Crown Thinning and Deadwood Removal at Schiller Park

Perform crown thinning and deadwood removal for 25 mature oak trees in Schiller Park using only battery-powered equipment to minimize noise and environmental impact. All work must be completed within 3 weeks.

Steps

1 / 9 | Initial site assessment and tree health evaluation by Heinrich and Sophia

Heinrich Schmidt (Owner and Master Arborist) and Sophia Müller (Arborist) are conducting a comprehensive assessment of the 25 mature oak trees in Schiller Park. They're methodically examining each tree from ground level, looking for signs of disease, pest infestation, structural weakness, and deadwood. Heinrich is using a mallet to perform acoustic testing on suspicious areas of the trunks, listening for hollow sounds that might indicate internal decay. Sophia is taking detailed notes on a specialized tree assessment form, recording observations about each tree's overall health, specific problem areas, priority rating for work needed, and estimated time required. They're also using binoculars to examine the upper canopies for signs of stress or dead branches. Heinrich occasionally points out subtle indicators of tree health issues to Sophia, such as fungal fruiting bodies at the base of one tree and early signs of oak processionary moth on another. They're discussing the appropriate level of thinning for each tree based on its specific condition and location within the park. They're also taking photographs of each tree with a tablet for documentation purposes and marking each assessed tree with a small, temporary numbered tag to match their assessment forms.

2 / 9 | Set up safety perimeters and public information signage for each work zone

This task involves establishing clear safety perimeters around the oak trees being worked on in Schiller Park to protect the public from falling debris and to create a safe working environment for the arborists. The team is setting up physical barriers (barrier tape, cones, and portable fencing) to cordon off the work zone, with a minimum radius of 1.5 times the height of each tree. They're installing professionally printed information signs explaining the nature of the work, its ecological benefits, expected duration, and contact information for the Berlin Parks Department. Thomas is leading this operation, ensuring that all potential drop zones are completely sealed off while still allowing park visitors to navigate around them safely. Each perimeter has designated entry/exit points for workers only, and the team is strategically positioning signs where they'll be most visible to approaching pedestrians from all directions. This careful setup is critical since they're working in an active public park with regular foot traffic.

3 / 9 | Climber Preparation and Gear Check Before Ascending Each Tree

Before each climber ascends a tree, they conduct a thorough safety check of all climbing and cutting equipment. Heinrich supervises as Sophia and Jonas lay out their personal protective equipment (PPE) and climbing gear on a tarp for inspection. Each harness is examined for fraying or damaged stitching, carabiners are checked for proper locking function, and rope integrity is verified along its entire length. The battery-powered chainsaws receive special attention - battery charge levels are confirmed, chain tension is adjusted, and bar oil reservoirs are filled. Sophia demonstrates the proper technique for testing the chain brake function by activating it with her left wrist while the saw is running. Heinrich reminds everyone about the company's double-check policy where another team member must verify the primary attachment points before anyone leaves the ground. The climbers discuss their planned routes up each oak tree, identifying potential hazards like hidden deadwood or weak branches that might not support their weight. They also review hand signals to use with the ground crew during operations. Each climber then performs a detailed inspection of their specific climbing system - either doubled rope technique (DRT) or stationary rope technique (SRT) depending on the tree's structure. After the gear check, climbers put on their helmets, eye protection, cut-resistant pants, and appropriate footwear. Finally, a communication check is performed with the ground crew before the climbing begins.

4 / 9 | Systematic deadwood identification and removal starting from outer canopy

The arborists are performing systematic deadwood identification and removal on mature oak trees in Schiller Park. The climbers (primarily Sophia and Jonas, with occasional assistance from Lukas) are working their way methodically from the outer canopy inward, identifying branches that show signs of death or decay. They're using visual assessment techniques (looking for discoloration, lack of buds/foliage, fungal growth) and physical testing (gently pushing on suspicious branches to check rigidity). Dead branches are carefully cut using battery-powered chainsaws, following proper cutting techniques with clean, angled cuts to promote healing and prevent tearing. Larger branches are secured with ropes before cutting and lowered in a controlled manner to the ground crew through a designated drop zone. Smaller debris is dropped into cleared areas marked by the ground crew. The climbers are maintaining constant communication with the ground team using hand signals and occasional radio calls to coordinate branch lowering and to alert about falling debris. Each arborist is working on a separate section of the tree to maximize efficiency while maintaining safe working distances.

5 / 9 | Selective Crown Thinning of Mature Oak Trees in Schiller Park

The arborists are performing selective crown thinning on mature oak trees, carefully removing 15-20% of the live crown to improve air circulation and reduce wind resistance while preserving the tree's natural shape. Sophia and Jonas are positioned in the tree canopy using rope and harness systems, methodically working from the outer crown inward. They're making precise cuts with battery-powered chainsaws, focusing on removal of crossing, rubbing, and poorly attached branches. Each cut is made using the three-cut method to prevent bark tearing: an undercut first, followed by a top cut slightly offset from the undercut to remove the branch weight, then a final cut at the branch collar to promote proper healing. They're carefully maintaining branch spacing to ensure even distribution of foliage and avoiding lion's tailing (excessive removal of inner branches). Special attention is paid to preserving the tree's central leader and major scaffold branches. The workers are assessing each potential cut for its impact on the overall tree structure, health, and aesthetics. Lukas is supervising from the ground, providing guidance on which branches to prioritize for removal based on the tree's specific needs and the overall thinning goals.

6 / 9 | Controlled Lowering of Larger Branches to Ground Crew Using Ropes

The arborists are carefully removing large branches from the oak trees and systematically lowering them to the ground using rigging techniques. Lukas Weber is in the tree canopy, having secured himself with a climbing harness and multiple anchor points. He's methodically cutting larger branches (typically 10-20cm diameter) with his battery-powered chainsaw and attaching rigging ropes to them before making the final cut. Each branch is first assessed for weight, balance points, and potential hazards. Lukas communicates with the ground crew using hand signals and occasional verbal cues when necessary, announcing 'Cutting!' before making any cuts and 'Stand clear!' when a branch is about to be lowered. Thomas Klein and Jonas Becker form the ground team, with Thomas directing operations due to his experience despite his physical discomfort. They position themselves strategically outside the drop zone while maintaining tension on the rigging lines. As branches are lowered, they control the descent speed using friction devices (port-a-wraps) secured to nearby tree trunks. Once branches reach ground level, Jonas quickly disconnects the rigging ropes and begins processing the material while Thomas prepares for the next lowering operation.

7 / 9 | Ground Processing of Removed Material Including Brushing and Chipping

The ground crew, led by Thomas Klein, is processing the branches and deadwood that have been lowered from the oak trees. Jonas is dragging larger branches to the chipper while Thomas operates the battery-powered chipper, feeding in smaller branches and debris. They're systematically working through piles of material that have accumulated at the base of each tree. Sophia, who has just descended from the tree, is helping organize branches by size before processing. The team is separating usable firewood-sized logs from brush material. Thomas is carefully inspecting each branch before processing, removing any foreign objects like wire or nails that could damage the equipment. They're creating separate piles: one for immediate chipping, one for larger wood that requires cutting down to manageable sizes, and one for material that will be transported whole. The crew wears proper PPE including eye protection, hearing protection, gloves, and safety boots while working near the chipper. They maintain proper communication using hand signals when necessary due to noise levels.

8 / 9 | Daily Site Cleanup and Movement of Barriers to Next Work Zone

At the end of the workday, the team performs thorough site cleanup and repositions safety barriers to prepare for the next day's work area. This critical task ensures public safety and maintains a professional image with the Berlin Parks Department client. The crew collects all small branches, twigs, and leaf debris that have accumulated during the day's crown thinning and deadwood removal operations. They methodically rake the entire work area, ensuring no debris remains on paths or grassy areas. Wood chips from the chipper are either collected in bags or strategically distributed around tree bases according to park specifications. All tools are accounted for and either secured in the company vehicle or taken back to the workshop. Safety barriers, caution tape, and public information signs are carefully dismantled from the completed work zone, inspected for damage, and relocated to the next day's work area based on the predetermined project schedule. The team ensures that the next work zone is properly cordoned off before leaving the site, with appropriate signage informing the public about upcoming work.

9 / 9 | Final inspection of each tree and removal of all equipment and debris

This final phase involves a comprehensive post-work inspection of each oak tree to ensure all deadwood has been properly removed, crown thinning has been executed according to specifications, and no damage has occurred to the remaining branches. The team conducts methodical visual inspections from multiple angles, including from the ground and, when necessary, performing a final climb to check areas not visible from below. All temporary anchors, rigging points, and any equipment left in the trees are carefully removed. On the ground, team members thoroughly collect small branch fragments, sawdust, and any other work debris. Equipment is inventoried against the morning's checklist to ensure nothing is left behind. Documentation is completed with before/after photographs and detailed notes about each tree's condition and work performed, which will be included in the final report to the Berlin Parks Department. The park area around each tree is returned to pre-work conditions, with all safety cordons and signage completely removed only after the final approval from Heinrich or Lukas.