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1 From: To: Subject: Date: Attachments: Heather Scott Tully, Tania Fwd: Stalite Root Bridge Tuesday, November 17, :58:01 AM Stalite_Root_Bridge_brochure[1].pdf Begin forwarded message: From: "Chuck Friedrich" Date: November 12, 2015 at 2:04:28 PM EST To: Subject: Stalite Root Bridge Heather, see attached brochure and specifications. Root bridging using lightweight aggregates as a protective layer can be installed easily for tree preservation where paved parking lots, sidewalks, driveways or streets are constructed. Historic sites included White Oak Plantation (the Duke Mansion in Charlotte), UVA's historic American Ash Tree at the Peabody Library, and The Atlanta Botanical Gardens. Attached are pictures from a Davison, NC Tree, UVA and White Oak Plantation in Charlotte Thanks Chuck Chuck Friedrich, RLA, ASLA, GRP Carolina Stalite Company

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6 Root Bridging to Protect and Preserve Existing Trees and their Root Systems UVA Charlottesville, VA St. Albans Rd. Davidson, NC Stalite PermaTill Expanded Slate Root Bridge Features High compressive strength Evenly graded aggregates offer a stable, lightweight fill Porous aggregates enhance aeration for roots with additional surface area for root attachment (roots grow in 100% Stalite) Stalite CEC average is 26.9 me/100g for nutrient storage Reduces stormwater runoff Permeable, with 10% moisture retention Economical to transport Suitable for paving or turf: Specifications available Existing Tree Root Bridging Media Physical Properties Expanded Slate ¾" 100 % Duke Mansion Charlotte, NC Other Sustainable Horticultural Applications with Stalite PermaTill : Structural soils for urban trees Structural soils for turf areas and fire lanes Landscape soil additive for improving aeration and drainage Protecting roots from vole damage Green roof media Greenhouse and nursery production Bio-retention and rain garden media Pathways and decorative stone Geotechnical uses Permeable pavement

7 PREPARED BY UNDERWOOD TREE SERVICE, INC. Underwood Tree Service, Inc. P. O. Box 5787 Cary, NC (919) Client: Randall And Heather Lee Objective: 218 N. East St Raleigh, NC (919) Installation of Reverse Crown Concrete in existing Driveway, Removal of two trees, replace with healthy trees Tree Protection Plan: Provide a plan during constructions that will best maintain the health of the trees after construction is completed Limitation of Services: Below is a Visual Tree Assessment of the trees in question. No invasive or removal of soils for root inspection was made. Due to the slope and years of water draining over the current critical root zone, I would recommend a future root inspection be done on the remaining trees. Site Condition: Site Character: Trees are close to the foundation a house. The trees are growing next to gravel driveway. Some portion of concrete was poured at different times to prevent erosion. Gravel driveway shows signs of root compaction, Irrigation: no sprinkler system Recent site disturbance? Concrete poured center of Gravel driveway, unknown when poured. Drain pipe at top of gravel driveway, unknown when installed. 1

8 Tree 1 Species: Mulberry inches, DBH (diameter at breast height) Mulberry tree has large canopy growing over house. There is a limit amount of foliage over the gravel driveway. The majority of the canopy is over the house. The propose driveway is close to the root collar of this tree. Due to the proximity of the tree to the proposed Driveway it would detrimentally impact the health of the tree. I recommend removal of the tree. Mulberry tree root collar: damaged from previous motor traffic Large Mulberry Tree: tree is in the path of the driveway. Mulberry tree root collar 2

9 .Tree 2: Species: Maple, DBH: 13 inches, Description: Due to the surrounding canopy of tree next to the maple, the canopy is smaller is size compared to the diameter and height of the tree. This tree is not in the direct path of the driveway. Tree protection plan for this tree is follow., Minimize heavy equipment over the critical root zone (See photo page 6) Use Stalite aggregate or a similar porous aggregate as a base for the concrete driveway. The aggregate is specially engineered to be porous, which help keep the ground from becoming compacted. The porous material will allow oxygen to be available to the root system under the concrete. This system of using a porous aggregate will assist the roots maintaining and improving the vigor of the tree. This in turn will help ensure the health of the canopy. A minimum thickness of aggregate of 6 inches. Do not disturb the present root system, to protect the back of the tree from construction, Place 2 x4 x 6 wooden boards, every 4-6 six inches, standing them perpendicular to the ground. Tie the boards in place to prevent machinery from accidently bumping into the tree and damaging the bark of the tree. Maple : staying maple: staying 3

10 Tree 3: Elm tree:, Growing on the slope of the driveway. The canopy similar to the other trees have a large canopy growth over the house and yard. This tree is in good over health. This tree is not in the direct path of the driveway. Tree protection plan for this tree is follow., Minimize heavy equipment over the critical root zone (See photo page 6) Use Stalite aggregate or a similar porous aggregate as a base for the concrete driveway. The aggregate is specially engineered to be porous, which help keep the ground from becoming compacted. The porous material will allow oxygen to be available to the root system under the concrete. This system of using a porous aggregate will assist the roots maintaining and improving the vigor of the tree. A minimum thickness of aggregate of 6 inches. Do not disturb the present root system, to protect the back of the tree from construction, Place 2 x4 x 6 wooden boards, every 4-6 six inches, standing them perpendicular to the ground. Tie the boards in place to prevent machinery from accidently bumping into the tree and damaging the bark of the tree. With this plan in place, this will minimize any negative impact on the trees future growth and assist in maintaining the vigor and health of the tree. This plan is designed to be in accordance with the City of Raleigh Goals of maintaining the tree canopies within the city limits. Elm tree staying 4

11 Tree 4: Locust tree: This tree has a large cavity at the base. There are signs of roots rot which has the potential for tree to fall in high winds. Due to the lack of structural integrity from the cavity and the root rot I would recommend removal of this tree. This tree is a hazard to surround person and property. Locust: arrow point to rot Arrow points to dead root inside the cavity 5

12 Tree 5: Oak tree: This tree has large mature canopy. The drip line is approximately foot radius. At the base of the tree there are several large girdling roots. These roots, over time impend the flow of nutrients to canopy of the tree. There is signs of decay at the base of the tree. Use porous aggregate on the road under the drip line of this tree due to the proximity of the tree to the road. This plan will assist in maintaining good aeration and available water to the roots under the driveway. This tree protection plan will assist in maintaining the current health of the tree, thus achieving the goal of the city which is to maintain as much of the tree canopy within the city limits. Oak tree, large canopy.. Signs of decay 2 feet of ground level. Several roots are girdling base of tree 6

13 Aerial map: 218 N East Street is outline in red. The three red circles represent the approximate area of the drip zone, or critical root zone, of the three trees that are not to be cut down. The 1 st smaller circle is the oak, the 2 nd small circle is the maple and larger circle is the Elm TREE Protection Plan: Minimize amount of heavy equipment used to build the driveway in order not to compact the driveway further. Protect the bark of the tree from accidental damage from equipment by use 2x4x6 boards. Use Stalite aggregate or a similar porous aggregate formulate to retain oxygen under non porous surfaces. A minimum thickness of 6 inches. 7

14 Conclusion: I would recommend the removal of Trees: 1. (Mulberry Tree) The tree will be too close to the construction of the driveway. Recommend removal of tree 4, Locust tree. Due to evidence of rot on the side of the tree, a large cavity, and decayed root. This tree is a hazard to persons and property. Trees 2, Maple tree and Tree 3, Elm tree, Oak tree 5. These tree are far enough away from the direct impact of the driveway construction. By using a porous aggregate below the concrete driveway surface, this should allow sufficient oxygen for future root growth and avoid compaction of the soils. The goal is to maintain and improve the health of the root system. This in turn will help maintain the health of the canopy of the trees. All tree work and pruning will be done according to ANSI 300 stands of removal and pruning. Report was written by Robert L. Underwood, ISA Certified Arborist S0-5616A Robert L. Underwood, Underwood Tree Service, Inc. ISA Certified Arborist (919)