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Home My WebLink AboutMCUP 08-10; HILTON GARDEN INN WIRELESS; Minor Conditional Use Permit (MCUP)• • Sprint Nextel-NEPARFCompliance Sprint> Together with NEXTEL 6300 Sprint Parkway, Overland Park, Kansas 66251 -Office (913) ~~aGE~.Efili3) 523-0436 Date: March 28, 2008 To: City of Carlsbad Attn: From: David Kirk AFR 1 ·\ WOB crrY 0F C)'.\RLS:13:~D r::r1 \'11:·.1\NC1 OEPT ,I . ..:-J \ ',' Site Address: 6450 Carlsbad Boulevard, Carlsbad, CA 92008 Site Description: rooftop Site Owner: Sprint Nextel The purpose of this letter is to demonstrate compliance with Federal Communication Commission ("FCC") standards in regard to the electromagnetic emissions from the antennas located on the rooftop at site SD55XR018 at the following address: 6450 Carlsbad Boulevard, Carlsbad, CA 92008. The FCC, in regulating electromagnetic radiation, applies a modified version of the standards developed by the American National Standards Institute ("ANSI") and the Institute of Electrical and Electronics Engineers ("IEEE") to include the National Council on Radiation Protection and Measurements ("NCRP") standard for Specific Absorption Rate ("SAR"), for Personal Communication Service ("PCS") bands. These standards, when converted to the more familiar power density specification, set a maximum power density level for public areas at 1.00 mW/cm2 (milliwatts per square centimeter) for general population exposure and 5.00 m W/cm2 for occupational exposure. This level is set 50 times lower than levels the standards committees felt could potentially be harmful for constant exposure. Our antennas are designed to concentrate the majority of their signal power out of the front of the antenna in a very thin beam. Signal strength coming from the back of an antenna and from positions well below an antenna is typically hundreds of times lower than the signal in the main beam at the front of the antenna. Through software modeling techniques, we can calculate the power density from a Sprint Nextel installation at a variety of locations around the proposed site. Once a site goes on-air, routine evaluations are conducted to ensure on-going compliance with FCC regulations. We have developed several proprietary software programs to • • The concept of the spherical model is to assume that the Equivalent Isotropically Radiated Power ("EIRP") of the actual antenna is being applied to a point source (true isotropic radiator). This is valid in the center of the main beam of the antenna but it presents a worst-case scenario. The power density is then calculated by dividing the EIRP by the surface area of the sphere ( 4nr2), for the distance r away from the antenna. In general, we will consider the shortest distance between the antenna and a six (6) foot area above the roof or ground where a person might stand. Additionally, we must multiply the EIRP by a power reflection coefficient to account for the fact that reflections from the roof or ground could add constructively with the incident wave at the point in question. The equation for power density is the following: Where: S is power density in mw/cm2 EIRP is in watts "-ElRP-PRC k) -2 40n--Ra PRC is the power reflection coefficient (we will use 2.56 for most applications, as specified by the EPA) Rd is the radius, direct distance from antenna (bottom) to point of interest, meters Cylindrical Modeling The concept of the cylindrical model is to take the power actually delivered to the antenna and assume it is equally distributed over the surface of a cylinder of the same length as the antenna. If the antenna is a directional antenna then we reduce the surface area of the cylinder by BW/360 (BW is the 3-dB beam-width in degrees). This is a good near-field model. Additionally, if the antenna is mounted above the level, the average power density in a 6-foot tall area immediately above the rooftop level (or where a person might be standing or located), is reduced according to how far above/below the person is in relation to where the antenna is mounted. The equation for the power density is the following: ~ -Kf Ho.,Lo.) S == ___ '-l'------.--B'--f-V.,,- 20. Jr. L{}. • Rk • 360 Where: S is the power density in mw/cm2 Pt is the actual (or worst case assumed) power delivered to the antenna, watts \ t I • • I SECTION 1 NEW DEVELOPMENT PRIORITY PROJECT TYPE Does you project meet one or more of the following criteria: YES NO 1. Home subdivision of 100 units or more. Includes SFD, MFD, Condominium and Apartments x 2. Residential development of 10 units or more. Includes SFD, MFD, Condominium and Apartments ;< 3. Commercial and industrial development g_reater than 100,000 sg_uare feet including_ e.arking_ areas. Any development on private land that is not for heavy industrial or residential uses. Example: Hospitals, X Hotels, Recreational Facilities, Shopping Malls, etc. 4. Heavy Industrial I Industry greater than 1 acre (NEED SIC CODES FOR PERMIT BUSINESS TYPES) SIC codes 5013, 5014, 5541, 7532-7534, and 7536-7539 ?< 5. Automotive repair shop. K SIC codes 5013, 5014, 5541, 7532-7534, and 7536-7539 6. A New Restaurant where the land area of development is 5,000 sg_uare feet or more including_ parkiflJJ. ~ K SIC code 5812 7. Hillside development (1) greater than 5,000 square feet of impervious surface area and (2) development will grade on any ,,x.. natural slope that is 25% or areater 8. Environmentallv Sensitive Area (ESA). Impervious surface of 2,500 square feet or more located within, "directly adjacent"2 to (within 200 feet), X or "dischan:iina directlv to"3 receivina water within the ESA 1 9. Parking_ lot. Area of 5,000 square feet or more, or with 15 or more parking spaces, and potentially exposed to urban ,X runoff 10. Retail Gasoline Outlets -serving_ more than 100 vehicles per day ;< Serving more than 100 vehicles per day and greater than 5,000 square feet 11. Streets, roads. highways, and freeways. Project would create a new paved surface that is 5,000 square feet or greater. )( 12. Coastal Develoe,ment Zone. Within 200 feet of the Pacific Ocean and (1) creates more than 2500 square feet of impermeable X surface or (2) increases imoermeable surface on property by more than 10%. 1 Environmentally Sensitive Areas include but are not limited to all Clean Water Act Section 303(d) impaired water bodies; areas designated as Areas of Special Biological Significance by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); water bodies designated with the RARE beneficial use by the State Water Resources Control Board (Water Quality Control Plan for the San Diego Basin (1994) and amendments); areas designated as preserves or their equivalent under the Multi Species Conservation Program within the Cities and Count of San Diego; and any other equivalent environmentally sensitive areas which have been identified by the Copermittees. 2 "Directly adjacent" means situated within 200 feet of the environmentally sensitive area. 3 "Discharging directly to" means outflow from a drainage conveyance system that is composed entirely of flows from the subject development or redevelopment site, and not commingled with flow from adjacent lands. Section 1 Results: If you answered YES to ANY of the questions above you have a PRIORITY project and PRIORITY project requirements DO apply. A Storm Water Management Plan, prepared in accordance with City Storm Water Standards, must be submitted at time of application. Please check the "MEETS PRIORITY REQUIREMENTS" box in Section 3. If you answered NO to ALL of the questions above, then you are a NON-PRIORITY project and STANDARD requirements apply. Please check the "DOES NOT MEET PRIORITY Requirements" box in Section 3.