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HomeMy WebLinkAboutTree Service Z)40 RESOLUTION NO. 84 49 OF THE TRUCKEE DONNER PUBLIC UTILITY DISTRICT APPROVING SPECIFICATIONS AND CALLING FOR .� TREE TRIMMING PROPOSALS WHEREAS, it is the desire of the District to obtain qualified per- sonnel and operationally reliable equipment on a contract basis to trim, cut and dispose of trees and brush on power line rights-of-way and along and under the District's distribution and transmission lines; NOW, THEREFORE, BE IT RESOLVED by the Board of Directors of the Truckee Donner Public Utility District as follows: 1. That the specifications for tree work attached hereto are hereby approved. 2. That the President of the Board of Directors is hereby directed to issue a call for proposals based on the attached specifications. 3. That the date and time established for the bid opening is , 1984, at 4:00 P.M. PASSED AND ADOPTED by the Board of Directors of the Truckee Donner Public Utility District at a regular meeting thereof duly called and held in the District on the 6th day of August 1984, by the fol- lowing roll call vote: AYES: Cooley, Corbett, Duffy, Hamilton and Maass. NOES: None. ABSENT: None. TRUCKEE DONNER PUBLIC UTILITY DISTRICT By N -TAifies A. Maass, President ATTEST: Susan M. Craig, Deputy Distri t Clerk JIL12 SPECIFICATIONS TREE WORK 1. SCOPE OF BID .� The purpose of this specification is to obtain qualified personnel and op- erationally reliable equipment on a contract basis to trim, cut and dispose of trees and brush on power line rights-of-way and along and under the Dis- trict's distribution and transmission lines, as directed by the District's designated representative. 2. LOCATION OF WORK All work will be at various locations throughtout the Truckee Donner Public Utility District. 3. CREW SIZE AND EQUIPMENT For the purpose of evaluation, a crew shall consist of : A Foreman, a Tree Trimmer, and a Head Groundman (Chipperman) ; and their equipment shall include an operationally reliable lift truck, constructed and completely equipped for tree trimming, with a minimum ground-to basket height of fifty feet. Aerial lift trucks shall have over-center type upper booms with 360 degrees contin- uous rotation. This truck shall be equipped with one gasoline-powered chain saw. Also included shall be an operationally reliable dump-type, chip haul truck which is to tow an operationally reliable chipper. This chip haul (dump type) truck and chipper shall be considered as one unit and shall be billed only for actual hours used on the job as determined by the District's authorized repre- sentative. _ The Contractor shall provide sufficient crews to meet the District's require- ments. Contractor will be provided five working days' notice of the District's need to utilize additional crews. Crew structure shall be as authorized by the District's representative. The Contractor shall provide Flagmen as required to meet existing laws. 4. CUSTOMER RELATIONS It is understood that the Contractor does not represent the District and has no authority to obligate the District for any payment or benefit of any kind to any person. 5. BIDDING AND QUANTITY OF WORK The total amount of work to be done under this contract shall be as noted in the Special Conditions to this contract. No work may be done under this con- tract after the termination date established in the Special Conditions. y The labor and equipment costs which make up the Total for Proposal Comparison and the alternate personnel and alternate equipment costs shall include: (1) All mobilization and demobilization costs of the Contractor's plant, forces and equipment including mobilization and demobilization required by suspen- sions of work; (2) all operational and labor costs for fuel and fueling, oil, grease and maintenance upkeep and repairs to the equipment; (3) all taxes �^ (except sales tax) , deductions, overhead and profit. In most instances there will be no sales tax; however, sales tax will be paid on such work as required. The Contractor must provide separate invoices for all taxable work. Approval by the District's representative will be required for any daily pay- ment in excess of eight hours. Except for the payment of the prevailing wages and working condition benefits as set forth in the General Conditions and such other specific provisions set forth in the contract documents which apply to the work, the Contractor shall be re- sponsible for following the working rules of his agreement with his employees and his unit prices shall so provide. Bidders shall furnish the following information: 5. 1 Detailed description of manlift truck to include - a) Manufacturer, model, year, and size of truck b) Manufacturer and type of other equipment c) Maximum height from ground to bottom of basket d) Maximum reach from ground with air power trim saw e) Air pressure carried? f) Outriggers required? g) Type of power for ladder and compressor operation (P.T.O.? Separate engine?) 5.2 Chip haul (dump type) truck and chipper - a) Manufacturer, make, year, and size of truck b) Capacity of chipper bed c) Hydraulic dump? d) Manufacturer, model, year, and size of chipper 5.3 Other equipment furnished on the job 5.4 Name and experience of proposed Foremen and Tree Trimmers 5.5 List of other utility companies where now operating similar crews and equipment 5.6 Name and experience of Supervisor who will be responsible for crews under this contract 5.7 Date Contractor will be available to start work 5.8 List of other information which may be pertinent -2- aye 6. GENERAL All tree work shall be done so as to obtain maximum clearance with due regard to current and future tree health and symmetry, and in conformity with permis- sions obtained. It is understood that the electric circuits of the District are to continue in normal operation during this work, and the Contractor is to provide and use all protective equipment necessary for protection of his employees and to guard against interfering with the normal operations of said circuits. Contractor agrees to secure from the District information as to the nature of the cir- cuits involved in all cases before work is commenced. All vehicles used under this work shall be equipped and marked to meet all rules and regulations of the State of California, and all personnel shall be trained and qualified as may be required by the State of California. All work and equipment shall meet all OSHA requirements. The Contractor's supervising representative shall become acquainted with the District's work practices and procedures prior to commencing work. All brush, chips and cut material shall be disposed of by hauling away and dumping in areas designated or appropriate for disposal. The work area must be left clear of any debris. -3- T R E E T R I M M I N G G U I D E L I N E S 1.o TRIMMING AND REMOVAL GUIDELINES The two main purposes for trimming trees are to deter someone climbing the �^ tree and contacting high voltage lines, and to prevent tree/conductor con- tact that may initiate forest fires or affect service reliability. This must be kept in mind at all times when considering whether a tree requires trimming and the type of trimming necessary. i 1.1 Minimum Clearance Guidelines The following are the minimum clearance guidelines that should be main- tained between the conductor or energized part and all portions of the tree. Remember, the tree should be sufficiently trimmed beyond these clearan- ces to not require additional cutting for at least two years. Deciduous trees generally grow faster and require more trimming than evergreens. a . Radial clearance for any secondary conductor energized less than 600 volts to ground or bare neutral conductor . . . . 2 feet. b. Radial clearance for any conductor energized line to line voltage of 2,400 volts but less than 55.,000 volts . . . . 4 feet. C. Radial clearance for any conductor energized line to line voltage of 55,000 volts but less than 130,000 volts . . . . 6 feet. d. Radial clearance for any conductor energized line to line voltage of 130,000 volts but less than 250,000 volts . . . . 10 feet. e. Radial clearance for any conductor energized line to line voltage greater than 250;000 volts . . . . 15 feet. Any exceptions to these clearance guidelines must be approved by the authorized TDPUID supervisor. 1.2 Trees Under Line - Remove or Top Trees directly under the line or whose trunks are within the following distances from the outermost conductor should be removed or topped: 4 feet (2,400 volts to less than 55,000 volts) 6 feet (55,000 volts to less than 130,000 volts) 10 feet (130,000 volts to less than 250,000 volts) 15 feet (greater than 250,000 volts) �877 .�- Small young trees within the above boundaries should be removed if practicable. Trees that cannot be removed should be topped, not side trimmed, to the clearances specified in the guidelines. Whenever possible, trees should be trimmed to maintain their charac- teristic shape. 1.3 Trees Away from Line - Side Trim Trees further away from the line than the boundaries shown in the guidelines should be side trimmed to the guideline specifications. Consideration should -be given to removing limbs above the conductor to deter someone falling into the line. Flexible limbs that some- one might swing on or that may otherwise come in contact with the line should also be removed. 1.4 Trimming to Deter Climbing Any tree that presents conductor/contact safety hazards may require removal of the limbs from at least ten feet above the ground to de- ter climbing. Watch for buildings or walls that might provide access into the tree. Remove all necessary limbs to deter climbing in these cases. 1.5 Dead Trees and Limbs Dead or diseased trees and limbs that may break and fall into the line should be removed. 1.6 Pruning Compound Pruning compound shall be used to retard sucker growth, deter in- sects, and prevent infections when required. r is TOP TREE IF MAIN TRUNK IS WITHIN RADIAL CLEARANCE �!��-�►/�� RADIAL CLEARANCE �,•• 1 • SI , TRIM SUFFICIENTLY OEYOND CLEARANCES FOR AT LEAST 2 YEARS GROWTH (, .; ti -- � •fit• ..+�,.. IL BEFORE AFTER TREES UNDER LINES - TOP OR REMOVE "D? TO C-EARANCE REMOVE IF PRAcrICAOLE _ l r . \ SMALL YOUNG L<' TREES DEFORE AFTER REMOVE FLEXIBLE AND _ DE AO LIMBS ABOVE CIFMANCC ZONE THAT MAY CONTACT LINE., OAANCNE3 i REMOVED - f TO TREE ` I TRUNK. i _I 1 I TRUNK 013TANCE GREATER THAN RADIAL DIST- ANCE BEFORE AFTER TREES AWAY FROM LINE - SIDE TRIM j I MAINTAIN RADIAL DISTANCE REMOVE ALL BRANCHES 1 THAT MAY PROVIDE ACCESS INTO TREE 1 i 1 / REMOVE ALL BRANCHES 10 I IOr FROM GAO. TO DETER CU USING. I I BEFORE AFTER / POWER LINES SURROUNDED BY A LARGE NUMBER OF TREES . i �► MMN TRUNK M WITHIN I i CLEARANCE ZONE e� '0 L� REMOVE ALL DRANCHES 10 REMOVE All BRANCHES TO DETER I IN RADIAL CLEARANCE CLIMBING. - TREE TRUNK MUST FI'! To STRONG ENOUGH TO J`( RESIST SWAYING INTO LINES I I) II 1 I I END VIEW DETAIL EXCEPTION FOR EXISTING TREES AND FACILITIES -- o25g F RUCTIONS FOR OUTLYING AREAS eas away from man's influence (deserts, forests, canyons, etc. ) , it is tial that as little flora as possible be disturbed. Leave ground cover ched, except when "feathering" greatly improves appearances, or when ing around poles to prevent fires. a OAa V � ), — � � k �~^ � ^ter�y....v 4 Feathered edges of R/W. ,- On hillsides and in canyons, remove trees which might fall or slide into the line, a pole, or a structure. Only the uphill side shall be disturbed. Leave trees and brush on the downhill side; they will not inter-fere with the line. It is especially important that all brush and ground cover be left on the uphill side of poles and structures. Removal could result in erosion, which is to be avoided. 3.0 INSTRUCTIONS FOR TRIMMING AROUND TRANSMISSION LINES In construction of large transmission corridors, there are several methods for disguising the existence of the corridor. When a corridor crosses a well defined boundary between timber and clearing or between timber and a road, only those trees which directly interfere with the structures or lines should be tr=-nmed or removed. Brush, shrubs, saplings, and grass should be left in the corridor opening. In addition, access roads should be cut diagonally to the direction of the corridor in order to prevent the appearance of a long swath through the trees. Cod AA Transmission corridor crossing a road. AL Channelized transmission corridor - avoid. The "channeled effects" should be avoided; instead, the right-of-way should follow the terrain. On a flat, the corridor should reach its greatest width, while in steeper areas it should become more narrow. As a general rule, the corridor should not stay the same width for more than a few hundred feet; curving or scalloping the edges is much less unsightly. n� r) Curved and scalloped corridor - preferred. a�4' 4.0 MINIMUM WORKING DISTANCE During the tree trimming process, all safe minimum working distances for energized conductors shall be observed Voltage Range Phase to Phase * Minimum Working Kilovolt Distance 2. 1 to 15 2 ft. 15.1 to 35 2 ft. 4 in. 35.1 to 46 2 ft. 6 in. 46.1 to 72.5 3 ft. 72.6 to 121 3 ft. 4 in. 138 to 145 3 ft. 6 in. 161 to 169 3 ft. 8 in. 230 to 242 5 ft. 345 to 362 7 ft. 500 to 552 15 ft. *No conductive object, except with approved devices shall be taken any closer to unprotected energized circuits than the distance shown in the table.