SR 06:202 - Laserfiche WebLink

Test borings were performed in four locations within the proposed lotting area, and were drilled to 21 feet below the existing ground surface. The surface soil consists of dark brown silty clay that is very dry and stiff. Bclow the surface layer and at the depth of 13 feet and below, dark yellowish brown silty clay was encountered and that it is very moist to saturated and medium stiff to stiff. The field investigation did not observe any evidence oflandslides. The report stated that the site is suitable for the proposed development. Although no active faults have been mapped to cross the site, the site is located in the seismically active San Francisco Bay Area. As such, the investigation report included a list of recommendations in the area of grading (cut and fill), soil compaction, foundation, retaining walls, pavement sections, etc. Since the NEC report was prepared in 1999, it was peer reviewed by Alan Kropp & Associates, Inc. to ensure that the report conforms to generally accepted standards of practice. The peer review report finds that the geotechnical investigation report by NEC for the subject site generally conforms to those standards. However, the pcer reviewer recommends that, as the project progresses, the drainage issues should be thoroughly evaluated at the time of building permit for Lot 3. Proposed grading should consider high water content valves recorded on the boring lots, and that NEC should confirm that the 1999 recommendations are still applicable to the project now being proposed. Conditions of approval have been included to address these items. Tree Report and Biological Assessment Tree Report: A tree report was prepared by HortScience, evaluating the potential development impacts to trees that are located within the proposed development area. The report includes an evaluation of the tree health and structural conditions, and an appraisal of the trees that are to be preserved. If a tree were damagcd or destroyed due to construction activities, its value could be ascertained and fines levied. The tree report surveyed a total of eight (8) trees that are within the proposed development area. Among them, three are coast redwood trees, two are coast live oak trees, and three are California bay laurel trees. All of them are heritage-sized trees per City Tree Ordinance, and are in a fair to good condition. The report further assessed the trees' suitability for preservation. Two Coast redwoods (Tree Nos. 93 and 94) and two Coast live oaks (Trec Nos. 96 and 97) were assess to have good health and structural stability; therefore, they would have the potential for longevity at the site. One Coast redwood (Tree No. 95) and two California bay laurel trees (Tree Nos. 99 and 100) were assessed to have moderate heath and structural stability, and one California bay laurel (Tree No. 98) was assessed to have poor health and low structural stability for preservation. Case No. PUD-44 Planning Commission Page - 6 -