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0 0 <br /> soil, even minimum excavation for a typical installation is likely to require significant root <br /> pruning. Additionally,compaction reduces the amount of pore space in soil that acts as a water <br /> and oxygen reservoir for roots,which can affect tree health following construction. I do not <br /> recommend excavation or compaction of native soil on this site. <br /> According to Tim Ward, the parking lots must have permeable paving. Modifications that do <br /> not require compaction or excavation will help preserve the trees while meeting the hardscape <br /> requirements. If feasible,consider placing geotextile fabrics on the existing grade and building <br /> the paving on top of the fabric. Omitting a reservoir may also reduce the amount of materials <br /> on top of the roots. I recommend the architects and arborist have a discussion to determine <br /> alternatives that would meet the permeability requirement with minimum impact to the trees. <br /> Sincerely, <br /> Jennifer Tso <br /> Certified Arborist#W E-10270A <br /> Jennifer Tso, ISA Certified Arborist 2 <br /> 10 <br />