-yielding prior to placir.o any pavement section. Areas in the parking lots may need limited over-excavation and replacement to greater than 12 inches in dcpth due to organics or debris in the fill. � May l, ?00/ ASSOCUTEDF�IRTHSCIENCES, /NC. 1DCiJa-XEOIOSIAI•D.�IMyWala01-W:ti Page 7 �