The power density resulting from the operation of the proposed AT&T facility can be calculated <br />using the formula below: <br />S = 33.4 ERP <br />R2 <br />Where <br />S = Power Density in pW/cm2 (microwatts per square centimeter) <br />ERP = Effective Radiated Power from an antenna in Watts <br />R = distance in meters from the antenna to the location under study <br />This is formula #9 from OET-65, found on page 21 of the OET bulletin. <br />Using this formula with an ERP of 44.25 Watts and a height of 19.6 meters (the height of the <br />proposed antenna, minus 2 meters -to approximate the location of the head of a person <br />standing on the ground near the tower) the maximum power density for AT&T's proposed <br />operations in the cellular band is calculated to be 3.85 pW/cm2, which is 0.67% of the FCC limit <br />at the lowest AT&T frequency in the 850 MHZ cellular band. <br />Using the formula with an ERP of 15.3 Watts and a height of 19.6 meters the maximum power <br />density for AT&T's proposed operations in the LTE band is calculated to be 1.33 pW/cm2, which <br />is 0.29% of the FCC limit at the lowest AT&T frequency in the 700 MHZ LTE band. <br />Using the formula with an ERP of 30.6 Watts and a height of 19.6 meters the maximum power <br />density for AT&T's proposed operations in the PCS band is calculated to be 2.66 pW/cm2, <br />which is 0.266% of the FCC limit at the lowest AT&T frequency in the 1900 MHZ PCS band. <br />These calculations show that the maximum calculated power density produced at two meters <br />above ground level by the proposed AT&T facility alone is less than 1.3% of the applicable FCC <br />exposure limit at all ground level locations. Section 1.1307(b)(3) of the Commission's Rules <br />excludes applications for new facilities or modifications to existing facilities from the requirement <br />of preparing an environmental assessment when the calculated emissions from the applicant's <br />proposed facility are predicted to be less than 5% of the applicable FCC exposure limit. <br />Hatfield & Dawson Consulting Engineers <br />