04 ATTACHMENT 6 - Laserfiche WebLink

Project No. E9164-04-0 2 - 1 - April 15, 2020 UPDATE GEOTECHNICAL INVESTIGATION 1. PURPOSE AND SCOPE This report presents the results of an update geotechnical investigation for the planned new Resurrection Greek Orthodox Church at 11300 Dublin Canyon Road in Pleasanton, California (see Vicinity Map, Figure 1). The purpose of this investigation was to evaluate the subsurface soil and geologic conditions in the area of planned development and provide conclusions and recommendations pertaining to the geotechnical aspects of project design and construction, based on the conditions encountered during our study. The scope of this investigation included field exploration, laboratory testing, engineering analysis and the preparation of this report. Our field exploration was performed on October 28, 2019 and January 27, 2020 included seven exploratory borings drilled to depths ranging between approximately 10 and 24 ½ feet below the existing ground surface. The locations of the soil borings are depicted on the Site Plan, Figure 2. A detailed discussion of our field investigation and soil boring logs are presented in Appendix A. Laboratory tests were performed on selected soil samples obtained during the investigation to evaluate pertinent geotechnical parameters. Appendix B presents the laboratory test results in tabular format and graphical format. Soil boring logs and laboratory testing from a previous study by others are included in Appendix C. The opinions expressed herein are based on analysis of the data obtained during the investigation and our experience with similar soil and geologic conditions. References reviewed to prepare this report are provided in the List of References section. If project details vary significantly from those described herein, Geocon should be contacted to determine the necessity for review and possible revision of this report. 2. SITE CONDITIONS AND PROJECT DESCRIPTION The site is a portion of a larger 16 ¼-acre parcel (Alameda County APN 941-1600-7-3) that includes Pleasanton View Church of Christ. The southern portion of that 16 ¼ parcel will be developed as a new Resurrection Greek Orthodox Church. The approximately 4 ¼-acre site is generally located between Dublin Creek and Dublin Canyon Road. Existing single-family residential development is present to the west. The site is generally vacant with no visible improvements aside from perimeter fencing. Topographically, the portion of the site to be developed is relatively flat and slopes gently from a high of approximately 430 feet MSL at the western end to approximately 425 feet MSL, based on web-based aerial imagery and mapping. Topography descends to the Dublin Creek drainage at the northern and eastern margins of the site. Site-specific topographic information was not provided; we estimate Dublin Creek is approximately 20 feet below the balance of the site. Based on the preliminary development plans provided by the project architects, , we understand a 10,000-square foot, 350-seat at-grade church building and a larger, two-story at-grade building with gymnasium are proposed at the western end of the site. The two-story building will be used for community, administrative and religious educational purposes. At-grade parking and driveways are planned throughout the site. Vehicular access will be via two driveways off Dublin Canyon Road. Ancillary site improvements such as new underground utilities and landscaping are also expected. Grading plans were not available at the time of this report. We have assumed cuts and fills to establish design subgrade elevations will be approximately 3 feet or less. Structural plans were also not available at the time of this report. We anticipate the new church and ancillary two-story building will utilize conventional shallow foundations (footings) and slab-on-grade for foundation support.