1600 MADISON ST 2016-01-01 MF Import

Mr. Chris Lark Febniary 20, 2001 high rockery will be constructed along Beverly Boulevazd to provide grade separation with the completed facility. This grading may result in a net export of material from the site. 3.0 SUBSURFACE EXPLORATIONS Subswface conditions at the site were evaluated based on the results of existing borings that were previously drilled at [he srte in conjunction with an environmental investigation of potential contaminants that may have been released from exisring underground fuel storage tanlcs (USTs). This existing data was supplemented with geotechnical and environmental borings and laboratory tests performed specifically for the design of the new fire station. The following summazizes the procedures used to advance the borings of our current study and preveous studies at the site. 3.1 CURRENT EXPLORATIONS The field exploration program for the replacement fire station consisted of drilling seven borings (BH-1 through BH-7) at the site at the approximate locations indicated on Figure 2. The borings were drilled to depths ranging from 6 fe�t to as much as 60 feet below the existing ground surface. Groundwater monitoring wells were installed in the two deepest borings, borings BH-6 and BH-7, which were drilled to depths of 50 and 60 feet, respectively, below the existing ground surface. These borings were advanced to this relatively deep depth to provide information that would be used by G-Logics to investigate the potential presence and/or migration of contaminants at the former location of an UST. The drilling, which was completed on October 23 and 24, 200Q was conducted by Cascade Drilling of Woodinville, Washington, under a subconhact to G-Logics. Personnel &om PanGEO and G-Logics were present tluoughout the field exploration program to observe the borings, assist in sampling, and to prepaze descriptive logs of the explorations. The methods of exploration and summary logs of these borings ue included in Appendix A. 3.2 LABORATORY TESTING Soil samples obtained from the explorations were classified in the field and representative poRions were placed in airtight plastic bags and returned to our office for laboratory testing. Laboratory tests performed on selected samples included natural moisture content detertninations (ASTM D 2216) and grain size distributions (ASTM D 422). The laboratory tests were conducted by ROSA Envirunmental and Geotechnical Laboratory of Seattle, Washingtor,, under a subcontract to PanGEO. The tests were performed in general accordance with the procedures outlined in ASTM. The moisture content test results aze indicated on the summary boring logs in Appendix A, and the grain size distribution test results are included in Appendix B. 00-046-100 Geotech Report 2 PanGEO, Inc.