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Preliminary Arborist Report 536 St. John Street Pleasanton, CA Introduction and Overview Catalyst Development Group is planning to redevelop the site at 536 St. John Street in Pleasanton, CA. We included three lots in the assessment: a vacant lot, a lot with a single family home and a lot with a garage. Hort Science, Inc. was asked to prepare a Preliminary Arborist Report for the site as part of the development application to the City of Pleasanton. This report provides the following information: 1. An evaluation of the health and structural condition of the trees within the proposed project area based on a visual inspection from the ground. 2. An assessment of the development impacts to the trees based on the drawings provided by the client. 3. An appraisal of value of the trees according to the procedures described in the Guide for Plant Appraisal (Council of Tree and Landscape Appraisers). 4. Guidelines for tree preservation during the design, construction and maintenance phases of development. Assessment Methods Trees were assessed on and June 6 and 13, 2016. The assessment included all trees within and adjacent to the site measuring 6" and greater in diameter. The assessment procedure consisted of the following steps: 1. Identifying the tree as to species; 2. Tagging each tree with a numerically coded metal tag and recording its location on a map; 3. Measuring the trunk diameter at a point 54" above grade; 4. Evaluating the health and structural condition using a scale of 1 — 5: 5 - A healthy, vigorous tree, reasonably free of signs and symptoms of disease, with good structure and form typical of the species. 4 - Tree with slight decline in vigor, small amount of twig dieback, minor structural defects that could be corrected. 3 - Tree with moderate vigor, moderate twig and small branch dieback, thinning of crown, poor leaf color, moderate structural defects that might be mitigated with regular care. 2 - Tree in decline, epicormic growth, extensive dieback of medium to large branches, significant structural defects that cannot be abated. 1 - Tree in severe decline, dieback of scaffold branches and /or trunk; most of foliage from epicormics; extensive structural defects that cannot be abated. 0 - Dead 5. Rating the suitability for preservation as "high ", "moderate" or "low ". Suitability for preservation considers the health, age and structural condition of the tree species, and its potential to remain an asset to the site. High: Trees with good health and structural stability that have the potential for longevity at the site. Moderate: Trees with somewhat declining health and/or structural defects than can be abated with treatment. The tree will require more intense management and monitoring, and may have shorter life span than those in 'high' category.