Agmt12 TRA Environmental Sciences, Inc. MIG/TRA Environmental Services Inc.

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Exploratory Borinps will be drilled and logged. Three exploratory borings shall be sampled at the project site using conventional truck- or track-mounted hollow-stem auger drilling equipment. Although the footprint of the improvements is relatively small, two additional borings in the area of the tank shall be performed because of differing subsurface conditions may be present. The third boring will be taken at the site of the new pump station. The exploratory borings are described in more detail in Attachment A. Utilitv Clearance: Consultant shall mark the boring location at least two working days prior to beginning the explorations as required by law, and notify the regional utility notification center—Underground Service Alert. Permits. Site Access and Disposal of Drill Spoils: Consultant's explorations will be permitted and backfilled in accordance with the County of San Mateo County Environmental Health Guidelines. At the direction of the City, drill spoils shall be left on site. Laboratory Testing: Consultant shall provide for evaluation of the index and engineering properties of site soils, and conduct the following laboratory tests: • In-Situ Moisture/Density tests, American Society of Testing and Materials (ASTM) D2937 Test Procedure; • Grain size distribution tests, ASTM D1140; • Atterberg Limit tests, ASTM D4318 • Corrosion tests � • R-Value, Calatrans Test 301; • Undrained Unconsolidated T riaxial Tests, ASTM D2850 • Consotidation Test, ASTM D2435 Engineering Analysis and Report Preparation: Consultant shall focus the engineering analysis phase of work on evaluating potential impacts to site development, developing site grading recommendations and geotechnical design parameters for foundations and retaining structures. The data obtained from the site reconnaissance, aerial photo review, field investigation, laboratory testing, and review of available geologic information will be utilized in the engineering analysis. Following completion of the engineering analysis, a report shall be prepared that includes findings, conclusions and recommendations. The report shall include a site plan showing exploratory boring locations, boring logs, laboratory test results and a detailed discussion of the findings and recommendations. The findings shall discuss site and subsurface conditions, and potential geologic impacts, site preparation and earthwork recommendations, foundation type and design recommendations and lateral earth pressures for retaining wall design. If relevant, the report shall include a graphic of potential geologic hazards. Consultant shall summarize the findings of the report in the Initial Study and provide complete responses to each of the Checklist questions. Geotechnical design and siting recommendations shall be presented as mitigation measures unless they have already been incorporated into the project design. The complete report shall be attached as an appendix to the Initial Study. G. Greenhouse Gas Emissions. The proposed project will generate greenhouse gas emissions (GHG) during project construction and operation (pump station energy use). Based on information provided by the City regarding construction duration and equipment needed, Consultant shall calculate GHG emissions from all aspects of project construction. Consultant shall also calculate project operation emissions primarily associated with the pump station, as well as from the City's estimate of routine inspection and maintenance of the water tank and ATTY/AGR/2012.073ffRA ENVIRONMENTAL SCIENCES,INC REV:06-05-12 VR Page 17 of 26