RFP #1112-05 Bid Specifications - City of Urbana

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Street and Public Property Tree Inventory and Tree Inventory Data Management Software City of Urbana Request for Proposals RFP #1112-05 Page 4 of 34 4. Stems—The number of stems on trunks splitting less than one foot above ground level is recorded. 5. Condition—The general condition of each tree is rated according to the following categories adapted from the International Society of Arboriculture’s rating system: Excellent 100% Good 80% Fair 60% Poor 40% Critical 20% Dead 0% 6. Primary Maintenance Need. The following primary maintenance needs will be determined based on ANSI A300 standard specifications: ‣ Removal. Trees designated for removal have defects that cannot be costeffectively or practically treated. The majority of the trees in this category have a large percentage of dead crown. All trees with safety risks that could be seen as potential threats to persons or property and seen as potential liabilities to the client would be in this category. Large dead and dying trees that are high liability risks as well as those that pose minimal liability to persons or property (such as trees in poor locations or undesirable species) will be identified in this category. Priority of work should depend upon the Risk associated with the individual trees. ‣ Large Tree Clean. These trees require selective removal of dead, dying, broken, and/or diseased wood to minimize potential risk. Priority of work should be dependent upon the Risk associated with the individual trees. Trees in this category are large enough to require bucket truck access or manual climbing. Includes trees above 45ft. ‣ Medium Tree Clean These trees require selective removal of dead, dying, broken, and/or diseased wood to minimize potential risk. Priority of work should be dependent upon the Risk associated with the individual trees. Trees in this category may require some manual climbing but are generally not large enough to reserve pruning for bucket truck access. Includes trees above 20ft and below 45ft. ‣ Small Tree Clean. These trees require selective removal of dead, dying, broken, and/or diseased wood to minimize potential risk. Priority of work should be dependent upon the Risk associated with the individual trees. These trees are small growing, mature trees that can be evaluated and pruned from the ground. ‣ Young Tree Train. These are young trees that must be pruned to correct or eliminate weak, interfering, or objectionable branches in order to minimize future maintenance requirements. These trees, up to 20 feet in height, can be worked with a pole pruner by a person standing on the ground.
Street and Public Property Tree Inventory and Tree Inventory Data Management Software City of Urbana Request for Proposals RFP #1112-05 Page 5 of 34 ‣ Stump Removal. This category indicates a stump that should be removed. any stump 4”or greater in diameter be specified for removal. ‣ Plant Tree. During the inventory, vacant planting sites will be identified by street, address and site number. The size of the site is designated as small, medium, or large (indicating the ultimate size that the tree will attain), depending on the growing space available and the presence of overhead wires. Planting sites are determined based on 40 foot spacing from existing trees, and minimums of 15 feet from driveway approaches and street lights, 75 feet from intersections, 35 feet from overhead electrical conductors/poles and 5 feet from all other utility structures. 7. Secondary Maintenance Need. The following secondary maintenance needs will be determined based on ANSI A300 standard specifications: ‣ Raise. Trees requiring pruning to remove low branches that interfere with vehicular, pedestrian or bicycle traffic and their respective site lines. The following clearance standards shall be used; 9 feet over sidewalks and public/park turf areas that need grounds maintenance equipment access, 16 feet over roads for Traffic clearance, and 10 feet over driveways and buildings. ‣ Reduce. Selective pruning to decrease height and/or spread of the crown in order to provide clearance for special needs such as electric utilities and lighting. ‣ Thin. The selective removal of water sprouts, epicormic branches, and live branches to reduce density. ‣ Utility. Selective pruning to prevent the loss of service, comply with mandated clearance laws, prevent damage to equipment, avoid access impairment, and uphold the intended usage of the facility/utility space. ‣ Restoration. Selective pruning to improve the structure, form, and appearance of trees that have been severely headed, vandalized, or damaged. ‣ None. No secondary maintenance is recommended for the tree. This will be used as the default value when Primary Maintenance equals Removal, Stump Removal, or Plant Tree. 8. Risk Assessment. A risk rating will be assigned using an assessment protocol based on the USDA Forest Service Community Tree Risk Rating System. ‣ Probability of Failure (1 – 4 points). Identifies the most likely failure and rates the likelihood that the structural defect(s) will result in failure based on observed, current conditions. ‣ Size of Defective Part (1 – 3 points). Rates the size of the part most likely to fail. If the trunk is the part most likely to fail, tree will recommended for removal and the DBH value will be used for the size of the defective part.
Page 1 and 2: Request Date 6/24/2012 CITY OF URBA
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RFP #1112-05 Bid Specifications - City of Urbana

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