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��,_ - <br />LSl Adant <br />Tnrver Drilled Pier Fnundntions <br />Based upon the suUsurface soil asd �aounii�.�utr.r :o�ui;.iuns disclosed by our tesi boring, we recommend <br />the tower be supoorted on �. drilled p�e; ie•i:�� ���r•-.r :'iic f�llowing recommendations and comments are <br />provided forpurposes o1'dril!ed pier de: ign a:,::.c:;:,tr�ct�on: <br />Comaressive Caeacities: We recommend that the drilled pier penetrate at least 15.0-feet below the ground <br />sur}'ace at the location of boring B-1. For vertical compressive soil bearing capacity, we recommend <br />using tha unit end bearing capacity presented in Table ] below. The allowable end bearing capacity, <br />presented in Table 1, includes u safety factor of 1.5 or more. <br />Table ] <br />Allowablc End Bcaring Capacity <br />Depth (feet) Allowable Bcaring Capacity (ts� Limi6ng Point Resistam�e (ts� <br />IS-20 3.0 D/B 5 TSF <br />20-29.5 6.0 D/B 30 TSF <br />Notes: D= the embedment depth (in feet) into the bearing layer. <br />B = pier diameter (feet). <br />Frictional Capacities: For frictional resistance of the drilled piers, acting both downward and in uplifi, we <br />recommend using the allowable skin friction value listed in Table 2. We recommend that frictional <br />resistance be neglected in the uppermos[ 2 feet below the bRound surface. The allo�eahle skin friction <br />value presented includes a safety factor of 1.5. <br />Tablc 2 <br />Allowablc Skio Friction Capacities <br />Deptt !feet) Allowable Skin Friction (tsQ <br />0-2 p <br />�-12 0.05 <br />12-20 0.35 <br />ZO-?9.5 0.70 <br />Sprim PCS Augus� 4, 2fq3 � <br />Adupt I'mject No. WA03-H7?0 Pagc 6 <br />