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Preliminary Tree Report, 3459 Foothill Rd., Pleasanton April 2, 2004 HortScience, Inc. Page 6 Preliminary Evaluation of Impacts and Recommendations for Preservation Appropriate tree retention develops a practical match between the location and intensity of construction activities and the quality and health of trees. The Tree Survey was the reference point for tree condition and quality. Potential impacts from construction were evaluated using the conceptual site plan map provided by Lamb Surveying, Inc. (September, 2003). Two alternative lot layouts are proposed (Fig. 5). In alternative A eight lots extend from a central road along the northern swale. It includes grading of a portion of the site, installation of a road and construction of new homes and related infrastructure. The existing house and vegetation on Lot 7 would remain as is. In alternative B eight lots are located along the southern property line. It includes grading of a portion of the site, installation of a road and construction of new homes and related infrastructure. Both designs retain much of the property in open space, to be dedicated to the City of Pleasanton. , Fig. 5: Site map indicating design alternatives A and B. Specific impacts from construction could not be estimated for each tree at this time, as site plans are conceptual. However, we were able to assemble a table (Table 3) outlining which trees could be impacted by the two conceptual designs, tree suitability for preservation, heritage status and a preliminary recommendation based on tree condition. Tabl. ~te.vea's that OPlio~ A (~~~\~~!~O tr?,~ 9p \\1\ n W~I\I. fl\1\~ntially imp~lit a \9l\l19f ~1 trees. Ofthose,9are'hentage trees. ~p\lon B could potentially Impact 11 trees, 90fwtuch are heritage (Table 4). Although the two designs could potentially impact the same number of heritage trees, option A could impact more than twice the number heritage trees with good suitability for preservation as compared to option B.