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6.1. & 6.2. SR 10-21-1996ITEM 6.1. & 6.2. °ity of River MEMORANDUM TO: FROM: DATE: SUBJECT: Mayor and City Council Scott Harlicker, Assistant Planne ~:~l/l October 21, 1996 Request for Conditional Use Permit by AT&T Wireless Services, Public Hearing Case No. CU 96-23 and Request for Zone Change, Public Hearing Case No. ZC 96-17 Request AT&T Wireless Services is requesting a zone change to rezone certain property to Antenna Overlay District and a conditional use permit for a wireless communication antenna pole and equipment building. Location The property being utilized is located east of Highway 10, south of 175th Avenue alignment and west of the Burlington Northern Railroad tracks, part of parcel 75-002-3303 Zoning/Land Use C3 (Highway Commercial) / HB (Highway Business) Attachments · Location map · Zoning map · Ordinance No. 96- · Report to the Planning Commission dated 9/24/96 Background AT&T Wireless is proposing to lease an area approximately 60' by 57' to construct a 199 foot tall pole on which they will mount cellular telephone 13065 Orono Parkway · P.O. Box 490 · Elk River, MN 55330 · (612) 441-7420 · Fax: (612) 441-7425 Memo to the Mayor and City Council/CU96-23 Page 2 October 21, 1996 antennas. They are also proposing to construct a 12' by 24' building to shelter electrical equipment. In order to proceed with their proposal, the apphcant has to request that the subject property be rezoned to Antenna Tower Overlay District, and the actual tower is subject to a conditional use permit. The area the apphcant plans on leasing is located in the northeast corner of a 12.5 acre lot adjacent to the west side of the Burhngton Northern Railroad tracks. The property is currently undeveloped and contains a stand of pine trees. Adjacent land uses include Riverview Sports and undeveloped commercial and residential property. The site will be accessed by a 12 foot wide gravel driveway with access from the Highway 10 service road. The gravel driveway will be located within a 20 foot wide private access easement over the adjacent properties to the west. The hmited amount of troffic, about one maintenance visit to the site per month, will not have an impact on the transportation system. The mono pole will be self supporting and will be painted arctic ice blue to blend in with the sky. The existing vegetation will provide screening for the equipment building. No hghting or signage is proposed for this pole. In order to better manage the proliferation of cellular antennas, antenna poles should be capable of being used by other cellular providers. This pole has been designed so that it can accommodate additional antennas for use by other cellular companies. Overview Rezoning In order to construct the proposed antenna tower a rezoning of the property is needed to Antenna Tower Overlay District (AT). This special overlay district was estabhshed to manage the proliferation of antenna towers and to insure their proper placement regarding the health, safety and welfare of the community. This overlay district does not change the underlying Highway Commercial (C3) zoning. All the uses allowed in the C3 district will continue to be allowed and the dimensional regulations of the C3 district will also continue to be in effect. In considering a rezoning request of this nature, consideration should be given to the existing conditions within the area directly and indirectly affected by the rezoning proposal as well as compatibility with surrounding land uses. The proposed rezoning of this lot to AT should not adversely affect the subject s :\planning\scott\cu9623cc.doc Memo to the Mayor and City Council/CU96-23 Page 3 October 21, 1996 property or the adjacent properties and would not be incompatible with the surrounding land uses. Conditional Use Permit Section 900.12.19 of the Ordinance outlines performance standards applicable to antenna towers. The proposal was compared to these standards and was found to be in compliance with them. One of the main concerns with these towers is the possibility that the tower will collapse on adjacent properties. The manufacturer of the pole has indicated in a letter that the pole is engineered to collapse on itself, not fall over like a tree and land on the neighboring lot. Because the proposed height of the tower does not exceed 200 feet, the applicant is not required to file for F.A.A. authorization. The pole doe not encroach into any setback, fight-of-way, property line or sidewalk. The pole will also designed to exceed the wind loading factor of the Unified Building Code and will meet all electrical requirements. To discourage climbing there will be no climbing apparatus within 12 feet of the ground and the applicant has agreed to construct a fence around the facility. The applicant has stated that they have not received any report of television or radio interference nation wide. The applicant contacted the St. Paul office of the F.A.A. and their office had not received any complaints of interference caused by cellular phones. The zoning code states that multiple principle structures on a single lot require a conditional use permit. Since this pole is considered a principle structure, any further development of this property will require a conditional use. This will allow the city an opportunity to insure that the antenna pole and access to it is integrated into future development of the property. Planning Commission Meeting At the Planning Commission meeting held on September 24, 1996 the neighboring property owner to the north, Mr. Majkrzak, spoke against the antenna tower. He voiced concern about the antennas impact on satellite reception and how the tower would impact his property values. The applicant addressed his concern regarding the impact on satellite reception; the applicant indicated that it was the long range microwave antennas, not cellular transmissions, that affect satelhte dish reception. Recommendation The Planning Commission and staff recommend that the City Council approve the rezoning request to Antenna Tower overlay District based on the following: s:\planning\scott\cu9623cc.do c Memo to the Mayor and City Council/CU96~23 October 21, 1996 Page 4 1. The rezoning would not adversely affect the property under consideration. o The rezoning would be compatible with surrounding land uses and zoning districts. o The applicant has shown that the proposed rezoning is necessary in order to provide effective cellular phone coverage for this area. The Planning Commission and staff recommend that the City Council approve the conditional use permit to allow AT&T Wireless to construct an antenna tower with the following conditions: 1. A six foot high non-chmbable fence shall enclose the facility. o The tower shall not contain any signage, including logos, except as may be required by State and Federal regulations. o The tower and equipment building shall be removed within 6 months of cessation of operation unless a time extension is granted by the City Council. In the case of multiple users of this tower, this condition shall not become effective until all users of the tower cease operations for 6 months. o A site plan be submitted including all the conditions for approval prior to constructing the antenna pole and equipment building. s:\planning\scottkcu9623cc.doc TOPOGRAPHIC SURVEY AND SITEPLAN FOR AT~T WIRELESS SERVICES OF MINNESOTA, INC. ELK RIVER SITE 'ity of IT~ 6.5. & 6.6. MEMORANDUM iver FROM: DATE: Planning Commission Scott Harlicker, Assistant Planner September 24, 1996 SUBJECT: Request for Conditional Use Permit by AT&T Wireless Services, Public Hearing Case No. CU 96-23 and Request for Zone Change, Public Hearing Case No. ZC 96-17 Request AT&T Wireless Services is requesting a zone change to rezone certain property to Antenna Overlay District and a conditional use permit for a wifeless communication antenna pole and equipment building. Location The property being utihzed is located east of Highway 10, south of 175th Avenue ahgnment and west of the Burlington Northern Railroad tracks, part of parcel 75-002-3303 Zoning/Land Use C3 (Highway Commercial) / HB (Highway Business) Attachments · Location map · Zoning map · Site plan · Elevation drawings of pole and equipment building · Service area coverage maps · Letters from AT&T dated August 27,1996 and September 12, 1996 Background AT&T Wireless Services is proposing to lease an area approximately 60' by 57' in order to construct a 199 foot tall pole on which they will mount cellular 13065 Orono Parkway · P.O. Box 490 · Elk River, MN 55330 · (612) 441-7420 · Fax: (612) 441-7425 Memo to Planning Commission Page 2 September 24, 1996 telephone antennas. They are also proposing to construct a 12' by 24' building to shelter equipment. The area the applicant plans on leasing is located in the northeast corner of a 12.5 acre lot adjacent to the west side of the Burlington Northern Railroad tracks. The area to be leased is currently undeveloped and contains a stand of 8" to 12" diameter pines. The adjacent land uses include Riverview Sports and Marine and undeveloped land, both commercially zoned and residentially zoned. The site is fiat and will require little grading. The site will be serviced by a 12 foot wide gravel drive with access from the Highway 10 service road. The gravel drive will be located within a 20 foot wide access easement over the adjacent properties to the west. In order to better manage the potential proliferation of antennas in the city cellular antennas should be capable of being used by other cellular providers. This pole has been designed so that it can accommodate additional antennas for use by other cellular companies Overview Rezoning In order to construct the proposed antenna, a rezoning of the property is needed to Antenna Tower Overlay district (AT). This special overlay district was set up to manage the proliferation of antenna towers and to insure their proper placement regarding the health, safety and welfare of the community. This overlay district does not change the underlying Highway Commercial (C3) zoning, all the uses allowed and the dimensional regulations in the C3 zoning district will continue to be allowed on land zoned into the AT. In considering a rezoning request of this nature, consideration should be given to the existing conditions within the area directly and indirectly affected by the rezoning proposal as well as compatibility with surrounding land uses. The existing conditions of adjacent properties include undeveloped residential zoned and commercial zoned property and some older commercial buildings along the Highway 10 frontage road. The adjacent properties to the north, west and south is zoned either highway commercial or light industrial. To the west is the railroad tracks and undeveloped residential zone property. The rezoning of this lot to AT should not adversely affect the property under consideration or the adjacent properties and it would not be incompatible with the surrounding land uses. The applicant has also provided information identi~ing changes and advances in the cellular telephone industry that make it necessary to construct an antenna at the proposed location. They have also provided coverage maps of the Memo to Planning Commission Page 3 September 24, 1996 area showing the expanded coverage that would result in the placement of the proposed antenna. Recommendation It is recommended that the Planning Commission recommend approval of the rezoning request to Antenna Tower Overlay District based on the following: 1. The rezoning would not adversely affect the property under consideration. 2. The rezoning would be compatible with surrounding land uses. o The applicant has shown that the proposed rezoning to AT is necessary in order to provided effective cellular phone coverage for this area. Conditional Use Permit Performance standards The application was compared to the following performance standards found in Section 900.12.19 (Antenna Tower Overlay District): The apphcant has provided a letter from the manufacturer of the pole, Valmont Industries Inc., which gets into the structural and engineering details of the pole and why there is no danger of the pole collapsing on to adjacent property. This letter is included for your review. o There is only one tower proposed for this lot and the lot exceeds the one acre minimum lot size requirement. The height of the tower, 199 feet, does not exceed the 240 foot maximum height allowed in the zoning code. Because of the proposed height of the tower does not exceed 200 feet, the apphcant is not required to file with the F.A.A. for authorization. However, the apphcant has indicated that they will supply a report prior to receiving a building permit. No portion of the pole, supports or related equipment extends across any right-of-way, property line, public street or sidewalk; the pole and the equipment building comply with the setback requirements. The applicant has indicated that the pole will be designed to exceed the the wind loading factor prescribed in the Uniform Building Code. Memo to Planning Commission Page 4 September 24, 1996 The applicant has indicated that the tower will be grounded against lighting strikes and will comply with the electrical requirements of the city. The tower will be constructed to discourage climbing in that the climbing apparatus will be removed within 12 feet of the ground. Staff is also suggesting that the facility be fenced. Because of the placement of the pole on a remote section of this 12.5 acre lot, the design and color of the pole and the existing vegetation, the offsite impacts will be minimal. The pole will be painted arctic ice blue to blend in with the sky and will be placed in the rear of the property in a grove of pine trees. There is no lighting proposed for this pole so lighting will not be a factor. The limited traffic associated with maintenance of the site will not have an impact on the transportation system. The applicant has provided a diagram showing the different frequencies at which television, radio and cellular broadcast. The applicant has stated that they have not received any report of television or radio interference nationwide. The applicant contacted the St. Paul office of the F.A.A. and their office had not received any complaints of interference caused by cellular phones. Impact on Property The zoning code states that multiple principle buildings on a single lot require a conditional use permit. Since this pole is considered a principle structure, any further development of the property will require a conditional use permit~ Recommendation It is recommended that the Planning Commission recommend approval of this conditional use permit to construct a 199 foot tall antenna tower and equipment building with the following conditions: 1. A six foot high non-climbable fence shall enclose the facihty. The tower shall not contain any signage, including logos, except as may be required by State and Federal regulations. o The tower and equipment building shall be removed with 6 months of cessation of operation unless a time extension is granted by the City Council. In the case of multiple users of this tower, this condition shall not become effective until all users of the tower cease operations for 6 months. Memo to Planning Commission Page 5 September 24, 1996 Should Burlington Northern Railroad have any concerns, they shall be addressed prior to the issuance of a building permit. s:\planning\scott\cu96-23 LOCATIO 170TH 16 g"13-{ 158TH 167T~ 165TH 163RD 16:ZND , 1615T ~. , ~ LOCATION ~'~-~"~"~ iver MAP Z 178TH // Rid HILLSIDE CITY PARK 176TH 175'~-i 1741~ ~73R0 172ND 170TH 169i'1-1 168TH I1 167TH i 166TH ~. ZONING City of ~' . MAP Ell/' R]ver zc 13065 OronoParkway. P.O. Box 490Elk River, MN 55330 CASE: i~ V ~l~l~ ' Z 3 N i Ltl ¢ ( UL TEIG r~,~[[~s ) ULTEIG ENGINEERS, INC. ,..5201 EAST RIVER ROAD, SUITE ,.308 MINNEAPOLIS, MINNESOTA 55421 PHONE (612) ,..571--2500 FAX (612) AT&T WIRELESS SERVICES OF MINNESOTA, INC. ELK RIVER SITE ELK RIVER, MINNESOTA 57 --I 68 LINE- L~WAVE ANTENNA (TYP.) SSAGING A N T E NNA (TYP,) ANTENNA SIZES SECTOR ANT. NO, H ~/ D ALPHA PD10189 98" 7.6" 5" BETA PD10177 86" 10.375' 5" GAMMA PDI0200 94" 7" 4.5" NB BCB87010ND 136" 3"0 __ ~2'x24' EQUIPMENT SHELTER SCALE: 1" = 30'-0" ULTEIG ENGINEERS, INC. 5201 EAST RIVER ROAD, SUITE 508 MINNEAPOLIS, MINNESOTA 55,4-21 PHONE (612) 571--2500 FAX (612) AT&:T WIRELESS SERVICES OF MINNESOT^, INC. ELK RIVER SITE ELK RIVER, MINNESOTA 168 iN  ' PDi0200 330° GANNA  PDiOPO0 ]0 DNBCD87010ND~ 4 210° BETA PDlO177 CD87010ND DN 110° PDlO189 ALPHA 110° PDlO189 BCD87010ND DN SCALE: i/4" = 1'-0" Cellular Division AT&T Wireless Services 2515 24th Avenue South Minneapolis, MN 55406 612 721-1660 FAX 612 721-4770 August 27, 1996 Honorable Mayor and City Council Members Planning Commission City of Elk River 13065 Orono Parkway P.O. Box 490 Elk River, MN 55330 Conditional Use Permit Application Wireless Communication Antenna Site Honorable Mayor, Council Members, and Commissioners: This letter accompanies an application for a Conditional Use Permit to construct a Wireless Communication antenna site on land owned by Mr. Les Lundquist and Mr. Floyd Kruse. The property as is sits today is currently undeveloped. The request is being made in the name of AT&T Wireless Services. The fee owners have consented to this application and have entered into a lease agreement with the applicant for a portion of their property. Drawings and site surveys of the property accompany this letter. The Proposed Use. The site would be used by AT&T Wireless Services, one of the two companies who were originally licensed by the Federal Communications Commission (FCC) to provide essential cellular communications services to the Twin Cities. The proposed project would include a steel monopole with antennas attached to it and the construction of an equipment building to accommodate cellular radio and switching equipment. The proposed location is on the approximate northeasterly portion of the property. This specific site was chosen based on the following criteria: · AT&T Wireless Services' engineering and system development needs · The need for improved cellular coverage as dictated by our customers ~. (-~,~ Recycled Paaer Wireless Communication Antenna Site Elk River, Minnesota Page 2 The proposed site will be contained within approximately a 30'x 50' area. The general area is surrounded by several Pine trees, which will give aid in the screening of the proposed development. A fence, if desired by the staff, will be placed around the entire proposed development to create a safe and secure environment. A site plan, drawings, and photographs of the proposed project accompany this application. The Monopole. The proposed monopole will provide the support for the cellular antennas and related cabling necessary to connect the antennas themselves to the radio equipment shelter. It is constructed of steel, is completely self-supporting, and will be painted Artic Ice Blue to blend with the skyline. It will be engineered and manufactured by Valmont Industries, Inc. of Valley, Nebraska. We will provide detailed engineering data for permitting purposes to your Building Inspections Department when this request is granted. AT&T has specifically engineered this monopole to allow for potential future co-location by other wireless providers. Equipment Building. The proposed equipment building will house radio, computer, and climate control equipment for this site. The equipment is powered by 220 volt, single phase, AC electric. It will be connected to AT&T Wireless Services' central switching offices via traditional telephone lines. As a result, no one will need to be present at the site on a daily basis. There will only be an occasional visit (average of once a month) for routine maintenance. The equipment produces no noise, smoke, fumes, glare, or odor. The building itself is approximately 12' wide, 28' long, and 10' high. It is manufactured of a fiberglass exterior and is designed to meet your codes. It will be brought to the proposed site by truck, off-loaded, and set on permanent concrete footings. Antennas. The antennas will be attached to the monopole and will transmit and receive the FM radio signals that carry voice and data between the cellular system users and AT&T Wireless Services' central switch. The physical size of the antennas depends on the type and manufacturer. The area in which cellular coverage is needed largely defines the required antenna height. Naturally, topography and surrounding trees and buildings also play an important role in arriving at the appropriate height. AT&T Wireless Services' engineers have determined that the height necessary at this location is 199 feet. Wireless Communication Antenna Site Elk River, Minnesota Page 3 The Cellular Phone System. Users of cellular telephone service include members of the business community as well as the public sector. Commuters, doctors, salespeople, business owners and executives all benefit by using cellular phones. Additionally, cellular telephones are used extensively by fire, police, and other public safety officials and departments. The system allows police and others to conduct discreet communication in the field, and it enables direct communication with individuals in need of assistance even when a traditional telephone is unavailable. Cellular phone users can contact "911" to report accidents, fires, or other emergencies without first having to search for a telephone. Mr. James R. Beutelspacher, 9-1-1 Project Manager for Minnesota, wrote that "the unimpeded growth of cellular service is an important adjunct to 9-1-1 emergency reporting.". Cellular is a low-power system. The amount of energy generated from a single cellular phone channel is approximately 100 watts. This is less energy than is generated by the typical cordless telephone which is used in many homes today. The Question of Interference. The cellular phone system operates on a specific set of channels set aside by the Federal Communications Commission. The filtering of spurious signals is very tightly controlled. Cellular telephones operate within a strictly regulated set of allotted frequencies between 825 and 845 megahertz (MHz) and between 870 and 890 MHz. AT&T Wireless Services is currently licensed to operate in over 100 major markets nationwide with hundreds of antennas. There has not been any instance of television or radio interference reported. All AT&T Wireless Services sites must be operated in accordance with our FCC license to provide cellular service in this area. Mr. Albert S. Jarratt, Jr., Engineer in Charge of the St. Paul Field Office, Field Operations Bureau of the FCC, confirmed that the FCC has not received any complaints of interference by cellular phone transmissions with home electronic entertainment equipment in any of the five states in which Mr. Jarratt's office has jurisdiction. The Cellular Grid. Cellular service provides subscribers with highly portable phone service by developing a grid of radio cells arranged in a geographically hexagonal pattern. Each "cell" is created by an antenna which serves as the link between the customer and the system while the customer is within that particular cell. As callers move from one cell to the next, their calls are switched, or "handed off," to the next cell's antenna site. Wireless Communication Elk River, Minnesota Page 4 Antenna Site Each cell can only handle a finite number of calls at any one time. As the number of customers increases, the grid must be changed to handle the increasing number of calls. This usually means that more cells need to be created within the same geographical area, resulting in a new grid pattern of smaller cells. This need for more cellular calling capacity originally brought this antenna site to this location. Accompanying this letter is information that more thoroughly explains the cellular system. While the area in which cellular coverage is needed largely defines the required antenna height, topography also plays a role in arriving at the appropriate height for the tower. This is true because cellular telephone signals cannot travel through large structures or through the earth. One of the keys to cellular engineering is to take care to design each cell to be the proper size. If a cell is too large, it will interfere with the operation of neighboring cells, and callers will hear other conversations or "cross-talk." If a cell is too small, some areas between cells will be left without any service and callers will not be able to use their phones. If a caller is in a valley or if a hill lies between the caller and the cell's antenna, the area acts as if there is no antenna at all. When topography comes into play, cellular telephone service can be both difficult to provide and frustrating to use. Cellular engineers now employ the use of directional antennas in an effort to accommodate the topography. By increasing the elevation of the antennas and tilting the antennas downward, the cellular signal is projected over the top of hills and down into valleys without increasing the cell's overall size. Indeed, this technology will be employed at this particular site. The Conditional Use Permit. The City of Elk River, in it's Conditional Use Permit Application and zoning ordinances set forth the following standards by which the City Council shall approve, amend, or deny a conditional use permit: 1. Will not endanger, injure or detrimentally affect the use and enjoyment of other property in the immediate vicinity or the public health, safety, nwrals, comfort, convenience or general welfare of the neighborhood or the City. The property surrounding the proposed site is zoned C-3 Commercial. The communications facility that is being proposed is designed to serve this types of use, as well as the general public. Providing improved cellular telephone capacity and coverage to the surrounding area will have a positive impact for the present and future businesses in the area. 2. Will be consistent with the comprehensh,e plan. One of the purposes and intents of the Zoning Ordinance and the Comprehensive Plan is to provide essential services to the public, including communication services. For the reasons set forth in greater detail above, cell site in this general location is necessary to provide adequate cellular telephone service to this area of the City and surrounding areas. Allowing the cell site to be located here, subject to reasonable conditions, is consistent with the purpose and intent of the Zoning Ordinance and Comprehensive Plan. The Wireless Communication Elk River, Minnesota Page 5 Antenna Site Comprehensive Plan designates the site for Commercial uses. The cell site is consistent with and serves this type of use. The use is therefore consistent with the Comprehensive Plan. 3. Will not impede the normal and orderly development and improvement of surrounding vacant property. AT&T Wireless Services has installed over 100 cell sites throughout the state. In no instance has there ever been any evidence that a cell site has caused any depreciation of surrounding property values. Because of the commercial nature of this proposed site, any improvement or development of the surrounding vacant properties could be developed with out any problem. 4. Will be served adequately by and will not adversely affect essential publicfacilities and services including streets, police and fire protection, drainage, refuse disposal, water and sewer systems, parks and schools; and will not, in particular, create traffic congestion or interference with traffic on adjacent and neighboring public thoroughfares. The only public utilities or services that the proposed use requires is electrical services, which is ample for AT&T Wireless Services needs at this site. The proposed site has access off the service road and has a permanent easement for access to the property that the pole and shelter will be constructed on. Because of the computerized operation of this technology, site visits will be infrequent, approximately one visit per month, which will eliminate any traffic congestion or interference with traffic on the surrounding public streets. 5. Will not involve uses, activities, processes, materials, equipment and conditions of operation that will be detrimental to any persons or property because of excessive traffic, noise, smoke, fumes, glare or odors, dust or vibrations. The cell site that is being proposed will not cause any hazardous or detrimental activities to any person at the site or surrounding area. All equipment is self contained within the building which will not create any noise, smoke, fumes, glare or odors. 6. Will not result in the destruction, loss or damage of natural, scenic or historical feature of major importance. The use would not create excessive additional costs for public facilities or services. Because of the nature of the proposed site, minimal construction will take place which will not cause any damage to the site or surrounding area. The general area is mostly zoned Light Industrial which does not have any scenic or historic features. 7. Willfully comply with all other requirements of the City's Code of Ordinance, including any applicable requirements and standards for the issuance of a license or permit to establish and operate the proposed use & the City of Elk River. As stated earlier, AT&T Wireless Services intends to fully comply with the City's code requirements and work closely with City Staff. The granting of the CUP will alleviate problems for AT&T Wireless Services and it's customers in this area, including city and county departments of public safety. Wireless Communication Antenna Site Elk River, Minnesota Page 6 Conclusion. This letter should serve to better explain our application and to answer some of your questions. If we can be of further assistance, please feel free to contact me at 612-844-6741. I will, as well as other representatives of AT&T Wireless Services will be in attendance at the Planning Commission and City Council meetings to address any additional questions that you may have. AT&T Wireless Services appreciates the assistance that we have already received from the City's staff, and we look forward to working with you to better serve the area. Thank you for your consideration. Sincerely, Ronald L. Mielke Real Estate Acquisition Manager AT&T Wireless Services Enclosures - AT&T Cellular Division September 12, 1996 AT&T Wireless Services 2515 24th Avenue South Minneapolis, MN 55406 612 721-1660 FAX 612 721-4770 Mr. Scott Harlicker Planning Department City of Elk River 13065 Orono Parkway P.O. Box 490 Elk River, MN 55330 Re: Additional information for Antenna Tower Overlay Zone Dear Scott: As per our telephone conversation and the Fax that you sent to me, I am sending you some additional information that you requested. As pertaining to: 1. Elevations: I am enclosing an elevation drawing prepared by Ulteig Engineers, Inc., depicting the pole, antenna placement and the equipment shelter. The height of the pole is 197 feet with the tip of the antenna placed at 199 feet. The equipment shelter measures 12'x24' in size. 2. Proof of need: I am enclosing colored copies of frequency coverage. One of the diagrams shows the existing conditions and coverage and the other diagram shows the improved conditions and coverage. The red area show the acceptable coverage and the green shows the unacceptable coverage. 3. Proof of non-interference: I am enclosing a diagram showing the different frequencies that are used by cellular, radio and television stations. Because of the difference in frequencies, there is no interference caused by the cellular (wireless) equipment. 4. Revised site plan: The revised site plan shows the access to the site, plus some of the trees and vegetation that must be removed for the construction of the site. If required AT&T Wireless Services will replace some of the vegetation with new landscaping. 5. F.A.A. or Minnesota Department of Transportation regulation: Any tower that exceeds 200 feet in height, an application must be submitted to the F.A.A. for their review. Because of the proposed height of the pole and antenna's, AT&T is not required to file for F.A.A authorization, but AT&T usually files for all locations and has Recycled Paper Page 2 Elk River, Minnesota for this particular site. A letter or report will be given to the City of Elk River prior to receiving a building permit. 6. Antenna Towers shall be designated to withstand a uniform wind loading as prescribed in the Uniform Building Code: According to Uniform Building Code, towers shall withstand wind loads to 80 mph. AT&T has the poles engineered to withstand winds up to 90 mpg with 0.5 inches of radial ice. See attached letter from Valmont Industries, Inc. 7. Antenna Towers shall be grounded for protection against a direct strike by lighting and shall comply as to electrical wiring and connections with all applicable codes and regulations: At the time that AT&T applies for all building permits, drawings with all specifications will be supplied to the city. AT&T meets and usually exceeds the requirements set forth by the city. 8. Every Antenna Tower shall be protected to discourage climbing of the Structure by unauthorized persons. To prevent unauthorized climbing, Antenna Towers shall comply with one of the following requirements: To prevent unauthorized climbing, AT&T removes climbing apparatus within twelve feet of the ground and at times places a protective fence around the structure. 9. The petitioners for an Antenna Tower must demonstrate, based on the topography of the site, surrounding structures and vegetation and the design of the tower, that off-site impacts from items such as lighting, electrical interference, and visual impacts as well as safety issues will be minimal: The placement of the proposed structure is placed in an area that minimal population and traffic. AT&T is not proposing to have any lighting on the structure, thus not causing any interference. The electrical to the site will be that of existing power that is in the area. The visual impact will be minimal because of the design that is used by AT&T. The pole is a steel self-supporting monopole. The color of the pole will be painted a pale blue to blend in with horizon. The safety issues are addressed in the letter from Valmont Industries, Inc. Scott, I hope that this addresses all the issues, but if you should if you should have any other additional questions, please feel free to contact me. Bes~ards, Ronald L. Mielke Real Estate Acquisition Manager Valley. NeDraska 6806z1.0358 U.SA. · 1402) 359-220'~ City of Elk River Planning Department City Hall 13065 Orono Road Elk River, MN 55330 9/11/96 ATTENTION: Mr. Scott Harlicker SUBJECT: Failure Modes for Poles and a Description of the Design Criteria A T and T Wireless Elk River, MN Pole Valmont Order 12867-96 Dear Mr. Harlicker: I have been asked to write to you about the mode of failure for pole type structures used to support cellular antennas and equipment, and give some information to allow you to judge how remote the chances of that failure occurring would be. I think it would be appropriate to start off by a brief description of the design criteria that is typically used. l'he poles Valmont supplies are designed in accordance with the E.I.A. / T.I.A. 222 Revision F Standard entitled "Structural Standards for Steel Antenna Towers and Antenna Supporting Structures." This is an approved A.N.S.I. standard that has dealt with the design of lattice type structures for a number of years. Revision E was the f'u'st version that went into extensive detail about the design of pole type structures. The provisions of the standard have, as their foundation, provisions of other nationally known specifications and standards that have a long history of reliability. This history should be of interest to you considering the hundreds of thousands of sites throughout the United States which have structures designed with concepts spelled out in publications like "The Design of Steel Transmission Pole Structures" (published by A.S.C.E.), and "Standard Specifications for Structural Supports for Highway Signs, Luminaries and Traffic Signals" (published by A.A.S.H.T.O.). Many of the concepts used to design poles in these two publications are included in the E.I.A./T.I.A. 222 Revision F Standard. The E.I.A. / T.I.A. 222 Revision F requirements would dictate in Hennepin County Minnesota a basic design wind speed of 80 mph and / or 69 mph with 0.5 inches of radial ice. The wind speed to be used depends on the location of the site within the state. Valmont's policy is to use the wind loading listed in E.I.A. / T.I.A. 222 as a minimum loading. A T and T gave us a wind speed of 90 mph with 0.5 inches of radial ice for this project. This represents and increase in loading of at least 27% more than the E.I.A. Standard would dictate. Statistically, the wind speed listed in E.I.A. / T.I.A. 222 has been determined to be that wind which has an average reoccurrence of 50 years. This wind is also a "fastest mile" wind which means that it is the average velocity of a mile of wind passing a point. For example, a 70 mph average fastest mile wind would take 51 seconds to pass a point. This standard "fastest mile" wind is :ustomized with factors that apply to the particular installation. There is a 1.69 gust response factor imposed in order to account for sudden changes in wind speed, a height coefficient to account for increasing wind speed with height, and an exposure coefficient to account (to some degree) the terrain effects. The loads generated by this wind and the weight of the members (along with any ice considered) are then used to size members of the pole. There is at least a 25 % factor of safety required under these conditions. This assumes that the wind is blowing from the worst possible direction. Some directions are worse than 'others, depending on the equipment attached to the pole, the arrangement, and the orientation. The wind must exceed all our estimates for magnitude, duration, be at the worst orientation and overcome the factor of safety. Let us assume that a pole becomes overloaded. The typical consequence of this overloading is "local buckling" where a relatively small portion of the shaft distorts and "kinks" the steel. This does not cause a free falling pole. After the buckle, the cross section of the pole is capable of carrying the entire vertical (weight) load and a substantial portion of the load that caused buckling. The pole is likely, however, to be out of plumb. This may be somewhat dramatic and the buckled section should be replaced. There are 3 mechanisms which prevent the pole from a free fall type failure. First, as the pole distorts this distortion may relieve the load from the pole either by orienting the pole more favorably in the wind or, if buckling has occurred, by reducing the moment arm of the wind force. The second mechanism involves a redistribution of the stress in the pole after .buckling toward the remaining portion of the cross section that has unused capacity. The third phenomenon and most important, is the nature of the force being applied. We expect the wind to produce this force. A wind that would cause a buckle would be larger than the basic wind speed, the gust factor, and the factor of safety combined. A gust would soon dissipate and, after this peak wind is gone, the stress in the pole would be reduced. Poles are flexible, forgiving structures which are not generally susceptible to damage by impact loads such as a wind gust or earthquake shocks. It takes some time for the entire structure to "see" the impact loading. Even after a local buckle, the pole has significant capacity. It is this capacity along with the transitory nature of the .~.,)loading that prevents a pole from "falling over." Pole design and testing have provided the public with a very reliable product. Poles have gone through extensive full scale testing, resulting in a history of being extremely reliable. The public I think, has been well served. Valmont has provided structures that have performed well during the earthquakes in California, the hurricanes in the South including Hugo, Andrew and Opal, (we have no word yet on Fran) and a number of tornadoes. To my knowledge, Valmont has never experienced an in service failure of a communication pole due to weather induced overloading, even though, as in the cases of Hurricane Hugo and Hurricane Andrew, the wind speeds may have exceeded the design wind speed. I hope this has helped. Please feel free to call with any comments you may have. I can be reached at 1- 800-345-6825- ext. 3739 and will be glad to discuss any concerns you may have. Sincerely, Anthony J. Hansen PE Manager of Communication Structure Engineering Valmont Industries Inc. ORDINANCE 96 - CITY OF ELK RIVER AN ORDINANCE AMENDING THE CITY OF ELK RIVER ZONING MAP TO REZONE CERTAIN PROPERTY TO ANTENNA TOWER OVERLAY DISTRICT (AT) CASE NO. ZC 96-17 The City Council of the City of Elk River does hereby ordain as follows: Section 1. The duly adopted Zoning Map of the City of Elk River is hereby amended to rezone the property described as: See Attached Exhibit A Section 2. The rezoning is being approved based on the following findings: The rezoning would not adversely affect the property under consideration or the adjacent properties. The rezoning would be compatible with surrounding land uses and zoning districts. ° The applicant has shown that the proposed rezoning is necessary in order to provide effective cellular phone coverage for this area. Section 3. That this Ordinance shall take effect and be in full force from and after the date of its publication. Passed and adopted this __ day of Council of the City of Elk River. ., 1996, by the City ATTEST: Henry A. Duitsman, Mayor Sandra A. Thackeray, City Clerk s:Xdocumentkordinancek/zc96-17.doc EXHIBIT A Description: That part of the South Half of the Southwest Quarter that lies Northeasterly of the Northeasterly right-of-way line of U.S. Highway No. 10 and Southwesterly of the railroad right-of-way being in Section 2, Township ,32, Range 26, Sherburne County, Minnesota, and being subject to the town road except the following five parcels: 1. The North 100 feet thereof. 2. Commencing at the intersection of the Northeasterly right-of-way line of U.S. Highways 10, 52 and 169 as presently located and established and the Northerly right-of-way line of the Township road and said Northerly right-of-way line being 66 feet North of the South line of said Section 2; thence Northwesterly along the right-of-way line and the extension thereof o distance of 575 feet; thence Northeasterly at right angles a distance of 50 feet to intersect said Northeasterly right-of-way, line of U,S. Highways 10, 52 and 169; thence at right angles Northwesterly along the said Northeasterly right-of-way line of U.S. Highways 10, 52 and 169 a distance of 90 feet; thence at right angles Northeasterly a distance of .500 feet; thence at right angles Southeasterly a distance of 90 feet; thence at right angles Northeasterly a distance of 167.85 feet; thence at right angles Southeasterly and parallel with the Northeasterly right-Of-way of said U.S. Highways a distance of 175 feet; thence Southwesterly at right angles a distance of 197.8.3 feet; thence Southeasterly and parallel with said highway right-of-way to on intersection with the No~herly line of the Town Road; thence Westerly along the Northerly right-of-way line of the town road to the point of beginning. 3. All that part of the Southwest Quarter of the Southwest Quarter of Section 2, Township 52, Range 26, Sherburne County, Minnesota, described as follows: Commencing at the point of intersection of the Northeasterly line of the right-of-way of U.S. Highway Nos. 10 and 52, as presently located and established, with the North line of the right-of-way of 175rd Avenue N.W. (formerly a town road), said North line of said Avenue also being the North line of the South 66 feet, as measured at right angles, of said Southwest Quarter of the Southwest Quarter; thence Northwesterly along said Northeas[erly line of the right-of-way of U.S. Highway Nos. 10 and 52 for 144..30 feet; thence Northeasterly at rioht angles for 500 feet to a point to be hereafter known as Point "A~' for the purposes of this description; thence Southeasterly parallel with said Highway right of way for 254.,30 feet, more or less, to intersect said North line of the South 66 feet of the Southwest Quarter of the Southwest Quarter, said point of intersection also being the actual point of beginning of the land to be hereby described; thence return Northwesterly along said parallel line to said Point "A"; thence Northeasterly at right angles for .340 feet; thence Southerly for .365.14 feet, more or less, to a point on said North line of the South 66 feet a distar~ce of 150 feet East of the point of beginning; thence West along said North line of the South 66 feet for 150 feet to the point of beginning. Containing 1.60 acres, more or less. s :\document\or dinance\/zc96 - 17 .doc 4. That part of the Southwest Quarter of the Southwest Quarter of Section 2, Township 32, Range 26, Sherburne County, Minnesota, described as follows: Commencing at the point of intersection of the Northeasterly line of the right-of-way of U.S. Highway Nos. 10 and 52, as presently located and established, with the North line of the right-of-way of 173rd Avenue N.W. (formerly a Town Road), said North line of said Avenue also being the North line of the South 66 feet, as measured at right angles, of said Southwest Quarter of the Southwest Quarter; thence Northwesterly along said Northeasterly line of the right-of-way of U.S. Highway Nos. 10 and 52 for 144.50 feet; thence Northeasterly at right angles for 500 feet to the actual point of beginning of the land to be hereby described; thence Northwesterly parallel with said Highway right of way for 255.70 feet; thence Northeasterly at right angles for 290 feet; thence Southea§terly for 260.54 feet, more or less, to a point, on said line at right angles to the Highway right of way and passing through the poiqt of begin, ning, at a distance of 540 feet Northeasterly of said point of beginning; thence Southwesterly along said line at right angles to the Highway right of way for 540 feet to the point of beginning. Containing 1.84 acres, more or less. 5. That part of the Southwest Quarter of the Southwest Quarter of Section 2, Township 32, Range 26, Sherburne County, Minnesota, described as follows: Commencing at the intersection of the Northeasterly right-of-way line of U.S. Highways No. 10, 52 and 169, as presently located and established and the Northerly right-of-way line of Township Road, said Northerly right-of-way line being 66 feet North of the South line of said Section 2; thence North 20' 32' 50" West along said right-of-way and the extension thereof a distance of 575.00 feet; thence North 69' 27' 10" East a distance of 30.00 feet to intersect said Northeasterly right-of-way line of U.S. Highways No. 10, 52 and 169; thence North 20' 52' 50" West along said right-of-way a distance of ,577.74 feet to the actual point of beginning of the land to be described; thence North 57' 15' 51" East a distance of 200.00 feet; thence North O' 11' 54" West a distance of 158.16 feet more or less to an intersection with the South line of the North 100.00 feet of said Southwest Quarter of the Southwest Quarter of Section 2; thence South 89' 48' 26" West along said South line of the North 100.00 feet, o distance of 259.77 feet to ar. intersection with said Northeasterly right-of-way line of U.S. Highways No. 10, 52 and 169; thence South 20' 32' 50" Ecst, along said right-of-way, a distance of 262.11 feet to the point of beginning. For the purpose of this description the South line of said Southwest Quarter is assumed to bear North 89' 57' 25" East. Containing 1.00 acres more or less. Subject to easements of record. s :\document\ocdinance\/zc96 - 17.d,..c SEC. 2 I. 52 722.,~g' 7~- 002- ,,~402 7~-002- 75-0~2-,,1315 -0220 ?5-002-3320 ~50.00' VEYORS OFFICE ATIOK JDING GI~PHIC SCAL~ ( m ~17 )