8215 BROADWAY 2016-01-01 MF Import

ADaPT Eo¢ineerin�, Inc. Site Preparation Site preparation will involve removal of all vegetativc covers, wood and concrete debris, grading, and preparing subgradcs. The following commcnts and recommendations apply to site preparation: Clcarine and Grubbin�: Some grading will be rcquired at the proposed tower lease area. At this location, sitc prcparation will consist of rcmoval of all vcgctative covers, wood and concrete debris, limitcd grading, followcd by found.ation p�eparation for the monopole tower and cquipment cabinet fo�ndation. I3ackfill materials, wherc requircd, should bc placed and compacted according to the recommendations presented in the Structural Fill section of this report Wet Conditions: IIccause of thc high fines content of the existing near surface site soil, these soils are both highly moisture-sensitive and pronc to disturbance when wet. The contractor should minimize traffic above the prepared subgradc areas to minimize disturbance and sottening �vhich would require removal of the unstablc soils. During wet condi(ions, the use of a working surface of quarry spalls or clean sand and gravel may be required to protect lhc subgradc, especially from vehicular traffic. P�ozen Subcrades: If earthwork takes place during freezing conditions, we recommend that all exposed subgrades be allowed to thaw and be recompacted prior to placing subsequcnt lifis oC structural fill. Equiprnent Building or Cabinet Foundation It is our undcrstanding that the foundation for the proposcd equipment building or cabincts will consist of a poured in place concrete slab-on-grade with thickencd edges. We anticipate that the pad bearing pressure will be rclatively light. How�ever, we recommcnd that the thickened slab edges bc dcsigncd as sprcad footings. 7'he following recommendalions and comments are provided for purposes of footing dcsign and construction: Sub�;rade Conditions: Wc anticipate the subsoil cncounrercd at thc proposcd !'oundation gradc will likely consist of loose to mcdium densc, moist, light-brown silty sand with little gravel. Howcver, the test boring was completed on the high side of the leasc arca, and concrete debris is visible at the ground surface in the lease arca. "Co preparc the suUgradc, the near surface soil should be stripped and excavated to a depth oC at Icast 18-inches below the lowest adjacent grade. The material at that elcvation should be com�acted in place if the moisture content allows, resulting in a firm and unyielding subgrade condition. It is possible that overexcavation may be nccessary to rcmove existing GII, concrete nibble or wood debris or if cxcessively soft or wet soils are encounlcred at the foundation design grade levels. Howcver if dcicterious soils or fill are encountered, they should bc removed to a dcpth of no deeper than 2-Ceet below the thickened slab hearing elevation, in light of the li�ht loads imposed by the equipment cabinets. llie resulting excavation should bc backfilled with granular structural fill. A layer of geotextile may be required to separate the strucb�ral fill soils from thc underlying subgradc materials. Foolings should never be cast atop so(l, loose, organic, or frozen soils; nor atop subgrades covered by standing water. A \'oireSVcam Wircless M'Y �8� Z000 ADaPT Projccl No. WA00-4034 P�g� �